Emergency call center matching method, device, equipment, storage medium and product

Abstract

The invention discloses an emergency call center matching method and device, equipment, a storage medium and a product, a position matching module is added in a core network, so that target network equipment is matched according to position information of a terminal, and a corresponding emergency call center is selected according to a cell global identifier of the target network equipment. In the emergency call process, the core network can match the target network equipment in real time according to the position information of the terminal, so that even if the change of the satellite position causes the change of the cell global identifier of the network equipment, the cell global identifier of the network equipment can be in one-to-one correspondence with the terminal position; and a proper emergency call center can be accurately matched.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to an emergency call center matching method, device, equipment, storage medium and product. Background Art

[0002] As the core technology of the next generation network, IP Multimedia Subsystem (IMS) provides a universal service platform for future multimedia applications. The IMS network can provide emergency call services for terminals (User Equipment, UE), such as alarm services and fire alarm services. The existing technology proposes a solution for emergency calls in the ground 5G network. When the RAN (Radio Access Network) is launched, the satellite coverage range is expanded from the original base station radius of 250 meters to 100 kilometers. The base station coverage range is increased, and there are multiple emergency call centers in the coverage area. The satellite position changes in the connected state at the minute level. The change in satellite position causes the base station to switch, resulting in changes in CGI (Cell Global Identity), so that the CGI and the location area are not one-to-one corresponding, but change dynamically. Since emergency calls need to be established in the IMS domain, the E-CSCF (Emergency-CallSession Control Function) matches the emergency call center based on the PANI (P-Access-Network-Info) header field. However, due to the change in the location of the base station, the CGI no longer strictly corresponds to the terminal location, that is, the terminal location in the PANI header field does not correspond to the CGI, resulting in the failure of matching the emergency call center and the inability to match the terminal to the emergency call center. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide an emergency call center matching method, device, equipment, storage medium and product, which can achieve correct matching between a terminal and an emergency call center after a base station is launched.

[0004] To achieve the above object, an embodiment of the present invention provides an emergency call center matching method, which is applied to a core network. The method includes:

[0005] receiving a first message sent by a network device;

[0006] When the first message carries the location information of the terminal, matching the target network device according to the location information of the terminal;

[0007] A corresponding emergency call center is selected according to the cell global identifier of the target network device.

[0008] As an improvement of the above solution, matching the target network device according to the location information of the terminal includes:

[0009] Obtain location information of several network devices;

[0010] Calculating the straight-line distance between the terminal and each network device according to the location information of the terminal and the location information of the plurality of network devices;

[0011] The network device with the shortest straight-line distance is selected as the target network device.

[0012] As an improvement of the above solution, the location information of the terminal is obtained by measurement by the terminal.

[0013] As an improvement of the above solution, the method further includes:

[0014] When the first message does not carry the location information of the terminal, a second message is sent to the network device; wherein the second message is used to inform the network device that the location information is missing from the first message.

[0015] As an improvement of the above scheme, when the network device receives the third message sent by the terminal, it obtains its wireless access technology type. If the wireless access type meets the preset wireless access type, after determining that the third message carries the location information of the terminal, it sends the first message carrying the location information of the terminal to the core network.

[0016] As an improvement of the above solution, the preset wireless access type includes at least one of low earth orbit access, medium earth orbit access and geostationary earth orbit access.

[0017] As an improvement of the above solution, the location information includes longitude and latitude.

[0018] To achieve the above object, an embodiment of the present invention further provides an emergency call center matching method, which is applied to a network device. The method includes:

[0019] Sending a first message to a core network;

[0020] When the first message carries the location information of the terminal, the core network matches the target network device according to the location information of the terminal, and selects the corresponding emergency call center according to the cell global identifier of the target network device.

[0021] As an improvement of the above solution, the method further includes:

[0022] Receive a second message sent by the core network; wherein the second message is sent by the core network when it detects that the first message does not carry the location information of the terminal, and the second message is used to inform the network device that the location information is missing in the first message.

[0023] As an improvement of the above solution, before sending the first message to the core network, the method further includes:

[0024] receiving a third message sent by the terminal;

[0025] Obtain its own wireless access technology type;

[0026] If the wireless access type meets the preset wireless access type, after determining that the third message carries the location information of the terminal, a first message carrying the location information of the terminal is sent to the core network.

[0027] As an improvement of the above solution, the preset wireless access type includes at least one of low earth orbit access, medium earth orbit access and geostationary earth orbit access.

[0028] As an improvement of the above solution, the location information includes longitude and latitude.

