CN109996327B

CN109996327B - Communication method and device

Info

Publication number: CN109996327B
Application number: CN201711487380.6A
Authority: CN
Inventors: 李濛; 应江威; 李秉肇; 杨艳梅
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-12-29
Filing date: 2017-12-29
Publication date: 2021-10-01
Anticipated expiration: 2037-12-29
Also published as: CN109996327A; WO2019128622A1

Abstract

The application discloses a communication method and a device, which relate to the field of communication, and the method comprises the following steps: the terminal equipment receives a period RAN notification area update monitoring timer duration from a radio access network RAN node; and the terminal equipment acquires the time length of a target periodic registration update timer according to the time length of the periodic RAN notification area update monitoring timer and the configured periodic registration update timer, wherein the time length of the target periodic registration update timer is used for setting the periodic registration update timer.

Description

Communication method and device

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to a communication method and apparatus.

Background

A new state is introduced in the 5G communication system: radio Resource Control (RRC) inactive (RRC inactive) state. In this state, the terminal device and the Core Network (CN) are in a Connection Management (CM) CONNECTED (CM-CONNECTED) state, and the CN does not perceive that the terminal device and the Radio Access Network (RAN) node are in a non-CONNECTED state. Therefore, the terminal device and an access and mobility management function (AMF) node respectively use different timers to implement state transition of the terminal device so as to synchronize the states of the terminal device on the terminal device and the AMF node.

However, the state synchronization of the terminal device on the terminal device and the AMF node is not timely, which may cause a problem of low communication efficiency of the terminal device, and therefore, the timer needs to be further optimized.

Disclosure of Invention

Embodiments of the present application provide a communication method, which may optimize the timer and synchronize states of a terminal device and a terminal device on an AMF node, so as to improve communication efficiency of the terminal device.

In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions:

in a first aspect, a communication method is provided, including: the terminal equipment receives a period RAN notification area update monitoring timer duration from a radio access network RAN node; and the terminal equipment acquires the time length of a target periodic registration update timer according to the time length of the periodic RAN notification area update monitoring timer and the configured periodic registration update timer, wherein the time length of the target periodic registration update timer is used for setting the periodic registration update timer. The target period registration update timer duration may be a difference between the configured period registration update timer duration and the period RAN notification area update monitoring timer duration.

In a second aspect, a communication method is provided, including: the terminal equipment receives a period RAN notification area update monitoring timer duration from a radio access network RAN node; and the terminal equipment sets an initial value of a periodic registration updating timer according to the time length of the periodic RAN notification area updating monitoring timer. The initial value may be a time length of the periodic RAN notification area update monitoring timer, or a difference between a configured time length of the periodic registration update timer and a time length of the periodic RAN notification area update monitoring timer.

In a third aspect, a communication method is provided, including: an access and mobility management function (AMF) node receives timer reference information from a Radio Access Network (RAN) node, wherein the timer reference information is the time length of a periodic RAN notification area update timer or the difference value between the time length of the periodic RAN notification area update monitoring timer and the time length of the periodic RAN notification area update timer; and the AMF node acquires the time length of a target mobile reachable timer according to the timer reference information, wherein the time length of the target mobile reachable timer is used for setting the mobile reachable timer. Specifically, the AMF node may obtain the target mobile reachable timer duration according to the timer reference information and the normal mobile reachable timer duration. For example, the target mobile reachable timer duration may be a difference between the normal mobile reachable timer duration and the timer reference information.

In a fourth aspect, a communication method is provided, including: an access and mobility management function (AMF) node receives timer reference information from a Radio Access Network (RAN) node, wherein the timer reference information is the time length of a periodic RAN notification area updating monitoring timer, the time length of the periodic RAN notification area updating timer or the difference value between the time length of the periodic RAN notification area updating monitoring timer and the time length of the periodic RAN notification area updating timer; and the AMF node sets an initial value of a mobile reachable timer according to the timer reference information. The initial value is the timer reference information, or the difference between the normal movement reachable timer duration and the timer reference information.

In a fifth aspect, a communication method is provided, including: a Radio Access Network (RAN) node acquires timer reference information, wherein the timer reference information is the time length of a periodic RAN notification area update timer or the difference value between the time length of the periodic RAN notification area update monitoring timer and the time length of the periodic RAN notification area update timer; the RAN node sends the timer reference information to an access and mobility management function, AMF, node. The timer reference information can be used for setting a mobile reachable timer by the AMF node, so that the unreachable time of the terminal equipment on the AMF node is more reasonable.

With reference to the fifth aspect, in one possible design of the fifth aspect, the method further includes: and the RAN node sends a periodic RAN notification area update monitoring timer duration to the terminal equipment. The periodic RAN informs the area updating monitoring timer of the time length for the terminal equipment to set the periodic registration updating timer so as to solve the problem that the periodic registration updating timer and the mobile reachable timer cannot be synchronized in time due to introduction of the elapsed time.

In a sixth aspect, a communication method is provided, including: a Radio Access Network (RAN) node acquires the duration of a periodic RAN notification area update monitoring timer; and the RAN node sends the periodic RAN notification area update monitoring timer duration to terminal equipment. The period RAN informs the area to update the duration of the monitoring timer, and the duration is used for setting a period registration update timer by the terminal equipment, so that the problem that the period registration update timer and the mobile reachable timer cannot be synchronized in time due to introduction of the elapsed time is solved

In a seventh aspect, a communication method is provided, including: the terminal equipment obtains the time length of a periodic radio access network RAN notification area updating timer; and the terminal equipment acquires the time length of a target periodic registration update timer according to the time length of the periodic RAN notification area update timer and the configured periodic registration update timer, wherein the time length of the target periodic registration update timer is used for setting the periodic registration update timer. The target period registration update timer duration may be a difference between the configured period registration update timer duration and the period RAN notification area update timer duration. The method can solve the problem that the periodic registration update timer and the mobile reachable timer cannot be synchronized in time due to introduction of the elapsed time.

In an eighth aspect, a communication method is provided, including: the terminal equipment obtains the time length of a periodic radio access network RAN notification area updating timer; and the terminal equipment sets an initial value of a periodic registration updating timer according to the time length of the periodic RAN notification area updating timer. The initial value may be a time length of the periodic RAN notification area update timer, or a difference between a configured time length of the periodic registration update timer and a time length of the periodic RAN notification area update timer. The method can solve the problem that the periodic registration update timer and the mobile reachable timer cannot be synchronized in time due to introduction of the elapsed time.

In a ninth aspect, a communication method is provided, including: the terminal equipment receives a Radio Resource Control (RRC) connection release message from a Radio Access Network (RAN) node; the terminal equipment sets the state of the terminal equipment according to the RRC connection release message; when the terminal equipment is switched from an RRC connected state to an RRC non-activated state, the terminal equipment simultaneously starts a periodic RAN notification area updating timer and a periodic registration updating timer. The method can solve the problem that the periodic registration update timer and the mobile reachable timer cannot be synchronized in time due to introduction of the elapsed time.

In a tenth aspect, there is provided a communication method comprising: the terminal equipment receives a Radio Resource Control (RRC) connection release message from a Radio Access Network (RAN) node; and the terminal equipment simultaneously starts a periodic RAN notification area updating timer and a periodic registration updating timer according to the RRC connection release message. The method can solve the problem that the periodic registration update timer and the mobile reachable timer cannot be synchronized in time due to introduction of the elapsed time.

In an eleventh aspect, there is provided a communication device comprising means for performing the steps of the method of the first aspect above. The communication means may be a terminal device or at least one processing element or chip.

In a twelfth aspect, a communication device is provided, comprising means or units (means) for performing the steps of the method of the second aspect above. The communication means may be a terminal device or at least one processing element or chip.

In a thirteenth aspect, there is provided a communication device comprising means for performing the steps of the method of the third aspect above. The communication device may be an AMF node or may be at least one processing element or chip.

In a fourteenth aspect, there is provided a communication device comprising means for performing the steps of the method of the fourth aspect above. The communication device may be an AMF node, e.g. an AMF, or may be at least one processing element or chip.

In a fifteenth aspect, there is provided a communication device comprising means or units for performing the steps of the method as may be devised in the above fifth aspect. The communication device may be a RAN node or may be at least one processing element or chip.

In a sixteenth aspect, there is provided a communication device comprising means for performing the steps of the method of the above sixth aspect. The communication device may be a RAN node or may be at least one processing element or chip.

A seventeenth aspect provides a communication device comprising means or units for performing the steps of the method of the seventh aspect above. The communication means may be a terminal device or at least one processing element or chip.

In an eighteenth aspect, there is provided a communication device comprising means for performing the steps of the method of the above eighth aspect. The communication means may be a terminal device, e.g. an AMF, or may be at least one processing element or chip.

A nineteenth aspect provides a communication device comprising means or units for performing the steps of the method of the above ninth aspect. The communication means may be a terminal device or at least one processing element or chip.

A twentieth aspect provides a communication device comprising means for performing the steps of the method of the above tenth aspect. The communication means may be a terminal device or at least one processing element or chip.

In a twenty-first aspect, there is provided a communication device comprising a processor coupled to a memory, the memory for storing a program, the processor calling the program stored in the memory to perform the method of the above first aspect. The communication means may be a terminal device or at least one processing element or chip.

In a twenty-second aspect, there is provided a communications device comprising a processor coupled to a memory, the memory for storing a program, the processor calling the program stored in the memory to perform the method of the second aspect above. The communication means may be a terminal device or at least one processing element or chip.

In a twenty-third aspect, there is provided a communication device comprising a processor coupled to a memory, the memory storing a program, the processor calling the program stored in the memory to perform the method of the above third aspect. The communication device may be an AMF node or may be at least one processing element or chip.

In a twenty-fourth aspect, there is provided a communications device comprising a processor coupled to a memory, the memory for storing a program, the processor calling the program stored by the memory to perform the method of the fourth aspect above. The communication device may be an AMF node or may be at least one processing element or chip.

In a twenty-fifth aspect, there is provided a communications device comprising a processor coupled to a memory, the memory storing a program, the processor calling the program stored in the memory to perform the method of the above fifth aspect. The communication device may be a RAN node or may be at least one processing element or chip.

