WO2018153344A1

WO2018153344A1 - Handover preparation method, base station and user equipment

Info

Publication number: WO2018153344A1
Application number: PCT/CN2018/076974
Authority: WO
Inventors: 孙立新; 丁颖哲; 周明宇; 路杨
Original assignee: 北京佰才邦技术有限公司
Priority date: 2017-02-23
Filing date: 2018-02-22
Publication date: 2018-08-30
Also published as: CN108471631B; CN108471631A

Abstract

Provided are a handover preparation method, a base station and a user equipment (UE), wherein the method comprises: an original base station accessed by a UE sending an automatic handover preparation request carrying UE context information and target cell indication information to at least one target base station, wherein the at least one target base station carrying out, according to the target cell indication information, automatic handover admission control; the original base station receiving automatic handover preparation response information sent by the at least one target base station; and if the automatic handover preparation response information sent by the at least one target base station comprises first target cell information successfully admitting the UE to carry out automatic handover, then the original base station sending automatic handover configuration information to the UE, wherein the automatic handover configuration information at least comprises a cell identification of a first target cell.

Description

Switch preparation method, base station and user terminal

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. 201710100937.X filed on Jan. 23, 2017, the entire content of

Technical field

The present disclosure relates to the field of communications technologies, and in particular, to a handover preparation method, a base station, and a user equipment (UE (User Equipment)).

Background technique

MulteFire is a wireless access technology that extends LTE (Long Term Evolution) to unlicensed bands. In this technique, unlicensed band carriers can provide services independently without the aid of a licensed band carrier. The MulteFire system supports automatic handover of a user terminal (UE), that is, when the UE detects that the channel quality of the current access cell and the neighboring cell meets the handover condition, the UE can automatically initiate random access to the target cell to access the target cell, without receiving The handover is performed only after the handover command of the current cell is accessed.

However, in the related automatic handover scheme, the UE cannot know the RRC (Radio Resource Control) resource configuration of the target cell to the UE, thereby easily affecting the handover efficiency.

Summary of the invention

Embodiments of the present disclosure provide a handover preparation method, a base station, and a user terminal (UE).

According to a first aspect of the present disclosure, a handover preparation method is provided. The method includes: an original base station accessed by a user terminal UE transmitting, to at least one target base station, context information carrying at least the UE and target cell indication information. An automatic handover preparation request, where the target cell indication information is used to indicate that the at least one target base station performs radio resource control RRC resource configuration on the UE according to the target cell indication information, where context information of the UE is used to indicate The at least one target base station saves context information of the UE in at least one second target cell; the original base station receives an automatic handover preparation response message sent by the at least one target base station; and if the at least one target base station sends The automatic handover preparation response message includes the first target cell information that successfully accepts the UE for automatic handover, and the original base station sends automatic handover configuration information to the UE, where the automatic handover configuration information includes at least the first target The cell identity of the cell.

According to the second aspect of the present disclosure, a handover preparation method is further provided, the method includes: the target base station receiving, by the original base station accessed by the user equipment UE, at least the context information of the UE and the target cell indication information a handover preparation request; the target base station performs automatic handover admission control on the UE according to the target cell indication information, and the target base station saves the UE in at least one second target cell according to context information of the UE. Context information; and the target base station sends an automatic handover preparation response message to the original base station, where the automatic handover preparation response message includes successfully receiving the UE if the target base station successfully accepts the UE for automatic handover The first target cell information for automatic switching is performed.

According to a third aspect of the present disclosure, a handover preparation method is further provided, the method comprising: receiving, by a user equipment UE, automatic handover configuration information sent by an original base station; and if the automatic handover configuration information includes at least successfully receiving the UE And automatically selecting the cell identifier of the first target cell, and the UE selects the target cell that is automatically switched according to the automatic handover configuration information.

According to a fourth aspect of the present disclosure, there is also provided a first base station, which is an original base station and includes a processor, a memory, and a bus interface, wherein the processor and the memory are connected by the bus interface, wherein The memory is configured to store programs and data stored by the processor when performing operations, and the processor is configured to read programs and data stored in the memory to control the first base station to execute according to the The method described on the one hand.

