WO2019063019A1

WO2019063019A1 - Method and device for generating system information

Info

Publication number: WO2019063019A1
Application number: PCT/CN2018/109178
Authority: WO
Inventors: 彭政
Original assignee: 中兴通讯股份有限公司
Priority date: 2017-09-30
Filing date: 2018-09-30
Publication date: 2019-04-04
Also published as: CN109600837B; CN109600837A

Abstract

Provided by the present application are a method and device for generating system information; by using said solution, system information in new radio (NR) is divided into the two portions of central unit (CU) system information and distributed unit (DU) system information; the two portions are independently generated, and after being independently generated, system information is acquired according to the two, and the information is sent to a terminal.

Description

Method and device for generating system information

The present application claims the priority of the Chinese Patent Application, filed on Sep. 30, 2017, the entire disclosure of

Technical field

The present application relates to the field of communications, for example, to a method and apparatus for generating system information.

Background technique

In the related art, in the 5G new system (New Radio, NR), the Third Generation Partnership Project (3GPP) has clearly defined the need to standardize the base station (CU) and the base station distributed unit ( The interface between the Distributed Units, DUs, that is, the F1 interface. A radio resource control (RRC) and a Packet Data Convergence Protocol (PDCP) protocol stack are deployed on the CU side of the F1 interface, and a radio link control (RLC) is deployed on the DU side. Medium Access Control (MAC) and Physical Layer (PHY). In the traditional 4G Long Term Evolution (LTE) base station, multiple protocol stacks of air interfaces are deployed together, and there is no F1 interface.

In a conventional 4G LTE base station system, system information is generated by a base station. In the 5G NR base station, after the CU and the base station DU are separated, a method of generating system information needs to be proposed.

1 is a flowchart of a method for generating system information according to the related art. As shown in FIG. 1 , the process includes: system information is generated by a base station CU by using an ASN.1 code, and a field that cannot be filled by a base station CU needs to be reserved. The bit is reserved for the base station DU to be filled; the base station CU transmits the ASN.1 encoded code stream to the base station DU; and the base station DU refills the reserved bit on the ASN.1 code stream.

However, the above method has a large design flaw. When the base station CU uses the ASN.1 coding system information, it needs to reserve bits for the base station DU padding field. Even if these fields, the base station CU does not need to care. This non-decoupled design introduces higher complexity into the base station system, thereby increasing the cost of the device.

In addition, the solution mentioned by the 3GPP is that the base station CU sends the content of the system information field of all CUs to the base station DU, and the base station DU uniformly produces the system information; or the base station DU transmits all the system information field contents to the base station CU, and the base station The CU uniformly generates system information. This scheme also has design flaws. One of the base station CU and the base station DU needs to pay attention to the other party's system configuration information, and the two parties do not have independent decoupling.

At present, it is necessary to avoid the phenomenon that the complexity of generating system information in the NR system in the related art is high.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The embodiment of the present application provides a method and a device for generating system information, so as to avoid a situation in which the complexity of generating system information in the NR system in the related art is high.

According to an embodiment of the present application, a method for generating system information is provided, including: a central unit CU generates CU system information, where the CU system information is not allowed to carry bits of distributed unit DU system information; The CU system information is addressed to the DU, wherein the CU and the DU are attributed to the first communication node.

According to another embodiment of the present application, a method for generating system information is provided, including: a distributed unit DU receives CU system information transmitted by a central unit CU, where the CU system information is not allowed to carry a distributed unit DU. Bits of system information; the DU generates DU system information, wherein the CU and DU are attributed to the first communication node.

According to another embodiment of the present application, a method for generating system information is provided, including: generating, by a first communication node, at least one of centralized unit CU system information and distributed unit DU system information; according to the CU system At least one of information and DU system information acquires system information; the system information is transmitted to a second communication node.

According to another embodiment of the present application, a method for generating system information is provided, including: receiving, by a second communication node, system information transmitted by a first communication node: wherein the system information includes at least one of the following: The centralized unit CU of the first communication node generates CU system information, and the distributed unit DU of the first communication node generates DU system information.

According to an embodiment of the present application, there is also provided a centralized unit CU, comprising: a first processor configured to generate CU system information, wherein the CU system information does not allow a bit of the distributed unit DU system information to be carried a first communication device arranged to transmit the CU system information to the DU, wherein the CU and the DU are attributed to the first communication node.

