Information transmission method and device, and storage medium

Abstract

Embodiments of the present application provide an information transmission method and device and a storage medium, and relate to the technical field of communication. The method comprises: a first DU receiving first indication information from a centralized unit (CU); or, if the first DU receives a service cell change and / or addition completion indication message from a user equipment (UE), sending second indication information to the CU; wherein the first indication information and the second indication information are used to indicate that the UE has successfully completed the service cell change and / or addition. The method of the embodiments of the present application, after the UE receives the indication of the service cell change and / or addition completion sent by the air interface, informs the network side by sending the indication information. If the CU receives the indication information, the indication information is transmitted to the DU; if the DU receives the indication information, the indication information is transmitted to the CU, thereby solving the problem of how to transmit the service cell change and / or addition success indication between the CU / DU interface after the UE triggers the service cell change and / or addition success through the L1 / L2 signaling.

Description

Technical Field

[0001] This application relates to the field of communication technology, and more specifically, to an information transmission method, apparatus, and computer-readable storage medium. Background Technology

[0002] The network side triggers a handover command for the UE serving cell based on the Layer 3 (L3) measurement results. During the handover, the Radio Link Control (RLC) layer and the Medium Access Control (MAC) layer need to be completely rebuilt. The Packet Data Convergence Control (PDCP) layer may also be rebuilt or undergo a PDCP recovery process, resulting in a large delay.

[0003] Therefore, support for Layer 1 or Layer 2 (L1 / L2) mobility can be triggered by L1 / L2 signaling to change and / or add serving cells. How to indicate to the Centralized Unit / Distributed Unit (CU / DU) that the UE has successfully accessed the target cell after it has connected is a problem that urgently needs to be solved. Summary of the Invention

[0004] This application provides an information transmission method, apparatus, and computer-readable storage medium, which can solve at least one technical problem in the prior art.

[0005] Firstly, an information transmission method is provided, applied to a first distributed unit (DU), the method comprising:

[0006] Receive first indication information from the central unit CU; or,

[0007] If a serving cell change and / or addition completion indication message is received from a user equipment (UE), a second indication message is sent to the CU;

[0008] The first indication information and the second indication information are used to indicate that the UE has successfully completed the change and / or addition of serving cell.

[0009] In one possible implementation, after receiving the first indication information from the central unit CU, the method further includes:

[0010] The target cell of the UE is activated according to the first instruction information.

[0011] In yet another possible implementation, the method further includes:

[0012] Feedback information is sent to the CU to indicate that the UE context modification under the first DU is complete.

[0013] In another possible implementation, the feedback information of the first indication information includes some or all of the information in the first indication information, and the feedback information of the first indication information is sent in the same way as the first indication information.

[0014] In another possible implementation, the first indication information and the second indication information include at least one of the following:

[0015] UE identification information;

[0016] The UE's current serving cell identifier;

[0017] Service cell change and / or addition completion indication;

[0018] Beam index;

[0019] Transmission Configuration Indicator (TCI) identifier.

[0020] In another possible implementation, the method of sending the first indication information and the second indication information includes at least one of the following:

[0021] Send messages via the newly defined interface;

[0022] Send messages via the F1 interface;

[0023] Messages are sent via the extended F1 interface.

[0024] Secondly, an information transmission method is provided, applied to a centralized unit (CU), the method comprising:

[0025] Receive second indication information from the first distribution unit (DU); or,

[0026] If a serving cell change and / or addition completion indication message is received from a user equipment (UE), the first indication information is sent to the first DU.

[0027] The first indication information and the second indication information are used to indicate that the UE has successfully completed the change and / or addition of serving cell.

[0028] In one possible implementation, after receiving the second indication information from the first distribution unit DU, the method further includes:

[0029] Based on the second instruction information, it is determined that the UE's current serving cell has been changed to the target cell under the first DU.

[0030] In yet another possible implementation, the method further includes:

[0031] Feedback information of the second indication information is sent to the first DU to indicate the modification of the UE context under the first DU;

[0032] Send a third indication message to the second DU, the third indication message being used to indicate the modification and / or release of the UE context under the second DU.

[0033] In another possible implementation, if a serving cell change and / or addition completion indication message is received from a user equipment (UE), the method further includes:

[0034] Feedback information received from the first indication information sent by the first DU is used to indicate that the UE context modification under the first DU is complete;

[0035] Send a third indication message to the second DU, the third indication message being used to indicate the modification and / or release of the UE context under the second DU.

[0036] In another possible implementation, the method further includes:

[0037] Establish a new transmission channel with the first DU;

[0038] Disconnect the transmission channel with the second DU.

[0039] In another possible implementation, the method further includes:

[0040] If downlink data transmission status information is received from the second DU, the downlink data that was not successfully transmitted is retransmitted to the first DU.

[0041] In another possible implementation, the method further includes at least one of the following operations:

[0042] Send a fourth indication message to the third DU, the fourth indication message being used to indicate modification and / or release of the UE context under the third DU;

[0043] Send a fifth indication message to the fourth DU, the fifth indication message being used to indicate the establishment of a UE context under the fourth DU;

[0044] The system receives feedback information of the third indication information sent by the second DU and sends a sixth indication information to the UE. The feedback information of the third indication information is used to indicate that the modification and / or release of the UE context under the second DU is completed, and the sixth indication information is used to indicate that the current serving cell change and / or addition process of the UE is completed.

[0045] In another possible implementation, the feedback information of the second indication information, the third indication information, the fourth indication information, the fifth indication information, the feedback information of the third indication information, and the sixth indication information all include some or all of the information in the second indication information;

[0046] The feedback information of the second indication information, the third indication information, the fourth indication information, the fifth indication information, the feedback information of the third indication information, and the sixth indication information are all sent using the same method as the second indication information.

[0047] In another possible implementation, the first indication information and the second indication information include at least one of the following:

[0048] UE identification information;

[0049] The UE's current serving cell identifier;

[0050] Service cell change and / or addition completion indication;

[0051] Beam index;

[0052] Transmission Configuration Indicator (TCI) identifier.

[0053] In another possible implementation, the method of sending the first indication information and the second indication information includes at least one of the following:

[0054] Send messages via the newly defined interface;

[0055] Send messages via the F1 interface;

[0056] Messages are sent via the extended F1 interface.

[0057] Thirdly, an information transmission method is provided, applied to a second distributed unit (DU), the method comprising:

[0058] Receive third indication information from the central unit (CU), the third indication information being used to indicate modification and / or release of the UE context under the second DU;

[0059] Stop transmitting downlink data and send downlink data transmission status information to the CU.

[0060] In one possible implementation, the method further includes:

[0061] Feedback information of the third indication information is sent to the CU, the feedback information of the third indication information is used to indicate that the modification and / or release of the UE context under the second DU is completed.

[0062] In another possible implementation, the feedback information of the third indication information is sent using the method for sending the third indication information, wherein the method for sending the third indication information includes at least one of the following:

[0063] Send messages via the newly defined interface;

[0064] Send messages via the F1 interface;

[0065] Messages are sent via the extended F1 interface.

[0066] In another possible implementation, the third indication information includes at least one of the following:

[0067] UE identification information;

[0068] The UE's current serving cell identifier;

[0069] Service cell change and / or addition completion indication;

[0070] Beam index;

[0071] Transmission Configuration Indicator (TCI) identifier.

[0072] Fourthly, an information transmission device is provided, applied to a first distribution unit (DU), the device comprising:

[0073] The first receiving module is configured to receive first indication information from the centralized unit (CU); or...

[0074] The first sending module is configured to send second indication information to the CU if it receives a serving cell change and / or addition completion indication message from the user equipment UE.

[0075] The first indication information and the second indication information are used to indicate that the UE has successfully completed the change and / or addition of serving cell.

[0076] One possible implementation also includes:

[0077] The first execution module is configured to activate the target cell of the UE according to the first indication information received from the central unit CU.

[0078] In yet another possible implementation, the first sending module is further configured to:

[0079] Feedback information is sent to the CU to indicate that the UE context modification under the first DU is complete.

[0080] In another possible implementation, the feedback information of the first indication information includes some or all of the information in the first indication information, and the feedback information of the first indication information is sent in the same way as the first indication information.

[0081] In another possible implementation, the first indication information and the second indication information include at least one of the following:

[0082] UE identification information;

[0083] The UE's current serving cell identifier;

[0084] Service cell change and / or addition completion indication;

[0085] Beam index;

[0086] Transmission Configuration Indicator (TCI) identifier.

[0087] In another possible implementation, the method of sending the first indication information and the second indication information includes at least one of the following:

[0088] Send messages via the newly defined interface;

[0089] Send messages via the F1 interface;

[0090] Messages are sent via the extended F1 interface.

[0091] Fifthly, an information transmission device is provided for use in a centralized unit (CU), the device comprising:

[0092] The second receiving module is used to receive second indication information from the first distribution unit (DU); or...

[0093] The second sending module is configured to send first indication information to the first DU if it receives a serving cell change and / or addition completion indication message from the user equipment (UE).

[0094] The first indication information and the second indication information are used to indicate that the UE has successfully completed the change and / or addition of serving cell.

[0095] In one possible implementation, a determining module is further included, which determines, based on the second indication information, that the UE's current serving cell has been switched to the target cell under the first DU.

