WO2022001483A1

WO2022001483A1 - Information sending method, nr cell access method, access network device, mobile terminal, and storage medium

Info

Publication number: WO2022001483A1
Application number: PCT/CN2021/095564
Authority: WO
Inventors: 潘文吉
Original assignee: 中兴通讯股份有限公司
Priority date: 2020-06-28
Filing date: 2021-05-24
Publication date: 2022-01-06
Also published as: CN113853004A

Abstract

An information sending method, an NR cell access method, an access network device, and a mobile terminal. The information sending method comprises: acquiring first configuration information of a plurality of first PLMNs that share an NR cell, wherein the first configuration information is used for determining whether a first PLMN is a target PLMN that does not support a network slice (310); generating access restriction information of the target PLMN according to the first configuration information, wherein the access restriction information is used for restricting a user equipment (UE) that supports a stand alone (SA) service from accessing the target PLMN (320); and broadcasting the access restriction information to the UE (330).

Description

Information sending method, NR cell access method, access network equipment, mobile terminal and storage medium

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on the Chinese patent application with the application number of 202010597990.7 and the filing date of June 28, 2020, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is incorporated herein by reference.

technical field

The embodiments of the present application relate to the field of wireless communication technologies, and in particular, to a method for sending information, a method for accessing an NR cell, an access network device, a mobile terminal, and a storage medium.

Background technique

With the advancement of communication technology, the fifth generation (5th Generation, 5G) system, such as a new generation of radio access technology (new radio access technology, NR), will be the mainstream communication technology for a period of time in the future. Among them, the 5G system includes non-independent networking NSA (Non-Stand alone) and independent networking SA (Stand alone). With the popularization and development of 5G technology, the 5G system will gradually transition from NSA networking to SA networking. In order to enable NSA users who have already joined the network to continue to experience 5G, SA cells can be configured to support NSA users.

The public land mobile network PLMN (Public Land Mobile Network) can provide wireless network services for NSA and SA users. NSA carries NR system messages through 4G cells, and SA broadcasts system messages through NR cells. If the two NR cells, NSA/SA, are constructed separately, two sets of cell logic resources will be occupied, and they will cover the same sector at the same time, resulting in low resource utilization. Therefore, a 5G mixed-mode cell has emerged, that is, a cell with a hybrid NSA/SA network. The 5G base station in this cell supports both NSA and SA protocol stacks, and works simultaneously in the same SA cell. In the NSA/SA hybrid networking, the NR cell of NSA and the NR cell of SA are actually covered by the same logical cell and share the cell ID. The logical cell provides access services for NSA and SA users at the same time. NSA and SA users All resources of the logical cell are shared.

The PLMN of the SA cell needs to be configured with network slices and needs 5G core network support, while the PLMN of the NSA cell does not need to configure network slices and only needs 4G core network support. In a 5G mixed-mode cell, NSA's PLMN will also be broadcast to SA users, which will cause SA users to access NSA's PLMN. Since NSA's NR cell does not provide SA service configuration, it will cause service failure or confusion. , the communication quality of the system.

SUMMARY OF THE INVENTION

The present application provides an information sending method, an NR cell access method, an access network device, a mobile terminal and a computer storage medium.

In a first aspect, an embodiment of the present application provides a method for sending information, which is applied to a distributed unit DU. The method includes: acquiring first information of multiple first public land mobile network PLMNs sharing a new generation radio access technology NR cell. configuration information, where the first configuration information is used to determine whether the first PLMN is a target PLMN that does not support network slicing; the access restriction information of the target PLMN is generated according to the first configuration information, the access restriction The information is used to restrict the user equipment UE that supports the independent networking SA service from accessing the target PLMN; broadcast the access restriction information to the UE.

In a second aspect, an embodiment of the present application provides a method for sending information, which is applied to a communication system, where the communication system includes a centralized unit CU and a distributed unit DU, and the method includes: the DU acquires a plurality of shared NR cells First configuration information of the first PLMN, where the first configuration information is used to determine whether the first PLMN is a target PLMN that does not support network slicing; the DU sends the first configuration information to the CU according to the first configuration information message, where the first message includes network slice configuration information of multiple first PLMNs; the CU determines, according to the first message, a first PLMN list of the target PLMN and a second list of PLMNs supporting network slicing PLMN list; the CU sends first connection information to the 5G core network, where the first connection information includes the second PLMN list; the CU obtains the first connection feedback information from the 5G core network, the first connection information A connection feedback information includes the list of the second PLMN, the first available PLMN list supported by the 5G core network; the CU sends a second message to the DU, and the second message includes the first available PLMN list ; the DU generates the access restriction information of the target PLMN according to the first configuration information, the access restriction information is used to restrict the user equipment UE supporting the independent networking SA service from accessing the target PLMN; the The DU sends cell broadcast information to the UE, where the cell broadcast information includes the access restriction information and PLMN access information used to inform the UE that the current NR cell supports PLMN, and the PLMN access information includes the first available PLMN list and the first PLMN list.

In a third aspect, an embodiment of the present application provides an NR cell access method, which is applied to a mobile terminal. The method includes: acquiring access restriction information sent by a distributed unit DU, where the access restriction information is the DU according to It is sent by the information sending method described in the first aspect of the embodiment of this application; the NR cell where the PLMN accesses the DU is selected according to the access restriction information.

In a fourth aspect, an embodiment of the present application provides an access network device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program At the same time, the information sending method described in the first aspect of the embodiment of the present application is implemented.

In a fifth aspect, an embodiment of the present application provides a mobile terminal, including a memory, a processor, and a computer program stored in the memory and running on the processor, where the processor executes the computer program to achieve the same implementation as the present application Example of the NR cell access method described in the third aspect.