[0029] To achieve the above object, an embodiment of the present invention further provides an emergency call center matching device, which is applied to a core network, and the device includes:

[0030] A first message receiving module, used for receiving a first message sent by a network device;

[0031] a target network device matching module, configured to match a target network device according to the location information of the terminal when the first message carries the location information of the terminal;

[0032] The emergency call center determination module is used to select a corresponding emergency call center according to the cell global identifier of the target network device.

[0033] To achieve the above object, an embodiment of the present invention further provides an emergency call center matching device, which is applied to a network device, and the device includes:

[0034] A first message sending module, used for sending a first message to a core network;

[0035] When the first message carries the location information of the terminal, the core network matches the target network device according to the location information of the terminal, and selects the corresponding emergency call center according to the cell global identifier of the target network device.

[0036] To achieve the above objectives, an embodiment of the present invention further provides an emergency call center matching device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the emergency call center matching method as described in any of the above embodiments is implemented.

[0037] To achieve the above objectives, an embodiment of the present invention further provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the emergency call center matching method as described in any of the above embodiments.

[0038] To achieve the above objective, an embodiment of the present invention further provides a computer program product, including computer instructions, which, when executed by a processor, implement the emergency call center matching method as described in any of the above embodiments.

[0039] Compared with the prior art, the emergency call center matching method, device, equipment, storage medium and product disclosed in the present invention match the target network device according to the location information of the terminal by adding a location matching module in the core network, and select the corresponding emergency call center according to the cell global identifier of the target network device. Since the core network can match the target network device according to the location information of the terminal in real time during the emergency call process, even if the change of the satellite position causes the cell global identifier of the network device to change, the cell global identifier of the network device and the terminal position can be made to correspond one by one, thereby accurately matching to the appropriate emergency call center. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of a base station satellite access provided by an embodiment of the present invention;

[0041] Figure 2 This is an example of an emergency call session establishment solution provided by an embodiment of the present invention;

[0042] Figure 3 is a flowchart of establishing an IMS emergency session provided by an embodiment of the present invention;

[0043] Figure 4 is a flow chart of an emergency call center matching method provided by an embodiment of the present invention;

[0044] Figure 5 It is a workflow diagram of AMF provided by an embodiment of the present invention;

[0045] Figure 6 is a working flow diagram of a network device provided by an embodiment of the present invention;

[0046] Figure 7is a schematic diagram of determining a target network device provided by an embodiment of the present invention;

[0047] Figure 8 is a flow chart of another emergency call center matching method provided by an embodiment of the present invention;

[0048] Fig. 9 It is a structural block diagram of an emergency call center matching device provided by an embodiment of the present invention;

[0049] Fig.10 is a structural block diagram of another emergency call center matching device provided by an embodiment of the present invention;

[0050] Fig.11 The present invention provides a structural block diagram of an emergency call center matching device. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] See also Figure 1 , Figure 1 : is a schematic diagram of a base station satellite access provided by an embodiment of the present invention. When there is no ISL (Inter-Satellite Links) in the regenerative satellite mode (Regenerative satellite, or base station satellite access mode), the architecture of the gNB (base station) processing the payload is as follows Figure 1As shown. The gNB is located on the satellite. The gNB and NTN Gateway (Non-Terrestrial Network Gateway) together form NG-RAN (NG-Radio Access Network, 5G wireless access network). The UE (user equipment) communicates with the gNB through NR UU (New Radio Uu Interface, the interface between the new air interface UE and UTRAN), the gNB communicates with the NTN Gateway through NG over SRI (Satellite Radio Interface, the interface delivered by SIP), the gNB communicates with the 5G CN (Core Network) through the NG interface, and the 5G CN communicates with the Data Network through the N6 interface. The feeder link between the NTN Gateway and the satellite is no longer a relay. The satellite may contain additional traffic routing functions beyond the scope of the RAN. The NTN Gateway becomes a transport network layer node that supports all necessary transport protocols.

[0053] After the base station is put on the satellite, the base station coverage area is expanded, and there are multiple emergency call centers in the coverage area. The radius of an ordinary 5G base station is 250 meters, and that of a 4G base station is about 2km. After the base station is put on the satellite, the coverage area of ​​the base station is at least 50 times the original. The emergency call center is usually set according to a radius of 2km. Before the base station is put on the satellite, multiple base stations correspond to one emergency call center. After the base station is put on the satellite, the base station coverage area is increased, and one base station corresponds to multiple emergency call centers. The base station can select one of the multiple emergency call centers.

[0054] See also Figure 2 , Figure 2 This is an example of an emergency call session establishment solution provided by an embodiment of the present invention, including the following 6 steps:

[0055] Step 1: UE initially registers and the NR network sends the emergency call number to the UE.

