WO2024022389A1

WO2024022389A1 - Cell connection method and apparatus, and related device

Info

Publication number: WO2024022389A1
Application number: PCT/CN2023/109339
Authority: WO
Inventors: 张艳霞
Original assignee: 维沃移动通信有限公司
Priority date: 2022-07-29
Filing date: 2023-07-26
Publication date: 2024-02-01
Also published as: CN117528673A

Abstract

The present application relates to the technical field of communications, and discloses a cell connection method and apparatus, and a related device. The cell connection method of embodiments of the present application comprises: a terminal receives handover assistance information provided by a source node, the handover assistance information comprising configuration information of a target cell; and the terminal establishes a connection with the target cell on the basis of the handover assistance information.

Description

Community connection methods, devices and related equipment

Cross-references to related applications

This application claims priority from Chinese Patent Application No. 202210911011.X filed in China on July 29, 2022, the entire content of which is incorporated herein by reference.

Technical field

This application belongs to the field of communication technology, and specifically relates to a cell connection method, device and related equipment.

Background technique

In Non-Terrestrial Networks (NTN) scenarios, satellite movement will lead to frequent service link and feeder link switching, resulting in all terminals in the NTN cell needing to switch frequently. Execute cell handover process. In addition, since the coverage area of NTN cell services is larger than that of Terrestrial Networks (TN) cells, the number of terminals served will be greater. Therefore, in NTN scenarios, how to manage the switching of a large number of terminals is a problem that needs to be solved.

Contents of the invention

Embodiments of the present application provide a cell connection method, device and related equipment, which can solve the problem that it is difficult for terminals to effectively perform handover when a large number of terminals perform handover.

In the first aspect, a cell connection method is provided, including:

The terminal receives handover assistance information provided by the source node, where the handover assistance information includes configuration information of the target cell;

The terminal establishes a connection with the target cell based on the handover assistance information.

In the second aspect, a cell connection method is provided, including:

The target node responds to the connection establishment process initiated by the terminal through the target cell;

Wherein, the connection establishment process is initiated by the terminal based on handover auxiliary information provided by a source node of the terminal, where the handover auxiliary information includes target cell configuration information, and the target cell belongs to the target node.

In the third aspect, community connection devices are provided, including:

A receiving module, configured to receive handover assistance information provided by the source node, where the handover assistance information includes configuration information of the target cell;

A connection module, configured to establish a connection with the target cell based on the handover assistance information.

In a fourth aspect, a cell connection device is provided, applied to a target node, and the device includes:

A response module, used to respond to the connection establishment process initiated by the terminal through the target cell;

In a fifth aspect, a terminal is provided. The terminal includes a processor and a memory, and the memory stores information that can be stored in the A program or instructions running on a processor, which when executed by the processor implement the steps of the method described in the first aspect.

In a sixth aspect, a terminal is provided, including a processor and a communication interface, wherein the communication interface is used to receive handover assistance information provided by a source node, where the handover assistance information includes configuration information of a target cell; the processor uses Establishing a connection with the target cell based on the handover assistance information.

In a seventh aspect, a network side device is provided. The network side device is a target node and includes a processor and a memory. The memory stores programs or instructions that can be run on the processor. The program or instructions are When executed by the processor, the steps of the method described in the second aspect are implemented.

In an eighth aspect, a network side device is provided, including a processor and a communication interface, wherein the processor is used to respond to a connection establishment process initiated by a terminal through a target cell; the connection establishment process is performed by the terminal based on the Initiated by handover assistance information provided by the source node, the handover assistance information includes target cell configuration information, and the target cell belongs to the target node.

A ninth aspect provides a communication system, including: a terminal and a network side device. The terminal can be used to perform the steps of the cell connection method as described in the first aspect. The network side device can be used to perform the steps of the cell connection method as described in the second aspect. The steps of the cell connection method.

In a tenth aspect, a readable storage medium is provided. Programs or instructions are stored on the readable storage medium. When the programs or instructions are executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method are implemented as described in the first aspect. The steps of the method described in the second aspect.

In an eleventh aspect, a chip is provided. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the method described in the first aspect. method, or implement a method as described in the second aspect.

In a twelfth aspect, a computer program/program product is provided, the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement as described in the first aspect method, or implement the method described in the second aspect.

In this embodiment of the present application, the source node provides target cell configuration information to terminals accessing the source node through handover assistance information, so that multiple terminals accessing the source node can determine the target cell based on the target cell configuration information, and then access the source node. The terminal entering the source node can then switch to the target cell based on the handover assistance information. In this way, the source node sends handover auxiliary information to multiple terminals that establish connections with it, thereby ensuring that the terminals can implement effective handover and effectively saving system signaling overhead.

Description of drawings

Figure 1a is one of the block diagrams of a wireless communication system applicable to the embodiment of the present application;

Figure 1b is the second block diagram of a wireless communication system applicable to the embodiment of the present application;

Figure 2 is a flow chart of a cell connection method provided by an embodiment of the present application;

Figure 3 is a flow chart of another cell connection method provided by an embodiment of the present application;

Figure 4 is a structural diagram of a cell connection device provided by an embodiment of the present application;

Figure 5 is a structural diagram of another cell connection device provided by an embodiment of the present application;

Figure 6 is a structural diagram of a communication device provided by an embodiment of the present application;

Figure 7 is a structural diagram of a terminal provided by an embodiment of the present application;

Figure 8 is a structural diagram of a network side device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art fall within the scope of protection of this application.

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

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

Figure 1a shows a block diagram of a wireless communication system to which embodiments of the present application are applicable. The wireless communication system includes a terminal 11 and a network side device 12. The terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), or a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a palmtop computer, a netbook, or a super mobile personal computer. (ultra-mobile personal computer, UMPC), mobile Internet device (Mobile Internet Device, MID), augmented reality (AR)/virtual reality (VR) equipment, robots, wearable devices (Wearable Device) , Vehicle User Equipment (VUE), Pedestrian User Equipment (PUE), smart home (home equipment with wireless communication functions, such as refrigerators, TVs, washing machines or furniture, etc.), game consoles, personal computers (personal Terminal-side devices such as computer (PC), teller machine or self-service machine, wearable devices include: smart watches, smart phones, etc. Bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. It should be noted that the embodiment of the present application does not limit the specific type of the terminal 11. The network side device 12 may include an access network device or a core network device, where the access network device may also be called a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function or a wireless access network unit. Access network equipment may include a base station, a Wireless Local Area Network (WLAN) access point or a WiFi node, etc. The base station may be called a Node B, an Evolved Node B (eNB), an access point, a base transceiver station ( Base Transceiver Station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), home B-node, home evolved B-node, transmitting and receiving point ( Transmitting Receiving Point (TRP) or some other appropriate terminology in the field, as long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiment of this application, only in the NR system The base station is introduced as an example, and the specific type of base station is not limited. Core network equipment may include but is not limited to at least one of the following: core network nodes, core network functions, mobility management entities (Mobility Management Entity, MME), access mobility management functions (Access and Mobility Management Function, AMF), session management functions (Session Management Function, SMF), User Plane Function (UPF), Policy Control Function (PCF), Policy and Charging Rules Function (PCRF), Edge Application Service Discovery function (Edge Application Server Discovery Function, EASDF), Unified Data Management (UDM), Unified Data Repository (UDR), Home Subscriber Server (HSS), centralized network configuration ( Centralized network configuration (CNC), Network Repository Function (NRF), Network Exposure Function (NEF), Local NEF (Local NEF, or L-NEF), Binding Support Function (Binding Support Function, BSF), application function (Application Function, AF), etc. It should be noted that in the embodiment of this application, only the core network equipment in the NR system is used as an example for introduction, and the specific type of the core network equipment is not limited.