In a twenty-sixth aspect, there is provided a communications device comprising a processor coupled to a memory, the memory storing a program, the processor calling the program stored in the memory to perform the method of the above sixth aspect. The communication device may be a RAN node or may be at least one processing element or chip.

A twenty-seventh aspect provides a communications device comprising a processor coupled to a memory, the memory for storing a program, the processor calling the program stored in the memory to perform the method of the above seventh aspect. The communication means may be a terminal device or at least one processing element or chip.

In a twenty-eighth aspect, there is provided a communications device comprising a processor coupled to a memory, the memory for storing a program, the processor calling the program stored in the memory to perform the method of the above eighth aspect. The communication means may be a terminal device or at least one processing element or chip.

In a twenty-ninth aspect, there is provided a communications device comprising a processor coupled to a memory, the memory for storing a program, the processor calling the program stored in the memory to perform the method of the above ninth aspect. The communication means may be a terminal device or at least one processing element or chip.

In a thirty-first aspect, there is provided a communications device comprising a processor coupled to a memory, the memory being configured to store a program, the processor calling the program stored in the memory to perform the method of the tenth aspect above. The communication means may be a terminal device or at least one processing element or chip.

In a thirty-first aspect, there is provided a program which, when executed by a processor, is adapted to perform any of the methods of the first aspect above.

A thirty-second aspect provides a computer-readable storage medium containing the program of the thirty-first aspect.

In a thirty-third aspect, there is provided a program which, when executed by a processor, is operable to perform any of the methods of the second aspect above.

In a thirty-fourth aspect, there is provided a computer-readable storage medium containing the program of the thirty-third aspect.

In a thirty-fifth aspect, there is provided a program which, when executed by a processor, is operable to perform any of the methods of the above third aspect.

A thirty-sixth aspect provides a computer-readable storage medium containing the program of the thirty-fifth aspect.

A thirty-seventh aspect provides a program which, when executed by a processor, is operable to perform any of the methods of the fourth aspect above.

A thirty-eighth aspect provides a computer-readable storage medium containing the program of the thirty-seventh aspect.

In a thirty-ninth aspect, there is provided a program which, when executed by a processor, is operable to perform any of the methods of the above fifth aspect.

Fortieth aspect, there is provided a computer-readable storage medium including the program of the thirty-ninth aspect.

Fortieth aspect, a program is provided, which when executed by a processor is adapted to perform any of the methods of the sixth aspect above.

A forty-second aspect provides a computer-readable storage medium containing the program of the forty-first aspect.

A forty-third aspect provides a program which, when executed by a processor, is adapted to perform any of the methods of the seventh aspect above.

A forty-fourth aspect provides a computer-readable storage medium containing the program of the forty-third aspect.

Forty-fifth aspect, there is provided a program for performing any of the methods of the above eighth aspects when executed by a processor.

A forty-sixth aspect provides a computer-readable storage medium including the program of the forty-fifth aspect.

A forty-seventh aspect provides a program which, when executed by a processor, is operable to perform any of the methods of the ninth aspect above.

A forty-eighth aspect provides a computer-readable storage medium containing the program of the forty-fifth aspect.

A forty-ninth aspect provides a program which, when executed by a processor, is adapted to perform any of the methods of the tenth aspect above.

In a fifty-fifth aspect, there is provided a computer readable storage medium containing the program of the forty-ninth aspect.

Drawings

Fig. 1 is a schematic diagram of a network architecture provided in an embodiment of the present application;

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 another communication system provided in an embodiment of the present application;

fig. 4 is a flowchart of a communication method provided by an embodiment of the present application;

fig. 5 is a flowchart of another communication method provided by an embodiment of the present application;

fig. 6 is a flowchart of another communication method provided by an embodiment of the present application;

fig. 7 is a flowchart of another communication method provided by an embodiment of the present application;

fig. 8 is a flowchart of another communication method provided by an embodiment of the present application;

fig. 8a is a flowchart of another communication method provided by an embodiment of the present application;

fig. 9 is a flowchart of another communication method provided by an embodiment of the present application;

fig. 10 is a flowchart of another communication method provided by an embodiment of the present application;

fig. 11 is a flowchart of another communication method provided by an embodiment of the present application;

fig. 12 is a flowchart of another communication method provided by an embodiment of the present application;

fig. 13 is a flow chart of another communication method provided by an embodiment of the present application;

fig. 14 is a flow chart of another communication method provided by an embodiment of the present application;

fig. 15 is a flow chart of another communication method provided by an embodiment of the present application;

fig. 16 is a flow chart of another communication method provided by an embodiment of the present application;

fig. 17 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 18 is a schematic structural diagram of another communication device provided in an embodiment of the present application;

fig. 19 is a schematic structural diagram of another communication device provided in an embodiment of the present application;

fig. 20 is a schematic structural diagram of another communication device provided in an embodiment of the present application;

fig. 21 is a schematic structural diagram of another communication device provided in an embodiment of the present application;

fig. 22 is a schematic structural diagram of another communication device provided in an embodiment of the present application;

fig. 23 is a schematic structural diagram of another communication device provided in an embodiment of the present application;

fig. 24 is a schematic structural diagram of another communication device provided in an embodiment of the present application;

fig. 25 is a schematic structural diagram of another communication device provided in an embodiment of the present application;

fig. 26 is a schematic structural diagram of another communication device provided in an embodiment of the present application;

fig. 27 is a schematic structural diagram of another communication device according to an embodiment of the present application.

Detailed Description

The system architecture and the service scenario described in this application are for more clearly illustrating the technical solution of this application, and do not constitute a limitation to the technical solution provided in this application, and it can be known by those skilled in the art that the technical solution provided in this application is also applicable to similar technical problems along with the evolution of the system architecture and the appearance of new service scenarios.

It is noted that, in the present application, words such as "exemplary" or "for example" are used to mean exemplary, illustrative, or descriptive. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

In the present application, "corresponding" and "corresponding" may sometimes be used in a mixed manner, and it should be noted that the intended meaning is consistent when the distinction is not emphasized.

As shown in fig. 1, fig. 1 is a network structure that can be applied to a 5G communication system. The following briefly introduces the various components of the network architecture as follows:

the terminal equipment: may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem with wireless communication capabilities, as well as various forms of terminals, Mobile Stations (MSs), terminals (terminals), User Equipment (UEs), soft terminals, etc., such as water meters, electricity meters, sensors, etc.

The RAN node: the method is used for managing wireless resources, providing access service for the terminal equipment, further completing the forwarding of control signals and user data between the terminal equipment and a core network, providing a network access function for authorized users in a specific area, and using transmission tunnels with different qualities according to the grade of the users, the requirements of services and the like. For example NG-RAN in 5G systems.

AMF node: the mobility management module is responsible for mobility management, access management, and the like, and may be used to implement functions other than session management in a Mobility Management Entity (MME) function, such as functions of lawful interception, access authorization, and the like.

Session Management Function (SMF) node: for establishing a session for a terminal device, assigning a session Identification (ID), managing and assigning a network Internet Protocol (IP) address of the terminal device, and managing or terminating the session.

Data Network (DN): a network for providing external data, such as an Internet network, etc.

Control Plane Function (CPF) node: the method and the device are mainly used for access control and mobility management functions (such as the function of the AMF) such as authentication, encryption and location registration of the terminal equipment, and session management functions (such as the function of the SMF) such as establishment, release and change of a user plane transmission path. From the perspective of easy understanding, the CPF node can be regarded as a collection of network elements including AMF node, SMF node, etc., without limitation.

User Plane Function (UPF) node: the main functions include packet routing and forwarding, Quality of Service (QoS) processing of user plane data, and the like.

The N2 interface is a reference point of the RAN node and the AMF node, and is used for sending a Non-access stratum (NAS) message, and the like.

The N3 interface is a reference point between the RAN node and the UPF node for transmitting user plane data, etc.

The N4 interface is a reference point between the SMF node and the UPF node, and is used to transmit information such as tunnel identification information, data cache indication information, and downlink data notification message of the N3 connection.

The N6 interface is a reference point between the UPF node and the DN node for transmitting user plane data and the like.

The N1 interface is a reference point between the terminal equipment and the AMF node for the transmission of non access stratum messages.

For ease of understanding, the related art to which this application relates is described:

CM-CONNECTED state: including an RRC CONNECTED (RRC CONNECTED) state, and an RRC Inactive state. When the terminal equipment is in the CM-CONNECTED state, the terminal equipment and the AMF node are CONNECTED by NAS signaling on an N1 interface.

CM IDLE (CM-IDLE) state: when the terminal device is in the CM-IDLE state, the terminal device and the AMF node have no connection of NAS signaling on the N1 interface. Meanwhile, AN access network signaling connection (AN signaling connection) does not exist between the terminal device and the RAN node, AN N2 connection does not exist between the RAN node and the AMF node, and AN N3 connection does not exist between the RAN node and the UPF node.

As shown in fig. 2, fig. 2 is a simplified architecture diagram of a communication system, when a terminal device needs to exchange data with a core network, the terminal device is in an RRC connected state, a RAN node is connected to a CPF node through an N2 interface, and the RAN node is connected to a UPF through an N3 interface. When the terminal device is in the RRC connected state, the RAN node may sense a cell in which the terminal device resides and location information of the terminal device, and a network element (e.g., an AMF node) in the CPF node may sense the RAN node to which the terminal device is connected. In fig. 2, when the downlink data in the DN is transmitted to the UPF node, the UPF node may send the downlink data to the RAN node connected to the terminal device, and then the RAN node sends the downlink data to the terminal device.

When the terminal device in the RRC connected state has no data transmission for a preset time period, the RAN node may decide whether the terminal device should be switched from the RRC connected state to the RRC Inactive state according to a preset policy, and when the terminal device is in the RRC Inactive state, as shown in fig. 3, the RRC connection between the terminal device and the RAN node is released, and the N2 connection between the RAN node and the CPF node and the N3 connection between the RAN node and the UPF node are always maintained.

