CN114449547B - Method, base station and communication system for releasing suspension information - Google Patents

Method, base station and communication system for releasing suspension information Download PDF

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Publication number
CN114449547B
CN114449547B CN202011209283.2A CN202011209283A CN114449547B CN 114449547 B CN114449547 B CN 114449547B CN 202011209283 A CN202011209283 A CN 202011209283A CN 114449547 B CN114449547 B CN 114449547B
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China
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internet
information
things
terminal
rrc connection
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CN114449547A (en
Inventor
王文治
郭靓
崔立鹏
王志佳
阚悦源
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/38—Connection release triggered by timers

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present disclosure provides a method, a base station and a communication system for releasing suspension information. The method for releasing the suspension information comprises the following steps: after receiving a query request sent by the MME for the terminal of the Internet of things, querying whether an RRC connection in a suspended state associated with the terminal of the Internet of things exists; if the RRC connection in the suspended state exists, the query result is sent to the MME; after receiving a first release request sent by the MME, deleting the associated information of the RRC connection in a suspended state; and sending a second release request to the internet of things terminal so that the internet of things terminal deletes the AS information stored by the internet of things terminal. The method and the device can effectively delete the related information of the RRC connection in the suspended state, and reduce the pressure of the base station side.

Description

Method, base station and communication system for releasing suspension information
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method, a base station, and a communications system for releasing suspension information.
Background
The 3GPP (3 rd Generation Partnership Project, third generation partnership project) has developed a technical study for enhancing the functions of a mobile communication network according to a narrowband service application scenario to adapt to the business requirements of the internet of things which is vigorously developed. Narrowband internet of things (Narrow Band Internet of Things, NB-IoT) is an emerging technology in the field of internet of things, supporting cellular data connection of Low Power consumption devices in a Wide Area Network, also called LPWAN (Low-Power Wide-Area Network). The NB-IoT is built in a cellular network and can be directly deployed in a GSM (Global System for Mobile Communication, global System for Mobile communications) network, a UMTS (Universal Mobile Telecommunications System ) network or an LTE (Long Term Evolution, long term evolution) network to reduce deployment costs and achieve smooth upgrades.
The terminal of the Internet of things is equipment for connecting the sensing network layer and the transmission network layer in the Internet of things to collect data and send the data to the network layer. It is responsible for various functions such as data acquisition, preliminary processing, encryption, transmission, etc. The fixed-position internet of things terminal refers to the fact that the position of the internet of things terminal is basically unchanged after installation, such as a meter reading internet of things terminal. In order to adapt the LTE network to NB-IoT, an UP (User Plane) mode of operation has emerged in the prior art. This mode of operation introduces RRC (radio resource control ) connection suspension and recovery procedures. In the UP operation mode, if the terminal has no service for a period of time, the base station suspends the RRC connection of the terminal. When the base station decides to suspend the RRC connection, the base station sends an RRC connection release message on the SRB (Signaling Radio Bearer ) 1 through the downlink logical channel DL-DCCH, where the release factor carried in the message is that the RRC is suspended and carries a resume identity ResumeID, and the terminal performs related operations of the access layer context suspension. The message may also optionally carry redirection information, extended latency information. In NB-IoT systems, if the terminal is switched in UP mode, it is only switched between a suspend (active) state and an active state until the terminal or core network is actively released for some reason.
Disclosure of Invention
The inventor finds that in the UP working mode, the suspension of the terminal needs to save the context information at the base station side, so that certain resources are occupied. Especially when the number of terminals covered under one base station is huge, the context information stored in the base station occupies a large amount of memory resources, and the performance of the base station is seriously affected.
Accordingly, the present disclosure provides a scheme for releasing suspension information, which can effectively reduce the pressure at the base station side.