[0056] Step 2: The UE detects a request to establish an emergency call. If the UE has previously registered normally on the NR network but has not established an emergency PDU (Protocol Data Unit) session, jump to step 4. If the UE has not previously registered normally on the NR network, execute step 3.

[0057] Step 3: The UE initiates 5GS (5G System, a general term for all 5G network elements, including NG-RAN and core network 5GC) emergency registration, and the NR network sends the emergency call number to the UE.

[0058] Step 4: The UE triggers the establishment of an emergency PDU session to carry IMS (IP Multimedia Subsystem) emergency registration and call signaling.

[0059] Step 5: If the UE is a valid user, it must use the IP address obtained in step 4 to initiate an IMS emergency registration process to the P-CSCF (Proxy-Call Session Control Function). The IMS registration application should include an emergency indication. For restricted or cardless users, the UE shall not initiate an IMS emergency registration request, but immediately execute step 6 to initiate an IMS emergency call.

[0060] Step 6: UE initiates an IMS emergency call through the IMS session establishment process ( Figure 3 The process shown in the figure) includes an emergency session indication and an IMPU (IP Multimedia Public Identity) of the UE. If the UE performs an IMS emergency registration, the UE should use the IMPU of the IMS emergency registration.

[0061] See also Figure 3 , Figure 3 The flowchart of establishing an IMS emergency session provided by an embodiment of the present invention includes the following 30 steps:

[0062] Step 1. The UE initiates an audio or audio / video emergency call session request on the emergency service DNN (Data Network Name). This emergency call session request is an INVITE message. The Request-URI (Uniform Resource Identifier) ​​header field in the INVITE message carries the emergency call URN (Uniform Resource Name), and the SDP (Session Description Protocol) in the INVITE message carries audio or audio / video media information.

[0063] Step 2: P-CSCF (Proxy Call Session Control Function) identifies the call as an emergency call based on the called number, and sends an AAR (Automatic Alternative Routing) message to PCF (Policy Control Function) to request the establishment of a dedicated bearer for emergency calls. The Service-URN AVP (Audio-Video Processor) in the AAR message indicates an emergency call, the Called-Station-Id AVP carries the name of the emergency service DNN, and the Media-Component-Description AVP carries the media information of audio or audio and video.

[0064] Step 3: PCF performs an emergency call service check and generates QoS (Quality of Service) rules for emergency calls based on the session information and user contract information carried in the AAR message, where ARP (Address Resolution Protocol) has a higher priority than ordinary calls. Then PCF sends an Npcf_SM policy control update notification request message (Npcf_SMPolicy Control_Update Notify Request) to SMF (Session Management Function), notifying SMF to create a dedicated QoS flow for audio or audio and video, and the message carries the QoS information of audio or audio and video.

[0065] Step 4. SMF responds to the Npcf_SM policy control update notification request message and returns an Npcf_SM policy control update notification response message (Npcf_SM PolicyControl_Update Notify Response) to PCF.

[0066] Step 5: PCF returns an AAA (Authentication, Authorization and Accounting) message to P-CSCF, in which the IP-CAN-Type (used to indicate the core network type accessed by the user) and RAT-Type (Radio Access Technology) AVP carry the access network type of the UE.

[0067] Step 6. SMF sends an N1N2 message transfer request (Namf_Communication_N1N2 Message Transfer Request) to AMF (Access and Mobility Management Function). During this process, SMF will call AMF's Namf_Communication_N1N2 Message Transfer service to transparently transmit the N1 message to the UE and the N2 message to the NG-RAN. The N1 message transparently transmitted to the UE is the "PDU session modification command (PDUSession Modification Command)". The N2 message transparently transmitted is the "PDU session resource modification request (PDUSession Resource Modify Request)". The N1N2 message transfer request includes the PDU session ID, N2 SMInformation (N2 Session Management Information, N2 session management information), and N1 SM Container (N1 Session Management Container, N1 session management container). Among them, N2 SM Information includes PDU session ID, audio or audio and video QFI (Qos Flow Identifier, QoS flow identifier), etc., and N1 SMContainer also includes PDU session ID, audio or audio and video QFI, etc.

[0068] Step 7. AMF responds to the N1N2 message transfer request and returns an N1N2 message transfer response (Namf_Communication_N1N2 Message Transfer Response).

[0069] Step 8: AMF sends a PDU Session Resource Modify Request to NGRAN to notify NGRAN to establish audio or audio / video QoS flow resources.