Mobile accessible timer (mobile accessible timer): and the AMF node is used for timing the terminal equipment in the CM-IDLE state. For example, when the mobile reachable timer expires, the AMF node determines that the terminal device is not reachable, and starts an insertion probability timer, and at this time, the network side cannot page the terminal device. The AMF node stops the timer when the terminal device transitions to the CM-CONNECTED state.

Implicit deregistration timer (implicit deregistration timer): when the mobile accessible timer on the AMF node side is over time, the AMF node starts an interrupt derivation timer, wherein the length of the interrupt derivation timer depends on the realization of the terminal equipment. When the implicit authentication timer times out, the AMF node initiates a de-registration process for the terminal equipment.

Periodic registration update timer (periodic registration update timer): and the terminal equipment is maintained and is used for timing the terminal equipment in the CM-IDLE state. For example, when the periodic Registration Update timer times out, the terminal device initiates a Registration procedure of the type "periodic Registration Update", in which the terminal device transitions to the CM-CONNECTED state.

The mobile accessible timer duration and the periodic registration update timer duration are similar, and different durations can be set by the AMF node according to different terminal devices. Typically, the mobile accessible time duration is 4 minutes longer than the periodic registration update time duration. The default duration of the Periodic registration update timer is 54 minutes.

Periodic RAN notification area update monitoring timer (periodic RAN notification area update guard timer): and the RAN node is used for timing the terminal equipment in the RRC Inactive state. For example, when the timer times out, the state of the terminal device transitions to the CM-IDLE state.

Periodic RAN notification area update timer (periodic RAN notification area update timer): and the terminal equipment is maintained and used for timing the terminal equipment in the RRC Inactive state, for example, when the timer is over, the state of the terminal equipment is converted into a CM-IDLE state.

The time length of the periodic RAN notification area update timer is similar to that of the periodic RAN notification area update monitoring timer, and the RAN can set different time lengths according to different terminal devices. In general, the periodic RAN Notification area update guard timer is slightly longer than the periodic RAN Notification area update timer. The default duration of the Periodic RAN notification area update guard timer is about 30 minutes.

Elapsed time (elapsed time): the elapsed time since the RAN node last contacted the terminal device (e.g., the RAN node sent an RRC connection release message, or an RRC connection resume message, etc.) is determined. The elapsed time may be used to optimize the unreachable time of the terminal device on the AMF node, e.g., to set a mobile reachable timer.

Illustratively, after receiving the RRC connection release message from the RAN node, the terminal device switches its state to an RRC Inactive state, and starts a period RAN notification area update timer. The Period RAN notification area update timer times out to trigger the terminal device to perform an RRC connection recovery (RRC connection resume) procedure. When the RRC connection resume procedure fails (e.g., RRC connection recovery request message transmission fails), the terminal device transitions to a CM-IDLE state and starts a periodic registration update timer. When the AMF node learns that the terminal equipment is converted into the CM-IDLE state, a mobile accessible timer is started, and when the mobile accessible timer is overtime, the AMF node determines that the terminal equipment cannot be reached and cannot page the terminal equipment.

The inventor of the present application found in the course of research that: the introduction of the elapsed time causes that the periodic registration update timer of the terminal device cannot be synchronized with the mobile accessible timer of the AMF node, that is, the overtime of the two timers is different from each other, which causes the state of the terminal device to be seriously desynchronized on the two devices, and affects the communication efficiency of the terminal device. Specifically, the mobile reachabitable timer duration on the AMF node may become shorter due to the elapsed time, and based on the explicit differentiation timer duration and the shortened mobile reachabitable timer duration, the following two problems may occur:

under the condition that the duration of the implicit integrity timer is short (for example, the sum of the mobile accessible timer duration and the implicit integrity timer duration is less than the duration of the periodic registration update timer), when the terminal device initiates the periodic registration update, the implicit integrity timer of the AMF node is already overtime and is already registered with the terminal device, so that the AMF node receives the periodic registration update initiated by the unregistered terminal device, signaling is wasted, and the communication efficiency of the terminal device is reduced.

Under the condition that the duration of the invalid probability timer is long (for example, the sum of the duration of the mobile accessible timer and the duration of the invalid probability timer is greater than the duration of the periodic registration update timer), the AMF node confirms that the terminal device is unreachable within the time period from the time when the mobile accessible timer times out to the time when the terminal device initiates the periodic registration update, and paging to the terminal device cannot be initiated, but the terminal device is reachable substantially within the time period, so that downlink data cannot be received in time under the condition that the terminal device is reachable, and the communication efficiency of the terminal device is reduced.

The present application provides various implementation methods to solve the above-found problems, and specific reference may be made to the method embodiments described below.

It should be noted that, the terms and steps mentioned in the embodiments of the present application may be used for reference and reference, the same or description is not repeated, and the execution sequence of the steps in the embodiments may be interchanged without limitation. The embodiments of the present application may be applied to a 5G communication system, and may also be applied to a communication system of subsequent evolution, without limitation.

Further, the timer duration referred to herein may refer to the length of time from the timer starting to the timer expiring.

As shown in fig. 4, an embodiment of the present application provides a communication method, which may be applied to the communication system shown in fig. 1, and the method includes:

401. the terminal equipment receives the time length of the periodic RAN notification area updating monitoring timer from the RAN node.

The period of the periodic RAN notification area update monitoring timer may be referred to as a period or a timing duration of the periodic RAN notification area update monitoring timer, or may be referred to as a periodic RAN notification area update monitoring timer value. Specifically, the period RAN notifies the area update monitoring timer duration to be a time length, for example, 10 minutes, or may be information corresponding to the time length, for example, a count value corresponding to the time length, for example, the count value corresponding to 10 minutes is 5.

In one example, when the periodic RAN notification area update monitoring timer is implemented by using a counter, the count is increased by 1 to represent 2 minutes, and if the counter counts to a count value 5 corresponding to the time length, the timer times out.

The duration of the periodic RAN notification area update monitoring timer may be used to set the periodic RAN notification area update monitoring timer. For example, the duration of the periodic RAN notification area update monitoring timer is set to be the duration of the periodic RAN notification area update monitoring timer, that is, when the periodic RAN notification area update monitoring timer reaches the duration of the periodic RAN notification area update monitoring timer or after the periodic RAN notification area update monitoring timer reaches the duration of the periodic RAN notification area update monitoring timer, the periodic RAN notification area update monitoring timer is overtime, and then the terminal device may be triggered to execute a corresponding action.

402. And the terminal equipment acquires the target period registration update timer duration according to the period RAN notification area update monitoring timer duration and the configured period registration update timer duration.

The period of the periodic registration update timer may also be referred to as a periodic registration update timer value (periodic registration update timer value).

The configured period registration update timer duration may refer to a period registration update timer duration configured by the AMF node to the terminal device.

The target period registration update timer duration may be used to set the period registration update timer, so that the time length from the start of the period registration update timer to the timeout is the target period registration update timer duration. For example, the period registration update timer duration is set to the target period registration update timer duration.

In one example, the target periodic registration update timer duration may be a difference between the configured periodic registration update timer duration and the periodic RAN notification area update monitoring timer duration. For example, the periodic registration update timer value minus the periodic RAN notification area update guard timer value.

Wherein, the duration of the periodic RAN notification area update monitoring timer may be carried in the RRC connection release message.

It should be noted that the obtaining in step 402 may be replaced by derivation (reduce), or step 402 may be replaced by: and the terminal equipment updates the duration of the monitoring timer according to the periodic RAN notification area, and updates the duration of the periodic registration updating timer. The specific implementation is similar to that described in step 402 above, and is not described again.

In the method provided by the above embodiment, the terminal device receives the time length of the periodic RAN notification area update monitoring timer from the RAN node, and obtains the time length of the target periodic registration update timer according to the time length of the periodic RAN notification area update monitoring timer and the configured periodic registration update timer, so that the problem that the periodic registration update timer of the terminal device and the mobile access timer of the AMF node cannot be synchronized in time, which is introduced by an elapsed time, can be solved, the states of the terminal devices on the two devices can be synchronized, and the communication efficiency of the terminal device can be improved.

As shown in fig. 5, an embodiment of the present application provides yet another communication method, which may be applied to the communication system shown in fig. 1, and the method includes:

501. the terminal equipment receives the time length of the periodic RAN notification area updating monitoring timer from the RAN node.

Wherein, the period of the periodic RAN notification area update monitoring timer may be carried in an RRC connection release message.

502. And the terminal equipment updates the duration of the monitoring timer according to the period RAN notification area and sets an initial value of the period registration updating timer.

In an example, the initial value may be a period RAN notification area update monitoring timer duration, that is, the period registration update timer starts to count from the period RAN notification area update monitoring timer duration, that is, the period RAN notification area update monitoring timer duration is used as the initial value to count until the period registration update timer expires after or when the period registration update timer reaches the period registration update timer duration.

In another example, the initial value may be a difference between a configured period registration update timer duration and a period RAN notification area update monitoring timer duration. Specifically, it is assumed that the periodic registration update timer is implemented in a countdown manner, i.e., starts counting down from an initial value, and for example, the periodic registration update timer is implemented in a counter which counts down from the initial value and times out when the counter counts up to 0. In this case, the initial value is a difference between the configured period registration update timer duration and the period RAN notification area update monitoring timer duration.

Step 501 and its related terms can refer to the related description in step 401, and are not described again.

In the method provided by the above embodiment, the terminal device receives the time length of the periodic RAN notification area update monitoring timer from the RAN node, and sets the initial value of the periodic registration update timer according to the time length of the periodic RAN notification area update monitoring timer, so that the problem that the periodic registration update timer of the terminal device and the mobile access timer of the AMF node cannot be synchronized in time, which is introduced by an elapsed time, can be solved, the states of the terminal devices on the two devices can be synchronized, and the communication efficiency of the terminal device can be improved.

As shown in fig. 6, an embodiment of the present application provides yet another communication method, which may be applied to the communication system shown in fig. 1, and the method includes:

601. the AMF node receives timer reference information from the RAN node.

The timer reference information may be an elapsed time, or may also be a period of time for which the RAN notifies the area to update the timer, or a period of time for which the RAN notifies the area to update the monitoring timer; the timer reference information may also be a difference between a time length of the periodic RAN notification area update monitoring timer and a time length of the periodic RAN notification area update timer, for example, the time length of the periodic RAN notification area update monitoring timer minus the time length of the periodic RAN notification area update timer is not limited.

