CN112399432A

CN112399432A - Information transmission method, device, core network element, access network node and terminal

Info

Publication number: CN112399432A
Application number: CN201910744197.2A
Authority: CN
Inventors: 王妍; 周叶; 彦楠
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2021-02-23

Abstract

The invention provides an information transmission method, an information transmission device, a core network element, an access network node and a terminal, wherein the information transmission method comprises the following steps: after a terminal accesses a first access network RAN node, terminal history information of the terminal is sent to the first RAN node. According to the scheme, no matter what state (such as idle state) the current RAN node is, the new RAN node (namely the first RAN node) initiates access and enters any state (such as connected state), the new RAN node can obtain UE historical information of the UE, and switching optimization is carried out by using the UE historical information; the problem that in the prior art, after the UE enters the RRC idle state, under the condition that another RAN node initiates access and enters the RRC connected state, a new RAN node does not have UE historical information and cannot utilize the UE historical information to perform switching optimization is solved.

Description

Information transmission method, device, core network element, access network node and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to an information transmission method and apparatus, a core network element, an access network node, and a terminal.

Background

Currently, during a handover procedure, a source RAN (access network) node sends UE (terminal) history information to a target RAN node, which is used for the target RAN node to select a target cell more optimally in a subsequent handover procedure. However, if the UE enters an RRC (radio resource control) idle state, then initiates access in another RAN node and enters an RRC connected state, the new RAN node has no UE history information, and thus handover optimization cannot be performed using the UE history information.

Disclosure of Invention

The invention aims to provide an information transmission method, an information transmission device, a core network element, an access network node and a terminal, and solves the problem that in the prior art, after UE enters an RRC idle state, under the condition that another RAN node initiates access and enters an RRC connected state, a new RAN node does not have UE historical information, and switching optimization can not be performed by utilizing the UE historical information.

In order to solve the foregoing technical problem, an embodiment of the present invention provides an information transmission method, which is applied to a core network element, and includes:

after a terminal accesses a first access network RAN node, terminal history information of the terminal is sent to the first RAN node.

Optionally, before sending the terminal history information of the terminal to the first RAN node, the method further includes:

and receiving the terminal history information sent by a second RAN node under the condition that the terminal is connected with the second RAN node before accessing the first RAN node.

Optionally, the terminal history information includes at least one of the following information:

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

the connected cells comprise a main connected cell and/or a secondary connected cell.

Optionally, the cell history information of the connected cell includes: and when the terminal is in a connection state, the cell identification and/or the access duration of the connected cell.

Optionally, the cell history information of the cell where the idle state resides includes: and the cell identification and/or the residence time length of the cell in which the terminal resides when the terminal is in an idle state.

Optionally, the beam history information includes: the terminal comprises at least one of index information of a beam connected when the terminal is in a connected state, access duration corresponding to the beam connected when the terminal is in the connected state, index information of a beam where the terminal resides when the terminal is in an idle state, and residence duration corresponding to the beam where the terminal resides when the terminal is in the idle state.

Optionally, the terminal history information is collected by the terminal or a second RAN node.

The embodiment of the invention also provides an information transmission method, which is applied to the RAN node of the first access network and comprises the following steps:

after a terminal accesses a first RAN node, terminal history information of the terminal sent by a core network element is received.

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

The embodiment of the invention also provides an information transmission method, which is applied to a RAN node of a second access network and comprises the following steps:

and sending the terminal history information of the terminal to a core network element under the condition that the terminal is connected with a second RAN node before accessing the first RAN node.

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

Optionally, when the terminal history information is collected by the terminal, before sending the terminal history information of the terminal to a core network element, the method further includes:

and receiving the terminal history information collected by the terminal.

The embodiment of the invention also provides an information transmission method, which is applied to a terminal and comprises the following steps:

and sending the terminal history information of the terminal collected by the terminal to a second access network (RAN) node.

Optionally, before sending the terminal history information of the terminal collected by the terminal to the RAN node of the second access network, the method further includes:

and collecting the terminal history information from the terminal movement management message.

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

The embodiment of the invention also provides a core network element, which comprises a memory, a processor, a transceiver and a computer program which is stored on the memory and can run on the processor; the processor implements the following steps when executing the program:

after a terminal accesses a first access network RAN node, terminal history information of the terminal is sent to the first RAN node through the transceiver.

Optionally, the processor further implements the following steps when executing the program:

the method includes receiving, by the transceiver, terminal history information sent by a second RAN node before sending the terminal history information of the terminal to a first RAN node and before the terminal accesses the first RAN node, in a case where the terminal connects to the second RAN node.

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

An embodiment of the present invention further provides an access network node, where the access network node is a first RAN node, and the access network node includes a memory, a processor, a transceiver, and a computer program stored in the memory and operable on the processor; the processor implements the following steps when executing the program:

and after the terminal accesses the first RAN node, receiving terminal history information of the terminal, which is sent by a core network element, through the transceiver.

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

An embodiment of the present invention further provides an access network node, where the access network node is a second RAN node, and the access network node includes a memory, a processor, a transceiver, and a computer program stored in the memory and operable on the processor; the processor implements the following steps when executing the program:

and sending the terminal history information of the terminal to a core network element through the transceiver under the condition that the terminal is connected with a second RAN node before accessing the first RAN node.

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

and under the condition that the terminal history information is collected by the terminal, receiving the terminal history information collected by the terminal through the transceiver before sending the terminal history information of the terminal to a core network element.

The embodiment of the invention also provides a terminal, which comprises a memory, a processor, a transceiver and a computer program which is stored on the memory and can run on the processor; the processor implements the following steps when executing the program:

and sending the terminal history information of the terminal collected by the terminal to a second access network (RAN) node through the transceiver.

the terminal history information is collected from a terminal mobility management message before sending the terminal history information of the terminal collected by the terminal to a second access network RAN node.

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the information transmission method on the network element side of the core network; or

The program is executed by a processor to realize the information transmission method of the first RAN node side; or

The program is executed by a processor to implement the information transmission method of the second RAN node side; or

The program realizes the steps of the above-described terminal-side information transmission method when executed by a processor.

The embodiment of the present invention further provides an information transmission apparatus, which is applied to a core network element, and includes:

the first sending module is configured to send terminal history information of a terminal to a first access network RAN node after the terminal accesses the first RAN node.

Optionally, the method further includes:

a first receiving module, configured to receive, before sending terminal history information of the terminal to a first RAN node, the terminal history information sent by a second RAN node when the terminal is connected to the second RAN node before accessing the first RAN node.