For better understanding, related concepts that may be involved in the embodiments of this application are explained below.

Introduction to NTN:

Typical NTN deployment scenarios are as follows: In the R17 version, terminals, base stations and core network equipment are all deployed on the ground, and communication data between terminals and network equipment are relayed via satellites in the air. Compared with terrestrial communications (Terrestrial Networks, TN) systems, satellite-based non-terrestrial communications systems have wider coverage, and the number of users served by NTN cells will be much larger than that of TN cells.

As shown in Figure 1b, the link between the UE and the satellite is called the service link, and the link between the satellite and the base station is called the feeder link. In some scenarios (such as Low Earth Orbit Satellite (LEO)), service link and/or feeder link switching will occur due to satellite movement. For service link handover, the serving satellites of all UEs in the cell need to be switched from one satellite to another satellite. For feeder link switching, a certain satellite needs to switch from one gateway (or base station) to another gateway (or base station). In the R17 version, whether it is service link switching or feeder link switching scenario, for all UEs in the NTN cell That is, the cell handover process needs to be performed.

The cell connection method provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings through some embodiments and application scenarios.

Please refer to Figure 2. Figure 2 is a flow chart of a cell connection method provided by an embodiment of the present application. As shown in Figure 2, the method includes the following steps:

Step 201: The terminal receives handover assistance information provided by the source node, where the handover assistance information includes the configuration information of the target cell;

Step 202: The terminal establishes a connection with the target cell based on the handover assistance information.

In the embodiment of the present application, the handover auxiliary information includes the configuration information of the target cell, and the terminal can determine the target cell based on the configuration information of the target cell, so that the terminal can establish a connection with the target cell based on the handover auxiliary information. to switch from the source serving cell to the target cell. The terminal may establish a connection with a target node to which the target cell belongs to switch to the target cell.

It should be noted that the cell connection method provided by the embodiment of the present application may be suitable for cell handover in an NTN scenario. Understandably, the satellite-based NTN communication system has a wider coverage area, and the number of terminals served by NTN cells is also larger. When service link switching and/or feeder link switching occurs, a large number of terminals in the NTN cell need to perform switching. In the embodiment of the present application, the source node provides target cell configuration information to terminals accessing the source node through switching auxiliary information, so that multiple terminals accessing the source node can determine the target cell based on the target cell configuration information, and then access the source node. The terminal entering the source node can then switch to the target cell. In this way, the source node can send handover auxiliary information to multiple terminals that establish connections with it, effectively saving system signaling overhead.

Optionally, the handover assistance information is provided by the source node through broadcast or multicast, for example, through system messages. The source node sends the handover auxiliary information through broadcast or multicast, and then the source node can broadcast or multicast the handover auxiliary information to multiple terminals through a single sending behavior, without having to send it one-to-one, effectively saving system information. Order overhead.

Optionally, the handover assistance information also includes a time trigger event, and the time trigger event is used to indicate the timing for the terminal to establish a connection with the target cell. For example, the time trigger event includes time information such as a time point or time period used to instruct the terminal to establish a connection with the target cell, and the terminal can establish a connection with the target cell at a specific time point or time period based on the time trigger event.

Exemplarily, the source node may broadcast and provide a time-triggered event through switching auxiliary information. The time-triggered event is used to indicate the first cell in the first cell when a service link switch and/or a feeder link switch occurs. The time when the terminal can establish a connection with the target cell. In this way, by carrying a time trigger event in the handover assistance information, the source node can instruct the terminal to perform cell handover at a specific timing. The terminal in the NTN cell can independently initiate the cell switching process when the time trigger event is satisfied.

The terminal establishing a connection with the target cell based on the handover assistance information includes:

When the first condition is met, the terminal establishes a connection with the target cell;

Wherein, the first condition includes any one of the following:

Receive a handover instruction sent by the source node; wherein the handover instruction is used to instruct the terminal to establish a connection with the target cell;

The time trigger event has been met.

For example, when the terminal receives a handover instruction sent by the source node, the terminal learns that cell switching needs to be performed based on the handover instruction. Then, after the terminal determines the target cell through the target cell configuration information, it switches to the cell based on the handover instruction. The target cell. The handover indication may be carried in the handover assistance information, or may be additionally sent by the source node.

Optionally, the switching indication is scheduled through a group identifier.

Optionally, the group identifier is a dedicated scheduling identifier used to instruct the terminal to perform cell switching based on handover assistance information, such as a handover-Radio Network Temporary Identifier (HO-RNTI).

For example, the source node may instruct the terminal in the first cell (the cell belonging to the source node) to initiate a communication with the target node (the network node to which the target cell belongs) through group downlink control information (DCI). Connection establishment process. Optionally, when a service link switch (service link switch) and/or a feeder link switch (feeder link switch) are about to occur, the source node can instruct the terminal in the first cell to initiate communication with the target node through the group DCI. Connection establishment process. In this way, through the handover instruction scheduled by the group identifier, the source node can instruct all terminals in the first cell to perform cell handover, thereby effectively saving system signaling overhead.

Alternatively, the terminal receives handover auxiliary information provided by the source node. The handover auxiliary information includes the configuration information of the target cell and the time trigger event. When the time trigger event is satisfied, the terminal establishes a connection with the target cell. Wherein, the time trigger event is used to indicate the timing for the terminal to establish a connection with the target cell. For example, the timing is a time point or a time period. That is, if the current moment reaches the time point or time period, the terminal will be connected to the target cell at this timing. The target cell establishes a connection. In this way, the source node can instruct the terminal to perform cell switching at a specific moment based on the time trigger event, thereby better managing the terminal.

In this embodiment of the present application, establishing a connection between the terminal and the target cell based on the handover assistance information includes at least one of the following:

The terminal initiates a first connection reestablishment process with the target cell based on the handover assistance information;

The terminal initiates a random access process with the target cell based on the handover assistance information.

For example, in one embodiment, after the terminal receives the handover assistance information provided by the source node, the terminal initiates a first connection reestablishment process with the target cell based on the handover assistance information. Optionally, the first connection reestablishment process may be a connection reestablishment process initiated by the terminal with the target cell when the first condition is met. The first condition includes that the terminal receives a switching indication or a time trigger event sent by the source node and is satisfied, that is, the terminal initiates the first connection reestablishment process only when certain conditions are met.

Or, in another implementation manner, after the terminal receives the handover assistance information provided by the source node, the terminal initiates a random access process with the target cell based on the handover assistance information. Wherein, the random access process may be a contention-based random access process.

Optionally, the method also includes:

When the terminal initiates the first connection reestablishment process with the target cell, the terminal sends first indication information to the target node, and the first indication information is used to indicate the reason for the connection reestablishment between the terminal and the target cell;

When the terminal initiates a random access process with the target cell, the terminal sends second indication information to the target node. The second indication information is used to indicate the terminal identification and source of the source serving cell. At least one of the cell identifiers of the serving cell;

Wherein, the target node is a network node to which the target cell belongs.

For example, when the terminal initiates the first connection reestablishment process with the target cell, the terminal may also send first indication information to the target node indicating the reason for the connection reestablishment between the terminal and the target cell, thereby causing The target node can learn the reason for which the terminal initiates the first connection reestablishment process.

Optionally, the reason for connection reestablishment includes at least one of the following:

Handover based on handover auxiliary information;

Switching based on broadcast or multicast;

The source serving cell has stopped serving or will stop serving.

