WO2023221821A1

WO2023221821A1 - Multi-cu connection management method and apparatus, and related device

Info

Publication number: WO2023221821A1
Application number: PCT/CN2023/092998
Authority: WO
Inventors: 佟舟; 李娜; 张慧敏; 孙军帅; 刘光毅
Original assignee: 中国移动通信有限公司研究院; 中国移动通信集团有限公司
Priority date: 2022-05-16
Filing date: 2023-05-09
Publication date: 2023-11-23
Also published as: CN117119616A

Abstract

The present disclosure relates to the technical field of communications, and provided thereby are a multi-CU connection management method and apparatus, and a related device. The multi-CU connection management method comprises: receiving from a first connection a first message sent by a PDCP layer of a first CU, and after adding a first parameter in the first message, sending the first message to a MAC layer of a DU; or receiving from the first connection a second message sent by the MAC layer, and sending the second message to the PDCP layer of the first CU, the DU being connected to at least two CUs, the first CU being one of the at least two CUs, and the first connection being a connection between the first CU and the DU.

Description

Multi-CU connection management method, device and related equipment

Cross-references to related applications

This application claims priority from Chinese Patent Application No. 202210527654.4 filed in China on May 16, 2022, the entire content of which is incorporated herein by reference.

Technical field

The present disclosure relates to the field of communication technology, and in particular, to a multi-CU connection management method, device and related equipment.

Background technique

In the fifth generation ( ^5th Generation, 5G) New Radio (NR), a next generation base station (the next Generation Node B, gNB) may include a centralized unit (Centralized Unit, CU) and multiple distributed units. Unit (Distributed Unit, DU), the CU and DU are connected through the F1 interface, and the terminal and the CU are connected through the DU.

In related technologies, a DU can only be connected to one CU; in future scenarios for vertical industries, a terminal may need to connect to multiple different CUs, which are located in different geographical locations and can provide different functions. Therefore, a new connection method is needed between CU and DU.

Contents of the invention

Embodiments of the present disclosure provide a multi-CU connection method, device and related equipment to meet the terminal's need to connect multiple different CUs.

In order to solve the above problems, the present disclosure is implemented as follows:

In the first aspect, embodiments of the present disclosure provide a multi-CU connection management method, which is applied to network-side devices, including:

Receive the first message sent by the PDCP layer of the first centralized unit CU from the first connection, and after adding the first parameter to the first message, send the first message to the medium of the distribution unit DU Access control MAC layer;

or,

Receive the second message sent by the MAC layer from the first connection, and send the second message to the PDCP layer of the first CU;

Wherein, the DU is connected to at least two CUs, the first CU is one of the at least two CUs, and the first connection is a connection between the first CU and the DU.

Optionally, the first parameter includes a first identifier and/or a second identifier;

The first identifier is used to indicate the radio link control RLC channel that receives the first message, and the second identifier is used to indicate the CU corresponding to the first message.

In the second aspect, embodiments of the present disclosure provide a multi-CU connection management method, which is applied to network-side devices, including:

When the first connection has been established between the distribution unit DU and the first centralized unit CU, a second connection is established between the DU and the second CU.

Optionally, establishing a second connection between the DU and the second CU includes:

According to the terminal's business requirement information, select the second CU from the CU information associated with the DU;

Initiate a connection request to the second CU, and establish a second connection between the DU and the second CU.

Optionally, after the second connection is established between the DU and the second CU, the method further includes:

Receive a service establishment response corresponding to the second connection;

Send a radio resource control RRC reconfiguration message to the terminal, and receive a reconfiguration completion message fed back by the terminal.

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

A list of slices allowed by the terminal;

The computing capability requirements of the terminal for the CU;

The terminal has latency requirements for services provided by the corresponding network of the CU.

Optionally, the CU information associated with the DU includes at least one of the following:

Slice ID supported by the target CU;

The deployment location of the target CU;

The computing power of the target CU;

Wherein, the target CU is any CU among multiple CUs associated with the DU.

In a third aspect, embodiments of the present disclosure also provide a multi-CU connection management method, which is applied to the network side equipment, including:

When the first connection has been established between the first distribution unit DU and the first centralized unit CU, and the second connection has been established between the first DU and the second CU, establish a connection between the second DU and the second CU. third connection;

or,

When a first connection has been established between the first DU and the first CU, a second connection has been established between the first DU and the second CU, and a fourth connection has been established between the second DU and the second CU, Delete the fourth connection.

Optionally, establishing a third connection between the second DU and the second CU includes:

According to the measurement results reported by the terminal, multiple candidate DUs are obtained, wherein the reference signal received power RSRP of the cell corresponding to the candidate DU is greater than the first threshold, and the reference signal received quality RSRQ of the cell corresponding to the candidate DU is greater than the first threshold. Two thresholds;

determining a second DU among the plurality of candidate DUs;

Initiate a connection request to the second DU and establish a third connection between the second DU and the second CU.

Optionally, determining the second DU among the plurality of candidate DUs includes:

If the target DU satisfies the preset condition, determine the target DU as the second DU;

Wherein, the target DU is any DU among the plurality of candidate DUs, and the preset conditions include at least one of the following:

The slice ID supported by the target DU is the same as the slice ID supported by the first DU, and the RSRP value of the cell corresponding to the target DU is the maximum value among the multiple RSRP values of the cells respectively corresponding to the multiple candidate DUs;

The RSRQ of the cell corresponding to the target DU is greater than the RSRQ of the cell corresponding to the first DU;

The performance index of the target DU is greater than the third threshold corresponding to the performance index.

Optionally, after the third connection is established between the second DU and the second CU, the method further includes:

Receive a service establishment response corresponding to the third connection;

Optionally, deleting the fourth connection includes:

According to the measurement results reported by the terminal, the second DU is determined as the third DU, wherein the reference signal received power RSRP of the cell corresponding to the third DU is less than the first threshold, and/or the third DU corresponds to the cell The reference signal reception quality RSRQ is less than the second threshold;

Initiate a deletion request to the third DU.

Optionally, after deleting the fourth connection, the method further includes:

Receive a service deletion response corresponding to the fourth connection;

In the fourth aspect, embodiments of the present disclosure provide a multi-CU connection management method, applied to terminal devices, including:

Receive the first message from the media access control MAC layer of the terminal, and send the first message to the first Packet Data Convergence Protocol PDCP layer of the terminal;

or,

Receive a second message from the first PDCP layer of the terminal, add the second parameter to the second message, and send the second message to the MAC layer of the terminal;

Wherein, the wireless link control RLC layer of the terminal establishes a connection with at least two PDCPs of the terminal, and the first PDCP layer is one of the at least two PDCPs of the terminal; the at least two PDCPs of the terminal are connected with the network-side device. At least two CUs correspond one to one.

