WO2011060715A1

WO2011060715A1 - Method for implementing emergency call, system and device thereof

Info

Publication number: WO2011060715A1
Application number: PCT/CN2010/078811
Authority: WO
Inventors: 刘景磊; 陈艾; 建栋锐; 丁砾
Original assignee: 中国移动通信集团公司
Priority date: 2009-11-18
Filing date: 2010-11-17
Publication date: 2011-05-26
Also published as: CN102065068A

Abstract

The present invention provides a method for implementing emergency call, system and device thereof. The method includes: an emergency call processing device receives an emergency call request from a network access device of IP Multimedia Subsystem (IMS), then obtains the source address information of a fixed access terminal carried in said emergency call request; said emergency call processing device queries the source address information of said fixed access terminal, then obtains the emergency call center route information corresponding to said fixed access terminal. By using the embodiments of the present invention, the emergency call of the fixed access terminal is realized when a network provider does not have the storage resource of the connection session location and storage function.

Description

Method, system and device for implementing emergency call

The present invention relates to the field of communications, and in particular, to a method, system and device for implementing an emergency call. Background technique

Emergency Call Service refers to emergency special services such as fire alarms, police, medical emergency, traffic accident alarms, etc. provided to users on the telecommunications network. IMS (IP Multimedia Subsystem, IP Multimedia Subsystem) emergency call service supports fixed access terminals and mobile access terminals. One key point is to obtain user location information. The IMS core network completes the terminal to its location based on the obtained user location information. Call center transfer.

The process of processing an emergency call in a softswitch network in the prior art is: discovering the location attribute of the call source through a BSC (Base Station Controller), and sending the location attribute of the call source to the end office, the end office According to the location information of the call source, an emergency call number prefix or suffix is added and sent to the gateway office, and the emergency call is uniformly handled by the gateway office. If a mobile communication carrier has a direct link with the emergency call center, it is directly sent to the emergency call center; if the mobile communication carrier does not have a direct link with the emergency call center, the other operator is contracted by other operators. Substitute. However, this method does not support the emergency call service of the fixed access terminal.

In the standard IMS network in the prior art, the structure of the network system for implementing an emergency call is shown in FIG. 1. The emergency call processing procedure for the fixed access terminal is:

When the terminal does not carry its own location information or the location information is incomplete, the SBC (Session Border Controller)/P-CSCF (Proxy Call Serving Control Function) needs to be the same as the IMS access device. The CLF (Connective Session Location and Repository Function) interacts to obtain the complete location information of the terminal, and adds the location information of the terminal to the signaling to the E-CSCF (Emergency-CSCF, emergency call session). Control function), then the E-CSCF uses the location information to perform LRF (Location Retrieval Function) query to obtain the user. The access location corresponds to the routing information of the PSAP, and finally the call is forwarded to the PSAP (Public Safety Answering Point). When the target PSAP is not in the IMS network, the call is forwarded to the CS (Circuit Switch) domain by the MGCF (Media Gateway Control Function), and the call is finally completed. A problem with the prior art is that when the network operator does not have the storage resources of the CLF, the emergency call of the fixed access terminal cannot be implemented. Summary of the invention

Embodiments of the present invention provide a method, system, and device for implementing an emergency call, which are used to implement an emergency call for a fixed access terminal when the network operator does not have a storage resource that connects the session location and the storage function.

An embodiment of the present invention provides a method for implementing an emergency call, including:

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

The emergency call processing device acquires emergency call routing information corresponding to the fixed access terminal according to the source address information of 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.

Before the emergency call processing device receives the emergency call request from the IP multimedia subsystem IMS network access device, the method further includes:

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

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

The IMS network access device transmits an 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.

After the IMS network access device receives the emergency call request sent by the fixed access terminal, Also includes:

Determining, by the IMS network access device, whether the fixed access terminal that sends the emergency call request has been registered;

If the fixed access terminal has been registered, continue; otherwise, it is determined whether an emergency call can be provided for the unregistered fixed access terminal, and if the determination result is yes, continue, otherwise the fixed access terminal is required to initiate a registration process or refuse call.

