CN117835356A

CN117835356A - Handover indication method, network element and storage medium

Info

Publication number: CN117835356A
Application number: CN202211195125.5A
Authority: CN
Inventors: 孙嘉颍; 张大钧; 张不方; 许萌
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2022-09-27
Filing date: 2022-09-27
Publication date: 2024-04-05

Abstract

The embodiment of the application provides a switching indication method, a network unit and a storage medium, wherein the method comprises the following steps: the CU receives first indication information sent by a source DU; the CU sends second indication information to a target DU based on the first indication information, wherein the second indication information is used for indicating a target cell and/or a target beam to be updated to the target DU by the terminal. The embodiment of the application can reduce the access time delay of the terminal.

Description

Handover indication method, network element and storage medium

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a handover indication method, a network element, and a storage medium.

Background

Centralized Unit (CU) and Distributed Unit (CU) communication mechanisms are supported in some communication systems, where a CU may correspond to one or more DUs. In the CU and DU communication mechanisms, terminal handover is mainly performed inside a DU (intra-DU), i.e. only beam is switched, and no change of serving cell is required. However, the concept of inter-DU (inter-DU) handover is introduced in some new researches, but how to reduce the access delay of the terminal under the inter-DU handover is a technical problem that needs to be solved urgently at present.

Disclosure of Invention

The embodiment of the application provides a switching indication method, a network unit and a storage medium, so as to solve the problem of how to reduce the access delay of a terminal.

The embodiment of the application provides a switching indication method, which comprises the following steps:

the CU receives first indication information sent by a source DU;

the CU sends second indication information to a target DU based on the first indication information, wherein the second indication information is used for indicating a target cell and/or a target beam to be updated to the target DU by the terminal.

Optionally, the first indication information includes at least one of:

the terminal identification of the terminal, the identification of the current service cell of the terminal and the information of the target cell.

Optionally, the second indication information includes at least one of:

the terminal identification of the terminal, the identification of the current service cell of the terminal, the information of the target cell and the update indication;

wherein the update indication comprises at least one of: a serving cell change indication and a serving cell addition indication.

Optionally, the information of the target cell includes at least one of:

a beam index of the target beam, a transmission configuration indication (transmission configuration indicator, TCI) identity of the target cell, an identity of the target cell;

Wherein the target beam belongs to the target cell.

Optionally, the method further comprises:

the CU executes target operation according to the first indication information, wherein the target operation comprises at least one of the following steps:

establishing a transmission channel between the target DU and the target DU;

disconnecting a transmission channel with the source DU;

and when the CU receives the downlink data transmission state of the terminal sent by the source DU and the downlink data transmission state indicates that the unsuccessfully transmitted downlink data exists, the CU retransmits the unsuccessfully transmitted downlink data.

Optionally, the CU receives first indication information sent by the source distribution unit DU, including:

the CU receives a first interface message sent by the source DU, wherein the first interface message carries the first indication information; or alternatively

The CU receives a second interface message sent by the source DU, wherein the second interface message carries the first indication information and other information, and the other information is information irrelevant to updating of a service cell.

Optionally, the method further comprises:

the CU sends configuration information of candidate cells to the source DU, and the target cell is a cell in the candidate cells.

Optionally, the configuration information includes at least one of:

terminal identification, candidate cell list, cell identification, physical cell identifier (Physical Cell Identity, PCT), cell global identifier (Cell Global Identifier, CGI), frequency point information, layer 1 channel state information Reference Signal (Channel State Information-Reference Signal, CSI-RS) information, synchronization Signal block (Synchronization Signal Block, SSB) information, layer 2 (Layer 2, L2) configuration information, layer 3 (Layer 3, L3) configuration information, TCI information, resource information reserved by physical Layer.

Optionally, the second indication information is further used for indicating: and activating the L3 configuration information of the target cell.

The embodiment of the application also provides a switching indication method, which comprises the following steps:

the DU determines that the terminal is about to perform a serving cell update;

the source DU transmits first indication information to the CU, the first indication information indicating that the terminal is to perform a serving cell update.

Optionally, the first indication information includes at least one of:

Optionally, the information of the target cell includes at least one of:

The beam index of the target beam, the transmission configuration indication TCI of the target cell and the identification of the target cell;

wherein the target beam belongs to the target cell.

Optionally, the method further comprises at least one of:

the source DU disconnects a transmission channel with the CU;

the source DU sends the downlink data transmission state of the terminal to the CU.

Optionally, the source DU sends first indication information to the CU, including:

the source DU sends a first interface message to the CU, wherein the first interface message carries the first indication information; or alternatively

The source DU sends a second interface message to the CU, wherein the second interface message carries the first indication information and other information, and the other information is information irrelevant to updating of a serving cell.

Optionally, the method further comprises:

the source DU receives configuration information of candidate cells sent by the CU, and the target cell is a cell in the candidate cells.

