CN116647936B

CN116647936B - PDN connection method and communication system

Info

Publication number: CN116647936B
Application number: CN202310492012.XA
Authority: CN
Inventors: 丁明; 彭正红
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2024-04-26
Anticipated expiration: 2042-11-30
Also published as: CN115551117B; CN116647936A; CN115551117A

Abstract

The application provides a PDN connection method and a communication system, relates to the field of mobile communication, and can optimize the process of establishing PDN connection by a user terminal through NAS. The method comprises the following steps: the NAS equipment receives a PDN connection request from a user terminal; the PDN connection establishment request is used for requesting to confirm whether to establish the PDN connection; the PDN connection request carries indication information; under the condition that the indication information is used for indicating the PDN connection to establish session control capability, the NAS equipment returns a PDN connection response to the user terminal; the PDN connection response is used to indicate that a PDN connection is established.

Description

PDN connection method and communication system

Technical Field

The present application relates to the field of mobile communications, and in particular, to a PDN connection method and a communication system.

Background

Based on the existing third generation partnership project (3GPP,3rd Generation Partnership Project), the user terminal needs to perform initial registration to attach to the core network in the case of switching on or switching from the flight model to the normal mode or network loss and then entering the network. In this procedure, a Packet Data Network (PDN) connection establishment procedure (or PDN bearer establishment procedure) must be accompanied. During the establishment of the PDN connection, the UE may establish the PDN connection through a non-access stratum (NAS).

Disclosure of Invention

The embodiment of the application provides a PDN connection method and a communication system, which can optimize the process of establishing PDN connection by a user terminal through NAS.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical scheme:

Currently, there is a user service table (user service table, UST) stored in a user identity card (user identity module, UIM) issued by a part of operators, which requires a PDN connection (or may be referred to as a PDN bearer) setup session control (CC) capability established by a User Equipment (UE), and the PDN connection setup session control capability requires the NAS layer to interact with the UIM, so that the UIM determines whether the PDN connection can be established according to its own capability or the capability of the user equipment in which the UIM is located. However, if the UIM is blocked for a number of possible reasons, the NAS needs to interact with the UIM, the UIM will not be able to complete the interaction with the NAS. In this way, the PDN connection cannot be established, and the UE cannot normally access the internet, which seriously affects the user experience.

In a first aspect, the present application provides a PDN connection method, including: the NAS equipment of the non-access stratum receives a Packet Data Network (PDN) connection request from a user terminal; the PDN connection establishment request is used for requesting to confirm whether to establish the PDN connection; the PDN connection request carries indication information; under the condition that the indication information is used for indicating the PDN connection to establish session control capability, the NAS equipment returns a PDN connection response to the user terminal; the PDN connection response is used to indicate that a PDN connection is established.

Based on the technical scheme, in the process that the user terminal establishes PDN connection in the initial registration network, NAS equipment firstly receives the PDN connection request of the user terminal. After that, even if the user terminal requests the user terminal to establish the PDN bearer establishment session control capability due to the UST in the UIM card, the indication information carried in the PDN connection request sent by the user terminal to the NAS device indicates the PDN connection establishment session control capability. The NAS device does not interact with the UIM in the user terminal, but returns a connection response to the user terminal, so that the user terminal successfully establishes the PDN connection. Therefore, the PDN connection cannot be normally established by the user terminal due to the blocking problem of the UIM, and the use experience of the user is ensured.

In one possible design manner of the first aspect, the method further includes: the NAS equipment returns a PDN connection response to the user terminal under the condition that the indication information is used for indicating that the PDN connection does not establish session control capability; the PDN connection response is used to indicate that a PDN connection is established.

Based on the above scheme, the NAS device may not interact with the UIM in the user terminal, but directly return a connection response to the user terminal, so that the user terminal successfully establishes the PDN connection, when it is determined that the indication information in the PDN connection request of the user terminal indicates that the connection does not establish the session control capability, that is, the UST in the UIM card in the user terminal does not require the user terminal to establish the PDN bearer to establish the session control capability. The PDN connection is quickly established by the user terminal, and the use experience of the user is ensured.

In one possible design manner of the first aspect, the NAS device includes a management apparatus and a session control CC apparatus; the NAS device receiving a packet data network PDN connection request from a user terminal, comprising: the management device receives a PDN connection request from a user terminal;

In the case that the indication information is used to indicate the PDN connection establishment session control capability, the NAS device returns a PDN connection response to the user terminal, including: the management device sends a PDN connection request to the CC device; the CC device responds to the PDN connection request, and sends a PDN connection response to the management device under the condition that the indication information is used for indicating the PDN connection establishment session control capability; the management device sends a PDN connection response to the user terminal.

In an actual communication system, the NAS includes a management apparatus and a CC apparatus for implementing session control. Therefore, based on the technical scheme, the management device in the NAS equipment can transmit the PDN connection request of the user terminal to the CC device for processing, and the CC device directly sends PDN connection response to the user terminal through the management device under the condition that the indication information in the PDN request indicates that the PDN connection needs to establish session control capability, so that the user terminal smoothly establishes the PDN connection, and the use experience of the user is ensured.

