JP2021052423A - Anchor handover method and device - Google Patents

Abstract

To provide an anchor handover method and device, which may ensure smooth handover of a terminal, reduce a handover latency and improve user experience during handover.SOLUTION: A target base station receives an anchor handover request message transmitted by a source base station and sends an anchor handover acknowledgement message to the source base station. Here, the source base station is a base station corresponding to a serving cell which currently provides service for a terminal and has a control and decision-making right, the target base station is a base station corresponding to a Secondary Cell which is controlled by the serving cell and currently provides service for the terminal, the anchor handover request message is to request to handover the control and decision-making right to the target base station, and the anchor handover acknowledgement message is to acknowledge the anchor handover request message.SELECTED DRAWING: Figure 1

Description

The present invention relates to the field of communication, and particularly to anchor handover methods and devices.

Currently, the wireless communication standardization mechanism is Long Term Evolution (LTE: Long).
A technique for reducing delays in the handover process of a Term Evolution) system is being discussed. In conventional LTE systems, the difficulty due to handover delays is primarily focused on the reconfiguration of terminals, source base stations and target base stations.

In the prior art, the handover delay includes a downlink synchronization delay, an uplink synchronization delay, and a reconstruction completion signaling delay on the target base station side after the terminal has completed the reconstruction. Here, since the important thing about downlink synchronization is the synchronization between the terminal and the target base station, if the target base station and the source base station are synchronized, the step may be ignored. The terminal processing delay is essential because the reconstruction completion delay is the same as the reconstruction signaling configuration delay. Therefore, the most important delay is the uplink synchronization delay.

Currently, uplink synchronization mainly involves several steps:

(1) The terminal executes a non-conflict random access flow according to the preamble information set in the reconstruction signaling.
(2) After receiving the Preamble information, the base station calculates the timing advance (TA: Timing Advance) of the uplink synchronization, and then calculates the timing advance (TA: Timing Advance).
(3) The base station notifies the terminal of the TA by a random access response (RAR: Random Access Response), allocates an uplink permission (UL grant) resource to the terminal, and assigns the terminal.
(4) The terminal transmits a reconstruction completion message using the TA set in the UL grant resource.

In the prior art, a specific optimization technique for the flow is as follows.

It is to use the soft handover method, that is, to change the behavior of the terminal of the current LTE system. When the terminal reconfigures, it does not reset entities such as media access control (MAC: Media Access Control), wireless link control (RLC: Radio Link Control), and packet data convergence protocol (PDCP: Packet Data Convergence Protocol). That is, the terminal always maintains a radio resource control (RRC: Radio Resource Control) connection with the source base station, and the terminal performs downlink synchronization and uplink synchronization with the target base station, transmits reconstruction signaling, and the terminal. Disconnects the RRC connection with the source base station only if it successfully connects to the target base station.

In the technical proposal, the timing advance is obtained by utilizing the technical proposal that the terminal measures and calculates in advance, that is, when the base station selects the target base station after the terminal completes and reports the measurement. , Set the resources corresponding to the terminal, allow the terminal to transmit uplink synchronization resources with the target base station, calculate the timing advance after the target base station receives the signaling, and transmit to the source cell. After receiving the timing advance, the source cell transmits a handover instruction including the timing advance to the terminal.

The proposed technology can eliminate the delay caused by establishing an RRC connection during the handover process, but support the terminal to maintain an RRC connection between the source and target base stations at the same time. The demand for the functions of the terminal is high, the complexity of the terminal is increasing, and the data transmission between the base station and the terminal is interrupted in the process of handover, so that the data transmission efficiency of the system is improved. Low and poor user experience.

An embodiment of the present invention provides an anchor handover method and device, can ensure that the terminal hands over smoothly, reduces the handover delay, and improves the user experience during the handover. ..

In the first direction, an anchor handover method is provided.
The target base station receives the anchor handover request message transmitted from the source base station, and
The target base station transmits an anchor handover confirmation message to the source base station, and
Here, the source base station is a base station corresponding to a service cell having a control decision right that currently provides a service to a terminal, and the target base station is controlled by the service cell. Currently, it is a base station corresponding to a secondary cell that provides a service to the terminal, and the anchor handover request message is used to request that the control decision right be switched to the target base station, and the anchor handover request message is used. The confirmation message is used to confirm the anchor handover request message.

Here, the anchor handover method in the present invention can be a part of the flow during the hand overflow of the base station. The handover of the anchor can complete the handover of the base station. Here, the anchor refers to a base station having the control decision right for the radio resource, and the handover of the anchor refers to the switching of the control decision right between the base stations.

Here, as the service cell of the source base station, the cell corresponding to the target base station can be added as a secondary cell by the multi-connection technology.

In one possible embodiment in the first direction, the method is
The target base station establishes a radio resource control (RRC) connection control link with the terminal.
The target base station sends an inactive message to the terminal,
The inactive message is used to instruct the source base station to be inactive.

In one possible embodiment of the first direction, after the target base station has transmitted an anchor handover confirmation message to the source base station, the method:
The target base station further comprises transmitting an instruction message to the terminal, the instruction message releasing radio resource control of the source base station and / or radio resources of the target base station. Information for instructing that the control is configured.

In the possible embodiment, the target base station may send an instruction message to the terminal.
The target base station includes transmitting the instruction message to the terminal by the source base station.

In one possible embodiment of the first direction, after the target base station receives the anchor handover request message transmitted from the source base station, the target base station confirms the anchor handover with the source base station. Before sending the message, the above method
The target base station receives the instruction message transmitted from the source base station, and
The target base station transfers the instruction message to the terminal, and
The instruction message is information for instructing that the radio resource control of the source base station is released and / or the radio resource control of the target base station is configured.

In one possible embodiment of the first direction, after the target base station receives the anchor handover request message transmitted from the source base station, the method:
The target base station transmits a rerouting request to the core network device based on the anchor handover request message.
Including further.

In the second direction, the anchor handover method is provided.
The source base station sends an anchor handover request message to the target base station,
The source base station receives the anchor handover confirmation message transmitted from the target base station, and
Here, the source base station is a base station corresponding to a service cell having a control decision right that currently provides a service to a terminal, and the target base station is controlled by the service cell. Currently, it is a base station corresponding to a secondary cell that provides a service to the terminal, and the anchor handover request message is used to request that the control decision right be switched to the target base station, and the anchor handover request message is used. The confirmation message is used to confirm the anchor handover request message.

In one possible embodiment of the second direction, after the source base station transmits an anchor handover request message to the target base station, the source base station confirms the anchor handover transmitted from the target base station. Before receiving the message, the above method
The source base station further comprises transmitting an instruction message to the terminal, the instruction message releasing the radio resource control of the source base station and / or the radio resource control of the target base station. Is information for instructing that is configured.

