CN110913456B

CN110913456B - Core network type indication method and communication device

Info

Publication number: CN110913456B
Application number: CN201811082689.1A
Authority: CN
Inventors: 石小丽; 王瑞; 罗海燕; 王燕
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-09-17
Filing date: 2018-09-17
Publication date: 2021-02-12
Anticipated expiration: 2038-09-17
Also published as: WO2020057441A1; CN110913456A

Abstract

The embodiment of the invention provides a method and a communication device for indicating a core network type.

Description

Core network type indication method and communication device

Technical Field

The present invention relates to the field of communications, and in particular, to a method for indicating a core network type and a communications apparatus.

Background

Currently, in a Long Term Evolution (LTE) system, a Centralized Unit (CU) -Distributed Unit (DU) separation architecture is supported, that is, a base station supports one CU and multiple DUs; the CU includes a Radio Resource Control (RRC), a Packet Data Convergence Protocol (PDCP), and a Public Data Access Point (PDAP) protocol layer, and the DU includes a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a physical layer (PHY) layer.

The standard also supports a 5G core network in which an LTE base station can connect to a new radio access technology (NR), but how to select the core network in a CU-DU separation architecture in which the LTE base station is connected to both the LTE core network and the 5G core network has not been considered.

Disclosure of Invention

The invention provides an indication method and a communication device of a core network type, which realize the indication of the core network type in an NR CU-DU separation framework so as to further complete the selection of the core network.

In a first aspect, a method for indicating a core network type is provided, where the method includes:

the first network node sends a first message to the second network node, wherein the first message is used for indicating the core network types supported by the first network node and the second network node, and the core network type indication communication between the first network node and the second network node is realized.

In one possible implementation, the first network node comprises only a radio link control layer, a media access control layer and a physical layer; the second network node only comprises a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer; or,

the first network node only comprises a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer, and the second network node only comprises a radio link control layer, a media access control layer and a physical layer.

In one possible implementation, the first network node is a distributed unit DU and the second network node is a central unit CU; alternatively, the first network node is a CU and the second network node is a DU. And the indication of the core network type of interaction between the CU and the DU under the CU-DU framework is realized.

In a possible implementation, the first message comprises public land mobile network PLMN information and/or tracking area code TAC information of the core network type.

In another possible implementation, the first message comprises cell barring information of the core network type.

In one possible implementation, before the first network node sends the first message to the second network node, the method further comprises:

the first network node receives a second message, wherein the second message is used for determining the type of the core network;

the first network node determines the core network type according to the second message.

In a second aspect, a method for core network type indication is provided, where the method includes:

the second network node receives a first message sent by the first network node, wherein the first message is used for indicating the second network node and the core network type supported by the first network node, and the core network type indication communication between the first network node and the second network node is realized.

In one possible implementation, the second network node only comprises a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer, and the first network node only comprises a radio link control layer, a media access control layer and a physical layer; or,

the second network node only comprises a wireless link control layer, a media access control layer and a physical layer, and the first network node only comprises a wireless resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer.

In a third aspect, a method for indicating a core network type is provided, where the method includes:

the first network node sends a first message to the second network node, wherein the first message is used for indicating the core network type connected by the terminal at the third network node, and the core network type indication communication between the first network node and the second network node is realized.

In one possible implementation, the first network node comprises only a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer; the second network node comprises only a radio link control layer, a medium access control layer and a physical layer.

In one possible implementation the first network node is a concentration unit CU and the second network node is a distribution unit DU. And the indication of the core network type of interaction between the CU and the DU under the CU-DU framework is realized.

In one possible implementation, the method further comprises:

and the first network node receives a second message sent by the third network node, wherein the second message comprises the information of the core network type.

In one possible implementation of the invention, the method further comprises:

and the first network node receives a third message sent by the second network node, wherein the third message comprises switching configuration information, and the switching configuration information is generated by the second network node according to the type of a core network connected with the third network node by the terminal.

In a fourth aspect, a method for core network type indication is provided, where the method includes:

the second network node receives a first message sent by the first network node, wherein the first message is used for indicating the core network type connected by the terminal at the third network node, and the core network type indication communication between the first network node and the second network node is realized.

In one possible implementation, the second network node comprises only a radio link control layer, a media access control layer, and a physical layer; the first network node comprises only a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer.

In one possible implementation the second network node is a distributed unit DU and the first network node is a central unit CU. And the indication of the core network type of interaction between the CU and the DU under the CU-DU framework is realized.

In one implementation, the method further comprises:

the second network node generates switching configuration information according to the core network type connected with the terminal at the third network node;

the second network node sends a third message to the first network node, the third message including the handover configuration information, so that the first network node sends the handover configuration information to the third network node.

In a fifth aspect, a communication apparatus is provided, which includes:

and the sending unit is used for sending a first message to the second network node, wherein the first message is used for indicating the core network types supported by the communication device and the second network node, and the core network type indication communication between the communication device and the second network node is realized.

In one possible implementation, the communication device includes only a radio link control layer, a medium access control layer, and a physical layer; the second network node only comprises a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer; or,

the communication device only comprises a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer, and the second network node only comprises a radio link control layer, a media access control layer and a physical layer.

In one possible implementation, the communication means are distributed units DU, the second network node is a central unit CU; alternatively, the communication device is a CU and the second network node is a DU. And the indication of the core network type of interaction between the CU and the DU under the CU-DU framework is realized.

In one possible implementation, the communication device further comprises a receiving unit and a processing unit;

a receiving unit, configured to receive a second message, where the second message is used to determine a core network type;

and the processing unit is used for determining the type of the core network according to the second message.

In a sixth aspect, a communication apparatus is provided, which includes:

the receiving unit is used for receiving a first message sent by the first network node, wherein the first message is used for indicating the communication device and the core network type supported by the first network node, and the core network type indication communication between the first network node and the communication device is realized.

In one possible implementation, the communication device only comprises a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer, and the first network node only comprises a radio link control layer, a media access control layer and a physical layer; or,

the communication device only comprises a wireless link control layer, a media access control layer and a physical layer, and the first network node only comprises a wireless resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer.

In one possible implementation, the first network node is a distributed unit DU and the communication means is a central unit CU; alternatively, the first network node is a CU and the communication means is a DU. And the indication of the core network type of interaction between the CU and the DU under the CU-DU framework is realized.

In a seventh aspect, a communication apparatus is provided, which includes:

and the sending unit is used for sending a first message to the second network node, wherein the first message is used for indicating the core network type connected by the terminal at the third network node, so that the core network type indication communication between the communication device and the second network node is realized.

In one possible implementation, the communication device only comprises a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer; the second network node comprises only a radio link control layer, a medium access control layer and a physical layer.

In one possible implementation the communication means is a central unit CU and the second network node is a distributed unit DU. And the indication of the core network type of interaction between the CU and the DU under the CU-DU framework is realized.

In one possible implementation, the communication apparatus further includes a receiving unit, configured to receive a second message sent by a third network node, where the second message includes information of a core network type.

In a possible implementation of the present invention, the receiving unit is further configured to receive a third message sent by the second network node, where the third message includes handover configuration information, and the handover configuration information is generated by the second network node according to a core network type connected to the third network node by the terminal.

In an eighth aspect, there is provided a communication apparatus comprising:

and the receiving unit is used for receiving a first message sent by the first network node, wherein the first message is used for indicating the core network type connected by the terminal at the third network node, and the core network type indication communication between the first network node and the communication device is realized.

