CN110167202B

CN110167202B - Session processing method, device, terminal and medium

Info

Publication number: CN110167202B
Application number: CN201910345412.1A
Authority: CN
Inventors: 刘旭
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2019-04-26
Filing date: 2019-04-26
Publication date: 2021-04-20
Anticipated expiration: 2039-04-26
Also published as: CN110167202A

Abstract

The embodiment of the invention discloses a session processing method, a session processing device, a session processing terminal and a session processing medium. The session processing method comprises the following steps: receiving a session release message sent by a session management functional entity; the session release message comprises a back-off time value and identification information, and the identification information is used for indicating that resources are insufficient; initiating a session establishment request through available resources under the condition that the back-off time value is greater than a preset threshold value; wherein the available resources are unoccupied network resources. The embodiment of the invention can solve the problem of session failure under the condition of insufficient network resources.

Description

Session processing method, device, terminal and medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a session processing method, an apparatus, a terminal, and a medium.

Background

At present, a fifth generation mobile communication technology (5th-generation, 5G) network sends a session release message to a terminal when resources are insufficient, where the message is used to limit the terminal from initiating an effective session establishment request or session modification request, so that a user cannot obtain a service through a session when resources are insufficient. In this case, the user wants to establish a session or modify the session, and the session is rejected by the 5G network, which further causes the user to fail to initiate a call, and reduces the user experience.

Disclosure of Invention

Embodiments of the present invention provide a session processing method, an apparatus, a terminal, and a medium, so as to solve a problem of session failure in a situation where resources are insufficient in a network.

In a first aspect, an embodiment of the present invention provides a session management method, where the session management method includes: receiving a Session release message sent by a Session Management Function (SMF); the session release message comprises a back-off time value and identification information, and the identification information is used for indicating that resources are insufficient; initiating a session establishment request through available resources under the condition that the back-off time value is greater than a preset threshold value; wherein the available resources are unoccupied network resources.

In a second aspect, an embodiment of the present invention provides a session processing apparatus, where the session processing apparatus includes: a receiving module, configured to receive a session release message sent by a session management function entity SMF; the session release message comprises a back-off time value and identification information, and the identification information is used for indicating that resources are insufficient; the initiating module is used for initiating a session establishment request through the available resources under the condition that the back-off time value is greater than a preset threshold value; wherein the available resources are unoccupied network resources.

In a third aspect, an embodiment of the present invention provides a terminal, including a processor, a memory, and a computer program stored on the memory and executable on the processor, where the computer program, when executed by the processor, implements the method according to the first aspect in the foregoing embodiments.

In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when executed by a processor, the computer program implements the method according to the first aspect in the foregoing embodiments.

According to the embodiment of the invention, under the condition that the back-off time value is greater than the preset threshold value, the waiting for the back-off time value is finished through the back-off time value included in the session release message and the identification information used for indicating that the resources are insufficient, and the session establishment request is reinitiated through the available resources, so that the continuous session service can be realized, and the user experience is improved.

Drawings

The present invention will be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters designate like or similar features.

Fig. 1 is a flowchart of a session processing method according to an embodiment of the present invention;

FIG. 2 is a flow chart of another session processing method according to an embodiment of the present invention;

FIG. 3 is a diagram illustrating a session processing apparatus according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a hardware structure of a terminal according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. 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 invention.

Fig. 1 is a flowchart of a session processing method according to an embodiment of the present invention. The session processing method is applied to the terminal and can comprise the following steps:

step 101: a terminal receives a Session release message sent by a Session Management Function (SMF); the session release message comprises a back-off time value and identification information, wherein the identification information is used for indicating that resources are insufficient (insufficient resources);

specifically, under the condition that resources are insufficient, the SMF sends a Protocol Data Unit (PDU) SESSION RELEASE message (SESSION RELEASE COMMAND) to the terminal, where the SESSION RELEASE message carries a Backoff time value (Backoff time), the Backoff time value is generally not 0, and the Backoff time is used to indicate that the terminal cannot initiate a PDU SESSION establishment request or a SESSION modification request on the same Data Network Name (DNN) within the Backoff time; in addition, the session release message also carries identification information for indicating that the resources are insufficient.