Optionally, the second parameter is used to indicate the RLC channel for receiving the second message.

In the fifth aspect, embodiments of the present disclosure provide a multi-CU connection management method, applied to terminal devices, including:

When the first connection has been established between the distribution unit DU and the first concentration unit CU, and the network side device adds a second connection between the DU and the second CU, receive the radio resource control RRC sent by the network side device. A reconfiguration message is sent to the network side device and a reconfiguration completion message is fed back to the network side device.

In the sixth aspect, embodiments of the present disclosure provide a multi-CU connection management method, applied to terminal devices, including:

A first connection has been established between the first distribution unit DU and the first centralized unit CU, a second connection has been established between the first DU and the second CU, and the network side device is added between the second DU and the second CU. In the case of the third connection, receive the radio resource control RRC reconfiguration sent by the network side device. reconfiguration completion message and feed back a reconfiguration completion message to the network side device;

or,

A first connection has been established between the first DU and the first CU, a second connection has been established between the first DU and the second CU, and the network side device deletes the established connection between the second DU and the second CU. In the case of the fourth connection, the radio resource control RRC reconfiguration message sent by the network side device is received, and a reconfiguration completion message is fed back to the network side device.

In a seventh aspect, embodiments of the present disclosure also provide a multi-CU connection management device, including:

First transceiver for:

or,

In an eighth aspect, embodiments of the present disclosure also provide a multi-CU connection management device, including:

First processor for:

In a ninth aspect, embodiments of the present disclosure also provide a multi-CU connection management device, including:

Second processor for:

or,

In a tenth aspect, an embodiment of the present disclosure also provides a multi-CU connection management device, including:

Fourth transceiver for:

or,

In an eleventh aspect, an embodiment of the present disclosure also provides a multi-CU connection management device, including:

Fifth transceiver for:

In a twelfth aspect, an embodiment of the present disclosure also provides a multi-CU connection management device, including:

Sixth transceiver for:

A first connection has been established between the first distribution unit DU and the first centralized unit CU, a second connection has been established between the first DU and the second CU, and the network side device is added between the second DU and the second CU. In the case of the third connection, receive the radio resource control RRC reconfiguration message sent by the network side device, and feed back the reconfiguration completion message to the network side device;

Alternatively, a first connection has been established between the first DU and the first CU, a second connection has been established between the first DU and the second CU, and the network side device is deleted between the second DU and the second CU. In the case of an established fourth connection, receive the radio resource control RRC reconfiguration message sent by the network side device, and feed back a reconfiguration completion message to the network side device.

In a thirteenth aspect, an embodiment of the present disclosure further provides a communication device, including: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor; the processor, The program in the read memory implements the steps in the method described in the first aspect; or, the steps in the method described in the second aspect; or, the steps in the method described in the third aspect; Or, the steps in the method described in the fourth aspect; or, the steps in the method described in the fifth aspect; or, the steps in the method described in the sixth aspect.

In a fourteenth aspect, embodiments of the present disclosure further provide a readable storage medium for storing a program that, when executed by a processor, implements the steps in the method described in the first aspect; or, as in the second aspect, The steps in the method described in the above aspect; or, the steps in the method described in the third aspect; or, the steps in the method described in the fourth aspect; or, the steps in the method described in the fifth aspect; Or, the steps in the method described in the sixth aspect.

In the embodiment of the present disclosure, one DU is configured to connect to multiple CUs to meet the terminal's need to connect to multiple different CUs in future scenarios for vertical industries and ensure the business continuity of the terminal.

Description of the drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments of the present disclosure will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting any creative effort.

Figure 1 is a block diagram of a wireless communication system to which embodiments of the present disclosure are applicable;

Figure 2 is one of the flow diagrams of a multi-CU connection management method applied to network-side devices provided by an embodiment of the present disclosure;

Figure 3 is a second schematic flowchart of a multi-CU connection management method applied to network-side devices provided by an embodiment of the present disclosure;

Figure 4 is a schematic structural diagram of a wireless bearer provided by an embodiment of the present disclosure;

Figure 5 is a schematic diagram of RRC message routing provided by an embodiment of the present disclosure;

Figure 6 is a schematic flowchart of another multi-CU connection management method applied to network-side devices provided by an embodiment of the present disclosure;

Figure 7 is a schematic diagram of a CU adding process provided by an embodiment of the present disclosure;

Figure 8 is a schematic diagram of another CU adding process provided by an embodiment of the present disclosure;

Figure 9 is a schematic flowchart of yet another multi-CU connection management method applied to network-side devices provided by an embodiment of the present disclosure;

Figure 10 is a schematic diagram of a DU addition and deletion process provided by an embodiment of the present disclosure;

Figure 11 is a schematic diagram of another DU addition and deletion process provided by an embodiment of the present disclosure;

Figure 12 is one of the flow diagrams of a multi-CU connection management method applied to a terminal device provided by an embodiment of the present disclosure;

Figure 13 is a second schematic flowchart of a multi-CU connection management method applied to a terminal device provided by an embodiment of the present disclosure;

Figure 14 is a schematic flowchart of another multi-CU connection management method applied to terminal devices provided by an embodiment of the present disclosure;

Figure 15 is a schematic flowchart of yet another multi-CU connection management method applied to a terminal device provided by an embodiment of the present disclosure;

Figure 16 is a schematic structural diagram of a multi-CU connection management device provided by an embodiment of the present disclosure;

Figure 17 is a schematic structural diagram of another multi-CU connection management device provided by an embodiment of the present disclosure;

Figure 18 is a schematic structural diagram of another multi-CU connection management device provided by an embodiment of the present disclosure;

Figure 19 is a schematic structural diagram of yet another multi-CU connection management device provided by an embodiment of the present disclosure;

Figure 20 is a schematic structural diagram of yet another multi-CU connection management device provided by an embodiment of the present disclosure;

Figure 21 is a schematic structural diagram of another multi-CU connection management device provided by an embodiment of the present disclosure;

Figure 22 is a schematic structural diagram of a communication device provided by an embodiment of the present disclosure.

Detailed ways

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of this disclosure.

The terms "first", "second", etc. in the description and claims of the present disclosure are used to distinguish similar objects and are not used to describe a specific order or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances so that embodiments of the present disclosure can be practiced in sequences other than those illustrated or described herein, and that "first" and "second" are distinguished objects It is usually one type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, in the description and claims, "and/or" represents at least one of the connected objects, and the character "/" generally represents the preceding The post-association object is an "OR" relationship.