In a sixth aspect, an embodiment of the present application provides a communication system, where the communication system includes a centralized unit CU and a distributed unit DU, the DU obtains first configuration information of multiple first PLMNs sharing an NR cell, the The first configuration information is used to determine whether the first PLMN is a target PLMN that does not support network slicing; the DU sends a first message to the CU according to the first configuration information, where the first message includes multiple The network slice configuration information of the first PLMN; the CU determines the first PLMN list of the target PLMN and the second PLMN list of the PLMN supporting network slice according to the first message; The CU sends to the 5G core network first connection information, the first connection information includes the second PLMN list; the CU obtains first connection feedback information from the 5G core network, the first connection feedback information includes the second PLMN In the list, the first available PLMN list supported by the 5G core network; the CU sends a second message to the DU, where the second message includes the first available PLMN list; the DU is based on the first configuration information generating access restriction information of the target PLMN, where the access restriction information is used to restrict the user equipment UE supporting the SA service of independent networking from accessing the target PLMN; the DU sends cell broadcast information to the UE, and the cell The broadcast information includes the access restriction information and PLMN access information for informing the UE that the current NR cell supports PLMN, and the PLMN access information includes the first available PLMN list and the first PLMN list.

In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium that stores computer-executable instructions, where the computer-executable instructions are used to execute the information sending method described in the first aspect of the embodiment of the present application, or as The NR cell access method according to the third aspect of the embodiments of the present application.

Description of drawings

1 is a schematic structural diagram of a system architecture provided by the application;

2 is a schematic diagram of an architecture of an NSA/SA hybrid networking provided by an embodiment of the present application;

3 is a method flowchart of a method for sending information provided by an embodiment of the present application;

Fig. 4 is the concrete method flow chart of step 320 in Fig. 3;

5 is a method flow chart of a method for sending information provided by an embodiment of the present application;

6 is a method flow chart of a method for sending information provided by an embodiment of the present application;

7 is a method flow chart of a method for sending information provided by an embodiment of the present application;

FIG. 8 is a method flowchart of a method for sending information provided by an embodiment of the present application;

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

FIG. 10 is a method flowchart of applying for an NR cell access method provided by an embodiment;

11 is a schematic flowchart of an initial establishment of cell activation provided by an embodiment of the present application;

FIG. 12 is a schematic flowchart of modifying a PLMN provided by an embodiment of the present application;

13 is a system block diagram of an access network device provided by an embodiment of the present application;

FIG. 14 is a system block diagram of a mobile terminal provided by an embodiment of the present application.

detailed description

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

It should be noted that although the functional modules are divided in the schematic diagram of the device, and the logical sequence is shown in the flowchart, in some cases, the modules may be divided differently from the device, or executed in the order in the flowchart. steps shown or described. The terms "first", "second" and the like in the description and claims and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

The 5G system includes non-independent networking NSA (Non-Stand alone) and independent networking SA (Stand alone). Referring to the architecture diagram of the NSA/SA hybrid networking of an exemplary embodiment shown in FIG. 1, it includes a 4G base station and a 5G dual-mode base station, wherein the 5G dual-mode base station is connected to the 5G core network through a next generation NG (next generation) interface To achieve SA networking, the 5G dual-mode base station communicates with the 4G base station through the X2 interface (the interface between the base station and the base station in the LTE system), and the S1-U interface (the S1-U interface is the connection between the base station and the 4G core network in the LTE system). The 4G base station is connected to the 4G core network through S1-C/U (the S1-C/U interface is the communication interface that establishes the user plane and control panel connection between the base station and the 4G core network in the LTE system) interface) is connected to the 4G core network, so that the 5G dual-mode base station and the 4G base station constitute the NSA networking, the public land mobile network PLMN (Public Land Mobile Network) can provide wireless network services for NSA and SA users, and NSA carries NR through 4G cells System messages, SA broadcasts system messages through the NR cell itself. If the two NR cells, NSA/SA, are constructed separately, two sets of cell logic resources will be occupied, and they will cover the same sector at the same time, resulting in low resource utilization.

In this regard, in the NSA/SA hybrid networking architecture shown in Figure 1, the 5G dual-mode base station in this cell supports both NSA and SA protocol stacks, and works simultaneously in the same SA cell. The NR cell of the NSA and the NR cell of the SA are actually covered by the same logical cell and share the cell ID. The logical cell provides access services for both the NSA and SA users, and the NSA and SA users share all the resources of the logical cell. For example, the elliptical area indicated by the dotted line in FIG. 1 is the LTE cell, and the elliptical area indicated by the solid line is the NR cell. For SA users (or user terminals UE that support SA services), by accessing the NR cell, the communication is performed in the SA mode. The internet. For NSA users (or UEs supporting NSA services), signaling communication with 4G base stations is realized through LTE cells, and data communication with 5G dual-mode base stations is realized through NR cells, realizing NSA model access to the communication network.

The 5G dual-mode base station supports multiple PLMNs to share one NR cell, which can solve the problem of low resource utilization and reduce the cost of network equipment. For SA PLMNs, network slices need to be configured and 5G core network support is required, while NSA cell PLMNs do not need to configure network slices and only need 4G core network support. That is, the PLMN of the NSA service does not support all the functions of the SA networking, but in the same NR cell, the NSA PLMN will also be broadcast to the SA users, which will cause the SA users to access the NSA PLMN. The cell does not provide the configuration of the SA service. For example, the PLMN of the NSA does not support the network slicing service, which will cause service failure or confusion, and the call drop rate of the system is high.

Therefore, the embodiments of the present application provide an information sending method, an NR cell access method, an access network device, a mobile terminal, and a computer storage medium, which can prevent SA users from accessing the NSA's PLMN and improve communication quality.

Referring to FIG. 2 , it is a networking structure to which the method provided by the embodiment of the present application is applicable, and FIG. 12 shows a 5G networking. Under the cloud radio access network (Cloud RAN) architecture, the RAN base station is separated into two components, the centralized unit CU (centralized unit) and the distributed unit DU (distributed unit). The interface can be called the F1 interface. Under the Cloud RAN architecture, the data packets sent by the UE arrive at the DU of the 5G dual-mode base station out of sequence through the NR air interface. The DU of the 5G dual-mode base station forwards the out-of-order data packets to the CU of the 5G dual-mode base station through the F1 interface, and the CU pair receives it. The packets are reordered.

Referring to FIG. 3 , an information sending method provided by an exemplary embodiment of the present application is applied to a DU as shown in FIG. 2 , and the method includes the following steps:

Step 310: Obtain first configuration information of multiple first PLMNs sharing an NR cell, where the first configuration information is used to determine whether the first PLMN is a target PLMN that does not support network slicing.