According to a first aspect of embodiments of the present disclosure, there is provided a method for releasing suspension information, performed by a base station, comprising: after receiving a query request for an internet of things terminal sent by a Mobility Management Entity (MME), querying whether a Radio Resource Control (RRC) connection in a suspended state associated with the internet of things terminal exists or not; if the RRC connection in the suspended state exists, sending a query result to the MME; deleting the related information of the RRC connection in the suspended state after receiving a first release request sent by the MME; and sending a second release request to the internet of things terminal so that the internet of things terminal deletes the access layer AS information stored by the internet of things terminal.
In some embodiments, after establishing an RRC connection with the internet of things terminal, detecting whether there is no traffic on the RRC connection within a preset time range; if no service flow exists on the RRC connection within a preset time range, a suspension request is sent to the Internet of things terminal, so that the Internet of things terminal releases the RRC connection and stores corresponding AS information; and after receiving a suspension confirmation response sent by the internet of things terminal, releasing the RRC connection and storing the associated information of the RRC connection.
In some embodiments, the association information of the RRC connection includes AS information of the internet of things terminal, and corresponding S1AP association information and bearer context.
According to a second aspect of embodiments of the present disclosure, there is provided a base station for releasing suspension information, comprising: the inquiry module is configured to inquire whether Radio Resource Control (RRC) connection in a suspended state associated with the terminal of the Internet of things exists or not after receiving an inquiry request for the terminal of the Internet of things sent by a Mobility Management Entity (MME), and if the RRC connection in the suspended state exists, the inquiry result is sent to the MME; and the release processing module is configured to delete the associated information of the RRC connection in the suspended state after receiving the first release request sent by the MME, and send a second release request to the Internet of things terminal so that the Internet of things terminal deletes the AS information of the access stratum stored by the Internet of things terminal.
In some embodiments, the base station further comprises: and the connection management module is configured to detect whether the RRC connection has no service traffic within a preset time range after the RRC connection is established with the Internet of things terminal, if the RRC connection has no service traffic within the preset time range, the connection management module sends a suspension request to the Internet of things terminal so that the Internet of things terminal releases the RRC connection and stores corresponding AS information, and after receiving a suspension confirmation response sent by the Internet of things terminal, releases the RRC connection and stores the associated information of the RRC connection.
In some embodiments, the association information of the RRC connection includes AS information of the internet of things terminal, and corresponding S1AP association information and bearer context.
According to a third aspect of embodiments of the present disclosure, there is provided a base station for releasing suspension information, comprising: a memory configured to store instructions; a processor coupled to the memory, the processor configured to perform a method according to any of the embodiments described above based on instructions stored in the memory.
According to a fourth aspect of embodiments of the present disclosure, there is provided a communication system for releasing suspension information, comprising: a base station as in any above embodiments; a Mobility Management Entity (MME) configured to send a query request for an Internet of things terminal to the base station when the duration of a timer is equal to the active duration of the Internet of things terminal, wherein the timer is started when the Internet of things terminal is attached to the MME, and configured to send a first release request to the base station after receiving a query result sent by the base station and used for indicating that RRC connection in a suspended state exists; the internet of things terminal is configured to delete the access layer AS information stored by the internet of things terminal according to the second release request sent by the base station.
In some embodiments, the terminal of the internet of things is further configured to send an attach request to the MME after powering on, and to establish a radio resource control RRC connection with the base station after receiving the attach response information sent by the MME; the MME is further configured to send attachment response information to the Internet of things terminal and start the timer after receiving an attachment request of the Internet of things terminal.
In some embodiments, the MME is further configured to set tracking area update processing indication information in the attach response information in case the location of the internet of things terminal is fixed; the internet of things terminal is further configured to set a periodic tracking area update capability to an off state according to tracking area update processing instruction information included in the attachment response information.
In some embodiments, the terminal of the internet of things is further configured to release the RRC connection and store corresponding AS information according to a suspension request sent by the base station, and send a suspension acknowledgement response to the base station.