[0070] Step 9: NG RAN initiates signaling interaction with UE. NG RAN sends a PDU session modification command (PDU Session Modification Command) to UE. The PDU session modification command carries the PDU session ID.

[0071] Step 10: The UE responds to the PDU session modification command, updates the QoS information, and returns a PDU session modification complete message (PDU Session Modification Complete) to the NG RAN.

[0072] Step 11: NG RAN sends a PDU Session Resource Modify Response (PDU Session Resource Modify Response) to AMF, which includes N2 SM Information.

[0073] Step 12. AMF sends a PDU session update context request (Nsmf_PDU Session_Update SMContext Request) to SMF, which carries N2 SM Information and (optional) 5G location information.

[0074] Step 13. SMF responds to the PDU session update context request and returns a PDU session update context response (Nsmf_PDU Session_Update SM Context Response) to AMF.

[0075] Step 14: SMF sends a PFCP Session Modification Request to UPF (User Plane Function), such as sending an N4 Session Modification Request message to update the N4 session, and notifies UPF of the updated QoS information.

[0076] Step 15. UPF responds to the PFCP session modification request and returns a PFCP session modification response (PFCP Session Modification Response) to SMF, such as returning N4 Session Modification Response to SMF.

[0077] Step 16: SMF sends an Npcf_SM Policy Control_updaterequest to PCF, and the message carries the user's current location information.

[0078] Step 17: The PCF sends a RAR (Random Access Response) message to the P-CSCF to notify the establishment of the QoS flow.

[0079] Step 18: The P-CSCF returns a RAA (Requested And Authorized) message to the PCF.

[0080] Step 19: PCF returns an Npcf_SM Policy Control_Updateresponse message to SMF.

[0081] Step 20: After establishing the emergency-specific QoS flow, the P-CSCF identifies the call as an emergency call according to the Request-URI and routes the emergency call session request to the E-CSCF (Emergency-Call Session Control Function).

[0082] Step 21. E-CSCF parses the emergency service type information in the Request-URI in the emergency call session request and the UE location information in the P-Access-Network-Info header field, and queries the LRF (Location Retrieval Function) to determine the number identifier of the PSAP (Public Safety Answering Point), and routes the emergency call to the IBCF (Interconnection Border Control Function) or MGCF (Media Gateway Control Function) according to the number identifier of the PSAP, and then routes it to the PSAP (PSAP that supports IP is routed via IBCF, and PSAP that does not support IP is routed via MGCF).

[0083] Steps 22 to 30, the PSAP emergency call center replies with a 180 ringing message (the UA proxy server that receives the INVITE attempts to remind the user of the incoming call message) and a 200 OK (successful request response) message, and the UE replies with an ACK (acknowledgement character) message, and the emergency call between the UE and the PSAP is successfully established.

[0084] The above steps 1 to 30 are the process of establishing an IMS emergency session when the base station is not on-site. Emergency calls need to be established in the IMS domain. The E-CSCF matches the emergency call center based on the PANI header field. The location change of the base station causes the CGI to no longer strictly correspond to the terminal location, that is, the terminal location in the PANI header field does not correspond to the CGI, resulting in failure to match the emergency call center. To solve this technical problem, an embodiment of the present invention provides an emergency call center matching method that can achieve correct matching of the terminal and the emergency call center after the base station is on-site.

[0085] See also Figure 4 , Figure 4 : is a flowchart of an emergency call center matching method provided by an embodiment of the present invention, the emergency call center matching method is implemented by the AMF in the core network, and the emergency call center matching method includes:

[0086] S11, receiving a first message sent by a network device;

[0087] S12. When the first message carries the location information of the terminal, matching the target network device according to the location information of the terminal;

[0088] S13: Select a corresponding emergency call center according to the cell global identifier of the target network device.

[0089] Exemplarily, the network device is a satellite base station, that is, the base station in the NG RAN mentioned above. By adding a location matching module in the AMF, the location matching module is used to match the target network device according to the location information of the terminal, and the corresponding emergency call center is selected according to the cell global identifier of the target network device. During the emergency call process, the core network can match the target network device in real time according to the location information of the terminal. Even if the change in the satellite position causes the cell global identifier GCI of the network device to change, the cell global identifier GCI of the network device can be made to correspond one to one with the terminal position, thereby accurately matching to the appropriate emergency call center. In addition, without adding air interface and feeder link signaling messages, the ground network can still accurately match the nearest emergency call center.

[0090] Specifically, in step S11, the AMF receives a first message sent by the NG RAN, wherein the first message is Figure 3 The PDU session resource modification response message (PDU session resource modify response) in step 11.

