CN115278936A

CN115278936A - Blocking method and system for radio frequency emission of wireless terminal of airborne avionics equipment

Info

Publication number: CN115278936A
Application number: CN202210898657.9A
Authority: CN
Inventors: 黄向东; 施乐; 陈士国; 肖辉; 李玉民
Original assignee: Longxing Hangzhou Avionics Co ltd
Current assignee: Longxing Hangzhou Avionics Co ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-11-01
Anticipated expiration: 2042-07-28
Also published as: CN115278936B

Abstract

The invention provides a method and a system for blocking radio frequency emission of a wireless terminal of airborne avionics equipment, and relates to the technical field of communication. The method utilizes the cooperation of an electronic switch and software control, on one hand, the electronic switch is arranged on a radio frequency transmission line, and when a user terminal receives a radio frequency closing command of airborne central control equipment, the electronic switch can be immediately closed to block radio frequency from continuously emitting outwards; on the other hand, under the condition of ensuring that the communication protocol is normal, the time consumed in the process of power-off and detachment is shortened through the timer and the AT instruction, and the radio frequency emission of the wireless terminal is rapidly blocked. The problem that the wireless terminal module cannot work normally next time due to rough power failure is avoided, and the rigid requirement for quickly blocking radio frequency emission of the wireless terminal of the airborne avionic device in a normative manner is also met.

Description

Blocking method and system for radio frequency emission of wireless terminal of airborne avionics equipment

Technical Field

The invention relates to the technical field of communication, in particular to a method and a system for blocking radio frequency emission of a wireless terminal of airborne avionics equipment.

Background

The 4/5G terminal module needs to communicate with a base station when data transmission is carried out, frequent radio frequency emission needs to be kept at the moment, and background clutter generated by the radio frequency emission can cause interference on navigation signals of an airplane and influence flight safety. Therefore, all avionics devices using 4/5G terminal modules need to completely shut down the radio frequency function before takeoff, the function is required to be immediately effective, and the condition that shutdown fails due to abnormality in the execution process cannot occur.

On one hand, when the terminal module is powered off, a Detach Request signaling (power off Detach) is sent to the network side by taking Switch off as a cause value, a default EPS bearer established in the previous process of network detachment is requested, and a power off state is registered in a core network element. Depending on the quality of the current air interface signal, this process may last for more than 15s, which takes a long time. On the other hand, if the wireless terminal module is powered off directly to block the transmission process of the radio frequency for increasing the speed, two problems may be caused:

(1) The subsequent protocol flow is abnormal;

if a terminal protocol stack is performing write operation on a certain configuration, power failure may cause the write operation to be incomplete, the configured content to be wrong, and flow abnormity to occur when the terminal protocol stack is started next time;

2) MCP memory hardware corruption;

if the power of the MCP memory is lost in the writing operation process, the hardware of the memory can be damaged, the MCP memory cannot be normally started next time, and the MCP memory is powered on to work.

In summary, a method for quickly blocking the rf transmission process of the wireless terminal and ensuring the normal function of the wireless terminal module is needed.

Disclosure of Invention

The invention aims to provide a method and a system for blocking radio frequency emission of a wireless terminal of airborne avionics equipment.

The embodiment of the invention is realized by the following steps:

in a first aspect, an embodiment of the present application provides a method for blocking radio frequency transmission of a wireless terminal of an airborne avionics device, which includes:

when the user terminal receives a command of closing the radio frequency, the electronic switch on the radio frequency transmission line is closed to block the radio frequency transmission;

the user terminal sends a detach request to the base station and starts a timer;

the base station receives the detachment request and sends the detachment request to a core network;

the core network clears all EPS bearing and TEID resources corresponding to the user terminal according to the detachment request, and sends a request for releasing the context of the user terminal to the base station;

the base station receives the request for releasing the context of the user terminal, sends a message for releasing RRC connection to the user terminal, and sends a response message to the core network after releasing the context information of the user terminal;

if the user terminal receives the RRC connection release message within the set time of the timer, timing is stopped, all EPS bearing and RB resources are emptied, and an AT instruction is sent to a wireless Modem module of the user terminal to close radio frequency transmission; and if the RRC connection release message is not received within the set time of the timer, directly clearing all EPS bearing and RB resources and sending an AT instruction to a wireless Modem module of the user terminal to close radio frequency transmission.