According to a fifth aspect of the present disclosure, a second base station is further provided, the second base station is a target base station and includes a processor, a memory, and a bus interface, wherein the memory is configured to store the processor when performing an operation Stored programs and data, and the processor is operative to read programs and data stored in the memory to control the second base station to perform the method according to the second aspect.

According to a sixth aspect of the present disclosure, a user terminal UE is further provided, including a processor, a memory, and a bus interface, wherein the processor, the transceiver, and the memory are connected by the bus interface, wherein the memory And storing the program and data stored by the processor when performing an operation, and the processor is configured to read a program and data stored in the memory to control the user terminal to perform according to the third aspect method.

According to a seventh aspect of the present disclosure, a first base station is further provided, where the first base station is an original base station, and includes: a sending module, configured to send, to at least one target base station, a user that at least carries the access to the first base station The context information of the terminal UE and the automatic handover preparation request of the target cell indication information, where the target cell indication information is used to indicate that the at least one target base station performs automatic handover admission control on the UE according to the target cell indication information, The context information of the UE is used to indicate that the at least one target base station saves context information of the UE in the at least one second target cell, and the receiving module is configured to receive an automatic handover preparation response message sent by the at least one target base station. And determining, configured to determine whether the automatic handover preparation response message sent by the at least one target base station includes first target cell information that successfully accepts the UE for automatic handover, wherein if the at least one target base station sends an automatic handover Preparing the response message includes successfully accepting the UE for self- First target handover cell information, the sending module sends the configuration information is automatically switched to the UE, the automatic switch configuration comprising at least cell identification information of the first target cell.

According to an eighth aspect of the present disclosure, a second base station is further provided, where the second base station is a target base station, and includes: a receiving module, configured to receive a context that is sent by the original base station accessed by the user terminal UE and that carries at least the UE The information and the automatic handover preparation request of the target cell indication information; the configuration module is configured to perform automatic handover admission control on the UE according to the target cell indication information; and the saving module is configured to: at least one according to the context information of the UE Saving the context information of the UE in the second target cell; and the sending module is configured to send an automatic handover preparation response message to the original base station, where the automatic handover is performed if the target base station successfully accepts the UE The handover preparation response message includes first target cell information that successfully accepts the UE for automatic handover.

According to a ninth aspect of the present disclosure, a user terminal UE is further provided, the UE includes: a receiving module, configured to receive automatic switching configuration information sent by an original base station accessed by the UE; and a determining module configured to determine the automatic switching configuration Whether the information includes the cell identifier of the first target cell that successfully accepts the UE for automatic handover; and the selecting module, configured to: in the automatic handover configuration information, the cell identifier of the first target cell that successfully accepts the UE for automatic handover In the case of the automatic switching configuration information, the target cell that is automatically switched is selected.

DRAWINGS

FIG. 1 is a schematic flowchart of a handover preparation method according to an embodiment of the present disclosure;

2 is a schematic diagram of data transmission in a handover preparation method according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of data transmission in an automatic handover process of a UE according to an embodiment of the present disclosure;

4 is a schematic diagram of data transmission in an automatic handover process of a UE according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of data transmission in an automatic handover process of a UE according to an embodiment of the present disclosure;

FIG. 6 is a schematic flowchart of a handover preparation method according to an embodiment of the present disclosure;

FIG. 7 is a schematic flowchart of a handover preparation method according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a first base station according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of a second base station according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of a UE according to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram of a first base station according to an embodiment of the present disclosure;

FIG. 12 is a schematic structural diagram of a second base station according to an embodiment of the present disclosure;

FIG. 13 is a schematic structural diagram of a UE according to an embodiment of the present disclosure.

detailed description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. It is apparent that the described embodiments are a part of the embodiments of the present disclosure, and not all of them. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without departing from the scope of the invention are within the scope of the disclosure.

The present disclosure provides an automatic handover preparation method, a base station, and a user equipment UE, to solve the problem that the UE cannot learn the radio resource control (RRC) resource configuration of the target cell to the UE in the related automatic handover scheme, thereby easily affecting the handover efficiency. problem.