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, including:

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

The location obtaining function queries the access location of the fixed access terminal in the correspondence between the source address information and the access location of the fixed access terminal according to the source address information of the fixed access terminal; When the access location of the access terminal is fixed, the emergency call routing information corresponding to the access location is queried and sent in the correspondence between the preset access location and the emergency number routing information;

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

Among them, it also includes:

The location obtaining function notifies the emergency call processing device when the access location of the fixed access terminal is not queried 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 domain of the emergency call request with the accuracy of the subscription location of the fixed access terminal acquired from the home subscription subscriber server HSS; And transmitting the IMS entry point domain name information with higher accuracy or the access location of the fixed access terminal to the location obtaining function;

The location obtaining function further queries and sends the emergency call routing information corresponding to the access location in a correspondence between the preset access location and the emergency number routing information, or the domain name and the emergency number routing information correspondence relationship; The emergency call processing device acquires emergency call routing information corresponding to the fixed access terminal according to the response of the location acquisition function.

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

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

An embodiment of the present invention provides an implementation system for an emergency call, including:

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

An emergency call processing device, configured to retrieve source address information of a fixed access terminal carried in an emergency call request sent by the IMS network access device; source address information of the fixed access terminal, and the fixed address Accessing emergency call routing information corresponding to the terminal and adding the emergency call routing information to the emergency call request and transmitting to the IMS network;

The location capture 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 the emergency call routing information 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 acquire source address information of the fixed access terminal carried in the emergency call request received by the communication unit;

The routing information obtaining unit is configured to query, according to the source address information of the fixed access terminal acquired by the address obtaining unit, the location acquiring function device in the network to retrieve the emergency call routing information corresponding to the fixed access terminal;

The routing information adding unit is configured to add the emergency call routing information acquired by the routing information acquiring unit to the emergency call request, and send the information to the IMS network through the communication unit.

The routing information acquiring unit is further configured to:

Obtaining the function device at the location is not queried according to the source address information of the fixed access terminal Comparing the access location of the fixed access terminal, comparing the IMS entry point domain name information carried in the PANI domain of the emergency call request, and the accuracy of the subscription location of the fixed access terminal acquired from the HSS Degree; transmitting, to the location acquiring function device, the IMS entry point domain name information with a higher degree of accuracy, or the access location of the fixed access terminal; acquiring the fixed access according to the response of the location acquiring function device Emergency call routing information corresponding to the terminal.

The routing information acquiring unit is further configured to: when the session of the fixed access terminal is initiated, obtain, by using a Cx interface, the access location information of the fixed access terminal from the HSS.

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 the fixed access terminal, and an emergency call request processing unit, configured to send the emergency call request received by the emergency call request receiving unit to the emergency call processing device, and Source address information of the fixed access terminal carried in the emergency call request.

The emergency call request processing unit is specifically configured to:

Checking 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 and/or the IMS entry point domain name information of the fixed access terminal At the time, the source address information and the IMS entry point domain name information of the fixed access terminal are complemented in the PANI field of the emergency call request and sent to the emergency call processing device.

Among them, it also includes:

An emergency call request verification unit, configured to determine whether a fixed access terminal that sends the emergency call request has been registered; notify the emergency call request processing unit to perform processing when the fixed access terminal has been registered; The emergency call may be provided for the unregistered fixed access terminal, and if the judgment result is yes, the emergency call request processing unit is notified to perform processing, otherwise the fixed access terminal is required to initiate a registration process or reject the call.

The IMS network access device is a tongue 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 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 querying 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.

The communication unit is further configured to: notify the emergency call processing device when the source address information of the fixed access terminal is not queried to the access location 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 a correspondence between the preset access location and the emergency number routing information Or, in the correspondence between the domain name and the emergency number routing information, query the emergency call routing information corresponding to the access location.

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

Receiving an emergency call request from the IMS network access device, acquiring source address information of the fixed access terminal carried in the emergency call request; obtaining the emergency call center routing information corresponding to the fixed access terminal according to the source address information, so as to make an emergency Call clearing is routed to the emergency call center. Therefore, when the network operator does not have the storage resource connecting the session location and the storage function, the emergency call of the fixed access terminal is realized. DRAWINGS

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

2 is a flowchart of a method for implementing an emergency call provided by an embodiment of the present invention;

FIG. 3 is a flow chart of an emergency call when a user is normally registered according to an embodiment of the present invention; FIG. 4 is a flow chart of an emergency call when a user is not registered according to an embodiment of the present invention; FIG. A flowchart for obtaining location information of the contract;

6 is a schematic structural diagram of a network device according to an embodiment of the present invention;

7 is a schematic structural diagram of an IMS network access device according to an embodiment of the present invention; FIG. 8 is a schematic structural diagram of a location acquiring function device according to an embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

An embodiment of the present invention provides a method for implementing an emergency call. As shown in FIG. 2, the method includes: Step s201: An emergency call processing device receives an emergency call request from an IMS network access device, and acquires an emergency call request. Source address information of the fixed access terminal; the source address information may include IP address information and/or port information, etc.