[0091] Specifically, in step S12, when the first message carries the location information of the terminal, the target network device is matched according to the location information of the terminal; wherein the location information includes longitude and latitude.

[0092] Exemplarily, the location information may also include accuracy and / or aging time. The first message carries the location information of the terminal. The network device adds a coarse location request-r17 to the first message to send the longitude and latitude information and accuracy calculated by the terminal to the AMF. Figure 5 , Figure 5This is the workflow diagram of the AMF provided by the embodiment of the present invention. After receiving the first message, the AMF first determines whether the network device meets the preset wireless access type, that is, whether the base station is on the satellite. If it meets the requirements, it further determines whether the first message carries the location information of the terminal. If it does, it calls the location matching module inside the AMF and enters the subsequent step S13 for location matching. At this time, the first message includes the wireless access technology type (RAT information), location information and PDU Session ID. If the first message does not carry location information, it enters the subsequent step S14.

[0093] Specifically, the method further includes:

[0094] S14. When the first message does not carry the location information of the terminal, send a second message to the network device; wherein the second message is used to inform the network device that the location information is missing from the first message.

[0095] Exemplarily, when AMF detects that the first message does not carry the location information of the terminal, that is, the first message does not carry the coarselocationinformation-r17 element, it sends a second message to the network device. The second message is an error prompt message, informing the network device that the location information is missing in the first message, so that the network device resends the first message carrying the location information to AMF.

[0096] In the embodiment of the present invention, in order to minimize the signaling duration, the signaling messages on the feeder link should be as few as possible. In the embodiment of the present invention, the original emergency call service signaling message is used to carry the terminal location information. In addition, in the embodiment of the present invention, considering the extended characteristics of satellite mobile communication, the newly created cell is carried out along with the service signaling process to minimize the number of air-to-ground signaling messages.

[0097] Specifically, the location information of the terminal is obtained by measurement by the terminal.

[0098] Exemplarily, 5GR16 introduces a new Positioning Reference Signal (PRS), and adopts DL-TDOA (Downlink Time Difference Of Arrival), UL-TDOA (Uplink Time Difference), DL-AoD (Downlink Angle-of-Departure), UL-AOA (Uplink Angle), E-CID (Enhanced Cell-ID) and multiple positioning technologies to jointly improve positioning accuracy. In fact, in 2G, 3G, and 4G, location services (LCS) are supported. The positioning of UE can be supported by RAT-related location methods, and the location information of one or more target UEs can be requested and reported to them by the LCS client. After the base station is launched, the satellite position changes in the connected state at the minute level. The change in satellite position causes the base station to switch, resulting in a change in CGI. CGI and location area are not one-to-one corresponding, but dynamically changing, which makes the core network unable to estimate the user location through the base station CGI. And because the LCS (Location Services) positioning process is complicated, involving multiple message interactions between feeder links (satellite and ground core network), emergency calls are prolonged. In addition, the prior art stipulates that satellite phones can have a rough terminal location reporting capability, and the accuracy range of the terminal location can be adjusted, not exceeding 2km, and it is recommended to be used during periodic location updates or location queries. Therefore, in an embodiment of the present invention, the location information calculated by the terminal itself is used, such as the terminal location is marked by the terminal's own GPS (Global Positioning System) position measurement value. This method expands the original base station marking terminal location process.

[0099] Specifically, when the network device receives the third message sent by the terminal, it obtains its wireless access technology type. If the wireless access type meets the preset wireless access type, after determining that the third message carries the location information of the terminal, it sends the first message carrying the location information of the terminal to the core network.

[0100] For example, see Figure 6 , Figure 6is a workflow diagram of a network device provided in an embodiment of the present invention, wherein the preset wireless access type includes at least one of low earth orbit access (NR-Low Earth Orbit, NR-GEO), medium earth orbit access (NR-Medium Earth Orbiting, NR-MEO) and geostationary earth orbit access (Geostationary Earth Orbiting, NR-LEO). The third message is Figure 3 In the PDU session modification completion message (PDUSession Modification Complete) in step 10, when the terminal sends the PDU session modification completion message, a roar location information-r17 (rough positioning information-r17) cell is added to the message, and the cell includes the location information of the terminal. After receiving the PDU session modification completion message, the network device determines whether it meets the preset wireless access type, that is, whether it is on the satellite. If it meets the requirements, it further determines whether the third message carries the location information of the terminal. At this time, the third message includes the radio access technology type (RAT information), location information and PDU Session ID. If it carries the location information, the network device outputs the location information, adds the GPS user location information cell to the user location information (user location information) cell, including longitude, latitude, accuracy and aging time, and then sends the first message to the AMF. If the third message does not carry the location information of the terminal, the network device sends a fourth message to the terminal to inform the terminal that the third message carries the terminal location information, so that the terminal resends the third message carrying the location information to the network device. If the network device is not on satellite, the normal process is entered, and the network device's own CGI is used (not the CGI obtained by subsequent AMF location matching), and the PDU session resource modification response message (ie, the first message) sent by the network device in step 11 does not carry the terminal's location information.