Based on the first aspect, in some embodiments of the present invention, the method further includes:

a user terminal sends a random access request to a base station;

the base station receives the random access request and sends a random access response message to the user terminal;

the user terminal receives the random access response message and sends an RRC connection request to the base station;

the base station receives the RRC connection request and sends a message for allowing the RRC connection to the user terminal;

the user terminal establishes a connection with the base station according to the RRC connection permission message.

if the detach request of the user terminal carries the instruction information that the user terminal is not powered off, the core network empties all EPS bearing and TEID resources corresponding to the user terminal after receiving the detach request and before sending a request for releasing the context of the user terminal to the base station, and sends a detach acceptance message to the base station;

and the base station receives the detach acceptance message and sends the detach acceptance message to the user terminal.

Based on the first aspect, in some embodiments of the present invention, the core network includes a mobility management module MME and a service gateway SGW;

after receiving a detach request sent by a base station, the MME sends an EPS bearer deletion request to a service gateway SGW;

the service gateway SGW empties all EPS bearing and TEID resources corresponding to the user terminal according to the EPS bearing deleting request, and sends an EPS bearing deleting response message to a mobility management module MME;

and after confirming the deletion of the bearer according to the EPS bearer deletion response message, the MME sends a request for releasing the context of the user terminal to the base station.

Based on the first aspect, in some embodiments of the present invention, when a core network sends a request for releasing a context of a user equipment to a base station, the request for releasing the context of the user equipment is carried in the context information of the user equipment.

Based on the first aspect, in some embodiments of the present invention, when the detach request is a switch off request, the reason for releasing the ue context information carrying cells, IECause: switch off detach;

when the detach request is a normal request, the reason that the context information of the released ue carries the cell ie cause: normal detach.

In a second aspect, an embodiment of the present application provides a blocking system for radio frequency transmission of a wireless terminal of an airborne avionics device, including:

the radio frequency electronic switch control module is used for closing the electronic switch on the radio frequency transmission line to block radio frequency transmission when the user terminal receives a radio frequency closing command;

the user terminal sends a detachment request to the base station and starts a timer;

the base station receives the detachment request and sends the detachment request to the core network, and the core network clears all EPS bearing and TEID resources corresponding to the user terminal according to the detachment request and sends a request for releasing the context of the user terminal to the base station;

a user terminal context release module, wherein the base station receives a request for releasing the user terminal context, sends a message for releasing RRC connection to the user terminal, and sends a response message to the core network after releasing the user terminal context information;

the radio frequency emission closing module stops timing if the user terminal receives the RRC connection release message within the set time of the timer, clears all EPS bearing and RB resources, and sends an AT instruction to a wireless Modem module of the user terminal to close radio frequency emission; and if the RRC connection release message is not received within the set time of the timer, directly clearing all EPS bearing and RB resources and sending an AT instruction to a wireless Modem module of the user terminal to close radio frequency transmission.

Based on the second aspect, in some embodiments of the present invention, the system further includes an RRC connection establishing module, configured to establish an RRC connection between the user terminal and the base station when the user terminal is in an IDLE state.

In a third aspect, an embodiment of the present application provides an electronic device, which includes a memory for storing one or more programs; a processor. The one or more programs, when executed by the processor, implement the method as described in any of the above first aspects.

In a fourth aspect, embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method as described in any one of the above first aspects.

Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:

the embodiment of the application provides a method and a system for blocking radio frequency emission of a wireless terminal of airborne avionics equipment, firstly, when a user terminal receives a radio frequency closing command (when an airplane takes off, a take-off signal is sent out, and then radio frequency closing operation is executed), an electronic switch on a radio frequency transmission line is closed to block the radio frequency emission, then, the user terminal sends a detachment request to a base station and starts a timer, the base station receives the detachment request and sends the detachment request to a core network, then, the core network clears all EPS bearing and TEID resources corresponding to the user terminal according to the detachment request and sends a user terminal context releasing request to the base station, after receiving the user terminal context releasing request, the base station sends a RRC connection releasing message to the user terminal and sends a response message to the core network after releasing the user terminal context information, and finally, if the user terminal receives the RRC connection releasing message within the set time of the timer, timing is stopped, all EPS bearing and RB resources are cleared, and an AT command is sent to a wireless Modem module of the user terminal to close the radio frequency emission; and if the RRC connection release message is not received within the set time of the timer, directly clearing all EPS bearing and RB resources and sending an AT instruction to a wireless Modem module of the user terminal to close radio frequency transmission. On the whole, the electronic switch is matched with software control, on one hand, the electronic switch is arranged on the radio frequency transmission line, and when the user terminal receives a radio frequency closing command, the electronic switch can be immediately closed to block the radio frequency from continuously emitting outwards; on the other hand, under the condition of ensuring that the communication protocol is normal, the time consumed in the process of power-off and detachment is shortened through the timer and the AT instruction, and the radio frequency emission of the wireless terminal is rapidly blocked. The problem that the wireless terminal module cannot work normally next time due to rough power failure is avoided, and the rigid requirement for quickly blocking radio frequency emission of the wireless terminal of the airborne avionic device in a normative manner is also met.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic flowchart illustrating an embodiment of a method for blocking radio frequency transmission of a wireless terminal of an airborne avionics device according to the present invention;