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

The embodiment of the present invention further provides an information transmission apparatus, which is applied to a RAN node of a first access network, and includes:

and the second receiving module is used for receiving the terminal history information of the terminal sent by the network element of the core network after the terminal accesses the first RAN node.

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

The embodiment of the present invention further provides an information transmission apparatus, which is applied to a RAN node of a second access network, and includes:

and the second sending module is used for sending the terminal history information of the terminal to a core network element under the condition that the terminal is connected with the second RAN node before accessing the first RAN node.

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

Optionally, the method further includes:

a third receiving module, configured to receive the terminal history information collected by the terminal before sending the terminal history information of the terminal to a core network element under a condition that the terminal history information is collected by the terminal.

The embodiment of the invention also provides an information transmission device, which is applied to a terminal and comprises the following components:

and a third sending module, configured to send, to a second access network RAN node, the terminal history information of the terminal collected by the terminal.

Optionally, the method further includes:

the first processing module is used for collecting the terminal history information from the terminal mobility management message before sending the terminal history information of the terminal collected by the terminal to a second access network RAN node.

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

The technical scheme of the invention has the following beneficial effects:

in the above scheme, the information transmission method sends the terminal history information of the terminal to the first RAN node after the terminal accesses the first RAN node; no matter what state (such as idle state) the current RAN node of the UE is, when a new RAN node (i.e., the first RAN node) initiates access and enters any state (such as connected state), the new RAN node can obtain UE history information of the UE, and performs handover optimization by using the UE history information; the problem that in the prior art, after the UE enters the RRC idle state, under the condition that another RAN node initiates access and enters the RRC connected state, a new RAN node does not have UE historical information and cannot utilize the UE historical information to perform switching optimization is solved.

Drawings

Fig. 1 is a first flowchart illustrating an information transmission method according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of an information transmission method according to an embodiment of the present invention;

fig. 3 is a third schematic flow chart of an information transmission method according to an embodiment of the present invention;

fig. 4 is a fourth schematic flow chart of an information transmission method according to an embodiment of the present invention;

fig. 5 is a first schematic flow chart illustrating a specific application of the information transmission method according to the embodiment of the present invention;

fig. 6 is a schematic diagram of a specific application flow of the information transmission method according to the embodiment of the present invention;

fig. 7 is a schematic view illustrating a specific application flow of the information transmission method according to the embodiment of the present invention;

fig. 8 is a schematic view illustrating a specific application flow of the information transmission method according to the embodiment of the present invention;

FIG. 9 is a schematic diagram of an overall architecture of a dual-connection EN-DC according to an embodiment of the present invention;

fig. 10 is a schematic diagram illustrating a process of a terminal from an idle state to a connected state according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a network element of a core network according to an embodiment of the present invention;

fig. 12 is a first schematic structural diagram of an access network node according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of an access network node according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

FIG. 15 is a first schematic structural diagram of an information transmission apparatus according to an embodiment of the present invention;

FIG. 16 is a second schematic structural diagram of an information transmission apparatus according to an embodiment of the present invention;

FIG. 17 is a third schematic structural diagram of an information transmission apparatus according to an embodiment of the present invention;

fig. 18 is a fourth schematic structural diagram of an information transmission apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

The present invention provides an information transmission method, applied to a core network element, as shown in fig. 1, for solving the problem that a new RAN node has no UE history information and cannot perform handover optimization by using UE history information when another RAN node initiates access and enters an RRC connected state after a UE enters an RRC idle state in the prior art, including:

step 11: after a terminal accesses a first access network RAN node, terminal history information of the terminal is sent to the first RAN node.

The information transmission method provided by the embodiment of the invention sends the terminal history information of the terminal to the first RAN node after the terminal accesses the first RAN node; no matter what state (such as idle state) the current RAN node of the UE is, when a new RAN node (i.e., the first RAN node) initiates access and enters any state (such as connected state), the new RAN node can obtain UE history information of the UE, and performs handover optimization by using the UE history information; the problem that in the prior art, after the UE enters the RRC idle state, under the condition that another RAN node initiates access and enters the RRC connected state, a new RAN node does not have UE historical information and cannot utilize the UE historical information to perform switching optimization is solved.

Step 11 may specifically be: in the process of establishing the initial context of the user terminal, sending terminal history information of the terminal to a first RAN node; the terminal history information may specifically include: terminal history information for a terminal accessing a first RAN node. More specifically, it may be: carrying the terminal history information in the UE context initial establishment request, and sending the terminal history information to a first RAN node; but not limited thereto.

Further, before sending the terminal history information of the terminal to the first RAN node, the method further includes: and receiving the terminal history information sent by a second RAN node under the condition that the terminal is connected with the second RAN node before accessing the first RAN node.

The step of receiving the history information of the terminal may specifically be: receiving the terminal history information sent by a second RAN node in the terminal context release process; the second RAN node may specifically be: the terminal accesses a RAN node to which the terminal previously accessed. More specifically, the method can be as follows: and receiving a terminal context release completion signaling sent by a second RAN node, wherein the terminal context release completion signaling carries the terminal history information.

In this embodiment of the present invention, the terminal history information includes at least one of the following information: cell history information of a connected cell; cell history information of a cell in which an idle state resides; and beam history information; the connected cells comprise a main connected cell and/or a secondary connected cell.

Specifically, the cell history information of the connected cell includes: the cell identification and/or access duration of the cell connected when the terminal is in the connected state; and/or

The cell history information of the cell in which the idle state resides includes: the cell identification and/or the residence time length of the cell in which the terminal resides when the terminal is in an idle state; and/or

The beam history information includes: the terminal comprises at least one of index information of a beam connected when the terminal is in a connected state, access duration corresponding to the beam connected when the terminal is in the connected state, index information of a beam where the terminal resides when the terminal is in an idle state, and residence duration corresponding to the beam where the terminal resides when the terminal is in the idle state.

Wherein the terminal history information is collected by the terminal or a second RAN node.

An embodiment of the present invention further provides an information transmission method, applied to a RAN node of a first access network, as shown in fig. 2, including:

step 21: after a terminal accesses a first RAN node, terminal history information of the terminal sent by a core network element is received.