For example, the reason for the connection reestablishment may be handover based on handover auxiliary information, that is, the terminal receives the handover auxiliary information from the source node to instruct the terminal to perform cell handover, and the terminal may initiate the first connection reestablishment with the target cell. During the process, the terminal sends first indication information to the target node to which the target cell belongs. The first indication information is used to indicate that the reason for reestablishing the connection between the terminal and the target cell is handover based on handover assistance information.

Alternatively, the reason for reestablishing the connection between the terminal and the target cell may also be a switching based on broadcast or multicast, for example, to indicate that the terminal is switching based on the group DCI sent by the source node, or to indicate that the terminal is switching based on the source node. A handover performed by a node via broadcast or multicast provided handover auxiliary parameters. The reason for reestablishing the connection between the terminal and the target cell may also be that the source serving cell has stopped serving or is about to stop serving, or it may be a handover based on handover assistance information, or the like.

In the embodiment of the present application, the terminal indicates the reason for reestablishing the connection with the target cell through the first indication information, and then the target node can learn why the terminal initiates the reestablishment of the connection with the target cell, that is, it can learn the scenario and the scenario in which the terminal is currently located. state.

Optionally, in the case where the terminal initiates a first connection reestablishment process with the target cell, the method further includes:

The terminal starts a first timer; wherein the first timer is used to determine whether the first connection reestablishment between the terminal and the target node is successful.

For example, the terminal may start a first timer when initiating the first connection reestablishment process with the target cell to determine whether the terminal establishes a connection with the target cell within the time period of the first timer. If the terminal establishes a connection with the target cell within the time of the first timer, it is determined that the first connection between the terminal and the target node is reestablished successfully; if the first timer times out, it is determined that the first connection between the terminal and the target node is reestablished failed. . In this way, the terminal can accurately determine whether the first connection reestablishment with the target node is successful by starting the first timer.

Optionally, the method also includes one or more of the following:

In the event that the first timer times out, the first connection reestablishment process between the terminal and the target node occurs. fail;

In the event that the first timer times out, the terminal initiates a second connection reestablishment process with the target node;

If the first connection between the terminal and the target node is successfully reestablished, the terminal stops the first timer.

For example, when the first timer times out, it may be determined that the first connection reestablishment process between the terminal and the target node fails. Further, in this case, the terminal may initiate a second connection reestablishment process with the target node. The second connection reestablishment process may also refer to a conventional connection reestablishment process, that is, a connection reestablishment process that does not require the terminal to meet the first condition. For example, the terminal does not need to trigger a time trigger event based on handover auxiliary information or handover instructions, and can initiate a second connection reestablishment process with the target node to ensure that when the first timer times out, the terminal can reestablish a second connection based on The process realizes the connection with the target cell. It should be noted that the second connection reestablishment process is a conventional connection reestablishment process, which can be understood as a related connection reestablishment process used in a non-handover scenario in the mechanism of the related art.

In addition, if the first connection between the terminal and the target node is successfully reestablished, the terminal stops the first timer.

It should be noted that when the terminal initiates the first connection reestablishment process with the target cell, if the target node does not have the context of the terminal, the target node sends a request to extract the context of the terminal to the source node. first request.

It should be noted that the scenario in which the target node does not have the context of the terminal includes the following situations:

(1): The target cell and the source serving cell of the terminal do not belong to the same network device. It can be understood that since only the source node of the terminal will have the context information of the terminal, if the target cell and the source serving cell of the terminal do not belong to the same network device, it means that the target node and the source node of the terminal are not The same network side device, so the target node does not have the context information of the terminal.

(2): Before handover, the source base station of the terminal does not forward the context of the terminal to the target node. Exemplarily, before handover, the source node of the terminal may negotiate with the target node. The negotiation process may include: the source node providing at least one terminal information to the target node, where the terminal information includes the source serving cell identifier of the terminal, The user identification of the terminal in the source serving cell. The source node reports to the target base station which users will be handed over to the target cell through the negotiation process. However, in this process, the source node does not provide the context information of the terminal. When a terminal initiates a connection establishment process with a target node, the target node needs to request the source node of the terminal to extract context information of the terminal.

Optionally, the first request also includes at least one of the following:

Context identification information of the terminal that initiated the first connection reestablishment process;

Reason information for requesting extraction of the context of the terminal.

Wherein, the context identification information includes at least one of the terminal identification of the terminal in the source serving cell and the cell identification of the source serving cell.

The reason information for requesting to extract the context of the terminal includes at least one of the following:

Handover based on handover auxiliary information;

Switching based on broadcast or multicast;

The source serving cell has stopped serving or will stop serving.

In this way, the target node sends a first request to the source node, carrying in the first request the context identification information of the terminal that initiated the first connection reestablishment process and/or the reason information for requesting to extract the context of the terminal, to Ensure that the target node can successfully obtain the context of the terminal from the source node, ensure that the target node can respond to the first connection reestablishment process initiated by the terminal, and ensure that the terminal can successfully switch to the target cell.

It should be noted that during the first connection reestablishment process, the terminal may provide security verification information, and the security verification information may be generated based on the source security parameters of the terminal. When the target node requests the source node of the terminal to extract context information of the terminal, the target node may send the source security parameter to the source node. The source node verifies and determines whether the context of the terminal can be extracted based on the security parameter verification. For example, if the verification passes, the target node may be allowed to extract the security context of the terminal. If the verification fails, the target node is refused to extract the security context of the terminal.

In the embodiment of the present application, when the terminal initiates a random access process with the target cell, the terminal sends second indication information to the target node, and the second indication information is used to indicate that the terminal is in the source serving cell. At least one of the terminal identification and the cell identification of the source serving cell. The source serving cell belongs to the source node, that is, the cell where the terminal currently resides.

It should be noted that the terminal may correspond to different terminal identities in different cells. For example, the terminal identity may include identification information indicating the cell in which the terminal currently resides. When the terminal initiates a random access process with the target cell, the terminal will send the terminal identification of the source serving cell and/or the cell identification of the source serving cell to the target node, and then the target node will be able to learn that the terminal is in the process before handover. Which community does it belong to.

Optionally, the second indication information may also include identity verification information, and the network side may perform identity verification on the terminal based on the identity verification information. When the network side authenticates the terminal, the target node may send random access success indication information to the terminal, so that the terminal can learn that it has been switched to the target cell. It should be noted that the terminal can provide security verification information, and the security verification information can be generated based on the source security parameters of the terminal. The target node may request the source node to authenticate the terminal, or in the case where the target node has terminal context, the target node authenticates the terminal. If the verification is passed, the terminal can be allowed to establish a connection with the target node.

It should be noted that the second indication information may be carried through a newly introduced Radio Resource Control (Radio Resource Control, RRC) message, or a Media Access Control (Medium Access Control, MAC) layer message.

Optionally, in the case where the terminal sends the second indication information to the target node, the method further includes:

The terminal receives third indication information sent by the target node, where the third indication information is used to indicate that the random access process is successful.

For example, when the target node receives the second indication information sent by the terminal, if the terminal is a terminal that the source node has reported to the target node, the target node sends the third indication information to the terminal, so as to Indicates that the random access process initiated by the terminal is successful. The information content of the third indication information may be information related to the second indication information. The content of the information is consistent (or identical), and then the second instruction information is fed back or responded to.

Optionally, the third indication information includes at least one of the terminal identification of the terminal in the source serving cell and the source serving cell identification.

Optionally, the method may also include:

When the first connection is reestablished successfully or the random access is successful, the terminal receives a reconfiguration message sent by the target node, and the reconfiguration message is used to update the terminal's configuration on the target node. security parameters.

It can be understood that the terminal updates the security parameters of the terminal at the target node based on the reconfiguration information sent by the target node, such as key update configuration parameters, security algorithm configuration parameters, etc.