The elapsed time may be a period of the periodic RAN notification area update timer, or a period of the periodic RAN notification area update monitoring timer, or a difference between the period of the periodic RAN notification area update monitoring timer and the period of the periodic RAN notification area update timer, which is not limited.

602. And the AMF node acquires the time length of the target mobile reachable timer according to the timer reference information.

The target mobile reachable timer duration may be used to set the mobile reachable timer, so that the time length from the start of the mobile reachable timer to the time-out is the target mobile reachable timer duration. For example, the movement reachable timer duration is set to the target movement reachable timer duration, i.e., the movement reachable timer times out when or after the movement reachable timer times out to the target movement reachable timer duration.

Specifically, step 602 may include: and the AMF node acquires the time length of the target mobile reachable timer according to the timer reference information and the time length of the normal mobile reachable timer.

Specifically, the duration of the normal mobile reachable timer may refer to a duration from when the AMF node senses that the terminal device changes to the CM-IDLE state to when the AMF node determines that the terminal device is unreachable. Specifically, the determination may be made by the AMF node according to the period registration update timer duration allocated by the AMF node to the terminal device.

In one example, the target mobile reachable timer duration may be a difference between the normal mobile reachable timer duration and the timer reference information, e.g., the normal mobile reachable timer duration minus the timer reference information.

It should be noted that the target movement reachable timer duration and the normal movement reachable timer duration may be time lengths, or may be information corresponding to the time lengths, for example, count values corresponding to the time lengths, which may be referred to in the description of the embodiment shown in fig. 4, and are not described again.

Alternatively, the obtaining in step 602 may be replaced by deriving, or step 602 may be replaced by: and the AMF node updates the time length of the mobile reachable timer according to the timer reference information, for example, the current time length of the mobile reachable timer is the time length A, and the AMF node updates the time length of the mobile reachable timer to be the time length B according to the timer reference information.

Wherein, the timer reference information may be carried in the N2 UE context release request message.

In the method provided in the foregoing embodiment, the AMF node receives timer reference information from the RAN node, and obtains a target mobile reachable timer duration according to the timer reference information, where when the timer reference information is a periodic RAN notification area update timer duration or a periodic RAN notification area update monitoring timer duration, a problem that a periodic registration update timer of the terminal device and a mobile reachable timer of the AMF node introduced by an elapsed time cannot be synchronized in time can be solved, so as to synchronize states of the terminal devices on the two devices, and improve communication efficiency of the terminal device; when the timer reference information is the difference between the time length of the periodic RAN notification area updating monitoring timer and the time length of the periodic RAN notification area updating timer, the periodic registration updating timer of the terminal equipment and the mobile accessible timer of the AMF node can be better synchronized in time under the condition that the terminal equipment is not modified, the states of the terminal equipment on the two equipment are synchronized more timely, and the communication efficiency of the terminal equipment is improved.

As shown in fig. 7, an embodiment of the present application provides yet another communication method, which may be applied to the communication system shown in fig. 1, and the method includes:

701. the AMF node receives timer reference information from the RAN node.

The timer reference information may refer to the relevant description in step 601, and is not described again.

702. And the AMF node sets an initial value of the mobile reachable timer according to the timer reference information.

The initial value may be the timer reference information, or a difference between the time length of the normally moving reachable timer and the timer reference information, for example, the time length of the normally moving reachable timer is subtracted from the timer reference information, and the setting of the specific initial value is similar to the implementation manner in step 502, and is not described again.

In the method provided by the embodiment, the AMF node receives timer reference information from the RAN node, and sets an initial value of the mobile reachable timer according to the timer reference information, wherein when the timer reference information is a period RAN notification area update timer duration or a period RAN notification area update monitoring timer duration, a problem that a period registration update timer of the terminal device and a mobile accessible timer of the AMF node cannot be synchronized in time, which are introduced by an elapsed time, can be solved, so that states of the terminal devices on the two devices are synchronized, and communication efficiency of the terminal device is improved; when the timer reference information is the difference between the time length of the periodic RAN notification area updating monitoring timer and the time length of the periodic RAN notification area updating timer, the periodic registration updating timer of the terminal equipment and the mobile accessible timer of the AMF node can be better synchronized in time under the condition that the terminal equipment is not modified, the states of the terminal equipment on the two equipment are synchronized more timely, and the communication efficiency of the terminal equipment is improved.

As shown in fig. 8, an embodiment of the present application provides yet another communication method, which may be applied to the communication system shown in fig. 1, and the method includes:

801. the RAN node obtains timer reference information.

The timer reference information may be a period of the periodic RAN notification area update timer, or a period of the periodic RAN notification area update monitoring timer, or a difference between the period of the periodic RAN notification area update monitoring timer and the period of the periodic RAN notification area update timer, for example, the period of the periodic RAN notification area update monitoring timer minus the period of the periodic RAN notification area update timer.

802. The RAN node sends timer reference information to the AMF node.

The timer reference information may be used for setting a mobile reachabitable timer by the AMF node. For example, an initial value or duration of the mobile reachabitability timer may be set, as shown in the embodiment of fig. 6 or 7.

Optionally, the method further includes:

803. the RAN node sends a periodic RAN notification to the terminal equipment, and the time length of the area updating monitoring timer is sent to the terminal equipment.

The period RAN notifies the duration of the area update monitoring timer to be used for the terminal device to set the period registration update timer, so as to solve the problem that the period registration update timer of the terminal device introduced by the elapsed time and the mobile accessible timer of the AMF node cannot be synchronized in time.

Specifically, the duration of the periodic RAN notification area update monitoring timer may be carried in the RRC connection release message.

It should be noted that, the execution sequence of the above steps may be adjusted, and is not limited.

In the method provided by the embodiment, the RAN node obtains the timer reference information and sends the timer reference information to the AMF node, so that the AMF node sets a mobile accessible timer according to the timer reference information, thereby making the unreachable time of the terminal device on the AMF node more reasonable and improving the communication efficiency of the terminal device.

As shown in fig. 8a, an embodiment of the present application provides yet another communication method, which may be applied to the communication system shown in fig. 1, and the method includes:

801a, the RAN node obtains the duration of the periodic RAN notification area update monitoring timer.

802a, the RAN node sends a periodic RAN notification to the terminal device to update the duration of the monitoring timer.

The duration of the periodic RAN notification area update monitoring timer may be used for the terminal device to set a periodic registration update timer, and may be specifically carried in an RRC connection release message.

In the method provided by the embodiment, the RAN node obtains the duration of the periodic RAN notification area update monitoring timer, and sends the duration of the periodic RAN notification area update monitoring timer to the terminal device, so that the terminal device sets the periodic registration update timer according to the duration of the periodic RAN notification area update monitoring timer, thereby solving the problem that the periodic registration update timer of the terminal device introduced by the elapsed time and the mobile accessible timer of the AMF node cannot be synchronized in time, and improving the communication efficiency of the terminal device.

As shown in fig. 9, an embodiment of the present application provides yet another communication method, which may be applied to the communication system shown in fig. 1, and the method includes:

901. the terminal equipment obtains the time length of the periodic RAN notification area updating timer.

The period of the periodic RAN notification area update timer may be referred to as a periodic RAN notification area update timer value or a period or a timing duration. Specifically, the duration of the periodic RAN notification area update timer may be a time length, or may be information corresponding to the time length, for example, a count value corresponding to the time length, which may be referred to the related description in the embodiment shown in fig. 4 and is not described again.

In addition, the duration of the periodic RAN notification area update timer may be configured to the terminal device by the RAN node, for example, may be carried in an RRC connection release message, or may be configured in advance on the terminal device. Therefore, the obtaining in step 901 may be obtained from the memory of the terminal device or from the RAN node, and is not limited.

902. And the terminal equipment acquires the time length of the target periodic registration update timer according to the time length of the periodic RAN notification area update timer and the configured periodic registration update timer.

The target period registration update timer duration may be used to set a period registration update timer, for example, the period registration update timer duration is set as the target period registration update timer duration, that is, a time length from starting to timeout of the period registration update timer is set as the target period registration update timer duration.

The target period registration update timer duration may be a difference between the configured period registration update timer duration and the period RAN notification area update timer duration, for example, the configured period registration update timer duration minus the period RAN notification area update timer duration.

For the configured duration of the periodic registration update timer, reference may be made to the relevant description in the embodiment shown in fig. 4, which is not described again.

In the method provided by the embodiment, the terminal device obtains the time length of the periodic RAN notification area update timer, and obtains the time length of the target periodic registration update timer according to the time length of the periodic RAN notification area update timer and the configured periodic registration update timer, so that the problem that the periodic registration update timer of the terminal device and the mobile accessible timer of the AMF node cannot be synchronized in time, which is introduced by an elapsed time, is solved, and the communication efficiency of the terminal device is further improved.

As shown in fig. 10, an embodiment of the present application provides yet another communication method, which may be applied to the communication system shown in fig. 1, and the method includes:

1001. the terminal equipment obtains the time length of the periodic RAN notification area updating timer.

The duration of the periodic RAN notification area update timer and step 1001 may refer to the relevant description in the embodiment shown in fig. 9, and are not described again.

1002. And the terminal equipment sets an initial value of the periodic registration updating timer according to the time length of the periodic RAN notification area updating timer.

The initial value may be a period of the periodic RAN notification area update timer, or a difference between the configured period of the periodic RAN notification area update timer and the period of the periodic RAN notification area update timer, for example, the configured period of the periodic RAN notification area update timer minus the period of the periodic RAN notification area update timer, and the setting of the specific initial value is similar to the implementation manner in step 502 and is not described again.

In the method provided by the embodiment, the terminal device obtains the time length of the periodic RAN notification area update timer, and sets the initial value of the periodic registration update timer according to the time length of the periodic RAN notification area update timer, so that the problem that the periodic registration update timer of the terminal device and the mobile accessible timer of the AMF node cannot be synchronized in time, which is introduced by an elapsed time, is solved, and the communication efficiency of the terminal device is further improved.

