CN102065068A - Implementation method, system and equipment for emergency call - Google Patents

Abstract

The embodiment of the invention discloses a method, system and equipment for realizing an emergency call. The method includes: an emergency call processing device receives an emergency call request from an IP multimedia system IMS network access device, and acquires source address information of a fixed access terminal carried in the emergency call request; the emergency call processing device queries the The source address information of the fixed access terminal, to obtain the emergency call routing information corresponding to the fixed access terminal; the emergency call processing device adds the emergency call routing information to the emergency call request and sends it to the IMS network, The emergency call request is caused to be routed to an emergency call center. By using the embodiment of the present invention, when the network operator does not have the storage resource to connect the session location and the storage function, the emergency call of the fixed access terminal is realized.

Description

A method, system and device for implementing an emergency call

technical field

The present invention relates to the communication field, in particular to a method, system and equipment for realizing an emergency call.

Background technique

Emergency call service (Emergency Call Service) refers to emergency special services such as fire alarm, bandit police, medical first aid, and traffic accident alarm provided to users on the telecommunications network. The IMS (IP Multimedia Subsystem, IP Multimedia System) emergency call service supports fixed access terminals and mobile access terminals. One of the key points is to obtain user location information. The IMS core network completes emergency calls from the terminal to its location according to the obtained user location information. Center transfer.

In the prior art, the processing flow for an emergency call in a softswitch network is as follows: the location attribute of the call source is found by the BSC (Base Station Controller, base station controller), and the location attribute of the call source is sent to the end office, and the end office According to the location information of the call source, add the prefix or suffix of the emergency call number and send it to the gateway office, and the emergency call will be processed by the gateway office. If there is a direct link between China Mobile and the emergency call center, it will be sent directly to the emergency call center; if there is no direct link between China Mobile and the emergency call center, it will be transferred by other operators by signing an interoperability agreement with other operators. However, this method does not support the emergency call service of the fixed access terminal.

In the standard IMS network in the prior art, a network system structure diagram for realizing an emergency call is shown in FIG. 1 . Among them, the emergency call processing flow for fixed access terminals is:

When the terminal does not carry its own location information or the location information is incomplete, the SBC (Session Border Controller, session border controller)/P-CSCF (Proxy Call Serving Control Function, proxy call session control function) as an IMS access device needs to communicate with CLF (Connectivity Session Location and Repository Function, connection session location and storage function) interacts to obtain the complete location information of the terminal, and adds the location information of the terminal to the signaling and sends it to E-CSCF (Emergency-CSCF, emergency call session control function), and then the E-CSCF uses the location information to perform LRF (Location Retrieval Function, location acquisition function entity) query, obtain the routing information of the PSAP corresponding to the user's access location, and finally transfer the call to the PSAP (Public Safety Answering Point , Public Safety Response Point). When the target PSAP is not in the IMS network, the call is forwarded by the MGCF (Media Gateway Control Function, Media Gateway Control Function) to the CS (Circuit Switch, Circuit Switched) domain, and finally the call is completed. The problem existing in the prior art is that, when the network operator does not have the storage resource of the CLF, the emergency call of the fixed access terminal cannot be realized.

Contents of the invention

Embodiments of the present invention provide a method, system and device for implementing an emergency call, which are used to implement emergency calls for fixed access terminals when the network operator does not have storage resources for connecting session locations and storage functions.

Embodiments of the present invention provide a method for implementing an emergency call, including:

The emergency call processing device receives the emergency call request from the IP multimedia system IMS network access device, and obtains the source address information of the fixed access terminal carried in the emergency call request;

The emergency call processing device queries the source address information of the fixed access terminal, and obtains emergency call routing information corresponding to the fixed access terminal;

The emergency call processing device adds the emergency call routing information to the emergency call request and sends it to the IMS network, so that the emergency call request is routed to an emergency call center.

Wherein, before the emergency call processing device receives the emergency call request from the IP multimedia system IMS network access device, it also includes:

The IMS network access device receives the emergency call request sent by the fixed access terminal;

The IMS network access device verifies the emergency call request, and when the access network identifier PANI field of the emergency call request does not include the source address information and/or domain name information of the fixed access terminal, Complementing the source address information and IMS entry point domain name information of the fixed access terminal in the PANI field of the emergency call request;

The IMS network access device sends the emergency call request carrying the source address information of the fixed access terminal and the IMS entry point domain name information in the PANI domain to the emergency call processing device.