In one possible implementation, the communication device includes only a radio link control layer, a medium access control layer, and a physical layer; the first network node comprises only a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer.

In one possible implementation the communication means are distributed units DU and the first network node is a central unit CU. And the indication of the core network type of interaction between the CU and the DU under the CU-DU framework is realized.

In one implementation, the communication device further includes a processing unit and a transmitting unit;

the processing unit is configured to generate handover configuration information according to a core network type connected to the terminal at the third network node;

the sending unit is configured to send a third message to the first network node, where the third message includes the handover configuration information, so that the first network node sends the handover configuration information to the third network node.

In a ninth aspect, a communications apparatus is provided, which includes a processor coupled to a memory, configured to read and execute instructions from the memory to:

and sending a first message to the second network node, wherein the first message is used for indicating the core network types supported by the communication device and the second network node.

In one possible implementation, the communication means are distributed units DU, the second network node is a central unit CU; alternatively, the communication device is a CU and the second network node is a DU.

In another possible implementation, the first message comprises at least one of core network type public land mobile network PLMN information and tracking area code TAC information.

In another possible implementation, the first message contains cell barring information of the core network type.

In one possible implementation, the processor is further configured to read and execute instructions in the memory to implement:

receiving a second message, wherein the second message is used for determining the type of the core network;

and determining the core network type according to the second message.

Optionally, in one possible implementation, the communication device further comprises a memory.

In a tenth aspect, a communications apparatus is provided that includes a processor coupled to a memory and configured to read and execute instructions from the memory to implement:

and receiving a first message sent by the first network node, wherein the first message is used for indicating the core network types supported by the communication device and the first network node.

In one possible implementation, the communication means are distributed units DU, the first network node is a central unit CU; alternatively, the communication device is a CU and the first network node is a DU.

In one possible implementation, the communication device further includes a memory.

In an eleventh aspect, a communications apparatus is provided that includes a processor coupled to a memory and configured to read and execute instructions from the memory to implement:

and sending a first message to the second network node, wherein the first message is used for indicating the core network type connected with the terminal at the third network node.

In one possible implementation the communication means is a central unit CU and the second network node is a distributed unit DU.

and receiving a second message sent by the third network node, wherein the second message comprises the information of the core network type.

and receiving a third message sent by the second network node, wherein the third message comprises switching configuration information, and the switching configuration information is generated by the second network node according to the type of a core network connected with the third network node by the terminal.

In a twelfth aspect, a communications apparatus is provided that includes a processor coupled to a memory and configured to read and execute instructions from the memory to implement:

and receiving a first message sent by the first network node, wherein the first message is used for indicating the type of a core network connected with the terminal at the third network node.

In one possible implementation the communication means are distributed units DU and the first network node is a central unit CU.

generating switching configuration information according to the type of a core network connected with the terminal at the third network node;

and sending a third message to the first network node, wherein the third message comprises the switching configuration information, so that the first network node sends the switching configuration information to the third network node.

In a thirteenth aspect, there is provided a system comprising the communication apparatus of any possible implementation of the ninth aspect or the ninth aspect, and the communication apparatus of any possible implementation of the tenth aspect or the tenth aspect; alternatively, the system comprises the communication device of any possible implementation of the eleventh aspect or the eleventh aspect, and the communication device of any possible implementation of the twelfth aspect or the second aspect.

In a fourteenth aspect, a computer readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements the method of any one or more of the first to fourth aspects. The method of (1).

In a fifteenth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any one or more of the first to fourth aspects described above.

Based on the provided core network type indication method and communication device, the type of the core network is indicated through information sent between the first network node and the second network node, so that the first network node and the second network node can select the core network according to the indicated core network type.

Drawings

FIG. 1 is a system architecture diagram according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a control plane protocol stack according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a user plane protocol stack according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a CU-DU architecture of an ng-eNB according to an embodiment of the present invention;

fig. 5(a) and fig. 5(b) are schematic diagrams of an MCG split bearer option under an MR-DC architecture according to an embodiment of the present invention;

fig. 6(a) and fig. 6(b) are schematic diagrams of an SCG bearer selection under an MR-DC architecture according to an embodiment of the present invention;

fig. 7 is a schematic diagram of an SCG split bearer selection under an MR-DC architecture according to an embodiment of the present invention;

fig. 8 is a schematic diagram of functional partitioning between CUs of an ng-eNB and DUs of the ng-eNB according to an embodiment of the present invention;

fig. 9 is a flowchart of a method for indicating a core network type according to an embodiment of the present invention;

fig. 10 is a flowchart illustrating another core network type indication method according to an embodiment of the present invention;

fig. 11 is a flowchart illustrating another core network type indication method according to an embodiment of the present invention;

fig. 12 is a flowchart illustrating a method for indicating a core network type according to another embodiment of the present invention;

fig. 13 is a schematic structural diagram of a communication device according to an embodiment of the present invention;

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

fig. 15 is a schematic structural diagram of a communication device according to an embodiment of the present invention;

fig. 16 is a schematic structural diagram of another communication device according to an embodiment of the present invention.

Detailed Description

A system architecture of a 5G core network (core network) that can support an LTE base station to connect to an NR is shown in fig. 1, where the 5G core network may be referred to as a 5GC for short. The system shown in fig. 1 may be referred to as eLTE or NG-LTE, and may also be directly referred to as LTE connected to 5GC, or E-UTRAN connected to 5GC, or LTE/5 GC. An LTE base station supporting connection to 5GC is called ng-eNB.

The 5GC includes an Access Management Function (AMF), a Session Management Function (SMF), and a User Plane Management Function (UPF). The function of the AMF is similar to that of the MME in LTE; the functions of the UPF and SMF are close to those of the SGW + PGW in LTE. The NG-eNB and the gNB communicate with each other through an interface Xn, and the NG-eNB, the gNB and AMF and UPF in the 5GC communicate through an interface NG, as shown in figure 1.

Under this system, the corresponding control plane protocol stack is shown in fig. 2, and the corresponding user plane protocol stack is shown in fig. 3. In fig. 2, a Packet Data Convergence Protocol (PDCP) may employ a PDCP of E-UTRT or a PDCP of NR. In fig. 3, PDCP employs NR PDCP.

Fig. 4 is a schematic diagram of a CU-DU architecture of an ng-eNB according to an embodiment of the present invention, and fig. 4 is a schematic diagram of a basic CU-DU architecture of the ng-eNB. The CU-DU architecture of the ng-eNB may also be a scenario as shown in fig. 5(a), fig. 5(b), fig. 6(a), fig. 6(b), and fig. 7. Fig. 5(a) and 5(b) are schematic diagrams of an architecture of Master Cell Group (MCG) split bearer selection under an MR-DC architecture, respectively; fig. 6(a) and fig. 6(b) are schematic diagrams of an architecture for Secondary Cell Group (SCG) bearer selection under an MR-DC architecture, respectively; FIG. 7 is a schematic diagram of an SCG split bearer selection under the MR-DC architecture. The MR-DC framework is that the ng-eNB is used as a main base station to support a CU-DU separation framework, and the gNB is used as an auxiliary base station to be used for multi-stream convergence transmission.