MulteFire (hereinafter referred to as MF) is a wireless access technology that extends Long Term Evolution (LTE) to unlicensed bands. In this technique, unlicensed band carriers can be independently serviced without the aid of a licensed band carrier. In order to fairly occupy unlicensed band channels and avoid interference between unlicensed band devices by other devices operating in unlicensed bands (such as Wireless Fidelity (WiFi) devices), the MF physical layer introduces LBT (like WiFi-based carrier sensing technology). Listen Before Talk, listen to the mechanism first. When the base station or the UE monitors that the unlicensed band channel is occupied, that is, when the LBT fails, the signal is stopped; when the base station or the UE monitors that the channel is idle, that is, the LBT succeeds, the signal is transmitted.

In order to improve the downlink common control signal transmission efficiency of the base station under the LBT mechanism, MulteFire introduces a Discovery Reference Signal (DRS). The DRS includes the main downlink common control signals, system broadcast, Primary Sync Signal (PSS), Secondary Sync Signal (SSS), Enhanced Primary Sync Signal (ePSS), and enhanced auxiliary. Enhanced Secondary Sync Signal (eSSS), Cell Reference Signal (CRS), Master Information Block (MIB), and Enhanced System Information Block Multefire (SIB-MF). The DRS occupies 12 or 14 symbols (Symbols) in one downlink subframe. The UE may receive the DRS in the Discovery Signals Measurement Timing Configuration (DMTC) window for downlink synchronization, reception MIB, and SIB-MF. The MF cell transmits the CRS only in the DRS subframe or other subframes that are transmitted by the Physical Downlink Shared Channel (PDSCH). Therefore, the UE can perform channel measurement on the MF serving cell or the MF neighboring cell only in the DMTC window. Perform cell selection, cell reselection or handover.

The eNB may send the DMTC information of the serving cell, the intra-frequency neighboring cell, and the inter-frequency neighboring cell to the UE, and broadcast the DMTC information of the current MF serving cell through the SIB-MF, and send the same-frequency MF neighboring cell through the SIB3 broadcast or through the UE-specific RRC message. DMTC information, the DMTC information of the inter-frequency MF neighboring cell of the specified frequency point is sent by the SIB5 broadcast or by the UE-specific RRC message, so that the UE learns the DRS transmission time of the MF serving cell, the intra-frequency neighboring cell, and the inter-frequency neighboring cell according to the DMTC information. Window for channel measurement. The MF serving cell DMTC information includes DMTC parameters. The DMTC parameters include: DMTC window duration (dmtc-duration), DMTC window period (dmtc-Periodicity), and subframe offset (dmtc-Offset).

MulteFire provides two basic access modes of the network architecture, namely the Public Land Mobile Network (PLMN) access mode and the Neutral Host Network (NHN) access mode. Among them, the NHN access mode is a unified planning and self-organizing neutral network newly introduced by MulteFire. One NHN can be shared to multiple service providers at the same time, and the MF RAN is connected to the core network (CN) of the NHN, and the MF cell The NH network ID (NHN-ID) and the Participating Service Provider Identity (PSP-ID) are sent in the broadcast message. The PLMN access mode is a network mode in which the MF RAN is connected to the mobile operator's 3rd Generation Partnership Project 3GPP CN, and the UE may perform S1 or X2 handover between the MF RAN of the PLMN access mode and the 3GPP RAN, in the MF cell A list of PLMN IDs is sent in the broadcast message. In addition, there is also a hybrid access mode in which the MF RAN is simultaneously connected to the NHN CN and the 3GPP CN, and the NHN-ID, PSP-ID, and PLMN ID list are simultaneously broadcast in the broadcast message of the MF cell.

When the measurement result of the UE located in the Multefire cell satisfies the handover condition, if the channel is occupied according to the LBT mechanism, the measurement report cannot be sent. Similarly, after receiving the measurement report of the terminal, the Multefire cell monitors the channel according to the LBT mechanism. When it is occupied, it will not be able to send a switching command, resulting in a too long switching delay. Therefore, the UE automatic handover mechanism is supported in the Multefire system. When detecting that the channel quality of the current access cell and the neighboring cell meets the handover condition, the UE can automatically initiate random access to the target cell without receiving the handover command of the current access cell. When the UE detects that the channel quality of the current access cell and the neighboring cell meets the handover condition, the UE does not send a measurement report to the current cell and waits for the handover command of the current cell to reduce the handover delay.