The information transmission method provided by the embodiment of the invention receives the terminal history information of the terminal sent by the network element of the core network after the terminal accesses the first RAN node; no matter what state (such as idle state) the current RAN node of the UE is, when a new RAN node (i.e., the first RAN node) initiates access and enters any state (such as connected state), the new RAN node can obtain UE history information of the UE, and performs handover optimization by using the UE history information; the problem that in the prior art, after the UE enters the RRC idle state, under the condition that another RAN node initiates access and enters the RRC connected state, a new RAN node does not have UE historical information and cannot utilize the UE historical information to perform switching optimization is solved.

Step 21 may specifically be: receiving terminal history information sent by a network element of a core network in the process of establishing an initial context of a user terminal; the terminal history information may specifically include: terminal history information for a terminal accessing a first RAN node. More specifically, it may be: receiving terminal context initial establishment request information sent by a core network element; wherein, the terminal context initial establishment request information carries the terminal history information.

Wherein the terminal history information is collected by the terminal or a second RAN node; the second RAN node may specifically be: the terminal accesses a RAN node to which the terminal previously accessed.

An embodiment of the present invention further provides an information transmission method, which is applied to a RAN node of a second access network, and as shown in fig. 3, the method includes:

step 31: and sending the terminal history information of the terminal to a core network element under the condition that the terminal is connected with a second RAN node before accessing the first RAN node.

The information transmission method provided by the embodiment of the invention sends the terminal history information of the terminal to a core network element under the condition that the terminal is connected with a second RAN node before accessing a first RAN node; the method can support and realize that no matter what state (such as idle state) the UE is in at the current RAN node (i.e. the second RAN node), under the condition that the new RAN node (i.e. the first RAN node) initiates access and enters any state (such as connected state), the new RAN node can obtain UE historical information of the UE, and switching optimization is performed by using the UE historical information; the problem that in the prior art, after the UE enters the RRC idle state, under the condition that another RAN node initiates access and enters the RRC connected state, a new RAN node does not have UE historical information and cannot utilize the UE historical information to perform switching optimization is solved.

Step 31 may specifically be: in the process of releasing the terminal context, sending terminal history information to a network element of a core network; wherein the terminal history information includes: terminal history information of a terminal accessing the second RAN node before the terminal context release procedure is performed. More specifically, it may be: sending a terminal context release completion signaling to a core network element; wherein, the terminal context release completion signaling carries the terminal history information.

Further, in a case where the terminal history information is collected by the terminal, before sending the terminal history information of the terminal to a core network element, the method further includes: and receiving the terminal history information collected by the terminal.

An embodiment of the present invention further provides an information transmission method, applied to a terminal, as shown in fig. 4, including:

step 41: and sending the terminal history information of the terminal collected by the terminal to a second access network (RAN) node.

The information transmission method provided by the embodiment of the invention sends the terminal history information of the terminal collected by the terminal to a RAN node of a second access network; the method can support and realize that no matter what state (such as idle state) the UE is in at the current RAN node (i.e. the second RAN node), under the condition that the new RAN node (i.e. the first RAN node) initiates access and enters any state (such as connected state), the new RAN node can obtain UE historical information of the UE, and switching optimization is performed by using the UE historical information; the problem that in the prior art, after the UE enters the RRC idle state, under the condition that another RAN node initiates access and enters the RRC connected state, a new RAN node does not have UE historical information and cannot utilize the UE historical information to perform switching optimization is solved.

Further, before sending the terminal history information of the terminal collected by the terminal to a second access network RAN node, the method further includes: and collecting the terminal history information from the terminal movement management message.

The information transmission method provided by the embodiment of the present invention is further described below with reference to multiple sides, such as a core network element, an access network node, and a terminal.

In view of the above technical problems, an embodiment of the present invention provides an information transmission method, and in particular, to a method for maintaining history information of a UE, where the following illustrates a scheme provided in the embodiment of the present invention:

specifically, for example, in the process of establishing the initial context by the UE, the core network (for short, the network element of the core network) sends, to a new RAN (radio access network) node, UE history information related to a list of access or camping cells, corresponding time duration, and the like when the UE previously accesses the mobile communication network, so as to assist the new RAN node in optimally selecting the primary cell or the secondary cell according to the UE history information.

The scheme of this example mainly relates to:

in the process of establishing the initial context of the user terminal, the core network provides UE historical information for the RAN node;

wherein, the UE history information sent by the core network to the RAN node is expanded but not limited to at least one of the following:

(1) the primary cell information and/or the secondary cell information connected in the connected state may include, but is not limited to, a cell identifier, an access duration, and the like.

(2) The cell information of the cell where the idle state resides may include, but is not limited to, a cell identifier, a residence time, and the like.

(3) beam history information, which may include but is not limited to beam information for UE connection (connected when UE is in connected state) or camping (camped when UE is in idle state);

specifically, the beam information connected to the UE may include a beam index, an access duration, and the like; the access time may also be understood as a beam index of a primary cell or a secondary cell to which the UE is connected, a corresponding access duration, and the like.

The beam information where the UE resides may include a beam index, a residence time, and the like; the UE may also be understood as a beam index of a cell where the UE resides, a corresponding residence time, and the like.

The UE history information may be collected by the RAN node or the UE, but not limited thereto, and the following description specifically illustrates:

example 1: assuming that the UE history information is the primary cell history information collected by the RAN node, the information transmission method provided in the embodiment of the present invention may be specifically as shown in fig. 5 (an AMF in the figure is an authentication management function and represents a core network element), including:

step 51: before the UE accesses the new RAN node 2 in an idle state, the UE performs a UE context release procedure with the previous RAN node 1, and the RAN node 1 sends a signaling carrying UE history information in a context release completion to the core network, that is, (called) current UE history information (UE history information of current UE) temporarily stored by the core network.

Step 52: the UE enters the connected state after being connected to the RAN node 2 by an RRC IDLE state (IDLE). The RAN node 2 accessed at this time does not store therein UE history information of the UE.

Step 53: RAN node 2 sends an Initial UE Message (Initial UE Message) to the core network, informing the core network that the UE has entered the connected state.

Step 54: the core network sends an initial context setup request message to the RAN node 2 through an NR (new air interface) system context setup procedure. The initial context setup request message includes UE history information, which may include: cell identification, type of cells to which the UE has been connected in sequence when accessing the mobile communication network, and information on the length of time that the UE stays in the cells, respectively. The UE history information may also include beam-related history information, such as beam index and access and/or dwell length information on each beam, so that the target RAN node (i.e., RAN node 2) for handover may better select a beam.