Optionally, the configuration information includes at least one of:

terminal identification, candidate cell list, cell identification, physical cell identifier PCT, cell global identifier CGI, frequency point information, layer 1 channel state information reference signal CSI-RS information, synchronous signal block SSB information, layer 2L2 configuration information, layer 3L3 configuration information, TCI information and resource information reserved by a physical layer.

the target distribution unit DU receives the second instruction information sent by the concentration unit CU;

the target DU performs a response operation based on the second indication information, the response operation including at least one of:

establishing a Radio Link Control (RLC) layer;

establishing a Media Access Control (MAC) layer;

physical layer information is applied.

Optionally, the second indication information includes at least one of:

Optionally, the information of the target cell includes at least one of:

wherein the target beam belongs to the target cell.

Optionally, the method further comprises:

the target DU establishes a transmission channel with the CU.

The embodiment of the application further provides a network element, where the network element is a central unit CU, and includes: memory, transceiver, and processor, wherein:

a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

receiving first indication information sent by a source distribution unit DU;

Optionally, the processor is further configured to:

executing target operation according to the first indication information, wherein the target operation comprises at least one of the following steps:

establishing a transmission channel between the target DU and the target DU;

disconnecting a transmission channel with the source DU;

The embodiment of the present application further provides a network unit, where the network unit is a source distribution unit DU, and includes: memory, transceiver, and processor, wherein:

determining that the terminal is about to execute service cell update;

and sending first indication information to the centralized unit CU, wherein the first indication information is used for indicating that the terminal is about to execute the service cell update.

Optionally, the unit further comprises at least one of:

the source DU disconnects a transmission channel with the CU;

The embodiment of the present application further provides a network unit, where the network unit is a target distribution unit DU, and includes: memory, transceiver, and processor, wherein:

Receiving second indication information sent by a centralized unit CU;

based on the second indication information, performing a response operation, the response operation including at least one of:

establishing a Radio Link Control (RLC) layer;

establishing a Media Access Control (MAC) layer;

physical layer information is applied.

Optionally, the processor is further configured to:

and establishing a transmission channel with the CU.

Optionally, the processor is further configured to:

and establishing a transmission channel with the CU.

The embodiment of the application also provides a CU, which comprises:

a receiving unit for receiving the first indication information transmitted by the source distribution unit DU;

and the first sending unit is used for sending second indicating information to a target DU based on the first indicating information, wherein the second indicating information is used for indicating a target cell and/or a target beam to be updated to the target DU by the terminal.

The embodiment of the present application further provides a distribution unit DU, where the DU is a source DU, and includes:

a determining unit configured to determine that a terminal is about to perform a serving cell update;

a first sending unit, configured to send first indication information to the concentration unit CU, where the first indication information is used to indicate that the terminal is about to perform a serving cell update.

The embodiment of the present application further provides a distribution unit DU, where the DU is a target DU, and includes:

a receiving unit, configured to receive the second instruction information sent by the centralizing unit CU;

an execution unit configured to execute a response operation based on the second instruction information, the response operation including at least one of:

establishing a Radio Link Control (RLC) layer;

establishing a Media Access Control (MAC) layer;

physical layer information is applied.

The embodiment of the application also provides a processor-readable storage medium, which stores a computer program, wherein the computer program is used for enabling the processor to execute the CU-side handover instruction method, or is used for enabling the processor to execute the source DU-side handover instruction method, or is used for enabling the processor to execute the target DU-side handover instruction method.

In the embodiment of the application, the CU receives first indication information sent by the DU; the CU sends second indication information to a target DU based on the first indication information, wherein the second indication information is used for indicating a target cell and/or a target beam to be updated to the target DU by the terminal. In this way, when the terminal is about to perform the service cell update, the second indication information is sent to the target DU so as to indicate to the target DU that the terminal is about to update to the target cell and/or the target beam of the target DU, thereby realizing that the target DU can be prepared in advance before the terminal is accessed, so as to reduce the access delay of the terminal.

Drawings

FIG. 1 is a schematic diagram of a network architecture applicable to the implementation of the present application;

fig. 2 is a flowchart of a handover indication method provided in an embodiment of the present application;

fig. 3 is a flowchart of another handover indication method provided in an embodiment of the present application;

fig. 4 is a flowchart of another handover indication method provided in an embodiment of the present application;

fig. 5 is a block diagram of a network element according to an embodiment of the present application;

fig. 6 is a block diagram of another network element according to an embodiment of the present application;

fig. 7 is a block diagram of another network element according to an embodiment of the present application;

fig. 8 is a block diagram of another network element according to an embodiment of the present application;

fig. 9 is a block diagram of another network element according to an embodiment of the present application;

fig. 10 is a block diagram of another network element according to an embodiment of the present application.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the present application more apparent, the following detailed description will be given with reference to the accompanying drawings and the specific embodiments.

In the embodiment of the application, the term "and/or" describes the association relationship of the association objects, which means that three relationships may exist, for example, a and/or B may be represented: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

The term "plurality" in the embodiments of the present application means two or more, and other adjectives are similar thereto.

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The method and the device are based on the same application, and because the principles of solving the problems by the method and the device are similar, the implementation of the device and the method can be referred to each other, and the repetition is not repeated.