As shown in fig. 11, an embodiment of the present application provides yet another communication method, which may be applied to the communication system shown in fig. 1, and the method includes:

1101. the terminal device receives an RRC connection release message from the RAN node.

The RRC connection release message may carry a duration of a periodic RAN notification area update timer, where the duration of the periodic RAN notification area update timer may be configured to the terminal device by the RAN node, and may be referred to as the configured duration of the periodic RAN notification area update timer.

1102. And the terminal equipment sets the state of the terminal equipment according to the RRC connection release message.

In one example, when the terminal device receives the RRC connection release message, the terminal device transitions from the RRC connected state to the RRC inactive state.

1103. When the terminal device is switched from the RRC connected state to the RRC inactive state, the terminal device starts a periodic RAN notification area update timer and a periodic registration update timer at the same time.

The duration of the periodic RAN notification area update timer is a configured duration of the periodic RAN notification area update timer, for example, the RAN node is configured to the terminal device, and the periodic RAN notification area update timer may start timing from 0. The timing duration of the periodic registration update timer is a configured periodic registration update timer duration, for example, the AMF node is configured for the terminal device, and the periodic registration update timer may be counted from 0.

It should be noted that, at the same time, the same time may refer to the same time, or the difference between the two start times is smaller than the preset value, or the difference between the two start times is negligible compared with the duration of the two timers, which is not limited.

In the method provided in the above embodiment, the terminal device receives the RRC connection release message from the RAN node, and sets the state of the terminal device according to the RRC connection release message, and when the terminal device is switched from the RRC connected state to the RRC inactive state, the terminal device starts the periodic RAN notification area update timer and the periodic registration update timer at the same time, thereby solving the problem that the periodic registration update timer of the terminal device introduced by the elapsed time cannot be synchronized with the mobile accessible timer of the AMF node in time, and further improving the communication efficiency of the terminal device.

As shown in fig. 12, an embodiment of the present application provides yet another communication method, which may be applied to the communication system shown in fig. 1, and the method includes:

1201. the terminal device receives an RRC connection release message from the RAN node.

1202. And the terminal equipment simultaneously starts a periodic RAN notification area updating timer and a periodic registration updating timer according to the RRC connection release message.

In one example, when the terminal device receives the RRC connection release message, the terminal device starts a periodic RAN notification area update timer and a periodic registration update timer at the same time.

In another example, when the terminal device receives the RRC connection release message, the terminal device transitions from the RRC connected state to the RRC inactive state and starts the periodic RAN notification area update timer and the periodic registration update timer at the same time.

It should be noted that, the same time may refer to the same time, or the difference between the two times may be negligible compared with the duration of the two timers, which is not limited.

The duration of the periodic RAN notification area update timer is a configured duration of the periodic RAN notification area update timer, for example, the RAN node is configured to the terminal device, and the periodic RAN notification area update timer may start timing from 0. The period registration update timer duration is a configured period registration update timer duration, for example, the AMF node is configured for the terminal device, and the period registration update timer may be counted from 0.

In the method provided in the foregoing embodiment, the terminal device receives the RRC connection release message from the RAN node, and simultaneously starts the periodic RAN notification area update timer and the periodic registration update timer according to the RRC connection release message, so that the problem that the periodic registration update timer of the terminal device introduced by the elapsed time and the mobile accessible timer of the AMF node cannot be synchronized in time is solved, and the communication efficiency of the terminal device is further improved.

As shown in fig. 13, an embodiment of the present application provides another communication method, which may be applied to the communication system shown in fig. 1, and the method includes:

1301. when the RAN node releases the RRC connection between the RAN node and the terminal equipment, the RAN node sets the state of the terminal equipment to be an RRC Inactive state, and starts a periodic RAN notification area updating monitoring timer.

In one example, there is no data transmission between the terminal device and the RAN node for a preset time, and the RAN node may release the RRC connection between it and the terminal device.

1302. The RAN node sends an RRC connection release message to the terminal device.

Wherein, the RRC connection release message carries a periodic RAN notification area update guard timer duration.

Optionally, the RRC connection release message further carries a duration of a RRC Inactive timer configured for the terminal device, that is, a duration of a periodic RAN notification area update timer.

1303. When the terminal equipment receives the RRC connection release message, the terminal equipment enters an RRC Inactive state and starts a periodic RAN notification area update timer.

The terminal device entering the RRC Inactive state may be the terminal device switching from the RRC connected state to the RRC Inactive state, or the terminal device entering the RRC Inactive state from the RRC connected state, without limitation.

1304. When the periodic RAN notifies the area update timer to time out, the terminal device sends an RRC Connection Resume Request (RRC Connection Resume Request) message to the RAN node.

For example, if the RRC connection recovery request message fails to be sent due to weak signal strength of the terminal device or an error in data transmission, the terminal device enters a CM-IDLE state and starts a Periodic registration update timer, that is, step 1305 is executed.

Illustratively, the criterion for the terminal device to determine the failure of sending the RRC connection recovery request message may include: the terminal device does not receive a message sent by the RAN node for confirming RRC connection recovery within a preset time period, or a Protocol stack of a lower layer of an RRC layer of the terminal device does not receive a confirmation message sent by the RAN in a corresponding Protocol stack (e.g., a Packet Data Convergence Protocol (PDCP) layer or a Radio Link Control (RLC) layer) within the preset time period, so as to inform the RRC layer of the manner, which is not limited.

1305. When the sending of the RRC connection recovery request message fails, the terminal equipment enters a CM-IDLE state and starts a periodic registration updating timer.

Optionally, the duration of the periodic registration update timer is calculated according to the duration of the periodic RAN notification area update monitoring timer, which can be referred to the related description in the embodiment shown in fig. 4. Specifically, the time duration may be calculated when the periodic RAN notification area update monitoring timer is received, or may be unlimited before the periodic registration update timer is started.

In one example, the period registration update timer started in step 1305 is the period registration update timer configured by the AMF node for the terminal device — the period RAN notifies the area update monitoring timer.

Optionally, the initial value of the periodic registration update timer is set according to the duration of the periodic RAN notification area update monitoring timer, which may specifically refer to the relevant description in the embodiment shown in fig. 5 and is not described again.

For the RAN node, if the RRC connection recovery request message sent by the terminal device is not received when the periodic RAN notification area update monitoring timer times out, the RAN node initiates AN access network release (AN release) procedure, i.e., executes step 1306.

1306. The RAN node sends an N2 UE Context Release Request message to the AMF node, which contains timer reference information.

The timer reference information may be a period of time for the RAN to notify the area to update the monitoring timer.

1307. And the AMF node deduces the mobile reachable timer duration according to the timer reference information.

In one example, the mobile reachabitable timer duration used by the AMF node is the mobile reachabitable timer duration (i.e., normal mobile reachabitable timer value) predetermined by the AMF node — the periodic RAN notification area update monitoring timer duration.

Alternatively, step 1307 is: the AMF node sets an initial value of a mobile reachabitable timer according to the timer reference information, which is similar to the method of the embodiment shown in fig. 5 and is not described again.

In the method provided by the embodiment, the terminal device sets the periodic registration update timer according to the duration of the periodic RAN notification area update monitoring timer, so that the problem that the periodic registration update timer of the terminal device introduced by the elapsed time and the mobile accessible timer of the AMF node cannot be synchronized in time is solved, the states of the terminal devices on the two devices are synchronized, and the communication efficiency of the terminal device is improved.

As shown in fig. 14, an embodiment of the present application provides another communication method, which may be applied to the communication system shown in fig. 1, and the method includes:

1401. when the RAN node releases the RRC connection between the RAN node and the terminal equipment, the RAN node sets the state of the terminal equipment to be an RRC Inactive state, and starts a periodic RAN notification area updating monitoring timer.

For example, if there is no data transmission between the terminal device and the RAN node for a certain time, the RAN node may release its RRC connection with the terminal device.

1402. The RAN sends an RRC connection release message to the terminal device.

Optionally, the RRC connection release message carries a period RAN notification area update timer duration, where the period RAN notification area update timer duration may be configured by the RAN node for the terminal device.

1403. When the terminal equipment receives the RRC connection release message, the terminal equipment enters an RRC Inactive state and starts a periodic RAN notification area update timer.

1404. When the periodic RAN notifies the area update timer to time out, the terminal equipment sends an RRC connection recovery request message to the RAN node.

For example, if the RRC connection recovery request message fails to be sent due to a weak signal strength of the terminal device or an error in data transmission, the terminal device enters a CM-IDLE state and starts a periodic registration update timer, i.e., step 1405 is executed. Specifically, the related description in the embodiment shown in fig. 13 may be referred to for the failure of sending the RRC connection recovery request message, and is not repeated.

1405. When the sending of the RRC connection recovery request message fails, the terminal equipment enters a CM-IDLE state and starts a periodic registration updating timer.

Optionally, the duration of the periodic registration update timer is calculated according to a periodic RAN notification area update timer.

In one example, the period registration update timer duration started by the terminal device in step 1405 is the period registration update timer duration configured by the AMF node for the terminal device — the period RAN notification area update timer duration.

Optionally, the initial value of the periodic registration update timer is set according to the duration of the periodic RAN notification area update timer, which may refer to the relevant description in the embodiment shown in fig. 5 and is not described again.

For the RAN node, when the periodic RAN notification area update monitoring timer times out, the RRC connection recovery request message sent by the terminal device is not received yet, and the RAN node initiates AN release procedure, that is, step 1506 is executed.

1406. The RAN node sends an N2 UE Context Release Request message to the AMF node, the message including timer reference information.

The timer reference information may be a time length of a periodic RAN notification area update timer, or a time length of a periodic RAN notification area update monitoring timer, and at this time, the timer reference information may also be referred to as an elapsed time.

1407. And the AMF node deduces the mobile reachable timer duration according to the timer reference information.

In one example, the Mobile reachable timer duration actually used by the AMF node (i.e., the normal Mobile reachable timer value) is the Mobile reachable timer duration predetermined by the AMF node — the timer reference information.

Alternatively, step 1407 is: the AMF node sets an initial value of a mobile reachabitable timer according to the timer reference information, which is similar to the method of the embodiment shown in fig. 5 and is not described again.