It should be noted that the third indication information and the reconfiguration message may be sent in the same MAC data packet.

In this embodiment of the present application, the handover assistance information sent by the source node may include configuration information of multiple target cells. In this case, the process of establishing a connection between the terminal and the target cell based on the handover assistance information includes:

In the case where the handover assistance information includes configuration information of multiple target cells, the terminal selects the first target cell based on the area information associated with the target cell and the location information of the terminal;

The terminal establishes a connection with the first target cell based on the configuration information of the first target cell.

It should be noted that the configuration information of a target cell may include area information of the target cell. The terminal may determine which target cell is associated with the area information based on its current location, and then determine the first target cell. The area information associated with a target cell also covers the current location of the terminal. Further, the terminal establishes a connection with the first target cell. In this way, the terminal can determine the first target cell to be finally accessed through its own location information and the area information associated with each target cell.

Optionally, the terminal selects the first target cell based on the area information associated with the target cell and the location information of the terminal, including:

When the location of the terminal is within the coverage represented by the first area information, the terminal uses the target cell associated with the first area information as the first target cell.

It can be understood that, in the case where the handover assistance information includes configuration information of multiple target cells, the terminal can determine which target cell is within the coverage represented by the area information associated with it based on the current location. If the location of the terminal is located Within the coverage range represented by the first area information, the terminal determines the target cell associated with the first area information as the first target cell, and enters to establish a connection with the first target cell.

In the embodiment of the present application, the source node provides handover auxiliary information through broadcast or multicast. The handover auxiliary information includes the configuration information of the target cell. Then the terminal can determine the target cell based on the handover auxiliary information and communicate with the target cell. The community establishes a connection. In this way, the source node can broadcast or multicast the handover auxiliary information to multiple terminals through one sending behavior, without the need to send it one-to-one, effectively saving system signaling overhead.

Please refer to Figure 3. Figure 3 is a flow chart of another cell connection method provided by an embodiment of the present application. As shown in Figure 3, the method includes the following steps:

Step 301: The target node responds to the connection establishment process initiated by the terminal through the target cell.

In the embodiment of the present application, the handover auxiliary information includes the configuration information of the target cell, and the terminal can determine the target cell based on the configuration information of the target cell. The terminal initiates a connection establishment process with the target cell based on the handover auxiliary information. , the target node responds to the connection establishment process initiated by the terminal to establish a connection with the terminal, and the response result may be a connection success or a connection failure.

The handover assistance information is provided by the source node through broadcast or multicast, for example, through system messages. The source node sends the handover auxiliary information through broadcast or multicast, and then the source node can broadcast or multicast the handover auxiliary information to multiple terminals through a single sending behavior, without having to send it one-to-one, effectively saving system information. Order overhead.

In the embodiment of the present application, the target node can respond to the connection establishment process initiated by the terminal through the target cell. The connection establishment process is initiated by the terminal based on the handover assistance information provided by the source node. Optionally, multiple terminals may simultaneously initiate a connection establishment process with the target node based on the handover assistance information provided by the source node. That is, the target node may respond to the connection establishment process sent by multiple terminals to save system signaling. overhead.

Optionally, the connection establishment process includes at least one of the following:

The first connection reestablishment process initiated by the terminal based on the handover assistance information;

The terminal initiates a random access process based on handover assistance information.

Optionally, the method also includes:

When the terminal initiates a first connection reestablishment process based on handover assistance information, the target node receives the first indication information sent by the terminal, and the first indication information is used to instruct the terminal to reestablish a connection with the target cell. s reason;

When the terminal initiates a random access process based on handover assistance information, the target node receives the second indication information sent by the terminal, and the second indication information is used to indicate that the terminal is in the source serving cell. At least one of the identification and the cell identification of the source serving cell.

It should be noted that for the specific implementation process of the first connection reestablishment process and/or the random access process initiated by the terminal based on the handover assistance information, please refer to the description in the above terminal side method embodiment. To avoid duplication, they will not be described again here.

Optionally, in the case where the terminal initiates the first connection reestablishment process based on the handover assistance information, the method further includes:

If the target node does not have the context of the terminal, the target node sends a first request to the source node of the terminal, where the first request is used to request to extract the context of the terminal.

In the embodiment of the present application, when the terminal initiates the first connection reestablishment process to the target node based on the handover assistance information, if the target node does not have the context of the terminal, the target node requests the source node to extract the context of the terminal. , such as the terminal’s network information, bearer information, etc., to ensure that the terminal can successfully establish a connection with the target node and ensure smooth communication between the terminal and the network.

Optionally, the first request also includes at least one of the following:

Reason information for requesting extraction of the context of the terminal.

Optionally, the context identification information includes at least one of the terminal identification of the terminal in the source serving cell and the cell identification of the source serving cell. Wherein, the source serving cell is also the cell where the terminal resides before switching to the target cell, and the source serving cell belongs to the source node.

Optionally, the reason information for requesting to extract the context of the terminal includes at least one of the following:

Handover based on handover auxiliary information;

Switching based on broadcast or multicast;

The source serving cell has stopped serving or will stop serving.

It can be understood that the target node sends a first request to the source node, and the first request carries the context identification information of the terminal that initiated the first connection reestablishment process and/or the reason information for requesting to extract the context of the terminal. , to ensure that the target node can successfully obtain the context of the terminal from the source node, to ensure that the target node can respond to the first connection reestablishment process initiated by the terminal, and to ensure that the terminal can successfully switch to the target cell.

Optionally, if the target node does not have the context of the terminal, the target node sends a first request to the source node of the terminal, including:

If the target node does not have the context of the terminal, the target node sends a first request to the source node of the terminal based on the second indication information.

In this embodiment of the present application, when the terminal initiates a random access process based on handover assistance information, the target node receives the second instruction information sent by the terminal, and the second instruction information is used to instruct the terminal At least one of the terminal identification of the source serving cell and the cell identification of the source serving cell. If the target node does not have the context of the terminal, the target node may determine the source node based on the terminal identification of the terminal in the source serving cell and/or the cell identification of the source serving cell, and request the source node to extract the terminal's context. Context to ensure that the target node can obtain the context of the terminal and ensure that the terminal can smoothly access the target node.

Optionally, in the case where the target node receives the second indication information sent by the terminal, the method further includes:

The target node sends third indication information to the terminal, where the third indication information is used to indicate that the random access process is successful.

For example, when the target node receives the second indication information sent by the terminal, if the terminal is a terminal that the source node has reported to the target node, the target node sends the third indication information to the terminal, so as to Indicates that the random access process initiated by the terminal is successful. The information content of the third indication information may be consistent with the information content of the second indication information, so as to provide feedback or response to the second indication information.

Optionally, the target node can also perform identity verification on the terminal based on the identity verification information provided by the terminal. If the identity verification passes, the target node sends the third indication information to the terminal to instruct the terminal. The initiated random access process was successful.

Optionally, the method also includes:

When the target node successfully obtains the context of the terminal, the target node sends a first connection reestablishment response message to the terminal, and the first connection reestablishment response message is used to indicate the first connection reestablishment. success.

It should be noted that the scenarios in which the target node successfully obtains the context of the terminal include the following situations:

(1): The target cell and the source serving cell of the terminal belong to the same network device. It can be understood that since only the source node of the terminal will have context information of the terminal, if the target cell and the source serving cell of the terminal belong to the same network device, it means that the target node and the source node of the terminal are the same. network-side device, so the target node also has the context information of the terminal, and therefore can obtain the context information of the terminal. It should be emphasized that in this case, the target node does not need to initiate the process of extracting the context of the terminal.