The technical scheme provided by the embodiment of the application can be suitable for various systems, in particular to a 6G system. For example, applicable systems may be global system for mobile communications (global system of mobile communication, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) universal packet Radio service (general packet Radio service, GPRS), long term evolution (long term evolution, LTE), LTE frequency division duplex (frequency division duplex, FDD), LTE time division duplex (time division duplex, TDD), long term evolution-advanced (long term evolution advanced, LTE-a), universal mobile system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX), 5G New air interface (New Radio, NR), 6G, and the like. Terminal devices and network devices are included in these various systems. Core network parts such as evolved packet system (Evloved Packet System, EPS), 5G system (5 GS) etc. may also be included in the system.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a network architecture applicable to the implementation of the present application, as shown in fig. 1, including a terminal 11 and a network device 12, where:

the terminal 11 according to the embodiments of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing device connected to a wireless modem, etc. The names of the terminal devices may also be different in different systems, for example in a 5G system, the terminal devices may be referred to as User Equipment (UE). The wireless terminal device may communicate with one or more Core Networks (CNs) via a radio access Network (Radio Access Network, RAN), which may be mobile terminal devices such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, e.g., portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange voice and/or data with the radio access Network. Such as personal communication services (Personal Communication Service, PCS) phones, cordless phones, session initiation protocol (Session Initiated Protocol, SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal Digital Assistant, PDAs), redcap terminals, and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile), remote station (remote station), access point (access point), remote terminal device (remote terminal), access terminal device (access terminal), user terminal device (user terminal), user agent (user agent), user equipment (user device), and the embodiments of the present application are not limited.

The network device 12 according to the embodiments of the present application may be a base station, which may include a plurality of cells for providing services to terminals. A base station may also be called an access point or may be a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or other names, depending on the particular application. The network device may be operable to exchange received air frames with internet protocol (Internet Protocol, IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in a global system for mobile communications (Global System for Mobile communications, GSM) or code division multiple access (Code Division Multiple Access, CDMA), a network device (NodeB) in a wideband code division multiple access (Wide-band Code Division Multiple Access, WCDMA), an evolved network device (evolutional Node B, eNB or e-NodeB) in a long term evolution (long term evolution, LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), a base station in 6G, a home evolved base station (Home evolved Node B, heNB), a relay node (relay node), a home base station (femto), a pico base station (pico), and the like, which are not limited in the embodiments of the present application. In some network structures, the network device may include a Centralized Unit (CU) and a Distributed Unit (DU), which may also be geographically separated.

In this embodiment, the target DU and the source DU belong to different DUs under the same CU.

In this embodiment, multiple-input Multiple-output (Multi Input Multi Output, MIMO) transmission may be performed between the network side and the terminal by using one or more antennas, and the MIMO transmission may be Single-User MIMO (SU-MIMO) or Multiple-User MIMO (MU-MIMO). The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or may be diversity transmission, precoding transmission, beamforming transmission, or the like, depending on the form and number of the root antenna combinations.

Referring to fig. 2, fig. 2 is a flowchart of a handover indication method according to an embodiment of the present application, as shown in fig. 2, including the following steps:

step 201, a CU receives first indication information sent by a source DU;

step 202, the CU sends second indication information to a target DU based on the first indication information, where the second indication information is used to indicate a target cell and/or a target beam to be updated to the target DU by the terminal.

The first indication information may be sent by the source DU to the CU when the source DU determines that the terminal is about to perform the serving cell update. For example: after the source DU determines that the terminal wants to change and/or add a serving cell, it sends first indication information to the CU, to indicate to the CU that the terminal is about to perform a serving cell update, e.g., a serving cell change and/or addition, e.g., a change or addition to a target cell, or a change or addition to a target beam.

As an optional embodiment, the first indication information is used to indicate that the terminal is about to perform a serving cell update.

The terminal may be about to perform the serving cell update, or the terminal may be about to perform the serving cell update. And the terminal may be determined by the network device or may be determined by the terminal.

The target DU includes the target cell and the target beam.

The updating of the target cell and/or the target beam to the target DU may include:

updating a target cell to the target DU;

updating the target beam to the target DU;

the target beam in the target cell to the target DU is updated.

The target beam updated to the target cell of the target DU may be determined by determining the target beam first, and then determining the target cell according to the target beam, or determining the target cell first, and then determining the target beam according to the target cell.

In the embodiment of the application, when the terminal is about to execute the updating of the service cell, the second indication information is sent to the target DU so as to indicate to the target DU that the terminal is about to update the target cell and/or the target beam of the target DU, thereby realizing that the target DU can be prepared in advance before the terminal is accessed so as to reduce the access delay of the terminal.

In some embodiments, the target DU, after learning the target cell and/or target beam information, can perform radio link control (Radio Link Control, RLC) and/or medium access control (Medium Access Control, MAC) layer re-establishment prior to terminal access to reduce access latency of the terminal.

In some embodiments, after knowing the target cell and/or the target beam information, the target DU can detect the terminal in a targeted manner, so as to avoid blind detection and reduce the access delay of the terminal.