It is worth pointing out that the technology described in the embodiments of the present disclosure is not limited to Long Term Evolution (LTE)/LTE Evolution (LTE-Advanced, LTE-A) systems, and can also be used in other wireless communication systems, such as code Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access, OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) and other systems. The terms "system" and "network" are often used interchangeably in embodiments of the present disclosure, and the described technology may be used for both the systems and radio technologies mentioned above, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in much of the following description, but these techniques can also be applied to applications other than NR system applications, such as 6th ^generation Generation, 6G) communication system.

FIG. 1 shows a block diagram of a wireless communication system to which embodiments of the present disclosure are applicable. The wireless communication system includes a terminal 11 and a network side device 12. Among them, the terminal 11 can also be called a terminal device or a user terminal (User Equipment, UE). The terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), or a notebook computer or a personal digital computer. Assistant (Personal Digital Assistant, PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile Internet device (Mobile Internet Device, MID), wearable device (Wearable Device) or vehicle-mounted device (Vehicle User Equipment, VUE), Pedestrian User Equipment (PUE) and other terminal-side devices, wearable devices include: smart watches, bracelets, headphones, glasses, etc. It should be noted that the embodiment of the present disclosure does not limit the specific type of terminal 11. The network side device 12 may be a base station or a core network, where the base station may be called a Node B, an evolved Node B, an access point, a Base Transceiver Station (BTS), a radio base station, a radio transceiver, or a basic service Basic Service Set (BSS), Extended Service Set (ESS), B node, evolved B node (eNB), home B node, home evolved B node, Wireless Local Area Network (WLAN) ) access point, wireless network communication technology (Wireless Fidelity, WiFi) node, transmitting receiving point (Transmitting Receiving Point, TRP) or in the field Some other suitable terminology, as long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiment of the present disclosure, only the base station in the NR system is taken as an example, but the base station is not limited. Concrete type.

The following describes the multi-CU connection management method provided by embodiments of the present disclosure.

Referring to FIG. 2 and FIG. 3 , FIG. 2 is the first schematic flowchart of the multi-CU connection management method provided by the embodiment of the present disclosure. FIG. 3 is the second schematic flowchart of the multi-CU connection management method provided by the embodiment of the present disclosure. The multi-CU connection management methods shown in Figures 2 and 3 are applied to network-side devices.

As shown in Figure 2, the multi-CU connection management method may include the following steps:

Step 201: Receive the first message sent by the PDCP layer of the first centralized unit CU from the first connection.

Step 202: After adding the first parameter to the first message, send the first message to the medium access control MAC layer of the distribution unit DU.

Alternatively, as shown in Figure 3, the multi-CU connection management method may also include the following steps:

Step 301: Receive the second message sent by the MAC layer from the first connection.

Step 302: Send the second message to the PDCP layer of the first CU.

It should be noted that the connection between DU and at least two CUs can be understood as that at least two CUs establish connections with the terminal through DU. Similarly, the connection between the first CU and DU can be understood as that the first CU establishes connections with the terminal through DU. DU establishes a connection with the terminal.

At least any two of the two CUs are different (such as different functions, different processing capabilities, or different geographical locations, etc.). For example, at least one of the two CUs can be deployed at the edge to reduce terminal For CUs with access latency, at least the other of the two CUs can be a CU deployed in the cloud to reduce deployment costs.

Preferably, at least two Packet Data Convergence Protocol (PDCP) entities are associated with one Radio Link Control (RLC) bearer to realize the connection between one DU and at least two CUs. Among them, at least two PDCP entities correspond to at least two CUs one-to-one, and the RLC bearer should be understood as the RLC and Medium Access Control (Medium Access Control, MAC) logical channel configuration on a radio bearer in a cell group. Set.

Wherein, the first identifier is used to indicate the radio link control RLC channel to receive the first message, and the second identifier is used to indicate the CU corresponding to the first message.

As mentioned above, for the network side device, when performing downlink transmission (corresponding to the first message), at least two PDCP entities can be distinguished by marking the RLC channel used to transmit the first message, so as to indirectly complete the Distinguish between at least two CUs that establish a connection with the DU at the terminal; when performing uplink transmission (corresponding to the second message), the second message can be directly transmitted to the corresponding PDCP entity according to the message routing related to the second message.

In addition, during the downlink transmission process, the network side device can also directly distinguish at least two CUs that establish connections with the DU at the terminal by marking the CU corresponding to the first message, where it is understandable that the first message corresponds to the CU Therefore, the CU is the message sending source of the first message.

To facilitate understanding, take the following downstream transmission process as an example. The example description is as follows:

Referring to Figure 4, the PDCP entity corresponding to the first CU and the PDCP entity corresponding to the second CU are associated with the RLC bearer corresponding to the DU. The RLC bearer includes two parts: the RLC layer and the MAC layer. The RLC layer communicates with the PDCP through the RLC channel (Channel). layer communicates. Different PDCP entities transmit RLC Service Data Unit (SDU) to the RLC layer through different RLC channels. By setting different channel identifiers (Identity, ID) for different RLC channels, the RLC layer can Identify upper layer (can be understood as PDCP layer) information from different RLC channels.

The message transmitted by the RLC layer to the lower layer (can be understood as the MAC layer in Figure 4) is the RLC Protocol Data Unit (PDU). The RLC PDU includes the RLC header (header) and the RLC SDU. The RLC header can include the aforementioned first parameter. .

It should be noted that the above-mentioned RLC header remains unchanged during the message transmission process. Therefore, when the RLC layer receives the second message sent by the MAC layer, the RLC layer can determine the RLC channel according to the first parameter in the RLC header corresponding to the second message. , and directly transmit the second message to the corresponding PDCP layer through the RLC channel.

In this example, as shown in Figure 5, the first identifier included in the set first parameter is represented by a reserved field "R" (Reserved (R) field) in the RLC header. The value of the "R" field can be set to 0 or 1 to correspond to the channel IDs of different RLC channels respectively. For example, as shown in Table 1, when channel ID = 0, set the value of the "R" field to 0; when channel ID = 1, set the value of the "R" field to 1 (it can also be used in the channel When ID=0, set the value of the "R" field to 1; when channel ID=1, set the value of the "R" field to 0).

Table 1

In this example, the first identifier included in the first parameter can also be set through the reserved field "R" (Reserved (R) field) in the RLC header and the used field in the RLC header (the used field can be one, or Comprehensive representation of two or more), set the value of the "R" field to 0 or 1, and the value of the used field to 0 or 1 to respectively correspond to the channel IDs of different RLC channels. For example, as shown in Table 2, when channel ID=0, set the value of the first parameter to 00 (that is, set the value of the "R" field to 0 and the value of the used field to 0); When channel ID=1, set the value of the first parameter to 01 (that is, set the value of the "R" field to 0 and the value of the used field to 1); when channel ID=2, set the value of the first parameter to 01. The value is 10 (that is, set the "R" field value to 1 and the used field value to 0); when channel ID = 3, set the first parameter value to 11 (that is, set the "R" field value to 1, the value of the used field is also 1).