[0101] Specifically, in step S12, matching the target network device according to the location information of the terminal includes:

[0102] S121, obtaining location information of several network devices;

[0103] S122, calculating the straight-line distance between the terminal and each network device according to the location information of the terminal and the location information of a plurality of network devices;

[0104] S123. Filter out the network device with the shortest straight-line distance as the target network device.

[0105] Exemplarily, a new location matching module is added to AMF, which converts all network equipment (base station) information corresponding to the ground mobile communication system covered by AMF into longitude and latitude + CGI and stores it in this module. The terminal longitude and latitude information and the locations of all ground base stations are input into this module, and after calculation, the target network equipment is output. Figure 7 , Figure 7 : is a schematic diagram of determining the target network device provided by an embodiment of the present invention. It is assumed that there are three network devices (base stations) corresponding to the ground mobile communication system covered by the AMF at this time, namely network devices B to D. The coordinate information of network device B is (a1, b1), the coordinate information of network device C is (a2, b2), the coordinate information of network device D is (a3, b3), and the coordinate information of terminal A is (a0, b0). These coordinate information can be obtained by converting the longitude and latitude information. Taking network device B as an example, according to the coordinates of network device B and terminal A Coordinate information, make a right triangle through the coordinate points of network device B and terminal A, and obtain two right-angled sides s1 and s2, where s1=a1-a0, s2=b1-b0, and the third side r1 is the straight-line distance between network device B and terminal A. Knowing s1 and s2, r1 can be solved. Using the same calculation method, the straight-line distances of r2~r3 can be obtained. After obtaining r1~r3, the network device with the shortest straight-line distance is selected as the target network device. If r3 is the shortest, network device D is the target network device.

[0106] Specifically, in step S13, after obtaining the target network device, the AMF obtains the pre-stored cell global identifier CGI of the target network device, and matches the corresponding emergency call center according to the cell global identifier CGI. It can be understood that before the base station is launched, multiple network devices (base stations) correspond to one emergency call center, that is, this emergency call center is the emergency call center closest to these base stations. Therefore, the AMF in the embodiment of the present invention pre-associates this emergency call center with the network device, and stores the association relationship in the location matching module. Even after the base station is launched, the coverage of the base station can cover multiple emergency call centers, but there is only one emergency call center associated with the base station (the closest one). Therefore, the corresponding emergency call center can be indexed according to the cell global identifier CGI of the network device. Furthermore, after obtaining the cell global identifier CGI of the target network device, such as Figure 5 As shown, at this time, AMF sends a PDU session update context request (Nsmf_PDU Session_Update SM Context Request) to SMF, corresponding to Figure 3In step 12, the PDU session update context request carries RAT information, PDU Session ID and CELL ID (i.e. the matched cell global identifier CGI), according to Figure 3 In the recorded steps 13 to 30, this CELL ID will be routed to the E-CSCF, which will eventually determine the corresponding PSAP and establish an emergency call between the UE and the PSAP.

[0107] Compared with the prior art, the emergency call center matching method disclosed in the present invention does not need to enable a special positioning process, reduces the air-to-ground terminal location acquisition process, reduces the positioning time, and shortens the service signaling process. Furthermore, the overall emergency call service process has not changed, only the terminal location information element generation process is added to the base station and the location matching module is added to the AMF, which has good compatibility with the ground network. In addition, only a simple modification is made to the process of the base station generating the terminal location information when the service process is initiated, without increasing any satellite overhead, saving satellite resources.

[0108] See also Figure 8 , Figure 8 1 is a flowchart of another emergency call center matching method provided by an embodiment of the present invention. The emergency call center matching method is implemented by a network device. The emergency call center matching method includes:

[0109] S21. Send a first message to the core network;

[0110] When the first message carries the location information of the terminal, the core network matches the target network device according to the location information of the terminal, and selects the corresponding emergency call center according to the cell global identifier of the target network device.

[0111] Specifically, the method further includes:

[0112] S22. Receive a second message sent by the core network; wherein the second message is sent by the core network when it detects that the first message does not carry the location information of the terminal, and the second message is used to inform the network device that the first message lacks the location information.