According to another embodiment of the present application, there is further provided a distributed unit DU, comprising: a second communication device, configured to receive CU system information transmitted by a central unit CU, wherein the CU system information is not allowed to carry distributed a bit of unit DU system information; a second processor configured to generate DU system information, wherein the CU and DU are attributed to the first communication node.

According to another embodiment of the present application, there is also provided a storage medium comprising a stored program, wherein the program is executed to perform the method described in any of the above embodiments.

According to another embodiment of the present application, there is also provided a processor, the processor being arranged to run a program, wherein the program is executed to perform the method described in any of the above embodiments.

Through the present application, the system information in the new system NR is divided into two parts: CU system information and DU system information, and the two parts are independently generated, and after being independently generated, the system information is obtained according to the two, and is sent to the terminal. It is not a method in which the CU system information is first generated in the related art, and then the DU system information is added to form system information by modifying the CU system information. Compared with the related technology, the base station does not need to parse the CU system information when generating the DU system information. The structure speeds up the processing flow, avoids the high complexity of generating system information in the NR system in the related technology, and greatly reduces the process complexity of generating system information in the NR system. Other aspects will be apparent upon reading and understanding the drawings and detailed description.

DRAWINGS

The drawings described herein are intended to provide an understanding of the present application, and are intended to be a part of this application. In the drawing:

1 is a flow chart of a method for generating system information according to the related art;

2 is a flowchart of a method for generating system information according to an embodiment of the present application;

3 is a schematic flowchart of a system information master information block (MIB) issued according to the embodiment 1;

4 is a schematic diagram of information of a complete MIB system according to Embodiment 1;

FIG. 5 is a schematic flowchart of the system information block 1 (SIB1) information sent according to the embodiment 2;

6 is a schematic diagram of SIB1 system information according to Embodiment 2;

7 is a schematic flowchart of information transmission of an MIB system according to Embodiment 3;

FIG. 8 is a hardware structural diagram of a base station according to an embodiment of the present application.

Detailed ways

A mobile communication network (including but not limited to a 5G mobile communication network) is provided in the embodiment of the present application, and the network architecture of the network may include a network side device (for example, a base station) and a terminal. In this embodiment, an information transmission method that can be run on the network architecture is provided. It should be noted that the operating environment of the foregoing information transmission method provided in the embodiment of the present application is not limited to the foregoing network architecture.

It should be noted that the first communication node in the present application file may be a base station side device, and the second communication node may be a terminal or a user equipment, etc., and is not limited thereto.

Embodiment 1

In this embodiment, a method for generating system information running in the network architecture is provided. FIG. 2 is a flowchart of a method for generating system information according to an embodiment of the present application. As shown in FIG. 2, the process includes step S202. And step S204.

In step S202, the central unit CU generates CU system information, wherein the CU system information does not allow to carry the bits of the distributed unit DU system information.

In step S204, the CU system information is transmitted to the DU, wherein the CU and the DU belong to the first communication node.

In the above embodiment, when the CU only generates the CU system information, the CU does not carry the information such as the bit of the DU system information for the DU to fill, that is, the CU does not need to pay attention to the DU side.

In an embodiment, where the CU does not have CU system information that can be generated, the CU system information is empty in the portion of the system information.

In an embodiment, the generating, by the CU, the CU system information comprises: the CU performing ASN.1 encoding on the CU system information to form an ASN.1 code stream of the CU system information.

According to another embodiment of the present application, a method for generating system information is provided, including the following steps: Step 1: The distributed unit DU receives CU system information transmitted by the central unit CU, where the CU system information is not allowed to be carried. The bits of the distributed unit DU system information. Step 2: the DU generates DU system information; the DU performs one of the following steps: forming system information according to at least one of the CU system information and the DU system information, transmitting the system information to the second communication node; and the DU Transmitting at least one of the CU system information and the DU system information to the second communication node, respectively; wherein the CU and the DU belong to the first communication node.

In an embodiment, where there is no DU system information that can be generated for the DU, the portion of the system information regarding the DU system information is empty.

In an embodiment, after receiving the ASN.1 code stream of the CU system information transmitted by the CU, the method further includes: the DU according to at least one of the ASN.1 code stream of the CU system information and the DU system information. Forming system information, transmitting the system information to the second communication node; or, the DU transmitting at least one of the ASN.1 code stream and the DU system information of the CU system information to the second communication node, respectively.