Wherein, after receiving the emergency call request sent by the fixed access terminal, the IMS network access device further includes:

The IMS network access device determines whether the fixed access terminal sending the emergency call request has registered;

When the fixed access terminal has been registered, continue; otherwise, determine whether emergency calls can be provided for unregistered fixed access terminals, and if the judgment result is yes, continue, otherwise require the fixed access terminal to initiate a registration process or refuse call.

Wherein, the emergency call processing device queries the source address information of the fixed access terminal, and obtains the emergency call routing information corresponding to the fixed access terminal, including:

The emergency call processing device sends the source address information of the fixed access terminal to a location acquisition function;

The location acquisition function queries the access location of the fixed access terminal in the preset corresponding relationship between the source address information of the fixed access terminal and the access location according to the source address information of the fixed access terminal; When the access location of the access terminal is fixed, further query the emergency call routing information corresponding to the access location in the preset corresponding relationship between the access location and the emergency number routing information and send it;

The emergency call processing device acquires the emergency call routing information corresponding to the fixed access terminal according to the response of the location acquisition function.

Among them, also include:

The location acquisition function notifies the emergency call processing device when the access location of the fixed access terminal is not found according to the source address information of the fixed access terminal;

The emergency call processing device compares the IMS entry point domain name information carried in the PANI field of the emergency call request with the accuracy of the subscription home access location of the fixed access terminal acquired from the home subscriber server HSS; and send the more accurate IMS entry point domain name information or the access location of the fixed access terminal to the location acquisition function;

The location acquisition function further queries the emergency call routing information corresponding to the access location in the preset corresponding relationship between the access location and the emergency number routing information, or in the corresponding relationship between the domain name and the emergency number routing information, and sends it;

The emergency call processing device acquires the emergency call routing information corresponding to the fixed access terminal according to the response of the location acquisition function.

Wherein, the emergency call processing device acquires the subscription location of the fixed access terminal from the HSS, including:

When the fixed access terminal session is initiated, the emergency call processing device acquires the access location information of the subscription of the fixed access terminal from the HSS through the Cx interface.

Embodiments of the present invention provide a system for implementing an emergency call, including:

The IMS network access device is configured to send an emergency call request to the emergency call processing device, the source address information of the fixed access terminal carried in the emergency call request;

The emergency call processing device is configured to obtain the source address information of the fixed access terminal carried in the emergency call request sent by the IMS network access device; query the source address information of the fixed access terminal to obtain the fixed access terminal Emergency call routing information corresponding to the terminal and adding the emergency call routing information to the emergency call request and sending it to the IMS network, so that the emergency call request is routed to the emergency call center;

The location acquisition function device is configured to query the emergency call routing information corresponding to the fixed access terminal according to the source address information of the fixed access terminal provided by the emergency call processing device, and provide it to the emergency call processing device.

An embodiment of the present invention provides a network device, including:

a communication unit, configured to receive an emergency call request from an IMS network access device;

An address obtaining unit, configured to obtain source address information of the fixed access terminal carried in the emergency call request received by the communication unit;

a routing information obtaining unit, configured to query the location obtaining function in the network for the source address information of the fixed access terminal obtained by the address obtaining unit, and obtain emergency call routing information corresponding to the fixed access terminal;

a routing information adding unit, configured to add the emergency call routing information obtained by the routing information obtaining unit to the emergency call request, and send the emergency call request to the IMS network through the communication unit, so that the emergency call request is routed to the emergency call request; Call Center.

Wherein, the routing information obtaining unit is also used for:

When the location obtaining function does not query the access location of the fixed access terminal according to the source address information of the fixed access terminal, comparing the IMS entry point domain name information carried in the PANI field of the emergency call request with the information of the IMS entry point domain name, and Accuracy of the access location where the subscription of the fixed access terminal is acquired from the HSS; and send more accurate IMS entry point domain name information or the access location of the fixed access terminal to the location An acquisition function: acquire emergency call routing information corresponding to the fixed access terminal according to the response of the location acquisition function.

Wherein, the routing information obtaining unit is further configured to obtain, from the HSS through the Cx interface, the access location information of the subscription of the fixed access terminal when the fixed access terminal session is initiated.

An embodiment of the present invention provides an IMS network access device, including:

An emergency call request receiving unit, configured to receive an emergency call request sent by a fixed access terminal;

The emergency call request processing unit is configured to send the emergency call request received by the emergency call request receiving unit to the emergency call processing device, and carry the source address information of the fixed access terminal in the emergency call request.