In the possible embodiment, the source base station may send an instruction message to the terminal.
The source base station includes transmitting the instruction message to the terminal by the target base station.

In one possible embodiment of the second direction, after the source base station receives the anchor handover confirmation message transmitted from the target base station, the method is such that the source base station is the target base station. To receive the instruction message sent by
The source base station transfers the instruction message to the terminal, and
The instruction message is information for instructing that the radio resource control of the source base station is released and / or the radio resource control of the target base station is configured.

In one possible embodiment of the second direction, the method is performed before the source base station transmits an anchor handover request message to the target base station.
The source base station receives the signal strength measurement result reported from the terminal, and
When the source base station determines that the terminal needs to hand over the anchor to the target base station based on the signal strength measurement result, the source base station is the cell corresponding to the target base station. As a secondary cell so that the source base station and the target base station can simultaneously transmit user data to the terminal.
The signal strength measurement result includes the signal strength of the cell of the source base station that the terminal is currently receiving and the signal strength of the cell of the target base station that the terminal is currently receiving. And include.

In one possible embodiment of the second direction, after the source base station receives the anchor handover confirmation message transmitted from the target base station, the method comprises the source base station performing the anchor handover. It further includes sending a rerouting request to the core network device based on the confirmation message.

In the third direction, the anchor handover method is provided.
The terminal receives the instruction message sent from the source base station or the target base station, and
The terminal establishes a radio resource control (RRC) connection control link with the target base station.
The instruction message includes information for instructing that the radio resource control of the source base station is released and that the radio resource control of the target base station is configured. The source base station is a base station corresponding to a service cell having a control decision right that currently provides a service to the terminal, and the target base station is controlled by the service cell and currently provides a service to the terminal. It is a base station corresponding to the provided secondary cell.

In one possible embodiment of the third direction, the method
The terminal receives the inactive message transmitted from the target base station, and
The terminal deactivates the source base station based on the inactive message.
The inactive message is used to instruct the source base station to be inactive.

In one possible embodiment of the third direction, the method is performed before the terminal receives an instruction message transmitted from a source or target base station.
The terminal further comprises reporting the signal strength measurement result to the source base station, the signal strength measurement result being the signal strength of the cell of the source base station currently being received by the terminal and the said. The terminal includes the signal strength of the cell of the target base station currently being received.

In the fourth direction, a base station is provided, including a receiving module and a transmitting module, and is configured to implement the corresponding embodiments in the first, second and third directions. The base station can further include a processing module to implement the corresponding embodiment.

In a fifth direction, a base station is provided, including a processor, a receiver, a transmitter and a storage device, and is configured to implement corresponding embodiments in the first, second and third directions. Each component of the base station in the direction can correspond to the corresponding module of the base station in the fourth direction.

In the sixth direction, a base station is provided, including a transmission module and a reception module, and is configured to implement the corresponding embodiments in the first, second and third directions. The base station can include a processing module to implement the corresponding embodiment.

In the seventh direction, a base station is provided, including a processor, a receiver, a transmitter and a storage device, and is configured to carry out the corresponding embodiments in the first, second and third directions. Each component of the base station in the direction can correspond to the corresponding module of the base station in the sixth direction.

In the eighth direction, a terminal is provided, including a receiving module and a processing module, and is configured to implement the corresponding embodiments in the first, second and third directions. The terminal can include a transmission module to implement the corresponding embodiment.

A ninth direction, which provides a terminal, includes a processor, a receiver, a transmitter and a storage device, and is configured to implement corresponding embodiments in the first, second and third directions, in the ninth direction. Each component of the terminal can correspond to the corresponding module of the terminal in the eighth direction.

In the first to ninth directions and the corresponding embodiments, the anchor handover request message is at least one of the context information of the terminal, the system information of the service cell, and the radio resource configuration information for the terminal. including.

According to the above technical proposal, in the anchor handover method and device in the embodiment of the present invention, the cell of the target base station is a secondary cell of the cell of the source base station, and the target base station receives the anchor handover request. Then, the operation of confirming the anchor handover is performed so that the terminal can perform the handover and the user data can be continuously transmitted, so that the control signaling can be acquired from a plurality of base stations, and the terminal can be obtained. Guarantees that the handover is smooth, reduces the delay of the handover, and improves the user experience at the time of handover.

It is a flowchart which shows the handover method of the anchor in one Example of this invention. It is a figure which shows the data transmission in the handover process of the anchor in one Example of this invention. It is a figure which shows the data transmission in the handover process of the anchor in one Example of this invention. It is a figure which shows the data transmission in the handover process of the anchor in one Example of this invention. It is a flowchart which shows the handover method of the anchor in another embodiment of this invention. It is a flowchart which shows the handover method of the anchor in another embodiment of this invention. It is a flowchart which shows the handover method of the anchor in another embodiment of this invention. It is a block diagram which shows the base station in one Example of this invention. It is a block diagram which shows the base station in another embodiment of this invention. It is a block diagram which shows the base station in another embodiment of this invention. It is a block diagram which shows the base station in another embodiment of this invention. It is a block diagram which shows the terminal in one Example of this invention. It is a block diagram which shows the terminal in another Example of this invention.

In order to more clearly explain the embodiments of the present invention, the drawings required in the description of the examples or the prior art will be briefly described above, and clearly, the drawings described above are merely the present invention. It is only a few examples of the above, and other drawings can be obtained based on these drawings on the premise that those skilled in the art do not make any creative effort.

In the following, the drawings of the examples of the present invention will be combined to clearly and fully explain the technical proposals of the examples of the present invention, and of course, the described examples are some examples of the present invention. Not all examples. Based on the examples of the present invention, all other examples obtained by those skilled in the art without any creative effort are within the scope of the present invention.

As used herein, the terms "part", "module", "system", etc. shall refer to computer-related entities, hardware, firmware, hardware-to-software combinations, software, or running software. Used. For example, components may be, but are not limited to, processes, processors, objects, executables, threads of execution, programs and / or computers running on the processor. As shown in the drawings, all applications and computing devices running on a computing device may be components. One or more parts may reside in a process and / or execution thread, and the parts may be located on one computer and / or distributed between two or more computers. In addition, these components may be executed from various computer-readable media in which various data structures are stored. A component is, for example, one or more data groups (eg, data from two components that interact with another component between a local system, a distributed system, and / or a network, eg, the Internet that interacts with another system by a signal). Can be communicated by local and / or remote processes based on signals containing.