Table 2

In this example, it is also possible to set the first identifier included in the first parameter to be represented by at least one field that has been used in the RLC header.

The setting method of the second identifier can be referred to the setting method of the first identifier in the above example. To avoid repetition, the details will not be described again.

Referring to Figure 6, Figure 6 is a schematic flowchart of a multi-CU connection management method provided by an embodiment of the present disclosure. The multi-CU connection management method shown in Figure 6 is applied to network-side devices.

As shown in Figure 6, the multi-CU connection management method may include the following steps:

Step 601: When the first connection has been established between the distribution unit DU and the first centralized unit CU, establish a second connection between the DU and the second CU.

By adding a second connection between a DU and a second CU, the connection between one DU and multiple CUs is realized to meet the needs of terminals to connect to multiple different CUs in future scenarios for vertical industries. Ensure terminal business continuity.

It should be noted that the second CU should be understood as a CU that is different from the first CU (such as different functions, different processing capabilities, or different geographical locations, etc.). For example, the first CU may be deployed at the edge to reduce terminal access. The second CU can be deployed in the cloud to reduce deployment costs.

The number of the second CU may be one, or two or more. In the case where the number of second CUs is two or more, the two or more second CUs are different (for example, at least one of the information such as function, processing capability, or geographical location exists) different).

In some embodiments, the selection operation of the second CU may be performed by the DU, that is, the DU receives the service requirement information of the terminal sent by the first CU, and selects the second CU information from the CU information associated with the DU according to the service requirement information of the terminal. 2CU.

When the DU selects the second CU, the DU can trigger the addition operation of the second connection (that is, the DU initiates a service establishment request to the second CU so that the second CU reserves relevant service resources for the terminal), and will add the situation and The relevant information of the second CU is also fed back to the first CU.

When the DU selects the second CU, the DU may send relevant information about the selected second CU. Send it to the first CU, so that the adding operation of the second connection is triggered according to the first CU (that is, the first CU initiates a service establishment request to the second CU, so that the second CU reserves relevant service resources for the terminal).

In some embodiments, the selection operation of the second CU can also be performed by the first CU, that is, the first CU sends a CU information request message to the DU (used to request the CU list associated with the DU and the support of each CU in the CU list. service information), after the DU responds to the CU information request message, the first CU receives the CU information fed back by the DU, and selects the second CU from the received CU information according to the terminal's business requirement information.

In the case where the first CU selects the second CU, the first CU may feed back the selected second CU to the DU, so that the DU triggers the adding operation of the second connection.

When the first CU selects the second CU, the first CU can also directly trigger the adding operation of the second connection.

Specifically, the service requirement information of the terminal includes at least one of the following:

Slice Support List allowed by the terminal;

The terminal’s computing capability requirements for the CU (CU Capability Request), such as the terminal’s requirements for the data processing rate of the CU, etc.;

The terminal has a latency requirement (Maximum Latency) for the services provided by the corresponding network of the CU.

It should be noted that the business requirement information of the terminal may be obtained by the first CU from the terminal, or may be obtained by the first CU from other network nodes. For example, the other network nodes may be application functions (Application Function, AF), Application Server (Application Server, AF), or Policy Control Function (PCF), etc.

Specifically, the CU information associated with the DU includes at least one of the following:

Slice IDs supported by the target CU (CU support S-NSSAIs);

The deployment location (CU Location) of the target CU, such as the location of the computer room of the target CU and/or the distance between the target CU and the DU, etc.;

The computing capability of the target CU (CU capability);

Wherein, the target CU is any CU among multiple CUs associated with the DU.

Send a Radio Resource Control (RRC) reconfiguration message to the terminal, and receive a reconfiguration completion message fed back by the terminal.

As mentioned above, after the second connection is established, the first CU receives the service establishment response of the second CU corresponding to the second connection, and sends the updated configuration information to the terminal through the RRC reconfiguration message, and the terminal receives the RRC reconfiguration. After the message is sent, a reconfiguration completion message is fed back to the first CU.

To facilitate understanding, the examples are as follows:

As shown in Figure 7, DU receives the CU selection configuration (i.e., the terminal's business requirement information) sent by the first CU, and completes the CU selection response (i.e., selects the second CU in the CU information associated with the DU) based on the CU selection configuration. Subsequently, the CU adding request and response are completed through DU or the first CU (that is, the adding operation of the second connection is triggered); after the second connection is added, the first CU receives the second CU (that is, other CUs in Figure 7) corresponding to the above The second connection responds to the service establishment and sends the updated configuration information to the terminal through an RRC reconfiguration message. After receiving the RRC reconfiguration message, the terminal feeds back a reconfiguration completion message to the first CU.

As shown in Figure 8, the first CU sends a CU information request message to the DU (used to request the CU list associated with the DU and the service information supported by each CU in the CU list). After the DU responds to the CU information request message, The first CU receives the CU information fed back by the DU, and selects the second CU from the received CU information based on the terminal's business requirement information, and subsequently completes the CU addition request through the DU or the first CU; after the second connection is added, the first CU The CU receives the service establishment response of the second CU (that is, other CUs in Figure 8) corresponding to the second connection, and sends the updated configuration information to the terminal through an RRC reconfiguration message. After receiving the RRC reconfiguration message, the terminal sends The first CU feeds back a reconfiguration completion message.

Referring to Figure 9, Figure 9 is a schematic flowchart of a multi-CU connection management method provided by an embodiment of the present disclosure. The multi-CU connection management method shown in Figure 9 is applied to network-side devices.

As shown in Figure 9, the multi-CU connection management method may include the following steps:

Step 901: When the first connection has been established between the first distribution unit DU and the first centralized unit CU, and the second connection has been established between the first DU and the second CU, when the second DU and the second CU Establish a third connection between them;

or,

The first connection has been established between the first DU and the first CU, and the first connection has been established between the first DU and the second CU. When the second connection is established and a fourth connection has been established between the second DU and the second CU, the fourth connection is deleted.

By establishing a third connection between the second DU and the second CU, or by deleting the fourth connection established by the terminal between the third DU and the second CU, in the case where one DU is connected to multiple CUs Next, changes to DU are implemented to meet the needs of terminals to connect to multiple different CUs in future scenarios for vertical industries and ensure the business continuity of terminals.

The second DU should be understood as a DU that is different from the first DU. In this embodiment of the present disclosure, the number of the second DU may be one, or two or more, and this is not limited in this embodiment of the present disclosure.