Step s202: The emergency call processing device queries the source address information of the fixed access terminal, and obtains the emergency call center routing information corresponding to the fixed access terminal.

Step s203: The emergency call processing device adds the emergency call center routing information to the emergency call request and sends the information to the IMS network, so that the emergency call request is routed to the emergency call center.

The emergency call processing device may be an E-CSCF; the IMS network access device may be an SBC or a P-CSCF.

In the above step s202, the emergency call processing device may obtain the emergency call center routing information corresponding to the fixed access terminal from the location acquiring function device, and the location obtaining function device may be an LRF, CLF or HSS (Home Subscriber Server, Home Subscriber Server) ).

The implementation method of the emergency call provided in the embodiment of the present invention is described below in conjunction with a specific network scenario. In the current network, a key point of the emergency call is to obtain the location information of the fixed access terminal, and 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 method for implementing an emergency call provided by the present invention, the user location information is recorded and transmitted using a SIP (Session Initiation Protocol) extended message header P-Access-Network-Info (abbreviated as PANI). 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;" The IP address of the fixed access terminal is 202.106.2.1 and the port is 20000.

The SBC can also insert IMS entry point domain name information into the PANI, such as the domain name information of the SBC, such as:

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

=20000"; "SBC-domain-sbcl.010.bj.chinamobile.com; "

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

In the present invention, the emergency call flow when the user registers normally is as shown in FIG. 3, and includes:

Step s301: The UE establishes an IP connection with the IMS through the IP-CAN, and has obtained the access location.

The address of the SBC, but the UE has not completed registration.

Step s302: The UE completes a normal IMS registration process of the returning domain;

Step s303: The Invite request of the UE to initiate an emergency call, where the Request URI includes an emergency service number:

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 to the header field. , including: access mode, IP address information, etc. of the UE;

Step s304: The accessing SBC receives the Invite request, performs PANI header domain processing, and sends the packet to the local P-CSCF, specifically:

When the information about the access location of the UE is insufficient (the P-Access-Network-Info header field is not available), the domain name information and user source IP information of the SBC may be filled in the P-Access-Network-Info header field according to the local area information (SBC may The identified user public network IP information), and forwards the Invite request to the local P-CSCF; if the UE Invite relies on the P-Access-Network-Info header field, the SBC identifies the UE access location information, in the P-Access -Network-Info header domain UE comes with information, fill in the SBC domain name information and user source IP information, and forward this Invite request to the local P-CSCF;

Step s305: After receiving the Invite request, the P-CSCF identifies the emergency call, and the P-CSCF performs integrity and legality verification on the P-Access-Network-Info header field. If the header field is not available, the P-CSCF is based on the P-CSCF. The accessed SBC information is responsible for completing the domain name information of the header area including the area code, which is SBC in this embodiment. Domain name, and forward this request to the local E-CSCF; here, if the P-CSCF can complete the CLF query, the P-CSCF queries the user access information and fills the user access information into the P-Access. -Network-Info header field and forwarded to the local E-CSCF;

Step s306: After receiving the Invite request, the E-CSCF extracts the source IP address or user access information of the P-Access-Network-Info header domain and the emergency number in the Request URI, and initiates the emergency call routing of the user to the LRF. Number inquiry;

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

When the IP address is not 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 through the extended Cx interface of the solution, so as to compare with the SBC domain name, and select more accurate access. Information acquisition route. For the scenario where the user nomadic source IP is not trusted and other scenarios that cannot accurately identify the user access, the E-CSCF needs to be able to query the default emergency routing code according to the area code information in the SBC domain, and route the emergency call to the default of the SBC access point. Emergency call center.

The E-CSCF cannot query the user access location according to the user 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 other operators' untrusted IP addresses.)