Step 55: in a subsequent handover procedure, the RAN node 2 may select the most suitable target cell according to the history information of the UE. For example, during the handover procedure, the UE history information may be referred to by the RAN node 2 as handover preparation related information, so as to preferentially select a cell that the UE ever accesses or camps on as a target cell for handover, and preferentially allocate a dedicated resource on a beam that the UE ever accesses or camps on for access.

Example 2: assuming that the UE history information is the history information of the primary cell collected by the UE, the information transmission method provided in the embodiment of the present invention may be specifically as shown in fig. 6 (AMF in the figure is an authentication management function and represents a network element of a core network), including:

step 61: the history information collected by the terminal in the UE mobility management message includes cell information in an idle state and a connected state, that is, the history information collected by the UE includes "connected" primary cell information and "camped" cell information, and the cell information includes a cell identifier and information of a time length of connection or camping of a corresponding cell. The UE history information may further include beam-related history information, such as beam index and access and/or dwell time length information in each beam, and the UE reports the collected cell information and sends the cell information to the RAN node 1 for storage.

Step 62-66: similar to steps 51-55 in example 1, the most suitable target cell is selected in the subsequent handover procedure, which is not described herein again.

Example 3: assuming that the UE history information is history information of the primary cell and the secondary cell collected by the RAN node, the information transmission method provided in the embodiment of the present invention may be specifically as shown in fig. 7 (an AMF in the figure is an authentication management function and indicates a core network element), including:

step 71: under the background of dual connectivity or CA (carrier aggregation) addition, before a UE accesses a new RAN node 2 from an idle state, the UE performs a UE context release procedure with a previous RAN node 1, and the RAN node 1 sends a signaling that the UE context release is completed to a core network, where the signaling carries UE history information, that is, current UE history information (UE history information of current UE) temporarily stored by the core network.

Step 72: the UE enters the connected state after being connected to the RAN node 2 in the RRC idle state. No history information for the UE is stored in the new RAN node 2 at this time.

Step 73: RAN node 2 sends an Initial UE Message (Initial UE Message) to the core network, informing the core network that the UE has entered the connected state.

Step 74: through the NR system context establishment procedure, the core network sends an initial context establishment request message to the RAN node 2. The initial context setup request message includes UE history information, which may include: when the UE accesses the mobile communication network, the cell identifiers and types of the primary cells and/or secondary cells that the UE has connected in sequence, and the information of the time lengths of stays in the primary cells and/or secondary cells, respectively, and meanwhile, the UE history information may further include beam history information related to the primary cells and/or secondary cells under the MN (master node) and/or SN (secondary node), such as beam indexes and information of the time lengths of related accesses and/or stays of each beam.

Step 75: during subsequent CA and/or dual connectivity addition, the RAN node 2 may select the most suitable primary cell and/or secondary cell according to the UE history information including the primary and/or secondary cell related information, for example, during handover, the UE history information may be referred to by the RAN node 2 as handover preparation related information, so as to preferentially select a cell that the UE has accessed or resided in as a primary cell, and preferentially allocate dedicated resources on a beam that the UE has accessed or resided in for access.

It is explained herein that the UE may perform a data receiving and transmitting process with multiple cells while the UE is in a dual connectivity or CA addition process. The cell connected with the UE for control plane signaling transmission is a main cell, and the cell connected with the UE only for data transceiving and improving the peak transmission rate is an auxiliary cell.

Example 4: assuming that the UE history information is history information of the primary cell and the secondary cell collected by the UE node, the information transmission method provided in the embodiment of the present invention may be specifically as shown in fig. 8 (AMF in the figure is an authentication management function and represents a network element of a core network), including:

step 81: in the context of dual connectivity or CA addition, the history information collected by the terminal in the UE mobility management message includes cell information in idle state and connected state, that is, the history information collected by the UE includes "connected" primary cell information and "camped" cell information, and the cell information includes a cell identifier and information of time length that the cell is connected to and/or camped on. The UE history information also includes related information about the secondary cell, such as the secondary cell identifier and the time length information of accessing the secondary cell, so as to further refine the location information of the UE. The UE history information may further include beam history information related to the primary cell and/or the secondary cell under the MN and/or the SN, for example, beam indexes, time length information related to access and/or camping of each beam, and the like. The UE reports the collected UE history information, and sends the reported UE history information to the RAN node 1 for storage.

And 82-86: as with steps 71-75 in example 3, during subsequent CA and/or dual connectivity addition, the RAN node may select the most suitable primary and/or secondary cell based on the UE history information including information about the primary and/or secondary cell.

From the above, examples provided by embodiments of the present invention relate to:

(1) the core network provides the RAN node 2 with UE history information during the initial context establishment;

the UE history information includes: history information of a primary cell to which the UE is connected, the history information of the primary cell may include: cell identification of a main cell connected when the UE is in a connected state, time length information of a connected cell and the like; and/or the presence of a gas in the gas,

the UE history information includes: history information of an auxiliary cell connected by the UE, wherein the history information of the auxiliary cell can comprise cell identification of the auxiliary cell connected by the UE, time length information of the connected cell and the like; and/or the presence of a gas in the gas,

the UE history information includes: cell identification of a cell where the UE resides when the UE is in an idle state, time length information of the cell where the UE resides, and the like.

(2) Under the condition of (1), the RAN node 1 may provide the UE history information to the core network in a UE context release procedure.

(3) Under the condition of (1), the UE history information may further include: the index and access time length information of the beam to which the UE is connected, and/or the index and dwell time length information of the beam in which the UE resides, and/or the like.

To sum up, the above example scheme provided by the embodiment of the present invention: in the initial context establishing process, the core network provides UE history information to the RAN node 2, which can ensure that the secondary network side (RAN node 2) performs optimal selection of the primary cell or the secondary cell according to the UE history information.

The following explains the related concepts involved in the embodiments of the present invention:

(1) UE History information

The UE history information comprises the relevant information of one or more cells which are resided or accessed, and each cell information is an independent entry. When the UE changes the serving cell (for idle state) or PCell (primary cell, for connected state) and enters an out-of-service state or other RAT (radio access technology), the UE records the cell ID, type and dwell time information of the previously camped cell or the cell ID, type and access time information of the previously accessed cell. When the UE enters an evolved UMTS (universal mobile telecommunications system) terrestrial radio access E-UTRA (connected state or idle state) and is not in a service state in the current RAT before, the UE records only one element of time information of camping on or access to other RATs in the service-free state or other RATs.