[0096] In one possible implementation, the second sending module is further configured to:

[0097] Feedback information of the second indication information is sent to the first DU to indicate the modification of the UE context under the first DU;

[0098] Send a third indication message to the second DU, the third indication message being used to indicate the modification and / or release of the UE context under the second DU.

[0099] In one possible implementation, if a serving cell change and / or addition completion indication message is received from a user equipment (UE), the second receiving module is further configured to:

[0100] Feedback information received from the first indication information sent by the first DU is used to indicate that the UE context modification under the first DU is complete;

[0101] The second sending module is further configured to:

[0102] Send a third indication message to the second DU, the third indication message being used to indicate the modification and / or release of the UE context under the second DU.

[0103] Another possible implementation includes:

[0104] The second execution module is used to establish a new transmission channel with the first DU and disconnect the transmission channel with the second DU.

[0105] In another possible implementation, the second sending module is further configured to:

[0106] If downlink data transmission status information is received from the second DU, the downlink data that was not successfully transmitted is retransmitted to the first DU.

[0107] In another possible implementation, the second sending module is further configured to perform at least one of the following:

[0108] Send a fourth indication message to the third DU, the fourth indication message being used to indicate modification and / or release of the UE context under the third DU;

[0109] Send a fifth indication message to the fourth DU, the fifth indication message being used to indicate the establishment of a UE context under the fourth DU;

[0110] The second receiving module is further configured to:

[0111] The system receives feedback information of the third indication information sent by the second DU and sends a sixth indication information to the UE. The feedback information of the third indication information is used to indicate that the modification and / or release of the UE context under the second DU is completed, and the sixth indication information is used to indicate that the current serving cell change and / or addition process of the UE is completed.

[0112] In another possible implementation, the feedback information of the second indication information, the third indication information, the fourth indication information, the fifth indication information, the feedback information of the third indication information, and the sixth indication information all include some or all of the information in the second indication information;

[0113] The feedback information of the second indication information, the third indication information, the fourth indication information, the fifth indication information, the feedback information of the third indication information, and the sixth indication information are all sent using the same method as the second indication information.

[0114] In another possible implementation, the first indication information and the second indication information include at least one of the following:

[0115] UE identification information;

[0116] The UE's current serving cell identifier;

[0117] Service cell change and / or addition completion indication;

[0118] Beam index;

[0119] Transmission Configuration Indicator (TCI) identifier.

[0120] In another possible implementation, the method of sending the first indication information and the second indication information includes at least one of the following:

[0121] Send messages via the newly defined interface;

[0122] Send messages via the F1 interface;

[0123] Messages are sent via the extended F1 interface.

[0124] Sixthly, an information transmission device is provided for use in a second distribution unit (DU), the device comprising:

[0125] The third receiving module is used to receive third indication information from the central unit CU, the third indication information being used to indicate modification and / or release of the UE context under the second DU;

[0126] The third sending module is used to stop transmitting downlink data and send downlink data transmission status information to the CU.

[0127] In one possible implementation, the third sending module is further configured to:

[0128] Feedback information of the third indication information is sent to the CU, the feedback information of the third indication information is used to indicate that the modification and / or release of the UE context under the second DU is completed.

[0129] In another possible implementation, the feedback information of the third indication information is sent using the method for sending the third indication information, wherein the method for sending the third indication information includes at least one of the following:

[0130] Send messages via the newly defined interface;

[0131] Send messages via the F1 interface;

[0132] Messages are sent via the extended F1 interface.

[0133] In another possible implementation, the third indication information includes at least one of the following:

[0134] UE identification information;

[0135] The UE's current serving cell identifier;

[0136] Service cell change and / or addition completion indication;

[0137] Beam index;

[0138] Transmission Configuration Indicator (TCI) identifier.

[0139] Seventhly, a distributed unit DU is provided, comprising:

[0140] Memory, used to store computer programs;

[0141] Transceiver, used to send and receive data under the control of the processor;

[0142] A processor is configured to read and execute a computer program from the memory to implement the information transmission method shown in the first or third aspect of this application.

[0143] Eighthly, a centralized unit CU is provided, comprising:

[0144] Memory, used to store computer programs;

[0145] Transceiver, used to send and receive data under the control of the processor;

[0146] A processor is configured to read and execute a computer program from the memory to implement the information transmission method described in the second aspect of this application.

[0147] Ninthly, a processor-readable storage medium is provided, the processor-readable storage medium storing a computer program, the computer program being used to cause a processor to execute and implement the information transmission method shown in the first, second, or third aspect of this application.

[0148] The beneficial effects of the technical solution provided in this application are:

[0149] After the UE receives the indication from the air interface that the serving cell change and / or addition is complete, it notifies the network side by sending an indication message. If the CU receives the indication message sent by the UE, it transmits the indication message to the DU; if the DU receives the indication message sent by the UE, it transmits the indication message to the CU. This solves the problem of how to transmit the indication of successful serving cell change and / or addition between the CU and DU interfaces after the UE successfully triggers the serving cell change and / or addition through L1 / L2 signaling. Attached Figure Description

[0150] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below.

[0151] Figure 1 This is a schematic diagram illustrating the process of changing the serving cell in related technologies;

[0152] Figure 2 A flowchart illustrating an information transmission method provided in an embodiment of this application;

[0153] Figure 3 A flowchart illustrating an information transmission method according to another embodiment of this application;

[0154] Figure 4 A flowchart illustrating an information transmission method according to another embodiment of this application;

[0155] Figure 5 A flowchart illustrating an information transmission method provided for another embodiment of this application;

[0156] Figure 6 A flowchart illustrating an information transmission method according to another embodiment of this application;

[0157] Figure 7 A flowchart illustrating an information transmission method according to another embodiment of this application;

[0158] Figure 8 A flowchart illustrating an information transmission method according to another embodiment of this application;

[0159] Figure 9 A schematic diagram illustrating the interaction process of an information transmission method provided in an embodiment of this application;

[0160] Figure 10 A schematic diagram of the interaction process of an information transmission method provided in another embodiment of this application;

[0161] Figure 11aThis application provides an illustration of an application scenario. Figure 1 ;

[0162] Figure 11b This application provides an illustration of an application scenario. Figure 2 ;

[0163] Figure 11c This application provides an illustration of an application scenario. Figure 3 ;

[0164] Figure 12 This is a schematic diagram of the structure of an information transmission device provided in an embodiment of this application;

[0165] Figure 13 A schematic diagram of the structure of an information transmission device provided in another embodiment of this application;

[0166] Figure 14 A schematic diagram of the structure of an information transmission device provided in another embodiment of this application;

[0167] Figure 15 This is a schematic diagram of the structure of a distribution unit (DU) provided in an embodiment of this application;

[0168] Figure 16 This application provides a schematic diagram of the structure of a centralized unit (CU) according to an embodiment of the present application.

[0169] Figure 17 This is a schematic diagram of the structure of a distribution unit (DU) provided in an embodiment of this application. Detailed Implementation

[0170] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting the invention.

[0171] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0172] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0173] The technical solutions provided in this application can be applied to various systems, especially 5G systems. For example, applicable systems include Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS), Long Term Evolution (LTE), LTE Frequency Division Duplex (FDD), LTE Time Division Duplex (TDD), Long Term Evolution Advanced (LTE-A), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX), and 5G New Radio (NR). All of these systems include terminal equipment and network-side equipment. The systems may also include a core network component, such as Evolved Packet System (EPS) and 5G systems (5GS).

[0174] First, let's introduce and explain several terms used in this application:

[0175] The terminal devices involved in the embodiments of this application can be devices that provide voice and / or data connectivity to users, handheld devices with wireless connectivity, or other processing devices connected to a wireless modem. The names of the terminal devices may differ in different systems; for example, in a 5G system, a terminal device can be called User Equipment (UE). Wireless terminal devices can communicate with one or more core networks (CNs) via a Radio Access Network (RAN). Wireless terminal devices can be mobile terminal devices, such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, for example, portable, pocket-sized, handheld, computer-embedded, or vehicle-mounted mobile devices that exchange voice and / or data with the RAN. Examples include Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). Wireless terminal equipment can also be referred to as a system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point, remote terminal, access terminal, user terminal, user agent, or user device, but is not limited to these terms in the embodiments of this application.

[0176] The network-side equipment involved in this application embodiment can be a base station, which may include multiple cells providing services to terminals. Depending on the specific application, a base station may also be called an access point, or a device in the access network that communicates with wireless terminal devices through one or more sectors on the air interface, or other names. The network-side equipment can be used to exchange received air frames with Internet Protocol (IP) packets, acting as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) communication network. The network-side equipment can also coordinate the attribute management of the air interface.

[0177] For example, the network-side equipment involved in the embodiments of this application can be a base transceiver station (BTS) in Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), a network-side device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), an evolved network-side device (eNB or e-NodeB) in a long term evolution (LTE) system, a 5G base station (gNB) in a next generation system, a Home evolved Node B (HeNB), a relay node, a femto, a pico, etc., and is not limited in the embodiments of this application. In some network structures, the network-side equipment may include centralized unit (CU) nodes and distributed unit (DU) nodes, and the centralized unit and distributed unit may also be geographically separated.

[0178] Network-side equipment and terminal equipment can each use one or more antennas for Multiple Input Multiple Output (MIMO) transmission. MIMO transmission can be Single User MIMO (SU-MIMO) or Multiple User MIMO (MU-MIMO). Depending on the configuration and number of antenna combinations, MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, and can also be diversity transmission, precoding transmission, or beamforming transmission, etc.

