CN109246796B

CN109246796B - Communication method and device

Info

Publication number: CN109246796B
Application number: CN201710313858.7A
Authority: CN
Inventors: 刘壮; 高音; 黄河
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2017-05-05
Filing date: 2017-05-05
Publication date: 2021-09-28
Anticipated expiration: 2037-05-05
Also published as: CN109246796A

Abstract

A communication method and apparatus are disclosed, comprising: a CU acquires a global cell ID of a specified cell; a CU inquires a global DU ID to which the global cell ID belongs in a first global ID list stored locally; the CU sends a first message to a corresponding distributed processing network element DU according to the global DU ID, wherein the first message carries the global cell ID; the first global ID list comprises global CU IDs of the CU, global DU IDs of DUs belonging to the CU, and global cell IDs of all cells belonging to the DUs, wherein the global CU IDs are used for uniquely identifying one CU in a global scope, the global DU IDs are used for uniquely identifying one DU in the global scope, and the global cell IDs are used for uniquely identifying one cell in the global scope.

Description

Communication method and device

Technical Field

The present invention relates to the field of communications, and in particular, to a communication method and apparatus.

Background

The 5G network architecture has innovation and networking flexibility. As shown in fig. 1, in a 5G network, a base station on the radio access network side is separated into two functional entities, namely a Centralized processing network element (CU) and a Distributed processing network element (DU). By controlling a plurality of DUs through the CU, the baseband centralized processing of the cloud architecture and the remote distributed service provision for users can be realized. In the architecture of CU-DU separation, a delay-insensitive network function is placed in a CU, a delay-sensitive network function is placed in a DU, and the CU and the DU are transmitted and connected by an ideal/non-ideal fronthaul (frontaul), thereby realizing a multi-point cooperative function and supporting flexible networking of separated or integrated sites. In addition, the architecture with the centralized processing network element and the distributed processing network element separated can also be suitable for the future evolution of 4G.

However, since the base station is separated into CU and DU, the base station previously was a cell directly managing the base station to which the base station belongs, and it is possible to deduce which base station a specific cell belongs to by cell ID (cell identification). However, currently, CU and DU manage the cells belonging to the base station together, and it is not directly known which cells belong to which DUs, and which DUs are managed by CU, which affects the communication between the distributed base station and the terminal.

Aiming at the technical problem that the communication between the distributed base station and the terminal is influenced because CU and DU in the distributed base station can not be identified in the related technology, an effective solution is not provided at present.

Disclosure of Invention

In order to solve the above technical problem, embodiments of the present invention provide a communication method and apparatus.

The present application provides:

a method of communication, comprising:

a centralized processing network element CU acquires a global cell ID of a specified cell;

a CU inquires a global DU ID to which the global cell ID belongs in a first global ID list stored locally;

the CU sends a first message to a corresponding distributed processing network element DU according to the global DU ID, wherein the first message carries the global cell ID;

the first global ID list comprises global CU IDs of the CU, global DU IDs of DUs belonging to the CU, and global cell IDs of all cells belonging to the DUs, wherein the global CU IDs are used for uniquely identifying one CU in a global scope, the global DU IDs are used for uniquely identifying one DU in the global scope, and the global cell IDs are used for uniquely identifying one cell in the global scope.

Wherein, the CU acquires a global cell ID of the specified cell, and the global cell ID comprises one of the following steps:

a CU receives a Radio Resource Control (RRC) message from a network side high-level node, wherein the RRC message carries a global cell ID of a target cell;

a CU inquires about a global cell ID of a service bearing current established cell from a local;

a CU receives a key updating request from other network elements, wherein the key updating request carries a global cell ID of a current cell;

and when the CU judges that the key used for the connection between the CU and the terminal needs to be updated, inquiring the global cell ID of the cell currently accessed by the terminal.

Wherein, the CU sends a first message to the corresponding DU according to the DU ID, including one of:

the CU forwards the RRC message from the network side high-level node to the corresponding DU according to the DU ID;

the CU sends the broadcast message constructed by the CU to the corresponding DU according to the DU ID;

and the CU sends the key updating message constructed by the CU to the corresponding DU according to the DU ID.

Wherein the broadcast message comprises one of:

the CU belongs to the base station architecture information, and the architecture information represents that the base station architecture is integrated or distributed;

all global DU IDs and global cell IDs in the first global ID list.

Wherein the broadcast message is one of:

a master information block MIB;

system information block SIB.

Before the CU sends the key update message constructed by itself to the corresponding DU according to the DU ID, the method further includes: generating a key by using a current Physical Cell Identifier (PCI), a target cell downlink frequency point number (EARFCN-DL) and the global DU ID;

the key update message or the RRC message includes: the key is described.

Wherein, still include: and receiving a second message from the DU and sending the second message to a network side, wherein the second message carries the global cell ID.

Wherein the second message is one of:

RRC message from terminal and needing to be forwarded to network side;

a message constructed from the DUs.

Before obtaining the global cell ID of the designated cell, the method further includes: and generating the global cell ID, the global DU ID and the global CU ID according to a predefined format, establishing the first global ID list and storing the first global ID list in the local of the CU.

Wherein the generating the global cell ID, the global DU ID, and the global CU ID according to the predefined format includes:

generating the global cell ID based on a Public Land Mobile Network (PLMN) ID and a predefined cell ID;

generating the global DU ID based on a PLMN ID and a predefined DU ID;

generating the global CU ID based on a PLMN ID and a predefined CU ID;

the cell ID is used for uniquely identifying a cell belonging to the same DU, the DU ID is used for uniquely identifying a DU belonging to the same CU, and the CU ID is used for uniquely identifying a CU belonging to the same base station.

Wherein the generating the global CU ID according to the predefined format further comprises one of: predefining the CU ID with a base station ID; predefining the CU ID with a first bit identifier of a predetermined format;

wherein the generating the global DU ID according to the predefined format further includes one of:

predefining the DU ID with a second bit identifier of a predetermined format;

predefining the DU ID with a base station ID;

the DU ID is predefined with the CU ID.

Wherein the generating the global cell ID according to the predefined format further comprises:

the cell identity is predefined by an extended length evolved universal terrestrial radio access network cell identity, ECI.

A method of communication, comprising:

a distributed processing network element DU receives a first message from a centralized processing network element CU, wherein the first message carries a global cell ID;

inquiring a second global ID list stored locally according to the global cell ID carried in the first message;

when the global cell ID is inquired in the second global ID list, the first message is sent to a terminal;

the second global ID list includes global DU IDs of the DUs, global CU IDs of CUs to which the DUs belong, and global cell IDs of all cells belonging to the DUs, where the global CU IDs are used to uniquely identify one CU globally, the global DU IDs are used to uniquely identify one DU globally, and the global cell IDs are used to uniquely identify one cell globally.