In this step, the NR cell is a cell in a hybrid NSA/SA network, and multiple PLMNs share the NR cell. Since different UEs may be covered by different NR cells of different base stations in the actual environment, in this embodiment, for sharing such as The multiple PLMNs of the NR cell of one DU shown in FIG. 2 are all called the first PLMN. For example, if there are three PLMNs sharing the NR cell, there are three first PLMNs. The DU sends the cell broadcast information by broadcasting. When the UE starts up or switches from the standby state to the active state within the coverage of the cell, it will select the PLMN for access according to the cell broadcast information. Usually, the UE will determine each PLMN according to the information of the cell broadcast signal. Measure at the frequency point of 1, and select the PLMN with the strongest signal to access according to the measurement result. Because the DM is responsible for establishing and maintaining each PLMN in the NR cell. Therefore, the DM will know the configuration information of each PLMN in the cell in advance. The configuration information can be set by engineers or maintenance personnel, or set according to the instructions of the core network or other base stations or servers, or it can be set in advance. Rule, the configuration information automatically generated or adjusted according to the operation of the base station, correspondingly, the configuration information of multiple first PLMNs sharing the NR cell in this step is the first configuration information, and each first PLMN has corresponding configuration information , the configuration information may include a variety of configurations corresponding to the PLMN, such as the PLMN identity, the cell identity, the working frequency band, or the configuration of the scheduling message of the system message block SIB, and the first configuration information in this embodiment is whether the PLMN supports network slicing. Configuration, the core requirement of network slicing (slice) for the bearer network is that different network slices need their own bearer sub-networks. Soft isolation approximates the effect of hard isolation. Since the packet network cannot support hard isolation, in order to support the requirements of 5G network slicing, the packet network needs to divide the underlying network resources into slices to meet the needs of different upper-layer services.

For a PLMN that supports SA services, there is a network slice configuration. For a PLMN that supports NSA services, there is no network slice configuration, or the network slice configuration is empty. According to the first configuration information, it is possible to distinguish which PLMNs support SA services and which PLMNs do not support SA services. For PLMNs supporting SA services, the first configuration information supports network slicing, and for NSA PLMNs that do not support SA services, the first configuration The information does not support network slicing, and these PLMNs that do not support SA services are the target PLMNs. Through the first configuration information of the PLMN, it can be known which PLMNs are configured with network slices, and the PLMNs without network slices are configured as target PLMNs.

Step 320: Generate access restriction information of the target PLMN according to the first configuration information, where the access restriction information is used to restrict the user equipment UE supporting the independent networking SA service from accessing the target PLMN.

Since the UE will obtain the frequency points of each first PLMN according to the cell broadcast information and select the corresponding PLMN for access according to the distribution network strategy, generally the strategy is to use the PLMN with the strongest signal to access the NR cell. Therefore, it is only necessary to broadcast the access restriction information of the target PLMN to the UE in combination with this policy, and theoretically, the PLMN selection of the UE can be controlled. For example, the access restriction information can change the measurement threshold of the SA user, so that it cannot access the PLMN of the NSA service. In addition, in the 5G communication system, the SIB1 message of the cell broadcast message includes the universal access control UAC field, and the UAC can control the UE to access the PLMN. Therefore, in an embodiment, the UAC field in the SIB1 message can be configured according to the target PLMN. , so that the UE supporting the SA service ignores or prohibits access to the target PLMN when selecting a PLMN. The UAC field includes the UAC public restricted PLMN list: uac-BarringperPLMN-List, the target PLMN can be written into the uac-BarringperPLMN-List, for example, the target PLMN forms the first PLMN list and is written into the uac-BarringperPLMN-List to restrict SA The user accesses the target PLMN in the first PLMN list, and there is also a control identifier corresponding to the first PLMN list. For example, in an embodiment, the UAC field also includes a UAC barring access factor corresponding to each item in the uac-BarringperPLMN-List: uac -BarringFactor, represented by PX (PX1, PX2...PXn), where X ranges from 0 to 100, and PX represents the access probability of the corresponding target PLMN. For example, P10 represents the access probability of 10%, and this embodiment In order to prevent SA users from accessing the target PLMN, the uac-BarringFactor corresponding to each target PLMN in the uac-BarringperPLMN-List is set to P00, indicating that the access probability is 0. Since the UAC field is configured for the 5G access environment, the above configuration will not affect the NSA user's access to the target PLMN.

Step 330, broadcast the access restriction information to the UE.

In this step, the DU broadcasts the access restriction information to the UE through the cell broadcast information, for example, broadcasts the access restriction information to the UE through the above-mentioned SIB1 message. After the UE receives the cell broadcast information, the selection of the PLMN is completed according to the SIB1 message. Since the access restriction information is set in the SIB1 message, the SA user will not access the target PLMN cell according to the access restriction information.

An information sending method provided by an embodiment of the present application, by acquiring the first configuration information of a plurality of first public land mobile networks PLMNs that share a new generation radio access technology NR cell, so as to determine that the current shared NR cell PLMN does not support the network Sliced target PLMNs, these target PLMNs only support the NSA service in the NR cell of the NSA/SA hybrid networking, and do not fully support the SA service. Generate access restriction information corresponding to the target PLMN according to the first configuration information, and broadcast the access restriction information to the UE, so that the UE selects a PLMN for accessing the NR cell according to the access restriction information. The target PLMN that fully supports the SA service, therefore, the UE that supports the SA service will not select the target PLMN for access according to the access restriction information, so it can avoid the service failure or confusion caused by the user of SA accessing the PLMN of the NSA. Improve communication quality.

In one embodiment, as shown in FIG. 4 , the step 320 includes the following steps:

Step 410: Determine the first PLMN list of the target PLMN according to the first configuration information.

In this step, the DU knows whether each first PLMN supports network slicing according to the first configuration information of each first PLMN sharing the NR cell, so it can filter out the target PLMN from the set of each first PLMN to form the first PLMN list , the first PLMN list may be an empty set, for example, all first PLMNs support network slicing, and the first PLMN list or the following other PLMN lists may be represented in different ways, such as through a number set, an arrangement order table, a matrix, etc. It is possible to express in the form.

Step 420: Add the first PLMN list to the PLMN control list, and configure the control identifier corresponding to the first PLMN list to restrict access.

