CN110140365B

CN110140365B - Method and device for establishing connection

Info

Publication number: CN110140365B
Application number: CN201780082056.8A
Authority: CN
Inventors: 何岳; 金辉; 窦凤辉; 杨皓睿; 欧阳国威
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-07-11
Filing date: 2017-07-11
Publication date: 2021-02-23
Anticipated expiration: 2037-07-11
Also published as: WO2019010633A1; CN110140365A

Abstract

The embodiment of the invention discloses a method and a device for establishing connection, relates to the technical field of communication, and can solve the problem that UE cannot execute emergency service due to the fact that the UE is in a registration state. The method comprises the following steps: the UE located in the designated area sends SR information to AMF; the AMF receives the SR message sent by the UE, and after the AMF determines that the UE is located in the designated area, the AMF establishes NAS signaling connection with the UE according to the designated information; after NAS signaling connection, AMF sends SA message to UE; and the UE receives the SA message fed back by the AMF and initiates a PDU session establishment flow. The specific area at least comprises one of a forbidden area and a non-allowed area, and the SR message carries specific information which is used for indicating the UE to send the SR message for initiating the emergency service. If the SR message is replaced by the ESR message, at this time, the SA message sent by the AMF to the UE is also replaced by the feedback message corresponding to the ESR message. The scheme provided by the embodiment of the invention is suitable for establishing connection of the terminal.

Description

Method and device for establishing connection

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a method and a device for establishing connection.

Background

With the development of communication technology, a fifth Generation mobile communication technology (5th-Generation, 5G) has been developed. The concept of Mobility Restriction (Mobility Restriction) is introduced in the Mobility management of 5G. The concept of the above-mentioned flowability limitation mainly includes the following three parts: radio Access Technology restriction (RAT restriction), forbidden area (forbidden area) restriction, and service area restrictions (service area restrictions). Among them, the service area restriction may be divided into an allowed area (allowed area) restriction and a non-allowed area (non-allowed area) restriction.

According to the protocol, when a User Equipment (UE) is in an forbidden area, the UE is forbidden to initiate any communication to the network side, and when the UE is in a non-allowed area, the UE cannot initiate a Service Request (SR) message to enable the UE to enter a connected state from a registered state. That is, the UE cannot perform the emergency service because it is in the registration state.

Disclosure of Invention

The embodiment of the invention provides a method and a device for establishing connection, which can solve the problem that UE cannot execute emergency service due to the fact that the UE is in a registration state.

In order to achieve the purpose, the embodiment of the invention adopts the following technical scheme:

in a first aspect, an embodiment of the present invention provides a method for establishing a connection. The method comprises the following steps: and the UE in the designated area sends an SR message to the AMF, and after the UE receives the service acceptance SA message fed back by the AMF, the UE initiates a Protocol Data Unit (PDU) session establishment flow. The specific area at least comprises one of a forbidden area and a non-allowed area, and the SR message carries specific information which is used for indicating the UE to send the SR message for initiating the emergency service. Because the SR message that indicates that the SR message is sent by the UE to initiate the emergency service is carried in the SR message sent by the UE to the AMF, after the AMF receives the SR message, once it is determined that the UE is located in the designated area, the definition of the UE by the protocol may be ignored, and at the same time, the AMF processes the SR message due to the particularity of the designated information carried in the SR message. That is, the UE can enter the connected state from the registered state and perform the emergency service after entering the connected state, thereby solving a problem that the UE cannot perform the emergency service due to the UE being in the registered state.

In one possible design, the specifying information includes a field indicating a service type, and the service type is emergency traffic. The UE and the AMF may agree in advance, or adopt a manner that a worker configures the AMF in advance, and the like, to ensure that the AMF processes the SR message after receiving the SR message whose service type is the emergency service.