In the ng-eNB, the protocol layer is divided between PDCP and Radio Link Control (RLC) layers, as shown in fig. 8, that is, a CU of the ng-eNB has Radio Resource Control (RRC) or partial RRC control function, and includes all or part of the protocol layer functions of the existing base station; for example, the RRC layer may include only an RRC function or a part of the RRC function, or include an RRC function or a Service Data Adaptation Protocol (SDAP) layer function, or include an RRC/Packet Data Convergence Protocol (PDCP) layer function, or include an RRC/PDCP and a part of the RLC layer function; or include an RRC/PDCP/Media Access Control (MAC) layer, even a part or all of the PHY function, without excluding any other possibility, the DU of the ng-eNB has all or part of the protocol layer functions of the existing base station, i.e., a part of the protocol layer function unit of the RRC/SDAP/PDCP/RLC/MAC/PHY, for example, includes part of the RRC function and the protocol layer functions of PDCP/RLC/MAC/PHY, or includes the protocol layer functions of RLC/MAC/PHY, or includes part of the RLC/MAC/PHY function, or only includes all or part of the PHY function; it should be noted that the functionality of the various protocol layers mentioned herein may vary and are within the scope of the present application. FIG. 8 is a schematic diagram of the segmentation of the CU function of the ng-eNB and the DU function of the ng-eNB.

Based on eLTE, the embodiment of the invention provides a method for indicating a core network type and a communication device, which are suitable for a CU-DU framework of an ng-eNB.

In the embodiment of the present invention, the Core network type information of the base station may refer to an Evolved Packet Core (EPC) only supporting connection to LTE, an EPC only supporting connection to a 5G Core (5GC), and an EPC and 5GC simultaneously supporting connection, that is, the base station only supports connection to the EPC, or only supports connection to the 5GC, or the base station supports connection to the EPC and 5GC simultaneously.

Each PLMN may support one of three core network types, i.e. each PLMN may support only connection EPC, or only connection 5GC, or both connection EPC and 5 GC.

The TAC values corresponding to different core network types are different, namely, the TAC of the EPC exists in a cell under the EPC; TAC of 5GC for the cell under 5 GC; wherein there may also be different TACs for each PLMN of a cell under 5 GC.

The cells under different core network types have different cell barred (cell barred) information, that is, the cell barred information of the EPC exists for the cell under the EPC, and the cell barred information of the 5GC for the cell under the 5 GC.

The following describes a method for indicating a core network type according to an embodiment of the present invention with reference to the accompanying drawings. It should be noted that, in the embodiment of the present invention, the "first", "second", and "third" are only for distinguishing the network node and the message, and do not limit the network node and the message itself.

Fig. 9 is a flowchart of a method for indicating a core network type according to an embodiment of the present invention. As shown in fig. 9, the method may include the steps of:

s110, the first network node sends a first message to the second network node.

The first message is used for indicating the core network types supported by the first network node and the second network node. Here, "supported" may also be understood as "supported connection", wherein "supported connection" may refer to a direct connection of the first network node or the second network node to the core network, or may refer to an indirect connection of the first network node or the second network node to the core network via other elements.

Specifically, the first message is used to indicate a core network type supported by network configuration information, where the network configuration information may be at least one of PLMN, TAC, cell barring information, and the like.

Optionally, in one embodiment, the first network node comprises only at least one of a radio link layer control, RLC, protocol layer, a medium access control, MAC, layer and a physical PHY layer; the second network node only comprises at least one of a Radio Resource Control (RRC) protocol layer, a service data adaptation layer (SDAP) and a Packet Data Convergence (PDCP) protocol layer; or,

the first network node comprises at least one of a RRC protocol layer, a service data adaptation layer, SDAP, and a PDCP protocol layer only, and the second network node comprises at least one of a RLC protocol layer, a MAC layer, and a PHY layer only.

Optionally, in one embodiment, the first network node is a DU and the second network node is a CU; alternatively, the first network node is a CU and the second network node is a DU. The DU and CU send the first message over the interface between them, which may be referred to as the W1 interface. The W1 interface may be an existing W1 interface or a newly defined W1 interface. In the embodiment of the present invention, if the W1 interface is a newly defined interface, the W1 interface may also have other names, and the name of the newly defined interface is not limited in the embodiment of the present invention.

Before describing the core network type indication of the interaction between the first network node and the second network node, we first understand some conclusions that are proposed in the discussion of the lte:

1. a new Public Land Mobile Network (PLMN) list is introduced for the 5GC, and the newly introduced PLMN list includes at least one PLMN that can be connected to the 5 GC.

2. The method provides a function of cell forbidden identification for the UE with 5GC-NAS, and introduces a new cell forbidden identification, such as 'cell forbidden-5 GC'. In the case that all PLMNs can connect only to 5 GCs, the newly introduced cell barring identity may be used to identify the 5 GCs to which the cell is barred from accessing. And for the UE which has the capability of accessing the EPC in the EPC-NAS, the condition that the cell is forbidden to access can be ignored. The cell barring identity may be included in a system information block 1 (SIB 1).

3. A Tracking Area Code (TAC) field for 5GC is newly introduced, which may be a 3-byte field, distinguished from a TAC field for EPC, which is a 2-byte field.

And the PLMN of 5GC may broadcast separate TACs, i.e. the eNB may broadcast two TACs for each PLMN connected to EPC and 5GC, one for E-UTRA connected to EPC and one for E-UTRA connected to 5 GC. This situation applies to Radio Access Network (RAN) sharing situations and non-RAN sharing situations.

Based on some conclusions presented in the above lte discussion, optionally, in an embodiment of the present invention, at least one of PLMN information and TAC information of the core network type may be included in the first message. In the embodiment of the present invention, the following form may exist for the core network type indication interacted between CU-DUs when the UE connects to different core networks, such as EPC and/or 5 GC:

1. explicitly indicating a core network type, for example, a CU and a DU send a first message through a W1 interface, where the first message includes at least one of PLMN information and TAC information, and the first message also includes a core network type information CN type, and the CN type is used to indicate which core network the PLMN or TAC supports; optionally, the TAC information may be an implicit indication, that is, the TAC includes two TACs, one is an EPC TAC, and the other is a 5GC TAC; optionally, the PLMN may also be an implicit indication, that is, the PLMN includes two PLMNs, one PLMN is EPC, and the other PLMN is 5 GC. Optionally, the PLMN information in the first message may include TAC information, or the TAC information and PLMN information may exist independently as separate information elements. Specific cells are, for example: the first message includes information CN type explicitly indicating the core network type, as shown in example 1, example 2, example 3, example 4, and example 5. The PLMN information may also be referred to as a PLMN information element, and the specific form of the PLMN information may be a PLMN list.

Example 1

IE/group name (group name)	Status of state
		CGI	M
PCI	M
		Broadcast PLMNs (broadcast PLMNs)	M
>PLMN identification	M
		>CN type
>TAC information
		>>TAC-EPC	M
>>TAC-5GC	O

Example 2

Example 3

IE/group name (group name)	Status of state
		CGI	M
PCI	M
		Broadcast PLMNs (broadcast PLMNs)	M
>PLMN identification	M
		>CN type
TAC information
		>TAC-EPC	M
>TAC-5GC	O

Example 4

IE/group name (group name)	Status of state
		CGI	M
PCI	M
		Broadcast PLMNs (broadcast PLMNs)	M
>PLMN identification	M
		>TAC information	M
>CN type	O

Example 5

IE/group name (group name)	Status of state
		CGI	M
PCI	M
		Broadcast PLMNs (broadcast PLMNs)	M
>PLMN identification	M
		>CN type
TAC information
		>TAC	M
>CN type

It should be noted that, the meaning of the state in the above table is that M means a necessary option, and O means an optional option, M and O in the above table are only an example, and actually, the cell in the above table may be M or O, which is not limited in the present invention.