The E-CSCF continues to query the default emergency call routing code of the user according to the SBC domain, and returns the default route.

The E-CSCF should be able to initiate a user subscription location query to the local HSS through the extended Cx interface. If the user can sign the location, the format is "area code. local pinyin. district pinyin", such as "OlO.beijing.chaoyang", need Compare with the area code 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 code comparison is different, the emergency call is forwarded by the previously queried default route. The embodiment of the present invention is not limited to the use of the format of the above-mentioned "area number. City Pinyin. District Pinyin", and may also use the zip code or the like to query the user signing location, such as initiating a user signing location query to the local HSS, and querying the zip code as ""100047", 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) a correspondence 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) Correspondence between the access location and the called emergency call routing information, so as to obtain the corresponding emergency call routing information when the location information of the fixed access terminal is identifiable; (3) SBC domain name and emergency call routing information Corresponding relationship, so that when the user access location information is unrecognizable, the corresponding emergency call routing information is 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 the user nomadic source>untrusted scene and other scenarios that cannot accurately identify the user accessing the place, The E-CSCF needs to be able to route this emergency call to a unified emergency call center at the SBC access point.

Step s309: After receiving the Invite request, the MGCF routes the request to the GMSC in the location of the called emergency center according to the called area number 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 route, 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 the IP-CAN, and has obtained the address of the accessing SBC, but the UE has not completed registration;

Step s402: The UE is not registered, and an Invite request for initiating an emergency call is performed;

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 to the header field. Including: the access mode of the UE, the source address information, etc.; adding the own IP address in the Contact header field (may also include the sos indication);

In the P-Prefered-Identity header field, the UE fills in the device ID (in the device identifier); in the Contact header field, it enters its own IP address. Step s403: The access location SBC receives the Invite request, and identifies that the emergency call is not registered, and the SBC performs the following analysis:

When the information about the access location of the UE is insufficient (the P-Access-Network-Info header field is not available), the domain name information and the user source IP information of the SBC are filled in the P-Access-Network-Info header field according to the local area information, and 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 access location information, and after the P-Access-Network-Info header domain UE comes with information, fill in the SBC domain name information and the user source IP address. Information, and forward this Invite request to the local P-CSCF;

Step s404: After receiving the Invite request, the P-CSCF identifies that the emergency call is not registered. If the access location does not allow unregistered calls, the UE needs to initiate a registration process; if the access network allows unregistered calls, it may provide no When registering the emergency service, 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 containing the area code according to the accessed SBC information. And forwarding the request to the local E-CSCF; if the P-CSCF can complete the CLF query, the P-CSCF checks the user access information and fills the user access information into the P-Access-Network-Info header field. And forwarded to the local E-CSCF

Step s405: After receiving the Invite request, the E-CSCF extracts the source IP information or the user access information of the P-Access-Network-Info header domain and the emergency number in the Request URI, and initiates the emergency call routing of the user to the LRF. Number inquiry;

Step s406: The LRF queries the specific location information accessed by the user according to the user source IP information, and obtains the emergency call routing number of the area according to the user location and the emergency number, and returns to the E-CSCF;

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

Step s408: After receiving the Invite request, the MGCF routes the request to the GMSC in the location of the called emergency center according to the called area number of the Request URI, and enters the PLMN network;

In step s409, the PLMN network connects to the local emergency call center according to the local emergency call route, and the session is established. For the fixed user, in the non-nomadic scenario, 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. The subscription location information takes precedence over the extension provided by the P-CSCF. Enter location information. The E-CSCF analyzes the LRF of the emergency call center according to the subscription location information and the emergency call number obtained by the user registration, and then routes the emergency call according to the routing number.

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

(1) The user initiates a registration process, and sends a 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 home I-CSCF. After the I-CSCF allocates the S-CSCF to the user, the S-CSCF downloads the user authentication information from the HSS and completes the subsequent UE authentication and authentication process. .

(3) After the S-CSCF completes the authentication, it obtains the user subscription information from the HSS.

(4) The HSS returns the user's subscription information to the S-CSCF, and at the same time retrieves the user's subscription location letter.