In one possible design, the designation information includes a permanent identification of the UE. For the AMF, the received SR message usually only carries the temporary representation of the UE, so that the SR message can be distinguished from the SR message received by the AMF in the normal case by adding the permanent identifier of the UE in the SR message to inform the AMF that the UE initiates the SR message for performing the emergency service.

In one possible design, the permanent identity comprises an international mobile subscriber identity IMSI or a user permanent identity SUPI. It should be noted that the permanent identifier may include a permanent identifier of another user in addition to the above-mentioned IMSI or SUPI.

In one possible design, the designation information includes emergency service indication information. In this way, the AMF can determine that the SR message transmitted by the UE is transmitted for initiating an emergency service, and thus process the received SR message.

In a second aspect, an embodiment of the present invention provides a method for establishing a connection. The method comprises the following steps: and the AMF receives the SR message sent by the UE, then determines that the UE is located in the designated area, and sends an SA message to the UE according to the designated information. The SR message carries designation information, where the designation information is used to instruct the UE to send the SR message for initiating an emergency service, and the designation area at least includes one of a forbidden area and a non-allowed area. Since the AMF can acquire the specific information from the SR message transmitted by the UE, the AMF may determine that the UE located in the specific area transmits the SR message for initiating the emergency service. Thus, the AMF processes the SR message due to the particularity of the specific information carried in the SR message. That is, the UE can enter the connected state from the registered state and perform the emergency service after entering the connected state, thereby solving a problem that the UE cannot perform the emergency service due to the UE being in the registered state.

In one possible design, the AMF sends the SA message to the UE according to the specific information, which may be specifically implemented as: and if the AMF determines that the UE sends the SR message for initiating the emergency service according to the information in the designated information, the AMF sends the SA message to the UE. The SA message may be regarded as a feedback message corresponding to the SR message sent by the UE to the AMF. If the SR message is replaced by the ESR message, at this time, the SA message sent by the AMF to the UE is also replaced by the feedback message corresponding to the ESR message.

In one possible design, the AMF determines a manner in which the UE transmits the SR message to initiate the emergency service, including: if the field indicating the service type in the specification information is emergency service, the AMF determines that the UE transmits the SR message for initiating the emergency service. The UE and the AMF may agree in advance, or adopt a manner that a worker configures the AMF in advance, and the like, to ensure that the AMF processes the SR message after receiving the SR message whose service type is the emergency service.

In one possible design, the AMF determines a manner in which the UE transmits the SR message to initiate the emergency service, including: if the permanent identity of the UE is contained in the designated information, the AMF determines that the UE transmits an SR message for initiating the emergency service. For the AMF, the received SR message usually only carries the temporary representation of the UE, so that the SR message can be distinguished from the SR message received by the AMF in the normal case by adding the permanent identifier of the UE in the SR message to inform the AMF that the UE initiates the SR message for performing the emergency service.

In one possible design, the AMF determines a manner in which the UE transmits the SR message to initiate the emergency service, including: if the designated information includes the emergency service indication information, the AMF determines that the UE transmits an SR message for initiating the emergency service. In this way, the AMF can determine that the SR message transmitted by the UE is transmitted for initiating an emergency service, and thus process the received SR message.

In a third aspect, an embodiment of the present invention provides an apparatus for connection establishment, where the apparatus is applied to a UE located in a specified area. The device can implement the functions implemented by the UE in the above method embodiments, and the functions can be implemented by hardware or by hardware executing corresponding software. The hardware or software comprises one or more modules corresponding to the functions.

In one possible design, the apparatus includes a processor and a transceiver in the structure, and the processor is configured to support the apparatus to perform the corresponding functions of the method. The transceiver is for supporting communication between the apparatus and other network elements. The apparatus may also include a memory, coupled to the processor, that retains program instructions and data necessary for the apparatus.

In a fourth aspect, an embodiment of the present invention provides an apparatus for connection establishment, where the apparatus is applied to an AMF. The apparatus may implement the functions implemented by the AMF in the above method embodiments, and the functions may be implemented by hardware or may be implemented by hardware executing corresponding software. The hardware or software comprises one or more modules corresponding to the functions.