Wherein the first message is one of:

a radio resource control, RRC, message;

broadcasting the message;

a key update message.

Wherein the broadcast message is one of:

a master information block MIB;

system information block SIB.

Wherein the broadcast message comprises one of: the CU belongs to the base station architecture information, and the architecture information represents that the base station architecture is integrated or distributed; global DU IDs for all DUs managed by the CU and global cell IDs attributed to the DUs.

Wherein the key update message or the RRC message comprises: and the CU uses the current physical cell identification PCI, the target cell downlink frequency point number EARFCN-DL and the key generated by the global DU ID.

Wherein, still include: acquiring a global cell ID of a designated cell; inquiring the global CU ID of a CU to which the local CU belongs in a locally stored global DU ID list; and sending a second message to the corresponding CU according to the global CU ID, wherein the second message carries the global cell ID.

Wherein, the obtaining of the global cell ID of the designated cell includes one of: receiving an RRC message from a terminal, wherein the RRC message carries a global cell ID of a current service cell of the terminal; the local query service carries the global cell ID of the currently established cell.

Wherein the second message is one of: RRC message from terminal and needing to be forwarded to network side; the message constructed by this DU.

A method of communication, comprising:

a terminal receives a first message from a distributed processing network element (DU), wherein the first message carries a global cell ID;

the first message is one of:

a radio resource control, RRC, message;

broadcasting the message;

a key update message.

Wherein, when the first message is a key update message, after receiving the first message from the DU, the method further includes: and the terminal generates a key by using the current physical cell identifier PCI, the downlink frequency point number EARFCN-DL of the target cell and the global DU ID.

Wherein, still include: and sending an RRC message to the DU, wherein the RRC message carries the global cell ID of the current service cell of the terminal or the global cell ID of the cell to be accessed.

A communication device, comprising:

a first obtaining module, configured to obtain a global cell ID of a designated cell;

a first query module, configured to query a global DU ID to which the global cell ID belongs in a first global ID list stored locally;

a first sending module, configured to send a first message to a corresponding DU according to the global DU ID, where the first message carries the global cell ID;

the first global ID list includes global CU IDs of the local centralized processing network element CUs, global DU IDs of the distributed processing network elements DU belonging to the local CU, and global cell IDs of all cells belonging to the DU, where the global CU IDs are used to uniquely identify one CU globally, the global DU IDs are used to uniquely identify one DU globally, and the global cell IDs are used to uniquely identify one cell globally.

The first obtaining module is specifically configured to obtain a global cell ID of a specified cell in one of the following manners:

receiving a Radio Resource Control (RRC) message from a network side high-level node, wherein the RRC message carries a global cell ID of a target cell;

the global cell ID of the current established cell is borne from the local query service;

receiving a key updating request from other network elements, wherein the key updating request carries a global cell ID of a current cell;

and when judging that the key used for the connection between the terminal and the terminal needs to be updated, inquiring the global cell ID of the cell currently accessed by the terminal.

The first sending module is specifically configured to send a first message to a corresponding DU in one of the following manners:

Wherein the broadcast message comprises one of: the CU belongs to the base station architecture information, and the architecture information represents that the base station architecture is integrated or distributed; all global DU IDs and global cell IDs in the first global ID list.

Wherein, still include: a first generation module, configured to generate a key using a current physical cell identifier PCI, a target cell downlink frequency point number EARFCN-DL, and the global DU ID; the key update message or the RRC message includes: the key is described.

Wherein, still include: and the first receiving module is used for receiving a second message from the DU and sending the second message to the network side, wherein the second message carries the global cell ID.

Wherein the second message is one of: RRC message from terminal and needing to be forwarded to network side; a message constructed from the DUs.

A communication device, comprising:

a second receiving module, configured to receive a first message from a centralized processing network element CU, where the first message carries a global cell ID;

the second query module is used for querying a second global ID list stored locally according to the global cell ID carried in the first message;

a second sending module, configured to send the first message to a terminal when the second query module queries the global cell ID in a second global ID list;

the second global ID list includes a global DU ID of the distributed processing network element DU, a global CU ID of a CU to which the DU belongs, and global cell IDs of all cells belonging to the DU, where the global CU ID is used to uniquely identify one CU globally, the global DU ID is used to uniquely identify one DU globally, and the global cell ID is used to uniquely identify one cell globally.

Wherein the first message is one of: a radio resource control, RRC, message; broadcasting the message; a key update message.

Wherein the broadcast message may include one of: the CU belongs to the base station architecture information, and the architecture information represents that the base station architecture is integrated or distributed; global DU IDs for all DUs managed by the CU and global cell IDs attributed to the DUs.

Wherein the key update message includes: and the CU uses the current physical cell identification PCI, the target cell downlink frequency point number EARFCN-DL and the key generated by the global DU ID.

Wherein, still include: a second obtaining module, configured to obtain a global cell ID of the designated cell; the second query module is further configured to query a global DU ID list stored locally for global CU IDs of CUs to which the local DU belongs; the second sending module is further configured to send a second message to the corresponding CU according to the global CU ID, where the second message carries the global cell ID.

The second obtaining module is specifically configured to obtain the global cell ID of the specified cell in one of the following manners: receiving an RRC message from a terminal, wherein the RRC message carries a global cell ID of a current service cell of the terminal; the local query service carries the global cell ID of the currently established cell.

A communication device, comprising:

a third receiving module, configured to receive a first message from a distributed processing network element DU, where the first message carries a global cell ID;

the first message is one of:

a radio resource control, RRC, message;

broadcasting the message;

a key update message.

Wherein, still include: and the third generation module is used for generating a key by using the current physical cell identifier PCI, the target cell downlink frequency point number EARFCN-DL and the global DU ID.

A CU, comprising:

a memory storing a communication program;

a processor configured to execute the communication program to perform operations of:

acquiring a global cell ID of a designated cell;

querying a global DU ID to which the global cell ID belongs in a first global ID list stored locally;

sending a first message to a corresponding DU according to the global DU ID, wherein the first message carries the global cell ID;

A computer-readable storage medium having stored thereon a communication program which, when executed by a processor, implements the steps of one of the communication methods described above.

A DU, comprising:

a memory storing a communication program;

receiving a first message from a centralized processing network element CU, wherein the first message carries a global cell ID;

A computer-readable storage medium, having a communication program stored thereon, the communication program, when executed by a processor, implementing the steps of another communication method described above.

A terminal, comprising:

a memory storing a communication program;

receiving a first message from a distributed processing network element (DU), wherein the first message carries a global cell ID;

the first message is one of: a radio resource control, RRC, message; broadcasting the message; a key update message.