In the method provided by the embodiment, the terminal device sets the periodic registration update timer according to the duration of the periodic RAN notification area update timer, so that the problem that the periodic registration update timer of the terminal device introduced by the elapsed time and the mobile accessible timer of the AMF node cannot be synchronized in time is solved, the states of the terminal devices on the two devices are synchronized, and the communication efficiency of the terminal device is improved.

It should be noted that, the setting of the periodic registration update timer in step 1405 is to update the time length of the timer according to the periodic RAN notification area, and the setting of the mobile accessible timer in step 1407 is according to the timer reference information, where the timer reference information is the time length of the periodic RAN notification area update monitoring timer, the devices of the two timers are different, but because the difference between the time length of the periodic RAN notification area update timer and the time length of the periodic RAN notification area update monitoring timer is small, the problem that the two timers cannot be synchronized in time can be solved as well.

The embodiment of the present application provides another communication method, which can be applied to the communication system shown in fig. 1, and the method includes the steps identical to those in steps 1401 and 1407, except that:

the duration of the Periodic registration update timer started in step 1405 is the duration of the Periodic registration update timer configured by the AMF node to the terminal device, and in addition, the initial value of the timer is 0.

Further, the timer reference information is a difference between a period of the Periodic RAN notification area update timer and a period of the Periodic RAN notification area update timer, for example, the period of the Periodic RAN notification area update timer minus the period of the Periodic RAN notification area update timer.

In the method provided in the above embodiment, the mobile accessible timer is set by the AMF node according to the difference between the duration of the Periodic RAN notification area update timer and the duration of the Periodic RAN notification area update timer, so that the Periodic registration update timer of the terminal device and the mobile accessible timer of the AMF node are better synchronized in time without modifying the terminal device, and thus the states of the terminal devices on the two devices are synchronized more timely, and the communication efficiency of the terminal device is improved.

As shown in fig. 15, an embodiment of the present application provides another communication method, which may be applied to the communication system shown in fig. 1, and the method includes:

1501. when the RAN node releases the RRC connection between the RAN node and the terminal equipment, the RAN node sets the state of the terminal equipment to be an RRC Inactive state, and starts a periodic RAN notification area updating monitoring timer.

For example, the RAN node may release the RRC connection if there is no data transmission between the terminal device and the RAN node for a certain time.

1502. The RAN node sends an RRC connection release message to the terminal device.

1503. And the terminal equipment sets the state of the terminal equipment according to the RRC connection release message.

1504. When the terminal device is switched from the RRC connected state to the RRC inactive state, the terminal device starts a periodic RAN notification area update timer and a periodic registration update timer at the same time.

1505. When the periodic RAN notifies the area update timer to time out, the terminal equipment sends an RRC connection recovery request message to the RAN node.

For the RAN node, if the RRC connection recovery request message sent by the terminal device is not received when the periodic RAN notification area update monitoring timer times out, the RAN node initiates AN release procedure, i.e., executes step 1506.

1506. The RAN node sends an N2 UE Context Release Request message to the AMF node, which contains timer reference information.

The timer reference information may be a duration of a periodic RAN notification area update monitoring timer, or a duration of a periodic RAN notification area update timer.

1507. And the AMF node deduces the mobile reachable timer duration according to the timer reference information.

Alternatively, step 1507 is: the AMF node sets an initial value of a mobile reachabitable timer according to the timer reference information, which is similar to the method of the embodiment shown in fig. 5 and is not described again.

It should be noted that, the steps in the embodiment shown in fig. 15 and the related timer can be referred to the related description in the embodiment shown in fig. 11, and are not described again.

In the method provided in the foregoing embodiment, the terminal device receives the RRC connection release message from the RAN node, and sets the state of the terminal device according to the RRC connection release message, and when the terminal device is switched from the RRC connected state to the RRC inactive state, the terminal device starts the periodic RAN notification area update timer and the periodic registration update timer at the same time, so as to solve the problem that the periodic registration update timer of the terminal device introduced by the elapsed time and the mobile accessible timer of the AMF node cannot be synchronized in time, and improve the communication efficiency of the terminal device.

As shown in fig. 16, an embodiment of the present application provides a communication method, which may be applied to the communication system shown in fig. 1, and the method includes:

the steps 1601-1602 and 1605-1607 are the same as 1501-1502 and 1607, which are not described again. Further, the different steps are as follows.

1603. And the terminal equipment simultaneously starts a periodic RAN notification area updating timer and a periodic registration updating timer according to the RRC connection release message.

1604. The terminal device transitions from the RRC connected state to the RRC inactive state.

Wherein, steps 1603 and 1604 may be executed simultaneously or adjusted in sequence, without limitation.

In addition, step 1603 and the above mentioned timer can refer to the related description in the embodiment shown in fig. 12, and are not described again.

In the method provided in the foregoing embodiment, the terminal device receives the RRC connection release message from the RAN node, and simultaneously starts the periodic RAN notification area update timer and the periodic registration update timer according to the RRC connection release message, so as to solve the problem that the periodic registration update timer of the terminal device introduced by the elapsed time and the mobile accessible timer of the AMF node cannot be synchronized in time, and improve the communication efficiency of the terminal device.

The above-mentioned scheme provided by the embodiment of the present invention is introduced mainly from the perspective of terminal equipment, RAN node, AMF node, and their interaction. It is understood that the RAN node, the AMF node, and the terminal device each include a corresponding hardware structure and/or a corresponding software module for performing each function. Those of skill in the art would 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 performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

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

In the case of dividing each functional module according to each function, the embodiment of the present application provides a communication apparatus that can execute the method or action of the terminal device in the above-described embodiments, for example, the method in the embodiment shown in fig. 4 or 13.

As shown in fig. 17, there is provided a schematic structural diagram of a communication apparatus, which may be a terminal device or a chip or a system on a chip on a terminal device, the apparatus including: a transceiver unit 1701 and a processing unit 1702.

A transceiver unit 1701, configured to receive a period RAN notification area update monitoring timer duration from a RAN node in a radio access network;

a processing unit 1702, configured to obtain a target period registration update timer duration according to the period RAN notification area update monitoring timer duration and the configured period registration update timer duration, where the target period registration update timer duration is used to set a period registration update timer.

The target period registration update timer duration may be a difference between a configured period registration update timer duration and the period RAN notification area update monitoring timer duration.

Optionally, the period RAN notifies the duration of the area update monitoring timer to be carried in a radio resource control RRC connection release message.

It should be noted that the transceiver unit may be replaced by a transceiver, such as a radio frequency module or an antenna, and the processing unit may be replaced by one or more processors, without limitation.

The device provided by the above embodiment can solve the problem that the periodic registration update timer of the terminal device and the mobile accessible timer of the AMF node cannot be synchronized in time, which are introduced by the elapsed time, by receiving the periodic RAN notification area update monitoring timer duration from the RAN node, and obtaining the target periodic registration update timer duration according to the periodic RAN notification area update monitoring timer duration and the configured periodic registration update timer duration, thereby synchronizing the states of the terminal devices on the two devices and improving the communication efficiency of the terminal device.

As shown in fig. 18, there is provided a schematic structural diagram of still another communication apparatus, which may be used to perform the actions of the terminal device involved in the foregoing embodiments, where the apparatus may be a terminal device or a chip or a system on a chip on a terminal device, and the apparatus includes: a transceiving unit 1801 and a processing unit 1802.

A transceiving unit 1801, configured to receive a period RAN notification area update monitoring timer duration from a RAN node;

a processing unit 1802, configured to set an initial value of a periodic registration update timer according to the duration of the periodic RAN notification area update monitoring timer.

Optionally, the initial value is a time length of the periodic RAN notification area update monitoring timer, or a difference between a configured time length of the periodic registration update timer and a time length of the periodic RAN notification area update monitoring timer.

The device provided by the embodiment can solve the problem that the periodic registration update timer of the terminal device introduced by the elapsed time and the mobile accessible timer of the AMF node cannot be synchronized in time by receiving the periodic RAN notification area update monitoring timer duration from the RAN node and setting the initial value of the periodic registration update timer according to the periodic RAN notification area update monitoring timer duration, thereby synchronizing the states of the terminal devices on the two devices and improving the communication efficiency of the terminal device.

As shown in fig. 19, there is provided a schematic structural diagram of a further communication device, which may be used for performing the actions of the AMF node in the above embodiments, and which may be the AMF node or a chip or a system on chip on the AMF node, and the device includes: a transceiver 1901 and a processor 1902.

A transceiver 1901, configured to receive timer reference information from a RAN node, where the timer reference information is a period of a periodic RAN notification area update timer, or a difference between a period of the periodic RAN notification area update monitoring timer and a period of the periodic RAN notification area update timer;

the processing unit 1902 is configured to obtain a target mobile reachable timer duration according to the timer reference information, where the target mobile reachable timer duration is used to set a mobile reachable timer.

Optionally, the processing unit 1902 is further configured to: and acquiring the time length of the target mobile reachable timer according to the timer reference information and the time length of the normal mobile reachable timer.

Optionally, the target movement reachable timer duration is a difference between the normal movement reachable timer duration and the timer reference information.

Optionally, the timer reference information is carried in an N2 UE context release request message.

It should be noted that the transceiver unit may be replaced by a communication interface, which may communicate with the RAN node in a wired or wireless manner, and the processing unit may be replaced by one or more processors, without limitation.

The apparatus provided in the foregoing embodiment receives the timer reference information from the RAN node, and obtains the time length of the target mobile reachable timer according to the timer reference information, where when the timer reference information is the time length of the periodic RAN notification area update timer or the time length of the periodic RAN notification area update monitoring timer, the apparatus can solve the problem that the periodic registration update timer of the terminal device introduced by the elapsed time and the mobile accessible timer of the AMF node cannot be synchronized in time, so as to synchronize the states of the terminal devices on the two devices, and improve the communication efficiency of the terminal device; when the timer reference information is the difference between the time length of the periodic RAN notification area updating monitoring timer and the time length of the periodic RAN notification area updating timer, the periodic registration updating timer of the terminal equipment and the mobile accessible timer of the AMF node can be better synchronized in time under the condition that the terminal equipment is not modified, the states of the terminal equipment on the two equipment are synchronized more timely, and the communication efficiency of the terminal equipment is improved.