In a fifth aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for implementing the functions implemented by the UE, which includes a program designed to execute the above aspects.

In a sixth aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for implementing the functions implemented by the AMF, which includes a program designed to execute the above aspects.

Drawings

Fig. 1 is a schematic structural diagram of a communication network system according to an embodiment of the present invention;

fig. 2 is an interaction diagram of a method for establishing a connection according to an embodiment of the present invention;

fig. 3 and fig. 4 are interaction diagrams of another method for establishing a connection according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a connection establishment apparatus according to an embodiment of the present invention;

fig. 6 to fig. 8 are schematic structural diagrams of another connection establishment apparatus according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention. For the Chinese and English comparison of the technical terms referred to herein, see Table I.

Watch 1

The embodiment of the invention can be used for a communication network system, and the communication network system at least comprises UE and AMF. The UE may interact with AN external connection through AN access (R) AN, for example, interact with the AMF for data. For example, as shown in fig. 1, a schematic diagram of a possible communication network system structure is shown, in which the communication network system includes UE, (R) AN, AMF, SMF, UPF, PCF, UDM, AF, OCS. Wherein, the AMF is used for forwarding the interactive message between the SMF and the (R) AN or the UE; the SMF is an execution point responsible for the related processing of session management and the related policy of the session; the UPF is used for transmitting user plane data and finishing the execution of the session related strategy according to the indication of the SMF; the PCF is used for making a strategy of the UE and forwarding the strategy to the (R) AN or the UE through the SMF and the UPF; the AF is used for interacting with the PCF and customizing a strategy of the UE for the application; the OCS is used for realizing related functions such as online charging and the like. It should be noted that each device in the network system architecture shown in fig. 1 is only one possible implementation manner, that means that in an actual network system architecture, some or all of the devices shown in fig. 1 may be included, and of course, the deployment of other devices may also be added, which is not limited herein.

Currently, if the UE needs to initiate an emergency service, the restriction of the protocol to the UE may be ignored even if the UE is in a designated area, i.e., the UE is in a forbidden area and/or a non-allowed area. That is, even if the UE is in the forbidden area, the UE can still initiate communication to the network side for performing the emergency service, and likewise, even if the UR is in the non-allowed area, the UE can still initiate an SR (service request) message for performing the emergency service.

In the actual data transmission process, if the UE tries to execute the emergency service, the UE needs to establish an emergency PDU session in advance. However, the request initiated by the UE to establish the PDU session belongs to the SM (session management) message, which means that it is necessary to ensure that the UE is in a connected state at this time. For the UE in the registration state, the UE may enter the connection state by sending an SR message. However, for the network side, although the protocol removes the restriction on the UE, so that the UE can successfully transmit the SR message, the access and AMF located on the network side often reject the processing after receiving the SR message due to the protocol specification, so that the UE in the registration state cannot enter the connection state, and thus the UE cannot perform the emergency service. Therefore, an embodiment of the present invention provides a method for establishing a connection, so as to solve a problem that the UE cannot execute an emergency service due to the UE being in a registration state. As shown in fig. 2, the method may be performed by the UE and the AMF shown in fig. 1, and the method may be implemented as follows:

step 101, the UE located in the designated area sends SR information to AMF.

The specific area at least comprises one of a forbidden area and a non-allowed area, and the SR message carries specific information which is used for indicating the UE to send the SR message for initiating the emergency service.

It should be noted that, in the embodiment of the present invention, an SR message is taken as an example to describe a process of triggering PDU session establishment between the UE and the AMF, and in an actual connection establishment process, the UE may further trigger an interaction procedure in the embodiment of the present invention by sending an ESR message to the AMF. That means, the SR message is only one possible example, the ESR message may be used to replace the SR message, and details of the implementation process for completing connection establishment by using the ESR message are not described herein, and the specific implementation process may refer to the implementation process for completing connection establishment by using the SR message.