In one possible design of the first aspect, the management device includes an evolved packet system mobility management (EPS (evolved PACKET SYSTEM, evolved packet system) mobility management, EMM) sub-device and an evolved packet system session management (EPS session management, ESM) sub-device;

The management device receives a PDN connection request from a user terminal, including: the EMM sub-device receives a packet data network PDN connection request from the user terminal;

the management device sends a PDN connection request to the CC device, including: the EMM sub-device sends a PDN connection request to the CC device through the ESM sub-device;

The CC device sending a PDN connection response to the management device in response to the PDN connection request, in case the indication information is used to indicate a PDN connection establishment session control capability, comprising: the CC device responds to the PDN connection request, and sends PDN connection response to the EMM device through the ESM device under the condition that the indication information is used for indicating the PDN connection to establish session control capability;

The management device sends a PDN connection response to the user terminal, including: the EMM sub-device sends a PDN connection response to the user terminal.

In an actual communication system, the management device in the NAS may include an EMM sub-device and an ESM sub-device. The EMM sub-device is mainly used for providing a PDN bearer of the evolved packet system (i.e., a bearer established after the PDN connection is successful) to provide a mobility management service, and meanwhile, the EMM sub-device is also used for providing a connection management service for the ESM sub-device. That is, the ESM subassembly needs to acquire signaling sent by the user terminal to the NAS from the EMM subassembly. The ESM sub-device is mainly used for providing session management service for PDN bearer, i.e. is mainly responsible for handling PDN bearer context of the user terminal and the network side. Based on this, as mentioned in the above technical solution, the management device receives a PDN connection request, in particular the EMM sub-device receives a PDN connection request of the user terminal. The subsequent EMM sub-device needs to send the PDN connection request to the ESM sub-device, which sends the PDN connection request to the CC device for processing. Under the condition that the CC device determines that the indication information in the PDN request indicates that the PDN connection needs to establish session control capability, PDN connection response is directly sent to the user terminal through the management device, so that the user terminal smoothly establishes PDN connection, and the use experience of a user is ensured.

In a possible design of the first aspect, the indication information includes a flag bit; the method comprises the steps that under the condition that a flag bit is a first preset value, indication information is used for indicating the session control capability of PDN connection establishment; and under the condition that the flag bit is a second preset value, the indication information is used for indicating that the PDN connection does not establish session control capability.

In a second aspect, the present application provides a communication system, in one possible design of the second aspect, comprising: a non-access stratum NAS device, configured to receive a PDN connection request from a user terminal; the PDN connection establishment request is used for requesting to confirm whether to establish the PDN connection; the PDN connection request carries indication information; the NAS device is further used for returning a PDN connection response to the user terminal under the condition that the indication information is used for indicating the PDN connection establishment session control capability; the PDN connection response is used to indicate that a PDN connection is established.

In a possible design manner of the second aspect, the NAS device is further configured to, in a case where the indication information is used to indicate that the PDN connection does not establish the session control capability, return a PDN connection response to the user terminal; the PDN connection response is used to indicate that a PDN connection is established.

In one possible design of the second aspect, the NAS device includes a management apparatus and a session control CC apparatus; a management device for receiving a PDN connection request from a user terminal; the management device is also used for sending a PDN connection request to the CC device; CC means for transmitting a PDN connection response to the management means in response to the PDN connection request from the management means, in the case that the indication information is used to indicate PDN connection establishment session control capability; the management means is also for sending a PDN connection response from the CC means to the user terminal.

In one possible design of the second aspect, the management device includes an evolved packet system mobility management EMM sub-device and an evolved packet system session management ESM sub-device; EMM sub-means for receiving a packet data network PDN connection request from a user terminal; the EMM sub-device is further configured to send a PDN connection request to the CC device through the ESM sub-device; the CC device is specifically configured to: responding to the PDN connection request, and sending a PDN connection response to the EMM sub-device through the ESM sub-device under the condition that the indication information is used for indicating the PDN connection establishment session control capability; the EMM sub-means is also for sending a PDN connection response to the user terminal.

In one possible design of the second aspect, the indication information includes a flag bit; the method comprises the steps that under the condition that a flag bit is a first preset value, indication information is used for indicating the session control capability of PDN connection establishment; and under the condition that the flag bit is a second preset value, the indication information is used for indicating that the PDN connection does not establish session control capability.

In a third aspect, a session control apparatus is provided, which is applied to a NAS device, where the NAS device includes a management apparatus and the session control apparatus. The session control device comprises a receiving module, a processing module and a sending module.

The receiving module is used for receiving a PDN connection request from the management device; the PDN connection request is used for requesting to confirm whether PDN connection is established or not; the PDN connection request carries indication information; the PDN connection request is sent by the user terminal to the management apparatus. The processing module is used for responding to the PDN connection request received by the receiving module, and controlling the sending module to send PDN connection response to the management device so that the management device sends the PDN connection response to the user terminal under the condition that the indication information in the PDN connection request indicates the PDN connection establishment session control capability; the PDN connection response is used to indicate that a PDN connection is established.

In a possible design manner of the third aspect, the processing module is further configured to: in response to the PDN connection request received by the receiving module, the control sending module sends a PDN connection response to the management device so that the management device sends the PDN connection response to the user terminal under the condition that the indication information in the PDN connection request indicates that the PDN connection does not establish session control capability.

In a fourth aspect, the present application provides a computer readable storage medium comprising computer instructions which, when run on a session control device, cause the session control device to perform the steps performed by the session control device in a PDN connection method as provided in the first aspect and any one of its possible designs.