Step 102: the terminal compares the back-off time value with a preset threshold value;

in the embodiment of the invention, considering that the terminal cannot acquire any service through the PDU session in the Backoff time, especially under the condition that the value of the Backoff time is large, the experience of a user is not good; in order to solve the problem of poor user experience, the experience degree of a user is reduced by determining the condition of the terminal for waiting for the expiration of the Backoff time through a preset threshold value; and before the backoff expires, a session establishment request is initiated through available resources, so that the problem of long-time waiting of a user is avoided, and the user experience is improved. The preset threshold value is time within which the user cannot perceive waiting, so that the problem of poor user experience does not exist.

Step 103: under the condition that the back-off time value is larger than a preset threshold value, finishing waiting the back-off time value, and initiating a session establishment request through available resources; wherein the available resources are unoccupied network resources.

In step S102, it is mentioned that the Backoff time is greater than the preset threshold, which may affect the user experience because the user waiting time is too long. Then step 103 is to end waiting for the Backoff time before the Backoff time expires, and initiate a session establishment request through the available resources, thereby improving user experience.

In the embodiment of the present invention, the initiating a session establishment request through an unoccupied network resource in step 103 includes the following situations:

in the first case: the unoccupied network resources are network resources of the second network.

Specifically, switching from a first network where the current network is located to a second network; in the second network, a session establishment request is initiated using network resources of the second network.

In the second network, after initiating the session establishment request, if the back-off time value expires and the working mode is the idle mode, switching back to the first network.

Specifically, after step 102, a timing device of the terminal is started, and the period of the timing device is backoff time, for example, a timer; and switching back to the first network when the Backoff time expires, namely the timer is overtime, and the working mode of the terminal is idle mode.

In the second case: the unoccupied network resources are specific slice resources.

The identification information is first identification information, and the first identification information is used for indicating that a specific slice resource is insufficient (instant resources for specific slice);

specifically, the terminal determines an available Single Network Slice Selection Assistance Information (S-NSSAI) resource; initiating a session establishment request based on available S-NSSAI resources; wherein the available S-NSSAI resources are used to indicate the particular slice resources available.

In the embodiment of the present invention, before initiating the session establishment request based on the available S-NSSAI resource, the method further includes: judging whether available S-NSSAI resources exist or not; if the available S-NSSAI resources do not exist, switching from the first network where the S-NSSAI resources are currently located to a second network; in the second network, a session establishment request is initiated.

In the third case: unoccupied network resources are specific slices and available DNN resources.

The identification information is second identification information, and the second identification information is used for indicating that specific slice resources and DNN resources are insufficient (insufficient resources for specific slice and DNN);

specifically, the terminal determines available S-NSSAI resources and available DNN resources; wherein the available S-NSSAI resources are used to indicate available specific slice resources; and initiates a session setup request based on the available S-NSSAI resources and the available DNN resources.

Before initiating a session establishment request based on available S-NSSAI resources and available DNN resources, the embodiment of the present invention further includes: judging whether available S-NSSAI resources and available DNN resources exist at the same time, and if the available S-NSSAI resources and the available DNN resources do not exist, switching from the current first network to the second network; in the second network, a session establishment request is initiated. Wherein, the specific slice resource is a network slice.

Specifically, after step 102, a timing device of the terminal is started, with a period of Backoff time, e.g., a timer; and switching back to the first network when the Backoff time expires, namely the timer is overtime, and the working mode of the terminal is idle mode.

It should be noted that, after the handover to the second network, the available resource of the second network is used to initiate the session establishment request; when the Backoff time expires and the operation mode of the terminal is the idle mode, the network is switched back to the first network. And the switching between the first network and the second network is very quick, so that the user cannot be aware of the sudden change of the network, and the user experience is improved.