Step 102, the AMF receives an SR message sent by the UE.

Step 103, AMF determines that the UE is located in the designated area.

And the AMF determines whether the UE is located in the designated area or not according to the UE position information reported by the base station.

And step 104, the AMF sends the SA message to the UE according to the information in the designated information.

After determining that the UE is located in the designated area, if the SR message is found to carry the designation information, the AMF may ignore the restriction of the protocol on the UE, and send an SA message to the UE. The SA message may be regarded as a feedback message corresponding to the SR message sent by the UE to the AMF. If the SR message is replaced by the ESR message, at this time, the SA message sent by the AMF to the UE is also replaced by the feedback message corresponding to the ESR message.

And 105, the UE receives the SA message fed back by the AMF.

Step 106, the UE initiates a PDU session establishment flow.

Compared with the prior art, the UE can successfully send the SR message, but the AMF located on the network side rejects processing after receiving the SR message due to protocol specification, so that the UE in the registration state cannot enter the connection state, that is, the UE cannot execute the emergency service, in the embodiment of the present invention, the SR message sent by the UE to the AMF carries the SR message indicating that the SR message is sent by the UE for initiating the emergency service, so that after the AMF receives the SR message, once it is determined that the UE is located in the designated area, the definition of the protocol on the UE can be ignored, and the AMF processes the SR message due to the particularity of the designated information carried in the SR message. That is, the UE can enter the connected state from the registered state and perform the emergency service after entering the connected state, thereby solving a problem that the UE cannot perform the emergency service due to the UE being in the registered state.

For the AMF, even if the UE is located in the designated area, the AMF may enable the UE to enter the connected state from the registration state as long as the SR message sent by the UE carries the designation information and the information located in the designation information can indicate that the UE sends the SR message for initiating the emergency service. Therefore, on the basis of the implementation shown in fig. 2, the implementation shown in fig. 3 can also be realized. Step 104, the AMF sends an SA message to the UE according to the information in the specific information, which may be specifically implemented as step 201:

step 201, if the AMF determines that the UE sends an SR message for initiating the emergency service according to the information in the specific information, the AMF sends an SA message to the UE.

The information in the specific information may include a field indicating a service type and the field is at least one of emergency service, a permanent identity of the UE, and emergency service indication information. In the embodiment of the present invention, if any of the above information exists in the specification information, the UE is considered to transmit an SR message for initiating an emergency service. It should be noted that, in order to ensure that the AMF can accurately identify whether the UE transmits the SR message for initiating the emergency service, the number of items of the determination condition may be modified, for example, when the specifying information includes at least two or more items of information, it is determined that the UE transmits the SR message for initiating the emergency service. Thus, the accuracy of the AMF for judging whether the UE transmits the SR message for initiating the emergency service can be further improved. It can be seen that, for the above-mentioned information, in the embodiment of the present invention, not only the content of the information is not excessively limited, but also the condition satisfying the above-mentioned information is not excessively limited, and the content mentioned here and later is shown as a possible example and is not limited to the embodiment of the present invention.

If the specific information includes a field indicating a service type, the AMF determines that the UE transmits the SR message to initiate the emergency service in a manner including:

if the field indicating the service type in the specification information is emergency service, the AMF determines that the UE transmits the SR message for initiating the emergency service.

For example, fig. 4 is an interaction diagram of connection establishment in a specific application scenario.

In step 301, after the UE in the designated area attempts to initiate the emergency service, the UE transmits a NAS service request to the (R) AN.

In the embodiment of the present invention, in the NAS service request, the field indicating the service type is an emergency service.

Step 302, (R) AN sends AN N2 message to AMF.