In this step, the cell broadcast information to be broadcast to the UE includes a PLMN control list and a control identifier corresponding to each element in the PLMN control list. For example, in one embodiment, the PLMN control list is the UAC field in SIB1, the uac-BarringperPLMN-List in the UAC field is in the PLMN control list, and the UACuac-BarringFactor corresponding to each item in the uac-BarringperPLMN-List is the control identifier. By writing the first PLMN list in step 410 into the uac-BarringperPLMN-List, and configuring the UACuac-BarringFactor corresponding to each target PLMN to restrict access, that is, setting the UACuac-BarringFactor to P00, indicating that the access to the PLMN is The probability is 0. Since the UAC field is configured for the 5G access environment, the above configuration will not affect the NSA user's access to the target PLMN, but it can prevent the SA user from accessing the target PLMN that does not support slicing.

Referring to the network architecture shown in Figure 2, the DU sends PLMN access information to the UE through cell broadcast information to inform the UE of the PLMNs that can be selected, and the UE completes the PLMN selection and access to the NR cell according to the PLMN access information. In the 5G communication standard, for the PLMN that supports the SA service, it needs to be confirmed that it can be supported by the 5G core network before broadcasting to the UE. In some cases in the art, when networking is established, an NG connection is established between the CU and the 5G core network, the CU will send an NG establishment request to the 5G core network, and the 5G core network will feed back information about all the PLMNs it supports. In addition, the DU will send a list of all PLMNs it supports to the CU. The CU determines the list of PLMNs supported by the 5G core network by comparing the PLMN list sent by the DU with the support list fed back by the 5G core network. The list is fed back to the DU, and the DU broadcasts according to the PLMN list. It can be seen that the current communication mechanism is not suitable for NSA/SA hybrid networking. According to the existing mechanism, the CU will also send the NSA's PLMN to the 5G core network, even if the PLMN is obviously not supported by the 5G core network. This leads to useless transmission of signals and waste of resources.

In one embodiment, referring to FIG. 5 , before step 330, the following steps are further included:

Step 510: Send a first message to the CU, where the first message includes network slice configuration information of multiple first PLMNs.

In this step, the DU can send a first message to the CU through the F1 interface, and the first message can be a setup request SETUP REQUEST in the F1 interface, where the SETUP REQUEST includes the network slice configuration field TAI Slice Support List of each PLMN, and the DU Fill in the TAI Slice Support List according to the first configuration information, fill in the TAI Slice Support List for PLMNs with network slice configuration in the first configuration information, and do not fill in the TAI Slice Support List for the target PLMNs without network slice configuration in the first configuration information , leaving it blank.

Step 520: Obtain a second message from the CU, where the second message includes a list of the first available PLMNs supported by the 5G core network among the multiple first PLMNs.

After the CU obtains the first message, the first PLMN list of the target PLMN and the second PLMN list of the PLMN supporting network slicing can be determined from the TAI Slice Support List, and the CU only needs to send the second PLMN list to the 5G core network for confirmation That is, without sending the list of target PLMNs to the 5G core network for confirmation, which can save network resources. The CU feeds back a second message to the DU according to the confirmation result, including the list of the first available PLMNs supported by the 5G core network and the list of target PLMNs . In an embodiment, the second message may also be called an activation message, and is used to activate the PLMN of the DU.

The step 330 includes the following steps:

530. Broadcast the first available PLMN list and the target PLMN list to the UE, so as to inform the NR cell of the PLMNs that the NR cell supports to access.

In this step, the DU updates the first available PLMN list and the target PLMN list into SIB1, and broadcasts it to the UE. The SIB1 also includes the access restriction information described in the above embodiments, such as the UAC field information in the SIB1.

After receiving the second message fed back by the CU, the DU activates the corresponding PLMN according to the first available PLMN list and the target PLMN in the second message, wherein the total PLMN of the first available PLMN list is supported by the 5G core network, in other words, the CU By confirming with the 5G core network, the first available PLMN list supported by the 5G core network is screened from the second PLMN list, or it is understood that the unavailable PLMNs that are not supported by the 5G core network are excluded from the second PLMN list, In this way, the first available PLMN list and the first PLMN list form a set of PLMNs that need to be activated for the current DU. The DU broadcasts the set of PLMNs to the UE to inform the UE of the PLMNs that the current NR cell supports access to. Since the configuration information of the PLMN may be updated, for example, manually or automatically according to the current network environment and network distribution strategy, it is necessary to update the cell broadcast information for the updated configuration information to adapt to the updated network environment.

In one embodiment, referring to FIG. 6, the following steps are also included:

Step 610: Update the first configuration information of the first PLMN to obtain second configuration information.

In this step, the DU updates the first configuration information of the first PLMN, which may be to update the configuration according to the instructions of the staff or maintenance personnel, or the DU automatically updates the configuration information according to the current network environment. The configuration information of one or more first PLMNs can be updated to obtain second configuration information. The format of the second configuration information is consistent with the first configuration information, and the second configuration information is also used to determine whether the first PLMN is It is the target PLMN that does not support network slicing.

Step 620, determining the updated target PLMN according to the second configuration information;

In this step, referring to the description of the above step 310, the DU determines whether each current first PLMN cell is a PLMN supporting the SA service or a PLMN supporting the NSA service according to the description of whether network slicing is supported in the second configuration information. For the network equipment in the SA hybrid networking, the PLMN that supports the SA service and the PLMN that supports the NSA service can be distinguished by the second configuration that supports network slicing. Among the first PLMNs, the first PLMN that does not support network slicing forms the third PLMN. The PLMN list, the first PLMN that supports network slicing forms the fourth PLMN list, therefore, the DU can determine the target PLMN after the updated configuration according to the second configuration information.

Step 630: Generate updated access restriction information of the target PLMN according to the second configuration information.

