WO2020156116A1

WO2020156116A1 - Context storage method and apparatus

Info

Publication number: WO2020156116A1
Application number: PCT/CN2020/071712
Authority: WO
Inventors: 陈磊; 李秉肇; 晋英豪; 许斌
Original assignee: 华为技术有限公司
Priority date: 2019-01-28
Filing date: 2020-01-13
Publication date: 2020-08-06
Also published as: CN111491338A; CN111491338B

Abstract

The embodiments of the present application provide a context storage method and apparatus. A first network device, i.e. a network device releasing a terminal device from a connected state to an inactive state, sends access stratum context of the terminal device to a second network device, and the second network device stores the access stratum context of the terminal device. As the access stratum context of the terminal device is not stored on the first network device, but is stored on the second network device, no matter how far the first network device moves, a third network device can obtain the access stratum context of the terminal device from the second network device, and resume the link between the terminal device and the third network device, thus improving the success rate of data transmission, the third network device being a network device providing a service when the terminal device enters into a connected state from an inactive state.

Description

Context storage method and device

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 2019100817119, and the application name is "Context Storage Method and Device" on January 28, 2019, the entire content of which is incorporated into this application by reference.

Technical field

The embodiments of the present application relate to the field of communication technology, and in particular, to a context storage method and device.

Background technique

The 5th generation mobile communication (5G) technology is also called 5G new radio access technology (New RAT), and New RAT is abbreviated as NR. In the NR technology, the radio resource control (Radio Resource Control, RRC) state of a terminal equipment (user equipment, UE) includes a connected state, an inactive state, and an idle state. When the UE is in the connected state, a link is established between the UE and the base station, and there is also a link for the UE between the base station and the core network; when the UE is in the inactive state, there is no link for the UE between the base station and the core network. Disconnected, but the link between the UE and the base station is released, the base station stores the UE's access stratum context, so that when there is data to be transmitted, the base station can restore the link between the base station and the UE; the UE is idle In the state, the link between the UE and the base station and the link between the base station and the core network for the UE are all released.

In traditional cellular networks, when a connected UE enters an inactive state, the base station assigns an inactive-radio network temporary identifier (I-RNTI) to the UE to store the UE’s access layer context, and The link between the base station and the UE is released so that the UE enters an inactive state. The base station in this process is also called an anchor base station. When the core network needs to send downlink data to the UE, the data reaches the anchor base station through the link between the core network and the base station, and the anchor base station sends the UE's radio access network notification area (RAN-based notification area, RNA). Send an RNA paging message to page the UE. Among them, RNA can be understood as a collection of cells, and there are Xn interfaces between base stations corresponding to each cell in the same RNA. After the UE detects the RNA paging message, it sends an RRC resume (resume) message to the current base station, which needs to carry the I-RNTI identifier to the current base station. The current base station de-anchors the base station according to the I-RNTI identifier and obtains the access layer context. The context establishes a link between the UE and the current base station, so that the UE transitions from an inactive state to a connected state, and then the UE receives downlink data. When the UE needs to send uplink data to the core network, the UE sends an RRC resume message carrying I-RNTI to the current base station. The current base station determines the anchor base station according to the I-RNTI, and obtains the connection from the anchor base station through the Xn interface between the base stations. Into the layer context. After that, the current base station establishes a link between the UE and the current base station according to the access stratum context, so that the UE transitions from the inactive state to the connected state.

During the transition process of the UE from the inactive state to the connected state, for uplink data, the current base station needs to obtain the access stratum context from the anchor base station through the Xn interface, and for downlink data, the anchor base station needs to page the UE in RNA. However, traditional cellular networks cannot provide coverage for UEs, for example, places where base stations cannot be deployed in places such as the sea and desert. To this end, a non-terrestrial network (NTN) is introduced, and part of the base station or base station functions are deployed on high-altitude platforms or satellites to provide coverage for UEs. In NTN based on satellite deployment, the beam of a satellite antenna is used to cover the ground to form a cell, and the beam-to-cell mapping method includes a ground stationary cell mapping method. In this way, the geographic location of the cell is fixed relative to the ground, and the moving satellite adjusts its beam to cover the cell. As the satellite moves, at different times, the same cell will be covered by different satellites. Moreover, the Xn interfaces between base stations deployed on different satellites are limited, and it is possible that only adjacent base stations can have Xn interfaces. In the NTN based on satellite deployment, when the UE in the connected state enters the inactive state, the anchor base station allocates I-RNTI to the UE, stores the UE's access stratum context, and sends the RRC release message carrying the I-RNTI to the UE . Afterwards, during the uplink data transmission process, the UE sends an RRC resume message to the current base station, so that the current base station obtains the access stratum context from the anchor base station. However, as the anchor base station moves continuously with the satellite, it moves to a position where it may not be able to maintain the Xn interface with the current base station, so that the current base station cannot obtain the access layer context, and thus the UE cannot switch from the inactive state to the connected state. Cause the uplink data transmission to fail. During the downlink data transmission process, the anchor base station sends a paging message to the base station in the RNA area to page the UE, thereby restoring the link between the UE and the network device. Because the anchor base station moves continuously with the satellite, the distance between the anchor base station and the base station in the RNA area is very long, and the base station in the RNA area cannot receive the paging message, and the anchor base station cannot be paged. UE, causing downlink data transmission to fail. Therefore, how to store the access layer context of the terminal device so that the network device that provides services for the terminal device to recover from the inactive state to the connected state can obtain the access layer context of the terminal device to improve the success rate of data transmission. Urgent problems to be solved.

Summary of the invention

The embodiments of the application provide a context storage method and device. By storing the access layer context of the terminal device in the core network device, the network device that provides services for the terminal device to recover from the inactive state to the connected state can obtain the terminal device The access layer context can improve the success rate of data transmission.

In the first aspect, the embodiments of the present application provide a context storage method, which can be applied to a first network device or a chip in the first network device. The method is applied to the first network device as an example below. To describe, the method includes: the first network device sends the access layer context of the terminal device and the identification of the terminal device to the second network device, so that the second network device stores the access layer of the terminal device The context and the identification of the terminal device, the first network device is a network device that releases the terminal device from a connected state to an inactive state. With this solution, since the access layer context of the terminal device is not stored on the first network device, but on the second network device, no matter how far the first network device moves, the third network device can Obtain the access layer context of the terminal device from the second network device, and restore the link between the terminal device and the third network device, thereby providing a data transmission success rate. The third network device is the terminal device from the inactive state. Enter the network device that provides services in the connected state.

In a feasible design, the above method further includes: the first network device sends access layer security information to the second network device, where the access layer security information includes the first key. Adopt this kind of scheme, guarantee the communication security.

In a feasible design, the above method further includes: the first network device sends a second request message to the second network device to request to release the connection between the second network device and the first network device. For the logical interface of the terminal device; or, the first network device receives the second request message sent by the second network device, and releases the second network device and the second network device according to the second request message. A logical interface between the first network devices for the terminal device. With this solution, the purpose of releasing the logical interface for the terminal device is realized.

In a feasible design, the above method further includes: the first network device sends a fourth request message to the second network device, and the fourth request message is used to request that the first network device is directed to the terminal device. The logical interface is switched to a second logical interface, the first logical interface is a logical interface between the first network device and the second network device for the terminal device, and the second logical interface is a fourth network The logical interface between the device and the second network device for the terminal device, and the fourth network device is the communication between the terminal device and the second network device before the terminal device changes from the inactive state to the connected state. The terminal device establishes a network device with a logical interface; the first network device receives a response message sent by the second network device. With this solution, the purpose of establishing a logical interface between the current network device and the core network device for the terminal device when the access layer context of the terminal device is stored on the core network device is realized.

In a feasible design, the above method further includes: the first network device sends a sixth request message to the core network device, where the sixth request message is used to request that the third logical interface of the terminal device be switched Is the fourth logical interface, the third logical interface is the logical interface between the first network device and the core network device for the terminal device, and the fourth logical interface is the second network device and A logical interface between the core network devices for the terminal device; the first network device receives a response message sent by the core network device. With this solution, the purpose of dynamically switching the logical interface between the access network network device and the core network device for the terminal device is realized.

In a feasible design, the aforementioned first network device and the second network device are access network network devices. With this solution, the purpose of dynamically storing the access layer context of the terminal device on the access network network device is realized.

In a feasible design, the aforementioned first network device is an access network device, and the second network device is a core network device. With this solution, the purpose of storing the access layer context of the terminal device in the core network device is realized.

In the second aspect, the embodiments of the present application provide a context storage method, which can be applied to a second network device, and can also be applied to a chip in the second network device. The method is applied to the second network device as an example below. Described, the method includes: the second network device receives the access layer context of the terminal device and the identification of the terminal device sent by the first network device, and the first network device releases the terminal device from the connected state to the non-connected state. The network device in the activated state; the second network device stores the access layer context of the terminal device and the identifier of the terminal device. Since the access layer context of the terminal device is not stored on the first network device, but on the second network device, no matter how far the first network device is moving, the third network device can still move from the second network device. Obtain the access layer context of the terminal device, and restore the link between the terminal device and the third network device, thereby providing a data transmission success rate. The third network device provides services for the terminal device to enter the connected state from the inactive state Network equipment.

In a feasible design, the above method further includes: the second network device receives the access layer security information sent by the first network device, and the access layer security information includes the first key. With this scheme, the security of communication is guaranteed.

In a feasible design, the above method further includes: the second network device receives a first request message that carries the identifier of the terminal device sent by the third network device, and the first request message is used to request the The access layer context of the terminal device, the third network device is a network device that provides services for the terminal device to recover from the inactive state to the connected state; the second network device sends the first network device to the third network device A response message, where the first response message carries the access stratum context of the terminal device and a second key, and the second key is a key generated by the second network device according to the first key. With this solution, the purpose of obtaining the access layer context of the terminal device by the third network device is achieved.

In a feasible design, the aforementioned first request message also carries a first integrity message authentication code MAC-I, and before the second network device sends the first response message to the third network device, it further includes : The second network device determines a second MAC-I; the second network device determines that the first MAC-I is the same as the second MAC-I. Adopt this kind of scheme, has guaranteed the communication security.

In a feasible design, the above method further includes: the second network device receives a second request message sent by the first network device, and according to the second request message, releases the second network device and The logical interface between the first network device for the terminal device; or; the second network device sends a second request message to the first network device to request the release of the second network device and the A logical interface between the first network devices for the terminal device. With this solution, the purpose of releasing the logical interface between the second network device and the first network device for the terminal device is achieved.

In a feasible design, the above-mentioned method further includes: the second network device sends a third request message to the third network device to request communication between the second network device and the third network device Establish a logical interface for the terminal device; or, the second network device receives a third request message sent by the third network device, and communicates between the second network device and the third network device according to the third request message. A logical interface is established between the network devices for the terminal device. With this solution, the purpose of establishing a logical interface between the current network device and the core network device for the terminal device when the access layer context of the terminal device is stored on the core network device is realized.

In a feasible design, the above method further includes: the second network device receives a fourth request message sent by the first network device, and the fourth request message is used to request that the first network device is targeted for the terminal device. A logical interface is switched to a second logical interface, the second network device sends a response message to the first network device, the second network device sends the fifth request message to the fourth network device, the fifth The request message is used to request the establishment of the second logical interface for the terminal device between the fourth network device and the second network device, and the first logical interface is the connection between the first network device and the The logical interface between the second network device for the terminal device, the second logical interface is the logical interface between the fourth network device and the second network device for the terminal device, the fourth A network device is a network device that establishes a logical interface with the second network device for the terminal device before the terminal device changes from the inactive state to the connected state; or; the second network device receives the fourth network device According to the fifth request message, the second logical interface is established between the fourth network device and the second network device for the terminal device, and the second network device Sending a response message to the fourth network device. With this solution, the purpose of dynamically switching the logical interface between the access network network device and the core network device for the terminal device is realized.