In a fifth aspect, the present application provides a computer program product for, when run on a session control apparatus, causing the session control apparatus to perform the steps performed by the session control apparatus in a PDN connection method as provided in the first aspect and any one of its possible designs.

It may be appreciated that the advantages achieved by the technical solutions provided in the second aspect to the fifth aspect may refer to the advantages in the first aspect and any possible design manner thereof, and are not described herein.

Drawings

Fig. 1 is a schematic diagram of a PDN connection establishment flow provided in the prior art;

fig. 2 is a schematic structural diagram of a communication system according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a user terminal according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a server according to an embodiment of the present application;

fig. 5 is a schematic flow chart of a PDN connection method according to an embodiment of the present application;

fig. 6 is a schematic flow chart of another PDN connection method according to an embodiment of the present application;

fig. 7 is a schematic flow chart of another PDN connection method according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a session control device according to an embodiment of the present application;

Fig. 9 is a schematic structural diagram of a chip system according to an embodiment of the present application.

Detailed Description

The terminology used in the following embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates to the contrary. It should also be understood that "/" means or, e.g., A/B may represent A or B; the text "and/or" is merely an association relation describing the associated object, and indicates that three relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments.

The terms "first", "second" in the following embodiments of the present application are used for descriptive purposes only and are not to be construed as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature, and in the description of embodiments of the application, unless otherwise indicated, the meaning of "a plurality" is two or more.

First, the following description is given of terms related to the embodiments of the present application:

Non-access layer: non-access stratum, NAS for short. After layering the existing communication system (e.g., universal mobile telecommunications system (Universal Mobile Telecommunications System, UMTS)) in terms of the protocol stack, the NAS layer is the highest layer in the control plane. The non-access layer is used as a functional layer between the core network and the user terminal and supports signaling and data transmission between the core network and the user terminal. Specifically, the non-access stratum may support session management, where session management is related to EPS (evolved PACKET SYSTEM) bearers (or PDN bearers) obtained after the PDN connection is established successfully. That is, the user terminal needs to establish a PDN connection through the non-access stratum.

Based on the existing third generation partnership project (3GPP,3rd Generation Partnership Project), the user terminal must be accompanied by a Packet Data Network (PDN) connection establishment procedure (or PDN bearer establishment procedure) in the initial registration of the attached core Network. During the establishment of the PDN connection, the UE may establish the PDN connection through a non-access stratum (NAS).

Currently, there is a user service table (user service table, UST) stored in a user identity card (user identity module, UIM) issued by a part of operators, which requires a PDN connection (or may be referred to as a PDN bearer) setup session control (CC) capability established by a User Equipment (UE), and the PDN connection setup session control capability requires the NAS layer to interact with the UIM, so that the UIM determines whether the PDN connection can be established according to its own capability or the capability of the user equipment in which the UIM is located.

Illustratively, taking the communication system as an LTE (long term evolution ) system as an example, referring to fig. 1, a procedure for establishing a PDN connection in an existing NAS includes: when the user terminal is initially registered, a PDN bearing needs to be established, and then the user terminal sends a PDN connection request to the EMM device. Wherein the PDN connection request is used to request a confirmation of whether to establish a PDN connection. The PDN connection request may carry indication information. The indication information is specifically used for indicating whether the PDN connection needs to establish session control capability.

After receiving the PDN connection request from the user terminal, the EMM device sends the PDN connection request to the CC device through the ESM device.

After receiving the PDN connection request, the CC device determines a processing manner according to the specific content of the indication information carried in the PDN connection request.

Specifically, in the case that the indication information indicates the PDN connection establishment session control capability, the CC device may send an ENVELOPE signaling to the UIM in the user terminal, so that the UIM determines whether the PDN connection can be established. In fig. 1, the UIM is a part of a user terminal, and the UIM and the user terminal are separated for convenience of illustration only, and in practice, the UIM should be located in the user terminal.

If the UIM determines that the PDN connection can be established, an ENVELOPE response is returned to the CC device. The ENVELOPE response may then be used to indicate that the PDN connection may be established. The CC device may then send a PDN connection response to the ESM device. The PDN connection response is used to indicate that a PDN connection may be established. The ESM device may then send the DPN connection response to the user terminal via the EMM device, so that the user terminal normally establishes a PDN connection.

If the UIM determines that the PDN connection can not be established, a rejection response is returned to the CC device. The rejection response may then be used to indicate that the PDN connection may not be established. The CC device may then return the rejection response to the user terminal via the ESM device and EMM device in sequence. And the user terminal can resend the PDN connection request to the EMM according to the fault reason carried in the block response.

In case the indication information indicates that the PDN connection does not establish session control capability, the CC device does not send an ENVELOPE signaling to the UIM in the user terminal, but returns a PDN connection response directly to the ESM device. And then the ESM device returns a PDN connection response to the user terminal through the EMM device so that the user terminal can normally establish PDN connection.

It can be seen that, in the existing technical solution, if the UST in the UIM of the user terminal requires the session control capability for the PDN connection established by the user terminal in the process that the user terminal establishes the PDN connection through the NAS, the NAS needs to interact with the UIM. However, if the UIM is blocked for a number of possible reasons, the NAS needs to interact with the UIM, the UIM will not be able to complete the interaction with the NAS. In this way, the PDN connection cannot be established, and the UE cannot normally access the internet, which seriously affects the user experience.