In this step, after the target PLMN is determined, the access restriction information needs to be updated, and the updated access restriction information is still used to restrict the user equipment UE supporting the independent networking SA service from accessing the target PLMN. For an update method, refer to the above step 320, determine and modify the UAC field in the SIB1 message according to the second configuration information, so that the UE supporting the SA service ignores or prohibits access to the target PLMN when selecting a PLMN. The UAC field includes the UAC public restricted PLMN list: uac-BarringperPLMN-List, the updated third PLMN list can be written into the uac-BarringperPLMN-List, and there is also a control identifier corresponding to the third PLMN list. In the example, the UAC field also includes the UAC barring access factor corresponding to each item in the uac-BarringperPLMN-List: uac-BarringFactor, which is represented by PX (PX1, PX2...PXn), where X ranges from 0 to 100, PX Indicates the access probability corresponding to the target PLMN. For example, P10 indicates that the access probability is 10%. In this embodiment, in order to prevent SA users from accessing the target PLMN, the uac-BarringFactors corresponding to the third PLMN list in the uac-BarringperPLMN-List are all Set to P00, indicating that the access probability is 0. Since the UAC field is configured for the 5G access environment, the above configuration will not affect the NSA user's access to the target PLMN.

Step 640: Broadcast the updated access restriction information of the target PLMN to the UE.

In this step, the updated access restriction information of the target PLMN is broadcast to the UE, for example, broadcast through the SIB1 in the cell broadcast information, where the SIB1 includes the above-mentioned UAC field.

In one embodiment, as shown in FIG. 7 , the following steps are also included:

Step 710: Send a third message to the CU, where the third message includes the updated network slice configuration information of the multiple first PLMNs.

Since the configuration information of the PLMN in the NR cell is updated to the second configuration information, it is necessary to reconfirm whether the updated PLMN is supported by the 5G core network. The DU can send a third message to the CU through the F1 interface, and the third message can be a setup request SETUP REQUEST in the F1 interface, where the SETUP REQUEST includes the network slice configuration field TAISlice Support List of each PLMN, and the DU is based on the second configuration information. Fill in the TAI Slice Support List. For PLMNs with network slice configuration in the second configuration information, fill in the TAI Slice Support List. For the target PLMNs without network slice configuration in the second configuration information, do not fill in the TAI Slice Support List, so that it is blank. fill.

Step 720: Obtain a fourth message from the CU, where the fourth message includes a list of second available PLMNs supported by the 5G core network among the updated multiple first PLMNs.

After the CU obtains the third message, the third PLMN list of the target PLMN and the fourth PLMN list of the PLMNs supporting network slicing can be determined from the TAI Slice SupportList. Knowing all available PLMNs, the CU can filter out the second available PLMN list supported by the 5G core network in the fourth PLMN list. Therefore, the CU feeds back the fourth message to the DU including the second available PLMN list and the third PLMN list supported by the 5G core network. In an embodiment, the fourth message may also be called an activation message, and is used to activate the PLMN of the DU.

Step 730: Broadcast the second available PLMN list and the updated target PLMN list to the UE to inform the NR cell of the PLMNs that the NR cell supports.

In this step, the DU updates the second available PLMN list and the third PLMN list into SIB1, and broadcasts it to the UE. The SIB1 also includes the access restriction information described in the above embodiments, such as the UAC field information in the SIB1.

Referring to FIG. 8 , an embodiment of the present application provides a method for sending information, which is applied to the communication system shown in FIG. 2 , including a centralized unit CU and a distributed unit DU, and the method includes:

Step 810: The DU acquires first configuration information of multiple first PLMNs sharing the NR cell, where the first configuration information is used to determine whether the first PLMN is a target PLMN that does not support network slicing.

In this step, for the PLMN that supports the SA service, there is a configuration of network slice, and for the PLMN of the NSA service, there is no configuration of the network slice, or the configuration of the network slice is empty. According to the first configuration information, the DU can distinguish which PLMNs support SA services and which PLMNs do not support SA services. For PLMNs that support SA services, the first configuration information supports network slicing, and for NSA PLMNs that do not support SA services, the first The configuration information does not support network slicing, and these PLMNs that do not support SA services are the target PLMNs. Through the first configuration information of the PLMN, it can be known which PLMNs are configured with network slices, and the PLMNs without network slices are configured as target PLMNs.

Step 820: The DU sends a first message to the CU according to the first configuration information, where the first message includes network slice configuration information of multiple first PLMNs.

Step 830, the CU determines the first PLMN list of the target PLMN and the second PLMN list of the PLMNs supporting network slicing according to the first message.

In this step, after the CU obtains the first message, the first PLMN list of the target PLMN and the second PLMN list of the PLMNs supporting network slicing can be determined from the TAI Slice Support List.

Step 840, the CU sends first connection information to the 5G core network, where the first connection information includes the second PLMN list.

In this step, the CU sends first connection information to the 5G core network, where the first connection information is used to confirm to the 5G core network the PLMNs supported by the 5G core network in the second PLMN list. The CU can independently send the first connection information to the 5G core network, and is also set in the NG setup request information NG SETUP REQUEST. Since the CU only needs to send the second PLMN list to the 5G core network for confirmation, instead of sending the list of all PLMNs to the 5G core network for confirmation, network resources can be saved.

Step 850, the CU obtains the first connection feedback information from the 5G core network, and the first connection feedback information includes the list of the first available PLMNs supported by the 5G core network in the list of the second PLMN;

In this step, the 5G core network sends first connection feedback information to the CU in response to the first connection information sent by the CU, and the one connection feedback information includes the first available connection supported by the 5G core network in the list of the second PLMN. The PLMN list is equivalent to the 5G core network filtering out the list of PLMNs it supports in the second PLMN list to form the first available PLMN list.

Step 860, the CU sends a second message to the DU, where the second message includes the first available PLMN list.

In this step, the CU sends a second message to the DU according to the first connection feedback information fed back by the 5G core network, where the second message includes the first available PLMN list. for the PLMN that activates the DU.

Step 870, the DU generates the access restriction information of the target PLMN according to the first configuration information, and the access restriction information is used to restrict the user equipment UE that supports the independent networking SA service from accessing the target PLMN;

In this step, the cell broadcast information to be broadcast to the UE includes a PLMN control list and a control identifier corresponding to each element in the PLMN control list. For example, in one embodiment, the PLMN control list is the UAC field in SIB1, and the uac-BarringperPLMN-List in the UAC field is the UACuac-BarringFactor corresponding to each item in the uac-BarringperPLMN-List in the PLMN control list as the control identifier. By writing the first PLMN list into the uac-BarringperPLMN-List, and configuring the UACuac-BarringFactor corresponding to each target PLMN to restrict access, that is, setting the UACuac-BarringFactor to P00, indicating that the probability of accessing the PLMN is 0, Since the UAC field is configured for the 5G access environment, the above configuration will not affect the NSA user's access to the target PLMN, but it can prevent the SA user from accessing the target PLMN that does not support slicing.