(2): Before handover, the source base station of the terminal forwards the context of the terminal to the target node. Exemplarily, before handover, the source node of the terminal may negotiate with the target node. The negotiation process may include: the source node providing at least one terminal information to the target node, where the terminal information includes the source serving cell identifier of the terminal, The user identification of the terminal in the source serving cell. Additionally, the source node also provides context information about the terminal. The source node reports to the target base station which users will be handed over to the target cell through the negotiation process. When the terminal initiates the connection establishment process with the target node, since the target node already has the context information of the terminal, it does not need to request the source node of the terminal to extract the context information of the terminal. In this case, it is also called that the target node obtains the context of the terminal.

(3): Before handover, the source base station of the terminal does not forward the context of the terminal to the target node. Exemplarily, before handover, the source node of the terminal may negotiate with the target node. The negotiation process may include: the source node providing at least one terminal information to the target node, where the terminal information includes the source serving cell identifier of the terminal, The user identification of the terminal in the source serving cell. The source node reports to the target base station which users will be handed over to the target cell through the negotiation process. However, in this process, the source node does not provide the context information of the terminal. When a terminal initiates a connection establishment process with a target node, the target node needs to request the source node of the terminal to extract the context information of the terminal. interest. If the source node agrees to extract the context information of the terminal, it is also called that the target node obtains the context information of the terminal.

It should be noted that during the first connection reestablishment process, the terminal may provide security verification information, and the security verification information may be generated based on the source security parameters of the terminal. In one case, when the target node requests the source node of the terminal to extract the context information of the terminal, the target node may send the source security parameter to the source node. The source node verifies and determines whether the context of the terminal can be extracted based on the security parameter verification. For example, if the verification passes, the target node may be allowed to extract the security context of the terminal. If the verification fails, the target node is refused to extract the security context of the terminal. If the source node agrees with the target node to extract the terminal's security context, it is considered that the target node has successfully obtained the terminal's context information. Another situation is that the target node has the context information of the terminal, and the target node determines whether it can agree to the terminal access based on the security parameter verification. For example, if the verification is passed, the terminal is allowed to access, which may send a first connection reestablishment response message. If the verification fails, the target node can instruct the terminal to fall back to the RRC connection establishment process, or deny terminal access.

The first connection reestablishment response message may carry at least one of the terminal identification of the terminal in the source serving cell and the cell identification of the source serving cell.

In the embodiment of this application, the method further includes:

When the first connection is reestablished successfully or the random access is successful, the target node sends a reconfiguration message to the terminal, and the reconfiguration message is used to update the security of the terminal at the target node. parameter.

It can be understood that when the first connection initiated by the terminal is reestablished successfully or the random access is successful, the target node sends a reconfiguration message to the terminal to update the security parameters of the terminal on the target node. , such as key update configuration parameters, wireless bearer configuration parameters, etc.

Optionally, the third indication information and the reconfiguration message may be sent in the same MAC data packet.

It should be noted that the cell connection method performed by the target node provided in the embodiment of the present application corresponds to the cell connection method on the terminal side mentioned above. The relevant concepts and specific implementation processes involved in the embodiment of the present application can be referred to the description in the above embodiment. , which will not be described in detail here.

In order to better understand the technical solution provided by this application, an example is provided below for detailed description.

Embodiment 1

Step 1: The source node sends handover auxiliary information, and the handover auxiliary information is sent by broadcast or multicast. Wherein, the handover assistance information includes target cell configuration information, and the target cell belongs to the target node.

Optionally, when the first condition is met, the UE in the first cell managed by the source node initiates a connection establishment process with the target node based on the target cell configuration information. Wherein, the first condition includes any of the following:

(1) Receive a handover instruction sent by the source node, where the handover instruction is used to instruct the UE in the first cell to establish a connection with the target node. Wherein, the switching instruction information may be scheduled through a group identifier. The group identifier may be a dedicated scheduling identifier based on broadcast/multicast switching assistance information switching, such as H-RNTI. For example, the source base station may instruct the UE in the first cell to initiate a connection establishment process with the target node through the group DCI. For example, when service link switch and/or feeder link switch is about to occur, the source node may instruct the UE in the first cell to initiate a connection establishment process with the target node through group DCI.

(2) The handover assistance information also includes time-based handover trigger event information (that is, the above-mentioned time trigger event). Optionally, the UE initiates a connection establishment process with the target node based on the handover trigger event information. Wherein, the time-based switching triggering event information is used to indicate the time point and/or time period information at which a connection can be established with the target node. Exemplarily, the source node may broadcast and provide time-based switching trigger event information, which is used to indicate that when a service link switch and/or a feeder link switch occurs in the first cell, the UE in the first cell may communicate with the The timing when the target node establishes the connection.

Optionally, the UE in the first cell managed by the source node establishing a connection with the target node based on the target cell configuration information includes one or more of the following:

(1) When the handover assistance information includes configuration information of multiple target cells, select a first target cell based on the area information associated with the target cell and UE location information, and initiate a communication with the first target cell through the first target cell. The connection establishment process of the target node. For example, when the (current or latest valid) location of the UE is within the coverage represented by the area information, the UE selects to establish a connection with the target node through the target cell associated with the area information.

(2) The UE triggers a conditional connection reestablishment process with the target cell (that is, the above-mentioned first connection reestablishment process), wherein the conditional connection reestablishment process is a connection reestablishment process initiated when the first condition is met.

(3) The UE triggers the random access process. Wherein, the random access process is a random access process with the target node initiated when the first condition is met; the random access process is a competition-based random access process.

Wherein, first indication information is carried during the connection reestablishment process, and the first indication information is used to indicate the reason for connection reestablishment. The reason for the connection reestablishment may be switching based on broadcast/multicast switching parameters, or the source serving cell stops serving. In addition, it should be noted that the first indication information may be used by the target node to determine that the connection reestablishment process is a conditional connection reestablishment process. Additionally, when triggering the conditional connection reestablishment process, the UE starts a first timer, and the first timer is used to determine whether the connection establishment between the UE and the target node is successful. For example, when the first timer times out and it is determined that the connection establishment between the UE and the target node fails, the UE falls back to the conventional connection reestablishment process (that is, the above-mentioned second connection reestablishment process). When the UE successfully establishes a connection with the target node, the UE stops the first timer.

The random access process may carry second indication information, and the second indication information is used to indicate the UE identity of the UE in the source cell and the source cell identity. Additionally, authentication information can be provided. The second indication information may be carried through a newly introduced RRC message or a MAC layer message.

Step 2: The target node responds to the connection establishment process initiated by the UE. Wherein, the target node responds to the connection establishment process initiated by the UE, including one or more of the following:

(1) When the connection establishment process is a conditional connection reestablishment process, if the target node does not have the context of the UE, it requests the source node of the UE to extract the context of the UE. Wherein, the request for extracting the UE context carries the UE context identification information for conditional connection reestablishment (such as the UE identification of the UE in the source cell and the source cell identification of the source cell that stopped the service) or carries the reason information for extracting the context. The reason for extracting the context may be switching based on broadcast/multicast switching parameters, or the source serving cell stops serving.

(2) When the second indication information is received, if the UE is a UE that the source node of the UE has reported to the target node, then send successful access indication information to the UE, The successful access indication information may include the source UE identity and the source cell identity of the UE. Additionally, the target node sends a reconfiguration message to the UE, where the reconfiguration message is used to update the configuration of the UE on the target node. The configuration includes key update configuration, wireless bearer configuration, etc. It should be noted that the successful access indication information and the reconfiguration message may be sent in the same MAC data packet. In this method, before the target node responds to the connection establishment process initiated by the UE, the source node of the UE reports (or provides) the UE association information to the target node, and the UE association information is Instructing the UE to establish a connection with the target node. The UE association information may include the source UE identity and source cell identity of the UE; additionally, it may include the context of the UE.