[0179] Currently, UE handover is based on L3 measurement. Taking intra-CU inter-DU handover as an example, the gNB decides to initiate handover based on the L3 measurement report reported by the UE, moving to a cell with better service quality. The main process is as follows: Figure 1 As shown, it includes the following steps:

[0180] 1. The CU initiates a UE context establishment request to the target DU through the F1 interface;

[0181] 2. After the target DU resources are ready, initiate a UE context establishment response to the CU;

[0182] 3. The CU sends a UE context change request to the source DU;

[0183] 4. The source DU sends an RRC reconfiguration message to the UE, triggering RRC reconfiguration;

[0184] 5. The source DU sends a UE context change response message to the CU;

[0185] 6. After the RRC reconfiguration is completed, the UE sends a reconfiguration completion message to the target DU;

[0186] 7. The target DU transmits the reconfiguration completion message to the gNB-CU via an uplink RRC message;

[0187] 8. The CU then sends a UE context release message to the source DU, instructing that the UE context be released;

[0188] 9. After the source DU context is released, a UE context release completion message is sent, and the handover is complete.

[0189] Studies on L1 / L2 mobility in intra-DU scenarios do not require the CU to understand underlying changes. However, studies on L1 / L2 mobility in inter-DU scenarios require the CU to understand the underlying conditions to perform scheduling in the control and data planes. If a UE undergoes L1 / L2 mobility—that is, after the UE successfully triggers a serving cell change and / or addition via L1 / L2 signaling—how to transmit the serving cell change and / or addition success indication between the CU / DU interfaces presents a new challenge.

[0190] Therefore, the information transmission method, apparatus, and computer-readable storage medium in the embodiments of this application aim to solve the problem of how to transmit the successful indication of serving cell change and / or addition to the CU / DU interface after the UE triggers the serving cell change and / or addition successfully through L1 / L2 signaling.

[0191] Specifically, the information transmission scheme provided in this application is for L1 / L2 mobility scenarios involving inter-DU and intra-CU. In this scenario, the UE performs serving cell changes and / or additions between two DUs under the same CU. After receiving an indication from the air interface that the serving cell change and / or addition is complete, the UE needs to send an indication message to the network side. After receiving the indication message, the CU needs to inform the DU through the F1 interface, or the DU needs to inform the CU through the F1 interface after receiving the indication message. After receiving the indication message, the CU and DU perform corresponding operations, including but not limited to: the CU changing the data channel between the source DU and the target DU, the target DU updating the UE context to provide services to the UE, the source DU disconnecting from the UE, lossless processing of data packets in Acknowledged Mode (AM mode), processing of the source cell, candidate cell, or target cell, and feedback on serving cell changes, etc.

[0192] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0193] This application provides an information transmission method, such as... Figure 2 As shown, the execution subject of this method can be the first distribution unit DU (which can also be described as the target DU below). The method includes:

[0194] S101a, Receive the first instruction information from the centralized unit CU.

[0195] The first indication information is used to indicate that the UE has successfully completed the change and / or addition of serving cell.

[0196] or,

[0197] S101b, Receive a serving cell change and / or addition completion indication message from the user equipment (UE);

[0198] S102b: Send a second instruction message to the CU.

[0199] The second indication information is used to indicate that the UE has successfully completed the change and / or addition of serving cell.

[0200] The method provided in this application embodiment, after the UE receives an indication from the air interface that the serving cell change and / or addition is complete, informs the network side by sending an indication message. If the CU receives the indication message sent by the UE, it transmits the indication message to the DU; if the DU receives the indication message sent by the UE, it transmits the indication message to the CU. This solves the problem of how to transmit the indication of successful serving cell change and / or addition between the CU and DU interfaces after the UE successfully triggers the serving cell change and / or addition through L1 / L2 signaling.

[0201] In one possible implementation, such as Figure 3 As shown, after S101a, the method further includes:

[0202] S102a. Activate the target cell of the UE according to the first instruction information.

[0203] In another possible implementation, such as Figure 3 As shown, the method further includes:

[0204] S103a, Send feedback information of the first indication information to the CU, for the completion of UE context modification under the first DU.

[0205] In this embodiment, the feedback information of the first indication information includes some or all of the information in the first indication information, and the feedback information of the first indication information is sent in the same way as the first indication information.

[0206] It should be noted that, in this embodiment, if the CU receives feedback information of the first indication information sent by the target DU, it can send a sixth indication information to the UE. The sixth indication information is used to indicate that the current serving cell change and / or addition process of the UE is complete.

[0207] In the above embodiments, the first indication information and the second indication information include at least one of the following:

[0208] UE identification information;

[0209] The UE's current serving cell identifier;

[0210] Service cell change and / or addition completion indication;

[0211] Beam index;

[0212] Transport Configuration Indication (TCI) identifier.

[0213] Specifically, in this embodiment, the UE's identification information can be the Cell Radio Network Temporary Identifier (C-RNTI) and / or the Configured Scheduling Radio Network Temporary Identifier (CS-RNTI), while the beam index and TCI are used to inform the network side which beams the UE will use after access.

[0214] It should be noted that the indication of completion of service cell change and / or addition can be explicit or implicit.

[0215] The methods for sending the first indication information and the second indication information include at least one of the following:

[0216] Send messages via the newly defined interface;

[0217] Send messages via the F1 interface;

[0218] Messages are sent via the extended F1 interface.

[0219] It should be noted that the newly defined interface messages are UE-related messages.

[0220] In one optional embodiment: after the target DU receives the serving cell change / addition completion indication from the air interface, it sends a second indication information to the CU through the F1 interface. The second indication information can indicate that the UE on the CU has successfully accessed the cell under the target DU.

[0221] In this embodiment, a dedicated F1 interface message can be created to transmit the second indication information, or an existing uplink F1 interface message can be extended. For example, an information element (IE) can be added to the UE context modification request message to carry the second indication information. This message can be called an extended UE context modification request message. Alternatively, an existing uplink F1 interface message can be reused.

[0222] In another alternative embodiment: the target DU receives first indication information sent by the CU via the F1 interface, and activates the target cell according to the content of the first indication information. Optionally, after successfully activating the serving cell, the target DU sends feedback information of the first indication information to the CU, indicating that the UE context modification under the target DU is complete.

[0223] In this embodiment, a dedicated F1 interface message can be created to transmit the first indication information, or the existing downlink F1 interface message can be extended. For example, the UE context modification request message can be extended to carry the first indication information. Alternatively, the existing downlink F1 interface message can be reused.

[0224] In this embodiment, a dedicated F1 interface message can be created to transmit feedback information of the first indication information, or existing uplink F1 interface messages can be reused, for example, the UE context modification response message can be reused, or existing uplink F1 interface messages can be extended.

[0225] This application provides an information transmission method, such as... Figure 4 As shown, this method can be executed by a centralized unit (CU), and the method includes:

[0226] S201a, Receive second instruction information from the first distribution unit DU.

[0227] The second indication information is used to indicate that the UE has successfully completed the change and / or addition of serving cell.

[0228] or,

[0229] S201b, Receive a serving cell change and / or addition completion indication message from the user equipment (UE);

[0230] S202b: Send the first instruction information to the first DU.

[0231] The first indication information is used to indicate that the UE has successfully completed the change and / or addition of serving cell.

[0232] The method provided in this application embodiment, after the UE receives an indication from the air interface that the serving cell change and / or addition is complete, informs the network side by sending an indication message. If the CU receives the indication message sent by the UE, it transmits the indication message to the DU; if the DU receives the indication message sent by the UE, it transmits the indication message to the CU. This solves the problem of how to transmit the indication of successful serving cell change and / or addition between the CU and DU interfaces after the UE successfully triggers the serving cell change and / or addition through L1 / L2 signaling.

[0233] In one possible implementation, such as Figure 5 As shown, after S201a, the method may further include:

[0234] S202a. Based on the second instruction information, it is determined that the UE's current serving cell has been changed to the target cell under the first DU.

[0235] In another possible implementation, such as Figure 5 As shown, the method may further include:

[0236] S203a. Send feedback information of the second indication information to the first DU to indicate the modification of the UE context under the first DU;

[0237] S204a. Send a third indication message to the second DU (which may also be described as the source DU below), the third indication message being used to indicate the modification and / or release of the UE context under the second DU.

[0238] In another possible implementation, after S201b, the method may further include:

[0239] S203b (not shown in the figure) receives feedback information of the first indication information sent by the first DU, which is used to indicate that the UE context modification under the first DU is complete.

[0240] S204b (not shown in the figure) sends a third indication message to the second DU, the third indication message being used to indicate modification and / or release of the UE context under the second DU.

[0241] In another possible implementation, such as Figure 6 As shown, the method may further include:

[0242] S205. Establish a new transmission channel with the first DU;

[0243] S206. Disconnect the transmission channel with the second DU.

[0244] In another possible implementation, such as Figure 6 As shown, the method may further include:

[0245] S207. If downlink data transmission status information is received from the second DU, the downlink data that was not successfully transmitted is retransmitted to the first DU.

[0246] In this embodiment, after the CU learns that the UE has completed the service cell change and / or addition, it needs to establish a new data transmission channel with the target cell under the target DU. The CU resends the data that was not successfully transmitted to the target DU according to the downlink data transmission status of the source DU, which can ensure lossless data transmission.