Step 880, the DU sends cell broadcast information to the UE, where the cell broadcast information includes access restriction information and PLMN access information used to inform the UE that the current NR cell supports PLMN, and the PLMN access information includes the first available PLMN list and the first available PLMN list. List of PLMNs.

In an information sending method provided by an embodiment of the present application, the DU obtains the first configuration information of multiple first public land mobile network PLMNs in the NR cell, thereby determining a target PLMN that does not support network slicing among the PLMNs currently sharing the NR cell. Some target PLMNs only support the NSA service in the NR cell of the NSA/SA hybrid network, but do not fully support the SA service. Generate access restriction information corresponding to the target PLMN according to the first configuration information, and broadcast the access restriction information to the UE, so that the UE selects a PLMN for accessing the NR cell according to the access restriction information. The target PLMN that fully supports the SA service, therefore, the UE that supports the SA service will not select the target PLMN for access according to the access restriction information, so it can avoid the service failure or confusion caused by the user of SA accessing the PLMN of the NSA. Improve communication quality. In addition, since the CU only needs to upload and check the PLMN that supports the SA service when establishing communication with the 5G core network, it can effectively save system resources compared to sending all PLMNs in some situations in the art.

In one embodiment, referring to FIG. 9 , after step 880, the following steps are further included:

Step 910, the DU updates the first configuration information of the first PLMN to obtain the second configuration information;

Step 920: The DU sends a third message to the CU according to the second configuration information, where the third message includes the updated network slice configuration information of the multiple first PLMNs.

In this step, the DU can send a third message to the CU through the F1 interface, and the third message can be a setup request SETUP REQUEST in the F1 interface, where the SETUP REQUEST includes the network slice configuration field TAI Slice Support List of each PLMN, and the DU Fill in the TAI Slice Support List according to the second configuration information, fill in the TAI Slice Support List for PLMNs with network slice configuration in the second configuration information, and do not fill in the TAI Slice Support List for the target PLMNs without network slice configuration in the second configuration information , leaving it blank.

Step 930, the CU determines, according to the third message, the third PLMN list of the updated target PLMN and the fourth PLMN list of the PLMNs supporting network slicing;

In this step, after the CU obtains the third message, the third PLMN list of the target PLMN and the fourth PLMN list of the PLMNs supporting network slicing can be determined from the TAI Slice Support List.

Step 940, the CU determines the second available PLMN list supported by the 5G core network in the fourth PLMN list according to the fourth PLMN list;

In this step, since the CU has learned all available PLMNs from the feedback information of the 5G core network when establishing the NG connection, the CU can filter out the second available PLMN list supported by the 5G core network in the fourth PLMN list.

Step 950, the CU sends a fourth message to the DU, where the fourth message includes the second available PLMN list.

In this step, the CU feeds back the fourth message to the DU, including the second available PLMN list and the third PLMN list supported by the 5G core network. In an embodiment, the fourth message may also be called an activation message, and is used to activate the PLMN of the DU.

Step 960, the DU generates the updated access restriction information of the target PLMN according to the second configuration information;

In this step, after the target PLMN is determined, the access restriction information needs to be updated, and the updated access restriction information is still used to restrict the user equipment UE supporting the independent networking SA service from accessing the target PLMN. According to the second configuration information, it is determined to modify the UAC field in the SIB1 message, so that the UE supporting the SA service ignores or prohibits access to the target PLMN when selecting a PLMN.

The UAC field includes the UAC public restricted PLMN list: uac-BarringperPLMN-List, the updated third PLMN list can be written into the uac-BarringperPLMN-List, and there is also a control identifier corresponding to the third PLMN list, for example In one embodiment, the UAC field also includes a UAC barring access factor corresponding to each item in the uac-BarringperPLMN-List: uac-BarringFactor, represented by PX(PX1, PX2...PXn), where X ranges from 0 to 100 , PX indicates the access probability corresponding to the target PLMN, for example, P10 indicates that the access probability is 10%, and in this embodiment, in order to prevent SA users from accessing the target PLMN, the uac-BarringperPLMN-List corresponding to the third PLMN list All BarringFactors are set to P00, indicating that the access probability is 0. Since the UAC field is configured for the 5G access environment, the above configuration will not affect the NSA user's access to the target PLMN.

Step 970, the DU sends the cell broadcast information to the UE, the cell broadcast information includes the access restriction information and the updated PLMN access information, and the PLMN access information includes the second available PLMN list and the third PLMN list.

10 , an embodiment of the present application provides an NR cell access method, which is applied to a mobile terminal, and the method includes the following steps:

Step 1010: Obtain the access restriction information sent by the DU.

In this step, the access restriction information is sent by a communication system composed of a DU or a CU and a DU according to the information sending method described in any one of the above embodiments of the present application. For example, the DU sends the access restriction information to the UE through the information sending methods described in steps 310 to 330, steps 410 to 420, steps 510 to 530, steps 610 to 640, and steps 710 to 730 in the above embodiment . For another example, in the communication system composed of the CU and the DU shown in FIG. 2 , the access restriction information is sent through steps 810 to 880 and steps 910 to 960 in the foregoing embodiment.

In an embodiment, the access barring information is carried in the SIB1 message broadcast by the DU to the UE, and the SIB1 includes the universal access control UAC field, and the UAC field includes the UAC public barring PLMN list: uac-BarringperPLMN-List and its corresponding UAC Access prohibition factor: uac-BarringFactor, the UE obtains the SIB1 message and reads the first PLMN list in uac-BarringperPLMN-Lis, the first PLMN list records the information of PLMNs that do not support network slicing (that is, the target PLMN), The uac-BarringFactor records the control identifier corresponding to the uac-BarringperPLMN-List, where the control identifier corresponding to the first PLMN list is set to restrict access. For example, the access probability of the first PLMN list is configured as 0, and the corresponding uac-BarringFactor is set The parameter is P00.

Step 1020: Select the NR cell where the PLMN accesses the DU according to the access restriction information.