fig. 2 is a schematic flow chart of another embodiment of a method for blocking radio frequency transmission of a wireless terminal of an airborne avionics device according to the present invention;

fig. 3 is a schematic flow chart of another embodiment of a method for blocking radio frequency transmission of a wireless terminal of an airborne avionics device according to the present invention;

fig. 4 is a block diagram of a blocking system for radio frequency transmission of a wireless terminal of an airborne avionics device according to the present invention;

fig. 5 is a block diagram of an electronic device according to an embodiment of the present invention.

Icon: 1. a memory; 2. a processor; 3. a communication interface; 11. a radio frequency electronic switch control module; 12. a detach request initiating module; 13. a load-bearing deletion module; 14. a user terminal context release module; 15. and the radio frequency emission turning-off module.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the individual features of the embodiments can be combined with one another without conflict.

Examples

In the following, terms used in the present specification will be briefly described before description with reference to the accompanying drawings:

UE: user terminal equipment/mobile station, which represents a terminal device.

eNB: an eNodeB (evolved Node B), which is installed outdoors as a base station of an evolved packet core network (EPC).

EPC: an Evolved Packet Core 4G Core network of 3GPP mainly includes a Long Term Evolution (LTE) radio interface and a System Architecture Evolution (SAE).

EPS: evolved Packet System.

RB: resource Block, resource Block.

TEID: the endpoint ID of the tunnel configured between nodes in the network is set for each part in units of each bearer of the UE, and serves as an identification function.

MME: mobility Management Entity. The EPS is mainly responsible for mobility management of a control plane, user context and mobility state management, user temporary identity allocation and the like, and plays a role in controlling each entity in the EPS to provide session and mobility for the UE.

SGW: serving Gateway, serving Gateway. The SGW is a user anchor point between different access networks in 3GPP, and is responsible for data exchange of user plane when a user moves between different access technologies, so as to shield interfaces of different access networks in 3GPP and assume a gateway function of EPC.

Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a method for blocking radio frequency transmission of a wireless terminal of an airborne avionics device according to an embodiment of the present application, where the method includes the following steps:

step S1: when a user terminal (UE) receives a command of closing the radio frequency, an electronic switch on a radio frequency transmission line is closed to block radio frequency transmission;

in the steps, the airplane can send out a takeoff signal when taking off, and the radio frequency closing operation is required to be executed immediately, so that the interference of background clutter generated by radio frequency emission on a navigation signal of the airplane is avoided, and the flight safety is not influenced. After the signal indicating take-off is sent out, the user terminal receives the radio frequency closing command and closes an electronic switch (namely a radio frequency switch) arranged on the radio frequency transmission line according to the command, so that the radio frequency transmitting process of the user terminal is blocked. The radio frequency switch has the characteristics of high isolation, low insertion loss, low power consumption, high linearity, small size and light weight, and can effectively block radio frequency from continuously emitting outwards when being used in a communication system.

Illustratively, the User Equipment (UE) includes a mobile phone, a smart terminal, a multimedia device, a streaming media device, and so on.

Step S2: the user terminal sends an attachment removal request to the base station and starts a timer;

in the above steps, the User Equipment (UE) first sends a detach request to the base station (eNB), and starts the timer to start timing, so as to immediately empty all EPS bearers and RB resources after timing is finished, disconnect the connection with the base station, shorten the time consumed in the power-off detach process under the condition of ensuring that the communication protocol is normal, and quickly block the radio frequency transmission of the wireless terminal. After sending the detach request message, the User Equipment (UE) stores its current NAS security context, GUTI and TA information, and deletes the EPS bearer context. The Detach request comprises information such as GUTI, KSI-ASME, detach Type (Switch Off), and the like, wherein the GUTI refers to a user ID allocated to the EPC when the EPC is connected to a network; KSI-ASME refers to a KSI value used by a user terminal (UE); the Detach Type refers to the Type of Detach to explain to the EPC whether the Detach is due to switch off or normal Detach.