In a feasible design, the above-mentioned method further includes: the second network device receives a sixth request message sent by the fourth network device, and the sixth request message is used to request that the second network device is directed to the terminal device. The second logical interface is switched to the fifth logical interface, the second network device sends a response message to the fourth network device, the second network device sends a seventh request message to the third network device, the seventh request message For requesting the establishment of the fifth logical interface for the terminal device between the third network device and the second network device, the second logical interface being the fourth network device and the first The logical interface between the two network devices for the terminal device, the third network device is a network device that provides services for the terminal device to recover from the inactive state to the connected state; or, the second network device receives According to the seventh request message sent by the third network device, a fifth logical interface is established between the third network device and the second network device for the terminal device according to the seventh request message, and the 3. The network device sends a response message. With this solution, the purpose of dynamically switching the logical interface between the access network network device and the core network device for the terminal device and dynamically switching the network device storing the access layer context of the terminal device is realized.

In a feasible design, the above-mentioned method further includes: the second network device sends a fifth request message to the core network device, and the fifth request message is used to request that the second network device and the A fourth logical interface is established between core network devices for the terminal device, and the second network device receives a response message sent by the core network device. With this scheme, the purpose of dynamically switching the logical interface for the terminal device is realized.

In a feasible design, the above method further includes: the second network device sends the access layer context of the terminal device and the identifier of the terminal device to the fifth network device, and the fifth network device is Before the terminal device changes from the inactive state to the connected state, a network device that stores the access layer context and establishes a logical interface with the second network device for the terminal device. With this solution, the purpose of dynamically switching the access network network device that stores the access layer context of the terminal device is realized.

In a feasible design, the above method further includes: the second network device sends a sixth request message to the core network device, where the sixth request message is used to request that the fourth logic for the terminal device The interface is switched to the fifth logical interface, the second network device receives the response message sent by the core network device, and the fourth logical interface is the communication between the second network device and the core network device for the terminal The logical interface of the device, the fifth logical interface is a logical interface between a third network device and the second network device for the terminal device, and the third network device is a logical interface for the terminal device from an inactive state Restore the network equipment that provides services in the connected state. With this solution, the purpose of restoring the logical interface between the access network network device and the core network device for the terminal device when the terminal device changes from the inactive state to the connected state is realized.

In a feasible design, the above method includes: the second network device sends an eighth request message carrying the identifier of the terminal device to the network device in the area where the terminal device is located, so as to request the location where the terminal device is located. The network equipment in the area pages the terminal equipment. With this scheme, the purpose of paging terminal equipment is realized to ensure data transmission.

In a feasible design, the first network device is an access network device, and the second network device is a core network device. With this solution, the goal of storing the access layer context of the terminal device in the core network device is realized.

In a feasible design, the first network device is an access network network device, and the second network device is an access network network device. With this solution, the purpose of storing the access layer context of the terminal device in the access network device is realized.

In the third aspect, the embodiments of the present application provide a context storage method, which can be applied to a third network device, and can also be applied to a chip in a third network device. The method is applied to a third network device as an example below. Described, the method includes: a third network device receives a ninth request message carrying an identifier of the terminal device sent by a terminal device in an inactive state, and the ninth request message is used to request the recovery of the wireless resource of the terminal device Control the RRC connection; the third network device sends a first request message carrying the identifier of the terminal device to a second network device, the second network device is a network device that stores the access layer context of the terminal device; The third network device receives a first response message sent by the second network device, where the first response message carries the access stratum context of the terminal device. With this solution, the access layer context of the terminal device is stored on the second network device, and the network device that provides services for the terminal device to enter the connected state from the active state, that is, after the third network device receives the RRC resume message sent by the terminal device , Obtain the access layer context of the terminal device from the second network device, and establish a link between the terminal device and the third network device, thereby improving the data transmission success rate.

In a feasible design, the above-mentioned method further includes: the third network device receives a third request message sent by the second network device, and according to the third request message in the second network device and the The third network device establishes a logical interface for the terminal device; or, the third network device sends a third request message to the second network device to request communication between the second network device and the first network device. Three network devices establish a logical interface for the terminal device. With this solution, the purpose of obtaining the access layer context of the terminal device by the third network device is achieved.

In a feasible design, the above method further includes: the third network device receives a seventh request message sent by the second network device, and according to the seventh request message, the third network device communicates with the A fifth logical interface is established between the second network devices for the terminal device, and the third network device is a network device that provides services for the terminal device to recover from an inactive state to a connected state; or, the third The network device sends a seventh request message to the second network device, where the seventh request message is used to request the establishment of a fifth logical interface between the third network device and the second network device for the terminal device . With this solution, when the terminal device enters the connected state from the inactive state, the purpose of establishing a logical interface for the terminal device between the second network device and the third network device is realized.

In a feasible design, the above method further includes: the third network device receives a seventh request message sent by the core network device, and according to the seventh request message, the third network device and the second network device A fifth logical interface is established between network devices for the terminal device, and the third network device is a network device that provides services for the terminal device to recover from the inactive state to the connected state; or, the third network device sends The core network device sends a seventh request message, where the seventh request message is used to request the establishment of a fifth logical interface between the third network device and the core network device for the terminal device. With this solution, when the access layer context of the terminal device is stored in the access network network device, when the terminal device enters the connected state from the inactive state, the terminal device can be targeted between the second network device and the third network device. The purpose of establishing a logical interface.

In a feasible design, the third network device is an access network device, and the second network device is a core network device. With this solution, the goal of storing the access layer context of the terminal device in the core network device is realized.

In a feasible design, the third network device is an access network network device, and the second network device is an access network network device. With this solution, the purpose of storing the access layer context of the terminal device in the access network device is realized.

In a feasible design, the third network device and the first network device are the same or different network devices, and the first network device is a network device that releases the terminal device from a connected state to an inactive state.

In the fourth aspect, the embodiments of the present application provide a paging method, which can be applied to core network equipment and chips in the core network equipment. The method is described below by taking the core network equipment as an example. The method includes: a core network device allocates a tracking area list to a terminal device, wherein the tracking area list includes a first tracking area identifier, the first tracking area identifier indicates a first cell set, and The first cell is covered by the first network device, or the first cell corresponds to the first tracking area identifier; the core network device receives the associated information sent by the first network device, and the associated information is used to indicate the first The network equipment served by the first cell in a tracking area list is changed from the first network equipment to the second network equipment, or the first cell corresponding to the first tracking area identifier in the first tracking area list is changed to the first Two cells; the core network device updates the tracking area list according to the association information; the core network device pages the terminal device according to the updated tracking area list. Using this method, for the terrestrial stationary cell mapping method, when the network equipment that provides services for the first cell changes, the network equipment sends associated information to the core network equipment, and the associated information is used to indicate the network that provides services for the first cell The device is switched from the first network device to the second network device; for the ground mobile cell mapping method, when the first cell corresponding to the first tracking area identifier is changed to the second cell, the network device sends the association relationship to the core network device, indicating the first The first cell corresponding to a tracking area identifier is changed to the second cell, so that the core network updates the tracking area list according to the association relationship. When the terminal device needs to be paged subsequently, it determines to which paging message should be sent according to the updated tracking area list The network equipment thus realizes the purpose of paging the terminal equipment.

In a feasible implementation manner, the core network device paging the terminal device according to the updated tracking area list includes: the core network device determines the paging area according to the updated tracking area list; The core network device sends a paging message to the network device corresponding to the cell in the paging area to page the terminal device. With this method, the core network device determines which network device should send the paging message to according to the updated tracking area list, so as to achieve the purpose of paging the terminal device.

In the fifth aspect, the embodiments of the present application provide a paging method, which can be applied to a network device, and can also be applied to a chip in a network device. The method is described below by taking the application to a network device as an example. The method includes : The first network device determines the association management, and the association relationship indicates that the network device serving the first cell in the first tracking area list is changed from the first network device to the second network device, or the first tracking area The first cell corresponding to the first tracking area identifier in the list is changed to the second cell; the device on the network sends the associated information to the core network device to enable the core network device to update the tracking area according to the associated information List. Using this method, for the terrestrial stationary cell mapping method, when the network equipment that provides services for the first cell changes, the network equipment sends associated information to the core network equipment, and the associated information is used to indicate the network that provides services for the first cell The device is switched from the first network device to the second network device; for the ground mobile cell mapping method, when the first cell corresponding to the first tracking area identifier is changed to the second cell, the network device sends the association relationship to the core network device, indicating the first The first cell corresponding to a tracking area identifier is changed to the second cell, so that the core network updates the tracking area list according to the association relationship. When the terminal device needs to be paged subsequently, it determines to which paging message should be sent according to the updated tracking area list The network equipment thus realizes the purpose of paging the terminal equipment.

In a sixth aspect, an embodiment of the present application provides a context storage device. The device may be a first network device or a chip in the first network device. The device may include a processing unit, a sending unit, and a receiving unit. When the apparatus is the first network device, the processing unit may be a processor, the sending unit may be a transmitter, and the receiving unit may be a receiver; the first network device may also include a storage unit, and the storage unit may be a memory; The storage unit is used to store instructions, and the processing unit executes the instructions stored in the storage unit to enable the first network device to implement the foregoing first aspect or functions in various possible implementation manners of the first aspect. When the device is a chip in the first network device, the processing unit may be a processor, and the transceiver unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes the instructions stored in the storage unit to make The first network device implements the above-mentioned first aspect or functions in various possible implementation manners of the first aspect, and the storage unit may be a storage unit (for example, a register, a cache, etc.) in the chip, or may be the second A storage unit (for example, read-only memory, random access memory, etc.) located outside the chip in a network device.

In a seventh aspect, an embodiment of the present application provides a context storage device. The device may be a second network device or a chip in the second network device. The device may include a processing unit, a sending unit, and a receiving unit. When the apparatus is a second network device, the processing unit may be a processor, the sending unit may be a transmitter, and the receiving unit may be a receiver; the second network device may also include a storage unit, and the storage unit may be a memory; The storage unit is used to store instructions, and the processing unit executes the instructions stored in the storage unit, so that the second network device implements the foregoing second aspect or functions in various possible implementation manners of the second aspect. When the device is a chip in the second network device, the processing unit may be a processor, the transceiver unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes the instructions stored in the storage unit to make The second network device implements the above-mentioned second aspect or the functions in various possible implementation manners of the second aspect, and the storage unit may be a storage unit (for example, a register, a cache, etc.) in the chip, or may be the first 2. A storage unit (for example, read-only memory, random access memory, etc.) located outside the chip in the network device.

In an eighth aspect, an embodiment of the present application provides a context storage device. The device may be a third network device or a chip in the third network device. The device may include a processing unit, a sending unit, and a receiving unit. When the apparatus is a third network device, the processing unit may be a processor, the sending unit may be a transmitter, and the receiving unit may be a receiver; the third network device may also include a storage unit, and the storage unit may be a memory; The storage unit is used for storing instructions, and the processing unit executes the instructions stored by the storage unit, so that the third network device implements the foregoing third aspect or functions in various possible implementation manners of the third aspect. When the device is a chip in a third network device, the processing unit may be a processor, and the transceiving unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes the instructions stored in the storage unit to make The third network device implements the above-mentioned third aspect or functions in various possible implementation manners of the third aspect. The storage unit may be a storage unit (for example, a register, a cache, etc.) in the chip, or may be the first Three storage units (for example, read-only memory, random access memory, etc.) located outside the chip in the network device.

In a ninth aspect, an embodiment of the present application provides a paging device, which may be a core network device or a chip in the core network device. The device may include a processing unit, a sending unit, and a receiving unit. When the device is a core network device, the processing unit may be a processor, the sending unit may be a transmitter, and the receiving unit may be a receiver; the core network device may also include a storage unit, and the storage unit may be a memory; the storage The unit is used to store instructions, and the processing unit executes the instructions stored in the storage unit to enable the core network device to implement the foregoing fourth aspect or functions in various possible implementation manners of the fourth aspect. When the device is a chip in a core network device, the processing unit may be a processor, and the transceiving unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes the instructions stored in the storage unit to make the The core network device implements the functions of the foregoing fourth aspect or various possible implementation manners of the fourth aspect, and the storage unit may be a storage unit (for example, a register, a cache, etc.) in the chip, or the core network device A storage unit (for example, read-only memory, random access memory, etc.) located outside the chip.