Wherein, the emergency call request processing unit is specifically used for:

Verifying the emergency call request received by the emergency call request receiving unit, when the access network identifier PANI field of the emergency call request does not include the source address information of the fixed access terminal and/or the IMS entry point domain name information , complete the source address information of the fixed access terminal and IMS entry point domain name information in the PANI field of the emergency call request and send it to the emergency call processing device.

Among them, also include:

An emergency call request checking unit, configured to determine whether the fixed access terminal sending the emergency call request has registered; when the fixed access terminal has registered, notify the emergency call request processing unit to process; otherwise, determine whether it can An emergency call is provided for an unregistered fixed access terminal, and if the judgment result is yes, the emergency call request processing unit is notified for processing; otherwise, the fixed access terminal is required to initiate a registration process or reject the call.

Wherein, the IMS network access device is a Session Border Controller SBC or a Proxy Call Session Control Function P-CSCF.

An embodiment of the present invention provides a location acquisition function device, including:

A communication unit, configured to receive the source address information of the fixed access terminal provided by the emergency call processing device, and send emergency call routing information corresponding to the fixed access terminal to the emergency call processing device;

The query unit is configured to query the emergency call routing information corresponding to the fixed access terminal according to the source address information of the fixed access terminal provided by the emergency call processing device.

Wherein, the communication unit is further configured to: notify the emergency call processing device when the query unit fails to query the access location of the fixed access terminal according to the source address information of the fixed access terminal;

The query unit is further configured to, according to the IMS entry point domain name information provided by the emergency call processing device, or the access location of the fixed access terminal, in the preset correspondence between the access location and the emergency number routing information , or the corresponding relationship between the domain name and the emergency number routing information, the emergency call routing information corresponding to the access location is queried.

Compared with the prior art, the present invention has the following advantages:

Receive the emergency call request from the IMS network access device, obtain the source address information of the fixed access terminal carried in the emergency call request; obtain the emergency call center routing information corresponding to the fixed access terminal according to the source address information, and make the emergency call Requests are routed to an emergency call center. Therefore, when the network operator does not have the storage resources to connect the session location and the storage function, the emergency call of the fixed access terminal is realized.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of an emergency call system of an IMS network in the prior art;

Fig. 2 is the implementation method flowchart of the emergency call provided by the embodiment of the present invention;

Fig. 3 is the emergency call flowchart when the user normally registers provided by the embodiment of the present invention;

Fig. 4 is the emergency call flowchart when the user is not registered provided by the embodiment of the present invention;

Fig. 5 is a flow chart of obtaining signed location information provided by an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a network device provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of an IMS network access device provided by an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a location acquisition function device provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Embodiments of the present invention provide a method for implementing an emergency call, as shown in Figure 2, including:

Step s201: Receive an emergency call request from an IMS network access device, and obtain source address information of a fixed access terminal carried in the emergency call request; the source address information may include IP address information and/or port information.

Step s202, querying the source address information of the fixed access terminal, and obtaining the emergency call center routing information corresponding to the fixed access terminal;

Step s203, adding the emergency call center routing information to the emergency call request and sending it to the IMS network, so that the emergency call request is routed to the emergency call center.

The implementation method of the emergency call provided in the embodiment of the present invention is described below in combination with specific network scenarios. In the current network, a key point of an emergency call is to obtain the location information of the fixed access terminal, so that the core network can transfer the emergency call from the fixed access terminal to the emergency call center corresponding to the location of the fixed access terminal.

In the implementation method of the emergency call provided by the present invention, the user location information uses the SIP (Session Initiation Protocol, Session Initiation Protocol) extended message header P-Access-Network-Info (abbreviated as PANI) to record and transmit. The PANI message header records the user IP address and port number, such as:

P-Access-Network-Info: "UE-IP=202.106.2.1"; "UE-Port=20000;"

That is, the IP address of the fixed access terminal is 202.106.2.1, and the port is 20000.

SBC can also insert IMS entry point domain name information in PANI, such as SBC domain name information, such as:

P-Access-Network-Info: "UE-IP=202.106.2.1"; "UE-Port=20000"; "SBC-domain=sbc1.010.bj.chinamobile.com;"

That is, the domain name of the SBC domain is sbc1.010.bj.chinamobile.com.

In the present invention, the emergency call process when the user normally registers is as shown in Figure 3, including:

In step s301 , the UE establishes an IP connection with the IMS through the IP-CAN, and has obtained the address of the access SBC, but the UE has not yet completed the registration.