2. Implicitly indicates the core network type, for example, CU and DU send a first message through W1 interface, where the first message includes two pieces of PLMN information, and the two pieces of PLMN information respectively indicate PLMN information supporting EPC and PLMN information supporting 5GC, as shown in example 6 and example 7. The core network type is implicitly indicated by the two PLMN information.

Example 6

IE/group name (group name)	Status of state
		CGI	M
PCI	M
		Broadcast PLMNs (broadcast PLMNs) -EPC
>PLMN identification	M
		>TAC-EPC	M
Broadcast PLMNs (broadcast PLMNs) -5GC	O
		>PLMN identification	M
>TAC-5GC	M

Example 7

IE/group name (group name)	Status of state
		CGI	M
PCI	M
		TAC information
>TAC-EPC	M
		>TAC-5GC	O
Broadcast PLMNs (broadcast PLMNs)
		>PLMN identification	M
Broadcast PLMNs (broadcast PLMNs) -5GC	O
		>PLMN identification	M

The first message includes PLMN information and/or TAC information of each cell. Each Cell is identified by a Cell identity, which may be identified by a global identity (CGI) and a Physical Cell Identifier (PCI).

In one embodiment of the present invention, the PLMN information may further include TAC information, as shown in example 1 and example 4. In example 1, the TAC information may include an implicit or displayed indication, and specifically, the implicit indication may include TAC information TAC-EPC for identifying EPC-capable TAC and TAC information TAC-5GC for identifying 5 GC-capable TAC, respectively. For example, if the TAC of the cell is TAC-5GC, the target node may know that the cell supports 5GC after receiving the first message; if the TAC of the cell is the TAC-EPC, the target node can know that the cell supports 5GC after receiving the first message. If the TAC indication of the cell is TAC-EPC and TAC-5GC, the target node can know that the cell supports both 5GC and EPC after receiving the first message. Alternatively, in one embodiment of the present invention, the TAC-EPC and the TAC-5GC may be distinguished by bytes. TAC-EPC is 2 bytes, and TAC-5GC is 3 bytes.

In the embodiment of the present invention, the PLMN information and the TAC information may also be respectively and independently included in the first message directly as an information element, as shown in example 2, example 3, and example 5. It should be noted that the PLMN and the TAC may be implicitly indicated or may be displayed, respectively.

Examples 6 and 7 are implicit indication of core network type by two PLMN information. One PLMN information indicates support of EPC, and the other PLMN information indicates support of 5 GC. In example 6, PLMN identification and TAC information may be included in each PLMN information. Optionally, in an embodiment, when the PLMN information and the TAC information of the cell are used to indicate that the supported core network type is EPC, the PLMN information of the EPC is included in the first message.

Optionally, in another embodiment, when the PLMN information and the TAC information of the cell are used to indicate that the supported core network type is 5GC, the first message includes PLMN information of 5 GC.

Optionally, in another embodiment, when the PLMN information and the TAC information of the cell are used to indicate that the supported core network types are EPC and 5GC, the first message includes PLMN information of EPC and PLMN information of 5 GC.

In example 7, the PLMN information and the TAC information are separately contained in the first message. The first message may include two TAC information and two PLMN information for indicating that the supported core network types are EPC and 5GC, respectively.

Optionally, in an embodiment of the present invention, the first message may further include information supported by slicing, and optionally, the information supported by slicing may be included in PLMN information.

Optionally, in an embodiment of the present invention, the TAC information in the first message may also be of PLMN granularity, that is, each PLMN has a different TAC-EPC for a cell supporting EPC, and each PLMN has a different TAC-5GC for a cell supporting 5 GC.

Optionally, in this embodiment of the present invention, when the first message includes PLMN information and/or TAC information, the first message may be a W1 interface establishment request message, or a W1 interface establishment response message, or a W1 interface configuration update message, or a W1 interface configuration update response message, or the like.

Optionally, in an embodiment of the present invention, the first message may further include cell barred (cell barred) information in addition to the PLMN and/or TAC information, so as to indicate a core network type of the cell barred information. Specific forms of the cell barring information can be referred to the descriptions of example 12, example 13, and example 14. Certainly, the first message may not include the cell barring information, and when the second network node receives the first message, the core network type of the indicated connection may be determined according to the PLMN information and/or the TAC information in the first message, so as to determine the core network type of the cell barring information.

Optionally, in an embodiment of the present invention, the first message may include cell barred (cell barred) information of the core network type, so as to indicate the core network type of the cell barred information.

That is, the cell barring information may be included in the first message together with the PLMN information and/or the TAC information, may be included in the first message alone, or may be included in a new message, which is not limited herein.

And the selection of the core network type is realized by adopting an explicit indication or an implicit indication of interaction between the CU and the DU.

Optionally, as shown in fig. 9, before the first network node sends the first message to the second network node, the method may further include:

s120, the first network node receives the second message.

The first network node receives the second message sent by the management node, where the management node may be an operation, administration and maintenance (OAM) network manager or other centralized management node, which is not limited in this embodiment of the present invention.

The management node configures PLMN information, TAC information, and core network type (CN type) information for the first network node, and sends the configured PLMN information, TAC information, and core network type information to the first network node through the second message, optionally, may also send through other existing messages or new messages, which is not limited herein. It should be noted that the core network type information may be a display indication, or may also be an implicit indication, such as the display indication manner shown in fig. 8 and example 9, for example, the implicit indication manner shown in example 10 and example 11.

Example 8

IE/group name (group name)	Status of state
		CGI	M
PCI	M
		TAC information	M
Broadcast PLMNs (broadcast PLMNs)
		>PLMN identification	M
>CN type

Example 9

IE/group name (group name)	Status of state
		CGI	M
PCI	M
		Broadcast PLMNs (broadcast PLMNs)
>PLMN identification
		>TAC information	M
>CN type

Example 10

IE/group name (group name)	Status of state
		CGI	M
PCI	M
		TAC-EPC	M
Broadcast PLMNs (broadcast PLMNs) -EPC
		>PLMN identification	M
TAC-5GC
		Broadcast PLMNs (broadcast PLMNs) -5GC
>PLMN identification

Example 11

IE/group name (group name)	Status of state
		CGI	M
PCI	M
		Broadcast PLMNs (broadcast PLMNs) -EPC
>PLMN identification
		>TAC information
Broadcast PLMNs (broadcast PLMNs) -5GC	O
		>PLMN identification
>TAC information

As shown in example 8, the second message includes a cell identity CGI, a PCI, and TAC information and PLMN information, where the PLMN information includes a PLMN identity and core network type information.

As shown in example 9, the second message includes a cell identity CGI, a PCI, and PLMN information, wherein the PLMN information includes a PLMN identity and TAC information and core network type (CN type) information.

As shown in example 10, the second message includes cell CGI, PCI, two pieces of PLMN information and two pieces of TAC information, where one piece of PLMN information is used to identify a PLMN of EPC and the other piece of PLMN information is used to identify a PLMN of 5 GC; one TAC information is used to identify a TAC of the EPC, and the other TAC information is used to identify a TAC of 5 GC.