Aiming at the problems, the embodiment of the application provides a PDN connection method. In the scheme, even if UST in UIM of the user terminal requires the PDN connection establishment session control capability established by the user terminal, NAS equipment does not interact with the UIM, but directly returns a response capable of establishing PDN connection to the user terminal, so that the user terminal normally establishes PDN connection, initial registration is completed, and user experience is ensured. And also avoids that the user terminal can not register smoothly or register into the older network with smaller bandwidth because of UIM blocking.

The PDN connection method provided by the embodiment of the application is described below with reference to the accompanying drawings.

The PDN connection method provided by the embodiment of the application can be applied to the communication system shown in the figure 2. Referring to fig. 2, the communication system may include a NAS device 01 and a user terminal 02. A network connection may be established between the NAS device and the user terminal.

The user terminal 02 is provided with a UIM, in which a UST exists, and in which a PDN connection indicating whether the session control capability is established for the user terminal is stored. The ue 02 may send a PDN connection request to the NAS device when initially registering to the network, where the request may carry indication information, where the indication information is used to indicate whether the PDN connection needs to establish a session control capability.

Taking the LTE system as an example of the communication system, referring to fig. 2, the NAS device 01 may include a management apparatus 21 and a CC apparatus 22. The management device 21 may include an EMM sub-device 211 and an ESM device 212.EMM sub-device 211 is primarily used to provide mobility management services for evolved packet system PDN bearers (i.e. bearers established after a PDN connection is successful), while EMM sub-device is also used to provide connection management services for ESM sub-devices. The ESM sub-device 212 is mainly used for providing session management services for PDN bearers, i.e. is mainly responsible for handling PDN bearer contexts at the user terminal and network side. The CC device 22 is configured to implement session control, i.e. determine whether interaction with the UIM is required to determine whether a PDN bearer can be established.

By way of example, in some embodiments, the user terminal may be a mobile phone, a tablet computer, a handheld computer, a personal computer (personal computer, PC), an ultra-mobile personal computer (UMPC), a netbook, a cellular phone, a Personal Digital Assistant (PDA), an augmented reality (augmented reality, AR) device, a Virtual Reality (VR) device, an artificial intelligence (ARTIFICIAL INTELLIGENCE, AI) device, a wearable device, a vehicle-mounted device, a smart home device, and/or a smart city device, which are provided with a call function, and the specific type of the user terminal is not particularly limited according to the embodiments of the present application.

Taking a user terminal as an example of a mobile phone, fig. 3 shows a schematic structural diagram of the user terminal according to an embodiment of the present application.

As shown in fig. 3, the user terminal may include a processor 210, an external memory interface 220, an internal memory 221, a universal serial bus (universal serial bus, USB) interface 230, a charge management module 240, a power management module 241, a battery 242, an antenna 1, an antenna 2, a mobile communication module 250, a wireless communication module 260, an audio module 270, a speaker 270A, a receiver 270B, a microphone 270C, an earphone interface 270D, a sensor module 280, keys 290, a motor 291, an indicator 292, a display 294, a subscriber identity module (subscriber identification module, SIM) card interface 295, and the like. The sensor module 280 may include, among other things, a pressure sensor 280A, a gyroscope sensor 280B, a barometric sensor 280C, a magnetic sensor 280D, an acceleration sensor 280E, a distance sensor 280F, a proximity sensor 280G, a fingerprint sensor 280H, a temperature sensor 280J, a touch sensor 280K, an ambient light sensor 280L, a bone conduction sensor 280M, and the like.

Processor 210 may include one or more processing units such as, for example: processor 210 may include an application processor (application processor, AP), a modem processor, a graphics processor (graphics processing unit, GPU), an image signal processor (IMAGE SIGNAL processor, ISP), a controller, a memory, a video codec, a digital signal processor (DIGITAL SIGNAL processor, DSP), a baseband processor, and/or a neural Network Processor (NPU), etc. Wherein the different processing units may be separate devices or may be integrated in one or more processors.

The controller may be a neural hub and a command center of the user terminal. The controller can generate operation control signals according to the instruction operation codes and the time sequence signals to finish the control of instruction fetching and instruction execution.

A memory may also be provided in the processor 210 for storing instructions and data. In some embodiments, the memory in the processor 210 is a cache memory. The memory may hold instructions or data that the processor 210 has just used or recycled. If the processor 210 needs to reuse the instruction or data, it may be called directly from the memory. Repeated accesses are avoided and the latency of the processor 210 is reduced, thereby improving the efficiency of the system.

In some embodiments, processor 210 may include one or more interfaces. The interfaces may include an integrated circuit (inter-INTEGRATED CIRCUIT, I2C) interface, an integrated circuit built-in audio (inter-INTEGRATED CIRCUIT SOUND, I2S) interface, a pulse code modulation (pulse code modulation, PCM) interface, a universal asynchronous receiver transmitter (universal asynchronous receiver/transmitter, UART) interface, a mobile industry processor interface (mobile industry processor interface, MIPI), a general-purpose input/output (GPIO) interface, a subscriber identity module (subscriber identity module, SIM) interface, and/or a universal serial bus (universal serial bus, USB) interface, among others.

The external memory interface 220 may be used to connect to an external non-volatile memory to enable expansion of the memory capabilities of the user terminal. The external nonvolatile memory communicates with the processor 110 through the external memory interface 120 to implement a data storage function. For example, files such as music and video are stored in an external nonvolatile memory.