According to another embodiment of the present application, a method for generating system information is further provided, including the following steps: Step 1: The first communication node generates at least one of a centralized unit CU system information and/or a distributed unit DU system information. . Step 2: Obtain system information according to at least one of the CU system information and the DU system information. In step three, the system information is transmitted to the second communication node.

In an embodiment, the first communication node generates at least one of CU system information and DU system information, including at least one of: generating, by the centralized unit CU of the first communication node, the CU system information; A distributed unit DU of a communication node generates the DU system information.

According to another embodiment of the present application, a method for generating system information is provided, including the following steps: a second communication node receives system information transmitted by a first communication node; wherein the system information includes at least one of the following: The centralized unit CU of the first communication node generates CU system information, and the distributed unit DU of the first communication node generates DU system information.

In an embodiment, the second communication node respectively receives the CU system information and the DU system information sent by the first communication node.

In an embodiment, the execution body of the foregoing steps may be a base station or the like, but is not limited thereto.

In an embodiment, in the case that the CU does not have at least one of the CU system information that can be generated and the DU system information that the DU does not exist, the system information includes at least one of the CU system information and the DU system information. One part is empty.

In an embodiment, the system information is obtained according to at least one of the CU system information and the DU system information, the method further comprising: the DU forming system information according to at least one of the DU system information and the CU system information.

In an embodiment, the generating, by the CU, the CU system information by the first communication node concentrating unit includes: the CU performs ASN.1 encoding on the CU system information to form an ASN.1 code stream of the CU system information.

In an embodiment, after forming the ASN.1 code stream of the CU system information, the method further includes: the DU forming system information according to at least one of the ASN.1 code stream and the DU system information, and transmitting the system information. Up to the second communication node; or the DU transmits at least one of the ASN.1 code stream and the DU system information of the CU system information to the second communication node, respectively.

According to another embodiment of the present application, there is also provided a method for generating system information running on a second communication node, comprising the following steps: Step 1: The second communication node receives system information transmitted by the first communication node. Step 2, wherein the system information is generated by: the first communication node generating at least one of a centralized unit CU system information and distributed unit DU system information; and at least one of the CU system information and the DU system information A method of obtaining the system.

In an embodiment, the CU system information is generated by the first communication node CU; the DU system information is generated by the first communication node DU.

According to another embodiment of the present application, a method for generating system information is further provided, the method comprising the following steps: Step 1: The centralized unit CU of the first communication node generates CU system information. Step two, transmitting the CU system information to the distributed unit DU of the first communication node.

In an embodiment, the generating, by the CU, the CU system information by the central unit CU of the first communication node includes: the CU performs ASN.1 encoding on the CU system information to form an ASN.1 code stream of the CU system information.

According to another embodiment of the present application, a method for generating system information is further provided, including: Step 1: The distributed unit DU of the first communication node receives the CU system information transmitted by the central unit CU.

In step two, the DU generates DU system information. Step 3: The DU performs one of the following steps: forming system information according to at least one of the CU system information and the DU system information, transmitting the system information to the second communication node; and transmitting, by the DU, the CU system information and At least one of the DU system information to the second communication node.

It should be added that, when there is no CU system information that can be generated by the CU, the CU system information of the CU transmission received by the DU may be empty, that is, the DU receives the CU system information that is empty in the above step 1. Of course, if the DU does not have the DU system information that can be generated, the part of the system information about the DU system information is empty.

The details are described below in conjunction with the exemplary embodiments of the present application.

This application solves the shortcomings of the related system information transmission scheme in the CU-DU separation scenario of the base station, and proposes a better system information transmission method.

After the 5G NR separates the base station CU from the base station DU, the functional responsibilities of the base station CU and the base station DU are also separated. The base station CU deploys the functions of the air interface RRC and PDCP protocol layers, and the content that is not related to the RRC and PDCP protocol layers in the air interface should also be independent of the base station CU.

For system information, RRC is concerned with the high-level configuration of the base station system. As for the system information, a field similar to SFN, which is strongly related to MAC scheduling, has a large frequency of change, and has high real-time requirements, should not be concerned by the RRC protocol layer.