In a tenth aspect, an embodiment of the present application provides a paging device, which may be a network device or a chip in the network device. The device may include a processing unit, a sending unit, and a receiving unit. When the device is a network device, the processing unit may be a processor, the sending unit may be a transmitter, and the receiving unit may be a receiver; the network device may also include a storage unit, and the storage unit may be a memory; In order to store instructions, the processing unit executes the instructions stored in the storage unit to enable the network device to implement the above-mentioned fifth aspect or functions in various possible implementation manners of the fifth aspect. When the device is a chip in a network device, the processing unit may be a processor, and the transceiver unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes instructions stored in the storage unit to enable the network The device implements the functions of the fifth aspect or various possible implementation manners of the fifth aspect. The storage unit may be a storage unit (for example, a register, a cache, etc.) in the chip, or a storage unit located in the network device. A storage unit external to the chip (for example, read-only memory, random access memory, etc.).

In an eleventh aspect, an embodiment of the present application provides a computer program product containing instructions that, when it runs on a first network device, enables the first network device to execute the foregoing first aspect or various possible implementations of the first aspect The method in the way.

In the twelfth aspect, the embodiments of the present application provide a computer program product containing instructions that, when it runs on a second network device, enables the second network device to execute the aforementioned second aspect or various possible aspects of the second aspect. The method in the implementation mode.

In a thirteenth aspect, the embodiments of the present application provide a computer program product containing instructions, which when run on a third network device, enable the third network device to execute the foregoing third aspect or various possible implementations of the third aspect The method in the way.

In a fourteenth aspect, the embodiments of the present application provide a computer program product containing instructions that, when run on a core network device, enable the core network device to execute the foregoing fourth aspect or various possible implementation manners of the fourth aspect Methods.

In a fifteenth aspect, the embodiments of the present application provide a computer program product containing instructions that, when run on a network device, enable the network device to execute the method in the fifth aspect or various possible implementations of the fifth aspect. .

In a sixteenth aspect, embodiments of the present application provide a computer-readable storage medium that stores instructions in the computer-readable storage medium, and when it runs on a first network device, the first network device executes the first aspect described above. Or methods in various possible implementations of the first aspect.

In a seventeenth aspect, an embodiment of the present application provides a computer-readable storage medium having instructions stored in the computer-readable storage medium, which when run on a second network device, cause the second network device to execute the above-mentioned second aspect Or methods in various possible implementations of the second aspect.

In an eighteenth aspect, an embodiment of the present application provides a computer-readable storage medium that stores instructions in the computer-readable storage medium, and when it runs on a third network device, the third network device executes the above-mentioned third aspect Or methods in various possible implementations of the third aspect.

In a nineteenth aspect, an embodiment of the present application provides a computer-readable storage medium that stores instructions in the computer-readable storage medium, which when run on a core network device, causes the core network device to execute the fourth aspect or the first Four aspects of various possible implementation methods.

In a twentieth aspect, an embodiment of the present application provides a computer-readable storage medium that stores instructions in the computer-readable storage medium, which when run on a network device, causes the network device to execute the fifth aspect or the fifth aspect above Of the various possible implementations.

In the context storage method and device provided by the embodiments of the present application, the first network device, that is, the network device that releases the terminal device from the connected state to the inactive state, sends the access layer context of the terminal device to the second network device, and the second network device The device stores the access layer context of the terminal device. Since the access layer context of the terminal device is not stored on the first network device, but on the second network device, no matter how far the first network device is moving, the third network device can still move from the second network device. Obtain the access layer context of the terminal device, and restore the link between the terminal device and the third network device, thereby providing a data transmission success rate. The third network device provides services for the terminal device to enter the connected state from the inactive state Network equipment.

Description of the drawings

Fig. 1A is a schematic diagram of a mapping method of a ground stationary cell;

Fig. 1B is a schematic diagram of a mapping mode of a ground mobile cell;

FIG. 2 is a schematic diagram of a scenario applicable to a context storage method provided by an embodiment of the present application;

3 is a schematic diagram of RRC state switching of a terminal device to which a context storage method provided by an embodiment of the present application is applicable;

FIG. 4 is a flowchart of a context storage method provided by an embodiment of the present application;

FIG. 5 is a flowchart of another context storage method provided by an embodiment of the present application;

FIG. 6 is a flowchart of another context storage method provided by an embodiment of the present application;

FIG. 7 is a flowchart of another context storage method provided by an embodiment of the present application;

FIG. 8 is a flowchart of another context storage method provided by an embodiment of the present application;

FIG. 9 is a flowchart of a paging method provided by an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a context storage device provided by an embodiment of this application;

11 is a schematic structural diagram of another context storage device provided by an embodiment of the application;

FIG. 12 is a schematic structural diagram of another context storage device provided by an embodiment of this application;

FIG. 13 is a schematic structural diagram of a paging device provided by an embodiment of this application;

FIG. 14 is a schematic structural diagram of another paging device provided by an embodiment of this application;

15 is a schematic structural diagram of another context storage device provided by an embodiment of the application;

FIG. 16 is a schematic structural diagram of another paging device provided by an embodiment of this application.

detailed description

Non-terrestrial networks are introduced into 5G systems, which provide seamless coverage for UEs by deploying base stations or part of base station functions on high-altitude platforms or satellites, and high-altitude platforms or satellites are less affected by natural disasters, which can improve the reliability of 5G systems . In NTN based on satellite deployment, satellites adjust antennas to form different beams to cover the ground. The beam and cell mapping methods include ground stationary cell mapping methods. Fig. 1A is a schematic diagram of a mapping method of a ground stationary cell. Please refer to Figure 1A. The thick black solid arrow in the figure shows the direction of satellite movement. In this mapping mode, the geographic location of the cell is fixed relative to the ground. The moving satellite adjusts its beam to cover the cell. Movement, at different moments, the same cell will be covered by different satellites. For example, at time T1, cell 1 and cell 2 are covered by the beam of gNB1, and cell 3 and cell 4 are covered by the beam of gNB2, as shown by the thin solid line; at time T2, although both gNB1 and gNB2 move to the left, they still You can adjust your own beam to ensure coverage of cells 1, 2, 3, and 4, as shown by the thin dashed line in the figure. Time T3: Compared to time T1, gNB1 and gNB2 have moved a sufficient distance, gNB1 cannot provide coverage for cell 2 by adjusting the beam, and gNB2 cannot provide coverage for cell 4 by adjusting the beam. At this time, gNB2 can provide coverage for cell 2, and gNB3 can provide coverage for cell 4, as shown by the thick black solid line in the figure.

In the NTN based on satellite deployment, when the UE in the connected state enters the inactive state, the anchor base station allocates I-RNTI to the UE, stores the UE's access stratum context, and sends the RRC release message carrying the I-RNTI to the UE . Afterwards, during the uplink data transmission process, the UE sends an RRC resume message to the current base station, so that the current base station obtains the access stratum context from the anchor base station. However, due to the continuous movement of the satellite, the anchor base station moves to a position where it cannot maintain the Xn interface with the current base station, which makes the current base station unable to obtain the access layer context, which makes the UE unable to switch from the inactive state to the connected state, resulting in Uplink data transmission failed. During the downlink data transmission process, the anchor base station sends a paging message to the base station in the RNA area to page the UE. Because the anchor base station moves continuously with the satellite, the distance between the anchor base station and the base station in the RNA area is very long, and the base station in the RNA area cannot receive the paging message, and the anchor base station cannot be paged. UE, causing downlink data transmission to fail.

In addition, in non-terrestrial networks, the beam-to-cell mapping method also includes the terrestrial mobile cell mapping method. In this way, the base station does not dynamically adjust its beam direction, and the beam generated by the base station moves on the ground with the movement of the satellite/base station. Exemplarily, please refer to FIG. 1B. FIG. 1B is a schematic diagram of a mapping method of a ground mobile cell. Please refer to Figure 1B. The thick black solid arrow in the figure shows the direction of satellite movement. In this mapping mode, at T1, a certain area on the earth is performed by cells 1, 2 of gNB1 and cells 3, 4 of gNB2. Coverage, as shown by the dotted line in the figure, and at time T3, this area is covered by gNB1 cell 2, gNB2 cell 3, 4 and gNB3 cell 5, as shown by the solid line in the figure. In the above ground mobile cell mapping method, since the cell is always moving, the terminal device frequently performs RAN-based notification area update (RNAU), which wastes the power of the terminal device and the network signaling overhead.

In view of this, the embodiments of the present application provide a context storage method and device, which store the access layer context of the terminal device in the core network device or other network devices other than the aforementioned anchor network device to improve the reliability of data transmission. .

The context storage method provided by the embodiments of this application can be used in the fourth generation (4G) mobile communication system (for example, long term evolution (LTE) system, advanced long term evolution, LTE- A)), 3rd generation partnership project (3rd generation partnership project, 3GPP) related cellular systems, fifth generation (5th generation, 5G) mobile communication systems and subsequent evolutionary communication systems. Among them, 5G can also be referred to as new radio (NR).

The first network device, the second network device, and the third network device involved in the embodiments of the present application may be base stations, such as a macro base station, a micro base station, and a distributed unit-control unit (DU-CU), It is a device that is deployed in a wireless access network and can communicate with terminal devices wirelessly. The base station can be used to convert the received air frame and Internet protocol (IP) packets to each other, and act as a router between the terminal device and the rest of the access network, where the rest of the access network can include the IP network; The base station can also coordinate the attribute management of the air interface. For example, the base station may be an evolved base station (evolutional Node B, eNB or e-NodeB) in LTE, or a gNB in NR. The base station can also be a wireless controller in the cloud radio access network (CRAN) scenario, or it can be a relay station, access point, in-vehicle device, wearable device, or a public land mobile network that will evolve in the future (public land mobile network). The mobile network, PLMN) network equipment, etc., are not limited in the embodiment of the present application.

The second network device involved in the embodiments of this application may also be a core network device. For example, in a 5G communication system, the second network device may be an Access and Mobility Management Function (AMF) device, Session Management Function (SMF) equipment, Policy Control Function (PCF) equipment, Application Function (AF), Network Slice Selection Function (NSSF) equipment, authentication service function (Authentication Server Function, AUSF) equipment and unified data management (Unified Data Management, UDM) equipment, etc.; for another example, in a 4G communication system, the second network equipment may be a mobility management entity (Mobility Management Entity, MME) network element, Serving GPRS Support Node (Serving GPRS Support Node, SGSN) network element, Packet Data Network Gateway (Packet Data Network Gateway), etc. In other communication systems, the core network equipment is similar to AMF equipment or MME equipment.

The terminal device involved in the embodiments of the present application may be a device that provides users with voice and/or data connectivity, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. The terminal device can communicate with one or more core networks via the radio access network (RAN) network device. The terminal device can be a mobile terminal device, such as a mobile phone (or “cellular” phone) and a mobile phone. The computer of the terminal device, for example, may be a portable, pocket-sized, handheld, built-in computer or vehicle-mounted mobile device, which exchanges language and/or data with the wireless access network. For example, the terminal device can be a personal communication service (PCS) phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant ( personal digital assistant, PDA), handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminals in the future 5G network or future evolution of the public land mobile communication network ( The terminal equipment in the public land mobile network (PLMN) is not limited in this embodiment of the present application. Terminal equipment can also be called system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point, Remote terminal equipment (remote terminal), access terminal equipment (access terminal), user terminal equipment (user terminal), user agent (user agent), user equipment (user device), or user equipment (user equipment).