[0247] It should be noted that, Figure 6 The solution for ensuring lossless data transmission is shown only when the CU receives the second indication information from the target DU. When the CU receives the first indication information from the UE via the air interface, lossless data transmission can also be ensured through steps S205-S207.

[0248] In another possible implementation, the method may also include at least one of the following operations:

[0249] Send a fourth indication message to the third DU, the fourth indication message being used to indicate modification and / or release of the UE context under the third DU;

[0250] Send a fifth indication message to the fourth DU, the fifth indication message being used to indicate the establishment of a UE context under the fourth DU;

[0251] The system receives feedback information of the third indication information sent by the second DU and sends a sixth indication information to the UE. The feedback information of the third indication information is used to indicate that the modification and / or release of the UE context under the second DU is completed, and the sixth indication information is used to indicate that the current serving cell change and / or addition process of the UE is completed.

[0252] Specifically, in this embodiment, the third DU can also be described as a candidate DU, which can be one or more. The fourth DU can also be described as a non-candidate DU, which can be one or more. A fifth indication message is sent to the non-candidate DUs to instruct the creation of one or more new candidate DUs.

[0253] In other words, the information transmission method provided in this application embodiment can also dynamically manage candidate cells through the F1 interface after the CU learns that the UE has changed and / or added a serving cell.

[0254] It should be noted that, in the embodiments of this application, the feedback information of the second indication information, the third indication information, the fourth indication information, the fifth indication information, the feedback information of the third indication information, and the sixth indication information all include some or all of the information in the second indication information;

[0255] The feedback information of the second indication information, the third indication information, the fourth indication information, the fifth indication information, the feedback information of the third indication information, and the sixth indication information are all sent using the same method as the second indication information.

[0256] It should also be noted that after receiving feedback of the third instruction information from the source DU and / or feedback of the first instruction information from the target DU, the CU can send a sixth instruction information to the UE, indicating that the change and / or addition of the UE's current serving cell has been completed.

[0257] In the above embodiments, the first indication information and the second indication information include at least one of the following:

[0258] UE identification information;

[0259] The UE's current serving cell identifier;

[0260] Service cell change and / or addition completion indication;

[0261] Beam index;

[0262] Transmission Configuration Indicator (TCI) identifier.

[0263] Specifically, in this embodiment, the beam index and TCI are used to inform the network side which beams the UE will use after access. It should be noted that the serving cell change and / or addition completion indication can be explicit or implicit.

[0264] The methods for sending the first indication information and the second indication information include at least one of the following:

[0265] Send messages via the newly defined interface;

[0266] Send messages via the F1 interface;

[0267] Messages are sent via the extended F1 interface.

[0268] It should be noted that the newly defined interface messages are UE-related messages.

[0269] In one optional embodiment: the CU receives second indication information sent by the target DU through the F1 interface, and confirms that the UE has successfully switched to the cell under the target DU based on the second indication information.

[0270] Optionally, after receiving the second instruction information, the CU performs one or more of the following operations:

[0271] 1. Activate the target cell under the target DU: Send a second indication information feedback to the target DU via the F1 interface. The feedback information of the second indication information indicates that the UE context under the target DU should be modified. The first indication information feedback includes part or all of the content of the first indication information and activates the corresponding target cell. The first indication information feedback can reuse the original message, define a new message, or extend the original message.

[0272] 2. Adjust the source cell under the source DU: Send a third indication message to the source DU via the F1 interface. The third indication message may include part or all of the content of the first indication message, and is used to indicate the modification of the UE context under the source DU to activate or release the corresponding source cell. The third indication message can reuse the original message, define a new message, or extend the original message.

[0273] 3. Adjust candidate cells under candidate DU:

[0274] 3.1 Send a fourth indication message to the candidate DU via the F1 interface. The fourth indication message may include part or all of the content of the first indication message, and is used to indicate the modification and / or release of the UE context under the candidate DU, to activate or release the corresponding candidate cell. The fourth indication message may reuse the original message, define a new message, or extend the original message.

[0275] 3.2 Send a fifth indication message to the non-candidate DU via the F1 interface. The fifth indication message may include part or all of the content of the first indication message, and is used to indicate the establishment of a UE context under the non-candidate DU and the establishment of a new candidate cell. The fifth indication message may reuse the original message, define a new message, or extend the original message.

[0276] Optionally, after receiving the second instruction information, the CU performs the following operations on the data plane:

[0277] A new transmission channel is established between the CU and the target DU;

[0278] The CU disconnects the data transmission channel from the source DU.

[0279] Optionally, after receiving the downlink data transmission status from the source DU, the CU retransmits the downlink data that was not successfully transmitted.

[0280] Optionally, when the CU receives the third indication information feedback from the UE sent by the source DU, it sends a sixth indication information to the UE, indicating that the current serving cell change and / or addition has been completed.

[0281] In another alternative embodiment: after the CU receives a serving cell change / addition completion indication from the air interface, the control plane performs one or more of the following operations:

[0282] 1. For the target cell: Send the first indication information to the target DU through the F1 interface to notify the target DU that the current UE has successfully completed the change and / or addition of the serving cell.

[0283] 2. For the source cell: A third indication message is sent to the source DU via the F1 interface. The third indication message may include part or all of the content of the first indication message, and is used to instruct the modification of the UE context under the source DU to activate or release the corresponding source cell. The third indication message may reuse the original message, define a new message, or extend the original message.

[0284] 3. For candidate cells:

[0285] 3.1. A fourth indication message is sent to the candidate DU via the F1 interface. This fourth indication message may include a portion of the first indication message and is used to instruct the modification and / or release of the UE context under the candidate DU, thereby activating or releasing the corresponding candidate cell. The fourth indication message may reuse existing messages, define new messages, or extend existing messages.

[0286] 3.2 A fifth indication message is sent to a non-candidate DU via the F1 interface. The fifth indication message may include the contents of the first indication message, and is used to indicate the establishment of a UE context under the non-candidate DU and the establishment of a new candidate cell. The fifth indication message may reuse the original message, define a new message, or extend the original message.

[0287] After receiving the serving cell change / addition completion indication from the air interface, the CU performs the following operations on the data plane:

[0288] A new transmission channel is established between the CU and the target DU;

[0289] The CU disconnects the data transmission channel from the source DU.

[0290] Optionally, after receiving the downlink data transmission status from the source DU, the CU retransmits the downlink data that was not successfully transmitted.

[0291] Optionally, after receiving the third indication information feedback from the source DU, the CU sends a sixth indication information to the UE, indicating that the current serving cell change and / or addition process has been completed. The sixth indication information can reuse the original message, define a new message, or extend the original message.

[0292] In the above embodiments, the sixth indication information includes at least one of the following:

[0293] UE identification information;

[0294] The UE's current serving cell identifier;

[0295] Service cell change and / or addition completion indication;

[0296] Beam index;

[0297] Transmission Configuration Indicator (TCI) identifier;

[0298] UE context modification complete indication

[0299] The sixth instruction information is sent in a manner that includes at least one of the following:

[0300] Reuse the original downlink interface messages;

[0301] Define a new downlink interface message.

[0302] This application provides an information transmission method, such as... Figure 7 As shown, this method can be executed by a second distribution unit DU (which can also be described as a source DU below), and the method includes:

[0303] S301. Receive third indication information from the central unit CU, the third indication information being used to indicate modification and / or release of the UE context under the second DU;

[0304] S302. Stop transmitting downlink data and send downlink data transmission status information to the CU.

[0305] In another possible implementation, such as Figure 8 As shown, the method may further include:

[0306] S303. Send feedback information of the third indication information to the CU, wherein the feedback information of the third indication information is used to indicate that the modification and / or release of the UE context under the second DU is completed.

[0307] In the above embodiments, the third indication information includes at least one of the following:

[0308] UE identification information;

[0309] The UE's current serving cell identifier;

[0310] Service cell change and / or addition completion indication;

[0311] Beam index;

[0312] Transmission Configuration Indicator (TCI) identifier.

[0313] Specifically, in this embodiment, the beam index and TCI are used to inform the network side which beams the UE will use after access. It should be noted that the serving cell change and / or addition completion indication can be explicit or implicit.

[0314] The feedback information of the third indication information is sent using the method for sending the third indication information, wherein the method for sending the third indication information includes at least one of the following:

[0315] Send messages via the newly defined interface;

[0316] Send messages via the F1 interface;

[0317] Messages are sent via the extended F1 interface.

[0318] It should be noted that the newly defined interface messages are UE-related messages.

[0319] In one alternative embodiment: after receiving the third indication information sent by the CU through the F1 interface, the source DU stops downlink data transmission and sends the current downlink data transmission status to the CU.

[0320] In another alternative embodiment: after receiving the third indication information from the CU via the F1 interface, the source DU sends feedback information of the third indication information to the CU, indicating that the current serving cell change and / or addition process is complete. The feedback information of the third indication information can reuse existing messages, define new messages, or extend existing messages.

[0321] The following is combined Figures 9 to 11c The technical solution of an information transmission method provided in the embodiments of this application will be described in detail.

[0322] Example 1:

[0323] like Figure 9 The method shown includes:

[0324] S401, the target DU receives the serving cell change and / or addition completion indication message sent by the UE through the air interface.