The UE history information maintained by the LTE system UE comprises idle and connected records. One UE holds up to 16 UE history information entries, each entry may be cell information, or no service information or other RAT information. And if the maximum storage limit is reached, deleting the earliest reserved information entry preferentially to ensure that the UE does not exceed the maximum storage limit.

(2) Carrier aggregation CA

In the LTE system, carrier aggregation ca (carrier aggregation) is a concept that resources of a plurality of cells are combined together to serve one UE to achieve a faster transmission rate, and a primary cell (PCell) connected with a control plane and a secondary cell (SCell) performing data transmission are introduced in order to better manage the resources of the plurality of cells. The uplink (or downlink) carriers of the PCell correspond to the uplink (or downlink) primary carriers of the physical layer, respectively, and the uplink (or downlink) carriers of the SCell correspond to the uplink (or downlink) secondary carriers of the physical layer, respectively. Only one PCell may be provided, and a plurality of scells may be provided.

(3) Dual connection DC

In the NR system, a dual connectivity dc (dual connectivity) refers to that a UE is connected to a primary node mn (master node) and a secondary node sn (secondary node), and signaling and/or data interaction is performed between the two nodes, where the primary and secondary nodes may be LTE, e-LTE, or NR nodes. When the MN is an LTE node and the SN is an NR node, the node is defined as an EN-DC (E-UTRA-NR Dual Connectivity) Dual connection, and the overall architecture diagram of the node is shown in FIG. 9; otherwise, the NE-DC dual connection is defined.

MME in fig. 9 represents mobility management entity; S-GW represents a serving gateway; EPC denotes a core network of 4G; en-gNB denotes a network node providing NR user plane and control plane protocols towards UEs and connected to EPC through S1-U interface; eNB represents a network node providing E-UTRA user plane and control plane protocols towards the UE and connected to the EPC through an S1 interface; E-UTRAN stands for evolved UMTS terrestrial radio Access network; S1-U represents the interface between en-gNB and EPC; s1 denotes the interface between eNB and EPC; X2-U represents the interface between en-gNB and en-gNB; x2 represents the interface between en-gbb and eNB, or between eNB and eNB.

(4) User terminal context establishment procedure

As shown in fig. 10, a signaling flow from an IDLE state to a CONNECTED state for a UE includes an initial context setup procedure from a base station to a core network side for the UE. When step 104 is completed, the UE is converted from the IDLE state to the CONNECTED state.

Specifically, the flow shown in fig. 10 includes:

step 101: under the condition that the terminal is in an RRC IDLE state (UE in RRC _ IDLE), the UE sends an RRC establishment Request (RRC Setup Request) to the RAN node;

step 102: RAN feeds back a signaling (RRC Setup) established by RRC to UE, and the UE enters (connection management IDLE CM IDLE) RRC connection state (UE in RRC _ CONNECTED) after receiving data;

step 103: the UE feeds back an RRC Setup Complete message (RRC Setup Complete) to the RAN; then the UE enters (connection management CONNECTED CM CONNECTED) RRC connection state;

step 104: RAN sends an INITIAL UE MESSAGE (INITIAL UE MESSAGE) to AMF;

step 105: DOWNLINK NAS (non-access stratum) transmission (DOWNLINK NAS TRANSPORT) is carried out between the AMF and the RAN;

step 106: performing downlink information transfer (DL information transfer) between the RAN and the UE;

step 107: performing uplink information transfer (UL information transfer) between the UE and the RAN;

step 108: performing UPLINK NAS TRANSPORT (UPLINK NAS TRANSPORT) between the RAN and the AMF;

step 109: AMF sends an INITIAL CONTEXT SETUP REQUEST (INITIAL CONTEXT SETUP REQUEST) to RAN;

step 1010: security and RRC Reconfiguration procedures (Security and RRC Reconfiguration procedure) between the RAN and the UE;

step 1011: RAN sends an INITIAL CONTEXT SETUP RESPONSE (INITIAL CONTEXT SETUP RESPONSE) to AMF;

step 1012: first Uplink Data and First Downlink Data (First Uplink Data and First Downlink Data) are transmitted among the AMF, the RAN and the UE;

step 1013: the RAN sends a UE CONTEXT RELEASE REQUEST (UE CONTEXT RELEASE REQUEST) to the AMF;

step 1014: the AMF sends a UE CONTEXT RELEASE COMMAND (UE CONTEXT RELEASE COMMAND) to the RAN;

step 1015: the RAN sends RRC Connection Release (RRC Connection Release) to the UE;

step 1016: the RAN sends the AMF a UE CONTEXT RELEASE COMPLETE (UE CONTEXT RELEASE COMPLETE).

Steps

109 and 1016 are a user terminal context establishment request sent by the core network (AMF) to the RAN node and a signaling message sent by the RAN node to the core network for completing the context release, respectively.

(5) Beam (wave beam)

The NR system introduces a beam scanning technique, i.e. the base station only transmits one or several beam directions at a certain time, and transmits different beams through multiple times to cover all directions required by the whole cell. Each beam corresponds to a synchronization broadcast block ssb (synchronization Signal block) for synchronization and reading of the main information block. The terminal can judge the current optimal beam by acquiring the SSB.

An embodiment of the present invention further provides a core network element, as shown in fig. 11, including a memory 111, a processor 112, a transceiver 113, and a computer program 114 stored in the memory 111 and operable on the processor 112; the processor 112, when executing the program, performs the following steps:

after the terminal accesses the first access network RAN node, the terminal history information of the terminal is transmitted to the first RAN node through the transceiver 113.

After a terminal accesses a first access network RAN node, the core network element provided in the embodiment of the present invention sends terminal history information of the terminal to the first RAN node through the transceiver 113; no matter what state (such as idle state) the current RAN node of the UE is, when a new RAN node (i.e., the first RAN node) initiates access and enters any state (such as connected state), the new RAN node can obtain UE history information of the UE, and performs handover optimization by using the UE history information; the problem that in the prior art, after the UE enters the RRC idle state, under the condition that another RAN node initiates access and enters the RRC connected state, a new RAN node does not have UE historical information and cannot utilize the UE historical information to perform switching optimization is solved.

Further, the processor executes the program to further implement the following steps: the method includes receiving, by the transceiver, terminal history information sent by a second RAN node before sending the terminal history information of the terminal to a first RAN node and before the terminal accesses the first RAN node, in a case where the terminal connects to the second RAN node.

The implementation embodiments of the information transmission method on the side of the core network element are all applicable to the embodiment of the core network element, and the same technical effect can be achieved.