FIG. 2 is a schematic diagram of a scenario to which a context storage method provided by an embodiment of the present application is applicable. Please refer to Figure 2, the network equipment and terminal equipment 1-terminal equipment 6 form a communication system. In the communication system, any terminal equipment of terminal equipment 1-terminal equipment 6 can send uplink data to network equipment 1 or receive network equipment 1. Downlink data sent. In addition, the terminal device 4-6 can also form a communication system. In the communication system, the terminal device 4 or the terminal device 6 can send uplink data to the terminal device 5 or receive downlink data sent by the terminal device 5. The network device 2 and the terminal device 7-9 can also form a communication system, and the terminal device 7-9 can send uplink data to the network device 2 or receive downlink data sent by the network device 2. The network device 1 is connected to the core network device, and the network device 2 is connected to the core network device through a satellite observation station or the like.

The terminal device described in the embodiment of the present application may be any one of UE1 to UE9, and the first network device may be a network device that provides services for UE1 to UE6, or a network device that provides services for UE7 to UE9, The second network device may be a core network device, or the second network device and the first network device are different access network network devices, and the third network device may be a network device that provides services for non-connected terminal devices, The third network device and the first network device may be different network devices, and the third network device and the second network device may be the same access network network device.

Fig. 3 is a schematic diagram of RRC state switching of a terminal device to which a context storage method provided by an embodiment of the present application is applicable. As shown in FIG. 3, the RRC state of the terminal device includes a connected state (connected), an inactive state (inactive), and an idle state. When the UE is in the connected state, a link is established between the UE and the network device, and there is also a link for the UE between the network device and the core network; when the UE is in the inactive state, the link between the network device and the core network is for the UE The link is not disconnected, but the link between the UE and the network device is released, and the network device stores the access layer context of the UE so that when there is data to be transmitted, the network device can restore the connection between the network device and the UE When the UE is in an idle state, the link between the UE and the network device, and the link between the network device and the core network for the UE are released.

Hereinafter, based on the explanations of FIG. 2 and FIG. 3, the context storage method described in the embodiment of the present application will be described in detail. For example, see Figure 4.

Fig. 4 is a flowchart of a context storage method provided by an embodiment of the present application. This embodiment is from the perspective of interaction between the first network device, the second network device, and the third network device, and the context storage method described in the embodiment of the present application is described in detail. This embodiment includes:

101. The first network device sends the access layer context of the terminal device and the identifier of the terminal device to the second network device.

Correspondingly, the second network device receives the access layer context of the terminal device and the identifier of the terminal device sent by the first network device.

Wherein, the first network device is a network device that releases the terminal device from a connected state to an inactive state. The first network device allocates an identifier, such as I-RNTI, to the terminal device, and stores the access layer context of the terminal device with this identifier. The first network device is also referred to as an anchor network device of the terminal device.

In this step, in order to make the terminal device enter the inactive state from the connected state, the first network device sends an RRC release (release) message to the terminal device in the connected state, and sends the access layer context and the access layer context of the terminal device to the second network device. The identification of this terminal device. After receiving the RRC release message, the terminal device enters the inactive state from the connected state. The second network device may be an access network device or a core network device, which is not limited in the embodiment of the present application. The identifier of the terminal device may be the inactive-radio network temporary identifier (RNTI) assigned by the first network device to the terminal device, and the international mobile subscriber identification number (IMSI) of the terminal device Wait.

102. The second network device stores the access stratum context of the terminal device and the identifier of the terminal device.

In this step, the second network device stores the received access layer context of the terminal device, the identification of the terminal device, and the corresponding relationship between the access layer context and the identification of the terminal device.

In the context storage method provided by the embodiments of the present application, the first network device, that is, the network device that releases the terminal device from the connected state to the inactive state, sends the access layer context of the terminal device to the second network device, and the second network device stores The access layer context of this terminal device. Since the access layer context of the terminal device is not stored on the first network device, but on the second network device, no matter how far the first network device is moving, the third network device can still move from the second network device. Obtain the access layer context of the terminal device, and restore the link between the terminal device and the third network device, thereby providing a data transmission success rate. The third network device provides services for the terminal device to enter the connected state from the inactive state Network equipment.

Fig. 5 is a flowchart of another context storage method provided by an embodiment of the present application. In this embodiment, after the access layer context of the terminal device is stored in the second network device, how does the third network device, that is, the network device that provides services for the terminal device to enter the connected state from the active state, obtain the access layer context of the terminal device From the perspective of, the context storage method described in the embodiment of the present application will be described in detail. This embodiment includes:

201. A third network device receives a ninth request message that carries an identifier of the terminal device sent by a terminal device in an inactive state.

Wherein, the ninth request message is used to request to restore the link between the terminal device and the network device.

In this step, when the terminal device needs to send uplink data or receive downlink data, it sends an RRC resume (resume) message to the current base station, that is, the third network device. The RRC resume message is also called the ninth request message, so that the terminal A link is established between the device and the third network device.

202. The third network device sends a first request message carrying the identifier of the terminal device to the second network device.

Wherein, the second network device is a network device that stores the access layer context of the terminal device;

In this step, the third network device sends a first request message to the second network device that stores the access layer context of the terminal device, and correspondingly, the second terminal device receives the first request message, and according to the identification of the terminal device, Determine the access layer context of the terminal device.

203. The third network device receives the first response message sent by the second network device.

Wherein, the first response message carries the access stratum context of the terminal device.

In this step, the second network device sends a first response message to the third network device, and correspondingly, the third network device receives the first response message.

In the context storage method provided by the embodiments of this application, the access layer context of the terminal device is stored on the second network device, and the network device that provides services for the terminal device to enter the connected state from the active state, that is, the third network device receives the terminal device's transmission After the RRC resume message, obtain the access layer context of the terminal device from the second network device, and establish a link between the terminal device and the third network device, thereby improving the success rate of data transmission.

Hereinafter, the context storage method described in the embodiment of the present application will be described in detail. Exemplary, please refer to Fig. 6-8.

Fig. 6 is a flowchart of another context storage method provided by an embodiment of the present application. In this embodiment, the context of the access layer of the terminal device is stored in the core network device, that is, the second network device is the core network device, and the logical interface between the core network device and the first network device for the terminal device is released until When the terminal device enters the connected state from the inactive state, a logical interface for the terminal device is established between the third network device and the core network device. In this implementation, the first network device may also be referred to as an anchor base station, the second network device is, for example, an AMF device, and the third network device is also referred to as a target base station. This embodiment includes:

301. The first network device sends an RRC release message to a terminal device.

In this step, the first network device sends an RRC release message to the terminal device in the connected state. The RRC release message includes the identification of the terminal device, the network color code (NCC) or the RAN-based notification area (RNA information). The identification of the terminal device may be the first network device The I-RNTI assigned to the terminal device, the IMSI of the terminal device, etc. The RNA information can be one or more RNA identifiers, one RNA identifier indicates a cell set, and Xn interfaces exist between the base stations corresponding to the cells in the cell set, There may also be no Xn interface; or RNA information may also be a cell list; or RNA information may also be an indication information used to indicate that the access layer context of the terminal device is stored in the core network device, and the terminal device does not need to be wireless Access network notification area update (RAN-based notification area update, RNAU). Since RNA information indicates an area, which is referred to as the target area below, the network devices in the target area are not limited to the network devices that have Xn interfaces with each other. When the embodiment of the present application is applied to a non-terrestrial network, if a ground mobile cell mapping method is adopted, since the area indicated by the RNA information is large, the terminal device does not need to perform RNAU frequently, which saves power and reduces signaling overhead.

After receiving the RRC release message, the connected terminal device first verifies whether the integrity of the RRC release message is correct by checking the integrity message authentication code (message authentication code for integrity, MAC-I). If the verification is passed, the terminal device will store the access layer context and NCC of the terminal device, delete the access layer keys K_RRCenc, K_Upenc, and K_UPint, and retain K_RRCint. If the NCC stored in the terminal device has nothing to do with the current K_gNB, the current K_gNB is deleted, and if they are consistent, the current K_gNB is retained.

302. The first network device processes the access layer security information of the terminal device.

In the embodiment of this application, the access layer security information includes access layer keys K_RRCenc, K_Upenc, K_UPint, K_RRCint, and so on. In this step, the first network device deletes the access layer keys K_RRCenc, K_Upenc, and K_UPint of the terminal device, and retains K_RRCint.

303. The first network device sends the access layer security information, the access layer context of the terminal device, the identification of the terminal device, and RNA information to the second network device.

Correspondingly, the second network device stores the access layer context of the terminal device, the identification of the terminal device, RNA information, etc.

If the NCC in step 301 above is a new NCC, that is, the NCC has nothing to do with the current key K_gNB, and belongs to an unused {NCC, NH} pair, the first network device will access the layer security information, The identification of the terminal device and the access layer context of the terminal device are sent to the second network device, and the key K_gNB is deleted. Among them, NH (next hop) is the next one, and the access layer security information includes {NCC, NH} pairs, K_RRCint, etc. Among them, the NH corresponding to NCC can be used to derive K_gNB. Correspondingly, the second network device stores the access layer security information.

If the NCC in step 301 is associated with the current key K_gNB, the first network device sends the access layer security information, the identification of the terminal device, and the access layer context of the terminal device to the second network device. Among them, the access layer security information includes {NCC, NH} pair, K_RRCint, etc. Among them, the access layer security information includes keys K_gNB, NCC, K_RRCint, etc., and K_gNB is also called the first key. Accordingly, the second network device stores the access layer security information.

304. The first network device or the second network device initiates a release operation to release a logical interface between the first network device and the second network device for the terminal device.

For example, the second network device receives the second request message sent by the first network device, and releases the communication between the second network device and the first network device according to the second request message. The logical interface of the terminal device. For another example, the second network device sends a second request message to the first network device to request the release of the logical interface between the second network device and the first network device for the terminal device.

305. The second network device initiates an RNA paging message in the area indicated by the RNA information.

In this step, when the terminal device is required to receive the downlink data, the second network device determines the target area based on the RNA information. The target area is the area where the terminal device is located, and the second network device sends the identification of the terminal device to the network device in the target area The eighth request message to request the network device in the target area to page the terminal device. The identifier of the terminal device is, for example, the I-RNTI allocated to the terminal device when the first network device sends the RRC Release message to the terminal device in step 301.

It should be noted that the above step 305 is an optional step.

306. The terminal device sends an RRC Resume message to the third network device.

In this step, when the inactive terminal device needs to send uplink data, or, if the above step 305 is performed, that is, when the terminal device needs to respond to RNA paging, the inactive terminal device sends the data to the third network device. The ninth request message for the identification of the terminal device, that is, the RRC resume message, is used to request the restoration of the radio resource control RRC connection of the terminal device. The RRC resume message also carries the first MAC-I. The first MAC-I may be a short (short) MAC-I. The short MAC-I is, for example, a 16-bit authentication message. The terminal device may The cell radio network temporary identifier (C-RNTI) of the cell radio network temporary identifier (C-RNTI) of the source cell of the device, the physical cell identifier (PCI) of the source cell, and the cell identity (ID) of the current cell are used as Input, and use other parameters including K_RRCint as the input of the complete protection algorithm to calculate short MAC-I.

307. The third network device sends the first request message carrying the identifier of the terminal device to the second network device.

In the embodiment of the present application, the second network device is a network device that stores the access layer context of the terminal device. In this step, the third network device sends a first request message carrying the identifier of the terminal device to the second network device. Optionally, the first request message may also carry the first MAC-I.

308. The second network device determines that the first MAC-I is the same as the second MAC-I.

In this step, the second network device determines the access layer context of the terminal device according to the identifier I-RNTI of the terminal device.

Optionally, if the first request message also carries the first MAC-I, the second network device also determines the second MAC-I according to the integrity preservation algorithm in the access layer context of the terminal device. The calculation method is the same. Then, the second network device determines whether the first MAC-I and the second MAC-I are the same. If the first MAC-I and the second MAC-I are the same, the second network device uses the cell ID and the second MAC-I of the third network device. 3. The carrier frequency of the target cell of the network device and the stored K_gNB or NH indicated by the NCC derives the second key, that is, the new K_gNB, and executes step 309. If the first MAC-I and the second MAC-I are not the same, Then the second network device does not perform processing, that is, does not return the access layer context of the terminal device to the third network device.