The internal memory 221 may include one or more random access memories (random access memory, RAM) and one or more non-volatile memories (NVM). The random access memory may be read directly from and written to by the processor 110, may be used to store executable programs (e.g., machine instructions) for an operating system or other on-the-fly programs, may also be used to store data for users and applications, and the like. The nonvolatile memory may store executable programs, store data of users and applications, and the like, and may be loaded into the random access memory in advance for the processor 110 to directly read and write.

In some embodiments, the user terminal may include 1 or N cameras 293, N being a positive integer greater than 1. In the embodiment of the present application, the type of the camera 293 may be differentiated according to the hardware configuration and the physical location.

The user terminal implements display functions through the GPU, the display screen 294, and the application processor, etc. The GPU is a microprocessor for image editing, and is connected to the display screen 294 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. Processor 210 may include one or more GPUs that execute program instructions to generate or change display information.

The user terminal may implement a photographing function through the ISP, the camera 293, the video codec, the GPU, the display 294, the application processor, and the like.

The display 294 is used to display images, videos, and the like. The display 294 includes a display panel. The display panel may employ a Liquid Crystal Display (LCD) screen (liquid CRYSTAL DISPLAY), an organic light-emitting diode (OLED), an active-matrix organic LIGHT EMITTING diode (AMOLED), a flexible light-emitting diode (flex), miniled, microLed, micro-OLED, quantum dot LIGHT EMITTING diodes (QLED), or the like. In some embodiments, the user terminal may include 1 or N displays 294, N being a positive integer greater than 1.

The charge management module 240 is configured to receive a charge input from a charger. The charger can be a wireless charger or a wired charger.

The power management module 241 is used for connecting the battery 242, and the charge management module 240 and the processor 210. The power management module 241 receives input from the battery 242 and/or the charge management module 240 and provides power to the processor 210, the internal memory 521, the display 294, the camera 293, the wireless communication module 260, and the like.

The wireless communication function of the user terminal may be implemented by the antenna 1, the antenna 2, the mobile communication module 250, the wireless communication module 260, the modem, the baseband processor, and the like.

The antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in the user terminal may be used to cover a single or multiple communication bands. Different antennas may also be multiplexed to improve the utilization of the antennas.

The mobile communication module 250 may provide a solution for wireless communication including 2G/3G/4G/5G or the like applied on the user terminal.

The wireless communication module 260 may provide solutions for wireless communication including wireless local area network (wireless local area networks, WLAN) applied on a user terminal (e.g., wireless fidelity (WIRELESS FIDELITY, wi-Fi) network), bluetooth (bl user terminal bluetooth, BT), global navigation satellite system (global navigation SATELLITE SYSTEM, GNSS), frequency modulation (freq user terminal ncy modulation, FM), near field communication technology (NEAR FIELD communication, NFC), infrared technology (IR), etc.

The wireless communication module 260 may be one or more devices that integrate at least one communication processing module. The wireless communication module 260 receives electromagnetic waves via the antenna 2, modulates the electromagnetic wave signals, filters the electromagnetic wave signals, and transmits the processed signals to the processor 210. The wireless communication module 260 may also receive a signal to be transmitted from the processor 210, frequency modulate it, amplify it, and convert it to electromagnetic waves for radiation via the antenna 2.

The SIM card interface 295 is for connection to a SIM card (one type of UIM). The SIM card may be contacted and separated from the user terminal by being inserted into the SIM card interface 295 or by being withdrawn from the SIM card interface 295. The user terminal may support one or more SIM card interfaces. The SIM card interface 295 may support Nano SIM cards, micro SIM cards, USIM cards, UIM cards, and the like. The same SIM card interface 295 may be used to insert multiple cards simultaneously. The SIM card interface 295 may also be compatible with external memory cards. The user terminal finishes registering to network through the SIM card, and interacts with the network after the registering is successful, thereby realizing the functions of communication, data communication and the like. In the embodiment of the application, the SIM card can store a UST, and the UST stores a session control capability for indicating whether the PDN connection established by the user terminal is established.

It will be understood, of course, that the illustration of fig. 3 is merely exemplary of the case where the user terminal is in the form of a mobile phone. If the user terminal is a tablet computer, a handheld computer, a PC, a PDA, a wearable device (such as a smart watch, a smart bracelet), etc., the structure of the user terminal may include fewer structures than those shown in fig. 3, or may include more structures than those shown in fig. 3, which is not limited herein.

Illustratively, EMM sub-device 211, ESM device 212, and CC device in embodiments of the present application may each be a server with certain storage and processing capabilities. Of course, EMM sub-device 211, ESM device 212, and CC device may be separate servers, may be different parts on the same server, or any two devices may be different parts in one server, and the other device may be another server or a part of another server, which is not particularly limited in this aspect of the present application. In the case where EMM sub-device 211, ESM device 212, and CC device belong to a plurality of servers, the plurality of servers communicate with each other by wired or wireless communication.

By way of example, the server may be structured as shown in fig. 4, and the server may include a memory 101, a processor 102, a bus 103, and a communication interface 104; the memory 101 is used for storing computer-executable instructions, and the processor 102 is connected with the memory 101 through the bus 103; when the access network device is running, the processor 102 executes computer-executable instructions stored in the memory 101 to cause the user terminal to perform the radio frame determination method as provided in the above embodiments.