[0113] Specifically, before sending the first message to the core network, the method further includes:

[0114] S201, receiving a third message sent by a terminal;

[0115] S202, obtaining its own wireless access technology type;

[0116] S203: If the wireless access type meets the preset wireless access type, after determining that the third message carries the location information of the terminal, send a first message carrying the location information of the terminal to the core network.

[0117] Specifically, the preset wireless access type includes at least one of low earth orbit access, medium earth orbit access and geostationary earth orbit access.

[0118] Specifically, the location information includes longitude and latitude.

[0119] It is worth noting that the specific working process of the emergency call center matching method described in the embodiment of the present invention can refer to the working process of the network device described in the above embodiment, which will not be repeated here.

[0120] See also Fig. 9 , Fig. 9 1 is a structural block diagram of an emergency call center matching device 100 provided in an embodiment of the present invention, which is applied to a core network. The emergency call center matching device 100 includes:

[0121] A first message receiving module 11, used to receive a first message sent by a network device;

[0122] A target network device matching module 12, configured to match a target network device according to the location information of the terminal when the first message carries the location information of the terminal;

[0123] The emergency call center determination module 13 is used to select a corresponding emergency call center according to the cell global identifier of the target network device.

[0124] Specifically, the target network device matching module 12 is used to: obtain location information of several network devices; calculate the straight-line distance between the terminal and each network device according to the location information of the terminal and the location information of several network devices; and select the network device with the shortest straight-line distance as the target network device.

[0125] Specifically, the location information of the terminal is obtained by measurement by the terminal.

[0126] Specifically, the emergency call center matching device 200 further includes:

[0127] The second message sending module is used to send a second message to the network device when the first message does not carry the location information of the terminal; wherein the second message is used to inform the network device that the first message lacks the location information.

[0128] Specifically, when the network device receives the third message sent by the terminal, it obtains its wireless access technology type. If the wireless access type meets the preset wireless access type, after determining that the third message carries the location information of the terminal, it sends the first message carrying the location information of the terminal to the core network.

[0129] Specifically, the preset wireless access type includes at least one of low earth orbit access, medium earth orbit access and geostationary earth orbit access.

[0130] Specifically, the location information includes longitude and latitude.

[0131] It is worth noting that the working process of each module in the emergency call center matching device 100 described in the embodiment of the present invention can refer to the working process of the core network in the emergency call center matching method described in the above embodiment, and will not be repeated here.

[0132] See also Fig.10 , Fig.10 : is a structural block diagram of an emergency call center matching device 200 provided in an embodiment of the present invention, which is applied to a network device. The emergency call center matching device 200 includes:

[0133] A first message sending module 21 is used to send a first message to the core network; wherein, when the first message carries the location information of the terminal, the core network matches the target network device according to the location information of the terminal, and selects the corresponding emergency call center according to the cell global identifier of the target network device;

[0134] The second message receiving module 22 is used to receive a second message sent by the core network; wherein the second message is sent by the core network when it detects that the first message does not carry the location information of the terminal, and the second message is used to inform the network device that the location information is missing in the first message.

[0135] Specifically, the emergency call center matching device 200 further includes:

[0136] A third message receiving module, used to receive a third message sent by the terminal;

[0137] A wireless access technology type acquisition module is used to acquire its own wireless access technology type;

[0138] If the wireless access type meets the preset wireless access type, after determining that the third message carries the location information of the terminal, the first message sending module 21 sends the first message carrying the location information of the terminal to the core network.

[0139] Specifically, the preset wireless access type includes at least one of low earth orbit access, medium earth orbit access and geostationary earth orbit access.

[0140] Specifically, the location information includes longitude and latitude.

[0141] It is worth noting that the working process of each module in the emergency call center matching device 200 described in the embodiment of the present invention can refer to the working process of the network device in the emergency call center matching method described in the above embodiment, and will not be repeated here.

[0142] See also Fig.11 , Fig.11 : is a structural block diagram of an emergency call center matching device 300 provided in an embodiment of the present invention, and the emergency call center matching device 300 includes a processor 31, a memory 32, and a computer program stored in the memory 32 and executable on the processor 31. When the processor 31 executes the computer program, the steps in the above-mentioned emergency call center matching method embodiments are implemented, such as steps S11 to S13.

[0143] Exemplarily, the computer program may be divided into one or more modules / units, which are stored in the memory 32 and executed by the processor 31 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program in the emergency call center matching device 300.