A computer-readable storage medium having a communication program stored thereon, the communication program, when executed by a processor, implementing the steps of yet another communication method described above.

In the embodiment of the invention, the CU and the DU can communicate through the predefined global CU ID, global DU ID and global cell ID, so that the technical problem that the communication between the CU and the terminal is influenced by the fact that the CU and the DU cannot be identified in the related technology is solved, and the CU and the DU in the distributed base station can smoothly communicate with the terminal. The method of this embodiment is applicable to wireless communication networks with separated centralized processing network elements and distributed processing network elements, and is not limited to 5G and 4G networks.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a schematic diagram of a base station architecture with CU/DU separation;

FIG. 2 is a flow chart illustrating a communication method according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a structure of a communication device according to an embodiment of the present invention;

FIG. 4 is a flowchart illustrating a communication method according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a five-communication apparatus according to an embodiment of the present invention;

fig. 6 is a flowchart illustrating a seventh communication method according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an eighth exemplary embodiment of a communication device according to the present invention;

FIG. 8 is a schematic diagram showing the identification management of CUs in embodiment 1;

FIG. 9 is a diagram illustrating identity management of DUs in embodiment 2;

FIG. 10 is a schematic flowchart of a CU sending a message to a DU by querying a global DU ID in embodiment 3;

FIG. 11 is a schematic flow chart of a DU sending a message to a CU by querying a global CU ID in implementation 4;

FIG. 12 is a diagram of broadcasting MIB in implementation 5;

FIG. 13 is a diagram of broadcasting SIBs in implementation 6;

fig. 14 is a schematic diagram of the key update process in embodiment 7.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.

Since the base station is separated into CU and DU, the former base station is a cell directly managing belonging to the base station, and it is possible to deduce to which base station a specific cell belongs from a cell ID (cell identification). However, in the related art, the CU and the DU jointly manage the cells belonging to the base station, and it is not directly known which cells belong to which DUs, and which DUs the CU manages, which affects the communication between the distributed base station and the terminal. Therefore, it is necessary to identify the DU and CU and establish their mapping relationship to avoid affecting the communication between the distributed base station and the terminal due to their identification problem.

Example one

A communication method, as shown in fig. 2, comprising:

step 201, CU obtains global cell ID of the specified cell;

step 202, a CU inquires a global DU ID to which the global cell ID belongs in a first global ID list stored locally;

step 203, the CU sends a first message to a corresponding DU according to the global DU ID, where the first message carries the global cell ID;

Through the embodiment, the CU and the DU can communicate through the predefined global CU ID, global DU ID and global cell ID, the technical problem that the communication between the CU and the terminal is influenced by the fact that the CU and the DU cannot be identified in the related technology is solved, and the CU and the DU in the distributed base station can smoothly communicate with the terminal. The method of this embodiment is applicable to wireless communication networks with separated centralized processing network elements and distributed processing network elements, and is not limited to 5G and 4G networks.

In this embodiment, the CU acquiring the global cell ID of the designated cell may include one of:

a CU receives an RRC message from a network side high-level node, wherein the RRC message carries a global cell ID of a target cell;

In this embodiment, the sending, by the CU, the first message to the corresponding DU according to the DU ID includes one of the following:

the CU forwards a Radio Resource Control (RRC) message from a network side high-level node to a corresponding DU according to the DU ID;

In this embodiment, the first message may be one of the following: RRC messages, broadcast messages, key update messages. In practical applications, the first message may also be other messages interacted between the CU and the DU, which is not limited herein. Here, the first message refers to a message sent by the CU to the DU,

in one implementation, the broadcast message may include one of the following: 1) the CU belongs to the base station architecture information, and the architecture information represents that the base station architecture is integrated or distributed; 2) all global DU IDs and global cell IDs in the first global ID list. In this way, the DU can know the global DU ID and the global cell ID of all DUs managed by the CU to which the DU belongs, and the configuration information of the base station to which the DU belongs, through the broadcast message. In practical applications, the broadcast message may specifically be one of the following: MIB and SIB.

In this embodiment, before the CU sends the key update message constructed by the CU to the corresponding DU according to the DU ID, the method may further include: a key is generated using the PCI, EARFCN-DL, and the global DU ID. In this way, the CU can include the key in the key update message or the RRC message sent to the DU, so that the DU sends the key to the terminal through a corresponding message, and the terminal and the network side can perform secure communication through the key to ensure the security of communication between the terminal and the network side (including the CU-DU split base station).

For example, a CU receives an RRC message that needs to be forwarded to a DU or the CU constructs a message that needs to be sent to the DU, and the CU may query, from a first global ID list stored locally, a global DU ID to which a global cell ID carried in the message or needs to be carried belongs, and send the RRC message that needs to be forwarded to the DU or the message that the CU constructs that needs to be sent to the DU to the corresponding DU. Here, the RRC message that needs to be forwarded to the DU or the message that needs to be sent to the DU and is constructed by the CU is the first message described above in this embodiment.

For another example, the CU to which each base station belongs may query global DU ID Information and global cell ID Information managed by the CU, and the CU may configure the queried DU ID Information managed by the CU, cell ID Information (i.e., a first global ID list) corresponding to the DU, and architecture Information of the base station (the architecture Information is used to indicate whether the architecture of the current base station is distributed or integrated) into a Master Information Block (MIB) or a System Information Block (SIB). The CU sends the configured MIB or SIB to the DU, and the DU broadcasts the MIB or SIB. The DUs broadcast the MIB or SIB, and the terminal can acquire information such as which base station the cell to be accessed belongs to, whether the base station is distributed or integrated, the global CU ID of the CU subordinate to the base station, the global DU ID of each DU subordinate to the CU, and the global cell ID corresponding to each DU by receiving the MIB or SIB.

As another example, a terminal may switch between different DUs and may maintain a connection with multiple DUs at the same time, possibly requiring secure communication for connections established on different DUs. It is necessary to perform key update on the wireless network side at the time of communication in order to securely communicate between the DU and the terminal. In the related art, the access stratum key update calculation in the wireless communication system is calculated by using a Physical Cell IDentity (PCI) and a target cell downlink frequency point number (EARFCN-DL). When the base station on the network side is separated into CUs and DUs, there is a need to generate keys for connections of different DUs. In this embodiment, when a CU receives a key update request or when the CU determines that a key used for connecting to a terminal needs to be updated, the CU queries a global DU ID corresponding to a global cell ID connected to a current terminal, and calculates an updated key using all or part of a current Physical Cell IDentity (PCI), a target cell downlink frequency number (EARFCN-DL), and the queried global DU ID as input options. Here, other parameters of the key calculation may also be combined when calculating the key. Then, the CU can include the key in a key update message or an RRC message and send the key to the DU, and then the DU sends the key update message or the RRC message including the key to the terminal, so that the terminal also updates the corresponding key at the same time, thereby implementing secure communication between the terminal and the distributed base station. In practical applications, the key update message or the RRC message including the key may further include a global DU ID, a target PCI, and a target EARFCN-DL corresponding to a global cell ID to which the current terminal is connected.