An embodiment of the present invention further provides an access network node, which is a first RAN node, as shown in fig. 12, including a memory 121, a processor 122, a transceiver 123, and a computer program 124 stored in the memory 121 and executable on the processor 122; the processor 122, when executing the program, implements the following steps:

after a terminal accesses a first RAN node, terminal history information of the terminal sent by a core network element is received through the transceiver 123.

After a terminal accesses a first RAN node, the access network node provided in the embodiment of the present invention receives, through the transceiver 123, terminal history information of the terminal sent by a core network element; no matter what state (such as idle state) the current RAN node of the UE is, when a new RAN node (i.e., the first RAN node) initiates access and enters any state (such as connected state), the new RAN node can obtain UE history information of the UE, and performs handover optimization by using the UE history information; the problem that in the prior art, after the UE enters the RRC idle state, under the condition that another RAN node initiates access and enters the RRC connected state, a new RAN node does not have UE historical information and cannot utilize the UE historical information to perform switching optimization is solved.

The implementation embodiments of the information transmission method on the first RAN node side are all applicable to the embodiment of the access network node, and the same technical effect can be achieved.

An embodiment of the present invention further provides an access network node, which is a second RAN node, as shown in fig. 13, including a memory 131, a processor 132, a transceiver 133, and a computer program 134 stored in the memory 131 and operable on the processor 132; the processor 132, when executing the program, performs the following steps:

in case that the terminal is connected to a second RAN node before accessing the first RAN node, the terminal history information of the terminal is transmitted to a core network element through the transceiver 133.

Before the access network node provided by the embodiment of the present invention accesses a first RAN node through a terminal, the access network node sends terminal history information of the terminal to a core network element through the transceiver 133 under the condition of being connected to a second RAN node; the method can support and realize that no matter what state (such as idle state) the UE is in at the current RAN node (i.e. the second RAN node), under the condition that the new RAN node (i.e. the first RAN node) initiates access and enters any state (such as connected state), the new RAN node can obtain UE historical information of the UE, and switching optimization is performed by using the UE historical information; the problem that in the prior art, after the UE enters the RRC idle state, under the condition that another RAN node initiates access and enters the RRC connected state, a new RAN node does not have UE historical information and cannot utilize the UE historical information to perform switching optimization is solved.

Further, the processor executes the program to further implement the following steps: and under the condition that the terminal history information is collected by the terminal, receiving the terminal history information collected by the terminal through the transceiver before sending the terminal history information of the terminal to a core network element.

The implementation embodiments of the information transmission method on the second RAN node side are all applicable to the embodiment of the access network node, and the same technical effect can be achieved.

An embodiment of the present invention further provides a terminal, as shown in fig. 14, including a memory 141, a processor 142, a transceiver 143, and a computer program 144 stored on the memory 141 and operable on the processor 142; the processor 142 implements the following steps when executing the program:

the terminal history information of the terminal collected by the terminal is sent to a second access network RAN node via the transceiver 143.

The terminal provided by the embodiment of the present invention sends the terminal history information of the terminal collected by the terminal to a RAN node of a second access network through the transceiver 143; the method can support and realize that no matter what state (such as idle state) the UE is in at the current RAN node (i.e. the second RAN node), under the condition that the new RAN node (i.e. the first RAN node) initiates access and enters any state (such as connected state), the new RAN node can obtain UE historical information of the UE, and switching optimization is performed by using the UE historical information; the problem that in the prior art, after the UE enters the RRC idle state, under the condition that another RAN node initiates access and enters the RRC connected state, a new RAN node does not have UE historical information and cannot utilize the UE historical information to perform switching optimization is solved.

Further, the processor executes the program to further implement the following steps: the terminal history information is collected from a terminal mobility management message before sending the terminal history information of the terminal collected by the terminal to a second access network RAN node.

The implementation embodiments of the information transmission method at the terminal side are all applicable to the embodiment of the terminal, and the same technical effects can be achieved.

The implementation embodiments of the information transmission methods at the network element side of the core network, the first RAN node side, the second RAN node side, and the terminal side are all applicable to the embodiment of the computer-readable storage medium, and the same technical effects can be achieved.

An embodiment of the present invention further provides an information transmission apparatus, which is applied to a core network element, as shown in fig. 15, and includes:

a first sending module 151, configured to send terminal history information of a terminal to a first access network RAN node after the terminal accesses the first RAN node.

The information transmission device provided by the embodiment of the invention sends the terminal history information of the terminal to the first RAN node after the terminal accesses the first RAN node; no matter what state (such as idle state) the current RAN node of the UE is, when a new RAN node (i.e., the first RAN node) initiates access and enters any state (such as connected state), the new RAN node can obtain UE history information of the UE, and performs handover optimization by using the UE history information; the problem that in the prior art, after the UE enters the RRC idle state, under the condition that another RAN node initiates access and enters the RRC connected state, a new RAN node does not have UE historical information and cannot utilize the UE historical information to perform switching optimization is solved.

Further, the information transmission apparatus further includes: a first receiving module, configured to receive, before sending terminal history information of the terminal to a first RAN node, the terminal history information sent by a second RAN node when the terminal is connected to the second RAN node before accessing the first RAN node.

The implementation embodiments of the information transmission method on the network element side of the core network are all applicable to the embodiment of the information transmission device, and the same technical effect can be achieved.

An embodiment of the present invention further provides an information transmission apparatus, which is applied to a RAN node of a first access network, and as shown in fig. 16, the apparatus includes:

a second receiving module 161, configured to receive, after the terminal accesses the first RAN node, terminal history information of the terminal sent by a network element of a core network.

The information transmission device provided by the embodiment of the invention receives the terminal history information of the terminal sent by the network element of the core network after the terminal accesses the first RAN node; no matter what state (such as idle state) the current RAN node of the UE is, when a new RAN node (i.e., the first RAN node) initiates access and enters any state (such as connected state), the new RAN node can obtain UE history information of the UE, and performs handover optimization by using the UE history information; the problem that in the prior art, after the UE enters the RRC idle state, under the condition that another RAN node initiates access and enters the RRC connected state, a new RAN node does not have UE historical information and cannot utilize the UE historical information to perform switching optimization is solved.

The implementation embodiments of the information transmission method on the first RAN node side are all applicable to the embodiment of the information transmission apparatus, and the same technical effect can be achieved.