(3) If the target node does not have the context of the UE, request the source node of the UE to extract the context of the UE based on the second indication information. If the context of the UE is successfully obtained or if the target node passes the verification of the UE, random access success indication information is sent to the UE. The random access success indication information may carry the UE identity of the UE at the source node and the source cell identity. Additionally, the target node sends a reconfiguration message to the UE, where the reconfiguration message is used to update the configuration of the UE on the target node. The configuration includes key update configuration, wireless bearer configuration, etc.

For the cell connection method provided by the embodiment of the present application, the execution subject may be a cell connection device. In the embodiment of the present application, the cell connection device performing the cell connection method is taken as an example to illustrate the cell connection device provided by the embodiment of the present application.

Please refer to Figure 4, which is a structural diagram of a cell connection device provided by an embodiment of the present application. As shown in Figure 4, the cell connection device 400 includes:

The receiving module 401 is configured to receive handover assistance information provided by the source node, where the handover assistance information includes the configuration information of the target cell;

The connection module 402 is configured to establish a connection with the target cell based on the handover assistance information.

Optionally, the handover assistance information is provided through broadcast or multicast.

Optionally, the handover assistance information also includes a time trigger event, and the time trigger event is used to indicate the timing for the terminal to establish a connection with the target cell.

Optionally, the connection module 402 is also used to:

When the first condition is met, establish a connection with the target cell;

Wherein, the first condition includes any one of the following:

Receive a handover instruction sent by the source node; wherein the handover instruction is used to instruct the device to establish a connection with the target cell;

The time trigger event has been met.

Optionally, the switching indication is scheduled through a group identifier.

Optionally, the group identifier is a dedicated scheduling identifier used to instruct the device to perform cell switching based on handover assistance information.

Optionally, the connection module 402 is also used to perform at least one of the following:

Initiate a first connection reestablishment process with the target cell based on the handover assistance information;

Initiate a random access process with the target cell based on the handover assistance information.

Optionally, the device further includes a sending module for:

When the terminal initiates the first connection reestablishment process with the target cell, send first indication information to the target node, where the first indication information is used to indicate the reason for the connection reestablishment between the device and the target cell;

When the terminal initiates a random access process with the target cell, second indication information is sent to the target node. The second indication information is used to instruct the device to identify the terminal of the source serving cell and the source serving cell. At least one of the community identifiers;

Wherein, the target node is a network node to which the target cell belongs.

Handover based on handover auxiliary information;

Switching based on broadcast or multicast;

The source serving cell has stopped serving or will stop serving.

Optionally, in the case where the device initiates a first connection reestablishment process with the target cell, the device further includes:

A starting module, configured to start a first timer; wherein the first timer is used to determine whether the first connection reestablishment between the device and the target node is successful.

Optionally, the device further includes an execution module, configured to execute one or more of the following:

In the event that the first timer times out, it is determined that the first connection reestablishment process with the target node fails;

In the event that the first timer times out, initiate a second connection reestablishment process with the target node;

If the first connection between the device and the target node is successfully reestablished, the first timer is stopped.

Optionally, when the device sends the second indication information to the target node, the receiving module 401 is also used to:

Receive third indication information sent by the target node, where the third indication information is used to indicate that the random access process is successful.

Optionally, the third indication information includes at least one of the terminal identification of the source serving cell and the source serving cell identification of the device.

Optionally, the receiving module 401 is also used to:

If the first connection is successfully reestablished or the random access is successful, a reconfiguration message sent by the target node is received, and the reconfiguration message is used to update the security parameters of the device at the target node.

Optionally, the connection module 402 is also used to:

In the case where the handover assistance information includes configuration information of multiple target cells, selecting the first target cell based on the area information associated with the target cell and the location information of the device;

Establishing a connection with the first target cell based on the configuration information of the first target cell.

Optionally, the connection module 402 is also used to:

When the location of the device is within the coverage represented by the first area information, the target cell associated with the first area information is used as the first target cell.

In the embodiment of the present application, the source node provides target cell configuration information to the device accessing the source node through switching auxiliary information, so that multiple devices accessing the source node can determine the target cell based on the target cell configuration information, to switch to the target cell. In this way, the source node effectively saves system signaling overhead by sending the handover auxiliary information to multiple devices that establish connections with it.

It should be noted that the cell connection device may be an electronic device, such as an electronic device with an operating system, or may be a component in the electronic device, such as an integrated circuit or chip. The electronic device may be a terminal or other devices other than the terminal. For example, terminals may include but are not limited to the types of terminals 11 listed above, and other devices may be servers, network attached storage (Network Attached Storage, NAS), etc., which are not specifically limited in the embodiment of this application.

The cell connection device provided by the embodiment of the present application can implement each process implemented by the terminal in the method embodiment of Figure 2, and achieve the same technical effect. To avoid duplication, the details will not be described here.

Please refer to FIG. 5 , which is a structural diagram of a cell connection device provided by an embodiment of the present application. The device is applied to a target node. As shown in Figure 5, the cell connection device 500 includes:

Response module 501, used to respond to the connection establishment process initiated by the terminal through the target cell;

Optionally, the device further includes a receiving module for:

When the terminal initiates a first connection reestablishment process based on handover assistance information, receive first indication information sent by the terminal, where the first indication information is used to indicate the reason for connection reestablishment between the terminal and the target cell;

When the terminal initiates a random access process based on handover assistance information, receive second indication information sent by the terminal, where the second indication information is used to indicate the terminal identification and source service of the source serving cell of the terminal. At least one of the cell identifiers of the cell.

Optionally, in the case where the terminal initiates the first connection reestablishment process based on the handover assistance information, the device further includes a sending module, configured to:

If the target node does not have the context of the terminal, a first request is sent to the source node of the terminal, where the first request is used to request to extract the context of the terminal.

Optionally, the first request also includes at least one of the following:

Reason information for requesting extraction of the context of the terminal.

Optionally, the context identification information includes the terminal identification of the terminal in the source serving cell and the location of the source serving cell. At least one of the cell identifiers of the district.

Handover based on handover auxiliary information;

Switching based on broadcast or multicast;

The source serving cell has stopped serving or will stop serving.

Optionally, if the target node does not have the context of the terminal, the sending module is further configured to:

If the target node does not have the context of the terminal, send a first request to the source node of the terminal based on the second indication information.

Optionally, the sending module is also used to:

When the device successfully obtains the context of the terminal, a first connection reestablishment response message is sent to the terminal, where the first connection reestablishment response message is used to indicate that the first connection reestablishment is successful.

Optionally, when receiving the second indication information sent by the terminal, the sending module is also configured to:

Send third indication information to the terminal, where the third indication information is used to indicate that the random access process is successful.

Optionally, the sending module is also used to:

If the first connection is successfully reestablished or the random access is successful, a reconfiguration message is sent to the terminal, where the reconfiguration message is used to update the security parameters of the terminal at the target node.

In this embodiment of the present application, the device can respond to a connection establishment process initiated by the terminal through the target cell. The connection establishment process is initiated by the terminal based on handover assistance information provided by the source node. Multiple terminals may simultaneously initiate a connection establishment process with the target node based on the handover assistance information provided by the source node. That is, the device may respond to the connection establishment process sent by multiple terminals to save system signaling overhead.

It should be noted that the cell connection device provided by the embodiment of the present application can implement each process implemented by the method embodiment in Figure 3 and achieve the same technical effect. To avoid duplication, the details will not be described here.