In this embodiment, the method may further include: and the CU receives a second message from the DU and sends the second message to the network side, wherein the second message carries the global cell ID. Wherein the second message may be one of: 1) RRC message from terminal and needing to be forwarded to network side; 2) a message constructed from the DUs. In this way, the CU can transmit messages from the DU to the network side. Here, the second message refers to a message sent from the DU to the CU. In practical applications, the second message may also be other types of messages, and the present disclosure is not limited thereto.

In this embodiment, before obtaining the global cell ID of the designated cell, the method may further include: and generating the global cell ID, the global DU ID and the global CU ID according to a predefined format, establishing the first global ID list and storing the first global ID list in the local of the CU. Thus, the CUs can communicate using the global cell ID, the global DU ID, and the global CU ID.

Wherein the generating the global cell ID, the global DU ID, and the global CU ID according to the predefined format may include: generating the global cell ID based on a Public Land Mobile Network (PLMN) ID and a predefined cell ID; generating the global DU ID based on a PLMN ID and a predefined DU ID; generating the global CU ID based on a PLMN ID and a predefined CU ID; the cell ID is used for uniquely identifying a cell belonging to the same DU, the DU ID is used for uniquely identifying a DU belonging to the same CU, and the CU ID is used for uniquely identifying a CU belonging to the same base station.

Here, the generating the global CU ID according to a predefined format may further include predefining the CU ID, where the CU ID may be predefined in one of the following manners: 1) predefining the CU ID with a base station ID; 2) predefining the CU ID with a first bit identifier of a predetermined format;

here, the generating the global DU ID according to the predefined format may further include predefining the DU ID, where the DU ID may be predefined in one of the following manners: 1) predefining the DU ID with a second bit identifier of a predetermined format; 2) predefining the DU ID with a base station ID; 3) the DU ID is predefined with the CU ID.

Here, the generating the global cell ID in a predefined format may further include predefining the cell ID, wherein the cell ID may be predefined by an extended length evolved universal terrestrial radio access network cell identity, ECI.

In this embodiment, each CU stores a first global ID list of the node, where the first global ID list includes global DU IDs of all DUs managed by the CU and global cell IDs of all cells managed by each DU. Each DU stores a second global ID list of the node, where the second global ID list includes global CU IDs of CUs to which the DU belongs and global cell IDs of all cells managed by the DU.

In this embodiment, the global CU ID and CU ID for identifying a CU, the global DU ID and DU ID for identifying a DU, and the global cell ID and cell ID for identifying a cell are defined as follows:

in one implementation, the CU ID may be defined in the following optional way:

1) defining the CU ID by using a base station ID;

in existing wireless communication networks, base stations in a Public Land Mobile Network (PLMN) are typically identified by base station IDs. For example, the base station ID of a certain base station may be used as the CU ID of the CU in the base station, and the CU IDs may be defined as the same base station ID, so that a CU can be uniquely identified in a PLMN network.

2) The CU ID in a PLMN network is indicated by a first bit identifier in a predetermined format and may not coincide with the base station ID. But the CU ID uniqueness needs to be guaranteed in a PLMN network.

In one implementation, the DU ID may be defined by one of the following:

1) representing the DU IDs of the DUs belonging to the same CU by using a second bit identifier in a predetermined format;

specifically, the DUs belonging to the same CU are individually identified by a second bit identifier in a predetermined format. I.e. the DU IDs under the same CU are all unique, but DUs under different CUs may have the same ID.

2) Defining the DU ID with a base station ID;

for example, the DU ID may be defined as follows in the PLMN network: the PLMN DU ID is CU ID + DU ID, which ensures that a DU is uniquely identified in a PLMN network.

3) The DU ID is defined by a CU ID.

The DU ID may be defined in the PLMN network as follows: the DU ID in the PLMN network is base station ID + DU ID, which ensures that a DU is uniquely identified in a PLMN network.

In one implementation, the method may further include: defining a global CU ID (PLMN ID + CU ID) for uniquely identifying a CU in a global range; a global DU ID + PLMN DU ID is defined for uniquely identifying a DU globally.

Wherein, the global CU ID may be defined as follows: the global CU ID is PLMN ID + CU ID, wherein bits are used to identify the global CU ID, wherein bits at the leftmost end are used to identify the PLMN ID, and the remaining bits are used to identify the CU ID, which is used to uniquely identify a centralized processing network element globally.

Wherein, the global DU ID may be defined as follows: global CU ID ═ PLMN ID + CU ID + DU ID; the global DU ID is identified by a plurality of bits, the leftmost bits are used for identifying the PLMN ID, the next bits next to the PLMN ID are used for identifying the CU ID, the rest bits immediately following the CU ID are used for identifying the DU ID, and the global DU ID is used for uniquely identifying a distributed processing network element in the global scope.

In practical application, a CU-DU separation architecture is adopted, so that the number of cells to be identified in a network is greatly increased, the length of a cell ID in the related art is not enough to identify so many cells, and the length of the cell ID needs to be extended. In this embodiment, the cell identity is redefined, so as to solve the problem that the cell number is greatly increased and the cell identity cannot be identified in the CU-DU separation architecture.

In this embodiment, the defining the cell identifier may include: the cell identity is defined by an extended length evolved universal terrestrial radio access network cell identity, ECI. In practical applications, in existing wireless communication networks, cells are identified using evolved universal terrestrial radio access network cell identity (ECI), where ECI consists of base station ID + cell ID. The information includes 28bit information, the first 20 bits represent the base station ID, and the last 8 bits represent the cell ID. In this embodiment, the cell identifier is defined by the extended length of the ECI, and is applicable to the LTE and 5G systems.

In one implementation, defining the cell identifier by the extended length ECI may be implemented in the following optional manners:

1) the length of the cell ID of the evolved LTE/5G system is defined to exceed 28 bits, where the cell ID of the evolved LTE/5G system cell is formed by base station ID + cell ID, where the base station ID may be the first 20 bits or may be extended to more bits. The cell ID may be represented by 8 bits later or extended to more bits (e.g. considering that a base station may manage 256 DUs, and a DU may manage 256 cells, then 16 bits may be used to identify the cell ID).