In some embodiments, after knowing the target cell and/or target beam information, the target DU activates the L3 configuration information of the target cell and/or target beam before the terminal accesses, so as to reduce the access delay of the terminal.

In some embodiments, the CU and the target DU may activate configuration of the application target cell before the terminal accesses according to the second indication information and perform terminal detection in a targeted manner according to the information of the target beam, so as to reduce the access delay of the terminal.

In some embodiments, after determining the target cell and/or the target beam information, the CU may activate the configuration of the target cell for the terminal in advance before the terminal accesses, perform a recovery (recovery) process of a packet data convergence protocol (Packet Data Convergence Protocol, PDCP) layer, and after knowing the target cell and/or the target beam information, perform the reconstruction of the RLC and/or the MAC layer before the terminal accesses, and specifically detect the terminal, so as to avoid blind detection, and reduce the access delay of the terminal.

As an alternative embodiment, the serving cell update includes at least one of:

serving cell change and serving cell addition.

The serving cell change may be to change the current serving cell to another serving cell.

In some embodiments, the serving cell change includes at least one of:

primary Cell (PCell) change, primary Secondary Cell (Primary Secondary Cell, PSCell) change, secondary Cell (SCell) change, cell handover, beam handover.

The serving cell adding may be adding other serving cells based on the current serving cell.

In some embodiments, the serving cell addition includes: PSCell addition, SCell addition.

As an optional embodiment, the first indication information includes at least one of:

Wherein the information of the target cell may include at least one of:

a beam index of the target beam, a TCI (traffic control interface) identifier of the target cell and an identifier of the target cell; wherein the target beam belongs to the target cell.

In this embodiment, the terminal identifier of the terminal, the identifier of the current serving cell of the terminal, and the information of the target cell may be that the CU directly determines the target cell and the target beam, so as to improve the processing efficiency.

It should be noted that, in some embodiments, the first indication information may also be an identifier that does not include the terminal, for example: the identity of the terminal can not be transferred between the source DU, the CU and the target DU, and the target DU knows that the terminal needs to be accessed after receiving the second indication information, so that resources can be reserved or related configuration can be activated, and the access delay of the terminal can be reduced.

In addition, in some embodiments, the first indication information may not include the identifier of the current serving cell and the information of the target cell, for example, the CU decides on the target cell and/or the target beam.

As an optional embodiment, the second indication information includes at least one of:

The information of the target cell may include at least one of the following:

the beam index of the target beam, the TCI identification of the target cell and the identification of the target cell.

The update indication may be a serving cell handover and/or addition indication.

In this embodiment, the terminal identifier of the terminal, the identifier of the current serving cell of the terminal, the information of the target cell, and the update instruction may be that the DU directly determines the target cell and the target beam, so as to improve the processing efficiency.

In some embodiments, the second indication information may be an identifier that does not include the terminal, for example: after receiving the second indication information, the target DU knows that the terminal needs to be accessed, so that resources can be reserved or related configuration is activated, and the access time delay of the terminal can be reduced.

In addition, in some embodiments, the first indication information may not include the identifier of the current serving cell and the information of the target cell, for example: after receiving the second indication information, the target DU knows that the terminal needs to be accessed, so that resources can be reserved or related configuration of a plurality of cells can be activated, and the access delay of the terminal can be reduced.

In addition, in some embodiments, the first indication information may not include an update indication, for example: the target DU defaults to the second indication information described above to implicitly indicate a serving cell update.

As an alternative embodiment, the method further comprises:

establishing a transmission channel between the target DU and the target DU;

disconnecting a transmission channel with the source DU;

In this embodiment, the above establishment of the transmission channel with the target DU may be implemented, so that the transmission channel between the CU and the target DU is established in advance, thereby improving data transmission efficiency.

In this embodiment, the resources of the CU may be saved by disconnecting the transmission channel with the source DU.

In this embodiment, the CU retransmits the unsuccessfully transmitted downlink data, so as to reduce data transmission failure and improve data transmission performance.

As an optional implementation manner, the CU receives the first indication information sent by the source distribution unit DU, including:

The first interface message may be understood as an interface message newly defined in the embodiment of the present application, where the interface message is used for notifying the CU of the source DU, the terminal is about to occur or the serving cell update occurs, and the message is a terminal related message, for example, the first interface message is an interface message used for notifying the serving cell update.

In this embodiment, the first indication information may be flexibly sent through the first interface message.

The second interface message may send the first indication information by multiplexing a defined interface message, and specifically may display or implicitly add the first indication information in the message.

The other information may be other information that the second interface message uses for requesting, for example: the terminal context modification request (UE context modification request), i.e. the second interface message may be a UE context modification request message, for example: the second interface message is UE context modification request message in the F1 interface message.

In this embodiment, the transmission overhead may be reduced through the second interface message.

In one embodiment, the method comprises the steps of:

step 0: the source DU decides to perform a serving cell change and/or addition according to the measurement report transmitted by the terminal.

Step 1: the source DU sends the first indication information to the CU through the F1 interface message, and the F1 interface message may be extended UE CONTEXT MODIFICATION REQUIRED, carrying the first indication information.