In the embodiment of the invention, if the Backoff time is less than or equal to the preset threshold value, the session establishment request is restarted after the Backoff time expires, namely the timer times out.

It should be noted that, when the Backoff time is relatively small, the session establishment request may be reinitiated by using the original DNN after the Backoff time expires; where the original DNN is used to establish a session that is released due to insufficient resources.

The purpose of using an unoccupied network is to serve the session on an ongoing basis. Therefore, the scope of the embodiments of the present invention can be encompassed as long as the above-described object is achieved.

According to the embodiment of the invention, under the condition that the back-off time value is greater than the preset threshold value, the waiting for the back-off time value is finished through the back-off time value included in the session release message and the identification information used for indicating that the resources are insufficient, and the session establishment request is reinitiated through the available resources, so that the continuous session service is ensured, and the user experience is improved.

In the embodiment of the present invention, the first network and the second network are both currently used, the first network may be a fifth Generation mobile communication technology (5-Generation, 5G), and the second network may be one of a fourth Generation mobile communication technology (4-Generation, 4G), a third Generation mobile communication technology (3-Generation, 3G), or a second Generation mobile communication technology (2-Generation, 2G).

Before switching 5G to 4G, 3G or 2G, the terminal may prioritize the 4G with higher priority, and after the priority is considered, the terminal may select a network to switch to both of the priority and the network state in consideration of the network condition.

The following explains how to solve the problem of session failure in the case of insufficient 5G resources, by means of 5G (first network) and 4G (second network).

By utilizing the embodiment of the invention, when the 5G network resources are insufficient and the Backoff time is greater than the preset threshold value, the session establishment request is initiated through the available resources, so that the problem of session failure of the network under the condition of insufficient resources is solved.

Fig. 2 is a flowchart of another session processing method according to an embodiment of the present invention. As shown in fig. 2, the session processing method includes:

step 201: the terminal receives a session release message sent by the SMF, wherein the session release message comprises a Backoff time and identification information, and the identification information is used for indicating that 5G resources are insufficient;

step 202: the terminal compares whether the Backoff time is greater than or equal to a preset threshold value; when the Backoff time is less than or equal to the threshold, executing step 203; when the Backoff time is greater than the threshold, steps 204, 205, and 206 are performed;

step 203: after waiting for the timer to time out (at this time, the period of the timer is Backoff time), establishing a PDU session establishment request;

it should be noted that, when the Backoff time is relatively small, the session establishment request may be reinitiated by using the original DNN after the Backoff time expires; the original DNN is used to establish sessions that are released due to insufficient resources.

Step 204: the terminal performs inter-rat selection again and switches from 5G to 4G.

And after the Backoff time expires and the working mode of the terminal is idle state, switching to 5GC and continuing to use the 5G service.

Specifically, the method comprises the following steps: selecting to be connected to an Evolved Packet Core Network (EPC) to acquire services, and switching to a 5GC (gas chromatography) to continue to use the 5G services after a Backoff time expires and the working mode of the terminal is idle. The user can continue to use the service, and the terminal automatically switches back to the 5G after the 5G network is recovered.

It should be noted that, in the 4G network, a session establishment request of an Access Point Name (APN) is initiated, and thus, under the condition that 5G network resources are insufficient, a user can still continue to establish a session.

Step 205: when the identification information is instant resources for specific slice and DNN, the terminal replaces S-NSSAI resources and DNN resources and initiates PDU session establishment requests of other DNN (different from the original DNN).

Step 206: and when the identification information is instant resources for specific slice, the terminal replaces S-NSSAI resources and initiates the original PDU session establishment request of DNN.

It should be noted that, when the S-NSSAI resource given by the 5G system is insufficient, the terminal re-initiates a PDU session establishment request of a different DNN by replacing the available S-NSSAI resource, thereby re-acquiring the 5G service.

In the embodiment of the invention, when the 5G network resources are insufficient, the service continuity is obtained by selectively switching different systems or reinitiating PDU session establishment requests of different DNNs. The continuity of the user service and the adaptation of the network congestion condition are ensured.