In a particular implementation, as one embodiment, the processors 102 (102-1 and 102-2) may include one or more CPUs, such as CPU0 and CPU1 shown in FIG. 4. And as one example a user terminal may include multiple processors 102, such as processor 102-1 and processor 102-2 shown in fig. 4. Each of these processors 102 may be a Single-core processor (Single-CPU) or a Multi-core processor (Multi-CPU). The processor 102 herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

The Memory 101 may be, but is not limited to, a Read-Only Memory 101 (ROM) or other type of static storage device that can store static information and instructions, a random access Memory (random access Memory, RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable Read-Only Memory (ELECTRICALLY ERASABLE PROGRAMMABLE READ-Only Memory, EEPROM), a compact disc Read-Only Memory (compact disc Read-Only Memory) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 101 may be stand alone and coupled to the processor 102 via a bus 103. Memory 101 may also be integrated with processor 102.

In a specific implementation, the memory 101 is configured to store data in the present application and computer-executable instructions corresponding to a software program for executing the present application. The processor 102 may implement various functions of the user terminal by running or executing software programs stored in the memory 101 and invoking data stored in the memory 101.

The communication interface 104 uses any transceiver-like means for communicating with other devices or communication networks, such as a control system, a radio access network (radio access network, RAN), a wireless local area network (wireless local area networks, WLAN), etc. The communication interface 104 may include a receiving unit to implement a receiving function and a transmitting unit to implement a transmitting function.

Bus 103 may be an industry standard architecture (industry standard architecture, ISA) bus, an external device interconnect (PERIPHERAL COMPONENT INTERCONNECT, PCI) bus, or an extended industry standard architecture (extended industry standard architecture, EISA) bus, among others. The bus 103 may be classified as an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in fig. 4, but not only one bus or one type of bus.

Based on the software architecture shown in fig. 2 to fig. 4, the PDN connection method provided by the embodiment of the present application is described in detail below with reference to fig. 5. Fig. 5 is a schematic flow chart of a PDN connection method according to an embodiment of the present application. Referring to fig. 5, taking a communication system as an LTE system as an example, the PDN connection method may include S501-S504:

s501, the user terminal sends a PDN connection request to the NAS device.

For example, the ue may switch from the flight mode back to the normal mode or from the no-network state to the network state after power-on, and after the ue requests channel resources from the base station, i.e. after a signaling path is established based on an Access Stratum (AS). Based on the signaling pathway, the user terminal may send a PDN connection request to the NAS device to complete the initial registration and attach to the core network. The NAS device may be located in an MME (mobility MANAGEMENT ENTITY )/AMF (ACCESS AND mobility management function, access and mobility management function) of the core network, where the NAS may be considered as a signaling interaction between the user terminal and the MME/AMF.

The PDN connection establishment request is used for requesting to confirm whether to establish PDN connection or not; the PDN connection request carries indication information. The indication information is used to indicate whether the PDN connection establishes session control capability.

In one possible design manner, the indication information may be a flag bit, where the indication information is used to indicate a PDN connection establishment session control capability when the flag bit is a first preset value; and under the condition that the flag bit is a second preset value, the indication information is used for indicating that the PDN connection does not establish session control capability. For example, when the flag bit is "0", the indication information is used to indicate that the PDN connection establishes the session control capability, and when the flag bit is "1", the indication information is used to indicate that the PDN connection does not establish the session control capability.

S502, the NAS equipment receives a PDN connection request from the user terminal.

S503, the NAS equipment returns a PDN connection response to the user terminal under the condition that the indication information in the PDN connection request is used for indicating the PDN connection establishment session control capability.

Wherein the PDN connection response is used to indicate that a PDN connection is established.

It should be noted that, when the NAS device receives the PDN connection request and determines that the indication information is used to indicate the PDN connection establishment session control capability, according to the communication system, the NAS device may also interact with any other possible network element device according to the PSN connection request to determine that a PDN connection may be established, so as to return a PDN connection response to the user terminal.

In addition, under the condition that the indication information is used for indicating that the PDN connection does not establish session control capability, the NAS equipment returns a PDN connection response to the user terminal; the PDN connection response is used to indicate that a PDN connection is established.

In this way, no matter whether the indication information in the PDN connection request of the user terminal indicates connection establishment or no session control capability is established, the NAS device does not interact with the UIM in the user terminal, but directly returns a connection response to the user terminal, so that the user terminal successfully establishes the PDN connection. The PDN connection is quickly established by the user terminal, and the use experience of the user is ensured.

In addition, based on the technical scheme, it can be known that in the communication system as shown in fig. 2 provided by the present application: the NAS device is further used for returning a PDN connection response to the user terminal under the condition that the indication information is used for indicating that the PDN connection does not establish session control capability; the PDN connection response is used to indicate that a PDN connection is established.

S504, the user terminal receives the PDN connection response from the NAS device.

After the user terminal receives the PDN response, the user terminal can normally establish PDN connection. Specifically, after receiving the PDN connection response, the user terminal may continue to perform initial registration, so as to complete attachment to the network.

In addition, it should be noted that, according to the technical solution provided by the embodiment of the present application, since the NAS device does not interact with the UIM to determine whether to establish the PDN connection, the security is not high enough. Based on the above, the technical solution provided by the embodiment of the present application should be applied to a communication system of an operator that can determine with high probability that there is no security problem. Of course, if the safety problem is not considered, the technical scheme provided by the application can be applied to any possible communication system.