In some embodiments, the internet of things terminal is further configured to send a tracking area update request to the MME if network capability parameters need to be modified; the MME is further configured to update network capability parameters of the Internet of things terminal according to update parameters included in the tracking area update request.
According to a fifth aspect of embodiments of the present disclosure, there is provided a computer readable storage medium, wherein the computer readable storage medium stores computer instructions which, when executed by a processor, implement a method as referred to in any of the embodiments above.
Other features of the present disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments of the disclosure, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The disclosure may be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow diagram of a method of releasing suspension information according to one embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a base station according to one embodiment of the present disclosure;
fig. 3 is a schematic structural view of a base station according to another embodiment of the present disclosure;
fig. 4 is a schematic structural view of a base station according to still another embodiment of the present disclosure;
fig. 5 is a schematic diagram of a communication system according to one embodiment of the present disclosure;
fig. 6 is a flow diagram of a method of releasing suspension information according to another embodiment of the present disclosure.
It should be understood that the dimensions of the various elements shown in the figures are not drawn to actual scale. Further, the same or similar reference numerals denote the same or similar members.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative, and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, and the numerical values set forth in these examples should be construed as merely illustrative, and not limiting unless specifically stated otherwise.
The use of the terms "comprising" or "including" and the like in this disclosure means that elements preceding the term encompass the elements recited after the term, and does not exclude the possibility of also encompassing other elements.
All terms (including technical or scientific terms) used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs, unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
Fig. 1 is a flow diagram of a method of releasing suspension information according to one embodiment of the present disclosure. In some embodiments, the following method steps of releasing the suspension information are performed by the base station.
In step 101, after receiving a query request for an internet of things terminal sent by an MME (Mobility Management Entity ), it is queried whether there is an RRC connection associated with the internet of things terminal in a suspended state.
It should be noted that, after the terminal of the internet of things is attached, the MME starts a timer, and if the duration of the timer is equal to the active duration of the terminal of the internet of things, the MME sends a query request to the base station.
In step 102, if there is an RRC connection in a suspended state, the query result is sent to the MME.
In some embodiments, after establishing an RRC connection with an internet of things terminal, the base station detects whether there is no traffic on the RRC connection within a preset time range. If no service flow exists on the RRC connection within the preset time range, the base station sends a suspension request to the terminal of the Internet of things so that the terminal of the Internet of things releases the RRC connection and stores corresponding AS information. And after receiving the suspension confirmation response sent by the terminal of the Internet of things, the base station releases the RRC connection and stores the associated information of the RRC connection.
In step 103, after receiving the first release request sent by the MME, the association information of the RRC connection in the suspended state is deleted.
In some embodiments, the association information of the RRC connection includes AS (Access Stratum) information of the terminal of the internet of things, and corresponding S1AP (S1 Application Protocol, S1 interface application protocol identifier) association information and bearer context.
In step 104, a second release request is sent to the terminal of the internet of things, so that the terminal of the internet of things deletes the AS information stored by the terminal of the internet of things.
In the method for releasing the suspension information provided in the above embodiment of the present disclosure, the base station deletes the stored related information of the RRC connection in the suspension state according to the indication of the MME, so as to effectively reduce the storage pressure of the base station.
Fig. 2 is a schematic diagram of a structure of a base station according to one embodiment of the present disclosure. As shown in fig. 2, the base station includes a query module 21 and a release processing module 22.
The querying module 21 is configured to query whether there is a radio resource control RRC connection associated with the internet of things terminal in a suspended state after receiving a query request for the internet of things terminal sent by the MME. If there is an RRC connection in the suspended state, the query module 21 sends the query result to the MME.
It should be noted that, after the terminal of the internet of things is attached, the MME starts a timer, and if the duration of the timer is equal to the active duration of the terminal of the internet of things, the MME sends a query request to the base station.