As shown in fig. 20, there is provided a schematic structural diagram of a further communication device, which may be used to perform the actions of the AMF node in the above embodiments, and which may be the AMF node or a chip or a system on chip on the AMF node, and the device includes: a transceiver 2001 and a processing unit 2002.

A transceiver unit 2001, configured to receive timer reference information from a RAN node, where the timer reference information is a period of a periodic RAN notification area update monitoring timer, a period of a periodic RAN notification area update timer, or a difference between the period of the periodic RAN notification area update monitoring timer and the period of the periodic RAN notification area update timer;

a processing unit 2002 for setting an initial value of a mobile reachable timer according to the timer reference information.

Optionally, the initial value is the timer reference information, or a difference between a normal movement reachable timer duration and the timer reference information.

It should be noted that the transceiver unit may be replaced with a communication interface that may communicate with the AMF node in a wired or wireless manner, and the processing unit may be replaced with one or more processors, without limitation.

The apparatus provided in the foregoing embodiment sets the initial value of the mobile reachable timer by receiving the timer reference information from the RAN node, and according to the timer reference information, where when the timer reference information is a period RAN notification area update timer duration or a period RAN notification area update monitoring timer duration, a problem that a period registration update timer of the terminal device and a mobile access timer of the AMF node introduced by an elapsed time cannot be synchronized in time can be solved, and states of the terminal device on the two devices are synchronized, thereby improving communication efficiency of the terminal device; when the timer reference information is the difference between the time length of the periodic RAN notification area updating monitoring timer and the time length of the periodic RAN notification area updating timer, the periodic registration updating timer of the terminal equipment and the mobile accessible timer of the AMF node can be better synchronized in time under the condition that the terminal equipment is not modified, the states of the terminal equipment on the two equipment are synchronized more timely, and the communication efficiency of the terminal equipment is improved.

As shown in fig. 21, there is provided a schematic structural diagram of a further communication apparatus, which may be used to perform the actions of the RAN node involved in the foregoing embodiments, and the apparatus may be a RAN node or a chip or a system on chip on the RAN node, and the apparatus includes: a processing unit 2101 and a transceiving unit 2102.

A processing unit 2101, configured to obtain timer reference information, where the timer reference information is a time length of a periodic RAN notification area update timer, or a difference between the time length of the periodic RAN notification area update monitoring timer and the time length of the periodic RAN notification area update timer;

a transceiving unit 2102 configured to transmit the timer reference information to the AMF node.

Optionally, the timer reference information is carried in a context release request message.

Optionally, the transceiving unit 2102 is further configured to: and sending a periodic RAN notification area update monitoring timer duration to the terminal equipment.

The device provided by the embodiment sends the timer reference information to the AMF node by obtaining the timer reference information, so that the AMF node sets the mobile accessible timer according to the timer reference information AMF node, the inaccessible time of the terminal equipment on the AMF node is more reasonable, and the communication efficiency of the terminal equipment is improved.

As shown in fig. 22, there is provided a schematic structural diagram of a further communication apparatus, which may be used to perform the actions of the RAN node involved in the foregoing embodiments, and the apparatus may be a RAN node or a chip or a system on chip on the RAN node, and the apparatus includes: acquisition section 2201 and transmission/reception section 2202.

An obtaining unit 2201, configured to obtain a duration of a periodic radio access network RAN notification area update monitoring timer;

a transceiving unit 2202, configured to send the duration of the periodic RAN notification area update monitoring timer to a terminal device.

Optionally, the duration of the periodic RAN notification area update monitoring timer is carried in an RRC connection release message.

It is noted that the transceiver unit may be replaced by a transceiver, such as a radio frequency module or an antenna, and the obtaining unit may be replaced by one or more processors, without limitation.

The device provided by the above embodiment obtains the duration of the periodic RAN notification area update monitoring timer, and sends the duration of the periodic RAN notification area update monitoring timer to the terminal device, so that the terminal device sets the periodic registration update timer according to the duration of the periodic RAN notification area update monitoring timer, thereby solving the problem that the periodic registration update timer of the terminal device introduced by the elapsed time and the mobile accessible timer of the AMF node cannot be synchronized in time, and improving the communication efficiency of the terminal device.

As shown in fig. 23, there is provided a schematic structural diagram of another communication apparatus, which may be used to perform the actions of the terminal device involved in the foregoing embodiments, where the apparatus may be a terminal device or a chip or a system on a chip on a terminal device, and the apparatus includes: obtaining unit 012301 and processing unit 022302.

An obtaining unit 2301, configured to obtain a duration of a periodic RAN notification area update timer;

the processing unit 2302 is further configured to obtain a target period registration update timer duration according to the period RAN notification area update timer duration and the configured period registration update timer duration, where the target period registration update timer duration is used to set a period registration update timer.

Optionally, the target period registration update timer duration is a difference between a configured period registration update timer duration and the period RAN notification area update timer duration.

It is to be noted that the obtaining unit may be replaced by a processor, and the processing unit may be replaced by one or more processors, without limitation.

The device provided by the embodiment obtains the target periodic registration update timer duration by obtaining the periodic RAN notification area update timer duration and according to the periodic RAN notification area update timer duration and the configured periodic registration update timer duration, thereby solving the problem that the periodic registration update timer of the terminal device introduced by the elapsed time cannot be synchronized with the mobile accessible timer of the AMF node in time, and further improving the communication efficiency of the terminal device.

As shown in fig. 24, there is provided a schematic structural diagram of another communication apparatus, which may be used to perform the actions of the terminal device involved in the foregoing embodiments, where the apparatus may be a terminal device or a chip or a system on a chip on a terminal device, and the apparatus includes: an obtaining unit 2401 and a processing unit 2402.

An obtaining unit 2401, configured to obtain a duration of a periodic radio access network RAN notification area update timer;

the processing unit 2402 is configured to set an initial value of a periodic registration update timer according to the duration of the periodic RAN notification area update timer.

Optionally, the initial value is a time length of the periodic RAN notification area update timer, or a difference between a configured time length of the periodic registration update timer and a time length of the periodic RAN notification area update timer.

The device provided by the embodiment solves the problem that the periodic registration update timer of the terminal device and the mobile accessible timer of the AMF node cannot be synchronized in time, which is introduced by the elapsed time, by obtaining the time length of the periodic RAN notification area update timer and setting the initial value of the periodic registration update timer according to the time length of the periodic RAN notification area update timer, thereby improving the communication efficiency of the terminal device.

As shown in fig. 25, there is provided a schematic structural diagram of another communication apparatus, which may be used to perform the actions of the terminal device involved in the foregoing embodiments, where the apparatus may be a terminal device or a chip or a system on a chip on a terminal device, and the apparatus includes: a transceiver 2501 and a processing unit 2502.

A transceiving unit 2501, configured to receive an RRC connection release message from a RAN node;

a processing unit 2502, configured to set a state of the terminal device according to the RRC connection release message;

optionally, the processing unit 2502 is further configured to start a periodic RAN notification area update timer and a periodic registration update timer at the same time when the terminal device transitions from the RRC connected state to the RRC inactive state.

The device provided by the above embodiment sets the state of the terminal device according to the RRC connection release message by receiving the RRC connection release message from the RAN node, and when the terminal device is switched from the RRC connected state to the RRC inactive state, the terminal device starts the periodic RAN notification area update timer and the periodic registration update timer at the same time, thereby solving the problem that the periodic registration update timer of the terminal device introduced by the elapsed time and the mobile accessible timer of the AMF node cannot be synchronized in time, and further improving the communication efficiency of the terminal device.

As shown in fig. 26, there is provided a schematic structural diagram of another communication apparatus, which may be used to perform the actions of the terminal device involved in the foregoing embodiments, where the apparatus may be a terminal device or a chip or a system on a chip on a terminal device, and the apparatus includes: a transceiving unit 2601 and a processing unit 2602.

A transceiving unit 2601, configured to receive an RRC connection release message from a RAN node;

a processing unit 2602, configured to start a periodic RAN notification area update timer and a periodic registration update timer at the same time according to the RRC connection release message.

It should be noted that the transceiver unit may be a transceiver, such as a radio frequency module or an antenna, and the processing unit may be one or more processors, without limitation.

The device provided in the above embodiment receives the RRC connection release message from the RAN node, and starts the periodic RAN notification area update timer and the periodic registration update timer according to the RRC connection release message, so as to solve the problem that the periodic registration update timer of the terminal device introduced by the elapsed time cannot be synchronized with the mobile accessible timer of the AMF node in time, thereby improving the communication efficiency of the terminal device.

As shown in fig. 27, a further communication device is provided and may include a processor 2701 and a communication interface 2702, the processor 2701 is coupled with a memory, and the processor 2701 is configured to invoke a program in the memory to execute the method of the terminal equipment or the RAN node or the AMF node in the foregoing embodiments.

The processor 2701 may be one or more, and may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention. For example: one or more microprocessors (DSP), or one or more Field Programmable Gate Arrays (FPGA).

A communication interface 2702, which is used for the processor 2701 to communicate with a memory.

Alternatively, the communication device includes the above-mentioned Memory 2703, and the Memory 2703 may be one or more of a Read-Only Memory (ROM) or other types of static storage devices that can store static information and instructions, a Random Access Memory (RAM) or other types of dynamic storage devices that can store information and instructions, an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), a magnetic Disc storage medium or other magnetic storage device, 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, but is not limited thereto.

The memory 2703 and the processor 2701 may communicate with each other through the communication interface 2702 without limitation.

Embodiments of the present application provide a program, which when executed by a processor, is configured to perform the method of the terminal device or the RAN node or the AMF node in the above embodiments.

An embodiment of the present application provides a computer-readable storage medium including the program described above.

An embodiment of the present application provides a system, including: RAN nodes and AMF nodes. Wherein, the RAN node and the AMF node may be respectively configured to perform corresponding actions in the above-described embodiments of the methods. Further, the system may further include a terminal device, and the terminal device may be configured to execute corresponding actions in the foregoing method embodiments, which is not described again.