At the same time, in addition, the UE will also derive a new K_gNB based on the stored information.

309. The second network device sends a first response message to the third network device, where the first response message carries the access stratum context of the terminal device.

Optionally, if the second network device derives the second key in step 308, the first response message also carries the second key and the NCC associated with the second key, that is, the first response message also carries the new key. K_gNB and the NCC associated with the new K_gNB.

310. The second network device and the third network device establish a logical interface for the terminal device for the terminal device.

For example, the second network device sends a third request message to the third network device to request the establishment of a logical interface between the second network device and the third network device for the terminal device;

For another example, the second network device receives a third request message sent by the third network device, and sends a response to the terminal between the second network device and the third network device according to the third request message. The device establishes a logical interface.

311. The third network device sends an RRC resume message to the terminal device.

In this step, the third network device sends an RRC resume message to the terminal device to establish a link between the terminal device and the third network device.

In this embodiment, the access layer context of the terminal device is stored in the second network device, that is, the core network device. The verification of MAC-I and the derivation of the second key are completed by the core network device, and the RNA paging is performed by the core network device. Initiation, and the logical interface between the access network equipment and the core network equipment for the terminal equipment is not consistent. Since any access network equipment can communicate with the core network equipment, it is necessary for the inactive terminal equipment to enter In the connected state, the third network device, that is, the network device that provides services for the terminal device to recover from the inactive state to the connected state, can obtain the access layer context of the terminal device from the core network device, so that the third network device can communicate with the second network device. Establish logical interfaces for terminal devices between network devices, thereby increasing the success rate of data transmission. At the same time, the network devices in the target area indicated by the RNA information may not have Xn interfaces, so that the target area is no longer limited to network devices with Xn interfaces.

FIG. 7 is a flowchart of another context storage method provided by an embodiment of the present application. In this embodiment, the context of the access layer of the terminal device is stored in the core network device, that is, the second network device is the core network device, the first network device may also be called an anchor base station, and the second network device is, for example, an AMF device , The third network device is also called a target base station. The difference between this embodiment and the above-mentioned embodiment in FIG. 6 is that in this embodiment, the logical interface between the access network device and the core network device for the terminal device is not released, but is in a state of constant switching, for example, the terminal The logical interface of the device was originally established between the first network device and the second network device, and then the logical interface of the terminal device was switched to between the fourth network device and the core network device. This embodiment includes:

401. The first network device sends an RRC release message to the terminal device.

For detailed description, please refer to step 301 above, which will not be repeated here.

402. The first network device processes the access layer security information of the terminal device.

For detailed description, please refer to the above step 302, which will not be repeated here.

403. The first network device sends the access layer security information, the access layer context of the terminal device, the identification of the terminal device, and RNA information to the second network device.

For detailed description, please refer to step 303 above, which will not be repeated here.

404. The first network device sends a fourth request message to the second network device.

Wherein, the fourth request message requests to switch the first logical interface for the terminal device to the second logical interface, and the first logical interface is for the communication between the first network device and the second network device. The logical interface of the terminal device, the second logical interface is the logical interface between the fourth network device and the second network device for the terminal device, and the fourth network device is the terminal device from non A network device that establishes a logical interface with the second network device for the terminal device before the activated state is in the connected state.

405. The second network device sends a response message to the first network device.

406. The second network device sends a fifth request message to the fourth network device.

The fifth request message is used to request the establishment of the second logical interface for the terminal device between the fourth network device and the second network device.

The above steps 404 to 406 realize the purpose of switching the first logical interface of the terminal device to the second logical interface.

In the above steps 404 to 406, the first network device actively initiates the logical interface switch. However, the embodiment of the present application is not limited. In other feasible implementation manners, the fourth network device may also actively initiate the logical switch. In this case, The second network device receives the fifth request message sent by the fourth network device, and establishes the terminal device between the fourth network device and the second network device according to the fifth request message. A second logical interface, where the second network device sends a response message to the fourth network device.

Optionally, after the logical interface is switched, the second network device sends the RNA information to the fourth network device.

407. The fourth network device initiates an RNA paging message in the area indicated by the RNA information.

In this step, when a terminal device is required to receive downlink data, or if the RRC release message in step 401 carries RNA information, and the second network device sends the RNA information to the fourth network device in step 406, the RNA information indicates If a target area is reached, the fourth network device determines the target area based on the RNA information. The target area is the area where the terminal device is located. The fourth network device sends an eighth request message carrying the identification of the terminal device to the network device in the target area. To request the network equipment in the target area to page the terminal equipment.

It should be noted that the above step 407 is optional.

408. The terminal device sends an RRC Resume message to the third network device.

For detailed description, please refer to step 306 above, which will not be repeated here.

409. The third network device sends a first request message carrying the identifier of the terminal device to the second network device.

For detailed description, please refer to the above step 307, which will not be repeated here.

410. The second network device determines that the first MAC-I is the same as the second MAC-I.

For detailed description, please refer to step 308 above, which will not be repeated here.

411. The second network device sends a first response message to the third network device, where the first response message carries the access layer context of the terminal device.

For detailed description, please refer to the above step 309, which will not be repeated here.

412. The fourth network device sends a sixth request message to the second network device.

The sixth request message is used to request that the second logical interface for the terminal device be switched to the fifth logical interface, and the second logical interface is the communication between the fourth network device and the second network device. For the logical interface of the terminal device, the fifth logical interface is a logical interface between a third network device and the second network device for the terminal device.

Correspondingly, the second network device receives the fifth request message sent by the fourth network device.

413. The second network device sends a response message to the fourth network device.

414. The second network device sends a seventh request message to the third network device.

Wherein, the seventh request message is used to request the establishment of the fifth logical interface for the terminal device between the third network device and the second network device, and the second logical interface is the The logical interface between the fourth network device and the second network device for the terminal device, and the fifth logical interface is the logical interface between the third network device and the second network device for the terminal device , The third network device is a network device that provides services for the terminal device to recover from an inactive state to a connected state

The above steps 412 to 414 achieve the purpose of switching the second logical interface of the terminal device to the fifth logical interface.

In the above steps 412 to 414, the fourth network device actively initiates the logical interface switch. However, the embodiment of the present application is not limited. In other feasible implementation manners, the third network device may also actively initiate the logical interface switch. In this case, The second network device receives the seventh request message sent by the third network device, and establishes a second network device for the terminal device between the third network device and the second network device according to the seventh request message. Five logical interfaces, sending a response message to the third network device.

It should be noted that before the terminal device enters the connected state from the inactive state, the logical interface between the access network device and the core network device for the terminal device changes dynamically, that is, from the first network device to the core network device, Switch to the fourth network device-the core network device, continue to switch to the fourth'network device... Finally, after the terminal device enters the connected state from the inactive state, the third network device and the core network device The logical interface of the terminal device. Therefore, the fourth network device in steps 404 to 406 and the fourth network device in steps 412 to 414 may be the same or different network devices.

415. The third network device sends an RRC resume message to the terminal device.

For detailed description, please refer to step 311 above, which will not be repeated here.

In this embodiment, the access layer context of the terminal device is stored in the second network device, that is, the core network device. The MAC-I verification and the derivation of the second key are completed by the core network device, and RNA paging has the core network device. Initiated, and the logical interface between the access network device and the core network device for the terminal device is dynamically changed. Since any access network device can communicate with the core network device, the inactive terminal device is required to enter the connection In the state, the third network device, that is, the network device that provides services for the terminal device to recover from the inactive state to the connected state, can obtain the access layer context of the terminal device from the core network device, and connect the fourth network device to the second network The logical interface between the devices for the terminal device is switched between the third network device and the second network device, thereby improving the data transmission success rate. At the same time, the network devices in the target area indicated by the RNA information may not have Xn interfaces, so that the target area is no longer limited to network devices with Xn interfaces.

FIG. 8 is a flowchart of another context storage method provided by an embodiment of the present application. In this embodiment, the context of the access layer of the terminal device is stored in the access network device, that is, the second network device is an access network device, and the context of the access layer of the terminal device is dynamically transferred, for example, the access layer context of the terminal device The access layer context is initially sent by the first network device to the second network device and stored by the second network device. Then, the second network device sends the access layer context of the terminal device to the fifth network device, which is stored by the fifth network device. , The fifth network device sends the access layer context of the terminal to the fifth'network device... In this embodiment, the first network device may also be called an anchor base station, the second network device may be an access network device, and the third network device may also be called a target base station, which is also an access network device. Compared with the prior art, in this embodiment, the access layer context of the terminal device is stored in the access network device, and as the access network device moves, the access layer network storing the access layer context The device is constantly changing to ensure that even if the access layer network device moves, the current network device (that is, the third network device) clock maintains the Xn interface between the access layer network device storing the access layer context of the terminal device, and The access layer network device storing the access layer context of the terminal device and the core network device maintain a logical interface for the terminal device. For example, the logical interface of the terminal device was originally established between the first network device and the core network device, and then the logical interface of the terminal device was switched to between the fifth network device and the core network device... This embodiment includes:

501. The first network device sends an RRC release message to a terminal device.

502. The first network device processes the access layer security information of the terminal device.

503. The first network device sends the access layer security information, the access layer context of the terminal device, the identification of the terminal device, and RNA information to the second network device.

The difference from step 303 above is that the second network device in step 303 is a core network device, and in this step, the second network device is an access network device.

In this step, when certain conditions are met, for example, according to the satellite movement track, the second network device will cover the cell originally served by the first network device, the first network device sends the access layer security information and the terminal device to the second network device The access layer context, terminal device identification, RNA information, and delete these stored contents.

504. The first network device sends a fourth request message to the core network device.

The fourth request message is used to request that the third logical interface for the terminal device be switched to the fourth logical interface, and the fifth request message is used to request that the second network device and the core network device The fourth logical interface is established for the terminal device, and the third logical interface is the logical interface between the first network device and the core network device for the terminal device, and the fourth logical interface is The interface is a logical interface between the second network device and the core network device for the terminal device.

505. The core network device sends a response message to the first network device.

506. The core network device sends a fifth request message to the second network device.

The above steps 504 to 506 realize the purpose of switching the third logical interface of the terminal device to the fourth logical interface.

In the above steps 504 to 506, the first network device actively initiates the logical interface switch. However, the embodiment of this application is not limited. In other feasible implementation manners, the second network device may also actively initiate the logical interface switch. In this case, The second network device sends a fifth request message to the core network device, where the fifth request message is used to request the establishment of a fourth logical interface for the terminal device between the second network device and the core network device , The second network device receives the response message sent by the core network device.

Optionally, after the logical interface is switched, the first network device sends the RNA information to the second network device.

507. The second network device sends the access stratum context of the terminal device and the identifier of the terminal device to the fifth network device.

Wherein, the fifth network device is a network device that stores the access layer context and establishes a logical interface for the terminal device with the second network device before the terminal device changes from the inactive state to the connected state .

It should be noted that as the second network device moves, when certain conditions are met, for example, the cell originally covered by the second network device is covered by the fifth network device, the second network device sends the terminal to the fifth network device The access layer context of the device and the identification of the terminal device are switched to the fourth logical interface for the fourth logical interface of the terminal device; similarly, when certain conditions are met, for example, the cell originally covered by the fifth network device Covered by the fifth network device, the fifth network device sends the access layer context of the terminal device and the identification of the terminal device to the fifth network device, and the fourth logical interface of the terminal device is switched to fourth. Logical interface.

It should be noted that if the moving distance of the second network device does not meet the preset condition, the access layer context of the terminal device continues to be stored in the second network device.

508. The second network device initiates an RNA paging message in the area indicated by the RNA information.

If the above step 507 is not performed, that is, when the terminal device does not need to respond to the RNA paging, the second network device initiates the RNA paging message in the area indicated by the RNA information.