2) The length of the evolved LTE/5G system network cell ID is defined to exceed 28 bits, where the evolved LTE/5G system network cell ID is composed of a base station ID + DU ID + cell ID, where the base station ID may be the first 20 bits or may be extended to more bits. The DU ID may be identified by several bits. The following may use 8 bits, or extend to more bits to represent the cell ID.

In one implementation, the defining the cell identifier may further include: and defining a global cell identification by using the PLMN ID and the cell identification, wherein the global cell identification is used for uniquely identifying one cell in a global range. For example, the global cell identity is PLMN ID + cell ID defined by extended length ECI above, and thus a cell can be uniquely identified on a global scale.

Here, the extended-length global cell ID is defined in an optional manner as follows:

1) the length of the global cell ID exceeds 28 bits, the global cell ID is composed of PLMN ID + base station ID + cell ID, and several bits are used to identify the global cell ID, where several leftmost bits are used to identify the PLMN ID, several subsequent bits immediately after the PLMN ID are used to identify the base station ID, and the remaining bits (more than 8 bits) immediately after the base station ID are used to identify the cell ID (for example, considering that one base station can manage 256 distributed processing network elements, and one distributed processing network element can manage 256 cells, 16 bits can be used to identify the cell ID).

2) The global cell ID length exceeds 28 bits, the global cell ID is composed of PLMN ID + CU ID + DU ID + cell ID, several bits are used to identify the global cell ID, the leftmost bits are used to identify the PLMN ID, the next bits are used to identify the CU ID, several bits next to the CU ID are used to identify the DU ID, and the remaining bits next to the DU ID are used to identify the cell ID.

In this embodiment, after the above respective IDs are defined, a mapping relationship between the respective IDs may be established for use in communication. Specifically, the following contents may be included: 1) establishing a second global ID list corresponding to each DU, wherein the second global ID list comprises CU IDs of CUs to which the DUs belong and global cell IDs of cells managed by the DUs; 2) establishing a first global ID list corresponding to each CU, wherein the first global ID list comprises DU IDs of all DUs managed by the CU and global cell IDs of all cells managed by all DUs; 3) the second global ID list may be associated with the first global ID list by one of a DU ID, a CU ID, and a global cell ID.

By the embodiment, the problem of how to identify and manage the centralized network element and the distributed network element in the wireless network can be effectively solved. By the method for notifying the distributed network element identification, the terminal can identify which distributed network element the current connection is established on, and the problem of safe communication between the terminal and different distributed network elements can be solved by using the distributed network element identification to generate the key.

Example two

A communication apparatus, as shown in fig. 3, comprising:

a first obtaining module 31, configured to obtain a global cell ID of a specified cell;

a first query module 32, configured to query a global DU ID to which the global cell ID belongs in a first global ID list stored locally;

a first sending module 33, configured to send a first message to a corresponding DU according to the global DU ID, where the first message carries the global cell ID;

The first obtaining module 31 may be specifically configured to obtain the global cell ID of the specified cell in one of the following manners: receiving a Radio Resource Control (RRC) message from a network side high-level node, wherein the RRC message carries a global cell ID of a target cell; the global cell ID of the current established cell is borne from the local query service; receiving a key updating request from other network elements, wherein the key updating request carries a global cell ID of a current cell; and when judging that the key used for the connection between the terminal and the terminal needs to be updated, inquiring the global cell ID of the cell currently accessed by the terminal.

The first sending module 33 is specifically configured to send a first message to a corresponding DU in one of the following manners: the CU forwards the RRC message from the network side high-level node to the corresponding DU according to the DU ID; the CU sends the broadcast message constructed by the CU to the corresponding DU according to the DU ID; and the CU sends the key updating message constructed by the CU to the corresponding DU according to the DU ID.

Wherein, can also include: a first generating module 34, configured to generate a key by using a current physical cell identifier PCI, a target cell downlink frequency point number EARFCN-DL, and the global DU ID; the key update message or the RRC message includes: the key is described.

Wherein, can also include: a first receiving module 35, configured to receive a second message from the DU and send the second message to the network side, where the second message carries the global cell ID. Wherein the second message is one of: RRC message from terminal and needing to be forwarded to network side; a message constructed from the DUs.

Wherein, can also include: an ID management module 36, configured to generate the global cell ID, the global DU ID, and the global CU ID according to a predefined format, and establish the first global ID list; a first storage module 37, configured to store the first global ID list locally on the CU.

Wherein the ID management module 36 is configured to generate the global cell ID, the global DU ID, and the global CU ID according to a predefined format as follows: generating the global cell ID based on a PLMN ID and a predefined cell ID; generating the global DU ID based on a PLMN ID and a predefined DU ID; generating the global CU ID based on a PLMN ID and a predefined CU ID; the cell ID is used for uniquely identifying a cell belonging to the same DU, the DU ID is used for uniquely identifying a DU belonging to the same CU, and the CU ID is used for uniquely identifying a CU belonging to the same base station.

Here, the generating the global CU ID according to a predefined format further includes one of: predefining the CU ID with a base station ID; predefining the CU ID with a first bit identifier of a predetermined format;

here, the generating the global DU ID according to a predefined format further includes one of: predefining the DU ID with a second bit identifier of a predetermined format; predefining the DU ID with a base station ID; the DU ID is predefined with the CU ID.

Here, the generating the global cell ID according to a predefined format may further include: the cell identity is predefined by an extended length evolved universal terrestrial radio access network cell identity, ECI.

All details of the method of the embodiments can be implemented by the communication device in this embodiment, and reference may be made to the relevant description of the method. In practical applications, the communication apparatus in this embodiment may be disposed on a CU or other similar devices to implement the above functions, or the communication apparatus in this embodiment may be directly implemented by the CU or other similar devices.

In practical applications, the first obtaining module 31, the first querying module 32, the first sending module 33, the first generating module 34, the first receiving module 35, the ID managing module 36, and the first storing module 37 may be implemented by software, hardware, or a combination of the two. For example, the first obtaining module 31, the first sending module 33, and the first receiving module 35 may be implemented by a processor of the CU controlling a communication unit thereof, the first querying module 32, the first generating module 34, the ID managing module 36, and the like may be implemented by the processor of the CU executing corresponding programs, and the first storing module 37 may be implemented by a memory of the CU or a memory of the processor. And are not intended to be limiting herein.

EXAMPLE III

A CU, comprising:

a memory storing a communication program;

acquiring a global cell ID of a designated cell;

All the details of the method of the embodiment can be implemented by the CU in this embodiment, and reference may be made to the relevant description of the method.

Example four

A communication method, as shown in fig. 4, may include:

step 401, a DU receives a first message from a CU, where the first message carries a global cell ID;

step 402, inquiring a second global ID list stored locally according to the global cell ID carried in the first message;

step 403, when the global cell ID is found in the second global ID list, sending the first message to a terminal;

Wherein the first message may be one of: RRC messages, broadcast messages, key update messages.