So now, the system information can be broken down into RRC-related parts, as well as MAC-related parts. In the CU-DU separate deployment of the base station, the RRC is located in the base station CU, and the MAC is located in the base station DU, so that the system information can be generated by the base station CU and the base station DU, and then combined and delivered.

Therefore, the main contents of the present application are: system information is split according to the protocol stack, system information belonging to the CU protocol stack of the base station is CU system information, system information belonging to the base station DU protocol stack is DU system information; system information is determined by the CU system. Information and DU system information. When there is no configuration information related to the base station DU, the DU system information part in the system information is empty; when there is no configuration information related to the base station CU, the CU system information part in the system information is empty; the CU system information is The base station CU generates a bit stream that is encoded by the base station CU into a specific format; the DU system information is generated by the base station DU, and is encoded by the base station DU into a bit stream of a specific format; the base station CU transmits the CU system information bit stream to the base station DU, and the base station DU is responsible for The CU system information bit stream and the DU system information bit stream are assembled. The base station DU does not care about the content of the CU system information bit stream. If one of the CU system information and the DU system information is empty, the assembly does not need to be assembled, and the CU system can be independently issued. Information or DU system information.

The system information is independently decoupled between the base station CU and the base station DU. When the base station CU generates the CU system information, it does not need to know any system information content of the base station DU. The base station CU sends the encoded bit stream to the base station DU, which is not specific. The content of the system information field, when the base station DU generates the DU system information, does not need to care about the specific content of the base station CU system information.

The following is an exemplary embodiment of an embodiment of the present application.

It should be noted that the main information block MIB involved in the exemplary embodiments 1, 2, and 3 is an embodiment of the system information described in the application file, and the system information in the 5G system may also be in the LTE system. The structure of the MIB, however, is not limited to the MIB structure in the related art. That is, the technical solution of the present application can be applied to MIB of the LTE system, system information such as SIB1, or system information such as MIB and SIB1 of the 5G system, and can also be applied to system information generation of the remaining mobile communication systems except the above two. .

Example Embodiment 1 (issuance of system information MIB)

Referring to the Long Term Evolution (LTE) system, the main information block MIB has information configured by the radio resource control RRC, such as system bandwidth, and also information configured by the MAC, such as a single frequency network (SFN). Therefore, in the present application, the MIB is split into two separate parts, namely CU system information configured by RRC and DU system information configured by MAC.

FIG. 3 is a schematic flowchart of a system information MIB delivered according to Embodiment 1. As shown in FIG. 3, the process includes steps S301 to S305.

In step S301, the base station CU performs cell assignment of the CU system information in the MIB message according to the RRC protocol, and performs ASN.1 coding to form an ASN.1 code stream of the MIB CU system information.

In step S302, the base station CU transmits the CU system information ASN.1 code stream of the MIB to the base station DU.

In step S303, the base station DU prepares to schedule the delivery of the MIB message, and the base station DU fills the DU system information bitstream that generates the MIB according to the format agreed in the MAC layer protocol and the terminal.

In step S304, the base station DU is spliced (may not be spliced, two parts are independently delivered, and the mode is not constrained). The DU system information bit stream of the MIB and the CU system information ASN.1 code stream form a completed MIB system. information. 4 is a schematic diagram of complete MIB system information according to Embodiment 1. As shown in FIG. 4, the MIB system information includes a DU system information bit stream, and a CU system information ASN.1 code stream.

In step S305, the base station DU delivers MIB system information.

Example Embodiment 2 (issuance of system information SIB1)

Referring to LTE, there is only information configured by RRC in SIB1, and there is no information configured by the MAC. Therefore, in this application, SIB1 has only independent CU system information.

FIG. 5 is a schematic flowchart of sending SIB1 information according to Embodiment 2, as shown in FIG. 5, including steps S501 to S503.

In step S501, the base station CU performs cell assignment of the CU system information in the SIB1 message, and performs ASN.1 coding to form an ASN.1 code stream of the SIB1CU system information.

In step S502, the base station CU transmits the CU system information ASN.1 code stream of the SIB1 to the base station DU.

In step S503, since the DU system information does not exist in the SIB1, the DU system information part is empty, and the base station DU directly schedules the delivery of the SIB1 including only the CU system information. 6 is a schematic diagram of SIB1 system information according to Embodiment 2. As shown in FIG. 6, the SIB1 system information includes a CU system information ASN.1 code stream.