If the above step 507 is performed, that is, when the terminal device needs to respond to the RNA paging, the fifth network device initiates the RNA paging message in the area indicated by the RNA information.

509. The terminal device sends an RRC Resume message to the third network device.

510. The third network device sends a first request message carrying the identifier of the terminal device to the second network device.

It should be noted that if the above step 507 is executed, the third network device sends the first request message carrying the identifier of the terminal device to the fifth network device.

511. The second network device determines that the first MAC-I is the same as the second MAC-I.

The difference from step 308 above is that in this step, the second network device is an access network device, and the second network device in step 308 is a core network device.

512. The second network device sends a first response message to the third network device, where the first response message carries the access layer context of the terminal device.

513. The second network device sends a sixth request message to the core network device.

The sixth request message is used to request to switch the fourth logical interface for the terminal device to the fifth logical interface.

514. The second network device receives the response message sent by the core network device.

515. The core network device sends a seventh request message to the third network device.

The seventh request message is used to request the establishment of a fifth logical interface for the terminal device between the third network device and the second network device, and the fourth logical interface is the second network The logical interface between the device and the core network device for the terminal device, the fifth logical interface is the logical interface between the third network device and the second network device for the terminal device, and the first Third, the network device is a network device that provides services for the terminal device to recover from the inactive state to the connected state.

The above steps 513 to 515 realize the purpose of switching the fourth logical interface of the terminal device to the fifth logical interface.

In the above steps 513 to 515, the second network device initiates the logical interface switch. However, the embodiment of the present application is not limited. In other feasible implementation manners, the third network device may also initiate the logical switch actively. In this case, the first Third, the network device sends a seventh request message to the core network device, where the seventh request message is used to request the establishment of a fifth logical interface between the third network device and the second network device for the terminal device, so The third network device receives the response message sent by the core network device.

It should be noted that if the above step 207 is performed, before the terminal device enters the connected state from the inactive state, the logical interface between the access network device and the core network device for the terminal device changes dynamically, that is, from the first network Between equipment and core network equipment, between the second network equipment and the core network equipment, continue to switch between the fifth network equipment and the core network equipment, continue to switch between the fifth network equipment and the core network equipment... …, finally, after the terminal device enters the connected state from the inactive state, a logical interface for the terminal device between the third network device and the core network device.

516. The third network device sends an RRC resume message to the terminal device.

In this embodiment, the access layer context of the terminal device is stored in the second network device, that is, the access network network device, and the MAC-I verification and the derivation of the second key are stored by the access layer context of the terminal device. The access network equipment is completed, and the logical interface between the access network equipment and the core network equipment for the terminal equipment changes dynamically, and when the terminal equipment in the inactive state is required to enter the connected state, the third network equipment is the terminal equipment The network device that recovers from the inactive state to the connected state and provides services can obtain the access layer context of the terminal device from the access network network device, and switch the logical interface for the terminal device between the second network device and the core network device to Between the third network device and the core network device, thereby increasing the success rate of data transmission.

In addition, in traditional cellular networks, in order to ensure that the terminal device is reachable at any time, a paging mechanism based on the tracking list (TA) is introduced. A TA list contains multiple TA IDs, and each TA ID indicates One cell set, that is, one TA ID corresponds to multiple cell IDs (cell IDs), and network devices corresponding to different cells may be the same or different. For example, the TA list includes TA1, which corresponds to cell 1, cell 2, and cell 3. The network devices corresponding to cell 1, cell 2, and cell 3 may be the same or different. Moreover, the geographic area indicated by a TA ID is relatively fixed. When the terminal device is registering or updating the TA, the core network will send a TA list to the terminal device. If the terminal device moves within the TA list area, the terminal device does not need to update the TA, and when the terminal device’s After the data arrives, the core network will page the terminal device in the TA list area. In order to facilitate the terminal equipment to determine whether it is still in the TA list, the system broadcast of each cell will broadcast the TA label of the current cell. If the terminal equipment finds that the TA label is not in the TA list sent to itself by the core network, the terminal equipment Perform TA update. When the TA list-based paging mechanism is applied to non-terrestrial networks, if the ground stationary cell mapping method is used, the geographic location of the cell is fixed, and the geographic area indicated by the same TA ID is fixed. However, because the network equipment is always moving, at different times, the same A network device corresponds to a different cell, or in other words, different network devices that provide services for the same cell at different times, resulting in the core network device being unable to page the terminal device according to the TA list. If the ground mobile cell mapping method is adopted, since the network equipment is always moving, the geographic location of the cell changes. Although the mapping relationship between the network equipment and the cell is fixed, the corresponding geographic location of the cell changes at different times, which will also cause the core network The device cannot page to the terminal device.

In view of this, the embodiment of the present application also provides a paging method to avoid that in the TA list-based paging mechanism, since the network device is always moving, the core network device cannot determine which network device it needs to go to and therefore cannot page the message. Disadvantages of paging to terminal equipment.

Fig. 9 is a flowchart of a paging method provided by an embodiment of the present application. This embodiment describes in detail the paging method described in the embodiment of the present application from the perspective of interaction between core network equipment and terminal equipment. This embodiment includes:

601. The core network device allocates a tracking area list to the terminal device.

Wherein, the tracking area list includes a first tracking area identifier, the first tracking area identifier indicates a first cell set, and the first cell in the first cell set is covered by a first network device, or the The first cell corresponds to the first tracking area identifier.

In this step, when the terminal device registers with the core network device, the core network device allocates a tracking area list (TA list) to the terminal device, which is recorded as a tracking area list. The tracking area list contains multiple tracking area identifiers. The area identifier is any one of the tracking area identifiers. The tracking area corresponding to each tracking area identifier is used to indicate a cell set. The first cell set is any one of the cell sets, and the first cell is the first cell set. Any cell in a cell set.

For the ground stationary cell mapping method, the geographic location of the first cell is fixed, but the network equipment that provides coverage for the first cell is different at different times. Assume that in the TA list allocated by the core network device to the terminal device at the beginning, the first cell is covered by the first network device. The first tracking area identifier is any one of the multiple tracking area identifiers, and the first tracking area indicates the first cell set.

For the ground mobile cell mapping method, the network equipment serving the first cell is fixed, but the geographic location corresponding to the first cell changes at different times. In order to ensure that the geographical area indicated by the TA ID is fixed, the corresponding relationship between the TA ID and the cell ID needs to be changed. For example, at time T1, the cell indicated by the first tracking area identifier includes the first cell, and at time T2, the geographic location corresponding to the first cell is covered by the second cell, then the second cell included in the first tracking area identifier.

602. The core network device receives the association information sent by the first network device.

Wherein, for the terrestrial stationary cell mapping method, the association information is used to indicate that the first cell is covered by the second network device. For example, the initial TA list includes TA1-cell1-gNB1 in the mapping relationship, and the association relationship is TA1- Cell 1-gNB2, indicating that cell 1 in TA1 is switched from gNB1 to gNB2; for ground mobile cell mapping, the associated information is used to indicate that the first cell included in the first tracking area identifier is changed to the second cell For example, the mapping relationship in the initial TA list includes TA1-cell1-gNB1, and in the association relationship, TA1-cell2-gNB2, cell 1 and cell 2 correspond to the same geographic area, but gNB1 and gNB2 are different network devices.

In the embodiment of the present application, for the ground stationary cell mapping method, if the network device that provides services for the first cell is changed from the first network device to the second network device, the first network device or the second network device sends to the core network device Association information; or, at least one of the cells served by the first network device changes, for example, at time T1, the first network device provides services for cells 1, 2, and 3, and at time T2, the first network device is cell 1 , 2, 4 provide services, the first network device sends associated information to the core network device.

603. The core network device updates the tracking area list according to the association information.

In this step, after receiving the associated information, the core network device uses the associated information to update the tracking area list. Continue to use the example in step 602 above. For the ground stationary cell mapping method, before the update, the tracking area list has the following relationship: TA1-cell1-gNB1; after the update, TA1-cell1-gNB2; for the ground mobile cell mapping In this way, before the update, the mapping relationship in the TA list includes TA1-cell1-gNB1, and after the update, the mapping relationship in the TA list includes TA1-cell2-gNB2.

604. The core network device pages the terminal device according to the updated tracking area list.

When the data of the terminal device arrives at the core network, the core network device determines which network device should send the paging message to according to the updated tracking area list to achieve the purpose of paging the terminal device.

It should be noted that the arrow 604 in the figure points from the core network device to the terminal device, which merely means that the core network device paging the terminal device, but does not mean that the core network device sends paging to the terminal device.

In the embodiment of the present application, for the ground stationary cell mapping method, when the network device that provides services for the first cell changes, the network device sends associated information to the core network device, and the associated information is used to indicate the service provider for the first cell. The network device is switched from the first network device to the second network device; for the ground mobile cell mapping method, when the first cell corresponding to the first tracking area identifier is changed to the second cell, the network device sends an association relationship to the core network device, indicating The first cell corresponding to the first tracking area identifier is changed to the second cell, so that the core network updates the tracking area list according to the association relationship. When the terminal device needs to be paged subsequently, it is determined according to the updated tracking area list that the paging message should be sent to Which network devices to page to achieve the purpose of paging terminal devices.

FIG. 10 is a schematic structural diagram of a context storage device provided by an embodiment of this application. The context storage device involved in this embodiment may be the first network device or a chip applied to the first network device. The context storage device may be used to execute the function of the first network device in the foregoing embodiment. As shown in FIG. 10, the context storage device 100 may include:

The sending unit 11 is configured to send the access layer context of the terminal device and the identification of the terminal device to the second network device, so as to make the second network device store the access layer context of the terminal device and the terminal device An identifier of the device, the first network device is a network device that releases the terminal device from a connected state to an inactive state.

In a feasible design, the sending unit 11 is further configured to send access layer security information to the second network device, where the access layer security information includes the first key.

In a feasible design, the sending unit 11 is further configured to send a second request message to the second network device to request to release the communication between the second network device and the first network device. Logical interface of terminal equipment;

or,

The apparatus 100 further includes: a receiving unit 13 and a processing unit 12, the receiving unit 13 is configured to receive a second request message sent by the second network device, and the processing unit 12 is configured to respond to the second request Message to release the logical interface between the second network device and the first network device for the terminal device.

In a feasible design, the sending unit 11 is further configured to send a fourth request message to the second network device, and the fourth request message is used to request to switch the first logical interface of the terminal device. Is the second logical interface, the first logical interface is the logical interface between the first network device and the second network device for the terminal device, and the second logical interface is the fourth network device and all The logical interface between the second network device and the terminal device, and the fourth network device is between the terminal device and the second network device before the terminal device changes from the inactive state to the connected state. Network equipment for establishing logical interfaces;

The receiving unit 13 is configured to receive a response message sent by the second network device.

In a feasible design, the sending unit 11 is further configured to send a sixth request message to the core network device, and the sixth request message is used to request to switch the third logical interface for the terminal device to the fourth Logical interface, the third logical interface is a logical interface between the first network device and the core network device for the terminal device, and the fourth logical interface is the second network device and the core A logical interface between network devices for the terminal device;

The receiving unit 13 is configured to receive a response message sent by the core network device.

In a feasible design, the first network device and the second network device are access network network devices.

In a feasible design, the first network device is an access network device, and the second network device is a core network device.

The context storage device provided in the embodiments of the present application can execute the actions of the first network device in the above-mentioned embodiments, and its implementation principles and technical effects are similar, and will not be repeated here.

FIG. 11 is a schematic structural diagram of another context storage device provided by an embodiment of the application. The context storage device involved in this embodiment may be the second network device, or may be a chip applied to the second network device. The context storage device may be used to execute the function of the second network device in the foregoing embodiment. As shown in FIG. 11, the context storage device 200 may include:

The receiving unit 21 is configured to receive the access layer context of the terminal device and the identification of the terminal device sent by a first network device, the first network device being a network device that releases the terminal device from a connected state to an inactive state ；

The storage unit 22 is configured to store the access stratum context of the terminal device and the identifier of the terminal device.