[0325] S402, the target DU transmits the second indication information to the CU. This second indication information is used to notify the CU that the current UE has undergone a serving cell change and / or addition, and has successfully accessed the cell under the target DU.

[0326] The second instruction information includes at least one of the following:

[0327] UE identification information;

[0328] The UE's current serving cell identifier;

[0329] Service cell change and / or addition completion indication;

[0330] Beam index;

[0331] Transmission Configuration Indicator (TCI) identifier.

[0332] In this embodiment, the method of sending the second indication information includes at least one of the following:

[0333] Send messages via the newly defined interface;

[0334] Send messages via the F1 interface;

[0335] Messages are sent via the extended F1 interface.

[0336] In other words, a dedicated F1 interface message can be created to transmit the second indication information, or the existing uplink F1 interface message can be extended. For example, the second indication information can be added to the UE context modification request message. This message can be called an extended UE context modification request message. Alternatively, the existing uplink F1 interface message can be reused.

[0337] The CU confirms, based on the second instruction information, that the UE has successfully switched to the cell under the target DU.

[0338] After receiving the second instruction information, S403a and CU send feedback information of the second instruction information to the target DU.

[0339] The feedback information of the second indication information is used to instruct the modification of the UE context under the target DU. The feedback information of the second indication information includes part or all of the content of the second indication information. The feedback information of the second indication information can reuse existing messages, define new messages, or extend existing messages. For example, it can reuse existing downlink F1 interface messages, such as the UE context modification response message; it can also create a dedicated F1 interface message to transmit the feedback information of the second indication information; and it can also extend existing downlink F1 interface messages.

[0340] After receiving the second instruction information, S403b and CU send a third instruction information to the source DU. The third instruction information is used to indicate whether to modify or release the UE context under the source DU and to request to deactivate or release the source cell.

[0341] The third indication information may include part or all of the content of the second indication information. The third indication information may reuse existing messages, define new messages, or extend existing messages. For example, it may reuse existing downlink F1 interface messages, such as reusing the UE context modification or release request message, or it may create a new dedicated F1 interface message to transmit the third indication information, or it may extend existing downlink F1 interface messages.

[0342] After receiving the second instruction, the CU establishes a new transmission channel with the target DU and disconnects the data transmission channel with the source DU.

[0343] S404b1 After receiving the third indication information and completing the UE context modification, the source DU sends feedback information of the third indication information to the CU, indicating that the modification and / or release of the UE context under the source DU is complete.

[0344] The third indication information feedback can reuse existing messages, define new messages, or extend existing messages. For example, it can reuse existing downlink F1 interface messages, such as reusing the UE context modification or release response message, or it can create a new dedicated F1 interface message to transmit the feedback information of the third indication information, or it can extend existing downlink F1 interface messages.

[0345] After receiving the third instruction information feedback from the UE sent by the source DU, S405b1 and CU send the sixth instruction information to the UE, indicating that the change and / or addition of the UE's current serving cell has been completed.

[0346] The sixth instruction information includes at least one of the following:

[0347] UE identification information;

[0348] The UE's current serving cell identifier;

[0349] Service cell change and / or addition completion indication;

[0350] Beam index;

[0351] Transmission Configuration Indicator (TCI) identifier;

[0352] UE context modification complete indication.

[0353] In this embodiment, the method of sending the sixth indication information includes at least one of the following:

[0354] Reuse downlink F1 interface messages;

[0355] Define a new downlink interface message.

[0356] S404b2. After receiving the third instruction information, the source DU stops downlink data transmission and sends the current downlink data transmission status information to the CU, indicating that some data has not been successfully transmitted and disconnects the current transmission channel.

[0357] After receiving the downlink data transmission status information, S405b2 and CU retransmit the data that was not successfully transmitted to the target DU.

[0358] Example 2:

[0359] like Figure 10 The method shown includes:

[0360] S501, CU receives the serving cell change and / or addition completion indication message sent by the UE through the air interface.

[0361] After receiving the serving cell change and / or addition completion indication message sent by the UE through the air interface, the CU establishes a connection with the target DU.

[0362] After receiving the serving cell change and / or addition completion indication, S502a, the CU transmits the first indication information to the target DU. This first indication information is used to notify the target DU that the current UE has undergone a serving cell change and / or addition.

[0363] The first instruction information includes at least one of the following:

[0364] UE identification information;

[0365] The UE's current serving cell identifier;

[0366] Service cell change and / or addition completion indication;

[0367] Beam index;

[0368] Transmission Configuration Indicator (TCI) identifier.

[0369] In this embodiment, the method of sending the first indication information includes at least one of the following:

[0370] Send messages via the newly defined interface;

[0371] Send messages via the F1 interface;

[0372] Messages are sent via the extended F1 interface.

[0373] In other words, a dedicated F1 interface message can be created to transmit the first indication information, or the existing downlink F1 interface message can be extended. For example, the IE can be added to carry the first indication information in the UE context modification request message. This message can be called an extended UE context modification request message. Alternatively, the existing downlink F1 interface message can be reused.

[0374] S503a: After receiving the first instruction information, the target DU activates the target cell.

[0375] S504a, The target DU sends feedback information of the first instruction information to the CU.

[0376] The feedback information of the first indication information is used to indicate that the UE context modification under the target DU is complete, that is, to indicate that the current serving cell change and / or addition process of the UE is complete (including: UE context modification status and current target cell activation status). The feedback information of the first indication information includes part or all of the content of the first indication information. The feedback information of the first indication information can reuse the original message, define a new message, or extend the original message. For example, it can reuse the existing uplink F1 interface message, such as the UE context modification response message, or it can create a new dedicated F1 interface message to transmit the feedback information of the first indication information, or it can extend the existing uplink F1 interface message.

[0377] After receiving the service cell change and / or addition completion indication, the S502b CU sends a third indication information to the source DU. The third indication information is used to indicate the modification or release of the UE context under the source DU and to request the deactivation or release of the source cell.

[0378] The third indication information may include part or all of the content of the first indication information. The third indication information may reuse existing messages, define new messages, or extend existing messages. For example, it may reuse existing downlink F1 interface messages, such as reusing the UE context modification or release request message, or it may create a new dedicated F1 interface message to transmit the third indication information, or it may extend existing downlink F1 interface messages.

[0379] S503b1 After receiving the third indication information and completing the UE context modification, the source DU sends feedback information of the third indication information to the CU, indicating that the modification and / or release of the UE context under the source DU is complete.

[0380] The third indication information feedback can reuse existing messages, define new messages, or extend existing messages. For example, it can reuse existing uplink F1 interface messages, such as reusing the UE context modification or release response message, or it can create a new dedicated F1 interface message to transmit the feedback information of the third indication information, or it can extend existing uplink F1 interface messages.

[0381] After receiving feedback of the third indication information from the source DU and / or the first indication information from the target DU, the S505 and CU send a sixth indication information to the UE, indicating that the change and / or addition of the UE's current serving cell has been completed.

[0382] The sixth instruction information includes at least one of the following:

[0383] UE identification information;

[0384] The UE's current serving cell identifier;

[0385] Service cell change and / or addition completion indication;

[0386] Beam index;

[0387] Transmission Configuration Indicator (TCI) identifier;

[0388] UE context modification complete indication.

[0389] In this embodiment, the method of sending the sixth indication information includes at least one of the following:

[0390] Reuse downlink F1 interface messages;

[0391] Define a new downlink interface message.

[0392] S504b2. After receiving the third instruction information, the source DU stops downlink data transmission and sends the current downlink data transmission status information to the CU, indicating that some data has not been successfully transmitted, and disconnects the current transmission channel.

[0393] After receiving the downlink data transmission status information, the S505b2 and CU retransmit the data that was not successfully transmitted to the target DU.

[0394] It should be noted that in the above embodiments, after the CU learns that the UE has completed the service cell change and / or addition, it needs to establish a new data transmission channel with the target cell of the target DU. The CU resends the data that was not successfully transmitted to the target DU according to the downlink data transmission status of the source DU, so as to ensure lossless data transmission.

[0395] For details, please refer to [link / reference]. Figures 11a to 11c .in, Figure 11a This shows that the UE's serving cell has changed from Cell A to Cell B; Figure 11b The diagram illustrates that after a UE's serving cell change, the UE sends an L1 / L2 handover success indication (the serving cell change and / or addition completion indication message mentioned above) to DU2 (the first DU or target DU mentioned above). DU2 then sends an L1 / L2 handover success message (the first indication information mentioned above) to CU. Upon learning that the UE has completed the serving cell change, CU establishes a new data transmission channel with the target cell under DU2.

[0396] Figure 11C shows that DU1 (the second DU or source DU mentioned above) sends downlink data transmission status to CU. Based on the downlink data transmission status sent by DU1, CU retransmits the data that was not successfully transmitted to DU2.

[0397] It should also be noted that in the above embodiments, after the CU learns that the UE has undergone a serving cell change and / or addition, it can also dynamically manage the candidate cells through the F1 interface, for example:

[0398] By introducing a new hold message, the current candidate cell can be kept unchanged, or, by default, the candidate cell remains unchanged if no message is received.

[0399] By releasing a message, a specific candidate cell can be released.

[0400] The non-serving cell is set as a candidate cell through the UE context establishment message.

[0401] Based on the same inventive concept, embodiments of this application provide an information transmission device, such as... Figure 12 As shown, the device 60 is applied to the first distribution unit DU and includes: a first receiving module 601 and a first transmitting module 602, wherein,

[0402] The first receiving module 601 is used to receive first indication information from the centralized unit CU; or...