Optionally, as shown in Figure 6, this embodiment of the present application also provides a communication device 600, which includes a processor 601 and a memory 602. The memory 602 stores programs or instructions that can be run on the processor 601, for example. , when the communication device 600 is a terminal, when the program or instruction is executed by the processor 601, each step of the method embodiment described in Figure 2 is implemented, and the same technical effect can be achieved. When the communication device 600 is the target node, when the program or instruction is executed by the processor 601, each step of the method embodiment described in Figure 3 is implemented, and the same technical effect can be achieved. To avoid duplication, the details will not be described here.

Embodiments of the present application also provide a terminal, including a processor and a communication interface. The communication interface is used to receive handover assistance information provided by a source node, where the handover assistance information includes configuration information of a target cell; the processor is used to receive handover assistance information based on The handover assistance information establishes a connection with the target cell. This terminal embodiment corresponds to the above-mentioned terminal-side method embodiment. Each implementation process and implementation manner of the above-mentioned method embodiment can be applied to this terminal embodiment, and can achieve the same technical effect. Specifically, FIG. 7 is a schematic diagram of the hardware structure of a terminal that implements an embodiment of the present application.

The terminal 700 includes but is not limited to: a radio frequency unit 701, a network module 702, an audio output unit 703, an input unit 704, a sensor 705, a display unit 706, a user input unit 707, an interface unit 708, a memory 709 and and at least some components of the processor 710 and the like.

Those skilled in the art can understand that the terminal 700 may also include a power supply (such as a battery) that supplies power to various components. The power supply may be logically connected to the processor 710 through a power management system, thereby managing charging, discharging, and power consumption through the power management system. Management and other functions. The terminal structure shown in FIG. 7 does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or some components may be combined or arranged differently, which will not be described again here.

It should be understood that in the embodiment of the present application, the input unit 704 may include a graphics processing unit (Graphics Processing Unit, GPU) 7041 and a microphone 7042. The graphics processor 7041 is responsible for the image capture device (GPU) in the video capture mode or the image capture mode. Process the image data of still pictures or videos obtained by cameras (such as cameras). The display unit 706 may include a display panel 7061, which may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 707 includes a touch panel 7071 and at least one of other input devices 7072 . Touch panel 7071, also called touch screen. The touch panel 7071 may include two parts: a touch detection device and a touch controller. Other input devices 7072 may include but are not limited to physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be described again here.

In this embodiment of the present application, after receiving downlink data from the network side device, the radio frequency unit 701 can transmit it to the processor 710 for processing; in addition, the radio frequency unit 701 can send uplink data to the network side device. Generally, the radio frequency unit 701 includes, but is not limited to, an antenna, amplifier, transceiver, coupler, low noise amplifier, duplexer, etc.

Memory 709 may be used to store software programs or instructions as well as various data. The memory 709 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instructions required for at least one function (such as a sound playback function, Image playback function, etc.) etc. Additionally, memory 709 may include volatile memory or non-volatile memory, or memory 709 may include both volatile and non-volatile memory. Among them, non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically removable memory. Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. Volatile memory can be random access memory (Random Access Memory, RAM), static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDRSDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (Synch link DRAM) , SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DRRAM). Memory 709 in embodiments of the present application includes, but is not limited to, these and any other suitable types of memory.

The processor 710 may include one or more processing units; optionally, the processor 710 integrates an application processor and a modem processor, where the application processor mainly handles operations related to the operating system, user interface, application programs, etc., Modem processors mainly process wireless communication signals, such as baseband processors. It can be understood that the above-mentioned modem processor may not be integrated into the processor 710.

Among them, the radio frequency unit 701 is used to receive handover auxiliary information provided by the source node, where the handover auxiliary information includes Configuration information of the target cell;

Processor 710, configured to establish a connection with the target cell based on the handover assistance information.

In the embodiment of the present application, the source node provides target cell configuration information to terminals accessing the source node through switching auxiliary information, so that multiple terminals accessing the source node can determine the target cell based on the target cell configuration information, and then access the source node. The terminal entering the source node can then switch to the target cell based on the handover assistance information. In this way, the source node effectively saves system signaling overhead by sending handover auxiliary information to multiple terminals that establish connections with it.

The terminal 700 provided by the embodiment of the present application can implement the entire process of the method embodiment described in Figure 2 and can achieve the same technical effect. To avoid duplication, the details will not be described here.

Embodiments of the present application also provide a network side device. The network side device is a target node and includes a processor and a communication interface. The processor is used to respond to a connection establishment process initiated by the terminal through the target cell; the connection establishment process is The terminal initiates based on handover assistance information provided by a source node of the terminal, where the handover assistance information includes target cell configuration information, and the target cell belongs to the target node. This network-side device embodiment corresponds to the above-mentioned method embodiment described in 3. Each implementation process and implementation manner of the above-mentioned method embodiment can be applied to this network-side device embodiment, and can achieve the same technical effect.

Specifically, the embodiment of the present application also provides a network side device. As shown in FIG. 8 , the network side device 800 includes: an antenna 81 , a radio frequency device 82 , a baseband device 83 , a processor 84 and a memory 85 . The antenna 81 is connected to the radio frequency device 82 . In the uplink direction, the radio frequency device 82 receives information through the antenna 81 and sends the received information to the baseband device 83 for processing. In the downlink direction, the baseband device 83 processes the information to be sent and sends it to the radio frequency device 82. The radio frequency device 82 processes the received information and then sends it out through the antenna 81.

The method performed by the network side device in the above embodiment can be implemented in the baseband device 83, which includes a baseband processor.

The baseband device 83 may include, for example, at least one baseband board on which multiple chips are disposed, as shown in FIG. Program to perform the network device operations shown in the above method embodiments.

The network side device may also include a network interface 86, which is, for example, a common public radio interface (CPRI).

Specifically, the network side device 800 in this embodiment of the present invention also includes: instructions or programs stored in the memory 85 and executable on the processor 84. The processor 84 calls the instructions or programs in the memory 85 to execute the various operations shown in Figure 5. The method of module execution and achieving the same technical effect will not be described in detail here to avoid duplication.

Embodiments of the present application also provide a readable storage medium. Programs or instructions are stored on the readable storage medium. When the program or instructions are executed by a processor, each process of the method embodiment described in Figure 2 is implemented, or Each process of the method embodiment described in Figure 3 above can achieve the same technical effect. To avoid repetition, it will not be described again here.

Wherein, the processor is the processor in the terminal described in the above embodiment. The readable storage medium may be non-volatile or non-transient. Readable storage media may include computer-readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disks or optical disks.

An embodiment of the present application further provides a chip. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the method described in Figure 2. Each process of the example, or each process of implementing the method embodiment described in Figure 3 above, and can achieve the same technical effect, will not be described again here to avoid repetition.

It should be understood that the chips mentioned in the embodiments of this application may also be called system-on-chip, system-on-a-chip, system-on-chip or system-on-chip, etc.

Embodiments of the present application further provide a computer program/program product. The computer program/program product is stored in a storage medium. The computer program/program product is executed by at least one processor to implement the method described in Figure 2 above. Each process of the embodiment, or each process of implementing the above method embodiment described in Figure 3, can achieve the same technical effect. To avoid repetition, it will not be described again here.

Embodiments of the present application also provide a communication system, including: a terminal and a network side device. The terminal can be used to perform the steps of the method as shown in Figure 2. The network side device can be used to perform the steps of the method as shown in Figure 3 above. Method steps.