The first indication information carries one or more of the following information:

a terminal identifier;

a service cell identification;

serving cell handover and/or addition indication;

beam index of the target cell;

TCI identification of the target cell;

and (5) target cell identification.

Step 2a: after receiving the message, the CU establishes a new data transmission channel with the target cell of the target DU according to the first indication information, and the CU resends the data which are successfully transmitted to the target DU according to the downlink data transmission state of the source DU, so that the lossless transmission of the data is ensured, and the data transmission channel between the CU and the source DU is disconnected.

Step 2b: after receiving the message, the CU sends the second indication information through the F1 interface message, and the F1 interface message may extend UE CONTEXT MODIFICATION REQUEST the message, and carry the second indication information. The second indication information carries one or more of the following information:

A UE identity;

a service cell identification;

serving cell handover and/or addition indication;

beam index of the target cell;

TCI identification of the target cell;

and (5) target cell identification.

Step 3: after receiving the second instruction information, the target DU analyzes the second instruction information and specifically detects the terminal according to the content of the second instruction information.

As an alternative embodiment, the method further comprises:

Wherein the configuration information includes at least one of:

terminal identification, candidate cell list, cell identification, PCT, CGI, frequency point information, layer 1CSI-RS information, synchronous signal block SSB information, L2 configuration information, L3 configuration information, TCI information and resource information reserved by a physical layer.

The terminal identifier may indicate that the configuration information is applied to a terminal corresponding to the terminal identifier, and the terminal identifier may be an identifier of one or more terminals or a terminal group. In some embodiments, the identifier of the terminal may not be included, and the configuration information is general configuration information.

In addition, the configuration information may be sent through an F1 interface message, and a defined F1 interface message, for example, a UE context modification request message, may be extended to carry the configuration information.

In this embodiment, it may be achieved that the configuration information of the candidate cell learned by the source DU is configured by the CU to the source DU. For example: after obtaining the configuration of the candidate cell from the candidate DU, the CU sends the configuration information of the candidate cell to the source DU through the F1 interface message.

In one embodiment, the CU transmits configuration information of a candidate cell (candidate cell) to a source DU, comprising the steps of:

step 1: after receiving the configuration information of the candidate cell sent by the candidate DU, the CU sends the configuration information to the source DU through an F1 interface message. The F1 interface message may extend a defined F1 interface message, for example, UE context modification request message, where the configuration information of the Candidate cell carried by the F1 interface message includes one or more of the following:

a) Information such as UE identification;

a candidate cell list (Candidate cell list);

cell identification (cell ID) for Candida cells

PCI information for Candida cells;

CGI information for Candidate cells;

frequency point information for Candidate cells;

l1 CSI-RS related information for Candida cells;

SSB information for Candidate cells;

l2 configuration information for Candida cells;

l3 configuration information for Candidate cells;

TCI information for Candidate cells;

resource information reserved for the physical layer of Candidate cells;

step 2: after receiving the candidate cell configuration, the source DU analyzes the configuration and stores relevant information for subsequent transmission of first indication information to the CU.

As an optional implementation manner, the second indication information is further used for indicating: and activating the L3 configuration information of the target cell.

In some embodiments, after receiving the first indication information, the CU may activate L3 configuration of the corresponding target cell and send the second indication information to the target DU.

In the above embodiment, since the second indication information is further used for indicating the L3 configuration information of the activation target cell, it is possible to activate the L3 configuration information of the target cell in advance before the terminal accesses the target cell, so as to reduce the access delay of the terminal.

For example: the service cell update decision information (namely the first indication information and the second indication information) is transmitted among the source DU, the CU and the target DU through the F1 interface, the CU and the target DU can activate the configuration of the application target cell and carry out targeted terminal detection before the terminal is accessed according to the decision information (namely the second indication information), and lower switching delay is ensured.

Referring to fig. 3, fig. 3 is a flowchart of another handover indication method according to an embodiment of the present application, as shown in fig. 3, including the following steps:

step 301, a source DU determines that a terminal is about to execute a serving cell update;

step 302, the source DU sends first indication information to the concentration unit CU, said first indication information being used to indicate that the terminal is about to perform a serving cell update.

Optionally, the serving cell update includes at least one of:

serving cell change and serving cell addition.

Optionally, the serving cell change includes at least one of:

primary cell PCell change, primary secondary cell PSCell change, secondary cell SCell change, cell handover, beam handover;

the serving cell addition includes at least one of: PSCell addition, SCell addition.

Optionally, the first indication information includes at least one of:

Optionally, the information of the target cell includes at least one of:

wherein the target beam belongs to the target cell.

Optionally, the method further comprises at least one of:

the source DU disconnects a transmission channel with the CU;

Optionally, the method further comprises:

Optionally, the configuration information includes at least one of:

It should be noted that, as an implementation manner of the source DU corresponding to the embodiment shown in fig. 2, a specific implementation manner of the source DU may refer to a related description of the embodiment shown in fig. 2, so that in order to avoid repeated description, the embodiment is not described again, and the same beneficial effects may be achieved.