As shown in example 11, the second message includes cell CGI, PCI, and two PLMN information, wherein the PLMN information includes TAC information.

Optionally, in this embodiment of the present invention, if the first network node is a DU and the second network node is a CU, after receiving PLMN information, TAC information, and CN type configured by the management node, the DU determines each PLMN corresponding to each cell and a core network type to which the TAC indicates to connect. And further sends a first message to the CU through the W1 interface, and the core network type of the information is indicated in the first message explicitly or implicitly. And interaction of the PLMN information and the core network type indication of the TAC information between the DU and the CU is realized.

In addition, after receiving the information configured by the management node, the DU may also explicitly or implicitly indicate a core network type in a broadcast message when broadcasting the message to the terminal, so as to indicate the core network type to which the UE can connect. The manner of explicitly or implicitly indicating the core network type in the broadcast message is the same as the manner of explicitly or implicitly indicating the core network type in S110, and is not described herein again for brevity.

In one embodiment, if the first network node is a CU and the second network node is a DU, the CU may determine the core network types supported by each cell after receiving the PLMN information, the TAC information, and the CN type configured by the management node. In order to make the DU know the type of the core network supported by each cell, the CU sends a first message to the DU through the W1 interface and explicitly or implicitly indicates the core network type in the first message, thereby implementing the interaction of the core network type indication of the PLMN information and the TAC information between the CU and the DU.

No matter whether the CU acquires PLMN information, TAC information, and core network type information corresponding thereto from the management node or the DU, the CU can determine the core network type supported by each cell after acquiring these pieces of information, and can correctly execute the following procedures:

for example, paging (paging), when a CU receives a paging message from a core network, the CU determines a core network type according to paging identification information (UE paging identity) in the paging message, so as to fill paging information corresponding to the core network type in the paging message sent by the CU to a DU, where, for EPC paging, the UE paging identity is S-TMSI; for 5GC paging, the UE paging identity is 5G-S-TMSI. When the CU cannot determine the core network type according to the paging identifier, the CU determines the core network type according to the TAI in the paging message and the corresponding relation between the PLMN information, the TAC information and the corresponding core network type information which are acquired by the CU, and then fills the paging information corresponding to the core network type in the paging message sent to the DU by the CU to complete paging.

For another example, a handover restriction list (handover restriction list): after the CU receives the handover restriction information (or referred to as a handover restriction list) sent by the core network, the CU determines which PLMNs and/or TACs to restrict to which core networks to use respectively according to the stored PLMN information, TAC information, and corresponding core network type information, so that the flows of handover and the like can be executed correctly.

For another example, the interface of the core network is established: after the CU receives the PLMN information and the TAC information sent by the DU, the CU establishes an interface with a core network, and in the process of establishing the interface, the CU sends the PLMN information and the TAC information which support each core network type to the corresponding core network, for example, when the interface is established with the EPC, the PLMN information and the TAC information which support the EPC are sent to the EPC; or when an interface is established with the 5GC, the PLMN information and TAC information supporting the 5GC are transmitted to the 5 GC. The establishment process of the interface between the CU and the core network is realized.

In the embodiment of the present invention, after acquiring the PLMN information, the TAC information, and the corresponding core network type information, the DU may determine the core network supported by the cell, so as to correctly send a broadcast message to the UE, and indicate the information of the core network to which the cell corresponding to the UE can connect.

The method for indicating the core network type solves the problem that the core network type corresponding to PLMN and TAC related to the cell indicates in the interaction process between the CU and the DU, so that the DU can correctly broadcast the message to the UE, and the CU can correctly execute the processes of paging, switching limitation, interface establishment and the like.

For the cell barring information, whether to perform cell barring access may be determined by the CU or the DU. If the CU determines whether to perform cell barring access, in one embodiment, the CU may determine whether to perform cell barring access according to the neighboring cell information. Of course, the CU may also determine whether to perform cell barring access by using other existing or new technical methods, which is not limited in the embodiment of the present invention.

An embodiment of the present invention further provides a method for indicating a core network type, as shown in fig. 10, fig. 10 is a schematic flow chart of another method for indicating a core network type according to an embodiment of the present invention. As shown in fig. 10, the method may include the steps of:

210, the CU sends a first message to the DU, where the first message includes cell barring information.

After the CU determines the cell barring information of each core network, the CU sends a first message to the DU through a W1 interface, wherein the first message contains the cell barring information, and the cell barring information is used for indicating the type of the core network, namely the cell barring information comprises the type of the core network which prohibits the terminal from accessing the cell and is supported and connected by the cell.

It should be noted that the cell barring information may be core network-sized, that is, there is cell barring information of EPC for a cell under EPC, and there is cell barring information of 5GC for a cell of 5 GC. Alternatively, the cell barring information may also be PLMN-granular, that is, the cell barring information of the PLMN1 having an EPC for a cell under the EPC, the cell barring information of the PLMN2, and the like. It should be noted that the cell barring information is cell barring information used to indicate whether the UE can access a cell, for example, the cell barring information of a certain cell is cell barring information of 5GC, and if the UE desires to access the 5GC, the UE cannot access the 5GC through the cell.

In the embodiment of the present invention, the core network type of the cell barring information may be explicitly or implicitly indicated. For example: explicitly indicating the core network type of the cell barring information by including a core network type in the first message; the type of the core network is implicitly indicated by the first message including two pieces of cell barring information, wherein the two pieces of cell barring information are cell barring information of two different core networks respectively. The specific form of the cell barring information may be a list.

The core network type display indication manner of the cell barring information is as shown in example 12 and example 13. In example 12, the cell barring list comprises core network type (CN type) information, a cell identification (CGI) list, and cell barring information. Wherein, the cell identification (CGI) list comprises a cell identification of a cell for accessing the EPC and a cell identification of a cell for accessing the 5GC, and corresponding CGI information is selected according to the indication of the CN type. The cell barring information comprises EPC or 5GC core network type cell barring information, and corresponding cell barring information is selected according to the indication of CN type. In example 12, the cell barring information is the cell barring information of the EPC, and the terminal is barred from accessing the core network with the core network type of the EPC through the cell.

Example 12

Example 13

IE/group name (group name)	Status of state
		Cell barred list (cell barred list)
>Cell barred list entry (cell barred list item)
		>>CN type	M
>>CGI	M
		>>Cell forbidden information (cell barred info)	M

In implementation 13, the first message includes a cell barring list, the cell barring list including core network type (CN type) information, a cell identification CGI, and cell barring information. In example 13, the cell identifier CGI and the cell barring information indicate which type of core network the terminal is barred from accessing through which cells, through the core network type information in the cell barring list. Assuming that the core network type information included in the cell barring list in example 13 is EPC, the cell identifier CGI is cell 1, and the cell barring information indicates information for barring access of the terminal, then this example prohibits the terminal from accessing the EPC network through cell 1.

The implicit indication of the core network type of the cell barring information is shown in example 14. Example 14 includes two cell barring information, one of the two cell barring lists being used for cell barring information indicating that the core network type is EPC, and the other cell barring list being used for cell barring information indicating that the core network type is 5 GC.

Optionally, in this embodiment of the present invention, the cell barring information may be of an ENUMERATED type, such as estimated { barred, notgarred }.