Based on the technical proposal provided by the application, in the process of establishing PDN connection in the initial registration network access of the user terminal, NAS equipment firstly receives the PDN connection request of the user terminal. After that, even if the user terminal requests the user terminal to establish the PDN bearer establishment session control capability due to the UST in the UIM card, the indication information carried in the PDN connection request sent by the user terminal to the NAS device indicates the PDN connection establishment session control capability. The NAS device does not interact with the UIM in the user terminal, but returns a connection response to the user terminal, so that the user terminal successfully establishes the PDN connection. Therefore, the PDN connection cannot be normally established by the user terminal due to the blocking problem of the UIM, and the use experience of the user is ensured.

In addition, based on the technical scheme shown in fig. 5, it can be known that in the communication system shown in fig. 2 provided by the present application: a non-access stratum NAS device, configured to receive a PDN connection request from a user terminal; the PDN connection establishment request is used for requesting to confirm whether to establish the PDN connection; the PDN connection request carries indication information; the NAS device is further used for returning a PDN connection response to the user terminal under the condition that the indication information is used for indicating the PDN connection establishment session control capability; the PDN connection response is used to indicate that a PDN connection is established.

In some embodiments, as shown in connection with fig. 2, in the communication system, the NAS device may include a management apparatus and a CC apparatus for implementing session control. Based on this, referring to fig. 6 in conjunction with fig. 5, S502 may include S502A and S503 may include S601-S604.

S502A, the management device receives a PDN connection request from the user terminal.

S601, the management device sends a PDN connection request to the CC device.

S602, the CC device receives a PDN connection request from the management device, and responds to the PDN connection request, and sends a PDN connection response to the management device under the condition that the indication information is used for indicating the PDN connection establishment session control capability.

Illustratively, in some embodiments, the CC device may be a CM (connection management ) device.

And S603, the management device receives the PDN connection response from the CC device.

S604, the management device sends a PDN connection response to the user terminal.

Based on the technical scheme, the management device in the NAS equipment can transmit the PDN connection request of the user terminal to the CC device for processing, and the CC device directly sends PDN connection response to the user terminal through the management device under the condition that the indication information in the PDN request indicates that the PDN connection needs to establish session control capability, so that the user terminal smoothly establishes the PDN connection, and the use experience of a user is ensured.

In addition, based on the technical scheme shown in fig. 6, it can be known that in the communication system shown in fig. 2 provided by the present application: a management device for receiving a PDN connection request from a user terminal; the management device is also used for sending a PDN connection request to the CC device; CC means for transmitting a PDN connection response to the management means in response to the PDN connection request from the management means, in the case that the indication information is used to indicate PDN connection establishment session control capability; the management means is also for sending a PDN connection response from the CC means to the user terminal.

In some embodiments, as shown in connection with fig. 2, in the communication system, the management device includes an EMM sub-device and an ESM sub-device, where the EMM sub-device is mainly used to provide mobility management services for the PDN bearer of the evolved packet system, and the EMM sub-device is also used to provide connection management services for the ESM sub-device. That is, the ESM subassembly needs to acquire signaling sent by the user terminal to the NAS from the EMM subassembly. The ESM sub-device is mainly used for providing session management service for PDN bearer, i.e. is mainly responsible for handling PDN bearer context of the user terminal and the network side. Based on this, referring to fig. 7 in conjunction with fig. 6, S502A is replaced with S502B in particular, S601 may include S6011-S6013 in particular, S602 may include S6021-S6023, S603 may be replaced with S603A, S604 may be replaced with S604A, and S504 may be replaced with S504A.

The S502B, EMM sub-device receives a PDN connection request from the user terminal.

S6011, EMM sub-device sends PDN connection request to ESM sub-device.

Illustratively, the PDN request sent by the EMM sub-device to the ESM sub-device may be: nas_esm_get_pdn_connection_req.

S6012, ESM sub-device receives PDN connection request from EMM sub-device.

S6013, the ESM sub-device sends a PDN connection request to the CC device.

Illustratively, the PDN request sent by the ESM sub-device to the CC device may be: mm_cm_get_pdn_connection_request_ind.

Based on S6011-S6013, the EMM sub-device may send a PDN connection request to the CC device through the ESM sub-device.

S6021, the CC device receives the PDN connection request from the ESM sub-device, and in response to the PDN connection request, sends a PDN connection response to the ESM sub-device if the indication information is used to indicate a PDN connection establishment session control capability.

The S6022, ESM sub-device receives a PDN connection response from the CC device.

S6023, the ESM sub-device transmits a PDN connection response to the EMM sub-device.

Based on the above S6021-S6023, the CC apparatus responds to the PDN connection request, and in case the indication information is used to indicate the PDN connection establishment session control capability, may send a PDN connection response to the EMM sub-apparatus through the ESM sub-apparatus.

The S603A, EMM sub-device receives a PDN connection response from the ESM sub-device.

The S604A, EMM sub-device sends a PDN connection response to the user terminal.

S504A, the user terminal receives a PDN connection response from the EMM sub-device.