Referring to fig. 4, fig. 4 is a flowchart of another handover indication method according to an embodiment of the present application, as shown in fig. 4, including the following steps:

step 401, receiving second instruction information sent by a CU by a target DU;

step 402, the target DU performs a response operation based on the second instruction information, where the response operation includes at least one of the following:

establishing a Radio Link Control (RLC) layer;

establishing a Media Access Control (MAC) layer;

physical layer information is applied.

Optionally, the updating the target cell and/or the target beam to the target DU includes at least one of:

Changing to the target cell or changing to the target beam;

and adding the target cell and/or the target beam.

Optionally, the target cell includes at least one of:

a primary cell PCell, a primary secondary cell PSCell, and a secondary cell SCell.

Optionally, the second indication information includes at least one of:

Optionally, the information of the target cell includes at least one of:

wherein the target beam belongs to the target cell.

Optionally, the method further comprises:

the target DU establishes a transmission channel with the CU.

It should be noted that, as an implementation manner of the target DU corresponding to the embodiment shown in fig. 2, a specific implementation manner of the target DU may refer to a related description of the embodiment shown in fig. 2, so that in order to avoid repeated description, the embodiment is not described again, and the same beneficial effects may be achieved.

Referring to fig. 5, fig. 5 is a block diagram of a network unit provided in an embodiment of the present application, where the network unit is a CU, and as shown in fig. 5, includes a memory 520, a transceiver 500, and a processor 510:

a memory 520 for storing a computer program; a transceiver 500 for transceiving data under the control of the processor 510; a processor 510 for reading the computer program in the memory 520 and performing the following operations:

receiving first indication information sent by a source DU;

and based on the first indication information, sending second indication information to a target DU, wherein the second indication information is used for indicating a target cell and/or a target beam to be updated to the target DU by the terminal.

Where in FIG. 5, a bus architecture may comprise any number of interconnected buses and bridges, with various circuits of the one or more processors, as represented by processor 510, and the memory, as represented by memory 520, being linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 500 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over transmission media, including wireless channels, wired channels, optical cables, etc. The user interface 530 may also be an interface capable of interfacing with an inscribed desired device for a different user device, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 510 is responsible for managing the bus architecture and general processing, and the memory 520 may store data used by the processor 510 in performing operations.

Alternatively, the processor 510 may be a CPU (Central processing Unit), ASIC (Application Specific Integrated Circuit ), FPGA (Field-Programmable Gate Array, field programmable Gate array) or CPLD (Complex Programmable Logic Device ), and the processor may also employ a multicore architecture.

The processor is configured to execute any of the methods provided in the embodiments of the present application by invoking a computer program stored in a memory in accordance with the obtained executable instructions. The processor and the memory may also be physically separate.

Optionally, the serving cell update includes at least one of:

serving cell change and serving cell addition.

Optionally, the serving cell change includes at least one of:

Optionally, the first indication information includes at least one of:

Optionally, the second indication information includes at least one of:

Optionally, the information of the target cell includes at least one of:

wherein the target beam belongs to the target cell.

Optionally, the method further comprises:

establishing a transmission channel between the target DU and the target DU;

disconnecting a transmission channel with the source DU;

Optionally, the first indication information sent by the receiving source distribution unit DU includes:

receiving a first interface message sent by the source DU, wherein the first interface message carries the first indication information; or alternatively

And receiving a second interface message sent by the source DU, wherein the second interface message carries the first indication information and other information, and the other information is information irrelevant to updating of a service cell.

Optionally, the processor 510 is further configured to:

and sending configuration information of a candidate cell to the source DU, wherein the target cell is a cell in the candidate cell.

Optionally, the configuration information includes at least one of:

It should be noted that, the CU provided in the embodiment of the present application can implement all the method steps implemented in the method embodiment and achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those in the method embodiment in the embodiment are omitted.

Referring to fig. 6, fig. 6 is a block diagram of a network unit provided in an embodiment of the present application, where the network unit is a source DU, as shown in fig. 6, including a memory 620, a transceiver 600, and a processor 610:

a memory 620 for storing a computer program; a transceiver 600 for transceiving data under the control of the processor 610; a processor 610 for reading the computer program in the memory 620 and performing the following operations:

determining that the terminal is about to execute service cell update;

and sending first indication information to the CU, wherein the first indication information is used for indicating that the terminal is about to execute the service cell update.

Wherein in fig. 6, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 610 and various circuits of memory represented by memory 620, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 600 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over transmission media, including wireless channels, wired channels, optical cables, etc. The user interface 630 may also be an interface capable of interfacing with an inscribed desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 610 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 610 in performing operations.

Alternatively, the processor 610 may be a CPU (Central processing Unit), ASIC (Application Specific Integrated Circuit ), FPGA (Field-Programmable Gate Array, field programmable Gate array) or CPLD (Complex Programmable Logic Device ), and the processor may also employ a multicore architecture.

Optionally, the serving cell update includes at least one of:

serving cell change and serving cell addition.

Optionally, the serving cell change includes at least one of:

the serving cell addition includes: PSCell addition, SCell addition.