The release processing module 22 is configured to delete the association information of the RRC connection in the suspended state after receiving the first release request sent by the MME, and send a second release request to the internet of things terminal, so that the internet of things terminal deletes the AS information stored by itself.
In some embodiments, the association information of the RRC connection includes AS information of the internet of things terminal, and corresponding S1AP association information and bearer context.
Fig. 3 is a schematic structural diagram of a base station according to another embodiment of the present disclosure. Fig. 3 differs from fig. 2 in that in the embodiment shown in fig. 3 the base station further comprises a connection management module 23.
The connection management module 23 is configured to detect whether there is no traffic on the RRC connection within a preset time range after establishing the RRC connection with the internet of things terminal, and if there is no traffic on the RRC connection within the preset time range, send a suspension request to the internet of things terminal, so that the internet of things terminal releases the RRC connection and stores corresponding AS information, and after receiving a suspension confirmation response sent by the internet of things terminal, release the RRC connection and store association information of the RRC connection.
Fig. 4 is a schematic structural diagram of a base station according to still another embodiment of the present disclosure. As shown in fig. 4, the base station includes a memory 41 and a processor 42.
The memory 41 is used to store instructions. The processor 42 is coupled to the memory 41. The processor 42 is configured to perform a method as referred to in any of the embodiments of fig. 1 based on the instructions stored by the memory.
As shown in fig. 4, the base station further comprises a communication interface 43 for information interaction with other devices. Meanwhile, the base station further comprises a bus 44, and the processor 42, the communication interface 43 and the memory 41 perform communication with each other through the bus 44.
The Memory 41 may include a high-speed RAM (Random Access Memory ) and may further include a Non-Volatile Memory (NVM). Such as at least one disk storage. The memory 41 may also be a memory array. The memory 41 may also be partitioned and the blocks may be combined into virtual volumes according to certain rules.
Further, the processor 42 may be a central processing unit, or may be an ASIC (Application Specific Integrated Circuit ), or one or more integrated circuits configured to implement embodiments of the present disclosure.
The present disclosure also provides a computer-readable storage medium. The computer readable storage medium stores computer instructions that, when executed by a processor, implement a method as referred to in any of the embodiments of fig. 1.
Fig. 5 is a schematic diagram of a communication system according to one embodiment of the present disclosure. As shown in fig. 5, the communication system includes a base station 51, an MME 52, and an internet of things terminal 53. The base station 51 is a base station to which any of the embodiments of fig. 2 to 4 relates.
The MME 52 sends a query request for the internet of things terminal to the base station 51 if the duration of the timer is equal to the active duration of the internet of things terminal, wherein the timer is started when the internet of things terminal is attached to the MME.
Here, the MME 52 starts a timer after the internet of things terminal 53 is attached, and if the timer duration is equal to the active duration of the internet of things terminal, the MME 52 sends a query request to the base station 51.
The MME 52 further sends a first release request to the base station 51 after receiving the query result sent by the base station 51 for indicating that there is an RRC connection in the suspended state, so that the base station 52 deletes the AS information of the internet of things terminal 53, and the corresponding S1AP related information and bearer context. In addition, the internet of things terminal 53 deletes the AS information stored in itself according to the second release request sent by the base station 52.
In some embodiments, the internet of things terminal 53 sends an attach request to the MME 52 after power-on. After receiving the attachment request of the internet of things terminal 53, the MME 52 sends attachment response information to the internet of things terminal 53 and starts a timer. After receiving the attach response information sent by the MME 52, the internet of things terminal 53 establishes an RRC connection with the base station 51.
In some embodiments, the MME 52 sets the tracking area update processing indication information in the attach response information in case that the location of the internet of things terminal 53 is fixed. The internet of things terminal 53 sets the periodic tracking area update capability to the off state according to the tracking area update processing instruction information included in the attachment response information. Since the location of the internet of things terminal 53 is fixed, periodic tracking area updates are not required.