Fig. 3 is a schematic diagram of a session processing apparatus according to an embodiment of the present invention. As shown in fig. 3, the session processing apparatus includes:

a receiving module 301, configured to receive a session release message sent by a session management function entity SMF; the session release message comprises a back-off time value and identification information, and the identification information is used for indicating that resources are insufficient;

a comparing module 302, configured to compare the backoff time value with a preset threshold;

the initiating module 303: initiating a session establishment request through available resources under the condition that the back-off time value is greater than a preset threshold value; wherein the available resources are unoccupied network resources.

According to the embodiment of the invention, the problem of session failure under the condition of insufficient resources of the network can be solved by the back-off time value included in the session release message and the identification information used for indicating the resource insufficiency, and the back-off time value is larger than the preset threshold value under the condition that the back-off time value is larger than the preset threshold value.

Optionally, the session processing apparatus further includes: a switching module;

the switching module is used for switching from a first network where the switching module is located to a second network;

the initiating module 303 is specifically configured to initiate a session establishment request in the second network.

Optionally, the switching module is further configured to switch back to the first network when the back-off time value expires and the working mode is an idle mode.

Optionally, the identification information is first identification information, and the first identification information is used to indicate that the specific slice resource is insufficient;

the initiating module 303 is specifically configured to: determining available S-NSSAI resources; wherein the available S-NSSAI resources are used to indicate the available specific slice resources;

a session establishment request is initiated based on the available S-NSSAI resources.

Optionally, the session processing apparatus further includes: the device comprises a judging module and a switching module;

the judging module is used for judging whether available S-NSSAI resources exist or not;

the switching module is used for switching from the first network to the second network under the condition that available S-NSSAI resources do not exist;

the initiating module 303 is specifically configured to: in the second network, a session establishment request is initiated.

Optionally, the identification information is second identification information, and the second identification information is used to indicate that the specific slice resource and the DNN resource are insufficient;

the initiating module 303 is specifically configured to: determining available S-NSSAI resources and available DNN resources; wherein the available S-NSSAI resources are used to indicate the available specific slice resources;

a session establishment request is initiated based on the available S-NSSAI resources and the available DNN resources.

a determination module configured to: judging whether available S-NSSAI resources and available DNN resources exist at the same time;

the switching module is used for switching from the current first network to the second network under the condition that available S-NSSAI resources and available DNN resources do not exist;

Optionally, the switching module is further configured to: and switching back to the first network when the back-off time value expires and the working mode is the idle mode.

The terminal provided by the embodiment of the present invention can implement each process implemented by the mobile terminal in the method embodiments of fig. 1 to fig. 2, and is not described herein again to avoid repetition.

Figure 4 is a schematic diagram of the hardware architecture of a terminal implementing various embodiments of the present invention,

the terminal 100 includes but is not limited to: radio frequency unit 101, network module 102, audio output unit 103, input unit 104, sensor 105, display unit 106, user input unit 107, interface unit 108, memory 109, processor 110, and power supply 111. Those skilled in the art will appreciate that the terminal configuration shown in fig. 4 is not intended to be limiting, and that the terminal may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.

A processor 110 configured to: receiving a session release message sent by a session management function entity (SMF); the session release message comprises a back-off time value and identification information, and the identification information is used for indicating that resources are insufficient; initiating a session establishment request through available resources under the condition that the back-off time value is greater than a preset threshold value; wherein the available resources are unoccupied network resources.

It should be understood that, in the embodiment of the present invention, the radio frequency unit 101 may be used for receiving and sending signals during a message transmission or call process, and specifically, after receiving downlink data from a base station, the downlink data is processed by the processor 110; in addition, the uplink data is transmitted to the base station. Typically, radio frequency unit 101 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 101 can also communicate with a network and other devices through a wireless communication system.