Example embodiment 3

The scheme of splitting the system information into the CU system information and the DU system information is also applicable to the base station without CU-DU separation. The transmission of the LTE MIB system information is taken as an example. FIG. 7 is a schematic flowchart of information transmission of the MIB system according to Embodiment 3, as shown in FIG. 7, including steps S701 to S704.

In step S701, the base station performs cell assignment of the CU system information in the MIB message according to the RRC protocol, and performs ASN.1 coding to form an ASN.1 code stream of the MIB CU system information.

In step S702, the base station prepares to schedule the delivery of the MIB message, and the base station fills the DU system information bit stream that generates the MIB according to the format agreed in the MAC layer protocol and the terminal.

In step S703, the base station is spliced (may not be spliced, two parts are independently delivered, and the mode is not constrained). The DU system information bit stream of the MIB and the CU system information ASN.1 code stream form a completed MIB system information. (As shown in Figure 4).

In step S704, the base station sends MIB system information.

With the above technical solution, after the base station CU-DU is separated, the base station CU no longer cares about the system information that the base station DU needs to be configured, and the base station DU does not care about how to modify the system information sent by the base station CU. The base station CU and the base station DU system information are independently generated.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware. Based on such understanding, the technical solution of the present application may be embodied in the form of a software product in essence or in a form of a software product stored in a storage medium such as a read-only memory/random memory (Read Only Memory/Random Access Memory (ROM/RAM), a magnetic disk, and an optical disk include instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform each embodiment of the present application. The method described.

Embodiment 2

In the embodiment, a device for generating system information is provided, which is configured to implement the above-mentioned embodiments and example embodiments, and details have been omitted for description. As used below, the term "module" may implement a combination of at least one of software and hardware for a predetermined function. The apparatus described in the following embodiments may be implemented in software, but hardware, or a combination of software and hardware, is also possible and conceivable.

According to another embodiment of the present application, there is also provided a device for generating system information applied to a first communication node, comprising the following modules:

Generating a module, configured to generate at least one of centralized unit CU system information and distributed unit DU system information;

And an acquiring module, configured to acquire system information according to at least one of the CU system information and the /DU system information; and the transmitting module is configured to transmit the system information to the second communication node.

It should be noted that the method step embodiments executed by the first communication node or the base station side in the first embodiment can be performed by the above-mentioned system information generating apparatus applied to the first communication node.

According to another embodiment of the present application, a device for generating system information applied to the foregoing second communication node is further provided, including:

a receiving module, configured to receive system information transmitted by the first communications node; wherein the system information is generated by: the first communications node generating at least one of a centralized unit CU system information and distributed unit DU system information Obtaining the system information according to at least one of the CU system information and the DU system information.

It should be noted that the method step embodiments executed by the second communication node or the terminal side in the first embodiment can be performed by the above-mentioned system information generating apparatus applied to the second communication node.

It should be noted that the foregoing multiple modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the multiple modules are The form of any combination is located in a different processor.

Embodiment 3

According to another embodiment of the present application, a base station is further provided. FIG. 8 is a hardware structural diagram of a base station according to an embodiment of the present application. As shown in FIG. 8, the base station 80 includes a central unit CU 802 and a distributed unit DU 804.

The central unit CU 802 is configured to generate centralized unit CU system information, wherein the CU system information is not allowed to carry bits of the distributed unit DU system information; and the CU system information is transmitted to the DU.

a distributed unit DU 804, connected to the central unit 802, configured to receive CU system information transmitted by the CU; and configured to perform one of the following steps: forming system information according to at least one of the CU system information and the DU system information Transmitting the system information to the second communication node; and the DU transmitting at least one of the CU system information and the DU system information to the second communication node, respectively; wherein the CU and the DU belong to the A communication node.

The above two can be in a separated state, or in an independent running state, or can be set inside the base station.

According to another embodiment of the present application, there is also provided a centralized unit CU802, comprising: a first processor configured to generate CU system information, wherein the CU system information does not allow bits carrying distributed unit DU system information a first communication device arranged to transmit the CU system information to the DU 804, wherein the CU 802 and the DU 804 are attributed to the first communication node.