In the embodiment of the present invention, the N2 message includes the location information and the content in the NAS service request. The AMF may determine whether the UE is located in the designated area according to the location information after receiving the N2 message, and feed back another N2 message, i.e., an SA message, to the UE when determining that the UE is located in the designated area and the field for indicating the service type in the NAS service request is emergency service, i.e., the procedure implemented in step 303.

Step 303, AMF feeds back N2 message to (R) AN.

Step 304, RRC connection configuration is performed between the UE and the (R) AN.

In the embodiment of the present invention, the signaling plane bearer may be recovered for the UE through RRC connection reconfiguration.

Step 305, the UE initiates an emergency PDU session establishment procedure.

The type of the request initiated by the UE is an emergency service.

If the specified information includes the permanent identity of the UE, the AMF determines that the UE sends the SR message for initiating the emergency service, including:

if the permanent identity of the UE is contained in the designated information, the AMF determines that the UE transmits an SR message for initiating the emergency service.

Wherein, the permanent identity is used to indicate that the UE sends a specific message for initiating the emergency service, and the permanent identity includes IMSI or SUPI.

It should be noted that the permanent identifier is not limited to the above two cases, and may also include other permanent identifiers of the UE, which is not limited herein.

Taking the implementation manner shown in fig. 4 as an example, the NAS service request carries a permanent identifier of the UE, and then the AMF determines that the UE is in the designated area through the location information, and finds that the received SR message carries the permanent identifier of the UE, and then the AMF feeds back an N2 message, that is, a service acceptance message, to the UE. Similar to the previous implementation manner, the signaling plane bearer is restored for the UE through RRC connection reconfiguration, and the UE initiates an emergency PDU session establishment procedure.

If the specified information includes emergency service indication information, the AMF determines that the UE sends the SR message to initiate the emergency service in a manner including:

if the designated information includes the emergency service indication information, the AMF determines that the UE transmits an SR message for initiating the emergency service.

Taking the implementation manner shown in fig. 4 as an example, the NAS service request carries emergency service indication information, and then the AMF determines that the UE is in the designated area through the location information, and finds that the received SR message carries the emergency service indication information, and then the AMF feeds back an N2 message, that is, an SA message, to the UE. Similar to the implementation manners of the first two examples, the signaling plane bearer is restored for the UE through RRC connection reconfiguration, and the UE initiates an emergency PDU session establishment procedure.

Therefore, in all three possible implementation manners, when the UE is in the designated area, the AMF is ensured to process the SR message sent by the UE. It should be noted that the three possible implementations may be implemented independently, or at least two implementations may be selected, that is, the AMF processes the SR message sent by the UE only when the at least two situations exist. In the embodiment of the present invention, the implementation forms of the three possible implementation manners are not limited, and may be implemented independently or in a combined manner.

The embodiment of the present invention provides a connection establishment apparatus, which is applied to the UE, and the connection establishment apparatus includes a hardware structure and/or a software module corresponding to each function for implementing the functions. Those of skill in the art will readily appreciate that the present invention can be implemented in hardware or a combination of hardware and computer software, with the exemplary elements and algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

In the embodiment of the present invention, the device for establishing a connection may be divided into functional modules according to the method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the embodiment of the present invention is schematic, and is only a logic function division, and there may be another division manner in actual implementation.

Fig. 5 is a schematic diagram of a possible structure of the connection establishment apparatus according to the above embodiment. The apparatus 10 for connection establishment comprises: a sending module 11, a receiving module 12 and a processing module 13. The sending module 11 is configured to execute step 101 in fig. 2 and 3 by the apparatus 10 for supporting connection establishment; the receiving module 12 is used for the apparatus 10 supporting connection establishment to execute step 105 in fig. 2 and 3; the apparatus 10 for supporting connection establishment by the processing module 13 performs step 106 in fig. 2, 3, and/or other processes for the techniques described herein. The sending module 11 and the receiving module 12 are also used to support communication between the UE and other devices, such as AMF. In the embodiment of the present invention, the apparatus 10 for connection establishment may further include a storage module 14, configured to store program codes and data of the UE.