An embodiment of the present invention further provides an information transmission apparatus, which is applied to a RAN node of a second access network, and as shown in fig. 17, the information transmission apparatus includes:

the second sending module 171 is configured to send the terminal history information of the terminal to a core network element when the terminal is connected to a second RAN node before accessing the first RAN node.

The information transmission device provided by the embodiment of the invention sends the terminal history information of the terminal to a core network element under the condition that the terminal is connected with a second RAN node before accessing a first RAN node; the method can support and realize that no matter what state (such as idle state) the UE is in at the current RAN node (i.e. the second RAN node), under the condition that the new RAN node (i.e. the first RAN node) initiates access and enters any state (such as connected state), the new RAN node can obtain UE historical information of the UE, and switching optimization is performed by using the UE historical information; the problem that in the prior art, after the UE enters the RRC idle state, under the condition that another RAN node initiates access and enters the RRC connected state, a new RAN node does not have UE historical information and cannot utilize the UE historical information to perform switching optimization is solved.

Further, the information transmission apparatus further includes: a third receiving module, configured to receive the terminal history information collected by the terminal before sending the terminal history information of the terminal to a core network element under a condition that the terminal history information is collected by the terminal.

The implementation embodiments of the information transmission method at the second RAN node side are all applicable to the embodiment of the information transmission apparatus, and the same technical effect can be achieved.

An embodiment of the present invention further provides an information transmission apparatus, which is applied to a terminal, and as shown in fig. 18, the information transmission apparatus includes:

a third sending module 181, configured to send, to a RAN node of a second access network, terminal history information of the terminal collected by the terminal.

The information transmission device provided by the embodiment of the invention sends the terminal history information of the terminal collected by the terminal to a RAN node of a second access network; the method can support and realize that no matter what state (such as idle state) the UE is in at the current RAN node (i.e. the second RAN node), under the condition that the new RAN node (i.e. the first RAN node) initiates access and enters any state (such as connected state), the new RAN node can obtain UE historical information of the UE, and switching optimization is performed by using the UE historical information; the problem that in the prior art, after the UE enters the RRC idle state, under the condition that another RAN node initiates access and enters the RRC connected state, a new RAN node does not have UE historical information and cannot utilize the UE historical information to perform switching optimization is solved.

Further, the information transmission apparatus further includes: the first processing module is used for collecting the terminal history information from the terminal mobility management message before sending the terminal history information of the terminal collected by the terminal to a second access network RAN node.

The implementation embodiments of the information transmission method at the terminal side are all applicable to the embodiment of the information transmission device, and the same technical effects can be achieved.

It should be noted that many of the functional units described in this specification have been referred to as modules, in order to more particularly emphasize their implementation independence.

In embodiments of the present invention, modules may be implemented in software for execution by various types of processors. An identified module of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be constructed as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but may comprise disparate instructions stored in different bits which, when joined logically together, comprise the module and achieve the stated purpose for the module.

Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices. Likewise, operational data may be identified within the modules and may be embodied in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations including over different storage devices, and may exist, at least partially, merely as electronic signals on a system or network.

When a module can be implemented by software, considering the level of existing hardware technology, a module implemented by software may build a corresponding hardware circuit to implement a corresponding function, without considering cost, and the hardware circuit may include a conventional Very Large Scale Integration (VLSI) circuit or a gate array and an existing semiconductor such as a logic chip, a transistor, or other discrete components. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices or the like.

While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims

1. An information transmission method applied to a core network element is characterized by comprising the following steps:

2. The information transmission method according to claim 1, further comprising, before transmitting the terminal history information of the terminal to the first RAN node:

3. The information transmission method according to claim 1, wherein the terminal history information includes at least one of the following information:

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

4. The information transmission method according to claim 3, wherein the cell history information of the connected cell comprises: and when the terminal is in a connection state, the cell identification and/or the access duration of the connected cell.

5. The information transmission method according to claim 3, wherein the cell history information of the cell in which the idle state resides includes: and the cell identification and/or the residence time length of the cell in which the terminal resides when the terminal is in an idle state.

6. The information transmission method according to claim 3, wherein the beam history information includes: the terminal comprises at least one of index information of a beam connected when the terminal is in a connected state, access duration corresponding to the beam connected when the terminal is in the connected state, index information of a beam where the terminal resides when the terminal is in an idle state, and residence duration corresponding to the beam where the terminal resides when the terminal is in the idle state.

7. The information transmission method according to claim 1 or 2, wherein the terminal history information is collected by the terminal or a second RAN node.

8. An information transmission method applied to a first access network (RAN) node, the method comprising:

9. The information transmission method according to claim 8, wherein the terminal history information includes at least one of the following information:

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

10. The information transmission method according to claim 9, wherein the cell history information of the connected cell comprises: and when the terminal is in a connection state, the cell identification and/or the access duration of the connected cell.

11. The information transmission method according to claim 9, wherein the cell history information of the cell in which the idle state resides includes: and the cell identification and/or the residence time length of the cell in which the terminal resides when the terminal is in an idle state.

12. The information transmission method according to claim 9, wherein the beam history information includes: the terminal comprises at least one of index information of a beam connected when the terminal is in a connected state, access duration corresponding to the beam connected when the terminal is in the connected state, index information of a beam where the terminal resides when the terminal is in an idle state, and residence duration corresponding to the beam where the terminal resides when the terminal is in the idle state.

13. The information transmission method according to claim 8, wherein the terminal history information is collected by the terminal or a second RAN node.

14. An information transmission method applied to a second access network (RAN) node is characterized by comprising the following steps:

15. The information transmission method according to claim 14, wherein the terminal history information includes at least one of the following information:

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

16. The information transmission method according to claim 15, wherein the cell history information of the connected cell comprises: and when the terminal is in a connection state, the cell identification and/or the access duration of the connected cell.

17. The information transmission method according to claim 15, wherein the cell history information of the cell in which the idle state resides includes: and the cell identification and/or the residence time length of the cell in which the terminal resides when the terminal is in an idle state.

18. The information transmission method according to claim 15, wherein the beam history information includes: the terminal comprises at least one of index information of a beam connected when the terminal is in a connected state, access duration corresponding to the beam connected when the terminal is in the connected state, index information of a beam where the terminal resides when the terminal is in an idle state, and residence duration corresponding to the beam where the terminal resides when the terminal is in the idle state.

19. The information transmission method according to claim 14, wherein the terminal history information is collected by the terminal or a second RAN node.