In addition, based on the technical scheme shown in fig. 7, it can be known that in the communication system shown in fig. 2 provided by the present application: EMM sub-means for receiving a packet data network PDN connection request from a user terminal; the EMM sub-device is further configured to send a PDN connection request to the CC device through the ESM sub-device; the CC device is specifically configured to: responding to the PDN connection request, and sending a PDN connection response to the EMM sub-device through the ESM sub-device under the condition that the indication information is used for indicating the PDN connection establishment session control capability; the EMM sub-means is also for sending a PDN connection response to the user terminal

It will be appreciated that, in order to implement the above functions, the devices in the NAS device include corresponding hardware structures and/or software modules that perform the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven 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 embodiments of the present application.

Referring to fig. 8, the embodiment of the application also provides a session control device, which is applied to NAS equipment, wherein the NAS equipment comprises a management device and the session control device. The session control device comprises a receiving module 81, a processing module 82 and a sending module 83.

Specifically, the receiving module 81 is configured to receive a PDN connection request from the management apparatus; the PDN connection request is used for requesting to confirm whether PDN connection is established or not; the PDN connection request carries indication information; the PDN connection request is sent by the user terminal to the management apparatus. The processing module 82 is configured to, in response to the PDN connection request received by the receiving module 81, control the sending module 83 to send a PDN connection response to the management device, so that the management device sends the PDN connection response to the user terminal, where the indication information in the PDN connection request indicates that the PDN connection has established a session control capability; the PDN connection response is used to indicate that a PDN connection is established.

In some embodiments, the processing module 82 is further to: in response to the PDN connection request received by the receiving module 81, in a case where the indication information in the PDN connection request indicates that the PDN connection does not establish the session control capability, the control sending module 83 sends a PDN connection response to the management apparatus, so that the management apparatus sends the PDN connection response to the user terminal.

The session control device provided by the embodiment of the present application is mainly used for executing the PDN connection method provided by the foregoing embodiment, so the corresponding beneficial effects thereof may be described with reference to the foregoing embodiment, and will not be described herein again.

The embodiment of the application also provides electronic equipment, which comprises: a memory and one or more processors; the memory is coupled with the processor; wherein the memory stores computer program code comprising computer instructions that, when executed by the processor, cause the electronic device to perform steps performed by the NAS device or steps performed by any apparatus in the NAS device in a PDN connection method as provided in the foregoing embodiments.

The embodiment of the present application also provides a chip system, as shown in fig. 9, the chip system 900 includes at least one processor 901 and at least one interface circuit 902. The processor 901 and the interface circuit 902 may be interconnected by wires. For example, the interface circuit 902 may be used to receive signals from other devices (e.g., a memory of an electronic apparatus). For another example, interface circuit 102 may be used to send signals to other devices (e.g., processor 901).

The interface circuit 902 may, for example, read instructions stored in a memory and send the instructions to the processor 901. The instructions, when executed by the processor 901, may cause the electronic device to perform the various steps of the embodiments described above. Of course, the system-on-chip may also include other discrete devices, which are not particularly limited in accordance with embodiments of the present application.

The embodiment of the application also provides a computer readable storage medium, which includes computer instructions that, when executed on an electronic device, cause the electronic device to perform steps performed by the NAS device or steps performed by any apparatus in the NAS device in the PDN connection method provided in the foregoing embodiment.

Embodiments of the present application also provide a computer program product containing executable instructions that, when run on an electronic device, cause the electronic device to perform steps performed by a NAS device or steps performed by any apparatus in a NAS device in a PDN connection method as provided in the foregoing embodiments.

It will be apparent to those skilled in the art from this description that, for convenience and brevity of description, only the above-described division of the functional modules is illustrated, and in practical application, the above-described functional allocation may be performed by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to perform all or part of the functions described above.

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another apparatus, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and the parts shown as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions for causing a device (may be a single-chip microcomputer, a chip or the like) or a processor (processor) to execute all or part of the methods of 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 (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely illustrative of specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims

1. A PDN connection method, comprising:

the method comprises the steps that an evolved packet system mobility management EMM sends a first packet data network PDN connection request to a session control CC through an evolved packet system session management ESM, wherein the first PDN connection request carries first indication information, and the first indication information is used for indicating PDN connection establishment session control capability;

the CC responds to the first PDN connection request and sends a PDN connection response to the EMM through the ESM; the PDN connection response is used for indicating establishment of PDN connection;

wherein said EMM and said ESM belong to a NAS protocol layer.

2. The method of claim 1, wherein the CC does not send an envelope message to a user identity card UIM after the EMM sends the PDN connection request to the CC through the ESM and before the CC sends a PDN connection response to the EMM through the ESM.

3. The method according to claim 1 or 2, wherein the first indication information comprises a first flag bit, and the first flag bit is a first preset value.

4. The method according to claim 1 or 2, characterized in that the method further comprises:

The EMM sends a second PDN connection request to the CC through the ESM, wherein the second PDN connection request carries second indication information, and the second indication information is used for indicating that PDN connection does not establish session control capability;

the CC sends the PDN connection response to the EMM through the ESM in response to the second PDN connection request.

5. The method of claim 4, wherein the second indication information comprises a second flag bit, the second flag bit being a second preset value.

6. A terminal device, comprising: a memory and one or more processors; the memory is coupled with the processor; wherein the memory has stored therein computer program code comprising computer instructions which, when executed by the processor, cause the terminal device to perform the PDN connection method according to any of claims 1-5.

7. A computer readable storage medium, characterized in that the computer readable storage medium comprises computer instructions, which when run on a terminal device, cause the terminal device to perform the PDN connection method according to any of claims 1-5.