The terminal provides wireless broadband internet access to the user through the network module 102, such as helping the user send and receive e-mails, browse web pages, access streaming media, and the like.

The audio output unit 103 may convert audio data received by the radio frequency unit 101 or the network module 102 or stored in the memory 109 into an audio signal and output as sound. Also, the audio output unit 103 may also provide audio output related to a specific function performed by the terminal 100 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 103 includes a speaker, a buzzer, a receiver, and the like.

The input unit 104 is used to receive an audio or video signal. The input Unit 104 may include a Graphics Processing Unit (GPU) 1041 and a microphone 1042, and the Graphics processor 1041 processes image data of a still picture or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 106. The image frames processed by the graphic processor 1041 may be stored in the memory 109 (or other storage medium) or transmitted via the radio frequency unit 101 or the network module 102. The microphone 1042 may receive sound and may be capable of processing such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 101 in case of a phone call mode.

The terminal 100 also includes at least one sensor 105, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that can adjust the brightness of the display panel 1061 according to the brightness of ambient light, and a proximity sensor that can turn off the display panel 1061 and/or a backlight when the terminal 100 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the terminal posture (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration identification related functions (such as pedometer, tapping), and the like; the sensors 105 may also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., which are not described in detail herein.

The display unit 106 is used to display information input by a user or information provided to the user. The Display unit 106 may include a Display panel 1061, and the Display panel 1061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 107 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the terminal. Specifically, the user input unit 107 includes a touch panel 1071 and other input devices 1072. Touch panel 1071, also referred to as a touch screen, may collect touch operations by a user on or near the touch panel 1071 (e.g., operations by a user on or near touch panel 1071 using a finger, stylus, or any suitable object or attachment). The touch panel 1071 may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 110, and receives and executes commands sent by the processor 110. In addition, the touch panel 1071 may be implemented in various types, such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 1071, the user input unit 107 may include other input devices 1072. Specifically, other input devices 1072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein.

Further, the touch panel 1071 may be overlaid on the display panel 1061, and when the touch panel 1071 detects a touch operation thereon or nearby, the touch panel 1071 transmits the touch operation to the processor 110 to determine the type of the touch event, and then the processor 110 provides a corresponding visual output on the display panel 1061 according to the type of the touch event. Although in fig. 4, the touch panel 1071 and the display panel 1061 are two independent components to implement the input and output functions of the terminal, in some embodiments, the touch panel 1071 and the display panel 1061 may be integrated to implement the input and output functions of the terminal, and is not limited herein.

The interface unit 108 is an interface for connecting an external device to the terminal 100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 108 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the terminal 100 or may be used to transmit data between the terminal 100 and the external device.

The memory 109 may be used to store software programs as well as various data. The memory 109 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 109 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 110 is a control center of the terminal, connects various parts of the entire terminal using various interfaces and lines, and performs various functions of the terminal and processes data by operating or executing software programs and/or modules stored in the memory 109 and calling data stored in the memory 109, thereby performing overall monitoring of the terminal. Processor 110 may include one or more processing units; preferably, the processor 110 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 110.

The terminal 100 may further include a power supply 111 (e.g., a battery) for supplying power to various components, and preferably, the power supply 111 may be logically connected to the processor 110 through a power management system, so as to manage charging, discharging, and power consumption management functions through the power management system.

In addition, the terminal 100 includes some functional modules that are not shown, and thus, the detailed description thereof is omitted.

Preferably, an embodiment of the present invention further provides a terminal, which includes a processor 110, a memory 109, and a computer program stored in the memory 109 and capable of running on the processor 110, where the computer program, when executed by the processor 110, implements each process of the above session processing method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not described here again.

The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the above-mentioned session processing method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A session processing method is applied to a terminal, and is characterized by comprising the following steps:

receiving a session release message sent by a session management functional entity; the session release message comprises a back-off time value and identification information, wherein the identification information is used for indicating that resources are insufficient;

initiating a session establishment request through available resources under the condition that the back-off time value is greater than a preset threshold value; wherein the available resources are unoccupied network resources;

wherein the unoccupied network resources include any one of:

a resource of a second network;

a particular slice resource;

specific slice resources and available data network name DNN resources.