It should be understood that the technical proposals according to the embodiments of the present invention include various communication systems such as Global System of Mobile Communication (GSM) systems, Code Division Multiple Access (CDMA) systems. System, Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS) System, Long Term Evolution System (LTE: Long Term Evolution) System, LTE Frequency Frequency Division Duplex) system, LTE Time Division Multiplex (TDD) system, Universal Mobile Communication System (UMTS), Global Interconnect System Access System And can be applied to future 5G communication systems and the like.

Each embodiment of the present invention will be described in combination with a terminal device. The terminal device can communicate with one or more core networks via a radio access network (RAN: Radio Access Network), and the terminal device is a user device (UE: User Equipment), an access terminal, a user unit, and a user site. , Mobile site, mobile station, remote site, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The access terminal device includes a cellular telephone, a cordless telephone, a session initiation protocol (SIP) telephone, a wireless local loop (WLL) site, a personal digital processing (PDA), and a wireless communication function. It may be a handheld device, a computing device or another processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a future 5G network, and the like.

The present invention describes each embodiment by combining access network devices. The access network device may be a device for communicating with a terminal in the access network, for example, a GSM system or a CDMA base station (BTS: Base Transfer Station), or a base station (NB) in a WCDMA system. : NodeB), may be an evolutionary base station (eNB or eNodeB: Evolutional NodeB) in an LTE system, or the network device may be a relay station, access point, in-vehicle device, wearable device and future It may be an access network device in a 5G network or the like.

The present invention describes some examples by combining core network devices. Core network devices are primarily used to provide user connectivity, bearer user management and services, provide an interface to external networks as a bearer network, and so on. For example, it may be a serving gateway (SGW) or PDN gateway (PGW: PDN Gateway), or other network element in the core network, where the PDN is a public user data network (Public Data Network). ..

The method of handover of the anchor in the embodiment of the present invention can be a part of the flow during the hand overflow of the base station. The base station can be handed over by the handover of the anchor. Here, the anchor refers to a base station having the control decision right for the radio resource, and the handover of the anchor refers to the switching of the control decision right between the base stations.

FIG. 1 is an anchor handover method 100 according to an embodiment of the present invention. As shown in FIG. 1, the method 100 includes S101 to S114.

In S101, the terminal reports the signal strength measurement result to the source base station, and the signal strength measurement result is the base station corresponding to the service cell currently being received by the terminal (that is, the source base before the handover. It includes the strength of the signal transmitted by the station) and the strength of the signal transmitted by the base station corresponding to the other cells around the service cell (then the target base station to be handed over).

Specifically, the signal strength measurement result is the signal strength of the cell of the source base station that the terminal is currently receiving and the signal of the cell of the target base station that the terminal is currently receiving. Including strength. The terminal may report the signal strength measurement result by the current flow, and the embodiment of the present invention is not limited thereto.

Correspondingly, the source base station receives the signal strength measurement result reported from the terminal.

In S102, the source base station states that the terminal needs to hand over (or handover) the anchor to the base station (target base station) corresponding to the target cell based on the signal strength measurement result reported by the terminal. Confirm and add the target cell as a secondary cell so that the source base station and the target base station can send user data to the terminal at the same time.

A base station corresponding to a current service cell can add a target cell as a secondary cell (also referred to as a "transmission secondary cell") by means of multi-connection technology, i.e., a primary cell (PCell: Primary Cell). ) And the secondary cell (SCell: Secondary Cell). In other words, the service cell of the source base station adds the cell corresponding to the target base station as a secondary cell by the multi-connection technology. If there is one primary cell and one secondary cell, the underlying technology is a dual connection technology. Other than that, secondary cells can be added by other techniques, and the embodiments of the present invention are not limited thereto.

Corresponding to S103 and S104 and FIG. 2A, user data may be scheduled by the primary cell (corresponding to the current service cell, source base station) and transmitted by the service cell, or may be transmitted by the secondary cell (corresponding to the current service cell, source base station). It may be transmitted by (corresponding to the target base station), or it may be transmitted by the service cell and the target cell at the same time. The control signaling is transmitted to the terminal by the service cell.

In the embodiment of the present invention, the source base station can simultaneously establish one or more base stations belonging to the target cell and the secondary cell based on the signal strength measurement result reported from the terminal. Examples of the present invention are not limited thereto.

In S105, the source base station sends an anchor handover request message to the target base station, where the anchor handover request message requests that the control decision right be switched from the source base station to the target base station. Used. When the source base station establishes a base station belonging to a plurality of target cells and a secondary cell, the source base station selects one target base station among the base stations corresponding to the plurality of target cells and performs anchor handover. Send a request message, that is, request that the Radio Resource Control (RRC) right be handed over from the source base station to the target base station so that the link of user data does not change during this process. It is retained and transmitted with the existing settings. Accordingly, the target base station receives the anchor handover request message transmitted from the source base station.

Here, the anchor handover request message includes at least one of the context information of the terminal, the system information of the service cell, and the radio resource configuration information for the terminal, and the target information sets the handover based on the above information. To do.

As an option, in S106, the target base station can send a rerouting request to the core network device based on the anchor handover request message after receiving the anchor handover request message transmitted from the source base station. .. The core network device may be a core network router such as, for example, SGW or PGW. The rerouting request is used to indicate that the user data path is diverted from the route from the core network router to the source base station to the route from the core network router to the target base station. It should be noted that S106 may be carried out, and S110 may be carried out instead, and the examples of the present invention are not limited thereto.

As an option, corresponding to FIG. 2B, after the source base station sends an anchor handover request message to the target base station, and before the source base station receives the anchor handover confirmation message transmitted from the target base station. In addition, S107 may be carried out, the source base station can directly transmit the instruction information to the terminal, and the instruction information may be set signaling, and the setting related to the radio resource control of the terminal can be set. It is used to indicate that the source base station has already been converted to the target base station, and the instruction message constitutes the release of the source base station's radio resource control and the target base station's radio resource control. Contains information to indicate that. In other words, the instruction message contains information about releasing RRC connection control and information about target cell connection settings that need to be sent to the terminal.

Alternatively, S108 may be implemented instead of S107, and the source base station may send an instruction message to the terminal by the target base station. That is, the target base station receives the instruction message transmitted from the source base station and transfers the instruction message to the terminal.

As shown in FIG. 2B, the user data is obtained after the source base station transmits the anchor handover request message to the target base station and before receiving the anchor handover confirmation message transmitted from the target base station. It can be transmitted by the source base station and / or the target base station. Control signaling such as instructional messages is determined by the source base station, i.e., the RRC decision is still in the source base station. It may be transmitted directly to the terminal by the source base station, or may be transmitted to the terminal by the target base station.