[0403] The first sending module 602 is configured to send second indication information to the CU if it receives a serving cell change and / or addition completion indication message from the user equipment UE.

[0404] The first indication information and the second indication information are used to indicate that the UE has successfully completed the change and / or addition of serving cell.

[0405] In some embodiments, the device 60 may further include:

[0406] The first execution module (not shown in the figure) is used to activate the target cell of the UE according to the first indication information received from the central unit CU.

[0407] In other embodiments, the first sending module 601 is further configured to:

[0408] Feedback information is sent to the CU to indicate that the UE context modification under the first DU is complete.

[0409] In this embodiment, the feedback information of the first indication information includes some or all of the information in the first indication information, and the feedback information of the first indication information is sent in the same way as the first indication information.

[0410] In the above embodiments, the first indication information and the second indication information include at least one of the following:

[0411] UE identification information;

[0412] The UE's current serving cell identifier;

[0413] Service cell change and / or addition completion indication;

[0414] Beam index;

[0415] Transmission Configuration Indicator (TCI) identifier.

[0416] The methods for sending the first indication information and the second indication information include at least one of the following:

[0417] Send messages via the newly defined interface;

[0418] Send messages via the F1 interface;

[0419] Messages are sent via the extended F1 interface.

[0420] For details not described in the device provided in this application, please refer to [the relevant documentation]. Figure 2 and Figure 3 ,as well as Figures 9 to 11c The methods and apparatus provided in the embodiments shown in this application can achieve the same beneficial effects as 2 and 2. Figure 3 ,as well as Figures 9 to 11c The methods provided in the illustrated embodiments are the same and will not be repeated here.

[0421] Based on the same inventive concept, embodiments of this application provide an information transmission device, such as... Figure 13 As shown, the device 70 is applied to a centralized unit CU and includes: a second receiving module 701 and a second transmitting module 702, wherein,

[0422] The second receiving module 701 is used to receive second indication information from the first distribution unit DU; or...

[0423] The second sending module 702 is configured to send the first indication information to the first DU if it receives a serving cell change and / or addition completion indication message from the user equipment (UE).

[0424] The first indication information is used to indicate that the UE has successfully completed the change and / or addition of serving cell.

[0425] In some embodiments, a determining module (not shown) is further included, which is used to determine, based on the second indication information, that the UE's current serving cell has been switched to the target cell under the first DU.

[0426] In some embodiments, the second sending module 702 can also be used for:

[0427] Feedback information of the second indication information is sent to the first DU to indicate the modification of the UE context under the first DU;

[0428] Send a third indication message to the second DU, the third indication message being used to indicate the modification and / or release of the UE context under the second DU.

[0429] In other embodiments, if a serving cell change and / or addition completion indication message is received from a user equipment (UE), the second receiving module 701 is further configured to: receive feedback information of the first indication information sent by the first DU, for indicating that the UE context modification under the first DU is complete;

[0430] The second sending module 702 is further configured to: send third indication information to the second DU, the third indication information being used to indicate modification and / or release of the UE context under the second DU.

[0431] In other embodiments, the device 70 may further include:

[0432] The second execution module (not shown in the figure) is used to establish a new transmission channel with the first DU and disconnect the transmission channel with the second DU.

[0433] In other embodiments, the second sending module 702 can also be used for:

[0434] If downlink data transmission status information is received from the second DU, the downlink data that was not successfully transmitted is retransmitted to the first DU.

[0435] In other embodiments, the second sending module 702 may also be used to perform at least one of the following:

[0436] Send a fourth indication message to the third DU, the fourth indication message being used to indicate modification and / or release of the UE context under the third DU;

[0437] Send a fifth indication message to the fourth DU, the fifth indication message being used to indicate the establishment of a UE context under the fourth DU;

[0438] The second receiving module 701 can also be used for:

[0439] The system receives feedback information of the third indication information sent by the second DU and sends a sixth indication information to the UE. The feedback information of the third indication information is used to indicate that the modification and / or release of the UE context under the second DU is completed, and the sixth indication information is used to indicate that the current serving cell change and / or addition process of the UE is completed.

[0440] In this embodiment, the feedback information of the second indication information, the third indication information, the fourth indication information, the fifth indication information, the feedback information of the third indication information, and the sixth indication information all include some or all of the information in the second indication information;

[0441] The feedback information of the second indication information, the third indication information, the fourth indication information, the fifth indication information, the feedback information of the third indication information, and the sixth indication information are all sent using the same method as the second indication information.

[0442] In the above embodiments, the first indication information and the second indication information include at least one of the following:

[0443] UE identification information;

[0444] The UE's current serving cell identifier;

[0445] Service cell change and / or addition completion indication;

[0446] Beam index;

[0447] Transmission Configuration Indicator (TCI) identifier.

[0448] The methods for sending the first indication information and the second indication information include at least one of the following:

[0449] Send messages via the newly defined interface;

[0450] Send messages via the F1 interface;

[0451] Messages are sent via the extended F1 interface.

[0452] For details not described in the device provided in this application, please refer to [the relevant documentation]. Figures 4 to 6 ,as well as Figures 9 to 11c The methods and apparatus provided in the illustrated embodiments of this application can achieve the same beneficial effects as those described. Figures 4 to 6 ,as well as Figures 9 to 11c The methods provided in the illustrated embodiments are the same and will not be repeated here.

[0453] Based on the same inventive concept, embodiments of this application provide an information transmission device, such as... Figure 14 As shown, the device 80 is applied to the second distribution unit DU and includes: a first receiving module 801 and a third transmitting module 802, wherein,

[0454] The third receiving module 801 is used to receive third indication information from the central unit CU, the third indication information being used to indicate modification and / or release of the UE context under the second DU;

[0455] The third sending module 802 is used to stop transmitting downlink data and send downlink data transmission status information to the CU.

[0456] In some embodiments, the third sending module 802 can also be used for:

[0457] Feedback information of the third indication information is sent to the CU, the feedback information of the third indication information being used to indicate that the modification and / or release of the UE context under the second DU is complete.

[0458] In other embodiments, the feedback information of the third indication information is sent using the method for sending the third indication information, wherein the method for sending the third indication information includes at least one of the following:

[0459] Send messages via the newly defined interface;

[0460] Send messages via the F1 interface;

[0461] Messages are sent via the extended F1 interface.

[0462] In other embodiments, the third indication information includes at least one of the following:

[0463] UE identification information;

[0464] The UE's current serving cell identifier;

[0465] Service cell change and / or addition completion indication;

[0466] Beam index;

[0467] Transmission Configuration Indicator (TCI) identifier.

[0468] For details not described in the device provided in this application, please refer to [the relevant documentation]. Figures 7 to 11c The methods and apparatus provided in the illustrated embodiments of this application can achieve the same beneficial effects as those described. Figures 7 to 11c The methods provided in the illustrated embodiments are the same and will not be repeated here.

[0469] Based on the same principle as the method provided in the embodiments of this application, this application provides an electronic device, which includes: a memory and a processor; at least one program stored in the memory, which, when executed by the processor, compared with the prior art, after the UE receives an indication from the air interface that the serving cell change and / or addition is completed, it informs the network side by sending indication information. If the CU receives the indication information sent by the UE, it transmits the indication information to the DU; if the DU receives the indication information sent by the UE, it transmits the indication information to the CU, thereby solving the problem of how to transmit the successful indication of serving cell change and / or addition between the CU / DU interfaces after the UE successfully triggers the serving cell change and / or addition through L1 / L2 signaling.

[0470] An electronic device provided in this application embodiment can be the first distribution unit DU, the centralized unit CU, or the second DU in the above embodiments.

[0471] like Figure 15 As shown, this is a distribution unit provided in an embodiment of this application, which can specifically be the first DU mentioned above. Figure 15The distributed unit 90 shown includes a processor 903 and a memory 901. The processor 903 and the memory 901 are connected, for example, via a bus interface. Optionally, the base station device 90 may further include a transceiver 902, which can be used for data interaction between the base station device and other base station devices, such as sending and / or receiving data. It should be noted that in practical applications, the transceiver 902 is not limited to one unit, and the structure of the base station device 90 does not constitute a limitation on the embodiments of this application.

[0472] The processor 903 can perform the following operations:

[0473] Control transceiver 902 receives first indication information from the central unit CU; or,

[0474] If a serving cell change and / or addition completion indication message is received from a user equipment (UE), a second indication message is sent to the CU;

[0475] The first indication information and the second indication information are used to indicate that the UE has successfully completed the change and / or addition of serving cell.

[0476] In an optional embodiment, the processor 903 is further configured to: activate the target cell of the UE according to the first indication information.

[0477] In another alternative embodiment, the processor 903 is further configured to: control the transceiver 902 to send feedback information of the first indication information to the CU, for indicating that the UE context modification under the first DU is complete.

[0478] In this embodiment, the feedback information of the first indication information includes some or all of the information in the first indication information, and the feedback information of the first indication information is sent in the same way as the first indication information.

[0479] In the above embodiments, the first indication information and the second indication information include at least one of the following:

[0480] UE identification information;

[0481] The UE's current serving cell identifier;

[0482] Service cell change and / or addition completion indication;

[0483] Beam index;

[0484] Transmission Configuration Indicator (TCI) identifier.