After the UE obtains the uac-BarringperPLMN-List and its corresponding uac-BarringFactor from SIB1, it will not connect to the target PLMN in the first PLMN list that does not support network slicing.

2, an embodiment of the present application provides a communication system, the communication system includes a centralized unit CU and a distributed unit DU,

The DU acquires first configuration information of multiple first PLMNs sharing the NR cell, where the first configuration information is used to determine whether the first PLMN is a target PLMN that does not support network slicing;

The DU sends a first message to the CU according to the first configuration information, where the first message includes network slice configuration information of multiple first PLMNs;

The CU determines, according to the first message, the first PLMN list of the target PLMN and the second PLMN list of the PLMNs supporting network slicing;

The CU sends first connection information to the 5G core network, where the first connection information includes a second PLMN list;

The CU obtains the first connection feedback information from the 5G core network, and the first connection feedback information includes the list of the first available PLMNs supported by the 5G core network in the list of the second PLMN;

The CU sends a second message to the DU, where the second message includes the first available PLMN list;

The DU generates access restriction information of the target PLMN according to the first configuration information, and the access restriction information is used to restrict the user equipment UE that supports the independent networking SA service from accessing the target PLMN;

The DU sends cell broadcast information to the UE, where the cell broadcast information includes access restriction information and PLMN access information used to inform the UE that the current NR cell supports PLMN, and the PLMN access information includes the first available PLMN list and the first PLMN list.

In an embodiment, the DU updates the first configuration information of the first PLMN to obtain the second configuration information;

The DU sends a third message to the CU according to the second configuration information, where the third message includes the updated network slice configuration information of the multiple first PLMNs;

The CU determines, according to the third message, the third PLMN list of the updated target PLMN and the fourth PLMN list of the PLMNs supporting network slicing;

The CU determines, according to the fourth PLMN list, the second available PLMN list supported by the 5G core network in the fourth PLMN list;

The CU sends a fourth message to the DU, and the fourth message includes the second available PLMN list;

The DU generates the updated access restriction information of the target PLMN according to the second configuration information;

The DU sends cell broadcast information to the UE, where the cell broadcast information includes access restriction information and updated PLMN access information, and the PLMN access information includes a second available PLMN list and a third PLMN list.

Referring to FIG. 11 and FIG. 12 , an embodiment of the overall flow of the entire PLMN configuration, identification and information sending method is described below in conjunction with the UE, DU, CU and 5G core network.

Referring to FIG. 11 , for an embodiment of a process for initial establishment of cell activation, the preset condition is that a NR cell is configured for DU, and the NR cell is shared by PLMN_1, PLMN_2 and PLMN_3, wherein the configuration information of PLMN_1 and PLMN_2 is configured with network slicing function , PLMN_3 is not configured with network slicing function, 5G core network supports PLMN_1 and its network slicing, including the following steps:

Step 1100: The DU sends the PLMN information of the NR cell to the CU through F1 SETUP REQUEST, wherein the TAI Slice Support List (network slice support list) of PLMN_1 and PLMN_2 is filled with relevant slices, and the TAI Slice Support List of PLMN_3 is blank.

Step 1101: The CU initiates the NG establishment information SETUP REQUEST to the 5G core network, and obtains the information of the PLMN_1 supported by the 5G core network. According to the PLMN information of the NR cell sent by the DU through F1, the CU obtains that PLMN_3 is the PLMN of the NSA, and then according to the 5G core network information, obtains that PLMN_1 is the PLMN that supports the SA service, and PLMN_2 is the unavailable PLMN.

Step 1102: The CU replies to create connection feedback information SETUP RESPONSE through the F1 interface, and fills in PLMN_1 and PLMN_3 in the Available PLMN list in the cell activation information.

Step 1103: DU updates PLMN_1 and PLMN_3 to SIB1 after receiving it, and learns that PLMN_3 is not configured with slices according to the local configuration, which is the PLMN of the NSA service. The DU adds the PLMN_3 index and all service types to uac in the uac-BarringInfo of SIB1 -BarringPerPLMN-List, and set uac-BarringFactor in the corresponding UAC-BarringInfoSet to p00 at the same time, indicating that the PLMN service attempt probability of the UE is 0, and finally the DU broadcasts SIB1 to the UE.

12, in order to modify the embodiment of the PLMN configuration process, the preset condition is that after the above-mentioned embodiment of the initial establishment of the cell activation process is completed, the PLMN_2 slice information of the NR cell is deleted, and the PLMN is configured as an NSA service PLMN and then activated to take effect. .

Include the following steps:

Step 1200: The DU sends the PLMN information of the NR cell to the CU through the base station configuration update information GNB-DU CONFIGURATION UPDATE, wherein the TAI Slice Support List of PLMN_1 is filled with relevant slices, and the TAI Slice Support List of PLMN_2 and PLMN_3 is blank.

Step 1201: According to the cell information sent by the CU to the DU through the F1 interface, it is determined that PLMN_2 and PLMN_3 are PLMNs of the NSA, and then according to the 5G core network information, it is obtained that PLMN_1 is a PLMN that supports SA services. The CU replies to the base station configuration update information GNB-DU CONFIGURATION UPDATE ACK, and fills in PLMN_1, PLMN_2 and PLMN_3 in the Available PLMN list in the Cell activation information.

Step 1202: DU updates PLMN_1, PLMN_2, and PLMN_3 to SIB1 after receiving it, and learns that PLMN_2 and PLMN_3 are not configured with slices according to the local configuration, which are NSA service PLMNs, and add uac-barr function to PLMN_2 and PLMN_3, as in step 103 description, and then broadcast SIB1 to the UE.

Referring to FIG. 13 , an access network device provided by an embodiment of the application includes a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor executes the A computer program implements the information sending method described in any one of the above embodiments.

Referring to FIG. 14 , a mobile terminal provided by an embodiment of the application includes a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the The NR cell access method described in the above embodiments is applied.

A computer-readable storage medium provided by an embodiment of the present application stores computer-executable instructions, where the computer-executable instructions are used to execute the information sending method described in any of the foregoing embodiments, or to execute the information transmission method described in any of the foregoing embodiments. NR cell access method.