In S109, the target base station transmits an anchor handover confirmation message to the source base station, and the anchor handover confirmation message is used to confirm the anchor handover request message. Specifically, the target base station side. Information such as a wireless bearer related to a terminal that can be established in the above, a corresponding quality of service (QoS), and the like can be included. Accordingly, the source base station receives the anchor handover confirmation message transmitted from the target base station.

At the same time that the target base station sends an anchor handover confirmation message to the source base station in S109, S110 is executed, the target base station establishes an RRC connection control link with the terminal, and at this time, the RRC decision right is the source base station. Handover to the target base station.

S111 may be implemented instead of S106, and after the source base station receives the anchor handover confirmation message transmitted from the target base station, the source base station bases the core network based on the anchor handover confirmation message. Sends a rerouting request to the device so that the core network device configures the handover settings.

Instead of S107 or S108, in S109, the target base station transmits an anchor handover confirmation message to the source base station, then performs S112, and the target base station transmits the above instruction message to the terminal.

Alternatively, instead of S107, the target base station may execute S113 after transmitting the anchor handover confirmation message to the source base station in S109, and the target base station transmits an instruction message to the terminal by the source base station. That is, the source base station receives the instruction message transmitted from the target base station and transfers the instruction message to the terminal.

As shown in FIG. 2C, the user data can be transmitted by the source base station and / or the target base station after the target base station transmits the anchor handover confirmation message to the source base station. The control signaling such as the instruction message is determined by the target base station, that is, the RRC determination right has already been switched from the source base station to the target base station. It may be transmitted directly from the target base station to the terminal, or may be transmitted to the terminal by the source base station.

In S114, when the signal quality of the source base station is not good, the target base station having the RRC decision right sends an inactive message to the terminal, and the inactive message causes the terminal to deactivate the source base station. It is used to instruct. In response, the terminal receives the inactive message sent by the target base station.

In S115, the terminal deactivates the source base station based on the inactive message. Specifically, the terminal can delete the original service cell (source base station) from the service list of the terminal.

The anchor handover request in the embodiment of the present invention may be included in the handover request message in the prior art, that is, the anchor handover request message may be a handover request message, and is similar. As such, the anchor handover confirmation may be included in the handover confirmation message in the prior art, that is, the anchor handover confirmation message may be a handover confirmation message. In other words, the anchor handover request, the anchor handover confirmation, etc. in the embodiment of the present invention may be based on the message in the prior art or may be transmitted in a new message, and the embodiment of the present invention includes this. On the other hand, it is not limited.

In each embodiment of the present invention, the above-mentioned process numbers do not mean the order before and after execution, and the execution order of each process should be determined by its function and its own logic. It does not limit the implementation process of the example.

In the above technical proposal, some steps may be replaced with each other or may be omitted. By combining each step according to the logic, the following technical proposal can be obtained. For example, (S101, S102, S103 and / or S104, S105, S106, S107 or S108, S109, S110, S114, S115) or (S101, S102, S103 and / or S104, S105, S107 or S108, S109, S110, S111, S114, S115) or (S101, S102, S103 and / or S104, S105, S106, S109, S110, S112 or S113, S114, S115) or (S101, S102, S103 and / or S104, S105, S109, S110, S111, S112 or S113, S114, S115) and the like, and examples of the present invention are not limited thereto.

The anchor handover method in the embodiment of the present invention is based on the multi-connection technology, assuming that the target cell is the current service cell, an anchor handover request, a route conversion, an anchor handover confirmation, and an RRC connection control. Perform operations such as establishing a link and inactivating the source base station so that the terminal can perform a handover and continuously transmit user data to acquire control signaling from a plurality of base stations. It ensures that the terminal hands over smoothly, reduces the delay of the handover, and improves the user experience at the time of the handover.

Hereinafter, the anchor handover method 200 according to the embodiment of the present invention will be described from the target base station side. As shown in FIG. 3, the method 200 includes S201 to S202.

In S201, the target base station receives the anchor handover request message transmitted from the source base station, where the source base station is now in a service cell having control decision rights to provide services to the terminal. The corresponding base station, the target base station is the base station corresponding to the secondary cell currently servicing the terminal, controlled by the service cell, and the anchor handover request message is a control decision. It is used to request that the right be switched to the target base station.

Here, S201 corresponds to S105 of the method 100, and a specific implementation method relating thereto will be omitted here.

In S202, the target base station transmits an anchor handover confirmation message to the source base station, and the anchor handover confirmation message is used to confirm the anchor handover request message.

Here, S202 corresponds to S109 of Method 100, and a specific implementation method relating thereto will be omitted here.

An anchor handover method in the embodiment of the present invention, the cell of the target base station is a secondary cell of the cell of the source base station, and the target base station receives an anchor handover request and confirms the anchor handover. Is implemented so that the terminal can be handed over and user data can be continuously transmitted, control signaling can be acquired from a plurality of base stations, and the terminal is guaranteed to be handed over smoothly. However, the delay of the handover is shortened, and the user experience at the time of the handover is improved.

In the examples of the present invention, the method 200 further includes S203 to S204.

In S203, the target base station establishes a radio resource control (RRC) connection control link with the terminal.

Here, S203 corresponds to S110 of the method 100, and a specific implementation method relating thereto will be omitted here.

In S204, the target base station sends an inactive message to the terminal, and the inactive message is used to instruct the terminal to inactivate the source base station.

Here, S204 corresponds to S114 of the method 100, and a specific implementation method relating thereto will be omitted here.

In the anchor handover method according to the embodiment of the present invention, the cell of the target base station is a secondary cell of the cell of the source base station, and the target base station receives the anchor handover request, confirms the anchor handover, and connects to the RRC. Operations such as establishing a control link and notifying the terminal that the source base station will be inactive are performed so that the terminal can perform a handover and continuously transmit user data. , Control signaling can be obtained from multiple base stations, ensuring smooth handover of terminals, reducing handover delays and improving the user experience during handover.

Alternatively, as an embodiment, method 200 further comprises transmitting an instruction message to the terminal after the target base station has transmitted an anchor handover confirmation message to the source base station in S202. , The instruction message includes information to indicate that the radio resource control of the source base station is released and / or that the radio resource control of the target base station is configured. The step corresponds to S112 of Method 100, and a specific implementation method relating thereto will be omitted here.

Corresponding to S113 of the method 100, the target base station transmitting the instruction message to the terminal can include the target base station transmitting the instruction message to the terminal by the source base station.

Alternatively, as another embodiment, after the target base station receives the anchor handover request message transmitted from the source base station in S201, the target base station sends an anchor handover confirmation message to the source base station in S202. Prior to transmission, method 200 further comprises receiving an instruction message transmitted from the source base station by the target base station, wherein the instruction message releases radio resource control of the source base station. / Or the target base station includes information for instructing that the radio resource control of the target base station is configured, and the target base station transfers the instruction message to the terminal. The step corresponds to S108 of Method 100, and a specific implementation method relating thereto will be omitted here.