Wherein the broadcast message is one of: MIB and SIB.

Wherein the broadcast message may include one of: 1) the CU belongs to the base station architecture information, and the architecture information represents that the base station architecture is integrated or distributed; 2) global DU IDs for all DUs managed by the CU and global cell IDs attributed to the DUs.

Wherein the key update message or the RRC message may further include: the CU uses the current PCI, the target EARFCN-DL, and the key generated by the global DU ID. Here, the key update message or the RRC message may include, in addition to the key: current PCI, target EARFCN-DL, and the global DU ID.

In this embodiment, the method may further include:

acquiring a global cell ID of a designated cell;

inquiring the global CU ID of a CU to which the local CU belongs in a locally stored global DU ID list;

and sending a second message to the corresponding CU according to the global CU ID, wherein the second message carries the global cell ID.

The obtaining of the global cell ID of the designated cell may include one of:

receiving an RRC message from a terminal, wherein the RRC message carries a global cell ID of a current service cell of the terminal;

the local query service carries the global cell ID of the currently established cell.

Wherein the second message may be one of: RRC message from terminal and needing to be forwarded to network side; the message constructed by this DU.

Wherein, can also include: saving the second global ID list locally to the DU. The second global ID list may be sent by the CU to the DU by a broadcast message.

In this embodiment, the definition of the global CU ID, the global DU ID, the global cell ID, the first global ID list and the second global ID list may refer to the description of the first embodiment.

EXAMPLE five

A communication apparatus, as shown in fig. 5, comprising:

a second receiving module 51, configured to receive a first message from a centralized processing network element CU, where the first message carries a global cell ID;

a second query module 52, configured to query a second global ID list stored locally according to the global cell ID carried in the first message;

a second sending module 53, configured to send the first message to the terminal when the second querying module queries the global cell ID in a second global ID list;

Wherein the first message is one of: RRC messages, broadcast messages, key update messages.

Wherein the broadcast message may be one of: MIB and SIB.

Wherein, still include: a second obtaining module 54, configured to obtain a global cell ID of the designated cell; the second query module 52 is further configured to query a global DU ID list stored locally for a global CU ID of a CU to which the local DU belongs; the second sending module 53 is further configured to send a second message to the corresponding CU according to the global CU ID, where the second message carries the global cell ID.

The second obtaining module 54 is specifically configured to obtain the global cell ID of the specified cell in one of the following manners: receiving an RRC message from a terminal, wherein the RRC message carries a global cell ID of a current service cell of the terminal; the local query service carries the global cell ID of the currently established cell.

Wherein, can also include: a second storing module 55, configured to store the second global ID list in a local area of the DU.

All the details of the method of the fourth embodiment can be implemented by the communication device in this embodiment, and reference may be made to the related description of the method. In practical applications, the communication apparatus in this embodiment may be disposed on a DU or other similar device to implement the above functions, or the communication apparatus in this embodiment may be directly implemented by the DU or other similar device.

In practical applications, the second receiving module 51, the second querying module 52, the second sending module 53, and the second obtaining module 54 may be implemented by software, hardware, or a combination of the two. For example, the second receiving module 51, the second sending module 53, and the second obtaining module 54 may be implemented by a processor of the DU controlling a communication unit thereof, and the second querying module 52 may be implemented by the processor of the DU executing corresponding programs. And are not intended to be limiting herein.

EXAMPLE six

A DU, comprising:

a memory storing a communication program;

receiving a first message from a CU, wherein the first message carries a global cell ID;

All details of the method of the fourth embodiment can be realized by the DU in this embodiment, and reference may be made to the related description of the method.

EXAMPLE seven

A communication method, as shown in fig. 6, comprising:

601, a terminal receives a first message from a distributed processing network element (DU), wherein the first message carries a global cell ID;

the first message is one of:

a radio resource control, RRC, message;

broadcasting the message;

a key update message.

Wherein, when the first message is a key update message, after receiving the first message from the DU, the method further includes: step 602, the terminal generates a key by using the current PCI, the target EARFCN-DL, and the global DU ID. That is, when the first message is a key update message or RRC message including a key and its related information (e.g., global DU ID, target PCI, and target EARFCN-DL), after receiving the first message, the terminal may further calculate the updated key using all or part of the target PCI, target EARFCN-DL, and global DU ID as input options. The terminal may then communicate with the distributed base stations using the key to ensure communication security.

Wherein, can also include: and sending an RRC message to the DU, wherein the RRC message carries the global cell ID of the current service cell of the terminal or the global cell ID of the cell to be accessed.

Example eight

A communication apparatus, as shown in fig. 7, may include:

a third receiving module 71, configured to receive a first message from a distributed processing network element DU, where the first message carries a global cell ID;

the first message is one of:

a radio resource control, RRC, message;

broadcasting the message;

a key update message.

Wherein, can also include: a third generating module 72, configured to generate a key using the current PCI, the target EARFCN-DL, and the global DU ID.

Wherein, can also include: a third storing module 73, configured to store the global CU ID, the global DU ID, the global cell ID, and the like related to the base station, which are carried in the first message, in the local area of the terminal.

All the details of the method of the seventh embodiment can be implemented by the communication device in this embodiment, and reference may be made to the relevant description of the method. In practical applications, the communication apparatus in this embodiment may be disposed on a terminal or other similar devices to implement the above functions, or the communication apparatus in this embodiment may be directly implemented by the terminal or other similar devices.

In practical applications, the third receiving module 71 and the third generating module 72 may be implemented by software, hardware or a combination of both. For example, the third receiving module 71 may be implemented by a processor of the terminal controlling a communication unit thereof, the third generating module 72, etc. may be implemented by a processor of the terminal executing a corresponding program. And are not intended to be limiting herein.

Example nine

A terminal, comprising:

a memory storing a communication program;

receiving a first message from a DU, wherein the first message carries a global cell ID;

the first message is one of:

a radio resource control, RRC, message;

broadcasting the message;

a key update message.

All the details of the seventh method of the embodiment can be realized by the terminal in this embodiment, and reference can be made to the related description of the method.

The present application will be described in detail with reference to examples.

Example 1

In this example, the CU side stores and maintains the global DU ID of each DU managed by itself and the global cell ID of each cell managed by each DU.

As shown in fig. 8, DUs 1 to DUn indicate that the CU manages n (n is an integer not less than 1) valid DUs, and each CU holds and maintains a first global ID list managed under the own node and a second global ID list of each DU. For example, it may be known which DUs the CU controls and manages by querying the first global ID list, and it may also be known which DUs are controlled and managed by the CU. By querying the first global ID list and the second global ID list, it is known which cells are controlled and managed by the CU, and which cells are controlled and managed by the CU.