The E-CSCF continues to query the default emergency call routing code of the user 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 can sign the location, the format is "area number. local pinyin. district pinyin", such as "OlO.beijing.chaoyang", The area codes in the SBC domain are compared. If the area codes are the same, the LRF is re-queried according to the user's subscription location information to obtain the emergency call routing code. If the area code comparison is different, the emergency call is forwarded by the previously queried default route. An embodiment of the present invention further provides an implementation system for an emergency call, including:

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

An emergency call processing device, configured to acquire source address information of a fixed access terminal carried in an emergency call request sent by an IMS network access device, and obtain an emergency corresponding to the fixed access terminal according to the source address information of the fixed access terminal Call routing information and add emergency call routing information to the emergency call request and send it to the IMS network;

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 the emergency call processing device to the emergency call processing device.

The embodiment of the present invention further provides a network device, where the functions of the emergency call processing device can be integrated on the network device. As shown in FIG. 6, the method includes:

The communication unit 11 is configured to receive an emergency call request from the IMS network access device, and 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 It may include IP address information and/or port information, and the like.

The routing information extracting unit 13 is configured to query, according to the source address information of the fixed access terminal acquired by the address capturing unit 12, the location acquiring function device in the network to obtain the 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 acquired by the routing information acquiring unit 13 to the emergency call request, and send it 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 further configured to:

When the location acquisition function device does not query the access location of the fixed access terminal according to the source address information of the fixed access terminal, compares the domain name information carried in the PANI domain of the emergency call and the fixed access obtained from the HSS. The accuracy of the access location of the terminal; and the more precise domain The name information, or the access location of the fixed access terminal, is sent to the location acquisition function device; and the emergency call routing information corresponding to the fixed access terminal is obtained according to the response of the location acquisition function device. In addition, when the fixed access terminal session is initiated, the access location information of the fixed access terminal is obtained from the HSS through the Cx interface.

The network device can be an E-CSCF,

An embodiment of the present invention further 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; an emergency call request processing unit 22. Source address information for transmitting the emergency call request received by the emergency call request receiving unit 21 to the emergency call processing device and carrying the fixed access terminal in the emergency call request.

The emergency call solicitation processing unit 22 is specifically configured to:

The emergency call request received by the emergency call request receiving unit 21 is verified. When the access network identifier PANI field of the emergency call request does not include the source address information and/or the domain name information of the fixed access terminal, the emergency call is made. The requested PANI field complements the source address information and domain name information of the fixed access terminal and transmits it to the emergency call processing device.

The IMS network access device may further include:

The emergency call clearing check unit 23 is configured to determine whether the fixed access terminal that sent the emergency call request has been registered; notify the emergency call request processing unit 22 to perform processing when the fixed access terminal has already registered; otherwise, determine whether it can be unregistered The fixed access terminal provides an emergency call. If the determination result is yes, the emergency call request processing unit 22 is notified to perform processing, otherwise the fixed access terminal is triggered to initiate the registration process.

The IMS network access device may be an SBC or a P-CSCF. In addition, depending on the implementation of the network deployment, the SBC and the P-CSCF may also be combined with the same network device.

The embodiment of the present invention further provides a location acquisition function device, as shown in FIG. 8, including: a communication unit 31, configured to receive source address information of a fixed access terminal provided by an emergency call processing device, and process the emergency call The device sends the emergency call routing information corresponding to the fixed access terminal; the query unit 32 is configured to use the source address of the fixed access terminal provided by the emergency call processing device Information, query the emergency call routing information corresponding to the fixed access terminal.

The communication unit 31 is further configured to: notify the emergency call processing device when the query unit 32 does not 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 further 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 correspondence between the preset 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 obtaining function device has the following correspondence relationship: (1) a correspondence between the source address information and the 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) Correspondence between the access location and the called emergency call routing information, so as to obtain the corresponding emergency call routing information when the location information of the fixed access terminal is identifiable; (3) domain name and emergency call routing information Corresponding relationship, so that when the user access location information is unrecognizable, the corresponding emergency call routing information is obtained through the domain name query.

The location capture function device may be an LRF, providing an emergency call processing device (such as an E-CSCF) with emergency call routing information (SIP URI and TEL URI of the emergency center) corresponding to the fixed access terminal. The location acquisition function device can also be a CLF or HSS. The location acquisition function device can be set separately or in combination with the emergency call processing device. If it is set, the user location information and routing information need to be configured in the emergency call processing device.