Step s302, the UE completes the normal IMS registration process of returning to the domain;

Step s303, the UE initiates an Invite request for an emergency call, and the Request URI includes the emergency service number:

If EE can detect that it is an emergency call, the emergency call indicator "sos" needs to be carried in the request;

If the UE can provide the P-Access-Network-Info header field, the UE should write its own access information into the header field, including: UE access mode, IP address information, etc.;

Step s304, the accessing SBC receives the Invite request, processes the PANI header field and sends it to the local P-CSCF. specific:

When the UE access information is insufficient (no P-Access-Network-Info header field), according to the local division information, fill in the SBC domain name information and user source IP information in the P-Access-Network-Info header field (SBC can identified user public network IP information), and forward the Invite request to the local P-CSCF;

If the EE Invite request has a P-Access-Network-Info header field, the SBC identifies the UE's access location information, and fills in the SBC's domain name information and user source IP after the UE's own information in the P-Access-Network-Info header field information, and forward the Invite request to the local P-CSCF;

Step s305: After receiving the Invite request, the P-CSCF recognizes it as an emergency call, and the P-CSCF checks the integrity and validity of the P-Access-Network-Info header field. The accessed SBC information is responsible for completing the domain name information including the area code in the header field. In this embodiment, the SBC domain name is used, and the request is forwarded to the local E-CSCF; what needs to be explained here is that if the P-CSCF can complete the CLF Inquiry, after the P-CSCF inquires and obtains the user access information, fills the user access information into the P-Access-Network-Info header field, and forwards it to the local E-CSCF;

Step s306: After receiving the INVITE request, the E-CSCF extracts the user source IP information or user access information in the P-Access-Network-Info header field, and the emergency number in the Request URI, and initiates the user's emergency call routing to the LRF number inquiries;

Step s307, LRF inquires and obtains the specific location information of user access according to the user source IP information or user access information, and obtains the emergency call routing number in the area according to the user location and emergency number, and returns it to the E-CSCF;

When the IP address cannot be found, the E-CSCF first relies on the SBC domain name to obtain the default route; the E-CSCF downloads the user subscription location information from the HSS (Home Subscriber Server) through the extended Cx interface of this solution, so as to communicate with the SBC Domain name comparison, select more accurate access information to obtain routes. For scenarios where the user’s nomadic source IP is untrustworthy and other scenarios where the user’s access location cannot be accurately identified, the E-CSCF needs to be able to obtain the default emergency routing code based on the area code information in the SBC domain, and route the emergency call to the default emergency routing code of the SBC access location. Emergency call center.

E-CSCF cannot query the user's access location based on the user's source IP information in the PANI header field, and returns an error; (the IP list in the LRF may not be updated in time, or the user may access from an untrusted IP address of another operator)

E-CSCF continues to query the user's default emergency call routing code according to the SBC domain, and returns the default route;

The E-CSCF shall be able to initiate user subscription location query to the local HSS through the extended Cx interface. If the user subscription location can be queried, the format is "area code. prefecture city pinyin. district county pinyin", such as "010.beijing.chaoyang". Compare with the area code in the SBC domain, if the area code is the same, re-query the LRF to obtain the emergency call routing code according to the user's subscription location information; if the area code is different, the emergency call will be forwarded by the previously queried default route. Embodiments of the present invention do not limit the use of the above-mentioned format of "area code. city pinyin. district and county pinyin", and the user's subscription location can also be inquired by means of zip code, etc., such as initiating a user subscription location query to the local HSS, and the zip code is " 100047", and the zip code in the SBC domain is "100000", you can get the emergency call routing code according to the exact zip code "100047".

In the application scenario of the present invention, the corresponding relationship stored in the LRF includes: (1) the corresponding relationship between the source IP information and the access location, so as to query the source IP address of the fixed access terminal according to the source IP information of the fixed access terminal; (2) The corresponding relationship between the access location and the called emergency call routing information, so that when the location information of the fixed access terminal can be identified, the corresponding emergency call routing information can be queried; (3) SBC domain name and emergency call routing information Corresponding relationship, so that when the user access location information is not identifiable, the corresponding emergency call routing information can be obtained through the SBC domain name query.

Step s308, the E-CSCF receives the emergency call routing number, adds it to the Request URI of the Invite request, and forwards the request to the MGCF; for scenarios where the user's nomadic source IP is untrustworthy and other scenarios where the user access cannot be accurately identified, the E-CSCF The CSCF needs to be able to route the emergency call to the unified emergency call center at the SBC access location.

Step s309, after receiving the INVITE request, the MGCF routes the request to the GMSC where the called emergency center is located according to the called area code of the Request URI, and enters the PLMN network;

Step s310, the PLMN network connects to the local emergency call center according to the local emergency call routing, and the session is established.

The emergency call flow when the UE is not registered is shown in Figure 4.