2. The method of claim 1, wherein in the case that the unoccupied network resource is a resource of the second network, the initiating a session establishment request through an available resource comprises:

switching from a first network where the current network is located to a second network;

in the second network, initiating the session establishment request through a resource of the second network.

3. The method of claim 2, after initiating the session establishment request, further comprising:

and switching back to the first network when the back-off time value expires and the working mode is an idle mode.

4. The method according to claim 1, wherein in the case that the unoccupied network resource is the specific slice resource, the identification information is first identification information, and the first identification information is used to indicate that the specific slice resource is insufficient; the initiating a session establishment request through available resources includes:

determining available single network slice selection auxiliary information S-NSSAI resources; wherein the available S-NSSAI resources are used to indicate available specific slice resources;

initiating the session establishment request based on the available S-NSSAI resources.

5. The method of claim 4, further comprising, prior to initiating the session establishment request:

judging whether available S-NSSAI resources exist or not;

if the available S-NSSAI resources do not exist, switching from the first network where the S-NSSAI resources are currently located to a second network; in the second network, initiating the session establishment request through a resource of the second network.

6. The method according to claim 1, characterized in that in case the unoccupied network resources are the specific slice resources and available DNN resources, the identification information is second identification information indicating that the specific slice resources and data network name DNN resources are insufficient; the initiating a session establishment request through available resources includes:

determining available S-NSSAI resources and available DNN resources; wherein the available S-NSSAI resources are used to indicate available specific slice resources;

initiating the session establishment request based on the available S-NSSAI resources and the available DNN resources.

7. The method of claim 6, prior to initiating the session establishment request, further comprising:

judging whether available S-NSSAI resources and available DNN resources exist at the same time;

if not, switching from the first network to the second network; in the second network, initiating the session establishment request through a resource of the second network.

8. The method according to claim 5 or 7, further comprising, after initiating the session establishment request:

9. A session processing apparatus, comprising:

a receiving module, configured to receive a session release message sent by a session management function entity SMF; the session release message comprises a back-off time value and identification information, wherein the identification information is used for indicating that resources are insufficient;

the initiating module is used for initiating a session establishment request through the available resources under the condition that the back-off time value is greater than a preset threshold value; wherein the available resources are unoccupied network resources;

wherein the unoccupied network resources include any one of:

a resource of a second network;

a particular slice resource;

specific slice resources and DNN resources available.

10. The apparatus of claim 9, further comprising: a switching module;

the switching module is used for switching from a first network where the switching module is currently located to a second network;

the initiating module is specifically configured to initiate, in the second network, the session establishment request through a resource of the second network.

11. The apparatus of claim 10, wherein the switching module is further configured to:

12. The apparatus according to claim 9, wherein in the case that the unoccupied network resource is the specific slice resource, the identification information is first identification information, and the first identification information is used to indicate that the specific slice resource is insufficient; the initiating module is specifically configured to:

13. The apparatus of claim 12, further comprising: the device comprises a judging module and a switching module;

the switching module is used for switching from the current first network to the second network under the condition that available S-NSSAI resources do not exist;

the initiating module is configured to initiate the session establishment request through a resource of the second network in the second network.

14. The apparatus of claim 9, wherein in case that the unoccupied network resource is the specific slice resource and available DNN resource, the identification information is second identification information indicating that specific slice resource and data network name DNN resource are insufficient; the initiating module is specifically configured to:

15. The apparatus of claim 14, further comprising: the device comprises a judging module and a switching module;

the judging module is used for judging whether available S-NSSAI resources and available DNN resources exist at the same time;

16. The apparatus of claim 13 or 15, wherein the switching module is further configured to:

17. A terminal comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing a session handling method as claimed in any one of claims 1 to 8.

18. A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, implements a session processing method according to any one of claims 1 to 8.