In a feasible design, the receiving unit 21 is further configured to receive access layer security information sent by the first network device, where the access layer security information includes a first key.

In a feasible design, the above-mentioned device 200 further includes: a sending unit 23;

The receiving unit 21 is further configured to receive a first request message carrying an identifier of the terminal device sent by a third network device, and the first request message is used to request the access stratum context of the terminal device. The third network device is a network device that provides services for the terminal device to recover from an inactive state to a connected state;

The sending unit 23 is configured to send a first response message to the third network device, where the first response message carries the access layer context of the terminal device and a second key, and the second key is A key generated by the second network device according to the first key.

In a feasible design, the first request message also carries a first integrity message authentication code MAC-I, and the device 200 further includes a processing unit 24;

The processing unit 24 is configured to determine a second MAC-I, and determine the first MAC-I and the second MAC-I before the sending unit 23 sends the first response message to the third network device. I is the same.

In a feasible design, the receiving unit 21 is further configured to receive a second request message sent by the first network device, and the processing unit 24 is configured to release the first request message according to the second request message. 2. A logical interface between the network device and the first network device for the terminal device;

or,

The sending unit 23 is configured to send a second request message to the first network device to request the release of the logical interface between the second network device and the first network device for the terminal device.

In a feasible design, the sending unit 23 is configured to send a third request message to the third network device to request communication between the second network device and the third network device for the terminal The device establishes a logical interface;

or,

The receiving unit 21 is further configured to receive a third request message sent by the third network device, and the processing unit 24 is configured to communicate between the second network device and the third network device according to the third request message. A logical interface is established between the network devices for the terminal device.

In a feasible design, the receiving unit 21 is configured to receive a fourth request message sent by the first network device, and the fourth request message is used to request that the first logical interface for the terminal device be switched to The second logical interface, the sending unit 23 is configured to send a response message to the first network device, and send the fifth request message to the fourth network device, and the fifth request message is used to request the 4. The second logical interface is established between the network device and the second network device for the terminal device, and the first logical interface is the connection between the first network device and the second network device for the The logical interface of the terminal device, the second logical interface is the logical interface between the fourth network device and the second network device for the terminal device, and the fourth network device is the terminal device from non A network device that establishes a logical interface with the second network device for the terminal device before the activated state is in the connected state;

or,

The receiving unit 21 is further configured to receive a fifth request message sent by a fourth network device, and the processing unit 24 is configured to communicate between the fourth network device and the second network device according to the fifth request message. The second logical interface is established between the devices for the terminal device, and the second network device sends a response message to the fourth network device.

In a feasible design, the receiving unit 21 is further configured to receive a sixth request message sent by the fourth network device, and the sixth request message is used to request that the second logical interface of the terminal device Switching to the fifth logical interface, the sending unit 23 is configured to send a response message to the fourth network device, the second network device sends a seventh request message to the third network device, and the seventh request message is used When requesting to establish the fifth logical interface for the terminal device between the third network device and the second network device, the second logical interface is the fourth network device and the second network device. A logical interface between network devices for the terminal device, the third network device is a network device that provides a service for the terminal device to recover from an inactive state to a connected state;

or,

The receiving unit 21 is further configured to receive a seventh request message sent by the third network device, and the processing unit 24 is configured to communicate between the third network device and the second network device according to the seventh request message. A fifth logical interface is established between network devices for the terminal device, and the sending unit 23 is configured to send a response message to the third network device.

In a feasible design, the sending unit 23 is configured to send a fifth request message to a core network device, and the fifth request message is used to request a communication between the second network device and the core network device. The terminal device establishes a fourth logical interface, and the receiving unit 21 is further configured to receive a response message sent by the core network device.

In a feasible design, the sending unit 23 is configured to send the access layer context of the terminal device and the identification of the terminal device to a fifth network device, and the fifth network device is a slave device of the terminal device. Before the inactive state reaches the connected state, a network device that stores the access layer context and establishes a logical interface with the second network device for the terminal device.

In a feasible design, the sending unit 23 is configured to send a sixth request message to the core network device, and the sixth request message is used to request to switch the fourth logical interface for the terminal device to the first Five logical interfaces, the receiving unit 21 is configured to receive a response message sent by the core network device, and the fourth logical interface is the communication between the second network device and the core network device for the terminal device A logical interface, the fifth logical interface is a logical interface between a third network device and the second network device for the terminal device, and the third network device is a logical interface for the terminal device to recover from an inactive state Network equipment that provides services in a connected state;

In a feasible design, the sending unit 23 is configured to send an eighth request message carrying the identifier of the terminal device to the network device in the area where the terminal device is located, so as to request information in the area where the terminal device is located. The network device pages the terminal device;

In a feasible design, the first network device is an access network network device, and the second network device is an access network network device.

The context storage device provided in the embodiment of the present application can execute the actions of the second network device in the foregoing embodiment, and its implementation principles and technical effects are similar, and will not be repeated here.

FIG. 12 is a schematic structural diagram of another context storage device provided by an embodiment of the application. The context storage device involved in this embodiment may be a third network device or a chip applied to the third network device. The context storage device may be used to execute the function of the third network device in the foregoing embodiment. As shown in FIG. 12, the context storage device 300 may include:

The receiving unit 31 is configured to receive a ninth request message carrying an identifier of the terminal device sent by a terminal device in an inactive state, where the ninth request message is used to request to restore the radio resource control RRC connection of the terminal device;

The sending unit 32 is configured to send a first request message carrying an identifier of the terminal device to a second network device, where the second network device is a network device that stores the access layer context of the terminal device;

The receiving unit 31 is further configured to receive a first response message sent by the second network device, where the first response message carries the access layer context of the terminal device.

In a feasible design, the above-mentioned apparatus 300 further includes: a processing unit 33, and the receiving unit 31 is further configured to receive a third request message sent by the second network device, and the processing unit 33 uses Establishing a logical interface for the terminal device between the second network device and the third network device according to the third request message;

or,

The sending unit 32 is further configured to send a third request message to the second network device to request the establishment of a logical interface between the second network device and the third network device for the terminal device.

In a feasible design, the receiving unit 31 is further configured to receive a seventh request message sent by the second network device, and the processing unit 33 is configured to perform the first request message according to the seventh request message. 3. A fifth logical interface is established between the network device and the second network device for the terminal device, and the third network device is a network device that provides services for the terminal device to recover from an inactive state to a connected state;

or,

The sending unit 32 is further configured to send a seventh request message to the second network device, where the seventh request message is used to request communication between the third network device and the second network device for the The terminal device establishes a fifth logical interface.

In a feasible design, the receiving unit 31 is further configured to receive the seventh request message sent by the core network device, and the processing unit 33 is configured to perform the processing on the third network device according to the seventh request message. Establishing a fifth logical interface with the second network device for the terminal device, and the third network device is a network device that provides services for the terminal device to recover from an inactive state to a connected state;

or,

The sending unit 32 is further configured to send a seventh request message to the core network device, where the seventh request message is used to request that the third network device be established between the third network device and the core network device for the terminal device. Five logical interfaces.

In a feasible design, the third network device is an access network device, and the second network device is a core network device.

In a feasible design, the third network device is an access network network device, and the second network device is an access network network device.

The context storage device provided in the embodiment of the present application can execute the actions of the third network device in the foregoing embodiment, and its implementation principles and technical effects are similar, and will not be repeated here.

FIG. 13 is a schematic structural diagram of a paging device provided by an embodiment of this application. The paging device involved in this embodiment may be a core network device or a chip applied to the core network device. The paging device can be used to perform the functions of the core network device in the embodiment of FIG. 9 described above. As shown in FIG. 13, the paging device 400 may include:

The processing unit 41 is configured to allocate a tracking area list to a terminal device, where the tracking area list includes a first tracking area identifier, the first tracking area identifier indicates a first cell set, and the first cell set in the first cell set A cell is covered by a first network device, or the first cell corresponds to a first tracking area identifier;

The receiving unit 42 is configured to receive association information sent by a first network device, where the association information is used to indicate that the network device served by the first cell in the first tracking area list is changed from the first network device to the second network Device, or, the first cell corresponding to the first tracking area identifier in the first tracking area list is changed to the second cell;

The processing unit 41 is further configured to update the tracking area list according to the associated information, and page the terminal device according to the updated tracking area list.

In a feasible implementation manner, the above-mentioned paging device 400 further includes: a sending unit 43,

The processing unit 41 is configured to determine a paging area according to the updated tracking area list;

The sending unit 43 is configured to send a paging message to a network device corresponding to a cell in the paging area to page the terminal device.

The paging device provided in the embodiment of the present application can perform the actions of the core network device in the foregoing embodiment, and its implementation principles and technical effects are similar, and will not be repeated here.

FIG. 14 is a schematic structural diagram of another paging device provided by an embodiment of this application. The paging device involved in this embodiment may be a network device or a chip applied to the network device. The paging device can be used to perform the functions of the network device in the embodiment of FIG. 9 described above. As shown in FIG. 14, the paging device 500 may include:

The processing unit 51 is configured to allocate a tracking area list to the terminal device, wherein the tracking area list includes a first tracking area identifier, the first tracking area identifier indicates a first cell set, and the first cell set in the first cell set A cell is covered by a first network device, or the first cell corresponds to a first tracking area identifier;

The transceiver unit 52 is configured to receive association information sent by a first network device, where the association information is used to indicate that the network device served by the first cell in the first tracking area list is changed from the first network device to the second network The device, or, the first cell corresponding to the first tracking area identifier in the first tracking area list is changed to the second cell, and is also used to update the tracking area list according to the association information, and according to the updated tracking area The terminal device is paged in the list.

The paging device provided in the embodiment of the present application can perform the actions of the network device in the foregoing embodiment, and its implementation principles and technical effects are similar, and will not be repeated here.

It should be noted that it should be understood that the above receiving unit may be a receiver when actually implemented, and the sending unit may be a transmitter when actually implemented. The processing unit can be implemented in the form of software calling through processing elements; it can also be implemented in the form of hardware. For example, the processing unit may be a separate processing element, or it may be integrated in a chip of the above-mentioned device for implementation. In addition, it may also be stored in the memory of the above-mentioned device in the form of program code, and a certain processing element of the above-mentioned device Call and execute the functions of the above processing unit. In addition, all or part of these units can be integrated together or implemented independently. The processing element described here may be an integrated circuit with signal processing capability. In the implementation process, each step of the above method or each of the above units can be completed by hardware integrated logic circuits in the processor element or instructions in the form of software.

For example, the above units may be one or more integrated circuits configured to implement the above methods, for example: one or more application specific integrated circuits (ASIC), or one or more microprocessors (digital signal processor, DSP), or, one or more field programmable gate arrays (FPGA), etc. For another example, when one of the above units is implemented in the form of processing element scheduling program code, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processors that can call program codes. For another example, these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).

FIG. 15 is a schematic structural diagram of another context storage device provided by an embodiment of this application. As shown in FIG. 15, the context storage device 600 may include: a processor 61 (such as a CPU), a memory 62, a receiver 63, and a transmitter 64; the receiver 63 and the transmitter 64 are both coupled to the processor 61, and the processor 61 Control the receiving action of the receiver 63 and the processor 61 controlling the sending action of the transmitter 64; the memory 62 may include high-speed random access memory (random-access memory, RAM), or may also include non-volatile memory (non-volatile memory). memory, NVM), for example, at least one disk memory. The memory 62 may store various instructions for completing various processing functions and implementing the method steps of the present application. Optionally, the context storage device involved in this application may further include: a communication bus 65. The receiver 63 and the transmitter 64 may be integrated in the transceiver of the context storage device, or may be independent transceiver antennas on the context storage device. The communication bus 65 is used to implement communication connections between components.