Optionally, the first indication information includes at least one of:

Optionally, the information of the target cell includes at least one of:

wherein the target beam belongs to the target cell.

Optionally, the method further comprises at least one of:

the source DU disconnects a transmission channel with the CU;

Optionally, the sending the first indication information to the CU includes:

sending a first interface message to the CU, wherein the first interface message carries the first indication information; or alternatively

And sending a second interface message to the CU, wherein the second interface message carries the first indication information and other information, and the other information is information irrelevant to updating of the serving cell.

Optionally, the processor 610 is further configured to:

and receiving configuration information of candidate cells sent by the CU, wherein the target cell is a cell in the candidate cells.

Optionally, the configuration information includes at least one of:

It should be noted that, the source DU provided in the embodiment of the present application can implement all the method steps implemented in the method embodiment and achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those in the method embodiment in the embodiment are omitted herein.

Referring to fig. 7, fig. 7 is a block diagram of a network unit according to an embodiment of the present application, where the network unit is a target DU, as shown in fig. 7, including a memory 720, a transceiver 700, and a processor 710:

a memory 720 for storing a computer program; a transceiver 700 for transceiving data under the control of the processor 710; a processor 710 for reading the computer program in the memory 720 and performing the following operations:

receiving second indication information sent by a centralized unit CU;

Establishing a Radio Link Control (RLC) layer;

establishing a Media Access Control (MAC) layer;

physical layer information is applied.

Wherein in fig. 7, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 710 and various circuits of memory represented by memory 720, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 700 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over transmission media, including transmission media including wireless channels, wired channels, optical cables, and the like. The user interface 730 may also be an interface capable of interfacing with an inscribed desired device for a different user device, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 710 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 710 in performing operations.

Alternatively, the processor 710 may be a CPU (Central processing Unit), ASIC (Application Specific Integrated Circuit ), FPGA (Field-Programmable Gate Array, field programmable Gate array) or CPLD (Complex Programmable Logic Device ), and the processor may also employ a multicore architecture.

Optionally, the processor 710 is further configured to:

establishing a Radio Link Control (RLC) layer;

establishing a Media Access Control (MAC) layer;

physical layer information is applied.

changing to the target cell or changing to the target beam;

and adding the target cell and/or the target beam.

Optionally, the target cell includes at least one of:

Optionally, the second indication information includes at least one of:

Optionally, the information of the target cell includes at least one of:

wherein the target beam belongs to the target cell.

Optionally, the processor 710 is further configured to:

and establishing a transmission channel with the CU.

It should be noted that, the network element provided in the embodiment of the present application can implement all the method steps implemented in the embodiment of the method and achieve the same technical effects, and the same parts and beneficial effects as those of the embodiment of the method in the embodiment are not described in detail herein.

Referring to fig. 8, fig. 8 is a block diagram of another network element provided in the embodiment of the present application, where the network element is a CU, as shown in fig. 8, and a network element 800 includes:

A receiving unit 801, configured to receive first indication information sent by the source distribution unit DU;

a first transmitting unit 802, configured to transmit, to a target DU, second indicating information based on the first indicating information, where the second indicating information is used to indicate a target cell and/or a target beam to be updated to the target DU by the terminal.

Optionally, the serving cell update includes at least one of:

serving cell change and serving cell addition.

Optionally, the serving cell change includes at least one of:

Optionally, the first indication information includes at least one of:

Optionally, the second indication information includes at least one of:

Optionally, the information of the target cell includes at least one of:

wherein the target beam belongs to the target cell.

Optionally, the network element further includes:

the execution unit is used for executing target operation according to the first indication information, and the target operation comprises at least one of the following steps:

establishing a transmission channel between the target DU and the target DU;

disconnecting a transmission channel with the source DU;

Optionally, the receiving unit 801 is configured to:

Optionally, the network element further includes:

and a second sending unit, configured to send configuration information of a candidate cell to the source DU, where the target cell is a cell in the candidate cell.

Optionally, the configuration information includes at least one of:

Referring to fig. 9, fig. 9 is a block diagram of another network unit provided in the embodiment of the present application, where the network unit is a source DU, as shown in fig. 9, and the network unit 900 includes:

A determining unit 901, configured to determine that a terminal is about to perform a serving cell update;

a first sending unit 902, configured to send first indication information to the concentration unit CU, where the first indication information is used to indicate that the terminal is about to perform a serving cell update.

Optionally, the serving cell update includes at least one of:

serving cell change and serving cell addition.

Optionally, the serving cell change includes at least one of:

the serving cell addition includes: PSCell addition, SCell addition.

Optionally, the first indication information includes at least one of:

Optionally, the information of the target cell includes at least one of:

wherein the target beam belongs to the target cell.

Optionally, the network element further comprises at least one of:

The disconnecting unit is used for disconnecting the transmission channel with the CU;

and the second sending unit is used for sending the downlink data transmission state of the terminal to the CU.

Optionally, the first sending unit 902 is configured to:

Optionally, the network element further includes:

and the receiving unit is used for receiving the configuration information of the candidate cells sent by the CU, and the target cell is a cell in the candidate cells.