Further, referring to fig. 1 and 2, when the User Equipment (UE) is in the non-connected state, before the User Equipment (UE) sends a detach request to the base station (eNB), a connection needs to be established with the base station (eNB). Specifically, the method comprises the following steps: firstly, a user terminal (UE) sends a random access request to a base station (eNB), the base station (eNB) sends a random access response message to the user terminal (UE) after receiving the random access request, then the user terminal (UE) receives the random access response message and sends an RRC connection request to the base station (eNB), the base station (eNB) sends an RRC connection permission message to the user terminal (UE) after receiving the RRC connection request, and finally the user terminal (UE) establishes connection with the base station (eNB) according to the RRC connection permission message.

And step S3: the base station receives the detachment request and sends the detachment request to a core network;

in the above step, the base station (eNB) receives the detach request and transmits it to the core network (EPC), so that the core network (EPC) can know the intention of the user terminal (UE) to detach and process the NAS security context.

And step S4: the core network clears all EPS bearing and TEID resources corresponding to the user terminal according to the detachment request, and sends a request for releasing the context of the user terminal to the base station;

in the above steps, after receiving the detach request, the core network (EPC) stores the current NAS security context of the user, and checks the type of the detach, for example, whether the detach is switch off or normal detach. If the detach request is for reasons other than switch off, the core network (EPC) will send a detach accept message to the user terminal (UE) as a response to the detach request message. And meanwhile, clearing all EPS bearing and TEID resources corresponding to the user terminal according to the detachment request, and sending a request for releasing the context of the user terminal to the base station so as to release all network/wireless resources allocated to the user.

For example, the information requesting to release the context of the ue carries a reason for the detach request, and when the detach request is a switch off request, the reason for releasing the context of the ue carries a cell, ieccause: switch off disconnect; when the detach request is a normal request, the reason that the context information of the released ue carries the cell ie cause: normal detach.

Specifically, referring to fig. 3, the core network (EPC) includes a mobility management module MME and a service gateway SGW. After receiving a detach request sent by a base station, a mobility management module MME sends an EPS bearing deleting request to a service gateway SGW; then, the service gateway SGW empties all EPS bearers and TEID resources corresponding to the user terminal according to the EPS bearer deletion request, and sends an EPS bearer deletion response message to the mobility management module MME; and finally, after confirming the bearer deletion according to the EPS bearer deletion response message, the mobility management module MME sends a request for releasing the user terminal context to the base station.

Illustratively, the context information includes created connection information, such as APN, PGW, QCI, etc., EPS Bearer information, such as EBI, QCI, uplink and downlink AMBR, control plane and user plane addresses, etc., and some dynamic data, such as terminal capabilities (capabilities), already created Bearer list, etc. After receiving the detach request, the core network (EPC) needs to find the context information, IP, created bearer, and the like corresponding to the User Equipment (UE), so as to clear and release the context information, IP, created bearer, and the like after decryption, and disconnect the context session connection with the User Equipment (UE).

Step S5: the base station receives the request for releasing the context of the user terminal, sends a message for releasing RRC connection to the user terminal, and sends a response message to the core network after releasing the context information of the user terminal;

in the above steps, after receiving a request (Context Release Command) for releasing a user terminal Context sent from the EPC, the base station (eNB) sends a Release RRC Connection message (RRC Connection Release) to the user terminal (UE) to Release any RRC Connection that is not released, and deletes all Context information related to the UE, and finally sends a response message (UE Context Release Complete) to the core network (EPC) as a response to the request (Context Release Command) for releasing the user terminal Context.

Step S6: if the user terminal receives the RRC connection release message within the set time of the timer, timing is stopped, all EPS bearing and RB resources are emptied, and an AT instruction is sent to a wireless Modem module of the user terminal to close radio frequency transmission; and if the RRC connection release message is not received within the set time of the timer, directly clearing all EPS bearing and RB resources and sending an AT instruction to a wireless Modem module of the user terminal so as to close radio frequency emission.

In the above steps, under the condition of ensuring that the communication protocol is normal, the time consumed in the shutdown detachment process is shortened through the timer and the AT instruction, the radio frequency emission of the wireless terminal can be blocked quickly, the problem that the wireless terminal module cannot work normally next time possibly caused by rough power failure is avoided, and the hard requirement for normally blocking the radio frequency emission of the wireless terminal of the airborne avionic device is ensured.