The processing module 13 may be implemented as a processor or controller, and may be, for example, a CPU, a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The transmitting module 11 and the receiving module 12 may be implemented as a transceiver, a transceiving circuit or a communication interface, etc. The memory module 14 may be implemented as a memory.

If the processing module 13 is implemented as a processor, the sending module 11, the receiving module 12 is implemented as a transceiver, and the storing module 14 is implemented as a memory, as shown in fig. 6, the apparatus 20 for establishing a connection includes: a processor 21, a transceiver 22, a memory 23, and a bus 24. Wherein the processor 21, the transceiver 22 and the memory 23 are connected to each other by a bus 24; the bus 24 may be a PCI bus or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 6, but this is not intended to represent only one bus or type of bus.

An embodiment of the present invention provides a connection establishment apparatus, which is applied to the AMF, and the connection establishment apparatus includes a hardware structure and/or a software module corresponding to each function for implementing the function. Those of skill in the art will readily appreciate that the present invention can be implemented in hardware or a combination of hardware and computer software, with the exemplary elements and algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

Fig. 7 is a schematic diagram of a possible structure of the connection establishment apparatus according to the above embodiment. The apparatus 30 for connection establishment includes: a sending module 31, a receiving module 32 and a processing module 33. Wherein, the device 30 for supporting connection establishment and the sending module 31 execute step 104 in fig. 2, step 201 in fig. 3; the receiving module 32 is used for the apparatus 30 supporting connection establishment to execute step 102 in fig. 2 and 3; the means for supporting connection establishment 30 by the processing module 33 performs step 103 in fig. 2, 3, and/or other processes for the techniques described herein. The sending module 31 and the receiving module 32 are also used to support communication between the UE and other devices such as AMF. In the embodiment of the present invention, the apparatus 30 for connection establishment may further include a storage module 34 for storing program codes and data of the UE.

The processing module 33 may be implemented as a processor or controller, and may be, for example, a CPU, a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The transmitting module 31 and the receiving module 32 may be implemented as a transceiver, a transceiving circuit or a communication interface, etc. The storage module 34 may be implemented as a memory.

If the processing module 33 is implemented as a processor, the sending module 31, the receiving module 32 is implemented as a transceiver, and the storing module 34 is implemented as a memory, as shown in fig. 8, the connection establishing apparatus 40 includes: a processor 41, a transceiver 42, a memory 43, and a bus 44. Wherein the processor 41, the transceiver 42 and the memory 43 are connected to each other by a bus 44; the bus 44 may be a PCI bus or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 8, but this is not intended to represent only one bus or type of bus.

The steps of a method or algorithm described in connection with the disclosure herein may be embodied in hardware or in software instructions executed by a processor. The software instructions may consist of corresponding software modules, which may be stored in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in the same apparatus or may be separate components in different apparatuses.

Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in connection with the embodiments of the invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the embodiments of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention.

Claims

1. A method of connection establishment, the method comprising:

user Equipment (UE) located in a designated area sends a Service Request (SR) message to an access and mobility management function (AMF), wherein the designated area at least comprises one of a forbidden area and a non-allowed area, and the SR message carries designated information which is used for indicating the UE to send the SR message for initiating emergency service; the UE is in a registration state;

and after the UE receives the service acceptance SA message fed back by the AMF, the UE initiates a Protocol Data Unit (PDU) session establishment flow.

2. The method of claim 1, wherein the specific information includes a field indicating a service type, and the service type is emergency traffic.

3. The method of claim 1 or 2, wherein the specific information comprises a permanent identity of the UE.

4. The method of claim 3, wherein the permanent identity comprises an International Mobile Subscriber Identity (IMSI) or a user permanent identity (SUPI).