Example 2

In this example, the DU side stores and maintains the global cell ID of each cell managed by itself and the global CU ID of the CU to which the DU belongs.

As shown in fig. 9, each DU stores and maintains a second global ID list managed under the node, which indicates which cells the DU manages, and can know which cells the DU controls and manages by querying the list, and can also know which cells are controlled and managed by the DU. The DU also stores and maintains the global CU ID to which the node belongs, and by this global CU ID, the DU can know which CU the node is controlled by.

Example 3

In this example, the CU side sends a message to the DU by querying the global DU ID to which the global cell ID belongs.

As shown in fig. 10, the flow of this example may include:

1001, a CU receives RRC messages from other high-level nodes or constructs messages needing to be sent to a DU;

step 1002, a CU inquires about a global DU ID to which a global cell ID carried or required to be carried belongs;

step 1003, sending the RRC message or the constructed message to the DU corresponding to the global DU ID.

Example 4

In this example, the DU side sends a message to the CU by querying the global CU ID to which it belongs.

As shown in fig. 11, the flow of this example may include:

step 1101, a DU receives an RRC message from a terminal, or constructs a message to be sent to a CU;

step 1102, a DU queries the global CU ID to which the DU belongs;

step 1103, sending the RRC message or the constructed message to the corresponding global CU ID.

Example 5

In this example, the corresponding relationship between the terminal DU ID and the cell is notified by MIB broadcast.

As shown in fig. 12, the flow of this example may include:

step 1201, a CU to which each base station belongs may query the global DU ID of each DU managed by the CU and the global cell ID of a cell managed by each DU;

step 1202, the CU configures the inquired global DU ID, global cell ID and the architecture information of the base station to the MIB;

step 1203, sending the MIB to the DU by the CU;

in step 1204, the MIB is broadcast.

The DU broadcasts the MIB, and the terminal can know which base station the cell to be accessed belongs to by receiving the MIB information, whether the base station is distributed or integrated, and the global CU ID, the global DU ID, the global cell ID and the corresponding relation thereof in the base station.

Example 6

In this example, the correspondence between the terminal DU ID and the cell is notified by SIB broadcasting.

As shown in fig. 13, the flow of this example may include:

step 1301, a CU to which each base station belongs may query a global DU ID of each DU managed by the CU and a global cell ID of a cell managed by each DU;

step 1302, the CU configures the queried global DU ID, global cell ID and base station architecture information to the SIB;

step 1303, the CU sends the SIB to the DU;

in step 1304, the SIB is broadcast.

The terminal can know which base station the cell to be accessed belongs to, whether the base station is distributed or integrated, and the global CU ID, the global DU ID, the global cell ID and the corresponding relation thereof in the base station by receiving the SIB.

Example 7

In this example, the key is updated using the global CU ID, the global DU ID, the global cell ID, and the corresponding relationship thereof.

As shown in fig. 14, the flow of this example may include:

step 1401, after receiving the key updating request or when deciding that the key updating is needed, the CU queries the global DU ID to which the global cell ID of the target cell connected to the current terminal corresponds;

step 1402, the CU performs key update calculation to obtain an updated key, with respect to all or part of the current PCI of the target cell of the user terminal, the downlink frequency point number of the target cell, and the inquired global DU ID as inputs;

step 1403, the CU sends a key update message containing the key and its related information to the DU corresponding to the global DU ID, or carries the key and its related information in other RRC messages such as a handover command, an RRC reconfiguration command, etc. sent to the DU;

step 1404, the DU sends the key update message containing the key and the related information thereof, or other RRC messages carrying the key and the related information thereof to the terminal;

step 1405, after receiving the above message, the terminal uses all or part of the key related information (such as the target cell PCI, the target cell downlink frequency point number, and the DU ID where the target cell is located) as input, calculates the key, and updates the key.

In addition, an embodiment of the present application further provides a computer-readable storage medium, where a communication program is stored on the computer-readable storage medium, and the communication program, when executed by a processor, implements the steps of the communication method according to the first embodiment.

In addition, an embodiment of the present application further provides a computer-readable storage medium, where a communication program is stored, and when executed by a processor, the communication program implements the steps of the communication method according to the fourth embodiment.

In addition, an embodiment of the present application further provides a computer-readable storage medium, where a communication program is stored on the computer-readable storage medium, and the communication program, when executed by a processor, implements the steps of the communication method according to the seventh embodiment.

Optionally, in this embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.

Optionally, in this embodiment, the processor executes the method steps of the above embodiments according to the program code stored in the storage medium.

Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.

It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by a program instructing associated hardware (e.g., a processor) to perform the steps, and the program may be stored in a computer readable storage medium, such as a read only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, the modules/units in the above embodiments may be implemented in hardware, for example, by an integrated circuit, or may be implemented in software, for example, by a processor executing programs/instructions stored in a memory to implement the corresponding functions. The present application is not limited to any specific form of hardware or software combination.

The foregoing shows and describes the general principles and features of the present application, together with the advantages thereof. The present application is not limited to the above-described embodiments, which are described in the specification and drawings only to illustrate the principles of the application, but also to provide various changes and modifications within the spirit and scope of the application, which are within the scope of the claimed application.

Claims

1. A method of communication, comprising:

2. The communication method according to claim 1, wherein the CU obtains a global cell ID of the specified cell, comprising one of:

3. The communication method according to claim 1, wherein the CU sends a first message to the corresponding DU according to the DU ID, comprising one of:

4. The communication method of claim 3, wherein the broadcast message comprises one of:

all global DU IDs and global cell IDs in the first global ID list.

5. The communication method according to claim 3 or 4, wherein the broadcast message is one of:

a master information block MIB;

system information block SIB.

6. The communication method according to claim 3,

the key update message or the RRC message includes: the key is described.

7. The communication method according to claim 1, further comprising:

and receiving a second message from the DU and sending the second message to a network side, wherein the second message carries the global cell ID.

8. The communication method according to claim 7, wherein the second message is one of:

RRC message from terminal and needing to be forwarded to network side;

a message constructed from the DUs.

9. The communication method according to claim 1, further comprising, before obtaining the global cell ID of the specified cell:

and generating the global cell ID, the global DU ID and the global CU ID according to a predefined format, establishing the first global ID list and storing the first global ID list in the local of the CU.