In some embodiments, the internet of things terminal 53 releases the RRC connection and stores the corresponding AS information according to the suspension request sent by the base station 51, and sends a suspension acknowledgement response to the base station 51.
In some embodiments, the internet of things terminal 53 sends a tracking area update request to the MME 52 in case network capability parameters need to be modified. The MME 53 updates network capability parameters of the internet of things terminal according to the update parameters included in the tracking area update request.
Fig. 6 is a flow diagram of a method of releasing suspension information according to another embodiment of the present disclosure.
In step 601, the terminal of the internet of things sends an attach request to the MME after powering on.
In some embodiments, the attachment request includes terminal type information, for example, the MME determines that the internet of things terminal is a fixed-location internet of things terminal according to the terminal type information. In addition, the attach request includes PSM (Power Saving Mode, power save mode) related parameters including an active duration and a power save mode duration.
In step 602, after receiving the attachment request of the terminal of the internet of things, the mme sends attachment response information to the terminal of the internet of things. And under the condition that the Internet of things terminal is at a fixed position, the attachment response information comprises tracking area updating processing information.
In step 603, the mme starts a timer.
In step 604, after receiving the attach response information sent by the MME, the internet of things terminal sets the periodic tracking area update capability to an off state according to the tracking area update processing information.
In step 605, the terminal of the internet of things establishes an RRC connection with a corresponding base station.
In step 606, the base station detects whether there is no traffic on the RRC connection for a preset time range. If no service flow exists on the RRC connection within the preset time range, the base station sends a suspension request to the terminal of the Internet of things.
In step 607, the terminal of the internet of things releases the RRC connection and stores the corresponding AS information.
In step 608, the terminal of the internet of things sends a suspension confirmation response to the base station.
In step 609, the base station releases the RRC connection and stores the AS information of the internet of things terminal, and the corresponding S1AP association information and bearer context.
In step 610, the mme sends a query request to the base station if the duration of the timer is equal to the active duration of the terminal of the internet of things.
In step 611, the base station queries whether there is an RRC connection in a suspended state associated with the internet of things terminal according to the query request. If the RRC connection in the suspended state exists, the base station sends a corresponding query result to the MME.
In step 612, the mme sends a first release request to the base station according to the received query result.
In step 613, the base station deletes the AS information of the terminal of the internet of things, and the corresponding S1AP association information and bearer context according to the first release request.
In step 614, the base station sends a second release request to the internet of things terminal.
In step 615, the internet of things terminal deletes the AS information stored in the internet of things terminal according to the second release request.
In some embodiments, the internet of things terminal sends a tracking area update request to the MME if the network capability parameter needs to be modified. And the MME updates the network capacity parameters of the terminal of the Internet of things according to the update parameters included in the tracking area update request.
For example, the TAU (Tracking Area Update ) period is adjusted in this way.
In some embodiments, the functional modules described above may be implemented as general-purpose processors, programmable logic controllers (Programmable Logic Controller, abbreviated as PLCs), digital signal processors (Digital Signal Processor, abbreviated as DSPs), application specific integrated circuits (Application Specific Integrated Circuit, abbreviated as ASICs), field programmable gate arrays (Field-Programmable Gate Array, abbreviated as FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described herein.
Thus, embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concepts of the present disclosure, some details known in the art are not described. How to implement the solutions disclosed herein will be fully apparent to those skilled in the art from the above description.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that the foregoing embodiments may be modified and equivalents substituted for elements thereof without departing from the scope and spirit of the disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (13)

1. A method for releasing suspension information, performed by a base station, comprising:
after receiving a query request for an internet of things terminal sent by a Mobility Management Entity (MME), querying whether a Radio Resource Control (RRC) connection in a suspended state associated with the internet of things terminal exists or not;
if the RRC connection in the suspended state exists, sending a query result to the MME;
deleting the related information of the RRC connection in the suspended state after receiving a first release request sent by the MME;
and sending a second release request to the internet of things terminal so that the internet of things terminal deletes the access layer AS information stored by the internet of things terminal.