In each embodiment of the present invention, after the target base station receives the anchor handover request message transmitted from the source base station in S201, the method 200 shows that the target base station is based on the anchor handover request message. It can further include sending rerouting requests to core network devices. The step corresponds to S106 of Method 100, and a specific implementation method relating thereto will be omitted here.

In each embodiment of the present invention, the anchor handover request message includes at least one of the context information of the terminal, the system information of the service cell, and the radio resource configuration information for the terminal.

Hereinafter, the anchor handover method 300 according to the embodiment of the present invention will be described from the source base station side. As shown in FIG. 4, the method 300 includes S301 to S302.

In S301, the source base station sends an anchor handover request message to the target base station, where the source base station currently serves the terminal and corresponds to the service cell having the control decision right. The target base station is a base station that is controlled by the service cell and currently corresponds to a secondary cell that provides services to the terminal, and the anchor handover request message gives the control decision right. Used to request to switch to the target base station.

Here, S301 corresponds to S105 of the method 100, and a specific implementation method relating thereto will be omitted here.

In S302, the source base station receives the anchor handover confirmation message transmitted from the target base station, and the anchor handover confirmation message is used to confirm the anchor handover request message.

Here, S302 corresponds to S109 of the method 100, and a specific implementation method relating thereto will be omitted here.

In the anchor handover method according to the embodiment of the present invention, the cell of the target base station is a secondary cell of the cell of the source base station, and the source base station receives the request for the anchor handover and the reception of the anchor handover confirmation. It is possible to obtain control signaling from multiple base stations by allowing the terminal to hand over and continuously transmit user data, ensuring that the terminal hands over smoothly. Reduces handover delays and improves the user experience during handovers.

As an option, as one embodiment, in S301, the source base station transmits an anchor handover request message to the target base station, and then in S302, the source base station receives an anchor handover confirmation message transmitted from the target base station. The method 300 further comprises the source base station transmitting an instruction message to the terminal, which indicates that the source base station's radio resource control is released and the target base station. Information for instructing that the radio resource control of the above is configured.

The step corresponds to S107 of Method 100, and a specific implementation method relating thereto will be omitted here.

In an embodiment of the present invention, the source base station transmitting an instruction message to the terminal can include the source base station transmitting the instruction message to the terminal by the target base station. The step corresponds to S108 of Method 100, and a specific implementation method relating thereto will be omitted here.

Alternatively, as another embodiment, in S302, after the source base station receives the anchor handover confirmation message transmitted from the target base station, the method 300 transmits the source base station from the target base station. It is possible to further include receiving the indicated instruction message, which comprises releasing the radio resource control of the source base station and / or configuring the radio resource control of the target base station. This is information for instructing that, and the source base station transfers the instruction message to the terminal. The step corresponds to S113 of Method 100, and a specific implementation method relating thereto will be omitted here.

In each embodiment of the present invention, in the method 300, the source base station is the signal strength measurement result reported by the terminal before the source base station transmits an anchor handover request message to the target base station in S301. The signal strength measurement results include the signal strength of the cell of the source base station that the terminal is currently receiving and the signal strength that the terminal is currently receiving. If the source base station includes the signal strength of the cell of the target base station and determines that the terminal needs to handover to the target base station based on the signal strength measurement result, the source base station The station adds a cell corresponding to the target base station as a secondary cell so that the source base station and the target base station can simultaneously transmit user data to the terminal.

The above steps can correspond to S101 and S102 of the method 100, and a specific implementation method relating thereto will be omitted here.

In each embodiment of the present invention, in S302, after the source base station receives the anchor handover confirmation message transmitted from the target base station, in the method 300, the source base station becomes the anchor handover confirmation message. Based on this, it further includes sending a rerouting request to the core network device. The step can correspond to S111 of the method 100, and a specific implementation method relating thereto will be omitted here.

In each embodiment of the present invention, the anchor handover request message includes at least one of the context information of the terminal, the system information of the service cell, and the radio resource configuration information for the terminal.

From the terminal side, the anchor handover method 400 according to the embodiment of the present invention will be described. As shown in FIG. 5, the method 400 includes S401-S402.

In S401, the terminal receives the instruction message transmitted from the source base station or the target base station, and the instruction message is that the radio resource control of the source base station is released and the radio resource of the target base station is released. Information for instructing that control is configured, where the source base station is a base station corresponding to a service cell that currently provides services to terminals and has control decision-making power.

Here, S401 corresponds to S107, S108, S112 or S113 of the method 100, and a specific implementation method relating thereto will be omitted here.

In S402, the terminal establishes a radio resource control (RRC) connection control link with the target base station.

Here, S402 corresponds to S110 of the method 100, and a specific implementation method relating thereto will be omitted here.

In the anchor handover method according to the embodiment of the present invention, in the handover process, the terminal receives the instruction message transmitted from the base station, sets it, establishes the RRC connection control link, and the terminal hands over. At the same time, the user data can be continuously transmitted, the control signaling can be acquired from a plurality of base stations, the terminal can be ensured to perform a smooth handover, and the delay of the handover can be shortened. Improve the user experience during handover.

In the examples of the present invention, the method 400 further includes S403 to S404.

In S403, the terminal receives an inactive message transmitted from the target base station, and the inactive message is used to instruct the terminal to inactivate the source base station.

Here, S402 corresponds to S114 of the method 100, and a specific implementation method relating thereto will be omitted here.

In S404, the terminal deactivates the source base station based on the inactive message.

Here, S402 corresponds to S115 of the method 100, and a specific implementation method relating thereto will be omitted here.

In the anchor handover method according to the embodiment of the present invention, in the handover process, the terminal receives the instruction message transmitted from the base station, sets it, establishes the RRC connection control link, and sends it to the source base station. On the other hand, inactivity is performed so that the terminal can hand over and user data can be continuously transmitted, and control signaling can be acquired from a plurality of base stations, so that the terminal hands over smoothly. Guarantee that, reduce handover delays and improve the user experience during handover.

In an embodiment of the present invention, the method 400 may be performed before the S401 terminal receives an instruction message transmitted from a source base station or a target base station.
The terminal can further include reporting the signal strength measurement result to the source base station, which is the signal strength of the cell of the source base station that the terminal is currently receiving. And the signal strength of the cell of the target base station that the terminal is currently receiving. When the source base station needs to hand over to the target base station based on the signal strength measurement result, the source base station adds a cell corresponding to the target base station as a secondary cell. The source base station and the target base station enable the user data to be simultaneously transmitted to the terminal.

In each embodiment of the present invention, the above-mentioned process numbers do not mean the order before and after execution, and the execution order of each process should be determined by its function and its own logic. It does not limit the implementation process of the example.

The method of handover of the anchor in the embodiment of the present invention has been described in detail above, and the base station and the terminal of the handover of the anchor in the embodiment of the present invention will be described below.

FIG. 6 is a block diagram showing a base station 500 according to an embodiment of the present invention. The base station 500 is a target base station, and the base station 500 includes a receiving module 510 and a transmitting module 520.

The receiving module 510 is configured to receive the anchor handover request message transmitted from the source base station, wherein the source base station is currently a service cell having control decision-making authority to provide a service to a terminal. The target base station is a base station that is controlled by the service cell and currently corresponds to a secondary cell that provides a service to the terminal, and the anchor handover request message is controlled. It is used to request that the decision-making power be switched to the target base station.

The transmission module 520 is configured to transmit an anchor handover confirmation message to the source base station, and the anchor handover confirmation message is for confirming the anchor handover request message received by the reception module 510. Used.

In the base station according to the embodiment of the present invention, the cell of the target base station is a secondary cell of the cell of the source base station, and the target base station receives an anchor handover request and performs an operation of confirming the anchor handover. It is possible to obtain control signaling from multiple base stations by allowing the terminal to hand over and continuously transmit user data, ensuring that the terminal hands over smoothly. Reduces handover delays and improves the user experience during handovers.

As an option, in the embodiments of the present invention, the base station 500 can further include a processing module 530.
The processing module 530 is configured to establish a radio resource control (RRC) connection control link with the terminal.

The transmission module 520
Further configured to send an inactive message to the terminal, the inactive message is used to instruct the terminal to inactivate the source base station.

As an option, as an embodiment, the transmission module 520
The transmission module 520 is further configured to transmit an instruction message to the terminal after transmitting the anchor handover confirmation message to the source base station, and the instruction message releases the radio resource control of the source base station. And / or information for instructing that the radio resource control of the target base station is configured.

As an option, the transmission module 520 can be specifically configured to transmit the instruction message to the terminal by the source base station.

As an option, as another embodiment, the receiving module 510
It was transmitted from the source base station after the receiving module 510 received the anchor handover request message transmitted from the source base station and before the transmitting module transmitted the anchor handover confirmation message to the source base station. The instruction message can be further configured to receive the instruction message, the instruction message being configured to release the radio resource control of the source base station and / or the radio resource control of the target base station. It is information for instructing to be done.

The transmission module 520
It can be further configured to transfer the instruction message to the terminal.

As an option, in the embodiments of the present invention, the transmission module 520
After receiving the anchor handover request message transmitted from the source base station, the receiving module 510 may be further configured to transmit a rerouting request to the core network device based on the anchor handover request message. It is possible.

As an option, in the embodiment of the present invention, the anchor handover request message includes at least one of the context information of the terminal, the system information of the service cell, and the radio resource configuration information for the terminal.

In the embodiment of the present invention, the receiving module 510 may be realized by the receiver, the transmitting module 520 may be realized by the transmitter, and the processing module 530 may be realized by the processor. As shown in FIG. 7, the base station 600 can include a processor 610, a receiver 620, a transmitter 630 and a storage device 640. Here, the storage device 640 is configured to store the code or the like executed by the processor 610.

Each component in the base station 600 is coupled by a bus system 650, where the bus system 650 includes a power bus, a control bus and a status signal bus in addition to the data bus.

The base station 500 shown in FIG. 6 or the base station 600 shown in FIG. 7 can realize each process realized in the examples of FIGS. 1 to 5, and here in order to avoid duplication. Omitted with.

The embodiment of the above method of the present invention may be applied to a processor or may be realized by a processor. The processor may be an integrated circuit chip and has signal processing capabilities. In the implementation process, each step in the embodiment of the above method may be completed by a hardware integrated logic circuit in the processor or a software form instruction. The above processors are general-purpose processors, digital signal processors (DSPs), dedicated integrated circuits (ASICs), programmable gate arrays (FPGAs: Field Programmable Logic), and other programmable gate arrays (FPGAs). , Discrete gate or transistor logic device, discrete hardware component. Each of the disclosed methods, steps and logical block diagrams in the examples of the present invention can be realized or implemented. The general-purpose processor may be a microprocessor, or the processor may be any ordinary processor or the like. The steps of combining the methods disclosed in the embodiments of the present invention are embodied to be performed and completed by a hardware decoding processor or by a combination of hardware and software modules in the decoding processor. be able to. Software modules may be located in mature storage media in the art such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers. The storage medium is located in memory and the processor reads the information in memory and combines it with its hardware to complete the steps of the above method.

It can be understood that the memory in the embodiment of the present invention may be a volatile storage device or a non-volatile storage device, or may include both a volatile storage device and a non-volatile storage device. Here, the non-volatile storage device includes a read-only memory (ROM: Read-Only Memory) and a programmable read-only memory (PROM: Programmable).
It may be a ROM), an erasable programmable read-only memory (EPROM: Erasable PROM), an electrically erasable programmable read-only memory (EEPROM: Electrically EPROM), or a flash memory. The volatile storage device may be a random access memory (RAM: Random Access Memory) that functions as an external cache memory. By exemplary rather than restrictive, many forms of RAM are available, such as static random access memory (SRAM: Static RAM), dynamic random access memory (DRAM: Dynamic RAM), synchronous dynamic random access. Memory (SDRAM: Synchronous DRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRS DRAM: Double Data Rate DRAM), Enhanced Synchronous Dynamic Random Access Memory (ES DRAM: Enhanced DRAM), Synchronous Link Dynamic Random Access Memory (SL DRAM) : Synclink DRAM) and direct rambus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these, and any other suitable type of memory.

FIG. 8 is a block diagram showing a base station 700 according to another embodiment of the present invention. The base station 700 is a source base station, and the base station 700 includes a transmission module 710 and a reception module 720.

The transmission module 710 is configured to transmit an anchor handover request message to the target base station, wherein the source base station currently corresponds to a service cell having control decision rights that provides services to the terminal. It is a base station, and the target base station is a base station that is controlled by the service cell and currently corresponds to a secondary cell that provides a service to the terminal, and the anchor handover request message gives control decision right. It is used to request switching to the target base station.

The receiving module 720 is configured to receive the anchor handover confirmation message transmitted from the target base station, and the anchor handover confirmation message sends the anchor handover request message transmitted by the transmission module 710. Is used to confirm.

In the base station according to the embodiment of the present invention, the cell of the target base station is a secondary cell of the cell of the source base station, and the source base station receives the request for anchor handover and the confirmation of anchor handover, and the terminal. Handovers, user data can be continuously transmitted, control signaling can be obtained from multiple base stations, and the terminal is guaranteed to be handed over smoothly. Reduce delays and improve the user experience during handover.

As an option, as an embodiment, the transmission module 710
After the transmitting module 710 transmits an anchor handover request message to the target base station, and before the receiving module 720 receives the anchor handover confirmation message transmitted from the target base station, an instruction message is transmitted to the terminal. The instruction message can be further configured such that the radio resource control of the source base station is released and / or the radio resource control of the target base station is configured. Information for instructing.

As an option, the transmission module 710 specifically
The target base station is configured to transmit the instruction message to the terminal.

As an option, as another embodiment, the receiving module 72
The receiving module 720 can be further configured to receive the instruction message transmitted from the target base station after receiving the anchor handover confirmation message transmitted from the target base station. The message is information for instructing that the radio resource control of the source base station is released and / or that the radio resource control of the target base station is configured.

The transmission module 710
It can be further configured to send the instruction message to the terminal.

As an option, in the embodiments of the present invention, the receiving module 720
The transmission module 710 can be further configured to receive the signal strength measurement result reported by the terminal before transmitting the anchor handover request message to the target base station, and the signal strength measurement result can be further configured. Includes the signal strength of the cell of the source base station that the terminal is currently receiving and the signal strength of the cell of the target base station that the terminal is currently receiving.

The base station 700 can further include a processing module 730.

When the processing module 730 determines that the terminal needs to hand over the anchor to the target base station based on the signal strength measurement result, the processing module 730 adds a cell corresponding to the target base station as a secondary cell. The source base station and the target base station can simultaneously transmit user data to the terminal.

As an option, in the embodiments of the present invention, the transmission module 710
The receiving module 720 is further configured to transmit a rerouting request to the core network device based on the anchor handover confirmation message after receiving the anchor handover confirmation message transmitted from the target base station. Is possible.

As an option, in the embodiment of the present invention, the anchor handover request message includes at least one of the context information of the terminal, the system information of the service cell, and the radio resource configuration information for the terminal.

In the embodiment of the present invention, the receiving module 720 may be realized by the receiver, the transmitting module 710 may be realized by the transmitter, and the processing module 730 may be realized by the processor. As shown in FIG. 9, the base station 800 can include a processor 810, a receiver 820, a transmitter 830, and a storage device 840. Here, the storage device 840 can be used to store the code or the like executed in the processor 810.

Each component in the base station 800 is coupled by a bus system 850, where the bus system 850 includes a power bus, a control bus and a status signal bus in addition to the data bus.

The base station 700 shown in FIG. 8 or the base station 800 shown in FIG. 9 can realize each process realized in the examples of FIGS. 1 to 5, and here in order to avoid duplication. I won't say any more.

FIG. 10 is a block diagram to show the terminal 900 in one embodiment of the present invention. The terminal 900 includes a receiving module 910 and a processing module 920.

The receiving module 910 is configured to receive an instruction message transmitted from the source base station or the target base station, and the instruction message is that the radio resource control of the source base station is released and the target base station is released. Contains information to indicate that the radio resource control of the above is configured, wherein the source base station is a base station corresponding to a service cell that currently provides services to the terminal and has control decision-making authority. The target base station is a base station that is controlled by the service cell and currently corresponds to a secondary cell that provides services to the terminal.

The processing module 920 is configured to establish a radio resource control (RRC) connection control link with the target base station.

In the handover process, the terminal in the embodiment of the present invention receives the instruction message transmitted from the base station, sets it, establishes the RRC connection control link, causes the terminal to perform the handover, and continues the user data. Control signaling can be obtained from multiple base stations, ensuring smooth handover of terminals, reducing handover delays, and user experience during handover. To improve.

As an option, in the embodiments of the present invention, the receiving module 910 is
It can be further configured to receive inactive messages transmitted from the target base station, which instruct the terminal to inactivate the source base station. Used for

The processing module 920
Based on the inactive message received by the receiving module 910, it can be further configured to be inactive with respect to the source base station.

As an option, in the embodiments of the present invention, the terminal 900 can further include a transmission module 930.

The transmission module 930 is configured to report the signal strength measurement result to the source base station before the reception module 910 receives the instruction message transmitted from the source base station or the target base station, and the signal strength measurement is performed. The result includes the signal strength of the cell of the source base station that the terminal is currently receiving and the signal strength of the cell of the target base station that the terminal is currently receiving.

In the embodiment of the present invention, the receiving module 910 may be realized by the receiver, the transmitting module 930 may be realized by the transmitter, and the processing module 920 may be realized by the processor. As shown in FIG. 11, the terminal 1000 can include a processor 1010, a receiver 1020, a transmitter 1030, and a storage device 1040. Here, the storage device 1040 can be used to store the code or the like executed in the processor 1010.

Each component in the terminal 1000 is coupled by a bus system 1050, where the bus system 1050 includes a power bus, a control bus, and a status signal bus in addition to the data bus.

The terminal 900 shown in FIG. 10 or the terminal 1000 shown in FIG. 11 can realize each process realized in the examples of FIGS. 1 to 5, and here in order to avoid duplication, it is possible to realize each process. I will not mention it above.

It is said that the steps of each exemplary unit and algorithm described in the examples disclosed in the present application can be combined and realized using electronic hardware or a combination of computer software and electronic hardware. Any trader can understand. Whether these functions are implemented in the form of hardware or software depends on the specific application of the technical proposal and design constraints. One of ordinary skill in the art can realize the functions described using different methods for each particular application, but such realization should not be considered beyond the scope of the present invention.

One of ordinary skill in the art can refer to the corresponding flow of the above method embodiments for specific operations of the systems, devices and units described above for convenience and brevity of description. I won't say any more.

In some of the embodiments provided in the present application, the disclosed systems, devices and methods may be implemented in other ways. For example, the examples of the devices described above are merely exemplary, for example, the division of the units is merely a logical functional division, and in fact, other divisions when realized. It may be present, for example, a plurality of units or components may be integrated or assembled into another system, or some technical features may be omitted or not implemented. Also, the mutual coupling, or direct coupling, or communication connection of each component specified or discussed is connected by indirect coupling or communication of several interfaces, devices, or units. It may be of any form, electrical, mechanical, or other.

The units described above as separate components may or may not be physically separated. The component shown as a unit may or may not be a physical unit. It may be arranged in one place or distributed to a plurality of network units. Depending on the actual needs, some or all of the units may be selected to realize the purpose of the technical proposal of this embodiment.

Further, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may be a single unit, and two or more units may be integrated into one unit. You may.

The function is realized by the method of a software function unit, and when sold or used as an independent product, it may be stored in a computer-readable storage medium. As a result, the part of the technical proposal of the present invention that contributes to the prior art can be realized in the form of a software product, and the computer software product is stored in a storage medium and is stored in a computer device (personal computer, server, or network device). Etc.) include a plurality of instructions for executing the above-mentioned method in all or part of each embodiment of the present invention. The above storage medium stores various program codes such as a USB memory, a mobile storage medium, a read-only memory (ROM: Read-Only Memory), a random access storage device (RAM: Random Access Memory), a magnetic disk, or a compact disk. Includes capable media.

The above description is merely a specific embodiment of the present invention, and the present invention is not limited thereto, and modifications or modifications that can be easily conceived by those skilled in the art within the scope disclosed in the present invention. All replacements should be included within the scope of the present invention. Therefore, the scope of the present invention should conform to the stated claims.

Claims (15)

It ’s a handover method.
The target base station receives the handover request message transmitted from the source base station, and
The target base station includes transmitting a handover confirmation message to the source base station.
Here, the source base station is a base station corresponding to a service cell that currently provides a service to the terminal and has a control decision right, and the target base station is currently controlled by the service cell. It is a base station corresponding to a secondary cell (SCell) that provides a service to the above, and the handover request message is used to request that the control decision right be switched to the target base station, and the handover confirmation message is used. Is used to confirm the handover request message.
Before the target base station receives the handover request message transmitted from the source base station, the service cell corresponding to the source base station and the secondary cell corresponding to the target base station are the terminals. Send user data to
The handover method. The target base station establishes radio resource control (RRC) connection control with the terminal.
The target base station further comprises sending an inactive message to the terminal.
The inactive message is used to instruct the terminal to inactivate the source base station.
The handover method according to claim 1, wherein the handover method is described. After the target base station sends a handover confirmation message to the source base station,
The target base station further includes transmitting an instruction message to the terminal.
The instruction message is information for instructing that the radio resource control of the source base station is released and / or that the radio resource control of the target base station is configured.
The handover method according to claim 1 or 2, wherein the handover method is described. The target base station may send an instruction message to the terminal.
The target base station includes transmitting the instruction message to the terminal by the source base station.
The handover method according to claim 3, wherein the handover method is described. After the target base station receives the handover request message transmitted from the source base station, and before the target base station transmits the handover confirmation message to the source base station.
The target base station further includes receiving an instruction message transmitted from the source base station.
The instruction message is information for instructing that the radio resource control of the source base station is released and / or that the radio resource control of the target base station is configured.
The handover method according to claim 1 or 2, wherein the handover method is described. After receiving the handover request message transmitted from the source base station, the target base station
The target base station further includes transmitting a rerouting request to the core network device based on the handover request message.
The handover method according to claim 1, wherein the handover method is described. The handover request message includes at least one of the context information of the terminal, the system information of the service cell, and the radio resource configuration information for the terminal.
The handover method according to claim 1, wherein the handover method is described. It ’s a handover method.
The source base station sends a handover request message to the target base station,
The source base station includes receiving a handover confirmation message transmitted from the target base station.
Here, the source base station is a base station corresponding to a service cell that currently provides a service to the terminal and has a control decision right, and the target base station is currently controlled by the service cell. It is a base station corresponding to a secondary cell (SCell) that provides a service to the above, and the handover request message is used to request that the control decision right be switched to the target base station, and the handover confirmation message is used. Is used to confirm the handover request message.
Before the source base station transmits the handover request message to the target base station, the service cell corresponding to the source base station and the secondary cell corresponding to the target base station transmit user data to the terminal. Send at the same time,
The handover method. After the source base station transmits a handover request message to the target base station, and before the source base station receives the handover confirmation message transmitted from the target base station.
The source base station further includes sending an instructional message to the terminal.
The instruction message is information for instructing that the radio resource control (RRC) of the source base station is released and / or that the radio resource control of the target base station is configured.
8. The handover method according to claim 8. The source base station may send an instruction message to the terminal.
The source base station includes transmitting the instruction message to the terminal by the target base station.
9. The handover method according to claim 9. After receiving the handover confirmation message transmitted from the target base station, the source base station
The source base station receives the instruction message transmitted from the target base station, and
The source base station includes transferring the instruction message to the terminal.
The instruction message is information for instructing that the radio resource control of the source base station is released and / or that the radio resource control of the target base station is configured.
8. The handover method according to claim 8. The source base station sends a handover request message to the target base station before sending it.
The source base station receives the signal strength measurement result reported from the terminal, and
When the source base station determines that the terminal needs to hand over to the target base station based on the signal strength measurement result, the source base station transfers the target base station to at least one secondary. Including adding as a secondary node containing a cell so that the source base station and the target base station can simultaneously transmit user data to the terminal.
The signal strength measurement result includes the signal strength of the cell of the source base station that the terminal is currently receiving and the signal strength of the cell of the target base station that the terminal is currently receiving. ,
The handover method according to any one of claims 8 to 11, wherein the handover method is described. After receiving the handover confirmation message transmitted from the target base station, the source base station
The source base station sends a rerouting request to the core network device based on the handover confirmation message.
Including
And / or the handover request message includes at least one of the terminal context information, the service cell system information, and the radio resource configuration information for the terminal.
The handover method according to any one of claims 8 to 12, wherein the handover method is described. It ’s a handover method.
The terminal receives the instruction message sent from the source base station or the target base station, and
The terminal includes establishing radio resource control (RRC) connection control with the target base station.
The instruction message includes information for instructing that the radio resource control (RRC) of the source base station is released and / or that the radio resource control of the target base station is configured. The source base station is a base station corresponding to a service cell that currently provides a service to the terminal and has a control decision right, and the target base station is currently controlled by the service cell to the terminal. A base station that corresponds to the secondary cell (SCell) that provides the service.
Before the terminal receives the instruction message transmitted from the source base station or the target base station, the method is:
The terminal further comprises receiving user data simultaneously transmitted by the service cell corresponding to the source base station and the secondary cell corresponding to the target base station.
The handover method. The handover method is
The terminal receives the inactive message transmitted from the target base station, and
The terminal includes inactivating the source base station based on the inactive message.
The inactive message is used to instruct the terminal to inactivate the source base station.
And / or
The terminal receives an instruction message transmitted from the source base station or the target base station before receiving the instruction message.
The terminal further comprises reporting the measurement result to the source base station.
The measurement result includes the signal strength of the cell of the source base station that the terminal is currently receiving and the signal strength of the cell of the target base station that the terminal is currently receiving.
14. The handover method according to claim 14.

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