[0485] The methods for sending the first indication information and the second indication information include at least one of the following:

[0486] Send messages via the newly defined interface;

[0487] Send messages via the F1 interface;

[0488] Messages are sent via the extended F1 interface.

[0489] It should be understood that in the above embodiments, Figure 15 The bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 903 and memory represented by memory 901 together. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. Transceiver 902 can be multiple elements, including transmitters and receivers, providing units for communicating with various other devices over transmission media, including wireless channels, wired channels, optical fibers, and other transmission media.

[0490] The processor 903 is responsible for managing the bus architecture and general processing, while the memory 902 can store the data used by the processor 903 when performing operations.

[0491] like Figure 16 As shown, this is a centralized unit provided in an embodiment of this application. Figure 16 The centralized unit 100 shown includes a processor 1003 and a memory 1001. The processor 1003 and the memory 1001 are connected, for example, via a bus interface. Optionally, the base station device 100 may further include a transceiver 1002, which can be used for data interaction between the base station device and other base station devices, such as sending and / or receiving data. It should be noted that in practical applications, the transceiver 1002 is not limited to one, and the structure of the base station device 100 does not constitute a limitation on the embodiments of this application.

[0492] The processor 1003 can perform the following operations:

[0493] Control transceiver 1002 receives second indication information from the first distribution unit DU; or,

[0494] If a serving cell change and / or addition completion indication message is received from a user equipment (UE), the first indication information is sent to the first DU.

[0495] The first indication information and the second indication information indicate that the UE has successfully completed the change and / or addition of serving cell.

[0496] In an optional embodiment, the processor 1003 is further configured to: determine, based on the second indication information, that the current serving cell of the UE has been switched to the target cell under the first DU.

[0497] In another alternative embodiment, the processor 1003 is further configured to:

[0498] The control transceiver 1002 sends feedback information of the second indication information to the first DU, which is used to indicate the modification of the UE context under the first DU;

[0499] Send a third indication message to the second DU, the third indication message being used to indicate the modification and / or release of the UE context under the second DU.

[0500] In another alternative embodiment, the processor 1003 is further configured to:

[0501] The control transceiver 1002 receives feedback information of the first indication information sent by the first DU, which is used to indicate that the UE context modification under the first DU is complete;

[0502] Send a third indication message to the second DU, the third indication message being used to indicate the modification and / or release of the UE context under the second DU.

[0503] In another alternative embodiment, the processor 1003 is further configured to: establish a new transmission channel with the first DU; and disconnect the transmission channel with the second DU.

[0504] In another optional embodiment, if the transceiver 1002 receives downlink data transmission status information from the second DU, the processor 1003 is further configured to: control the transceiver 1002 to retransmit the downlink data that was not successfully transmitted to the first DU.

[0505] In another alternative embodiment, the processor 1003 is further configured to: control the transceiver 1002 to perform at least one of the following operations:

[0506] Send a fourth indication message to the third DU, the fourth indication message being used to indicate modification and / or release of the UE context under the third DU;

[0507] Send a fifth indication message to the fourth DU, the fifth indication message being used to indicate the establishment of a UE context under the fourth DU;

[0508] The system receives feedback information of the third indication information sent by the second DU and sends a sixth indication information to the UE. The feedback information of the third indication information is used to indicate that the modification and / or release of the UE context under the second DU is completed, and the sixth indication information is used to indicate that the current serving cell change and / or addition process of the UE is completed.

[0509] In this embodiment, the feedback information of the second indication information, the third indication information, the fourth indication information, the fifth indication information, the feedback information of the third indication information, and the sixth indication information all include some or all of the information in the second indication information;

[0510] The feedback information of the second indication information, the third indication information, the fourth indication information, the fifth indication information, the feedback information of the third indication information, and the sixth indication information are all sent using the same method as the second indication information.

[0511] In the above embodiments, the first indication information and the second indication information include at least one of the following:

[0512] UE identification information;

[0513] The UE's current serving cell identifier;

[0514] Service cell change and / or addition completion indication;

[0515] Beam index;

[0516] Transmission Configuration Indicator (TCI) identifier.

[0517] The methods for sending the first indication information and the second indication information include at least one of the following:

[0518] Send messages via the newly defined interface;

[0519] Send messages via the F1 interface;

[0520] Messages are sent via the extended F1 interface.

[0521] It should be understood that in the above embodiments, Figure 16 The bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 1003 and memory represented by memory 1001 together. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 1002 can be multiple elements, including a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium, including wireless channels, wired channels, optical fibers, and other transmission media.

[0522] The processor 1003 is responsible for managing the bus architecture and general processing, while the memory 1002 can store the data used by the processor 1003 when performing operations.

[0523] like Figure 17 As shown, this is a distribution unit provided in an embodiment of this application, which can specifically be the first DU mentioned above. Figure 17 The distributed unit 110 shown includes a processor 1103 and a memory 1101. The processor 1103 and the memory 1101 are connected, for example, via a bus interface. Optionally, the base station device 110 may further include a transceiver 1102, which can be used for data interaction between the base station device and other base station devices, such as sending and / or receiving data. It should be noted that in practical applications, the transceiver 1102 is not limited to one, and the structure of the base station device 110 does not constitute a limitation on the embodiments of this application.

[0524] The processor 1103 can perform the following operations:

[0525] The control transceiver 1102 receives third indication information from the central unit CU, the third indication information being used to indicate modification and / or release of the UE context under the second DU;

[0526] Stop transmitting downlink data and send downlink data transmission status information to the CU.

[0527] In an optional embodiment, the processor 1103 is further configured to: control the transceiver 1102 to send feedback information of third indication information to the CU, the feedback information of third indication information being used to indicate that the modification and / or release of the UE context under the second DU is complete.

[0528] In the above embodiments, the feedback information of the third indication information is sent using the method for sending the third indication information, wherein the method for sending the third indication information includes at least one of the following:

[0529] Send messages via the newly defined interface;

[0530] Send messages via the F1 interface;

[0531] Messages are sent via the extended F1 interface.

[0532] The third indication information includes at least one of the following:

[0533] UE identification information;

[0534] The UE's current serving cell identifier;

[0535] Service cell change and / or addition completion indication;

[0536] Beam index;

[0537] Transmission Configuration Indicator (TCI) identifier.

[0538] It should be understood that in the above embodiments, Figure 17 The bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 1103 and memory represented by memory 1101 together. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 1102 can be multiple elements, including a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium, including wireless channels, wired channels, optical fibers, and other transmission media.

[0539] Processor 1103 is responsible for managing the bus architecture and general processing, while memory 1102 can store the data used by processor 1103 when performing operations.

[0540] This application provides a computer-readable storage medium storing a computer program. When the program is run on a computer, it enables the computer to execute the corresponding content in the aforementioned method embodiments. Compared with the prior art, after the UE receives an indication from the air interface that the serving cell change and / or addition is complete, it notifies the network side by sending an indication message. If the CU receives the indication message sent by the UE, it transmits the indication message to the DU; if the DU receives the indication message sent by the UE, it transmits the indication message to the CU. This solves the problem of how to transmit the successful serving cell change and / or addition indication between the CU / DU interfaces after the UE successfully triggers the serving cell change and / or addition via L1 / L2 signaling.

[0541] It should be noted that the division of units in the embodiments of this application is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0542] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0543] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0544] The above description is only a partial embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An information transmission method, characterized in that, Applied to the first distribution unit DU, the method includes: Receive first instruction information from the centralized unit CU; or, If a serving cell change and / or addition completion indication message is received from a user equipment (UE), a second indication message is sent to the CU; The first indication information and the second indication information are used to indicate that the UE has successfully completed the serving cell change and / or addition triggered by L1 / L2 signaling; The first indication information and the second indication information include at least one of the following: Beam index; Transmission Configuration Indicator (TCI) identifier.

2. The method according to claim 1, characterized in that, After receiving the first indication information from the central unit CU, the method further includes: The target cell of the UE is activated according to the first instruction information.

3. The method according to claim 2, characterized in that, The method further includes: Feedback information is sent to the CU to indicate that the UE context modification under the first DU is complete.

4. The method according to claim 3, characterized in that, The feedback information of the first instruction information includes some or all of the information in the first instruction information, and the feedback information of the first instruction information is sent in the same way as the first instruction information.

5. The method according to any one of claims 1-4, characterized in that, The first indication information and the second indication information further include at least one of the following: UE identification information; The UE's current serving cell identifier; Service cell change and / or addition completion indication.

6. The method according to any one of claims 1-4, characterized in that, The methods for sending the first indication information and the second indication information include at least one of the following: Send messages via the newly defined interface; Send messages via the F1 interface; Messages are sent via the extended F1 interface.

7. An information transmission method, characterized in that, Applied to a centralized unit (CU), the method includes: Receive second indication information from the first distribution unit (DU); or, If a serving cell change and / or addition completion indication message is received from a user equipment (UE), the first indication information is sent to the first DU. The first indication information and the second indication information are used to indicate that the UE has successfully completed the serving cell change and / or addition triggered by L1 / L2 signaling; The first indication information and the second indication information include at least one of the following: Beam index; Transmission Configuration Indicator (TCI) identifier.

8. The method according to claim 7, characterized in that, After receiving the second indication information from the first distribution unit (DU), the method further includes: Based on the second instruction information, it is determined that the UE's current serving cell has been changed to the target cell under the first DU.