According to another embodiment of the present application, there is further provided a distributed unit DU 804, comprising: a second communication device, configured to receive CU system information transmitted by the central unit CU 802, wherein the CU system information is not allowed to carry distributed a bit of unit DU system information; a second processor configured to generate DU system information;

The second processor is further configured to perform one of the following steps: forming system information according to at least one of the CU system information and the DU system information, and transmitting the system information to a second communication node; The DU transmits at least one of the CU system information and the DU system information to the second communication node, respectively; wherein the CU 802 and the DU 804 are attributed to the first communication node.

Embodiment 4

Embodiment 5

It should be understood by those skilled in the art that each module or each step of the above application may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed among multiple computing devices. online. For example, they may be implemented in program code executable by a computing device such that they may be stored in a storage device for execution by a computing device and, in some instances, may be performed in a different order than that illustrated herein. Or the steps described. They can be fabricated separately into a plurality of integrated circuit modules, or a plurality of modules or steps thereof can be implemented as a single integrated circuit module. Thus, the application is not limited to any particular combination of hardware and software.

Claims

A method for generating system information, including:

The central unit CU generates CU system information, wherein the CU system information does not allow to carry the bits of the distributed unit DU system information;

Transmitting the CU system information to the DU, wherein the CU and the DU are attributed to the first communication node.
The method of claim 1, wherein in the case where the CU does not have CU system information that can be generated, the CU system information is empty in a portion of the system information.
The method according to claim 1, wherein the generating, by the central unit CU, the CU system information comprises:

The CU performs ASN.1 encoding on the CU system information to form an ASN.1 code stream of CU system information.
A method for generating system information, including:

The distributed unit DU receives the CU system information transmitted by the central unit CU, wherein the CU system information does not allow the bit of the distributed unit DU system information to be carried;

The DU generates DU system information, wherein the CU and the DU are attributed to the first communication node.
The method of claim 4, wherein after the DU generates DU system information, the DU performs one of the following steps:

Forming system information according to at least one of the CU system information and the DU system information, transmitting the system information to a second communication node;

The DU transmits at least one of the CU system information and the DU system information to the second communication node, respectively.
The method according to claim 5, wherein in the case where the DU does not have the DU system information that can be generated, the portion of the system information regarding the DU system information is empty.
The method of claim 5, after receiving the ASN.1 code stream of the CU system information transmitted by the CU, the method further includes:

The DU forms system information according to at least one of an ASN.1 code stream of the CU system information and the DU system information, and transmits the system information to the second communication node; or

The DU transmits at least one of an ASN.1 code stream and DU system information of the CU system information to the second communication node, respectively.
A method for generating system information, including:

The first communication node generates at least one of centralized unit CU system information and distributed unit DU system information;

Obtaining system information according to at least one of the CU system information and the DU system information;

Transmitting the system information to a second communication node.
The method of claim 8, wherein the first communication node generates at least one of CU system information and DU system information, including at least one of the following:

Generating the CU system information by the central unit CU of the first communication node;

The DU system information is generated by the distributed unit DU of the first communication node.
A method for generating system information, including:

Receiving, by the second communication node, system information transmitted by the first communication node;

The system information includes at least one of: a centralized unit CU of the first communication node generates CU system information; and a distributed unit DU of the first communication node generates DU system information.
The method of claim 10, wherein the second communication node receives CU system information and DU system information transmitted by the first communication node, respectively.
A centralized unit CU comprising:

a first processor, configured to generate centralized unit CU system information, wherein the CU system information is not allowed to carry bits of the distributed unit DU system information;

The first communication device is configured to transmit the CU system information to the DU, wherein the CU and the DU are attributed to the first communication node.
A distributed unit DU comprising:

a second communication device, configured to receive CU system information transmitted by the central unit CU, where the CU system information is not allowed to carry a bit of the distributed unit DU system information;

The second processor is configured to generate DU system information, wherein the CU and the DU are attributed to the first communication node.
A distributed unit DU according to claim 13, wherein said second processor is further arranged to perform one of the following steps:

Forming system information according to at least one of the CU system information and the DU system information, transmitting the system information to a second communication node;

The DU transmits at least one of the CU system information and the DU system information to the second communication node, respectively.
A storage medium comprising a stored program, wherein the program is executed to perform the method of any of the preceding claims 1 to 11.
A processor, the processor being arranged to run a program, wherein the program is executed to perform the method of any of the preceding claims 1 to 11.