Step s401, the user UE has established an IP connection with the IMS through IP-CAN, and has obtained the address of the access SBC, but the UE has not yet completed registration;

Step s402, the UE is not registered, and initiates an Invite request for an emergency call;

If the UE can detect that it is an emergency call, it needs to carry the emergency call indication "sos" in the request;

If the UE can provide the P-Access-Network-Info header field, the UE should write its own access information into the header field, including: UE access mode, source address information, etc.; add its own IP address in the Contact header field (can also contain sos instructions);

UE fills in the equipment identifier (equipment identifier) in the P-Prefered-Identity header field; adds its own IP address in the Contact header field.

Step s403, the SBC at the access location receives the Invite request and recognizes it as an unregistered emergency call, then the SBC performs the following analysis:

When UE access location information is insufficient (no P-Access-Network-Info header field), according to the local division information, fill in the SBC domain name information and user source IP information in the P-Access-Network-Info header field, and send This Invite request is forwarded to the local P-CSCF;

If the UE Invite request has a P-Access-Network-Info header field, the SBC identifies the UE's access location information, and fills in the SBC domain name information and user source IP after the UE's own information in the P-Access-Network-Info header field information, and forward the Invite request to the local P-CSCF;

Step s404: After receiving the Invite request, the P-CSCF recognizes it as an unregistered emergency call. If the access area does not allow unregistered calls, the UE needs to initiate a registration process; if the access network allows unregistered calls, it can provide unregistered calls. When registering for emergency services, the P-CSCF checks the P-Access-Network-Info header field. If there is no such header field, the P-CSCF is responsible for completing the SBC domain name including the area code in the header field information based on the accessed SBC information. , and forward this request to the local E-CSCF; if the P-CSCF can complete the CLF query, the P-CSCF will query and obtain the user access information, fill the user access information into the P-Access-Network-Info header field, and Forward to local E-CSCF

Step s405, after receiving the INVITE request, the E-CSCF extracts the user source IP information or user access information in the P-Access-Network-Info header field, and the emergency number in the Request URI, and initiates the user's emergency call routing to the LRF number inquiries;

Step s406, the LRF inquires the specific location information of the user access according to the source IP information of the user, and obtains the emergency call routing number in the area according to the user location and emergency number, and returns it to the E-CSCF;

Step s407, E-CSCF receives the emergency call routing number, adds it to Request URI, and forwards the request to MGCF;

Step s408, after receiving the INVITE request, the MGCF routes the request to the GMSC where the called emergency center is located according to the called area code of the Request URI, and enters the PLMN network;

Step s409, the PLMN network connects to the local emergency call center according to the local emergency call routing, and the session is established.

For fixed users, in non-nomadic scenarios, the E-CSCF can also directly download the subscription location information of the user corresponding to the user from the HSS through the Cx interface when the user registers. The subscription location information takes precedence over the extended access provided by the P-CSCF location information. The E-CSCF queries the LRF based on the subscription location information and the emergency call number obtained through user registration, analyzes and obtains the routing number of the emergency call center, and then routes the emergency call according to the routing number.

The user UE has established an IP connection with the IMS through IP-CAN, and has obtained the address of the access SBC, but the EE has not yet completed the registration. At this time, the UE initiates the registration process, and can obtain the subscription information at the same time when obtaining the user subscription information from the HSS. location information. The process is shown in Figure 5:

(1) The user initiates the registration process, sends the registration message to the SBC, and the SBC forwards the registration request to the visited P-CSCF;

(2) The P-CSCF forwards the registration request to the user's home I-CSCF. After the I-CSCF allocates the S-CSCF for the user, the S-CSCF downloads the user authentication information from the HSS and completes the subsequent UE authentication and authentication process.

(3) After completing the authentication, the S-CSCF acquires user subscription information from the HSS.

(4) The HSS returns the subscription information of the user to the S-CSCF, and obtains the subscription location information of the user at the same time.

E-CSCF cannot query the user's access location based on the user's source IP information in the PANI header field, and returns an error; (the IP list in the LRF may not be updated in time, or the user may access from an untrusted IP address of another operator)

E-CSCF continues to query the user's default emergency call routing code according to the SBC domain name, and returns the default route;

The E-CSCF can initiate a user subscription location query to the local HSS through the extended Cx interface. If the user subscription location can be queried, the format is "area code. prefecture city pinyin. district county pinyin", such as "010.beijing.chaoyang". Compare the area codes in the SBC domain. If the area codes are the same, re-query the LRF to obtain the emergency call routing code according to the user's subscription location information; if the area codes are different, the emergency call will be forwarded by the previously queried default route.

Embodiments of the present invention also provide a system for implementing an emergency call, including:

The IMS network access device is configured to send an emergency call request to the emergency call processing device, and the source address information of the fixed access terminal carried in the emergency call request;

The emergency call processing device is used to obtain the source address information of the fixed access terminal carried in the emergency call request sent by the IMS network access device; query the source address information of the fixed access terminal, and obtain the emergency call route corresponding to the fixed access terminal information and add emergency call routing information to the emergency call request and send it to the IMS network, so that the emergency call request is routed to the emergency call center;

The location acquisition function device is used to query the emergency call routing information corresponding to the fixed access terminal according to the source address information of the fixed access terminal provided by the emergency call processing device, and provide it to the emergency call processing device.

Embodiments of the present invention also provide a network device, as shown in FIG. 6, including:

A communication unit 11, configured to receive an emergency call request from an IMS network access device;

The address obtaining unit 12 is configured to obtain source address information of the fixed access terminal carried in the emergency call request received by the communication unit 11; the source address information may include IP address information and/or port information.

The routing information acquiring unit 13 is configured to query the location acquiring function in the network for the source address information of the fixed access terminal acquired by the address acquiring unit 12, and acquire emergency call routing information corresponding to the fixed access terminal;

The routing information adding unit 14 is configured to add the emergency call routing information obtained by the routing information obtaining unit 13 to the emergency call request, and send the emergency call request to the IMS network through the communication unit 11, so that the emergency call request is routed to the emergency call center.

In addition, the routing information obtaining unit 10 is also used for:

When the location acquisition function does not query the access location of the fixed access terminal according to the source address information of the fixed access terminal, compare the domain name information carried in the PANI field of the emergency call request with the fixed access terminal's information obtained from the HSS The accuracy of the access location; and send more accurate domain name information or the access location of the fixed access terminal to the location acquisition function; obtain the emergency call routing information corresponding to the fixed access terminal according to the response of the location acquisition function. In addition, when the session of the fixed access terminal is initiated, the access location information of the fixed access terminal is obtained from the HSS through the Cx interface.

The embodiment of the present invention also provides an IMS network access device, as shown in FIG. 7, including:

An emergency call request receiving unit 21, configured to receive an emergency call request sent by a fixed access terminal;

The emergency call request processing unit 22 is configured to send the emergency call request received by the emergency call request receiving unit 21 to the emergency call processing device, and carry the source address information of the fixed access terminal in the emergency call request.

The emergency call request processing unit 22 is specifically used for:

The emergency call request received by the emergency call request receiving unit 21 is checked. When the access network identifier PANI domain of the emergency call request does not include the source address information and/or domain name information of the fixed access terminal, the emergency call request Complete the source address information and domain name information of the fixed access terminal in the PANI domain of the fixed access terminal and send it to the emergency call processing device.

The IMS network access device may also include:

The emergency call request checking unit 23 is used to judge whether the fixed access terminal sending the emergency call request has registered; when the fixed access terminal has registered, then notify the emergency call request processing unit 22 to process; otherwise, judge whether it can be an unregistered The fixed access terminal provides an emergency call, and if the judgment result is yes, the emergency call request processing unit 22 is notified for processing; otherwise, the fixed access terminal is triggered to initiate a registration process.

The IMS network access device may be an SBC or a P-CSCF. In addition, according to different network deployments, the SBC and the P-CSCF may also be co-located on the same network device.

The embodiment of the present invention also provides a location acquisition function device, as shown in FIG. 8, including:

The communication unit 31 is configured to receive the source address information of the fixed access terminal provided by the emergency call processing device, and send emergency call routing information corresponding to the fixed access terminal to the emergency call processing device;

The query unit 32 is configured to query the emergency call routing information corresponding to the fixed access terminal according to the source address information of the fixed access terminal provided by the emergency call processing device.

The communication unit 31 is further configured to: notify the emergency call processing device when the query unit 32 fails to query the access location of the fixed access terminal according to the source address information of the fixed access terminal;

The query unit 32 is also configured to, according to the domain name information provided by the emergency call processing device, or the access location of the fixed access terminal, in the preset correspondence between the access location and the emergency number routing information, or the domain name and the emergency number routing information In the corresponding relationship, the emergency call routing information corresponding to the access location is queried.

The query unit 32 of the location acquisition function device stores the following correspondence: (1) the correspondence between source address information and access location, so as to query the source address information of the fixed access terminal according to the source address information of the fixed access terminal; (2) The corresponding relationship between the access location and the called emergency call routing information, so that when the location information of the fixed access terminal can be identified, the query can obtain the corresponding emergency call routing information; (3) The correspondence between the domain name and the emergency call routing information Corresponding relationship, so that when the user access location information is not identifiable, the corresponding emergency call routing information can be obtained through domain name query.

The location acquisition function device may be an LRF, which provides emergency call routing information (SIP URI and TEL URI of the emergency center) corresponding to the fixed access terminal to the emergency call processing device (such as E-CSCF). The location acquisition function device can be set independently, or it can be set together with the emergency call processing device. If it is set up together, the user location information and routing information need to be configured in the emergency call processing device.

By using the method, system and equipment provided by the present invention, when the network operator does not have storage resources for connecting the session location and the storage function, the emergency call of the fixed access terminal is realized.

Through the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be realized by hardware, or by software plus a necessary general hardware platform. Based on this understanding, the technical solution of the present invention can be embodied in the form of software products, which can be stored in a non-volatile storage medium (which can be CD-ROM, U disk, mobile hard disk, etc.), including several The instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute the methods described in various embodiments of the present invention.

Those skilled in the art can understand that the drawing is only a schematic diagram of a preferred embodiment, and the units or processes in the drawing are not necessarily necessary for implementing the present invention.

Those skilled in the art can understand that the units in the device in the embodiment can be distributed in the device in the embodiment according to the description in the embodiment, and can also be changed and located in one or more devices different from the device in the embodiment. The units in the above embodiments can be combined into one unit, and can also be further divided into multiple subunits.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

Claims (16)

1. A method for implementing an emergency call, comprising: The emergency call processing device receives the emergency call request from the IP multimedia system IMS network access device, and obtains the source address information of the fixed access terminal carried in the emergency call request; The emergency call processing device queries the source address information of the fixed access terminal, and obtains emergency call routing information corresponding to the fixed access terminal; The emergency call processing device adds the emergency call routing information to the emergency call request and sends it to the IMS network, so that the emergency call request is routed to an emergency call center. 2. The method according to claim 1, wherein, before the emergency call processing device receives the emergency call request from the IP multimedia system IMS network access device, it also includes: The IMS network access device receives the emergency call request sent by the fixed access terminal; The IMS network access device verifies the emergency call request, and when the access network identifier PANI field of the emergency call request does not include the source address information and/or domain name information of the fixed access terminal, Complementing the source address information and IMS entry point domain name information of the fixed access terminal in the PANI field of the emergency call request; The IMS network access device sends the emergency call request carrying the source address information of the fixed access terminal and the IMS entry point domain name information in the PANI domain to the emergency call processing device. 3. The method according to claim 1, wherein after the IMS network access device receives the emergency call request sent by the fixed access terminal, it further comprises: The IMS network access device determines whether the fixed access terminal sending the emergency call request has registered; When the fixed access terminal has been registered, continue; otherwise, determine whether emergency calls can be provided for unregistered fixed access terminals, and if the judgment result is yes, continue, otherwise require the fixed access terminal to initiate a registration process or refuse call. 4. The method according to claim 1 or 2, wherein the emergency call processing device queries the source address information of the fixed access terminal, and acquires emergency call routing information corresponding to the fixed access terminal, including : The emergency call processing device sends the source address information of the fixed access terminal to a location acquisition function; The location acquisition function queries the access location of the fixed access terminal in the preset corresponding relationship between the source address information of the fixed access terminal and the access location according to the source address information of the fixed access terminal; When the access location of the access terminal is fixed, further query the emergency call routing information corresponding to the access location in the preset corresponding relationship between the access location and the emergency number routing information and send it; The emergency call processing device acquires the emergency call routing information corresponding to the fixed access terminal according to the response of the location acquisition function. 5. The method of claim 4, further comprising: The location acquisition function notifies the emergency call processing device when the access location of the fixed access terminal is not found according to the source address information of the fixed access terminal; The emergency call processing device compares the IMS entry point domain name information carried in the PANI field of the emergency call request with the accuracy of the subscription home access location of the fixed access terminal acquired from the home subscriber server HSS; and send the more accurate IMS entry point domain name information or the access location of the fixed access terminal to the location acquisition function; The location acquisition function further queries the emergency call routing information corresponding to the access location in the preset corresponding relationship between the access location and the emergency number routing information, or in the corresponding relationship between the domain name and the emergency number routing information, and sends it; The emergency call processing device acquires the emergency call routing information corresponding to the fixed access terminal according to the response of the location acquisition function. 6. The method according to claim 5, wherein the emergency call processing device acquires the access location of the subscription of the fixed access terminal from the HSS, comprising: When the fixed access terminal session is initiated, the emergency call processing device acquires the access location information of the subscription of the fixed access terminal from the HSS through the Cx interface. 7. A system for implementing an emergency call, comprising: The IMS network access device is configured to send an emergency call request to the emergency call processing device, the source address information of the fixed access terminal carried in the emergency call request; The emergency call processing device is configured to obtain the source address information of the fixed access terminal carried in the emergency call request sent by the IMS network access device; query the source address information of the fixed access terminal to obtain the fixed access terminal Emergency call routing information corresponding to the terminal and adding the emergency call routing information to the emergency call request and sending it to the IMS network, so that the emergency call request is routed to the emergency call center; The location acquisition function device is configured to query the emergency call routing information corresponding to the fixed access terminal according to the source address information of the fixed access terminal provided by the emergency call processing device, and provide it to the emergency call processing device. 8. A network device, characterized in that, comprising: a communication unit, configured to receive an emergency call request from an IMS network access device; An address obtaining unit, configured to obtain source address information of the fixed access terminal carried in the emergency call request received by the communication unit; a routing information obtaining unit, configured to query the location obtaining function in the network for the source address information of the fixed access terminal obtained by the address obtaining unit, and obtain emergency call routing information corresponding to the fixed access terminal; a routing information adding unit, configured to add the emergency call routing information obtained by the routing information obtaining unit to the emergency call request, and send the emergency call request to the IMS network through the communication unit, so that the emergency call request is routed to the emergency call request; Call Center. 9. The network device according to claim 8, wherein the routing information obtaining unit is further configured to: When the location obtaining function does not query the access location of the fixed access terminal according to the source address information of the fixed access terminal, comparing the IMS entry point domain name information carried in the PANI field of the emergency call request with the information of the IMS entry point domain name, and Accuracy of the access location where the subscription of the fixed access terminal is acquired from the HSS; and send more accurate IMS entry point domain name information or the access location of the fixed access terminal to the location An acquisition function: acquire emergency call routing information corresponding to the fixed access terminal according to the response of the location acquisition function. 10. The network device according to claim 9, wherein the routing information acquiring unit is further configured to, when a session of the fixed access terminal is initiated, acquire the route information of the fixed access terminal from the HSS through the Cx interface The access location information to which the subscription belongs. 11. An IMS network access device, characterized in that it comprises: An emergency call request receiving unit, configured to receive an emergency call request sent by a fixed access terminal; The emergency call request processing unit is configured to send the emergency call request received by the emergency call request receiving unit to the emergency call processing device, and carry the source address information of the fixed access terminal in the emergency call request. 12. The device according to claim 11, wherein the emergency call request processing unit is specifically configured to: Verifying the emergency call request received by the emergency call request receiving unit, when the access network identifier PANI field of the emergency call request does not include the source address information of the fixed access terminal and/or the IMS entry point domain name information , complete the source address information of the fixed access terminal and IMS entry point domain name information in the PANI field of the emergency call request and send it to the emergency call processing device. 13. The device of claim 11, further comprising: An emergency call request checking unit, configured to determine whether the fixed access terminal sending the emergency call request has registered; when the fixed access terminal has registered, notify the emergency call request processing unit to process; otherwise, determine whether it can An emergency call is provided for an unregistered fixed access terminal, and if the judgment result is yes, the emergency call request processing unit is notified for processing; otherwise, the fixed access terminal is required to initiate a registration process or reject the call. 14. The device according to any one of claims 11 to 13, wherein the IMS network access device is a Session Border Controller (SBC) or a Proxy Call Session Control Function (P-CSCF). 15. A location acquisition function device, characterized in that it comprises: A communication unit, configured to receive the source address information of the fixed access terminal provided by the emergency call processing device, and send emergency call routing information corresponding to the fixed access terminal to the emergency call processing device; The query unit is configured to query the emergency call routing information corresponding to the fixed access terminal according to the source address information of the fixed access terminal provided by the emergency call processing device. 16. The apparatus of claim 15, wherein The communication unit is further configured to: notify the emergency call processing device when the query unit fails to query the access location of the fixed access terminal according to the source address information of the fixed access terminal; The query unit is further configured to, according to the IMS entry point domain name information provided by the emergency call processing device, or the access location of the fixed access terminal, in the preset correspondence between the access location and the emergency number routing information , or the corresponding relationship between the domain name and the emergency number routing information, the emergency call routing information corresponding to the access location is queried.

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