10. The communication method according to claim 9, wherein the generating the global cell ID, global DU ID and global CU ID according to a predefined format comprises:

generating the global DU ID based on a PLMN ID and a predefined DU ID;

generating the global CU ID based on a PLMN ID and a predefined CU ID;

11. The communication method according to claim 10, wherein the generating the global CU ID according to a predefined format further comprises one of:

predefining the CU ID with a base station ID;

the CU ID is predefined with a first bit identifier of a predetermined format.

12. The communication method according to claim 10, wherein the generating the global DU ID according to a predefined format further comprises one of:

predefining the DU ID with a second bit identifier of a predetermined format;

predefining the DU ID with a base station ID;

the DU ID is predefined with the CU ID.

13. The communications method of claim 10, wherein the generating the global cell ID according to a predefined format further comprises:

14. A method of communication, comprising:

15. The communication method according to claim 14, wherein the first message is one of:

a radio resource control, RRC, message;

broadcasting the message;

a key update message.

16. The communication method of claim 15, wherein the broadcast message is one of:

a master information block MIB;

system information block SIB.

17. The communication method according to claim 15 or 16, wherein the broadcast message comprises one of:

global DU IDs for all DUs managed by the CU and global cell IDs attributed to the DUs.

18. The communication method according to claim 15,

the key update message or the RRC message includes: and the CU uses the current physical cell identification PCI, the target cell downlink frequency point number EARFCN-DL and the key generated by the global DU ID.

19. The communication method according to claim 14, further comprising:

acquiring a global cell ID of a designated cell;

20. The communication method according to claim 19, wherein the obtaining the global cell ID of the designated cell comprises one of:

21. The communications method of claim 19, wherein the second message is one of:

RRC message from terminal and needing to be forwarded to network side;

the message constructed by this DU.

22. A method of communication, comprising:

a terminal receives a first message from a distributed processing network element (DU), wherein the first message carries a global cell ID; wherein, the global DU ID to which the global cell ID belongs is located in a first global ID list; the first global ID list comprises global CU IDs of the CU, global DU IDs of DUs belonging to the CU and global cell IDs of all cells belonging to the DUs, wherein the global CU IDs are used for uniquely identifying one CU in a global scope, the global DU IDs are used for uniquely identifying one DU in the global scope, and the global cell IDs are used for uniquely identifying one cell in the global scope;

the first message is one of:

a radio resource control, RRC, message;

broadcasting the message;

a key update message.

23. The communication method according to claim 22, wherein after receiving the first message from the DU when the first message is the key update message, the method further comprises:

and the terminal generates a key by using the current physical cell identifier PCI, the downlink frequency point number EARFCN-DL of the target cell and the global DU ID.

24. The communication method according to claim 22, further comprising:

and sending an RRC message to the DU, wherein the RRC message carries the global cell ID of the current service cell of the terminal or the global cell ID of the cell to be accessed.

25. A communications apparatus, comprising:

26. The communications apparatus as claimed in claim 25, wherein the first obtaining module is specifically configured to obtain the global cell ID of the specified cell by one of:

27. The communications apparatus as claimed in claim 25, wherein the first sending module is specifically configured to send the first message to the corresponding DU by one of:

28. The communications apparatus of claim 27, wherein the broadcast message comprises one of:

all global DU IDs and global cell IDs in the first global ID list.

29. The communication device of claim 27,

further comprising: a first generation module, configured to generate a key using a current physical cell identifier PCI, a target cell downlink frequency point number EARFCN-DL, and the global DU ID;

the key update message or the RRC message includes: the key is described.

30. The communications device of claim 25, further comprising:

and the first receiving module is used for receiving a second message from the DU and sending the second message to the network side, wherein the second message carries the global cell ID.

31. The communications apparatus of claim 30, wherein the second message is one of:

RRC message from terminal and needing to be forwarded to network side;

a message constructed from the DUs.

32. A communications apparatus, comprising:

33. The communications apparatus of claim 32, wherein the first message is one of:

a radio resource control, RRC, message;

broadcasting the message;

a key update message.

34. The communications apparatus of claim 33, wherein the broadcast message comprises one of:

35. The communication device of claim 33,

the key update message includes: and the CU uses the current physical cell identification PCI, the target cell downlink frequency point number EARFCN-DL and the key generated by the global DU ID.

36. The communications device of claim 32, further comprising:

a second obtaining module, configured to obtain a global cell ID of the designated cell;

the second query module is further configured to query a global DU ID list stored locally for global CU IDs of CUs to which the local DU belongs;

the second sending module is further configured to send a second message to the corresponding CU according to the global CU ID, where the second message carries the global cell ID.

37. The communications apparatus as claimed in claim 36, wherein the second obtaining module is specifically configured to obtain the global cell ID of the specified cell by one of:

38. The communications apparatus of claim 36, wherein the second message is one of:

RRC message from terminal and needing to be forwarded to network side;

the message constructed by this DU.

39. A communications apparatus, comprising:

a third receiving module, configured to receive a first message from a distributed processing network element DU, where the first message carries a global cell ID; wherein, the global DU ID to which the global cell ID belongs is located in a first global ID list; the first global ID list comprises global CU IDs of the CU, global DU IDs of DUs belonging to the CU and global cell IDs of all cells belonging to the DUs, wherein the global CU IDs are used for uniquely identifying one CU in a global scope, the global DU IDs are used for uniquely identifying one DU in the global scope, and the global cell IDs are used for uniquely identifying one cell in the global scope;

the first message is one of:

a radio resource control, RRC, message;

broadcasting the message;

a key update message.

40. The communications device of claim 39, further comprising:

and the third generation module is used for generating a key by using the current physical cell identifier PCI, the target cell downlink frequency point number EARFCN-DL and the global DU ID.

41. A CU, comprising:

a memory storing a communication program;

acquiring a global cell ID of a designated cell;

42. A computer-readable storage medium, having a communication program stored thereon, which when executed by a processor implements the steps of the communication method according to any one of claims 1 to 13.

43. A DU, comprising:

a memory storing a communication program;

44. A computer-readable storage medium, having a communication program stored thereon, which, when executed by a processor, implements the steps of the communication method according to any one of claims 14 to 21.

45. A terminal, comprising:

a memory storing a communication program;

receiving a first message from a distributed processing network element (DU), wherein the first message carries a global cell ID; wherein, the global DU ID to which the global cell ID belongs is located in a first global ID list; the first global ID list comprises global CU IDs of the CU, global DU IDs of DUs belonging to the CU and global cell IDs of all cells belonging to the DUs, wherein the global CU IDs are used for uniquely identifying one CU in a global scope, the global DU IDs are used for uniquely identifying one DU in the global scope, and the global cell IDs are used for uniquely identifying one cell in the global scope;

46. A computer-readable storage medium, having a communication program stored thereon, which, when executed by a processor, carries out the steps of the communication method according to any one of claims 22 to 24.