[0144] The emergency call center matching device 300 may include, but is not limited to, a processor 31 and a memory 32. Those skilled in the art will appreciate that the schematic diagram is merely an example of the emergency call center matching device 300 and does not constitute a limitation on the emergency call center matching device 300. The emergency call center matching device 300 may include more or fewer components than shown in the figure, or may combine certain components, or different components. For example, the emergency call center matching device 300 may also include input and output devices, network access devices, buses, and the like.

[0145] The processor 31 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor 31 is the control center of the emergency call center matching device 300, and uses various interfaces and lines to connect various parts of the entire emergency call center matching device 300.

[0146] The memory 32 can be used to store the computer program and / or module. The processor 31 realizes various functions of the emergency call center matching device 300 by running or executing the computer program and / or module stored in the memory 32 and calling the data stored in the memory 32. The memory 32 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory 32 can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0147] Wherein, if the module / unit integrated in the emergency call center matching device 300 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor 31. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0148] An embodiment of the present invention further provides a computer program product, including computer instructions, which, when executed by a processor, implement the emergency call center matching method as described in the above embodiment.

[0149] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An emergency call center matching method, characterized in that: Applied to a core network, the method comprises: receiving a first message sent by a network device; When the first message carries the location information of the terminal, matching the target network device according to the location information of the terminal; A corresponding emergency call center is selected according to the cell global identifier of the target network device.

2. The emergency call center matching method according to claim 1, characterized in that: The matching of the target network device according to the location information of the terminal includes: Obtain location information of several network devices; Calculating the straight-line distance between the terminal and each network device according to the location information of the terminal and the location information of the plurality of network devices; The network device with the shortest straight-line distance is selected as the target network device.

3. The emergency call center matching method according to claim 1, characterized in that: The location information of the terminal is obtained by measurement by the terminal.

4. The emergency call center matching method according to claim 1, characterized in that: The method further comprises: When the first message does not carry the location information of the terminal, a second message is sent to the network device; wherein the second message is used to inform the network device that the location information is missing from the first message.

5. The emergency call center matching method according to claim 1, characterized in that: When the network device receives the third message sent by the terminal, it obtains its wireless access technology type. If the wireless access type meets the preset wireless access type, after determining that the third message carries the location information of the terminal, it sends the first message carrying the location information of the terminal to the core network.

6. The emergency call center matching method according to claim 5, characterized in that: The preset wireless access type includes at least one of low earth orbit access, medium earth orbit access and geostationary earth orbit access.

7. The emergency call center matching method according to any one of claims 1 to 6, characterized in that: The location information includes longitude and latitude.

8. An emergency call center matching method, characterized in that: Applied to a network device, the method comprises: Sending a first message to a core network; When the first message carries the location information of the terminal, the core network matches the target network device according to the location information of the terminal, and selects the corresponding emergency call center according to the cell global identifier of the target network device.

9. The emergency call center matching method according to claim 8, characterized in that: The method further comprises: Receive a second message sent by the core network; wherein the second message is sent by the core network when it detects that the first message does not carry the location information of the terminal, and the second message is used to inform the network device that the location information is missing in the first message.

10. The emergency call center matching method according to claim 8, characterized in that: Before sending the first message to the core network, the method further includes: receiving a third message sent by the terminal; Obtain its own wireless access technology type; If the wireless access type meets the preset wireless access type, after determining that the third message carries the location information of the terminal, a first message carrying the location information of the terminal is sent to the core network.

11. The emergency call center matching method according to claim 10, characterized in that: The preset wireless access type includes at least one of low earth orbit access, medium earth orbit access and geostationary earth orbit access.

12. The emergency call center matching method according to any one of claims 8 to 11, characterized in that: The location information includes longitude and latitude.

13. An emergency call center matching device, characterized in that: Applied to a core network, the device comprises: A first message receiving module, used for receiving a first message sent by a network device; a target network device matching module, configured to match a target network device according to the location information of the terminal when the first message carries the location information of the terminal; The emergency call center determination module is used to select a corresponding emergency call center according to the cell global identifier of the target network device.

14. An emergency call center matching device, characterized in that: Applied to network equipment, the device comprises: A first message sending module, used for sending a first message to a core network; When the first message carries the location information of the terminal, the core network matches the target network device according to the location information of the terminal, and selects the corresponding emergency call center according to the cell global identifier of the target network device.

15. An emergency call center matching device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the emergency call center matching method as claimed in any one of claims 1 to 12 when executing the computer program.

16. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the emergency call center matching method according to any one of claims 1 to 12.

17. A computer program product, characterized in that The method comprises computer instructions, which, when executed by a processor, implement the emergency call center matching method according to any one of claims 1 to 12.

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