20. The information transmission method according to claim 14 or 19, wherein in a case where the terminal history information is collected by the terminal, before transmitting the terminal history information of the terminal to a core network element, further comprising:

and receiving the terminal history information collected by the terminal.

21. An information transmission method applied to a terminal is characterized by comprising the following steps:

22. The information transmission method according to claim 21, wherein before sending the terminal history information of the terminal collected by the terminal to a second access network RAN node, the method further comprises:

23. The information transmission method according to claim 21 or 22, wherein the terminal history information includes at least one of the following information:

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

24. The information transmission method according to claim 23, wherein the cell history information of the connected cell comprises: and when the terminal is in a connection state, the cell identification and/or the access duration of the connected cell.

25. The information transmission method according to claim 23, wherein the cell history information of the cell in which the idle state resides includes: and the cell identification and/or the residence time length of the cell in which the terminal resides when the terminal is in an idle state.

26. The information transmission method according to claim 23, wherein the beam history information includes: the terminal comprises at least one of index information of a beam connected when the terminal is in a connected state, access duration corresponding to the beam connected when the terminal is in the connected state, index information of a beam where the terminal resides when the terminal is in an idle state, and residence duration corresponding to the beam where the terminal resides when the terminal is in the idle state.

27. A core network element comprising a memory, a processor, a transceiver, and a computer program stored on the memory and executable on the processor; wherein the processor implements the following steps when executing the program:

28. The network element of claim 27, wherein the processor, when executing the program, further performs the steps of:

29. The network element of claim 27, wherein the terminal history information comprises at least one of the following information:

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

30. The network element of claim 29, wherein the cell history information of the connected cell comprises: and when the terminal is in a connection state, the cell identification and/or the access duration of the connected cell.

31. The network element of claim 29, wherein the cell history information of the cell in which the idle state resides comprises: and the cell identification and/or the residence time length of the cell in which the terminal resides when the terminal is in an idle state.

32. The core network element of claim 29, wherein the beam history information comprises: the terminal comprises at least one of index information of a beam connected when the terminal is in a connected state, access duration corresponding to the beam connected when the terminal is in the connected state, index information of a beam where the terminal resides when the terminal is in an idle state, and residence duration corresponding to the beam where the terminal resides when the terminal is in the idle state.

33. A core network element according to claim 27 or 28, wherein the terminal history information is collected by the terminal or a second RAN node.

34. An access network node, a first RAN node, comprising a memory, a processor, a transceiver, and a computer program stored on the memory and executable on the processor; wherein the processor implements the following steps when executing the program:

35. The access network node of claim 34, wherein the terminal history information comprises at least one of:

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

36. The access network node of claim 35, wherein the cell history information for the connected cell comprises: and when the terminal is in a connection state, the cell identification and/or the access duration of the connected cell.

37. The access network node of claim 35, wherein the cell history information of the cell in which the idle state resides comprises: and the cell identification and/or the residence time length of the cell in which the terminal resides when the terminal is in an idle state.

38. The access network node of claim 35, wherein the beam history information comprises: the terminal comprises at least one of index information of a beam connected when the terminal is in a connected state, access duration corresponding to the beam connected when the terminal is in the connected state, index information of a beam where the terminal resides when the terminal is in an idle state, and residence duration corresponding to the beam where the terminal resides when the terminal is in the idle state.

39. The access network node of claim 34, wherein the terminal history information is collected by the terminal or a second RAN node.

40. An access network node, a second RAN node, comprising a memory, a processor, a transceiver, and a computer program stored on the memory and executable on the processor; wherein the processor implements the following steps when executing the program:

41. The access network node of claim 40, wherein the terminal history information comprises at least one of:

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

42. The access network node of claim 41, wherein the cell history information for the connected cell comprises: and when the terminal is in a connection state, the cell identification and/or the access duration of the connected cell.

43. The access network node of claim 41, wherein the cell history information for the cell in which the idle state resides comprises: and the cell identification and/or the residence time length of the cell in which the terminal resides when the terminal is in an idle state.

44. The access network node of claim 41, wherein the beam history information comprises: the terminal comprises at least one of index information of a beam connected when the terminal is in a connected state, access duration corresponding to the beam connected when the terminal is in the connected state, index information of a beam where the terminal resides when the terminal is in an idle state, and residence duration corresponding to the beam where the terminal resides when the terminal is in the idle state.

45. The access network node of claim 40, wherein the terminal history information is collected by the terminal or a second RAN node.

46. The access network node according to claim 40 or 45, wherein the processor when executing the program further performs the steps of:

47. A terminal comprising a memory, a processor, a transceiver, and a computer program stored on the memory and executable on the processor; wherein the processor implements the following steps when executing the program:

48. The terminal of claim 47, wherein the processor, when executing the program, further performs the steps of:

49. The terminal according to claim 47 or 48, wherein the terminal history information comprises at least one of the following information:

cell history information of a connected cell;

cell history information of a cell in which an idle state resides; and

beam history information;

50. The terminal of claim 49, wherein the cell history information of the connected cell comprises: and when the terminal is in a connection state, the cell identification and/or the access duration of the connected cell.

51. The terminal of claim 49, wherein the cell history information of the cell in which the idle state resides comprises: and the cell identification and/or the residence time length of the cell in which the terminal resides when the terminal is in an idle state.

52. The terminal of claim 49, wherein the beam history information comprises: the terminal comprises at least one of index information of a beam connected when the terminal is in a connected state, access duration corresponding to the beam connected when the terminal is in the connected state, index information of a beam where the terminal resides when the terminal is in an idle state, and residence duration corresponding to the beam where the terminal resides when the terminal is in the idle state.

53. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the steps of the information transmission method according to any one of claims 1 to 7; or

The program when executed by a processor implementing the steps of the information transmission method of any one of claims 8 to 13; or

The program when executed by a processor implementing the steps of the information transmission method of any one of claims 14 to 20; or

The program implementing the steps of the information transmission method according to any one of claims 21 to 26 when executed by a processor.

54. An information transmission apparatus applied to a core network element, comprising:

55. The information transmission apparatus of claim 54, further comprising:

56. An information transmission apparatus applied to a first access network (RAN) node, comprising:

57. An information transmission apparatus applied to a RAN node of a second access network, comprising:

58. The information transmission apparatus of claim 57, wherein the terminal history information is collected by the terminal or a second RAN node.

59. The information transmission apparatus according to claim 57 or 58, characterized by further comprising:

60. An information transmission apparatus applied to a terminal, comprising: