WO2020163996A1

WO2020163996A1 - Data forwarding method, device, and storage medium

Info

Publication number: WO2020163996A1
Application number: PCT/CN2019/074877
Authority: WO
Inventors: 唐海
Original assignee: Oppo广东移动通信有限公司
Priority date: 2019-02-12
Filing date: 2019-02-12
Publication date: 2020-08-20
Also published as: CN112970287A; CN112970287B

Abstract

Disclosed is a data forwarding method, comprising: a terminal device stores a handover command sent by a network device and information of a cell associated with the handover command; the handover command is a handover command that triggers a handover on the basis of a condition, and is used for instructing the terminal device to hand over from a first cell to a second cell; the information of the cell associated with the handover command is used for, after the terminal device hands over to the second cell, performing data forwarding for a first network device corresponding to the first cell served by the terminal device and a target network device corresponding to the second cell. Also disclosed are another data forwarding method, a device, and a storage medium.

Description

Data forwarding method, equipment and storage medium

Technical field

The present invention relates to the field of wireless communication technology, and in particular to a data forwarding method, equipment and storage medium.

Background technique

In the related art, for conditional handover (conditional handover), after the source network device sends a handover command to the terminal device, the terminal device needs to wait for the handover trigger condition to be met to perform the cell handover. When the terminal device meets the trigger condition and is switched to the target network device 1, the target network device 1 triggers the path switch to the core network and becomes the new serving cell of the terminal device. When the target network device 2 also meets the trigger condition, the terminal device can still initiate a cell handover. However, after the terminal device is switched to the target network device 2, the target network device 1 does not know that the terminal device has switched to the target network device 2. Therefore, the target network device 1 cannot actively initiate data forwarding; and, the target network device 1 and the target network device 1 The network device 2 has never established context information and signaling interaction about the terminal device. Therefore, the target network device 2 does not know which cell the terminal device is handed over to this cell, nor can it send a data forwarding request; this causes the terminal device to switch from When a cell is switched to another cell, the data can not be forwarded between cells.

Summary of the invention

In order to solve the foregoing technical problems, embodiments of the present invention provide a data forwarding method, device, and storage medium, which can ultimately enable end devices to implement data forwarding between cells when switching from one cell to another cell.

In a first aspect, an embodiment of the present invention provides a data forwarding method, including: a terminal device storing a handover command sent by a network device and information of a cell associated with the handover command;

The handover command is a handover command that triggers handover based on conditions, and is used to instruct the terminal device to switch from the first cell to the second cell; the information of the cell associated with the handover command is used for the terminal device When switching from the first cell to the second cell, the first network device corresponding to the first cell and the target network device corresponding to the second cell forward data.

In a second aspect, an embodiment of the present invention provides a data forwarding method, including: a target network device receives first information sent by a terminal device, where the first information is used to characterize related information of a first cell corresponding to the first network device;

The target network device forwards data with the first network device based on the first information; the first network device is the corresponding network device before the terminal device initiates cell handover, and the target network device is the terminal device The corresponding network equipment after the cell handover is initiated.

In a third aspect, an embodiment of the present invention provides a terminal device, including: a storage unit configured to store a handover command sent by a network device and information of a cell associated with the handover command;

In a fourth aspect, an embodiment of the present invention provides a target network device, where the target network device includes:

The second transceiving unit is configured to receive first information sent by a terminal device, the first information being used to characterize related information of the first cell corresponding to the first network device; and performing data with the first network device based on the first information Forward

The first network device is the corresponding network device before the terminal device initiates the cell handover, and the target network device is the corresponding network device after the terminal device initiates the cell handover.

In a fifth aspect, an embodiment of the present invention provides a terminal device, including a processor and a memory for storing a computer program that can run on the processor, wherein the processor is used to execute the above-mentioned terminal when the computer program is running. The steps of the data forwarding method performed by the device.

In a sixth aspect, an embodiment of the present invention provides a storage medium that stores an executable program, and when the executable program is executed by a processor, it implements the data forwarding method executed by the target network device.

The data forwarding method provided by the embodiment of the present invention includes: a terminal device stores a handover command sent by a source network device and information of a cell associated with the handover command; and when a handover is initiated from a first cell to a second cell, the terminal device The target network device corresponding to the second cell sends the identification information of the first cell and the identification information of the terminal device in the first cell. This enables the target network device to learn the identification information of the first cell and the identification information of the terminal device in the first cell when the terminal device continuously undergoes cell switching. In this way, the target network device can learn which cell the terminal device is handed over from, and implement the first network corresponding to the first cell based on the identification information of the first cell and the identification information of the terminal device in the first cell The data forwarding between the device and the target network device reduces the time delay of handover terminal equipment; and there is no need to renew the handover command for each target cell, saving signaling overhead.

Description of the drawings

Figure 1 is a schematic diagram of the cell handover process of the present invention;

Figure 2 is a schematic diagram of the conditional handover process of the present invention;

3 is a schematic diagram of the terminal device switching to the target network device in the conditional handover of the present invention;

4 is a schematic diagram of the composition structure of a communication system according to an embodiment of the present invention;

5 is a schematic diagram of an optional processing flow of a data forwarding method applied to a terminal device according to an embodiment of the present invention;

Fig. 6 is a schematic diagram of a data forwarding process in a conditional handover according to the present invention;

FIG. 7 is a schematic diagram of an optional processing flow of a data forwarding method applied to a target network device according to the present invention;

8 is a schematic diagram of the composition structure of a terminal device according to an embodiment of the present invention;

9 is a schematic diagram of the composition structure of a target network device according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of the hardware composition structure of an electronic device according to an embodiment of the present invention.

detailed description

In order to understand the features and technical content of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The attached drawings are for reference and explanation purposes only, and are not used to limit the embodiments of the present invention.

Before describing in detail the data forwarding method provided by the embodiment of the present invention, a brief description of the cell handover process in the related art and the data forwarding method after the cell handover will be briefly described.

At present, with people's pursuit of speed, delay, high-speed mobility, energy efficiency, and the diversity and complexity of services in future life, the 3GPP International Standards Organization has begun to develop 5G. The main application scenarios of 5G are: Enhance Mobile Broadband (eMBB), Ultra Reliable Low Latency Communications (URLLC), and Massive Machine Type Communication (mMTC).

eMBB still aims for users to obtain multimedia content, services and data, and its demand is growing rapidly. On the other hand, because eMBB may be deployed in different scenarios, such as indoors, urban areas, rural areas, etc., its capabilities and requirements are also quite different, so it cannot be generalized and must be analyzed in detail in conjunction with specific deployment scenarios. Typical applications of URLLC include: industrial automation, power automation, telemedicine operations (surgery), traffic safety protection, etc. Typical features of mMTC include: high connection density, small data volume, delay-insensitive services, low-cost modules and long service life.

Similar to the LTE system, the New Rational (NR) system supports the handover process of connected terminal devices. When a terminal device that is using network services moves from one cell to another, or due to wireless transmission service load adjustment, activation operation and maintenance, equipment failure, etc., in order to ensure communication continuity and service quality, the system must The communication link between the terminal equipment and the original cell is transferred to the new cell, that is, the handover process is performed.

Taking the Xn interface handover process as an example, the cell handover process, as shown in Figure 1, is divided into the following three stages:

Phase 1 (including steps 1 to 5), handover preparation: including measurement control and reporting, handover request and confirmation

Phase 2 (including steps 6 to 8), handover execution: the terminal device immediately executes the handover process after receiving the handover command, that is, the terminal device disconnects the source cell and connects to the target cell (such as performing random access, sends an RRC handover complete message to Target network equipment, etc.); secondary node (Secondary Node, SN) state transfer, data forwarding.

Phase 3 (including steps 9 to 12), the handover is completed: the target cell and the (Acess and Mobility Management Function, AMF) and the user plane function (User Port Function, UPF) execute the path switch (Path Switch), and release the terminal of the source network device Device context.

In terms of network implementation, the source network device can initiate handover preparation or request messages for multiple target cells simultaneously or sequentially according to the measurement report of the terminal device (including measurement results of multiple cells); specifically, the source network device can be based on direct connection Or through the S1/N2 interface between the mobility management entity (Mobility Management Entity, MME)/AMF to initiate a handover preparation or request message. After receiving the handover preparation/request message, each target cell performs access control according to its own RRM algorithm, and sends a handover request response message to the network device where the source cell is located under the premise of passing the access control (if the access control fails) Then respond to the handover request failure message), which carries the handover command generated by the target cell. The source network device selects one of the multiple target cells that return a handover response according to its own RRM algorithm as the final handover target cell, and sends the handover command corresponding to the target cell to the terminal device through the RRC reconfiguration message to realize the network The device has complete control over the switching process.

The handover process triggered by the measurement report of the terminal equipment is mainly the management of the mobile connection of the terminal equipment by the network equipment, so that the terminal equipment maintains the continuity of the current transmission service when it moves to the cell boundary and enters a new cell. Unlike this handover trigger condition, LTE and NR systems also support a blind handover process. One of the trigger conditions for blind handover is based on the load balancing considerations on the network side. For example, when the current serving cell is congested, the serving cell can switch one or more connected terminal devices to other cells with lower load, even if these terminals The device has not really moved to the cell boundary. The existing X2 and Xn interfaces already support the exchange of load information of respective cells between different base stations, so that the serving cell can obtain the load status of other neighboring cells and decide whether to perform blind handover to some terminal devices according to their respective load comparisons.

For high-speed mobile scenarios and high-frequency deployment scenarios, there are frequent handovers and handover problems that are prone to failure. 3GPP is currently discussing the introduction of conditional handover for LTE and NR systems. The conditional handover process is shown in Figure 2. According to the conditions configured by the network equipment, the terminal device executes the handover to the target cell according to the pre-configured handover command (that is, triggers the random access process) when it is triggered by the conditions related to the target cell. And send a handover complete message) to avoid the problem of too late or unable to send measurement reports and receive handover commands due to high-speed movement into the poor coverage area.

In conditional handover, after the source network device issues a handover command, the terminal device does not execute the handover immediately but waits for the handover trigger condition to be met before executing it. As shown in Figure 3, when the network device meets the trigger condition and switches to a target network device (for example, target network device 1 in Figure 3), the target network device triggers path switch to the core network and becomes the new serving cell of the terminal device. After that, if another target network device (for example, target network device 2 in Figure 3) meets the handover trigger condition corresponding to the handover command issued by the previous source network device, the terminal device can still initiate the handover. However, based on the following data Forwarding could not be completed:

1. A conditional handover is a handover triggered by a terminal device. The target network device 1 does not know that the terminal device has switched to the target network device 2, so the target network device 1 cannot actively initiate data forwarding;

2. The X2/Xn signaling interaction is established between the target network device 2 and the same source network device. Since the path has been transferred to the target network device 1 after the path switch, the source network device no longer receives data from the core network;

3. The target network device 2 and target network device 1 have not established any X2/Xn context information and signaling interaction about the terminal device, and the target network device 2 does not know from which cell the terminal device is handed over to this cell, and cannot Make a data forwarding request.

Based on the above problems, the present invention provides a data forwarding method. The data forwarding method in the embodiments of this application can be applied to various communication systems, such as: Global System of Mobile Communication (GSM) system, Code Division Multiple Access (GSM) system Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (Frequency Division Duplex, FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access, WiMAX) communication system or 5G system, etc.

Exemplarily, the communication system 100 applied in the embodiment of the present application is shown in FIG. 4. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal device 120 (or called a communication terminal or terminal). The network device 110 may provide communication coverage for a specific geographic area, and may communicate with terminal devices located in the coverage area. Optionally, the network device 110 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, a base station (NodeB, NB) in a WCDMA system, or an evolved base station in an LTE system (Evolutional Node B, eNB or eNodeB), or the wireless controller in the Cloud Radio Access Network (CRAN), or the network equipment can be a mobile switching center, a relay station, an access point, a vehicle-mounted device, Wearable devices, hubs, switches, bridges, routers, network-side devices in 5G networks, or network devices in the future evolution of the Public Land Mobile Network (PLMN), etc.

The communication system 100 also includes at least one terminal device 120 located within the coverage area of the network device 110. The "terminal equipment" used here includes but is not limited to connection via wired lines, such as via public switched telephone networks (PSTN), digital subscriber lines (Digital Subscriber Line, DSL), digital cables, and direct cable connections ; And/or another data connection/network; and/or via a wireless interface, such as for cellular networks, wireless local area networks (WLAN), digital TV networks such as DVB-H networks, satellite networks, AM- FM broadcast transmitter; and/or another terminal device that is set to receive/send communication signals; and/or Internet of Things (IoT) equipment. A terminal device set to communicate through a wireless interface may be referred to as a "wireless communication terminal", a "wireless terminal" or a "mobile terminal". Examples of mobile terminals include, but are not limited to, satellites or cellular phones; Personal Communications System (PCS) terminals that can combine cellular radio phones with data processing, fax, and data communication capabilities; can include radio phones, pagers, Internet/intranet PDA with internet access, web browser, memo pad, calendar, and/or Global Positioning System (GPS) receiver; and conventional laptop and/or palmtop receivers or others including radio phone transceivers Electronic device. Terminal equipment can refer to access terminals, user equipment (UE), user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile equipment, user terminals, terminals, wireless communication equipment, user agents, or User device. The access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital processing (Personal Digital Assistant, PDA), with wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in 5G networks, or terminal devices in the future evolution of PLMN, etc.

Optionally, direct terminal connection (Device to Device, D2D) communication may be performed between the terminal devices 120.

Optionally, the 5G system or 5G network may also be referred to as a New Radio (NR) system or NR network.

Figure 4 exemplarily shows one network device and two terminal devices. Optionally, the communication system 100 may include multiple network devices and the coverage of each network device may include other numbers of terminal devices. The embodiment does not limit this.

Optionally, the communication system 100 may also include other network entities such as a network controller and a mobility management entity, which are not limited in the embodiment of the present application.

It should be understood that the devices with communication functions in the network/system in the embodiments of the present application may be referred to as communication devices. Taking the communication system 100 shown in FIG. 4 as an example, the communication device may include a network device 110 and a terminal device 120 with communication functions, and the network device 110 and the terminal device 120 may be the specific devices described above, which will not be repeated here. The communication device may also include other devices in the communication system 100, such as other network entities such as a network controller and a mobility management entity, which are not limited in this embodiment of the application.

An optional processing flow of the data forwarding method applied to terminal equipment provided by the embodiment of the present invention, as shown in FIG. 5, includes the following steps:

Step S201: The terminal device stores the handover command sent by the network device and the information of the cell associated with the handover command.

In the embodiment of the present invention, the handover command is a handover command that triggers handover based on conditions, and is used to instruct the terminal device to switch from the first cell to the second cell; the information of the cell associated with the handover command, When the terminal device switches from the first cell to the second cell, the first network device corresponding to the first cell and the target network device corresponding to the second cell forward data. The cell associated with the handover command refers to a cell corresponding to the network device configured with the handover command. Optionally, the first network device is the network device that sends the handover command to the terminal device; or the first network device is the terminal device after a cell handover from the network device that sent the handover command to the terminal device The corresponding network device, that is, the first network device and the network device that sent the switching command to the terminal device are not the same network device; or the first network device is the terminal device that sends the switching command to the terminal device The corresponding network device after the network device performs multiple cell handovers.

Wherein, the handover command is a valid pre-handover command for at least one target network device; in specific implementation, a timer can be used to determine whether the handover command stored by the terminal device is valid. For example, the terminal device stores the switching command to start timing. When the timer expires, the terminal device confirms that the switching command is invalid; the timer does not expire, the terminal device confirms that the switching command is valid.

In some embodiments, the information of the cell associated with the handover command includes at least: identification information of the cell corresponding to the network device configuring the handover command. Wherein, the identification information of the cell includes at least one of the following: Physical Cell Identifier (PCI) and frequency; E-UTRAN Cell Global Identifier (E-UTRAN Cell Global) Identifier, ECGI); New Radio Cell Global Identifier (NCGI).

In the embodiment of the present invention, the handover command includes: a handover command for at least one target cell and a condition configuration related to the handover command for the at least one target cell; when the relevant conditions are met, the terminal device is based on the handover Command to initiate handover to the target cell. To satisfy the first condition among the related conditions as an example, the terminal device initiates handover to the second cell based on the first handover command in the stored handover commands. And after the random access is successful, the terminal device sends a handover complete message, such as an RRC reconfiguration complete message, to the target network device corresponding to the second cell.

In some embodiments, before the terminal device sends the handover complete message to the target network device, the terminal device determines whether the first cell is the same as the cell corresponding to the network device configured with the first handover command.

In a specific implementation, when the ECGI of the first cell is different from the ECGI of the cell corresponding to the network device configured with the first handover command, the terminal device confirms that the first cell is different from the ECGI configured with the first handover command. The district is different. Or, when the NCGI of the first cell is different from the NCGI of the cell corresponding to the network device configured with the first handover command, the terminal device confirms that the first cell corresponds to the network device configured with the first handover command The cell is different. Or, when the frequency of the first cell is different from the frequency of the cell corresponding to the network device configured with the first handover command, the terminal device confirms that the first cell is the same as the network configured with the first handover command The cell corresponding to the device is different. Or, when the PCI of the first cell is different from the PCI of the cell corresponding to the network device configured with the first handover command, the terminal device confirms that the first cell corresponds to the network device configured with the first handover command The cell is different.

Correspondingly, when the ECGI of the first cell is the same as the ECGI of the cell corresponding to the network device configured with the first handover command, the terminal device confirms that the first cell and the network configured with the first handover command The cell corresponding to the device is the same. Or, the NCGI of the first cell is the same as the NCGI of the cell corresponding to the network device configuring the first handover command, and the terminal device confirms that the first cell corresponds to the network device configuring the first handover command The cell is the same. Alternatively, the PCI of the first cell is the same as the PCI of the cell corresponding to the network device configured with the first handover command, and the frequency of the first cell is the same as that of the network configured with the first handover command When the frequency points of the cells corresponding to the devices are the same, the terminal device confirms that the first cell is the same as the cell corresponding to the network device configured with the first handover command.

If the first cell is the same as the cell configured with the first handover command, it indicates that the first cell and the cell corresponding to the network device configured with the first handover command are the same cell, and the first cell corresponds to the first network The handover preparation process has been carried out between the device and the target network device. If the X2/Xn interface has been established for the context information of the terminal device, the target cell only needs to send the FORWARDING ADDRESS INDICATION message with the same content as in the related technology to trigger the first A network device performs data forwarding (data forwarding)

If the first cell and the cell corresponding to the network device configured with the first handover command are different, that is, the second cell corresponding to the first cell and the target device has not established the X2/Xn interface and the context information about the terminal device, Methods also include:

Step S202: The terminal device sends first information to the target network device, where the first information is used to characterize related information of the first cell.

Optionally, the first information is carried in an RRC reconfiguration complete message, and the first information includes: identification information of the first cell and identification information of the terminal device in the first cell. The identification information of the terminal device in the first cell includes at least: the cell radio network temporary identifier (C-RNTI) of the terminal device. The identification information of the first cell includes at least one of the following: PCI and frequency; ECGI; NCGI.

In specific implementation, as shown in Figure 6, the target network device performs cell identity addressing according to the identity information of the first cell, and establishes X2/Xn interface context information about the terminal device between the first network device and the target network device , And trigger the first network device to forward data. For example, the target network device establishes the X2/Xn interface context information with the first cell during the context retrieve process. The context ID used is derived from the information of the first cell reported in the terminal device RRC reconfiguration complete message and the terminal device is in the first cell. Identification information in a cell. After the X2/Xn interface context information is established, the target network device can trigger the first cell to forward data by sending a FORWARDING ADDRESS INDICATION message.

In some embodiments, when the handover command stored in the terminal device is updated, the method further includes:

Step S203: The terminal device stores the updated handover command and the information of the cell associated with the updated handover command.

Here, the handover command update means that the handover command configuration is updated for a certain target cell; the handover command update can be performed by the network device that originally configured the handover command, or it can be a different one from the original configuration of the handover command. Network equipment is performed by different network equipment.

For the data forwarding method provided in the embodiment of the present invention, the relevant RRC protocol needs to be modified; take the RRC Reconfiguration Complete message in TS38.331 specification to report PCI, frequency and C-RNTI as examples:

RRC Reconfiguration Complete message

The optional processing flow of the data forwarding method applied to the target network device provided by the embodiment of the present invention, as shown in FIG. 7, includes:

Step S301: The target network device receives first information sent by the terminal device, where the first information is used to characterize related information of the first cell corresponding to the first network device.

In some embodiments, the first information is carried in an RRC reconfiguration complete message, and the first information includes: identification information of the first cell and identification information of the terminal device in the first cell . The identification information of the first cell includes at least one of the following: PCI and frequency; ECGI; and NCGI.

Step S302: The target network device forwards data with the first network device based on the first information.

Wherein, the first network device is a corresponding network device before the terminal device initiates a cell handover, and the target network device is a corresponding network device after the terminal device initiates a cell handover.

In further specific implementation, the target network device establishes context information with the first network device based on the identification information of the first cell and the identification information of the terminal device in the first cell; The network device sends a second message to the first network device, where the second message is used to trigger the first network device to forward data to the target network device.

In other embodiments, if the target network device does not receive the first information sent by the terminal device, the target network device does not need to establish context information with the first network device, but only needs to The first network device sends the second message.

Optionally, the second message is a data forwarding address indication DATA FORWARDING ADDRESS INDICATION message.

The embodiment of the present invention provides a terminal device. The composition structure of the terminal device 400, as shown in FIG. 8, includes:

The storage unit 401 is configured to store the handover command sent by the network device and the information of the cell associated with the handover command;

In some embodiments, the handover command is a valid pre-handover command for at least one target network device.

In some embodiments, the information of the cell associated with the handover command includes at least: identification information of the cell corresponding to the network device configuring the handover command.

In some embodiments, the identification information of the cell corresponding to the network device configuring the handover command includes at least one of the following: PCI and frequency; ECGI; and NCGI.

In some embodiments, the terminal device 400 further includes a processing unit 402 configured to initiate handover to the second cell based on the first handover command in the handover command when the first condition is met.

In some embodiments, when the first cell and the cell corresponding to the network device configuring the first handover command are different, the terminal device 400 further includes:

The first transceiver unit 403 is configured to send first information to the target network device, where the first information is used to characterize related information of the first cell.

In some embodiments, the difference between the cell corresponding to the first cell and the network device configuring the first handover command includes: the ECGI of the first cell and the network device configuring the first handover command The ECGI of the corresponding cell is different; or, the NCGI of the first cell is different from the NCGI of the cell corresponding to the network device configuring the first handover command; or, the frequency of the first cell is different from the configuration The frequency points of the cell corresponding to the network device of the first handover command are different; or the PCI of the first cell is different from the PCI of the cell corresponding to the network device configured with the first handover command.

In some embodiments, the first information includes: identification information of the first cell and identification information of the terminal device in the first cell.

In some embodiments, the identification information of the terminal device in the first cell includes at least: the C-RNTI of the terminal device.

In some embodiments, the identification information of the first cell includes at least one of the following: PCI and frequency; ECGI; and NCGI.

In some embodiments, the first information is carried in an RRC reconfiguration complete message.

In some embodiments, the storage unit 401 is further configured to store the updated handover command and the information of the cell associated with the updated handover command when the handover command is updated.

In some embodiments, the handover command includes: a handover command for at least one target cell and a condition configuration related to the handover command for the at least one target cell; when the relevant condition is met, the terminal device is based on the handover command. Command to initiate handover to the target cell.

The embodiment of the present invention also provides a target network device. The composition structure of the target network device 500, as shown in FIG. 9, includes:

The second transceiving unit 501 is configured to receive first information sent by a terminal device, where the first information is used to characterize related information of the first cell corresponding to the first network device; based on the first information and the first network device Data forwarding

In some embodiments, the second transceiver unit 501 is configured to establish a connection with the first network device based on the identification information of the first cell and the identification information of the terminal device in the first cell. Context information.

In some embodiments, the second transceiver unit 501 is further configured to send a second message to the first network device when the first information sent by the terminal device is not received, and the second message is used for Trigger the first network device to forward data to the target network device.

In some embodiments, the second message is a DATA FORWARDING ADDRESS INDICATION message.

In the embodiment of the present invention, since the terminal device can simultaneously obtain the handover command of multiple target cells and the information of the cell corresponding to the network device configured with the handover command, the terminal device can continuously switch cells (such as the terminal device switches to the first After the cell is switched to the second cell), the target network device corresponding to the second cell can learn the identification information of the first cell and the identification information of the terminal device in the first cell. In this way, the target network device can learn which cell the terminal device is handed over from, and implement the first network corresponding to the first cell based on the identification information of the first cell and the identification information of the terminal device in the first cell The data forwarding between the device and the target network device reduces the time delay of handover terminal equipment; and there is no need to renew the handover command for each target cell, saving signaling overhead.

An embodiment of the present invention also provides a terminal device, including a processor and a memory for storing a computer program that can run on the processor, where the processor is used to execute the above-mentioned terminal device when the computer program is running. The steps of the data forwarding method.

The embodiment of the present invention also provides a target network device, which includes a processor and a memory for storing a computer program that can run on the processor, wherein the processor is used to execute the target network device when the computer program is running. Perform the steps of the data forwarding method.

FIG. 10 is a schematic diagram of the hardware composition structure of an electronic device (terminal device and target network device) according to an embodiment of the present invention. The terminal device 700 includes: at least one processor 701, a memory 702, and at least one network interface 704. The various components in the terminal device 700 are coupled together through the bus system 705. It can be understood that the bus system 705 is used to implement connection and communication between these components. In addition to the data bus, the bus system 705 also includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are marked as the bus system 705 in FIG. 10.

It is understood that the memory 702 may be a volatile memory or a non-volatile memory, and may also include both volatile and non-volatile memory. Among them, the non-volatile memory can be ROM, Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), and electrically erasable Programmable read-only memory (EEPROM, Electrically Erasable Programmable Read-Only Memory), magnetic random access memory (FRAM, ferromagnetic random access memory), flash memory (Flash Memory), magnetic surface memory, optical disk, or CD-ROM (CD) -ROM, Compact Disc Read-Only Memory); Magnetic surface memory can be disk storage or tape storage. The volatile memory may be random access memory (RAM, Random Access Memory), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (SRAM, Static Random Access Memory), synchronous static random access memory (SSRAM, Synchronous Static Random Access Memory), and dynamic random access Memory (DRAM, Dynamic Random Access Memory), synchronous dynamic random access memory (SDRAM, Synchronous Dynamic Random Access Memory), double data rate synchronous dynamic random access memory (DDRSDRAM, Double Data Rate Synchronous Dynamic Random Access Memory), enhanced -Type synchronous dynamic random access memory (ESDRAM, Enhanced Synchronous Dynamic Random Access Memory), synchronous connection dynamic random access memory (SLDRAM, SyncLink Dynamic Random Access Memory), direct memory bus random access memory (DRRAM, Direct Rambus Random Access Memory) ). The memory 702 described in the embodiment of the present invention is intended to include, but is not limited to, these and any other suitable types of memory.

The memory 702 in the embodiment of the present invention is used to store various types of data to support the operation of the terminal device 700. Examples of these data include: any computer program used to operate on the terminal device 700, such as the application program 7022. The program for implementing the method of the embodiment of the present invention may be included in the application program 7022.

The method disclosed in the foregoing embodiment of the present invention may be applied to the processor 701 or implemented by the processor 701. The processor 701 may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the foregoing method can be completed by hardware integrated logic circuits in the processor 701 or instructions in the form of software. The aforementioned processor 701 may be a general-purpose processor, a digital signal processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and the like. The processor 701 may implement or execute various methods, steps, and logical block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present invention can be directly embodied as being executed and completed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium, and the storage medium is located in the memory 702. The processor 701 reads the information in the memory 702 and completes the steps of the foregoing method in combination with its hardware.

In an exemplary embodiment, the terminal device 700 may be used by one or more application specific integrated circuits (ASIC, Application Specific Integrated Circuit), DSP, programmable logic device (PLD, Programmable Logic Device), and complex programmable logic device (CPLD). , Complex Programmable Logic Device), FPGA, general-purpose processor, controller, MCU, MPU, or other electronic components to implement the foregoing method.

The embodiment of the present application also provides a storage medium for storing computer programs.

Optionally, the storage medium can be applied to the terminal device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process in each method of the embodiment of the present application. For brevity, details are not repeated here.

The present invention is described with reference to flowcharts and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing equipment to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment are generated It is a device that realizes the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device. The device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment. The instructions provide steps for implementing functions specified in a flow or multiple flows in the flowchart and/or a block or multiple blocks in the block diagram.

The above are only the preferred embodiments of the present invention and are not used to limit the scope of protection of the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in Within the protection scope of the present invention.

Claims

A data forwarding method, the method includes:

The terminal device stores the handover command sent by the network device and the information of the cell associated with the handover command;

The handover command is a handover command that triggers a conditional handover based on a condition, and is used to instruct the terminal device to switch from a first cell to a second cell; the cell information associated with the handover command is used for the When the terminal device switches from the first cell to the second cell, the first network device corresponding to the first cell and the target network device corresponding to the second cell perform data forwarding.
The method according to claim 1, wherein the handover command is a valid pre-handover command for at least one target network device.
The method according to claim 1 or 2, wherein the information of the cell associated with the handover command includes at least: identification information of the cell associated with the handover command.
The method according to claim 3, wherein the identification information of the cell associated with the handover command includes at least one of the following:

Physical cell identification PCI and frequency point;

Evolved universal land-based radio access network cell global identifier ECGI;

New radio cell global identifier NCGI.
The method according to any one of claims 1 to 4, wherein, when a first condition is satisfied, the terminal device initiates a handover to the second cell based on the first handover command in the handover command.
The method according to claim 5, wherein when the first cell and the cell corresponding to the network device configuring the first handover command are different, the method further comprises:

The terminal device sends first information to the target network device, where the first information is used to characterize related information of the first cell.
The method according to claim 6, wherein the difference between the first cell and the cell corresponding to the network device configuring the first handover command comprises:

The ECGI of the first cell is different from the ECGI of the cell corresponding to the network device configuring the first handover command.
The method according to claim 6, wherein the difference between the first cell and the cell corresponding to the network device configuring the first handover command comprises:

The NCGI of the first cell is different from the NCGI of the cell corresponding to the network device configuring the first handover command.
The method according to claim 6, wherein the difference between the first cell and the cell corresponding to the network device configuring the first handover command comprises:

The frequency of the first cell is different from the frequency of the cell corresponding to the network device configuring the first handover command.
The method according to claim 6, wherein the difference between the first cell and the cell corresponding to the network device configuring the first handover command comprises:

The PCI of the first cell is different from the PCI of the cell corresponding to the network device configured with the first handover command.
The method according to any one of claims 6 to 10, wherein the first information comprises: identification information of the first cell and identification information of the terminal device in the first cell.
The method according to claim 11, wherein the identification information of the terminal device in the first cell at least comprises:

The cell radio network temporary identification C-RNTI of the terminal device.
The method according to claim 11 or 12, wherein the identification information of the first cell includes at least one of the following:

PCI and frequency;

ECGI;

NCGI.
The method according to any one of claims 6 to 13, wherein the first information is carried in a radio resource control, RRC, reconfiguration complete message.
The method according to any one of claims 1 to 14, wherein when the handover command is updated, the method further comprises:

The terminal device stores the updated handover command and the information of the cell associated with the updated handover command.
The method according to any one of claims 1 to 15, wherein the handover command comprises: a handover command for at least one target cell and a condition configuration related to the handover command for the at least one target cell;

When the relevant conditions are met, the terminal device initiates handover to the target cell based on the handover command.
A data forwarding method, the method includes:

The target network device receives first information sent by the terminal device, where the first information is used to characterize related information of the first cell corresponding to the first network device;

The target network device forwards data with the first network device based on the first information; the first network device is the corresponding network device before the terminal device initiates cell handover, and the target network device is the terminal device The corresponding network equipment after the cell handover is initiated.
The method according to claim 17, wherein the first information comprises: identification information of the first cell and identification information of the terminal device in the first cell.
The method according to claim 18, wherein the identification information of the first cell comprises at least one of the following:

Physical cell identification PCI and frequency point;

Evolved universal land-based radio access network cell global identifier ECGI;

New radio cell global identifier NCGI.
The method according to any one of claims 17 to 19, wherein the first information is carried in a radio resource control, RRC, reconfiguration complete message.
The method according to any one of claims 18 to 20, wherein the target network device forwarding data with the first network device based on the first information comprises:

The target network device establishes context information with the first network device based on the identification information of the first cell and the identification information of the terminal device in the first cell;

The target network device sends a second message to the first network device, where the second message is used to trigger the first network device to forward data to the target network device.
The method according to any one of claims 17 to 21, wherein the method further comprises:

When the target network device does not receive the first information sent by the terminal device, the target network device sends a second message to the first network device, and the second message is used to trigger the first network device Data forwarding to the target network device.
The method according to claim 22, wherein the second message is a data forwarding address indication DATA FORWARDING ADDRESS INDICATION message.
A terminal device, the terminal device includes:

A storage unit configured to store the handover command sent by the source network device and the information of the cell associated with the handover command;

The handover command is a handover command that triggers a conditional handover based on a condition, and is used to instruct the terminal device to switch from a first cell to a second cell; the cell information associated with the handover command is used for the When the terminal device switches from the first cell to the second cell, the first network device corresponding to the first cell and the target network device corresponding to the second cell perform data forwarding.
The terminal device according to claim 24, wherein the handover command is a valid pre-handover command for at least one target network device.
The terminal device according to claim 24 or 25, wherein the information of the cell associated with the handover command includes at least: identification information of the cell associated with the handover command.
The terminal device according to claim 26, wherein the identification information of the cell associated with the handover command includes at least one of the following:

Physical cell identification PCI and frequency point;

Evolved universal land-based radio access network cell global identifier ECGI;

New radio cell global identifier NCGI.
The terminal device according to any one of claims 24 to 27, wherein the terminal device further comprises:

The processing unit is configured to initiate handover to the second cell based on the first handover command in the handover command when the first condition is met.
The terminal device according to claim 28, wherein when the first cell and the cell corresponding to the network device configuring the first handover command are different, the terminal device further comprises:

The first transceiver unit is configured to send first information to the target network device, where the first information is used to characterize related information of the first cell.
The terminal device according to claim 29, wherein the difference between the first cell and the cell corresponding to the network device configuring the first handover command comprises:

The ECGI of the first cell is different from the ECGI of the cell corresponding to the network device configuring the first handover command.
The terminal device according to claim 29, wherein the difference between the first cell and the cell corresponding to the network device configuring the first handover command comprises:

The NCGI of the first cell is different from the NCGI of the cell corresponding to the network device configuring the first handover command.
The terminal device according to claim 29, wherein the difference between the first cell and the cell corresponding to the network device configuring the first handover command comprises:

The frequency of the first cell is different from the frequency of the cell corresponding to the network device configuring the first handover command.
The terminal device according to claim 29, wherein the difference between the first cell and the cell corresponding to the network device configuring the first handover command comprises:

The PCI of the first cell is different from the PCI of the cell corresponding to the network device configured with the first handover command.
The terminal device according to any one of claims 29 to 33, wherein the first information comprises: identification information of the first cell and identification information of the terminal device in the first cell.
The terminal device according to claim 34, wherein the identification information of the terminal device in the first cell includes at least:

The cell radio network temporary identification C-RNTI of the terminal device.
The terminal device according to claim 34 or 35, wherein the identification information of the first cell includes at least one of the following:

PCI and frequency;

ECGI;

NCGI.
The terminal device according to any one of claims 29 to 36, wherein the first information is carried in a radio resource control, RRC, reconfiguration complete message.
The terminal device according to any one of claims 24 to 37, wherein the storage unit is further configured to store the updated handover command and the cell associated with the updated handover command when the handover command is updated Information.
The terminal device according to any one of claims 24 to 38, wherein the handover command comprises: a handover command for at least one target cell and a conditional configuration related to the handover command for the at least one target cell;

When the relevant conditions are met, the terminal device initiates handover to the target cell based on the handover command.
A target network device, the target network device includes:

The second transceiving unit is configured to receive first information sent by a terminal device, the first information being used to characterize related information of the first cell corresponding to the first network device; and performing data with the first network device based on the first information Forward

The first network device is the corresponding network device before the terminal device initiates the cell handover, and the target network device is the corresponding network device after the terminal device initiates the cell handover.
The target network device according to claim 40, wherein the first information comprises: identification information of the first cell and identification information of the terminal device in the first cell.
The target network device according to claim 41, wherein the identification information of the first cell includes at least one of the following:

Physical cell identification PCI and frequency point;

Evolved universal land-based radio access network cell global identifier ECGI;

New radio cell global identifier NCGI.
The target network device according to any one of claims 40 to 42, wherein the first information is carried in a radio resource control, RRC, reconfiguration complete message.
The target network device according to any one of claims 41 to 43, wherein the second transceiving unit is configured to be based on the identification information of the first cell and the identification of the terminal device in the first cell Information, establishing context information with the first network device.
The target network device according to any one of claims 40 to 44, wherein the second transceiver unit is further configured to send to the first network device when the first information sent by the terminal device is not received A second message, where the second message is used to trigger the first network device to forward data to the target network device.
The target network device according to claim 44 or 45, wherein the second message is a data forwarding address indication DATA FORWARDING ADDRESS INDICATION message.
A terminal device includes a processor and a memory for storing a computer program that can run on the processor, wherein:

When the processor is used to run the computer program, it executes the steps of the data forwarding method according to any one of claims 1 to 16.
A network device including a processor and a memory for storing a computer program that can run on the processor, wherein:

When the processor is used to run the computer program, it executes the steps of the data forwarding method according to any one of claims 17 to 23.
A storage medium storing an executable program, and when the executable program is executed by a processor, the data forwarding method according to any one of claims 1 to 16 is implemented.
A storage medium storing an executable program, and when the executable program is executed by a processor, the data forwarding method according to any one of claims 17 to 23 is realized.