Example 14

IE/group name (group name)	Status of state
		Cell barred list	M
>CGI	M
		>Cell forbidden information (cell barred)	M
Cell barred list-5 GC	O
		>NR-CGI	M
>Cell barring information-5 GC	M

Optionally, in this embodiment of the present invention, the first message may be a DU configuration update message, a DU configuration update response message, a CU configuration update response message, a W1 interface establishment request/response message, a bearer content setting/modification request/response (e.g., bearer content setup/modification request/response) message, a bearer content modification request/confirmation (e.g., bearer content modification request/confirmation) message, or other messages.

Optionally, in an embodiment of the present invention, as shown in fig. 10, the method may further include:

s220, the DU sends a change message to the CU, wherein the change message comprises changed cell barring information.

After the DU receives the first message sent by the CU, the DU determines whether to change the cell barring information according to the current load or other information, for example, the cell barring information in the first message received by the DU indicates that the terminal is prohibited from accessing the core network with the core network type EPC, after the DU determines according to various required information, the terminal is also prohibited from accessing the core network with the core network type 5GC, and then the DU changes the cell barring information and sends the changed cell barring information to the CU through the W1 interface.

s230, the CU sends a confirmation message to the DU.

After receiving the change message sent by the DU, the CU further determines whether the cell barring information needs to be changed again or not through the CU, and sends a determination message to the DU to determine the cell barring information.

The cell barring information may also be determined by a DU, and a method for indicating the core network type of the cell barring information determined by the DU is shown in fig. 11, and the method may include the following steps:

s310, the DU sends a first message to the CU, and the first message comprises cell barring information.

In the embodiment of the present invention, the DU may determine the cell barring information by an existing or newly created method, which is not limited in the embodiment of the present invention. And after the DU determines the cell barring information, sending a first message to the CU through a W1 interface, wherein the first message comprises the cell barring information, and the cell barring information is used for indicating which type of core network the terminal is prohibited to access through the cell. In this embodiment of the present invention, the cell barring information may explicitly or implicitly indicate a core network type of the core network to which access is barred, and a manner of explicitly or implicitly indicating the core network type is the same as that shown in examples 12, 13, and 14, and is not described herein again for brevity.

Optionally, in an embodiment of the present invention, as shown in fig. 11, the method further includes:

s320, the CU sends an update message to the DU.

Specifically, after the CU receives the cell barring information, it may further decide whether the cell barring information needs to be updated. For example, the core network type of the cell barring information received by the CU is EPC, and the core network type of the cell barring information is DU determined according to the case that the PLMN supports only 5 GC. After receiving the cell barring information sent by the DU, the CU further determines whether to perform cell barring on the 5GC as well. If it is determined that the cell barring is also performed for the 5GC, the CU may update the cell barring information and transmit the updated cell barring information to the DU.

Optionally, in another embodiment of the present invention, when the DU does not send the core network type of the cell barring information to the CU, the CU may also determine the core network type of the cell barring information according to the obtained PLMN information, specifically, the CU determines the core network type of the cell barring information according to the core network type indicated in the PLMN information, for example, the PLMN only supports access 5GC, and then may determine that the core network type of the cell barring information is EPC.

The embodiment of the invention also provides a method for indicating the type of the core network, and as shown in fig. 12, the method is applied to a scenario of base station switching under the CU-DU framework. As shown in fig. 12, the method may include the steps of:

s410, the first network node sends a first message to the second network node.

The first message is used to indicate a core network type to which the terminal is connected at the third network node.

Optionally, in an embodiment of the present invention, the first network node only includes a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer; the second network node comprises only a radio link control layer, a medium access control layer and a physical layer.

Optionally, in an embodiment of the invention, the first network node is a CU and the second network node is a DU.

In the embodiment of the present invention, the CU and the DU are two network nodes of the target base station. The third network node is a source base station. In a scenario that a terminal performs base station switching, when a CU of a target base station receives a switching request message sent by a source base station, the CU sends a first message to a DU through a W1 interface, where the switching request message includes information of a core network type connected to the source base station by the terminal, and the first message is used to indicate the core network type connected to the source base station by the terminal. So that the second network node generates the handover configuration information according to the core network type of the terminal indicated by the first message, where the third network node is connected.

In this embodiment of the present invention, the first message sent by the CU to the DU may explicitly or implicitly indicate a core network type connected by the terminal at the source base station. The explicit indication indicates a core network type connected to the source base station by the terminal, and may specifically be that the first message includes information of the core network type connected to the source base station by the terminal.

The specific way of implicitly indicating the core network type connected by the terminal at the source base station may be: the core network type supported by the terminal at the source base station is indicated, for example, by quality of service (QoS) information. Where different types of core networks use different QoS information, as shown in example 11:

selecting QOS information	M
		>E-UTRAN QoS	M
>DRB information
		>>DRB QoS	M
>>Flow Qos	M

Wherein, the E-UTRAN QoS in the table refers to the QoS used when the target CU is connected with the EPC; the DRB information refers to QoS used when the target CU connects to the 5 GC. And implicitly indicating the core network type connected with the terminal at the source base station through the QoS of different core network types.

Optionally, in this embodiment of the present invention, as shown in fig. 12, before the first network node sends the first message to the second network node, the method may further include:

s420, the first network node receives the second message.

The second message is sent by the third network node to the first network node. Optionally, in this embodiment of the present invention, the third network node is a source base station. The second message comprises information of the type of core network to which the terminal is connected at the third network node.

Optionally, in an embodiment of the present invention, as shown in fig. 12, the method further includes:

s430, the second network node sends a third message to the first network node.

When the second network node receives the first message sent by the first network node, the second network node generates switching configuration information according to the type of the core network connected with the third network node by the terminal indicated by the first message, and sends the switching configuration information to the first network node in the third message.

Optionally, the first network node is a CU, the second network node is a DU, and after receiving the first message sent by the CU, the DU generates switching configuration information according to the type of the core network supported by the source base station and indicated in the first message, and sends the switching configuration information to the CU, so that after receiving the switching configuration information, the CU sends the switching configuration information to the source base station, and then the source base station sends the switching configuration information to the terminal, thereby completing switching of the terminal from the source base station to the target base station.

Fig. 9 to 12 illustrate a method for indicating a core network type, and a first network node and a second network node provided in an embodiment of the present invention are described below with reference to fig. 13 and 14.

Fig. 13 is a schematic structural diagram of a communication device according to an embodiment of the present invention. As shown in fig. 13, the communication apparatus includes a transmitting unit 1310.

A sending unit 1310, configured to send a first message to a second network node, where the first message is used to indicate core network types supported by the communication device and the second network node, so as to implement core network type indication communication between the communication device and the second network node.

Optionally, in an embodiment of the present invention, the communication device includes only a radio link control layer, a medium access control layer, and a physical layer; the second network node only comprises a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer; or,

Optionally, in an embodiment of the invention, the communication means is a distributed unit DU, the second network node is a central unit CU; alternatively, the communication device is a CU and the second network node is a DU. And the indication of the core network type of interaction between the CU and the DU under the CU-DU framework is realized.

Optionally, in an embodiment of the present invention, the first message includes core network type public land mobile network PLMN information and/or tracking area code TAC information.

Optionally, in an embodiment of the present invention, the first message includes cell barring information of a core network type.