According to the measurement results reported by the terminal, multiple candidate DUs are obtained, wherein the reference signal received power (RSRP) of the cell corresponding to the candidate DU is greater than the first threshold, and the reference signal received power (RSRP) of the cell corresponding to the candidate DU is Reference Signal Received Quality (RSRQ) is greater than the second threshold;

determining a second DU among the plurality of candidate DUs;

In some embodiments, the determination of the second DU may be performed by the first CU, that is, the first CU obtains multiple candidate DUs based on the measurement results reported by the terminal; the first CU determines the second DU among the multiple candidate CUs. , and sends the relevant information of the second DU to the second CU, so that the second CU initiates a connection request to the second DU.

In some implementations, the determination of the second DU can also be performed by the second CU, that is, the second CU obtains multiple candidate DUs based on the measurement results reported by the terminal; the second CU determines the second DU among the multiple candidate CUs. DU and initiates a connection request to the second DU.

Among them, the measurement results reported by the terminal include:

The physical cell identifier (PCI) of this cell and the PCI of neighboring cells;

RSRP and RSRQ of the cell related to the first DU;

RSRP and RSRQ of the cell related to other DUs associated with the terminal.

When determining the second DU among multiple candidate DUs, the first CU or the second CU will exchange information with the multiple candidate DUs respectively, and determine the second DU based on the exchanged information and the service requirements of the terminal; wherein , the interaction information between the first CU or the second CU and multiple candidate DUs includes: the slice list supported by the candidate DU (DU support S-NSSAIs), the channel quality of the cell where the candidate DU is located, and the calculation of the candidate DU capabilities, location information of candidate DU, etc.

Further, determining the second DU among the plurality of candidate DUs includes:

For example, when the load of the slice accessed by the terminal through the first DU is higher than the load threshold, the alternative DU supporting the same slice ID (referring to the slice ID supported by the alternative DU and the slice ID supported by the first DU (the same), determine the candidate DU with the largest RSRP value of the relevant cell as the second DU;

or,

In the case where the signal quality of the first DU-related cell is lower than the quality threshold, a candidate DU with a channel quality better than that of the first DU-related cell among the plurality of candidate DUs is determined as the second DU (the determined The number of second DU is at least one);

or,

When the terminal has specific requirements for performance indicators such as delay and throughput (such as requiring delay to be less than a time threshold, or throughput to be greater than a throughput threshold, etc.), and the service provided by the first DU cannot meet the specific requirements, Among multiple candidate DUs, determine the candidate DU that meets the specific requirements. is determined as the second DU (the number of determined second DUs is at least one).

Receive a service establishment response corresponding to the third connection;

In some embodiments, when the determination of the second DU is performed by the first CU, after the third connection is established, the first CU will receive the service establishment response of the second CU corresponding to the third connection, and will update the The configuration information is sent to the terminal through an RRC reconfiguration message. After receiving the RRC reconfiguration message, the terminal feeds back a reconfiguration completion message to the first CU.

In some embodiments, when the determination of the second DU is performed by the second CU, after the third connection is established, the second CU sends the updated configuration information to the terminal through an RRC reconfiguration message, and the terminal receives the RRC reconfiguration. After receiving the message, the second CU feeds back the reconfiguration completion message to the second CU, and the second CU feeds back the reconfiguration completion message to the first CU.

Optionally, deleting the fourth connection includes:

According to the measurement results reported by the terminal, the second DU is determined as the third DU, wherein the reference signal received power RSRP of the cell corresponding to the third DU is less than the first threshold, and/or the reference signal received power RSRP of the cell corresponding to the third DU The signal reception quality RSRQ is less than the second threshold;

Initiate a deletion request to the third DU.

The determination of the third DU may be performed by the first CU or the second CU, that is, the first CU receives the measurement results reported by the terminal, and determines the second DU as the third DU based on the measurement results; or, the second CU receives The measurement result reported by the terminal is determined as the third DU based on the measurement result.

If the third DU is determined by the first CU, the first CU sends the relevant information of the third DU to the second CU, so that the second CU initiates a deletion request to the third DU; if the third DU is determined by the second CU, then The second CU directly initiates a deletion request to the third DU.

For the measurement results reported by the terminal, please refer to the previous description. To avoid repetition, they will not be described again.

Optionally, after deleting the fourth connection, the method further includes:

Receive a service deletion response corresponding to the fourth connection;

In some embodiments, if the third DU is determined by the first CU, after the third connection is established, the first CU will receive the service deletion response corresponding to the third connection from the second CU, and pass the updated configuration information through The RRC reconfiguration message is sent to the terminal. After receiving the RRC reconfiguration message, the terminal feeds back a reconfiguration completion message to the first CU.

In some embodiments, if the third DU is determined by the second CU, after the third connection is established, the second CU sends the updated configuration information to the terminal through an RRC reconfiguration message (corresponding to the deletion of the third connection), and the terminal After receiving the RRC reconfiguration message, the second CU feeds back the reconfiguration complete message to the second CU, and the second CU feeds back the reconfiguration complete message to the first CU.

To facilitate understanding, the examples are as follows:

Referring to Figure 10, when the first connection has been established between the first DU and the first CU, and the second connection has been established between the first DU and the second CU, the adding process of the second DU may be:

The terminal reports the measurement results to the first CU. After the first CU determines the second DU based on the service requirements of the terminal, it sends the relevant information of the second DU to the second CU, so that the second CU initiates an addition request to the second DU; in the After the establishment of the three connections is completed, the second CU sends a service establishment response corresponding to the third connection (i.e., the second DU addition response in Figure 10) to the first CU, and the first CU generates an RRC reconfiguration based on the service establishment response. information, and sends the RRC reconfiguration information to the terminal (after the reconfiguration is completed, the terminal will feed back the reconfiguration completion message to the first CU).

Referring to Figure 10 (the second DU deletion stage in Figure 10 can be understood as the fourth connection deletion stage), the first connection has been established between the first DU and the first CU, and the first connection has been established between the first DU and the second CU. When there are two connections, and a fourth connection has been established between the second DU and the second CU, the deletion process of the fourth connection can be:

The terminal reports the measurement results to the first CU. After the first CU determines the second DU as the third DU based on the preset conditions, it sends relevant information of the second DU (that is, the determined third DU) to the second CU. So that the second CU initiates a deletion request to the second DU; after the fourth connection is deleted, the second CU sends a service deletion response corresponding to the fourth connection (i.e., the second DU deletion response in Figure 10) to the third DU. One CU, the first CU generates RRC reconfiguration information based on the service deletion response, and sends the RRC reconfiguration information to the terminal (after the reconfiguration is completed, the terminal will feedback the reconfiguration to the first CU completion message).

Referring to Figure 11, when the first connection has been established between the first DU and the first CU, and the second connection has been established between the first DU and the second CU, the adding process of the second DU may be:

The terminal reports the measurement results to the second CU. After the second CU determines the second DU based on the terminal's service requirements, it initiates an add request to the second DU; after the third connection is established, based on the newly established third connection, the second CU Send RRC reconfiguration information to the terminal, and receive a reconfiguration completion message fed back by the terminal, and then the second CU forwards the reconfiguration completion message to the first CU.