The steps of a method or algorithm described in connection with the disclosure herein may be embodied in hardware or in software instructions executed by a processor. The software instructions may be comprised of corresponding software modules that may be stored in Random Access Memory (RAM), flash Memory, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), registers, a hard disk, a removable disk, a compact disc Read Only Memory (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in a core network interface device. Of course, the processor and the storage medium may reside as discrete components in a core network interface device.

In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.

Through the above description of the embodiments, those skilled in the art will clearly understand that the present application can be implemented by software plus necessary general hardware, and certainly, the present application can also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solutions of the present application may be substantially implemented or a part of the technical solutions contributing to the prior art may be embodied in the form of a software product, where the computer software product is stored in a readable storage medium, such as a floppy disk, a hard disk, or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods described in the embodiments of the present application.

Claims

1. A method of communication, comprising:

the terminal equipment receives a period RAN notification area update monitoring timer duration from a radio access network RAN node;

the terminal equipment obtains a target period registration update timer duration according to the period RAN notification area update monitoring timer duration and the period registration update timer duration configured for the terminal, wherein the target period registration update timer duration is used for setting a period registration update timer;

wherein the target period registration update timer duration is a difference between the configured period registration update timer duration and the period RAN notification area update monitoring timer duration.

2. The communication method according to claim 1, wherein the periodic RAN notification area update monitoring timer duration is carried in a radio resource control, RRC, connection release message.

3. A method of communication, comprising:

the terminal equipment updates the duration of the monitoring timer according to the periodic RAN notification area and sets an initial value of a periodic registration updating timer;

the initial value is the time length of the periodic RAN notification area updating monitoring timer, or the difference value between the time length of the periodic registration updating timer configured for the terminal and the time length of the periodic RAN notification area updating monitoring timer.

4. The communication method according to claim 3, wherein the periodic RAN notification area update monitoring timer duration is carried in a Radio Resource Control (RRC) connection release message.

5. A method of communication, comprising:

an access and mobility management function (AMF) node receives timer reference information from a Radio Access Network (RAN) node, wherein the timer reference information is the time length of a periodic RAN notification area update timer or the difference value between the time length of the periodic RAN notification area update monitoring timer and the time length of the periodic RAN notification area update timer;

the AMF node obtains a target mobile reachable timer duration according to the timer reference information, wherein the target mobile reachable timer duration is used for setting a mobile reachable timer;

wherein,

the AMF node obtains the time length of the target mobile reachable timer according to the timer reference information, and the method comprises the following steps:

and the AMF node acquires the time length of the target mobile reachable timer according to the timer reference information and the time length of the normal mobile reachable timer.

6. The communication method according to claim 5, wherein the target mobile reachable timer duration is a difference between the normal mobile reachable timer duration and the timer reference information.

7. A communication method according to any of claims 5-6, wherein the timer reference information is carried in an N2 UE context release request message.

8. A method of communication, comprising: an access and mobility management function (AMF) node receives timer reference information from a Radio Access Network (RAN) node, wherein the timer reference information is the time length of a periodic RAN notification area updating monitoring timer, the time length of the periodic RAN notification area updating timer or the difference value between the time length of the periodic RAN notification area updating monitoring timer and the time length of the periodic RAN notification area updating timer;

the AMF node sets an initial value of a mobile reachable timer according to the timer reference information;

the initial value is the timer reference information, or the difference between the normal movement reachable timer duration and the timer reference information.

9. The communication method according to claim 8, wherein the timer reference information is carried in an N2 UE context release request message.

10. A method of communication, comprising:

a Radio Access Network (RAN) node acquires timer reference information, wherein the timer reference information is the time length of a periodic RAN notification area update timer or the difference value between the time length of the periodic RAN notification area update monitoring timer and the time length of the periodic RAN notification area update timer;

the RAN node sends the timer reference information to an access and mobility management function (AMF) node, the AMF node is used for receiving the timer reference information from a Radio Access Network (RAN) node, and the timer reference information is a period RAN notification area update monitoring timer duration, a period RAN notification area update timer duration or a difference value between the period RAN notification area update monitoring timer duration and the period RAN notification area update timer duration; setting an initial value of a mobile reachable timer according to the timer reference information; the initial value is the timer reference information, or the difference between the normal movement reachable timer duration and the timer reference information.

11. The communications method of claim 10, wherein the timer reference information is carried in an N2 UE context release request message.

12. The communication method according to claim 10 or 11, characterized in that the method further comprises:

and the RAN node sends a periodic RAN notification area update monitoring timer duration to the terminal equipment.

13. The communications method of claim 12, wherein the periodic RAN notification area update monitoring timer duration is carried in a radio resource control, RRC, connection release message.

14. A method of communication, comprising:

a Radio Access Network (RAN) node acquires the duration of a periodic RAN notification area update monitoring timer;

the RAN node sends the periodic RAN notification area update monitoring timer duration to a terminal device,

the terminal equipment is used for notifying the time length of a regional update monitoring timer from a Radio Access Network (RAN) node by a periodic RAN, and acquiring the time length of a target periodic registration update timer according to the time length of the regional update monitoring timer notified by the periodic RAN and the time length of the periodic registration update timer configured for the terminal, wherein the time length of the target periodic registration update timer is used for setting the periodic registration update timer; wherein, the target period registration updating timer duration is a difference value between the configured period registration updating timer duration and the period RAN notification area updating monitoring timer duration;

or, the terminal device is configured to receive a periodic RAN notification area update monitoring timer duration from a radio access network RAN node; the terminal equipment updates the duration of the monitoring timer according to the periodic RAN notification area and sets an initial value of a periodic registration updating timer; the initial value is the time length of the periodic RAN notification area updating monitoring timer, or the difference value between the time length of the periodic registration updating timer configured for the terminal and the time length of the periodic RAN notification area updating monitoring timer.

15. The communications method of claim 14, wherein the periodic RAN notification area update monitoring timer duration is carried in a radio resource control, RRC, connection release message.

16. A communications apparatus, comprising:

a receiving and sending unit, configured to receive a period RAN notification area update monitoring timer duration from a radio access network RAN node;

the processing unit is used for obtaining a target period registration update timer duration according to the period RAN notification area update monitoring timer duration and the period registration update timer duration configured for the terminal equipment, wherein the target period registration update timer duration is used for setting a period registration update timer;

and the target period registration updating timer duration is the difference between the period registration updating timer duration configured for the terminal equipment and the period RAN notification area updating monitoring timer duration.

17. The communications apparatus of claim 16, wherein the periodic RAN notification area update monitoring timer duration is carried in a radio resource control, RRC, connection release message.

18. A communications apparatus, comprising:

the processing unit is used for updating the duration of the monitoring timer according to the periodic RAN notification area and setting an initial value of a periodic registration updating timer;

the initial value is the time length of the periodic RAN notification area updating monitoring timer, or the difference value between the time length of the periodic registration updating timer configured for the terminal equipment and the time length of the periodic RAN notification area updating monitoring timer.

19. The communications apparatus of claim 18, wherein the periodic RAN notification area update monitoring timer duration is carried in a radio resource control, RRC, connection release message.

20. A communications apparatus, comprising:

a transceiver unit, configured to receive timer reference information from a radio access network RAN node, where the timer reference information is a period RAN notification area update timer duration, or a difference between the period RAN notification area update monitoring timer duration and the period RAN notification area update timer duration;

the processing unit is used for obtaining the time length of a target mobile reachable timer according to the timer reference information, and the time length of the target mobile reachable timer is used for setting the mobile reachable timer;

wherein,

the processing unit is further to: and acquiring the time length of the target mobile reachable timer according to the timer reference information and the time length of the normal mobile reachable timer.

21. The communications apparatus of claim 20, wherein the target mobile reachable timer duration is a difference between the normal mobile reachable timer duration and the timer reference information.

22. A communications device according to any of claims 20-21, wherein said timer reference information is carried in an N2 UE context release request message.

23. A communications apparatus, comprising:

a transceiver unit, configured to receive timer reference information from a radio access network RAN node, where the timer reference information is a period RAN notification area update monitoring timer duration, a period RAN notification area update timer duration, or a difference between the period RAN notification area update monitoring timer duration and the period RAN notification area update timer duration;

the processing unit is used for setting an initial value of the mobile reachable timer according to the timer reference information;

24. The communications apparatus of claim 23, wherein the timer reference information is carried in an N2 UE context release request message.

25. A communications apparatus, comprising:

the processing unit is used for acquiring timer reference information, wherein the timer reference information is the time length of a periodic radio access network RAN notification area update timer, or the difference value between the time length of the periodic RAN notification area update monitoring timer and the time length of the periodic RAN notification area update timer;

a transceiver unit, configured to send the timer reference information to an access and mobility management function (AMF) node, where the AMF node is configured to receive the timer reference information from a Radio Access Network (RAN) node, and the timer reference information is a period RAN notification area update monitoring timer duration, a period RAN notification area update timer duration, or a difference between the period RAN notification area update monitoring timer duration and the period RAN notification area update timer duration; setting an initial value of a mobile reachable timer according to the timer reference information; the initial value is the timer reference information, or the difference between the normal movement reachable timer duration and the timer reference information.

26. The communications apparatus of claim 25, wherein the timer reference information is carried in an N2 UE context release request message.

27. The communication device according to claim 25 or 26, wherein the transceiver unit is further configured to:

and sending a periodic RAN notification area update monitoring timer duration to the terminal equipment.

28. The communications apparatus of claim 27, wherein the periodic RAN notification area update monitoring timer duration is carried in a radio resource control, RRC, connection release message.

29. A communications apparatus, comprising:

an obtaining unit, configured to obtain a duration of a periodic radio access network RAN notification area update monitoring timer;

the receiving and sending unit is used for sending the time length of the periodic RAN notification area updating monitoring timer to the terminal equipment;

30. The communications apparatus of claim 29, wherein the periodic RAN notification area update monitoring timer duration is carried in a radio resource control, RRC, connection release message.

31. A communications device comprising a processor coupled to a memory, the memory for storing a program, the processor calling the program stored by the memory to perform the method of any of claims 1 to 15.

32. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, is able to carry out the method of any one of claims 1 to 15.