Optionally, the configuration information includes at least one of:

Referring to fig. 10, fig. 10 is a block diagram of another network unit provided in the embodiment of the present application, where the network unit is a target DU, as shown in fig. 10, a network unit 1000 includes:

a receiving unit 1001, configured to receive the second instruction information sent by the centralizing unit CU;

an execution unit 1002, configured to execute a response operation based on the second instruction information, where the response operation includes at least one of:

establishing a Radio Link Control (RLC) layer;

establishing a Media Access Control (MAC) layer;

physical layer information is applied.

changing to the target cell or changing to the target beam;

and adding the target cell and/or the target beam.

Optionally, the target cell includes at least one of:

Optionally, the second indication information includes at least one of:

Optionally, the information of the target cell includes at least one of:

wherein the target beam belongs to the target cell.

Optionally, the network element further includes:

and the establishing unit is used for establishing a transmission channel with the CU.

It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice. In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a processor-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution, in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The processor-readable storage medium may be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic storage (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), semiconductor storage (e.g., ROM, EPROM, EEPROM, nonvolatile storage (NAND FLASH), solid State Disk (SSD)), and the like.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

1. A handover indication method, comprising:

the method comprises the steps that a centralized unit CU receives first indication information sent by a source distribution unit DU;

2. The method of claim 1, wherein the first indication information comprises at least one of:

3. The method of claim 1, wherein the second indication information comprises at least one of:

4. A method according to claim 2 or 3, wherein the information of the target cell comprises at least one of:

Wherein the target beam belongs to the target cell.

5. A method according to any one of claims 1 to 3, wherein the method further comprises:

establishing a transmission channel between the target DU and the target DU;

disconnecting a transmission channel with the source DU;

6. A method as claimed in any one of claims 1 to 3, wherein the CU receives first indication information transmitted by a source distribution unit DU, comprising:

7. A method according to any one of claims 1 to 3, wherein the method further comprises:

8. The method of claim 7, wherein the configuration information comprises at least one of:

9. A method according to any one of claims 1 to 3, wherein the second indication information is further for indicating: and activating the L3 configuration information of the target cell.

10. A handover indication method, comprising:

the source distribution unit DU determines that the terminal is to perform a serving cell update;

the source DU sends first indication information to the concentration unit CU, the first indication information being used to indicate that the terminal is about to perform a serving cell update.

11. The method of claim 10, wherein the first indication information comprises at least one of:

12. The method of claim 11, wherein the information of the target cell comprises at least one of:

wherein the target beam belongs to the target cell.

13. The method of any one of claims 10 to 12, further comprising at least one of:

the source DU disconnects a transmission channel with the CU;

14. The method of any of claims 10 to 12, wherein the source DU sends first indication information to a CU, comprising:

15. The method of any one of claims 10 to 12, wherein the method further comprises:

16. The method of claim 15, wherein the configuration information comprises at least one of:

17. A handover indication method, comprising:

establishing a Radio Link Control (RLC) layer;

establishing a Media Access Control (MAC) layer;

physical layer information is applied.

18. The method of claim 17, wherein the second indication information comprises at least one of:

19. The method of claim 18, wherein the information of the target cell comprises at least one of:

wherein the target beam belongs to the target cell.

20. The method of any one of claims 17 to 19, wherein the method further comprises:

the target DU establishes a transmission channel with the CU.

21. The method of any of claims 17 to 19, wherein the second indication information is further for indicating: and activating the L3 configuration information of the target cell.

22. A network element, which is a central unit CU, comprising: memory, transceiver, and processor, wherein:

Receiving first indication information sent by a source distribution unit DU;

23. The unit of claim 22, wherein the processor is further configured to:

establishing a transmission channel between the target DU and the target DU;

disconnecting a transmission channel with the source DU;

24. The unit of claim 22, wherein the second indication information is further for indicating: and activating the L3 configuration information of the target cell.

25. A network unit, the network unit being a source distribution unit DU, comprising: memory, transceiver, and processor, wherein:

Determining that the terminal is about to execute service cell update;

26. The unit of claim 25, wherein the unit further comprises at least one of:

the source DU disconnects a transmission channel with the CU;

27. A network element, the network element being a target distribution unit DU, comprising: memory, transceiver, and processor, wherein:

receiving second indication information sent by a centralized unit CU;

establishing a Radio Link Control (RLC) layer;

establishing a Media Access Control (MAC) layer;

physical layer information is applied.

28. The unit of claim 27, wherein the processor is further configured to:

The target DU establishes a transmission channel with the CU.

29. A central unit CU, characterized by comprising:

30. A distribution unit DU, the DU being a source DU, comprising:

31. A distribution unit DU, the DU being a target DU, comprising:

establishing a Radio Link Control (RLC) layer;

establishing a Media Access Control (MAC) layer;

physical layer information is applied.

32. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing the processor to execute the handover instruction method according to any one of claims 1 to 9, or for causing the processor to execute the handover instruction method according to any one of claims 10 to 16, or for causing the processor to execute the handover instruction method according to any one of claims 17 to 21.