Referring to Figure 11 (the second DU deletion stage in Figure 11 can be understood as the fourth connection deletion stage), the first connection has been established between the first DU and the first CU, and the first connection has been established between the first DU and the second CU. When there are two connections, and a fourth connection has been established between the second DU and the second CU, the deletion process of the fourth connection can be:

The terminal reports the measurement results to the second CU. After the second CU determines the second DU as the third DU based on the preset conditions, it initiates a deletion request to the second DU (that is, the determined third DU); in the fourth connection After deletion, based on the deleted fourth connection, the second CU sends RRC reconfiguration information to the terminal and receives a reconfiguration complete message fed back by the terminal. Then the second CU forwards the reconfiguration complete message to the first CU.

Referring to FIG. 12 and FIG. 13 , FIG. 12 is the first schematic flowchart of the multi-CU connection management method provided by the embodiment of the present disclosure, and FIG. 13 is the second schematic flowchart of the multi-CU connection management method provided by the embodiment of the present disclosure. The multi-CU connection management method shown in Figures 12 and 13 is applied to terminal equipment.

As shown in Figure 12, the multi-CU connection management method may include the following steps:

Step 1201: Receive the first message from the media access control MAC layer of the terminal.

Step 1202: Send the first message to the first Packet Data Convergence Protocol PDCP layer of the terminal.

Alternatively, as shown in Figure 13, the multi-CU connection management method may also include the following steps:

Step 1301: Receive the second message from the first PDCP layer of the terminal.

Step 1302: After adding a second parameter to the second message, send the second message to the MAC layer of the terminal.

Wherein, the wireless link control RLC layer of the terminal establishes a connection with at least two PDCPs of the terminal, and the first PDCP layer is one PDCP of the at least two PDCPs of the terminal; at least two PDCPs of the terminal Each PDCP has a one-to-one correspondence with at least two CUs of the network side device.

It should be noted that this embodiment is an implementation of a terminal device corresponding to the method embodiments described in Figures 2 and 3. Therefore, the relevant descriptions in the above method embodiments can be referred to, and the same beneficial effects can be achieved. In order to avoid repeated explanation, they will not be described again here.

Referring to Figure 14, Figure 14 is a schematic flowchart of a multi-CU connection management method provided by an embodiment of the present disclosure. The multi-CU connection management method shown in Figure 14 is applied to terminal equipment.

As shown in Figure 14, the multi-CU connection management method may include the following steps:

Step 1401: When the first connection has been established between the distribution unit DU and the first centralized unit CU, and the network side device adds a second connection between the DU and the second CU, receive the wireless link sent by the network side device. Resource control RRC reconfiguration message, and feed back a reconfiguration completion message to the network side device.

For the process of the network side device adding a second connection between the DU and the second CU, please refer to the relevant description in the method embodiment described in Figure 6. In order to avoid repeated description, it will not be described again here.

Referring to Figure 15, Figure 15 is a schematic flowchart of a multi-CU connection management method provided by an embodiment of the present disclosure. The multi-CU connection management method shown in Figure 15 is applied to terminal equipment.

As shown in Figure 15, the multi-CU connection management method may include the following steps:

Step 1501: The first connection has been established between the first distribution unit DU and the first centralized unit CU, the second connection has been established between the first DU and the second CU, and the network side device is connected between the second DU and the second CU. When a third connection is added, receive the radio resource control RRC reconfiguration message sent by the network side device, and feed back the reconfiguration completion message to the network side device;

or,

In the embodiment of the present disclosure, the connection between one DU and multiple CUs is configured to meet the terminal's need to connect to multiple different CUs in future scenarios for vertical industries and ensure the business continuity of the terminal.

The process of the network side device adding a third connection between the second DU and the second CU, or the process of deleting the established fourth connection between the second DU and the second CU can be seen in the method embodiment described in Figure 9 The relevant instructions will not be repeated here in order to avoid repeated instructions.

Referring to Figure 16, Figure 16 is a schematic structural diagram of a multi-CU connection management device 1600 provided by an embodiment of the present disclosure. As shown in Figure 16, the multi-CU connection management device 1600 includes:

First transceiver 1601 for:

or,

The multi-CU connection management device 1600 can implement each process of the method embodiments in FIG. 2 and FIG. 3 in the embodiment of the present disclosure, and achieve the same beneficial effects. To avoid duplication, details will not be described here.

Referring to Figure 17, Figure 17 is a schematic structural diagram of a multi-CU connection management device 1700 provided by an embodiment of the present disclosure. As shown in Figure 17, the multi-CU connection management device 1700 includes:

The first processor 1701 is used for:

Optionally, the first processor 1701 is specifically used to:

Select the second CU from the CU information associated with the DU according to the service requirement information of the terminal;

The multi-CU connection management device also includes:

Second transceiver for:

Further, the service requirement information of the terminal includes at least one of the following:

A list of slices allowed by the terminal;

The computing capability requirements of the terminal for the CU;

Further, the CU information associated with the DU includes at least one of the following:

Slice ID supported by the target CU;

The deployment location of the target CU;

The computing power of the target CU;

Wherein, the target CU is any CU among multiple CUs associated with the DU.

Optionally, the second transceiver is also used for:

After a connection is established between the DU and the second CU, receive a service establishment response corresponding to the second connection;

The multi-CU connection management device 1700 can implement each process of the method embodiment in Figure 6 in the embodiment of the present disclosure, and achieve the same beneficial effects. To avoid duplication, details will not be described here.

Referring to Figure 18, Figure 18 is a schematic structural diagram of a multi-CU connection management device 1800 provided by an embodiment of the present disclosure. As shown in Figure 18, the multi-CU connection management device 1800 includes:

The second processor 1801 is used for:

or,

Optionally, the multi-CU connection management device 1800 also includes:

Third transceiver for:

Receive measurement results reported by the terminal;

The second processor 1801 is specifically used to:

According to the measurement results reported by the terminal, multiple candidate DUs are obtained, wherein the reference signal received power RSRP of the cell corresponding to the candidate DU is greater than the first threshold, and the reference signal received quality RSRQ of the cell corresponding to the candidate DU is greater than the second threshold;

determining a second DU among the plurality of candidate DUs;

The third transceiver is also used for:

Optionally, the second processor 1801 is specifically used to:

Optionally, the third transceiver is also used for:

After the third connection is established between the second DU and the second CU, receive a service establishment response corresponding to the third connection;

Optionally, the third transceiver is also used for:

Receive the measurement results of the terminal at work;

The second processor 1801 is specifically used to:

According to the measurement results reported by the terminal, the second DU is determined as the third DU, wherein the reference signal received power RSRP of the cell corresponding to the third DU is less than the first threshold, and/or the third DU is The reference signal reception quality RSRQ of the cell corresponding to the three DUs is less than the second threshold;

The third transceiver is also used for:

Initiate a deletion request to the third DU.