9. The method according to claim 8, characterized in that, The method further includes: Feedback information of the second indication information is sent to the first DU to indicate the modification of the UE context under the first DU; Send a third indication message to the second DU, the third indication message being used to indicate the modification and / or release of the UE context under the second DU.

10. The method according to claim 7, characterized in that, If a serving cell change and / or addition completion indication message is received from a user equipment (UE), the method further includes: Feedback information received from the first indication information sent by the first DU is used to indicate that the UE context modification under the first DU is complete; Send a third indication message to the second DU, the third indication message being used to indicate the modification and / or release of the UE context under the second DU.

11. The method according to claim 9 or 10, characterized in that, The method further includes: Establish a new transmission channel with the first DU; Disconnect the transmission channel with the second DU.

12. The method according to claim 11, characterized in that, The method further includes: If downlink data transmission status information is received from the second DU, the downlink data that was not successfully transmitted is retransmitted to the first DU.

13. The method according to claim 9 or 10, characterized in that, The method further includes performing at least one of the following operations: Send a fourth indication message to the third DU, the fourth indication message being used to indicate modification and / or release of the UE context under the third DU; Send a fifth indication message to the fourth DU, the fifth indication message being used to indicate the establishment of a UE context under the fourth DU; The system receives feedback information of the third indication information sent by the second DU and sends a sixth indication information to the UE. The feedback information of the third indication information is used to indicate that the modification and / or release of the UE context under the second DU is completed, and the sixth indication information is used to indicate that the current serving cell change and / or addition process of the UE is completed.

14. The method according to claim 13, characterized in that, The feedback information of the second instruction information, the third instruction information, the fourth instruction information, the fifth instruction information, the feedback information of the third instruction information, and the sixth instruction information all include some or all of the information in the second instruction information; The feedback information of the second indication information, the third indication information, the fourth indication information, the fifth indication information, the feedback information of the third indication information, and the sixth indication information are all sent using the same method as the second indication information.

15. The method according to any one of claims 7-10, characterized in that, The first indication information and the second indication information further include at least one of the following: UE identification information; The UE's current serving cell identifier; Service cell change and / or addition completion indication.

16. The method according to any one of claims 7-10, characterized in that, The methods for sending the first indication information and the second indication information include at least one of the following: Send messages via the newly defined interface; Send messages via the F1 interface; Messages are sent via the extended F1 interface.

17. An information transmission method, characterized in that, The method, applied to the second distribution unit DU, includes: Receive third indication information from the central unit (CU), the third indication information being used to indicate modification and / or release of the UE context under the second DU; Stop transmitting downlink data and send downlink data transmission status information to the CU; The third indication information is sent by the CU after it learns that the UE has successfully completed the serving cell change and / or addition triggered by L1 / L2 signaling; The third indication information includes at least one of the following: Beam index; Transmission Configuration Indicator (TCI) identifier.

18. The method according to claim 17, characterized in that, The method further includes: Feedback information of the third indication information is sent to the CU, the feedback information of the third indication information is used to indicate that the modification and / or release of the UE context under the second DU is completed.

19. The method according to claim 18, characterized in that, The feedback information of the third indication information is sent using the method for sending the third indication information, wherein the method for sending the third indication information includes at least one of the following: Send messages via the newly defined interface; Send messages via the F1 interface; Messages are sent via the extended F1 interface.

20. The method according to any one of claims 17-19, characterized in that, The third instruction information also includes at least one of the following: UE identification information; The UE's current serving cell identifier; Service cell change and / or addition completion indication.

21. An information transmission device, characterized in that, Applied to the first distribution unit DU, including: The first receiving module is configured to receive first indication information from the centralized unit (CU); or... The first sending module is configured to send second indication information to the CU if it receives a serving cell change and / or addition completion indication message from the user equipment UE. The first indication information and the second indication information are used to indicate that the UE has successfully completed the serving cell change and / or addition triggered by L1 / L2 signaling; The first indication information and the second indication information include at least one of the following: Beam index; Transmission Configuration Indicator (TCI) identifier.

22. An information transmission device, characterized in that, Applied to lumped unit (CU), including: The second receiving module is used to receive second indication information from the first distribution unit (DU); or... The second sending module is configured to send first indication information to the first DU if it receives a serving cell change and / or addition completion indication message from the user equipment (UE). The first indication information and the second indication information are used to indicate that the UE has successfully completed the serving cell change and / or addition triggered by L1 / L2 signaling; The first indication information and the second indication information include at least one of the following: Beam index; Transmission Configuration Indicator (TCI) identifier.

23. An information transmission device, characterized in that, Applied to the second distribution unit DU, including: The third receiving module is used to receive third indication information from the central unit CU, the third indication information being used to indicate modification and / or release of the UE context under the second DU; The third sending module is used to stop transmitting downlink data and send downlink data transmission status information to the CU; The third indication information is sent by the CU after it learns that the UE has successfully completed the serving cell change and / or addition triggered by L1 / L2 signaling; The third indication information includes at least one of the following: Beam index; Transmission Configuration Indicator (TCI) identifier.

24. A first distribution unit DU, characterized in that, include: Memory, used to store computer programs; A transceiver is used to send and receive data under the control of a processor. Processor, configured to read the computer program in the memory and perform the following operations: The control transceiver receives the first indication information from the central unit (CU); or, If a serving cell change and / or addition completion indication message is received from a user equipment (UE), a second indication message is sent to the CU; The first indication information and the second indication information are used to indicate that the UE has successfully completed the serving cell change and / or addition triggered by L1 / L2 signaling; The first indication information and the second indication information include at least one of the following: Beam index; Transmission Configuration Indicator (TCI) identifier.

25. The first DU according to claim 24, characterized in that, The processor is further configured to: control the transceiver to send feedback information of the first indication information to the CU, for the completion of UE context modification under the first DU.

26. The first DU according to claim 24 or 25, characterized in that, The first indication information and the second indication information include at least one of the following: UE identification information; The UE's current serving cell identifier; Service cell change and / or addition completion indication; Beam index; Transmission Configuration Indicator (TCI) identifier.

27. The first DU according to claim 24 or 25, characterized in that, The methods for sending the first indication information and the second indication information include at least one of the following: Send messages via the newly defined interface; Send messages via the F1 interface; Messages are sent via the extended F1 interface.

28. A lumped unit CU, characterized in that, include: Memory, used to store computer programs; A transceiver is used to send and receive data under the control of a processor. Processor, configured to read the computer program in the memory and perform the following operations: The control transceiver receives second indication information from the first distribution unit (DU); or, If a serving cell change and / or addition completion indication message is received from a user equipment (UE), the first indication information is sent to the first DU. The first indication information and the second indication information indicate that the UE has successfully completed the serving cell change and / or addition triggered by L1 / L2 signaling; The first indication information and the second indication information include at least one of the following: Beam index; Transmission Configuration Indicator (TCI) identifier.

29. The CU according to claim 28, characterized in that, The processor is also used for: Feedback information from the control transceiver to the first DU, indicating the modification of the UE context under the first DU; and... Send a third indication message to the second DU, the third indication message being used to indicate the modification and / or release of the UE context under the second DU.

30. The CU according to claim 28, characterized in that, The processor is also used for: The control transceiver receives feedback information from the first indication information sent by the first DU, which is used to indicate that the UE context modification under the first DU is complete; Send a third indication message to the second DU, the third indication message being used to indicate the modification and / or release of the UE context under the second DU.

31. The CU according to claim 29 or 30, characterized in that, The processor is also configured to: establish a new transmission channel with the first DU; and disconnect the transmission channel with the second DU.

32. The CU according to claim 31, characterized in that, If the transceiver receives downlink data transmission status information from the second DU, the processor is further configured to: The transceiver is controlled to retransmit the downlink data that was not successfully transmitted to the first DU.

33. The CU according to claim 29 or 30, characterized in that, The processor is also configured to: control the transceiver to perform at least one of the following operations: Send a fourth indication message to the third DU, the fourth indication message being used to indicate modification and / or release of the UE context under the third DU; Send a fifth indication message to the fourth DU, the fifth indication message being used to indicate the establishment of a UE context under the fourth DU; The system receives feedback information of the third indication information sent by the second DU and sends a sixth indication information to the UE. The feedback information of the third indication information is used to indicate that the modification and / or release of the UE context under the second DU is completed, and the sixth indication information is used to indicate that the current serving cell change and / or addition process of the UE is completed.

34. A second distribution unit DU, characterized in that, include: Memory, used to store computer programs; A transceiver is used to send and receive data under the control of a processor. Processor, configured to read the computer program in the memory and perform the following operations: The control transceiver receives third indication information from the central unit (CU), the third indication information being used to indicate modification and / or release of the UE context under the second DU; Stop transmitting downlink data and send downlink data transmission status information to the CU; The third indication information is sent by the CU after it learns that the UE has successfully completed the serving cell change and / or addition triggered by L1 / L2 signaling; The third indication information includes at least one of the following: Beam index; Transmission Configuration Indicator (TCI) identifier.

35. The second DU according to claim 34, characterized in that, The processor is further configured to: control the transceiver to send feedback information of third indication information to the CU, the feedback information of third indication information being used to indicate that the modification and / or release of the UE context under the second DU is complete.

36. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program for causing a processor to perform the method of any one of claims 1-6, or any one of claims 7-16, or any one of claims 17-20.

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