In the embodiment of the present application, the above-mentioned memory 62 is used to store computer executable program code, and the program code includes instructions; when the processor 61 executes the instructions, the processor 61 of the context storage device executes the first network device in the above method embodiment. The processing action for the receiver 63 to execute the receiving action of the first network device in the foregoing embodiment, and the sender 64 to execute the sending action of the first network device in the foregoing method embodiment. The implementation principles and technical effects are similar. Repeat it again. or,

The above-mentioned memory 62 is used to store computer executable program code, and the program code includes instructions; when the processor 61 executes the instructions, the processor 61 of the context storage device executes the processing actions of the first network device in the above method embodiment, so that the receiver 63 executes the receiving action of the second network device in the foregoing embodiment, and causes the transmitter 64 to execute the sending action of the second network device in the foregoing method embodiment. The implementation principles and technical effects are similar, and will not be repeated here. or,

The above-mentioned memory 62 is used to store computer executable program code, and the program code includes instructions; when the processor 61 executes the instructions, the processor 61 of the context storage device executes the processing actions of the first network device in the above method embodiment, so that the receiver 63 executes the receiving action of the third network device in the foregoing embodiment, and causes the transmitter 64 to execute the sending action of the third network device in the foregoing method embodiment. The implementation principles and technical effects are similar, and will not be repeated here.

FIG. 16 is a schematic structural diagram of another paging device provided by an embodiment of this application. As shown in FIG. 16, the paging device 700 may include: a processor 71 (such as a CPU), a memory 72, a receiver 73, and a transmitter 74; both the receiver 73 and the transmitter 74 are coupled to the processor 71, and the processor 71 The receiving action of the receiver 73 is controlled, and the processor 71 controls the sending action of the transmitter 74; the memory 72 may include high-speed random-access memory (RAM), or may also include non-volatile memory (non-volatile memory). memory, NVM), for example, at least one disk memory. The memory 72 may store various instructions for completing various processing functions and implementing the method steps of the present application. Optionally, the paging device involved in this application may further include: a communication bus 75. The receiver 73 and the transmitter 74 may be integrated in the transceiver of the paging device, or may be independent transceiver antennas on the paging device. The communication bus 75 is used to implement communication connections between components.

In the embodiment of the present application, the above-mentioned memory 72 is used to store computer executable program code, and the program code includes instructions; when the processor 71 executes the instructions, the processor 71 of the paging device executes the operation of the core network device in the above method embodiment. The processing action enables the receiver 73 to perform the receiving action of the core network device in the foregoing embodiment, and the sender 74 to execute the sending action of the core network device in the foregoing method embodiment. The implementation principles and technical effects are similar, and will not be repeated here. or,

The above-mentioned memory 72 is used to store computer executable program code, the program code includes instructions; when the processor 71 executes the instructions, the processor 71 of the paging device executes the processing actions of the network equipment in the above method embodiment, and the receiver 73 executes The receiving action of the network device in the foregoing embodiment causes the transmitter 74 to execute the sending action of the network device in the foregoing method embodiment. The implementation principles and technical effects are similar, and will not be repeated here.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices. Computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, computer instructions may be transmitted from a website, computer, server, or data center through a cable (such as Coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) to transmit to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

The term "plurality" herein refers to two or more. The term "and/or" in this article is only an association relationship describing the associated objects, which means that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, exist alone B these three situations. In addition, the manner described herein "at least one of..." means one of the listed items or any combination thereof, for example, "at least one of A, B, and C" can mean: A alone exists, alone There are B, C alone, A and B, B and C, A and C, and A, B, and C. In addition, the character "/" in this article generally means that the associated objects before and after are in an "or" relationship; in the formula, the character "/" means that the associated objects before and after are in a "division" relationship.

It can be understood that the various numerical numbers involved in the embodiments of the present application are only for easy distinction for description, and are not used to limit the scope of the embodiments of the present application.

It can be understood that, in the embodiments of the present application, the size of the sequence numbers of the foregoing processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not be implemented in this application. The implementation process of the example constitutes any limitation.

Claims

A context storage method, characterized by comprising:

The first network device sends the access layer context of the terminal device and the identification of the terminal device to the second network device to enable the second network device to store the access layer context of the terminal device and the terminal device’s identity Identifies that the first network device is a network device that releases the terminal device from a connected state to an inactive state.
The method of claim 1, wherein the method further comprises:

The first network device sends access layer security information to the second network device, where the access layer security information includes the first key.
The method according to claim 1 or 2, wherein the method further comprises:

Sending, by the first network device, a second request message to the second network device to request the release of the logical interface between the second network device and the first network device for the terminal device;

or,

The first network device receives the second request message sent by the second network device, and according to the second request message, releases the communication between the second network device and the first network device against the terminal device Logical interface.
The method according to claim 1 or 2, wherein the first network device and the second network device are access network network devices.
The method according to any one of claims 1 to 3, wherein the first network device is an access network device, and the second network device is a core network device.
A context storage method, characterized by comprising:

The second network device receives the access layer context of the terminal device and the identification of the terminal device sent by the first network device, where the first network device is a network device that releases the terminal device from a connected state to an inactive state;

The second network device stores the access stratum context of the terminal device and the identifier of the terminal device.
The method according to claim 6, wherein the method further comprises:

The second network device receives the access layer security information sent by the first network device, where the access layer security information includes the first key.
The method according to claim 7, wherein the method further comprises:

The second network device receives a first request message carrying the identification of the terminal device sent by a third network device, and the first request message is used to request the access layer context of the terminal device, and the third network The device is a network device that provides services for the terminal device to recover from an inactive state to a connected state;

The second network device sends a first response message to the third network device, the first response message carrying the access layer context of the terminal device and a second key, and the second key is the A key generated by the second network device according to the first key.
The method according to claim 8, wherein the first request message also carries a first integrity message authentication code MAC-I, and the second network device sends a first response message to the third network device Before, it also included:

The second network device determines the second MAC-I;

The second network device determines that the first MAC-I is the same as the second MAC-I.
The method according to any one of claims 6-9, wherein the method further comprises:

The second network device receives the second request message sent by the first network device, and according to the second request message, releases the communication between the second network device and the first network device against the terminal device Logical interface;

or;

The second network device sends a second request message to the first network device to request the release of the logical interface between the second network device and the first network device for the terminal device.
The method according to any one of claims 6 to 10, wherein the method further comprises:

Sending, by the second network device, a third request message to a third network device to request the establishment of a logical interface between the second network device and the third network device for the terminal device;

or,

The second network device receives a third request message sent by the third network device, and establishes logic for the terminal device between the second network device and the third network device according to the third request message interface.
The method according to any one of claims 6-9, wherein the method further comprises:

The second network device sends a fifth request message to the core network device, where the fifth request message is used to request the establishment of a fourth logical interface for the terminal device between the second network device and the core network device , The second network device receives the response message sent by the core network device.
The method of claim 12, wherein the method further comprises:

The second network device sends the access layer context of the terminal device and the identification of the terminal device to the fifth network device, and the fifth network device stores the terminal device from the inactive state to the connected state before A network device that establishes a logical interface between the access layer context and the second network device for the terminal device.
The method according to any one of claims 6 to 13, wherein the method comprises:

The second network device sends an eighth request message carrying the identifier of the terminal device to the network device in the area where the terminal device is located, so as to request the network device in the area where the terminal device is located to page the terminal device.
The method according to any one of claims 6 to 11, 14, wherein the first network device is an access network device, and the second network device is a core network device.
The method according to any one of claims 6-9 and 12-14, wherein the first network device is an access network network device, and the second network device is an access network network device.
A context storage device, characterized in that the device is set on a first network device, and the device includes:

The sending unit is configured to send the access layer context of the terminal device and the identification of the terminal device to the second network device, so that the second network device stores the access layer context of the terminal device and the terminal device The first network device is a network device that releases the terminal device from a connected state to an inactive state.
The device according to claim 17, wherein:

The sending unit is further configured to send access layer security information to the second network device, where the access layer security information includes the first key.
The device according to claim 17 or 18, wherein:

The sending unit is further configured to send a second request message to the second network device to request the release of the logical interface between the second network device and the first network device for the terminal device;

or,

The device further includes a receiving unit and a processing unit, the receiving unit is configured to receive a second request message sent by the second network device, and the processing unit is configured to release the second request message according to the second request message. A logical interface between the second network device and the first network device for the terminal device.
The apparatus according to claim 17 or 18, wherein the first network device and the second network device are access network network devices.
The apparatus according to any one of claims 17 to 19, wherein the first network device is an access network device, and the second network device is a core network device.
A context storage device, characterized in that the device is set on a second network device, and the device includes:

A receiving unit, configured to receive the access layer context of the terminal device and the identifier of the terminal device sent by a first network device, the first network device being a network device that releases the terminal device from a connected state to an inactive state;

The storage unit is used to store the access stratum context of the terminal device and the identifier of the terminal device.
The device of claim 22, wherein:

The receiving unit is further configured to receive access layer security information sent by the first network device, where the access layer security information includes a first key.
The device according to claim 23, wherein the device further comprises: a sending unit;

The receiving unit is further configured to receive a first request message carrying an identifier of the terminal device sent by a third network device, where the first request message is used to request the access stratum context of the terminal device, and the first request message 3. A network device is a network device that provides services for the terminal device to recover from an inactive state to a connected state;

The sending unit is configured to send a first response message to the third network device, the first response message carrying the access layer context of the terminal device and a second key, and the second key is A key generated by the second network device according to the first key.
The device according to claim 24, wherein the first request message further carries a first integrity message authentication code MAC-I, and the device further comprises: a processing unit;

The processing unit is configured to determine a second MAC-I before the sending unit sends a first response message to the third network device, and determine that the first MAC-I is the same as the second MAC-I .
The device according to any one of claims 22-25, wherein:

The device further includes a processing unit, the receiving unit is further configured to receive a second request message sent by the first network device, and the processing unit is configured to release the second request message according to the second request message. A logical interface between the network device and the first network device for the terminal device;

or,

The apparatus further includes a sending unit, configured to send a second request message to the first network device to request the release of the logical interface between the second network device and the first network device for the terminal device.
The device according to any one of claims 22 to 26, wherein:

The apparatus further includes a sending unit, configured to send a third request message to a third network device to request the establishment of a logical interface between the second network device and the third network device for the terminal device;

or,

The apparatus further includes a processing unit, and the receiving unit is further configured to receive a third request message sent by the third network device, and the processing unit is configured to access the second network device according to the third request message. A logical interface is established between the device and the third network device for the terminal device.
The device according to any one of claims 22-25, wherein:

The apparatus further includes: a sending unit, configured to send a fifth request message to a core network device, where the fifth request message is used to request communication between the second network device and the core network device for the terminal device A fourth logical interface is established, and the receiving unit is further configured to receive a response message sent by the core network device.
The device of claim 28, wherein:

The apparatus further includes: a sending unit, configured to send the access layer context of the terminal device and the identification of the terminal device to a fifth network device, where the fifth network device is the terminal device from the inactive state to Before the connected state, a network device that stores the access layer context and establishes a logical interface with the second network device for the terminal device.
The device according to claims 22-29, wherein the device further comprises:

A sending unit, configured to send an eighth request message carrying the identifier of the terminal device to the network device in the area where the terminal device is located, so as to request the network device in the area where the terminal device is located to page the terminal device;
The apparatus according to claims 22-27, 30, wherein the first network device is an access network device, and the second network device is a core network device.
The apparatus according to any one of claims 22-25 and 28-30, wherein the first network device is an access network network device, and the second network device is an access network network device.
A computer-readable storage medium, characterized in that it is used to store a computer program or instruction, when the computer program or instruction is run on a network device, the network device is made to execute any one of claims 1 to 5 The method described, or the method of any one of claims 6-16.
A computer program product, characterized in that, when the computer program product runs on a network device, the network device is caused to execute the method according to any one of claims 1 to 5, or, as claimed in claim 6 to The method of any one of 16.