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

Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is better. implementation. Based on this understanding, the technical solution of the present application can be embodied in the form of a computer software product that is essentially or contributes to related technologies. The computer software product is stored in a storage medium (such as ROM/RAM, disk, CD), including several instructions to cause a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in various embodiments of this application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Inspired by this application, many forms can be made without departing from the purpose of this application and the scope protected by the claims, all of which fall within the protection of this application.

Claims

A cell connection method, including:

The terminal receives handover assistance information provided by the source node, where the handover assistance information includes configuration information of the target cell;

The terminal establishes a connection with the target cell based on the handover assistance information.
The method according to claim 1, wherein the handover assistance information is provided through broadcast or multicast.
The method according to claim 1, wherein the handover assistance information further includes a time trigger event, and the time trigger event is used to indicate the timing for the terminal to establish a connection with the target cell.
The method according to claim 1 or 3, wherein the terminal establishing a connection with the target cell based on the handover assistance information includes:

When the first condition is met, the terminal establishes a connection with the target cell;

Wherein, the first condition includes any one of the following:

Receive a handover instruction sent by the source node; wherein the handover instruction is used to instruct the terminal to establish a connection with the target cell;

The time trigger event has been met.
The method of claim 4, wherein the handover indication is scheduled through a group identity.
The method according to claim 5, wherein the group identifier is a dedicated scheduling identifier used to instruct the terminal to perform cell switching based on handover assistance information.
The method according to claim 1, wherein the terminal establishing a connection with the target cell based on the handover assistance information includes at least one of the following:

The terminal initiates a first connection reestablishment process with the target cell based on the handover assistance information;

The terminal initiates a random access process with the target cell based on the handover assistance information.
The method of claim 7, further comprising:

When the terminal initiates the first connection reestablishment process with the target cell, the terminal sends first indication information to the target node, and the first indication information is used to indicate the reason for the connection reestablishment between the terminal and the target cell;

When the terminal initiates a random access process with the target cell, the terminal sends second indication information to the target node. The second indication information is used to indicate the terminal identification and source of the source serving cell. At least one of the cell identifiers of the serving cell;

Wherein, the target node is a network node to which the target cell belongs.
The method according to claim 8, wherein the reason for the connection reestablishment includes at least one of the following:

Handover based on handover auxiliary information;

Switching based on broadcast or multicast;

The source serving cell has stopped serving or will stop serving.
The method according to claim 8, wherein the terminal initiates a first connection reestablishment with the target cell. In the case of process, the method also includes:

The terminal starts a first timer; wherein the first timer is used to determine whether the first connection reestablishment between the terminal and the target node is successful.
The method according to claim 10, wherein the method further includes one or more of the following:

When the first timer times out, the first connection reestablishment process between the terminal and the target node fails;

In the event that the first timer times out, the terminal initiates a second connection reestablishment process with the target node;

If the first connection between the terminal and the target node is successfully reestablished, the terminal stops the first timer.
The method according to claim 8, wherein when the terminal sends the second indication information to the target node, the method further includes:

The terminal receives third indication information sent by the target node, where the third indication information is used to indicate that the random access process is successful.
The method according to claim 12, wherein the third indication information includes at least one of a terminal identification of the terminal in a source serving cell and a source serving cell identification.
The method of claim 8, further comprising:

When the first connection is reestablished successfully or the random access is successful, the terminal receives a reconfiguration message sent by the target node, and the reconfiguration message is used to update the terminal's configuration on the target node. security parameters.
The method according to claim 1, wherein the process of the terminal establishing a connection with the target cell based on handover assistance information includes:

In the case where the handover assistance information includes configuration information of multiple target cells, the terminal selects the first target cell based on the area information associated with the target cell and the location information of the terminal;

The terminal establishes a connection with the first target cell based on the configuration information of the first target cell.
The method of claim 15, wherein the terminal selects the first target cell based on area information associated with the target cell and location information of the terminal, including:

When the location of the terminal is within the coverage represented by the first area information, the terminal uses the target cell associated with the first area information as the first target cell.
A cell connection method, including:

The target node responds to the connection establishment process initiated by the terminal through the target cell;

Wherein, the connection establishment process is initiated by the terminal based on handover auxiliary information provided by a source node of the terminal, where the handover auxiliary information includes target cell configuration information, and the target cell belongs to the target node.
The method according to claim 17, wherein the connection establishment process includes at least one of the following:

The first connection reestablishment process initiated by the terminal based on the handover assistance information;

The terminal initiates a random access process based on handover assistance information.
The method of claim 18, wherein the method further includes:

When the terminal initiates a first connection reestablishment process based on handover assistance information, the target node receives the first indication information sent by the terminal, and the first indication information is used to instruct the terminal to reestablish a connection with the target cell. s reason;

When the terminal initiates a random access process based on handover assistance information, the target node receives the second indication information sent by the terminal, and the second indication information is used to indicate that the terminal is in the source serving cell. At least one of the identification and the cell identification of the source serving cell.
The method according to claim 19, wherein in the case where the terminal initiates a first connection reestablishment process based on handover assistance information, the method further includes:

If the target node does not have the context of the terminal, the target node sends a first request to the source node of the terminal, where the first request is used to request to extract the context of the terminal.
The method according to claim 20, wherein the first request further includes at least one of the following:

Context identification information of the terminal that initiated the first connection reestablishment process;

Reason information for requesting extraction of the context of the terminal.
The method according to claim 21, wherein the context identification information includes at least one of a terminal identification of the terminal in a source serving cell and a cell identification of the source serving cell.
The method according to claim 22, wherein the reason information for requesting to extract the context of the terminal includes at least one of the following:

Handover based on handover auxiliary information;

Switching based on broadcast or multicast;

The source serving cell has stopped serving or will stop serving.
The method according to claim 20, wherein if the target node does not have the context of the terminal, the target node sends a first request to the source node of the terminal, including:

If the target node does not have the context of the terminal, the target node sends a first request to the source node of the terminal based on the second indication information.
The method of claim 20, wherein the method further includes:

When the target node successfully obtains the context of the terminal, the target node sends a first connection reestablishment response message to the terminal, and the first connection reestablishment response message is used to indicate the first connection reestablishment. success.
The method according to claim 19 or 20 or 24, wherein in the case where the target node receives the second indication information sent by the terminal, the method further includes:

The target node sends third indication information to the terminal, where the third indication information is used to indicate that the random access process is successful.
The method according to claim 18 or 25, wherein the method further includes:

When the first connection is reestablished successfully or the random access is successful, the target node sends a reconfiguration message to the terminal, and the reconfiguration message is used to update the security of the terminal at the target node. parameter.
A cell connection device, including:

A receiving module, configured to receive handover assistance information provided by the source node, where the handover assistance information includes configuration information of the target cell;

A connection module, configured to establish a connection with the target cell based on the handover assistance information.
A cell connection device, applied to a target node, the device includes:

A response module, used to respond to the connection establishment process initiated by the terminal through the target cell;

Wherein, the connection establishment process is initiated by the terminal based on handover assistance information provided by a source node of the terminal, where the handover assistance information includes target cell configuration information, and the target cell belongs to the target node.
A terminal, including a processor and a memory, the memory stores programs or instructions that can be run on the processor, and when the programs or instructions are executed by the processor, any one of claims 1-16 is implemented. The steps of the cell connection method.
A network side device. The network side device is a target node and includes a processor and a memory. The memory stores programs or instructions that can be run on the processor. When the program or instructions are executed by the processor The steps of implementing the cell connection method according to any one of claims 17-27.
A readable storage medium that stores programs or instructions that, when executed by a processor, implement the steps of the cell connection method according to any one of claims 1-16, or The steps of implementing the cell connection method according to any one of claims 17-27.