Further, the third transceiver is also used for:

After deleting the fourth connection, receive a service deletion response corresponding to the fourth connection;

The multi-CU connection management device 1800 can implement each process of the method embodiment in Figure 9 in the embodiment of the present disclosure, and achieve the same beneficial effects. To avoid duplication, details will not be described here.

Referring to Figure 19, Figure 19 is a schematic structural diagram of a multi-CU connection management device 1900 provided by an embodiment of the present disclosure. As shown in Figure 19, the multi-CU connection management device 1900 includes:

The fourth transceiver 1901 is used for:

or,

Optionally, the first parameter is used to indicate the RLC channel for receiving the second message. The multi-CU connection management device 1900 can implement each process of the method embodiments in FIG. 12 and FIG. 13 in the embodiment of the present disclosure, and achieve the same beneficial effects. To avoid duplication, they will not be described again here.

Referring to Figure 20, Figure 20 is a schematic structural diagram of a multi-CU connection management device 2000 provided by an embodiment of the present disclosure. As shown in Figure 20, the multi-CU connection management device 2000 includes:

Fifth transceiver 2001 for:

The multi-CU connection management device 2000 can implement each process of the method embodiment in Figure 14 in the embodiment of the present disclosure, and achieve the same beneficial effects. To avoid duplication, details will not be described here.

Referring to Figure 21, Figure 21 is a schematic structural diagram of a multi-CU connection management device 2100 provided by an embodiment of the present disclosure. As shown in Figure 21, the multi-CU connection management device 2100 includes:

The sixth transceiver 2101 is used for:

or,

The multi-CU connection management device 2100 can implement each process of the method embodiment in Figure 15 in the embodiment of the present disclosure, and achieve the same beneficial effects. To avoid duplication, details will not be described here.

An embodiment of the present disclosure also provides a communication device. Referring to Figure 22, the communication device may include a processor 2201, a memory 2202, and a program 22021 stored on the memory 2202 and executable on the processor 2201.

When the communication device is a terminal, when the program 22021 is executed by the processor 2201, any steps in the method embodiment corresponding to Figure 12, Figure 13, Figure 14 or Figure 15 can be implemented and the same beneficial effects can be achieved, which will not be repeated here. Repeat.

In the case where the communication device is a network-side device, when the program 22021 is executed by the processor 2201, any steps in the method embodiments corresponding to Figure 2, Figure 3, Figure 6 or Figure 9 can be implemented and the same beneficial effects can be achieved, here No longer.

Those of ordinary skill in the art can understand that all or part of the steps to implement the methods of the above embodiments can be completed by hardware related to program instructions, and the program can be stored in a readable medium. Embodiments of the present disclosure also provide a readable storage medium. A computer program is stored on the readable storage medium. When the computer program is executed by a processor, the above-mentioned FIG. 2, FIG. 3, FIG. 6, and FIG. 9. Any steps in the method embodiments corresponding to Fig. 12, Fig. 13, Fig. 14 or Fig. 15 can achieve the same technical effect. To avoid repetition, they will not be described again here.

The storage medium, such as read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.

It should be noted that, in this document, the terms "comprising", "comprises" or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or device that includes a series of elements not only includes those elements, It also includes other elements not expressly listed or inherent in the process, method, article or apparatus. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article or apparatus that includes that element. In addition, it should be pointed out that the scope of the methods and apparatuses in the embodiments of the present disclosure is not limited to performing functions in the order shown or discussed, but may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. Functions may be performed, for example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

The above is the preferred implementation mode of the embodiment of the present disclosure. It should be pointed out that for those of ordinary skill in the art, several improvements and modifications can be made without departing from the principles described in the present disclosure. These improvements and Retouching should also be considered within the scope of this disclosure.

Claims

A multi-CU connection management method, including:

Receive the first message sent by the PDCP layer of the first centralized unit CU from the first connection, and after adding the first parameter to the first message, send the first message to the medium of the distribution unit DU Access control MAC layer;

or,

Receive the second message sent by the MAC layer from the first connection, and send the second message to the PDCP layer of the first CU;

Wherein, the DU is connected to at least two CUs, the first CU is one of the at least two CUs, and the first connection is a connection between the first CU and the DU.
The method according to claim 1, wherein the first parameter includes a first identification and/or a second identification;

The first identifier is used to indicate the radio link control RLC channel that receives the first message, and the second identifier is used to indicate the CU corresponding to the first message.
A multi-CU connection management method, including:

When the first connection has been established between the distribution unit DU and the first centralized unit CU, a second connection is established between the DU and the second CU.
The method according to claim 3, wherein establishing the second connection between the DU and the second CU includes:

According to the terminal's business requirement information, select the second CU from the CU information associated with the DU;

Initiate a connection request to the second CU, and establish a second connection between the DU and the second CU.
The method according to claim 4, wherein after the second connection is established between the DU and the second CU, the method further includes:

Receive a service establishment response corresponding to the second connection;

Send a radio resource control RRC reconfiguration message to the terminal, and receive a reconfiguration completion message fed back by the terminal.
The method according to claim 4, wherein the business requirement information of the terminal includes at least one of the following:

A list of slices allowed by the terminal;

The computing capability requirements of the terminal for the CU;

The terminal has latency requirements for services provided by the corresponding network of the CU.
The method according to claim 4, wherein the CU information associated with the DU includes at least one of the following:

Slice ID supported by the target CU;

The deployment location of the target CU;

The computing power of the target CU;

Wherein, the target CU is any CU among multiple CUs associated with the DU.
A multi-CU connection management method, including:

When the first connection has been established between the first distribution unit DU and the first centralized unit CU, and the second connection has been established between the first DU and the second CU, establish a connection between the second DU and the second CU. third connection;

or,

When a first connection has been established between the first DU and the first CU, a second connection has been established between the first DU and the second CU, and a fourth connection has been established between the second DU and the second CU, Delete the fourth connection.
The method according to claim 8, wherein establishing the third connection between the second DU and the second CU includes:

According to the measurement results reported by the terminal, multiple candidate DUs are obtained, wherein the reference signal received power RSRP of the cell corresponding to the candidate DU is greater than the first threshold, and the reference signal received quality RSRQ of the cell corresponding to the candidate DU is greater than the first threshold. Two thresholds;

determining a second DU among the plurality of candidate DUs;

Initiate a connection request to the second DU and establish a third connection between the second DU and the second CU.
The method of claim 9, wherein determining the second DU among the plurality of candidate DUs includes:

If the target DU satisfies the preset condition, determine the target DU as the second DU;

Wherein, the target DU is any DU among the plurality of candidate DUs, and the preset conditions include at least one of the following:

The slice ID supported by the target DU is the same as the slice ID supported by the first DU, and the RSRP value of the cell corresponding to the target DU is the maximum value among the multiple RSRP values of the cells respectively corresponding to the multiple candidate DUs;

The RSRQ of the cell corresponding to the target DU is greater than the RSRQ of the cell corresponding to the first DU;

The performance index of the target DU is greater than the third threshold corresponding to the performance index.
The method according to claim 9, wherein after the third connection is established between the second DU and the second CU, the method further includes:

Receive a service establishment response corresponding to the third connection;

Send a radio resource control RRC reconfiguration message to the terminal, and receive a reconfiguration completion message fed back by the terminal.
The method of claim 8, wherein deleting the fourth connection includes:

According to the measurement results reported by the terminal, the second DU is determined as the third DU, wherein the reference signal received power RSRP of the cell corresponding to the third DU is less than the first threshold, and/or the reference signal received power RSRP of the cell corresponding to the third DU The signal reception quality RSRQ is less than the second threshold;

Initiate a deletion request to the third DU.
The method according to claim 8, wherein after deleting the fourth connection, the method further includes:

Receive a service deletion response corresponding to the fourth connection;

Send a radio resource control RRC reconfiguration message to the terminal, and receive a reconfiguration completion message fed back by the terminal.
A multi-CU connection management method, including:

Receive the first message from the media access control MAC layer of the terminal, and send the first message to the first Packet Data Convergence Protocol PDCP layer of the terminal;

or,

Receive a second message from the first PDCP layer of the terminal, add the second parameter to the second message, and send the second message to the MAC layer of the terminal;

Wherein, the wireless link control RLC layer of the terminal establishes a connection with at least two PDCPs of the terminal, and the first PDCP layer is one of the at least two PDCPs of the terminal; the at least two PDCPs of the terminal are connected with the network-side device. At least two CUs correspond one to one.
The method of claim 14, wherein the second parameter is used to indicate an RLC channel on which the second message is received.
A multi-CU connection management method, including:

When the first connection has been established between the distribution unit DU and the first concentration unit CU, and the network side device adds a second connection between the DU and the second CU, receive the radio resource control RRC sent by the network side device. A reconfiguration message is sent to the network side device and a reconfiguration completion message is fed back to the network side device.
A multi-CU connection management method, including:

A first connection has been established between the first distribution unit DU and the first centralized unit CU, a second connection has been established between the first DU and the second CU, and the network side device is added between the second DU and the second CU. In the case of the third connection, receive the radio resource control RRC reconfiguration message sent by the network side device, and feed back the reconfiguration completion message to the network side device;

or,

A first connection has been established between the first DU and the first CU, a second connection has been established between the first DU and the second CU, and the network side device deletes the established connection between the second DU and the second CU. In the case of the fourth connection, the radio resource control RRC reconfiguration message sent by the network side device is received, and a reconfiguration completion message is fed back to the network side device.
A multi-CU connection management device, including:

First transceiver for:

Receive the first message sent by the PDCP layer of the first centralized unit CU from the first connection, and after adding the first parameter to the first message, send the first message to the medium of the distribution unit DU Access control MAC layer;

or,

Receive the second message sent by the MAC layer from the first connection, and send the second message to the PDCP layer of the first CU;

Wherein, the DU is connected to at least two CUs, the first CU is one of the at least two CUs, and the first connection is a connection between the first CU and the DU.
A multi-CU connection management device, including:

First processor for:

When the first connection has been established between the distribution unit DU and the first centralized unit CU, in A second connection is established between the DU and the second CU.
A multi-CU connection management device, including:

Second processor for:

When the first connection has been established between the first distribution unit DU and the first centralized unit CU, and the second connection has been established between the first DU and the second CU, establish a connection between the second DU and the second CU. third connection;

or,

When a first connection has been established between the first DU and the first CU, a second connection has been established between the first DU and the second CU, and a fourth connection has been established between the second DU and the second CU, Delete the fourth connection.
A multi-CU connection management device, including:

Fourth transceiver for:

Receive the first message from the media access control MAC layer of the terminal, and send the first message to the first Packet Data Convergence Protocol PDCP layer of the terminal;

or,

Receive a second message from the first PDCP layer of the terminal, add the second parameter to the second message, and send the second message to the MAC layer of the terminal;

Wherein, the wireless link control RLC layer of the terminal establishes a connection with at least two PDCPs of the terminal, and the first PDCP layer is one of the at least two PDCPs of the terminal; the at least two PDCPs of the terminal are connected with the network-side device. At least two CUs correspond one to one.
A multi-CU connection management device, including:

Fifth transceiver for:

When the first connection has been established between the distribution unit DU and the first concentration unit CU, and the network side device adds a second connection between the DU and the second CU, receive the radio resource control RRC sent by the network side device. A reconfiguration message is sent to the network side device and a reconfiguration completion message is fed back to the network side device.
A multi-CU connection management device, including:

Sixth transceiver for:

A first connection has been established between the first distribution unit DU and the first centralized unit CU, a second connection has been established between the first DU and the second CU, and the network side device is between the second DU and the second CU. When a third connection is added, receive the radio resource control RRC reconfiguration message sent by the network side device, and feed back the reconfiguration completion message to the network side device;

or,

A first connection has been established between the first DU and the first CU, a second connection has been established between the first DU and the second CU, and the network side device deletes the established connection between the second DU and the second CU. In the case of the fourth connection, the radio resource control RRC reconfiguration message sent by the network side device is received, and a reconfiguration completion message is fed back to the network side device.
A communication device, including: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor; wherein the processor is used to read the program in the memory to implement the following: The steps in the multi-CU connection management method according to claims 1 or 2; or, the steps in the multi-CU connection management method according to any one of claims 3 to 7; or, as in claims 8 to 13 The steps in the multi-CU connection management method according to any one of the above; or, the steps in the multi-CU connection management method according to claim 14 or 15; or, the multi-CU connection management method according to claim 16 The steps; or, the steps in the multi-CU connection management method as claimed in claim 17.
A readable storage medium for storing a program, wherein when the program is executed by a processor, the steps in the multi-CU connection management method as claimed in claim 1 or 2 are implemented; or, as in claims 3 to 7 The steps in the multi-CU connection management method according to any one of claims 8 to 13; or, the steps in the multi-CU connection management method according to any one of claims 8 to 13; or, the steps according to claims 14 or 15. The steps in the multi-CU connection management method; or the steps in the multi-CU connection management method as claimed in claim 16; or the steps in the multi-CU connection management method as claimed in claim 17.