Optionally, in an embodiment of the present invention, the communication device further includes a receiving unit 1320 and a processing unit 1330;

a receiving unit 1320, configured to receive a second message, where the second message is used to determine a core network type;

the processing unit 1330 is configured to determine the core network type according to the second message.

Optionally, in an embodiment of the present invention, the communication device may further include a storage unit for storing data and instructions.

The functions of the functional units in the communication apparatus may be implemented by the steps executed by the first network node in the embodiments shown in fig. 9 to fig. 12, and therefore, detailed working processes of the communication apparatus provided in the embodiments of the present invention are not repeated herein.

An embodiment of the present invention further provides a communication apparatus, as shown in fig. 14, the communication apparatus includes a receiving unit 1410.

The receiving unit 1410 is configured to receive a first message sent by a first network node, where the first message is used to indicate a core network type supported by a communication device and the first network node, and the core network type indication communication between the first network node and the communication device is implemented.

Optionally, in an embodiment of the present invention, the communication device includes only a radio resource control protocol layer, a service data adaptation layer, and a packet data convergence protocol layer, and the first network node includes only a radio link control layer, a media access control layer, and a physical layer; or,

Optionally, in an embodiment of the invention, the first network node is a distributed unit DU and the communication means is a central unit CU; alternatively, the first network node is a CU and the communication means is a DU. And the indication of the core network type of interaction between the CU and the DU under the CU-DU framework is realized.

Optionally, in an embodiment of the present invention, the communication apparatus may further include a transmitting unit 1420, a processing unit 1430 and a storage unit 1440, where the transmitting unit 1420 is configured to transmit data information to the first network node, the storage unit 1440 is configured to store data and instructions, and the processing unit 1430 is configured to store information such as data information received from the first network node.

The functions of the functional units in the communication apparatus may be implemented by the steps executed by the second network node in the embodiments shown in fig. 9 to fig. 12, and therefore, detailed working processes of the communication apparatus provided in the embodiments of the present invention are not repeated herein.

An embodiment of the present invention further provides a communication apparatus, as shown in fig. 13.

The sending unit 1310 is configured to send a first message to the second network node, where the first message is used to indicate a core network type connected to the terminal at the third network node, so that the communication device and the second network node realize core network type indication communication.

Optionally, in an embodiment of the present invention, the communication device includes only a radio resource control protocol layer, a service data adaptation layer, and a packet data convergence protocol layer; the second network node comprises only a radio link control layer, a medium access control layer and a physical layer.

Optionally, in an embodiment of the invention, the communication means is a central unit CU and the second network node is a distributed unit DU. And the indication of the core network type of interaction between the CU and the DU under the CU-DU framework is realized.

Optionally, in an embodiment of the present invention, the receiving unit 1320 is configured to receive a second message sent by a third network node, where the second message includes information of a core network type.

Optionally, in an embodiment of the present invention, the receiving unit 1320 is further configured to receive a third message sent by the second network node, where the third message includes handover configuration information, and the handover configuration information is generated by the second network node according to a core network type connected to the third network node by the terminal.

An embodiment of the present invention further provides a communication apparatus, as shown in fig. 14.

The receiving unit 1410 is configured to receive a first message sent by the first network node, where the first message is used to indicate a core network type connected to the terminal at the third network node, so that the core network type indication communication between the first network node and the communication device is implemented.

Optionally, in an embodiment of the present invention, the communication device includes only a radio link control layer, a medium access control layer, and a physical layer; the first network node comprises only a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer.

Optionally, in an embodiment of the invention, the communication means is a distributed unit DU and the first network node is a central unit CU. And the indication of the core network type of interaction between the CU and the DU under the CU-DU framework is realized.

Optionally, in an embodiment of the present invention, the processing unit 1430 is configured to generate the handover configuration information according to a core network type to which the terminal is connected at the third network node;

a sending unit 1420, configured to send a third message to the first network node, where the third message includes the handover configuration information, so that the first network node sends the handover configuration information to the third network node.

Fig. 15 is a schematic structural diagram of a communication device according to an embodiment of the present invention. As shown in fig. 15, the communication device includes a processor 1510 coupled to the memory, for reading and executing instructions in the memory to implement:

Optionally, in an embodiment of the invention, the first message comprises at least one of core network type public land mobile network PLMN information and tracking area code TAC information.

Optionally, in an embodiment of the present invention, the processor 1510 is further configured to read and execute instructions in the memory to implement:

and determining the core network type according to the second message.

Optionally, in an embodiment of the invention, the communication means is a distributed unit DU, the second network node is a central unit CU; alternatively, the communication device is a CU and the second network node is a DU.

In an embodiment of the present invention, when the communication device is a DU or a CU, the communication device may further include a transceiver 1520, and the processor 1510 reads instructions in the memory to implement: the control transceiver 1520 sends a first message to the CU or DU.

And in one embodiment, the processor 1510 is further configured to read and execute instructions in the memory to implement: the control transceiver 1520 receives the second message and the processor 1510 determines the core network type from the second message.

Optionally, in one embodiment of the present invention, the communication device further comprises a memory 1530.

Wherein the processor 1510, the transceiver 1520, and the memory 1530 are connected by a communication bus.

The functions of the functional devices in the communication apparatus may be implemented through the steps executed by the first network node in the embodiments shown in fig. 9 to fig. 12, and therefore, detailed working processes of the communication apparatus provided in the embodiments of the present invention are not repeated herein.

An embodiment of the present invention further provides a communication apparatus, as shown in fig. 16, where the communication apparatus includes a processor 1610, and the processor 1610 is coupled to a memory, and reads and executes instructions in the memory to implement:

Optionally, in an embodiment of the present invention, the first message includes at least one of core network type public land mobile network PLMN information and tracking area code TAC information.

Optionally, in an embodiment of the invention, the communication means is a distributed unit DU, the first network node is a central unit CU; alternatively, the communication device is a CU and the first network node is a DU.

When the communication device is a DU or CU, the communication device may further include a transceiver 1620; processor 1610 reads and executes the instructions in memory to implement: the control transceiver 1620 receives the first message sent by the first network node.

Optionally, in one embodiment of the present invention, the communication device further includes a memory 1630.

The processor 1610, the transceiver 1620 and the memory 1630 are connected by a communication bus.

The functions of the functional devices in the communication apparatus may be implemented through the steps executed by the second network node in the embodiments shown in fig. 9 to fig. 12, and therefore, detailed working processes of the communication apparatus provided in the embodiments of the present invention are not repeated herein.

An embodiment of the present invention further provides a communication apparatus, as shown in fig. 15. The processor 1510 reads and executes instructions in memory to implement:

Optionally, in an embodiment of the invention, the communication means is a central unit CU and the second network node is a distributed unit DU.

When the communication device is a CU, the communication device further includes a transceiver 1520, and the processor 1510 reads and executes instructions in the memory to implement: the control transceiver 1520 transmits the first message to the second network node.

And in one embodiment, the processor 1510 is also configured to read and execute instructions in memory to implement: the control transceiver 1520 receives a third message transmitted by the second network node.

An embodiment of the present invention further provides a communication apparatus, as shown in fig. 16, where the processor 1610 reads and executes instructions in the memory to implement:

Optionally, in an embodiment of the present invention, the processor 1610 is further configured to read and execute instructions in the memory to implement:

Optionally, in an embodiment of the invention, the communication means is a distributed unit DU and the first network node is a central unit CU.