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

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

Those skilled in the art will appreciate that the drawings are only schematic representations of a preferred embodiment, A unit or process is not necessarily required to practice the invention.

Those skilled in the art can understand that the units in the apparatus in the embodiment can be distributed in the apparatus of the embodiment according to the description of the embodiment, or the corresponding changes can be located in one or more apparatuses different from the embodiment. The units of the above embodiments may be combined into one unit, or may be further split into a plurality of subunits.

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

Claims

Rights request

A method for implementing an emergency call, comprising:

The method of claim 1, wherein the emergency call processing device before receiving the emergency call request from the IP multimedia subsystem IMS network access device further includes:

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

The method of claim 1, wherein the IMS network access device, after receiving the emergency call request sent by the fixed access terminal, further includes:

The method according to claim 1 or 2, wherein the emergency call processing device queries the source address information of the fixed access terminal to obtain an emergency call corresponding to the fixed access terminal. Call routing information, including:

The emergency call processing device acquires 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 emergency call processing device compares the IMS entry point domain name information carried in the PANI domain of the emergency call request and the accuracy of the subscription location of the fixed access terminal acquired from the home subscription subscriber server HSS. And transmitting 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 obtaining function further queries and sends the emergency call routing information corresponding to the access location in a correspondence between the preset access location and the emergency number routing information, or the domain name and the emergency number routing information correspondence relationship;

The method according to claim 5, wherein the emergency call processing device extracts the access location of the fixed access terminal from the HSS, including:

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

7. An emergency call implementation system, comprising: An IMS network access device, configured to send an emergency call request to the emergency call processing device, where the source address information of the fixed access terminal carried in the emergency call request is

An emergency call processing device, configured to acquire source address information of a fixed access terminal carried in an emergency call request sent by the IMS network access device, and obtain the fixed access according to source address information of 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 sent to the IMS network;

The location obtaining 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 the emergency call routing information to the emergency call processing device.

8. A network device, comprising:

The routing information obtaining unit is configured to query, according to the source address information of the fixed access terminal that the address obtaining unit retrieves, the location obtaining function device in the network to obtain the emergency call routing information corresponding to the fixed access terminal;

The network device according to claim 8, wherein the routing information acquiring unit is further configured to:

When the location acquiring function device 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 of the IMS entry point carried in the PANI domain of the emergency call request, And the accuracy of the subscription location of the fixed access terminal obtained from the HSS; and transmitting the more accurate IMS entry point domain name information or the access location of the fixed access terminal to the The location acquisition function device acquires emergency call routing information corresponding to the fixed access terminal according to the response of the location acquisition function device.

10. The network device as claimed in claim 9, wherein the routing information acquisition list The element is further configured to: when the fixed access terminal session is initiated, obtain, by using a Cx interface, the access location information of the fixed access terminal from the HSS.

An IMS network access device, comprising:

12. The device of claim 11, wherein the emergency call request processing unit is specifically configured to:

Checking 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 and/or the IMS entry point domain name information of the fixed access terminal At the time, the source address information and the IMS entry point domain name information of the fixed access terminal are complemented in the PANI domain of the emergency call request and sent to the emergency call processing device.

13. The device according to claim 11, further comprising:

An emergency call request checking unit, configured to determine whether a fixed access terminal that sends the emergency call request has been registered; notify the emergency call request processing unit to perform processing when the fixed access terminal has been registered; The emergency call may be provided for the unregistered fixed access terminal, and if the judgment result is yes, the emergency call request processing unit is notified to perform processing, otherwise the fixed access terminal is required to initiate a registration process or reject the call.

The device according to any one of claims 11 to 13, characterized in that 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, comprising:

a communication unit, configured to receive 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;

a query unit, configured to source a fixed access terminal according to the emergency call processing device The address information is used to query the emergency call routing information corresponding to the fixed access terminal.

16. Apparatus according to claim 15 wherein:

The communication unit is further configured to: notify the emergency call processing device when the query unit does not query the access location of the fixed access terminal according to the source address information of the fixed access terminal; The IMS entry point domain name information provided by the emergency call processing device, or the access location of the fixed access terminal, in a preset correspondence between the access location and the emergency number routing information, or the domain name and the emergency In the number routing information correspondence relationship, the emergency call routing information corresponding to the access location is queried.