The technical solutions provided by the embodiments of the present application determine the current shared NR cell PLMNs that do not support network slicing by acquiring the first configuration information of multiple first public land mobile network PLMNs that share a new generation radio access technology NR cell. Target PLMNs, these target PLMNs only support the NSA service in the NR cell of the NSA/SA hybrid networking, and do not fully support the SA service. Generate access restriction information corresponding to the target PLMN according to the first configuration information, and broadcast the access restriction information to the UE, so that the UE selects a PLMN for accessing the NR cell according to the access restriction information. The target PLMN that fully supports the SA service, so the UE that supports the SA service will not select the target PLMN for access according to the access restriction information, so it can avoid the service failure or confusion caused by the SA user accessing the NSA PLMN, so it can Improve communication quality.

The apparatus embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

Those of ordinary skill in the art can understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit . Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As is known to those of ordinary skill in the art, the term computer storage media includes both volatile and nonvolatile implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data flexible, removable and non-removable media. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cartridges, magnetic tape, magnetic disk storage or other magnetic storage devices, or may Any other medium used to store desired information and which can be accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and can include any information delivery media, as is well known to those of ordinary skill in the art .

The above is a specific description of the preferred implementation of the application, but the application is not limited to the above-mentioned embodiments. Those skilled in the art can also make various equivalent deformations or replacements on the premise of not violating the spirit of the application. These Equivalent modifications or substitutions are included within the scope defined by the claims of the present application.

Claims

An information sending method, applied to a distributed unit DU, includes:

acquiring first configuration information of multiple first public land mobile network PLMNs that share a new generation radio access technology NR cell, where the first configuration information is used to determine whether the first PLMN is a target PLMN that does not support network slicing;

generating access restriction information of the target PLMN according to the first configuration information, where the access restriction information is used to restrict the user equipment UE that supports the independent networking SA service from accessing the target PLMN;

The access restriction information is broadcast to the UE.
The method of claim 1, wherein,

The broadcasting of the access restriction information to the UE includes:

Sending cell broadcast information including the access restriction information to the UE.
The method according to claim 2, wherein the cell broadcast information includes a system information block SIB1, and the SIB1 includes a PLMN control list and a corresponding control identifier for controlling the UE to access the NR cell;

The generating the access restriction information of the target PLMN according to the first configuration information includes:

Determine the first PLMN list of the target PLMN according to the first configuration information;

The first PLMN list is added to the PLMN control list, and the control identifier corresponding to the first PLMN list is configured to restrict access, so as to restrict the UE that supports the SA service from accessing the target PLMN.
The method of claim 1, further comprising:

sending a first message to the centralized unit CU, where the first message includes multiple network slice configuration information of the first PLMN;

Acquire a second message from the CU, where the second message includes a list of the first available PLMNs supported by the 5G core network among the multiple first PLMNs;

The first available PLMN list and the target PLMN list are broadcast to the UE to inform the NR cell of the PLMNs that are supported for access.
The method of claim 3, further comprising:

updating the first configuration information of the first PLMN to obtain second configuration information;

Determine the updated target PLMN according to the second configuration information;

generating the updated access restriction information of the target PLMN according to the second configuration information;

Broadcasting the updated access restriction information of the target PLMN to the UE.
The method of claim 5, further comprising:

sending a third message to the CU, where the third message includes the updated network slice configuration information of the first PLMNs;

Obtain a fourth message from the CU, where the fourth message includes a list of second available PLMNs supported by the 5G core network in the updated multiple first PLMNs;

Broadcasting the second available PLMN list and the updated target PLMN list to the UE to inform the NR cell of the PLMNs that are supported for access.
A method for sending information, applied to a communication system, the communication system comprising a centralized unit CU and a distributed unit DU, wherein the method includes:

The DU acquires first configuration information of multiple first PLMNs sharing the NR cell, where the first configuration information is used to determine whether the first PLMN is a target PLMN that does not support network slicing;

sending, by the DU, a first message to the CU according to the first configuration information, where the first message includes multiple network slice configuration information of the first PLMN;

The CU determines, according to the first message, the first PLMN list of the target PLMN and the second PLMN list of the PLMNs supporting network slicing;

The CU sends first connection information to the 5G core network, where the first connection information includes the second PLMN list;

The CU obtains first connection feedback information from the 5G core network, where the first connection feedback information includes a list of the first available PLMNs supported by the 5G core network in the list of the second PLMNs;

The CU sends a second message to the DU, where the second message includes the first available PLMN list; the DU generates access restriction information of the target PLMN according to the first configuration information, and the access The access restriction information is used to restrict the user equipment UE that supports the independent networking SA service from accessing the target PLMN;

The DU sends cell broadcast information to the UE, where the cell broadcast information includes the access restriction information and the PLMN access information used to inform the UE that the current NR cell supports the PLMN, and the PLMN access information includes the first PLMN access information. A list of available PLMNs and the first PLMN list.
The method of claim 7, further comprising:

The DU updates the first configuration information of the first PLMN to obtain second configuration information;

The DU sends a third message to the CU according to the second configuration information, where the third message includes the updated network slice configuration information of the first PLMNs;

The CU determines, according to the third message, the updated third PLMN list of the target PLMN and the fourth PLMN list of the PLMNs supporting network slicing;

The CU determines, according to the fourth PLMN list, a second available PLMN list supported by the 5G core network in the fourth PLMN list;

the CU sends a fourth message to the DU, the fourth message including the second available PLMN list;

generating, by the DU, the updated access restriction information of the target PLMN according to the second configuration information;

The DU sends cell broadcast information to the UE, the cell broadcast information includes the access restriction information and the updated PLMN access information, and the PLMN access information includes the second available PLMN list and the third List of PLMNs.
An NR cell access method, applied to a mobile terminal, wherein the method includes:

acquiring access restriction information sent by a distributed unit DU, where the access restriction information is sent by the DU according to the information sending method according to any one of claims 1 to 6;

Select the NR cell where the PLMN accesses the DU according to the access restriction information.
An access network device, comprising a memory, a processor, and a computer program stored on the memory and running on the processor, wherein, when the processor executes the computer program, any one of claims 1 to 6 is implemented The described information sending method.
A mobile terminal, comprising a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor implements the NR cell access according to claim 9 when the processor executes the computer program method.
A computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the information sending method as claimed in any one of claims 1 to 6 or execute the method as claimed in claim 9 NR cell access method.