2. The method of claim 1, further comprising:
after establishing RRC connection with the terminal of the Internet of things, detecting whether service traffic does not exist on the RRC connection within a preset time range;
if no service flow exists on the RRC connection within a preset time range, a suspension request is sent to the Internet of things terminal, so that the Internet of things terminal releases the RRC connection and stores corresponding AS information;
and after receiving a suspension confirmation response sent by the internet of things terminal, releasing the RRC connection and storing the associated information of the RRC connection.
3. The method of claim 2, wherein,
the related information of the RRC connection comprises AS information of the terminal of the Internet of things, corresponding S1AP related information and bearing context.
4. A base station for releasing suspension information, comprising:
the inquiry module is configured to inquire whether Radio Resource Control (RRC) connection in a suspended state associated with the terminal of the Internet of things exists or not after receiving an inquiry request for the terminal of the Internet of things sent by a Mobility Management Entity (MME), and if the RRC connection in the suspended state exists, the inquiry result is sent to the MME;
and the release processing module is configured to delete the associated information of the RRC connection in the suspended state after receiving the first release request sent by the MME, and send a second release request to the Internet of things terminal so that the Internet of things terminal deletes the AS information of the access stratum stored by the Internet of things terminal.
5. The base station of claim 4, further comprising:
and the connection management module is configured to detect whether the RRC connection has no service traffic within a preset time range after the RRC connection is established with the Internet of things terminal, if the RRC connection has no service traffic within the preset time range, the connection management module sends a suspension request to the Internet of things terminal so that the Internet of things terminal releases the RRC connection and stores corresponding AS information, and after receiving a suspension confirmation response sent by the Internet of things terminal, releases the RRC connection and stores the associated information of the RRC connection.
6. The base station of claim 5, wherein,
the related information of the RRC connection comprises AS information of the terminal of the Internet of things, corresponding S1AP related information and bearing context.
7. A base station for releasing suspension information, comprising:
a memory configured to store instructions;
a processor coupled to the memory, the processor configured to perform the method of any of claims 1-3 based on instructions stored by the memory.
8. A communication system for releasing suspension information, comprising:
the base station of any of claims 4-7;
a Mobility Management Entity (MME) configured to send a query request for an Internet of things terminal to the base station when the duration of a timer is equal to the active duration of the Internet of things terminal, wherein the timer is started when the Internet of things terminal is attached to the MME, and configured to send a first release request to the base station after receiving a query result sent by the base station and used for indicating that RRC connection in a suspended state exists;
the internet of things terminal is configured to delete the access layer AS information stored by the internet of things terminal according to the second release request sent by the base station.
9. The system of claim 8, wherein:
the terminal of the Internet of things is further configured to send an attachment request to the MME after the terminal is started, and establish Radio Resource Control (RRC) connection with the base station after receiving attachment response information sent by the MME;
the MME is further configured to send attachment response information to the Internet of things terminal and start the timer after receiving an attachment request of the Internet of things terminal.
10. The system of claim 9, wherein:
the MME is further configured to set tracking area update processing indication information in the attachment response information under the condition that the position of the terminal of the Internet of things is fixed;
the internet of things terminal is further configured to set a periodic tracking area update capability to an off state according to tracking area update processing instruction information included in the attachment response information.
11. The system of claim 9, wherein:
the internet of things terminal is further configured to release the RRC connection and store corresponding AS information according to a suspension request sent by the base station, and send a suspension acknowledgement response to the base station.
12. The system of claim 8, wherein:
the terminal of the internet of things is further configured to send a tracking area update request to the MME in case of needing to modify network capability parameters;
the MME is further configured to update network capability parameters of the Internet of things terminal according to update parameters included in the tracking area update request.
13. A computer readable storage medium storing computer instructions which, when executed by a processor, implement the method of any one of claims 1-3.
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