5. The method of claim 1, wherein the specific information comprises emergency service indication information.

6. A method of connection establishment, the method comprising:

an access and mobility management function (AMF) receives a Service Request (SR) message sent by User Equipment (UE), wherein the SR message carries specified information which is used for indicating the UE to send the SR message for initiating an emergency service; the UE is in a registration state;

the AMF determines that the UE is located in a designated area, wherein the designated area at least comprises one of a forbidden area and a non-allowed area;

and the AMF sends a service acceptance SA message to the UE according to the specified information.

7. The method of claim 6, wherein the AMF sending an SA message to the UE according to the designation information comprises:

and if the AMF determines that the UE sends the SR message for initiating the emergency service according to the information in the designated information, the AMF sends the SA message to the UE.

8. The method of claim 7, wherein the AMF determining a manner in which the UE transmits the SR message for initiating the emergency service comprises:

and if the field indicating the service type in the specified information is emergency service, the AMF determines that the UE transmits the SR message for initiating the emergency service.

9. The method of claim 7 or 8, wherein the AMF determining a manner in which the UE transmits the SR message for initiating emergency services comprises:

and if the designated information comprises the permanent identification of the UE, the AMF determines that the UE sends the SR message for initiating the emergency service.

10. The method of claim 9, wherein the permanent identity comprises an International Mobile Subscriber Identity (IMSI) or a user permanent identity (SUPI).

11. The method of claim 6, wherein the AMF determining a manner in which the UE transmits the SR message for initiating emergency services comprises:

and if the designated information comprises emergency service indication information, the AMF determines that the UE sends the SR message for initiating emergency service.

12. An apparatus for connection establishment, the apparatus being applied to a User Equipment (UE) located in a designated area, the apparatus comprising:

a sending module, configured to send a service request SR message to an access and mobility management function entity AMF, where the specified region at least includes one of a forbidden region and a non-allowed region, and the SR message carries specified information, where the specified information is used to instruct the UE to send the SR message for initiating an emergency service; the UE is in a registration state;

a receiving module, configured to receive a service acceptance SA message fed back by the AMF;

and the processing module is further configured to initiate a protocol data unit PDU session establishment procedure after the receiving module receives the SA message fed back by the AMF.

13. The apparatus of claim 12, wherein the specific information comprises a field indicating a service type, and the service type is emergency traffic.

14. The apparatus of claim 12 or 13, wherein the designation information includes a permanent identity of the UE.

15. The apparatus of claim 14, wherein the permanent identity comprises an International Mobile Subscriber Identity (IMSI) or a user permanent identity (SUPI).

16. The apparatus of claim 12, wherein the specific information comprises emergency service indication information.

17. An arrangement for connection establishment, characterized in that the arrangement is applied to an access and mobility management function entity, AMF, and the arrangement comprises:

a receiving module, configured to receive a service request SR message sent by user equipment UE, where the SR message carries designation information, and the designation information is used to instruct the UE to send the SR message to initiate an emergency service; the UE is in a registration state;

a processing module, configured to determine that the UE is located in a designated area, where the designated area includes at least one of a forbidden area and a non-allowed area;

a sending module, configured to send a service acceptance SA message to the UE according to the specific information received by the receiving module.

18. The apparatus of claim 17, wherein the sending module is further configured to send the SA message to the UE if the AMF determines that the UE sends the SR message for initiating an emergency service according to information in the specification information.

19. The apparatus as claimed in claim 18, wherein the processing module is further configured to determine that the UE transmits the SR message for initiating an emergency service if a field indicating a service type in the specification information is an emergency service.

20. The apparatus of claim 18 or 19, wherein the processing module is further configured to determine that the UE transmits the SR message for initiating an emergency service if a permanent identity of the UE is included in the specification information.

21. The apparatus of claim 20, wherein the permanent identity comprises an International Mobile Subscriber Identity (IMSI) or a user permanent identity (SUPI).

22. The apparatus of claim 17, wherein the processing module is further configured to determine that the UE transmits the SR message for initiating an emergency service if emergency service indication information is included in the specification information.