When the communication device is a DU, the communication device may further include a transceiver 1620, and processor 1610 reads and executes instructions in the memory to implement: the control transceiver 1620 receives the first message sent by the first network node.

And in one embodiment, processor 1610 reads and executes instructions in memory to implement: and generating handover configuration information according to the type of the core network connected to the third network node by the terminal, and controlling the transceiver 1620 to transmit a third message to the first network node.

Embodiments of the present invention also provide a system, which includes the communication device described in fig. 15 or fig. 16.

An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the methods in fig. 9 to 12.

Embodiments of the present invention also provide a computer program product including instructions, which when executed on a computer, cause the computer to execute the method of fig. 9 to 12.

It should be understood that the processors provided in fig. 15 and 16 may be Central Processing Units (CPUs), other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

In the various embodiments of the invention described above, implementation may be in whole or in part via software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk), among others.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for core network type indication, the method comprising:

a first network node sends a first message to a second network node, wherein the first message is used for indicating core network types supported by the first network node and the second network node;

wherein the first network node is a distributed unit, DU, and the second network node is a central unit, CU; alternatively, the first network node is a CU and the second network node is a DU.

2. The method of claim 1, wherein the first network node comprises only a radio link control layer, a medium access control layer, and a physical layer; the second network node only comprises a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer; or,

3. Method according to claim 1 or 2, wherein the first message comprises public land mobile network, PLMN, information and/or tracking area code, TAC, information of the core network type.

4. The method according to claim 1 or 2, wherein the first message comprises cell barring information for the core network type.

5. The method according to claim 1 or 2, wherein before the first network node sends the first message to the second network node, the method further comprises:

the first network node receiving a second message, the second message being used for determining the core network type;

and the first network node determines the core network type according to the second message.

6. A method for core network type indication, the method comprising:

a second network node receives a first message sent by a first network node, wherein the first message is used for indicating core network types supported by the second network node and the first network node;

7. The method of claim 6, wherein the second network node comprises only a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer, and wherein the first network node comprises only a radio link control layer, a medium access control layer and a physical layer; or,

8. The method according to claim 6 or 7, wherein the first message comprises PLMN information and/or Tracking Area Code (TAC) information of the core network type.

9. The method according to claim 6 or 7, wherein the first message comprises cell barring information for the core network type.

10. A method for core network type indication, the method comprising:

a first network node sends a first message to a second network node, wherein the first message is used for indicating the type of a core network connected with a terminal through a third network node;

wherein the first network node is a concentration unit CU and the second network node is a distribution unit DU.

11. The method according to claim 10, wherein the first network node comprises only a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer; the second network node comprises only a radio link control layer, a media access control layer and a physical layer.

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

and the first network node receives a second message sent by a third network node, wherein the second message comprises the information of the core network type.

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

and the first network node receives a third message sent by the second network node, wherein the third message comprises switching configuration information, and the switching configuration information is generated by the second network node according to the type of a core network connected with the terminal at the third network node.

14. A method for core network type indication, the method comprising:

a second network node receives a first message sent by a first network node, wherein the first message is used for indicating a core network type connected with a terminal at a third network node;

wherein the second network node is a distributed unit, DU, and the first network node is a central unit, CU.

15. The method of claim 14, wherein the second network node comprises only a radio link control layer, a medium access control layer, and a physical layer; the first network node only comprises a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer.

16. The method according to claim 14 or 15, characterized in that the method further comprises:

the second network node generates switching configuration information according to the type of a core network connected with the terminal at a third network node;

the second network node sends a third message to the first network node, where the third message includes the handover configuration information, so that the first network node sends the handover configuration information to the third network node.

17. A communications apparatus, comprising a processor coupled to a memory, configured to read and execute instructions from the memory to implement:

sending a first message to a second network node, the first message indicating core network types supported by the communication device and the second network node;

wherein the communication means is a distributed unit, DU, and the second network node is a central unit, CU; alternatively, the communication device is a CU and the second network node is a DU.

18. The communications apparatus of claim 17, wherein the communications apparatus comprises only a radio link control layer, a medium access control layer, and a physical layer; the second network node only comprises a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer; or,

19. A communication apparatus according to claim 17 or 18, wherein the first message comprises at least one of core network type public land mobile network, PLMN, information and tracking area code, TAC, information.

20. The communications apparatus according to claim 17 or 18, wherein the first message comprises cell barring information for the core network type.

21. The communications apparatus of claim 17 or 18, wherein the processor is further configured to read and execute instructions from the memory to:

and determining the core network type according to the second message.

22. A communication device as claimed in claim 17 or 18, further comprising a memory.

23. A communications apparatus, comprising a processor coupled to a memory and configured to read and execute instructions from the memory to implement:

receiving a first message sent by a first network node, wherein the first message is used for indicating core network types supported by the communication device and the first network node;

wherein the communication means is a distributed unit, DU, and the first network node is a central unit, CU; alternatively, the communication device is a CU and the first network node is a DU.

24. The communications device of claim 23, wherein the communications device comprises only a radio resource control protocol layer, a service data adaptation layer, and a packet data convergence protocol layer, and wherein the first network node comprises only a radio link control layer, a medium access control layer, and a physical layer; or,

25. A communication apparatus according to claim 23 or 24, wherein the first message comprises at least one of core network type public land mobile network, PLMN, information and tracking area code, TAC, information.

26. The communications device according to claim 23 or 24, wherein the first message includes cell barring information for the core network type.

27. A communication device as claimed in claim 23 or 24, further comprising a memory.

28. A communications apparatus, comprising a processor coupled to a memory and configured to read and execute instructions from the memory to implement:

sending a first message to a second network node, wherein the first message is used for indicating the type of a core network connected with a terminal at a third network node;

wherein the communication means is a central unit CU and the second network node is a distributed unit DU.

29. The communications apparatus according to claim 28, wherein the communications apparatus comprises only a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer; the second network node comprises only a radio link control layer, a media access control layer and a physical layer.

30. The communications apparatus of claim 28 or 29, wherein the processor is further configured to read and execute instructions from the memory to:

and receiving a second message sent by a third network node, wherein the second message comprises the information of the core network type.

31. The communications apparatus of claim 28 or 29, wherein the processor is further configured to read and execute instructions from the memory to:

and receiving a third message sent by the second network node, wherein the third message comprises switching configuration information, and the switching configuration information is generated by the second network node according to the type of a core network connected with the terminal at the third network node.

32. A communication device as claimed in claim 28 or 29, further comprising a memory.

33. A communications apparatus, comprising a processor coupled to a memory and configured to read and execute instructions from the memory to implement:

receiving a first message sent by a first network node, wherein the first message is used for indicating a core network type connected with a terminal at a third network node;

wherein the communication means is a distributed unit DU and the first network node is a central unit CU.

34. The communications apparatus of claim 33, wherein the communications apparatus comprises only a radio link control layer, a medium access control layer, and a physical layer; the first network node only comprises a radio resource control protocol layer, a service data adaptation layer and a packet data convergence protocol layer.

35. The communications apparatus of claim 33 or 34, wherein the processor is further configured to read and execute instructions from the memory to:

generating switching configuration information according to the type of a core network connected with the terminal at a third network node;

sending a third message to the first network node, the third message including the handover configuration information for the first network node to send the handover configuration information to the third network node.

36. A communication device as claimed in claim 33 or 34, further comprising a memory.

37. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method according to any one of claims 1 to 16.