Based on the same inventive concept, the invention further provides a blocking system for radio frequency emission of a wireless terminal of airborne avionics equipment, and please refer to fig. 4, fig. 4 is a structural block diagram of the blocking system for radio frequency emission of the wireless terminal of airborne avionics equipment provided by the embodiment of the present application. The system comprises:

the radio frequency electronic switch control module 11 is used for closing the electronic switch on the radio frequency transmission line to block radio frequency transmission when the user terminal receives a radio frequency closing command;

a detach request initiating module 12, which is used for the user terminal to send a detach request to the base station and start a timer;

a bearer deletion module 13, in which the base station receives the detach request and sends it to the core network, and the core network clears all EPS bearers and TEID resources corresponding to the ue according to the detach request and sends a request for releasing the ue context to the base station;

the user terminal context releasing module 14, the base station receives the request for releasing the user terminal context, sends the message for releasing the RRC connection to the user terminal, and sends the response message to the core network after releasing the user terminal context information;

a radio frequency emission closing module 15, if the user terminal receives the message of releasing the RRC connection within the set time of the timer, the user terminal stops timing, clears all EPS bearers and RB resources, and sends an AT command to the wireless Modem module of the user terminal to close the radio frequency emission; and if the RRC connection release message is not received within the set time of the timer, directly clearing all EPS bearing and RB resources and sending an AT instruction to a wireless Modem module of the user terminal to close radio frequency transmission.

Referring to fig. 5, fig. 5 is a block diagram of an electronic device according to an embodiment of the present disclosure. The electronic device comprises a memory 1, a processor 2 and a communication interface 3, wherein the memory 1, the processor 2 and the communication interface 3 are electrically connected with each other directly or indirectly to realize the transmission or interaction of data. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The memory 1 may be used to store software programs and modules, such as program instructions/modules corresponding to a blocking system for radio frequency transmission of a wireless terminal of an airborne avionics device provided in an embodiment of the present application, and the processor 2 executes various functional applications and data processing by executing the software programs and modules stored in the memory 1. The communication interface 3 may be used for communication of signaling or data with other node devices.

The Memory 1 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like.

The processor 2 may be an integrated circuit chip having signal processing capabilities. The Processor 2 may be a general-purpose Processor including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components.

It will be appreciated that the configuration shown in fig. 5 is merely illustrative and that the electronic device may include more or fewer components than shown in fig. 5 or have a different configuration than shown in fig. 1. The components shown in fig. 5 may be implemented in hardware, software, or a combination thereof.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist alone, or two or more modules may be integrated to form an independent part.

The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A method for blocking radio frequency transmission of a wireless terminal of an airborne avionics device, comprising:

the base station receives the request for releasing the user terminal context, sends a message for releasing RRC connection to the user terminal, and sends a response message to the core network after releasing the user terminal context;

2. The method for blocking radio frequency transmissions of a wireless terminal for an airborne avionics device of claim 1, further comprising:

a user terminal sends a random access request to a base station;

a base station receives a random access request and sends a random access response message to a user terminal;

the base station receives the RRC connection request and sends an RRC connection permission message to the user terminal;

the user terminal establishes a connection with the base station according to the RRC connection allowing message.

3. The method for blocking radio frequency emissions of a wireless terminal for an airborne avionics device of claim 1, further comprising:

if the instruction information that the user terminal is not powered off is carried in the detach request of the user terminal, the core network empties all EPS bearing and TEID resources corresponding to the user terminal after receiving the detach request and before sending a request for releasing the context of the user terminal to the base station, and sends a detach acceptance message to the base station;

4. The method for blocking radio frequency transmissions of a wireless terminal for an airborne avionics device according to claim 1, characterized in that said core network comprises a mobility management module MME and a traffic gateway SGW;

the service gateway SGW empties all EPS load-bearing and TEID resources corresponding to the user terminal according to the EPS load-bearing deleting request, and sends an EPS load-bearing deleting response message to a mobility management module MME;

and after confirming the deletion of the bearer according to the EPS bearer deletion response message, the mobility management module MME sends a request for releasing the context of the user terminal to the base station.

5. The method as claimed in claim 1, wherein the detach request is carried with the release ue context information when the core network sends a release ue context request to the base station.

6. The method of claim 5, further comprising:

when the detach request is a switch off request, the context information of the released ue carries a cell cause, IECause: switch off disconnect;

when the detach request is a normal request, the release ue context information carries a cell cause IECause: normal detach.

7. A system for blocking radio frequency emissions from a wireless terminal of an airborne avionics device, comprising:

the user terminal sends a detachment request to the base station, starts a timer and clears all EPS bearing and RB resources;

the base station receives the request for releasing the user terminal context, sends a message for releasing RRC connection to the user terminal, and sends a response message to the core network after releasing the user terminal context information;

8. The system of claim 7, further comprising an RRC connection establishment module configured to establish an RRC connection between the user terminal and the base station when the user terminal is in an IDLE state.

9. An electronic device, comprising:

a memory for storing one or more programs;

a processor;

the one or more programs, when executed by the processor, implement the method of any of claims 1-6.

10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-6.