Based on the above-described UE automatic handover mechanism, the present disclosure provides a handover preparation method, which will be described in detail below in conjunction with specific embodiments.

It should be noted that, in the embodiment of the present disclosure, the UE may be a mobile phone (or a mobile phone), or other device capable of transmitting or receiving a wireless signal, including a user equipment (terminal), a personal digital assistant (PDA), and a wireless device. Modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, CPE (Customer Premise Equipment) or mobile intelligent hotspot, intelligent capable of converting mobile signals into WiFi signals A home appliance or other device that can spontaneously communicate with a mobile communication network without human operation.

The base station is not limited in form, and may be a Macro Base Station, a Pico Base Station, a Node B (3G mobile base station), an Enhanced Base Station (ENB), and a Home Enhanced Base Station (Femto eNB). Or Home eNode B or Home eNB or HNEB), relay station, access point, RRU (Remote Radio Unit), RRH (Remote Radio Head).

Referring to FIG. 1 , FIG. 1 is a schematic flowchart diagram of a handover preparation method according to an embodiment of the present disclosure. The executor of the handover preparation method may be the original base station accessed by the UE. As shown in FIG. 1, the method includes the following steps S101-S103.

Step S101: The original base station that the user terminal UE accesses sends, to the at least one target base station, an automatic handover preparation request that carries at least the context information of the UE and the target cell indication information, where the target cell indication information is used to indicate the The at least one target base station performs automatic handover admission control on the UE according to the target cell indication information, where context information of the UE is used to indicate that the at least one target base station saves the context of the UE in at least one second target cell. information.

In this step, the original base station that the UE accesses (that is, the base station that the UE accesses before the automatic handover) sends an automatic handover preparation request to the at least one target base station, where the at least one target base station is requested to be the UE. The automatic switching is ready. The original base station may send the automatic handover preparation request to the at least one target base station when the UE accesses the original base station, or may reach the at least one target after receiving the measurement report reported by the UE. The base station sends the automatic handover preparation request, and may also send an automatic handover preparation request to the at least one target base station every preset time after the UE accesses the original base station. It should be noted that the foregoing is only an example of the manner in which the original base station is triggered to send an automatic handover preparation request to the at least one target base station, and is not limited thereto.

The at least one target base station may be determined by the original base station according to the measurement report reported by the UE, for example, determining one or more cells whose signal quality is greater than a threshold according to the measurement report reported by the UE, and then determining the one or The base station corresponding to the multiple cells is the target base station. The at least one target base station may also be determined by the original base station according to the mobility regularity of the UE. For example, the original base station may determine one or more that the UE is about to enter according to the mobility regularity of the UE. The cell then determines that the base station corresponding to the one or more cells is the target base station. Of course, it can be understood that the manner of determining the at least one target base station may also be a combination of the foregoing two manners. It should be noted that the foregoing manner of determining the at least one target base station is merely an example, and the disclosure does not specifically limit this.

The automatic handover preparation request carries at least the context information of the UE and the target cell indication information, where the target cell indication information is used to indicate that the at least one target base station automatically performs handover and accepting the UE in the at least one target cell. control. The original base station may select the same target base station or target cell or the same target base station and target cell for different UEs, or may select different target base stations or different target cells or different target base stations and target cells for different UEs. . For example, the original base station may select different target base stations or different target cells or different target base stations and target cells for different UEs according to different cells currently accessed by the UE, or may be measured according to each UE. The measurement results included in the report select different target base stations or different target cells or different target base stations and target cells for each UE. In some embodiments of the present disclosure, the original base station may first select a target cell for the UE, and then determine a base station to which the target cell belongs as a target base station.

The target cell indication information includes at least one or more cell identifiers of the target cell. As shown in FIG. 2, the at least one target base station automatically switches the UE in at least one target cell according to the target cell indication information. Admission control. Each of the at least one target base station may include at least one of the one or more target cells, or may not include any of the one or more target cells. For a target base station H, when receiving the automatic handover preparation request carrying the target cell indication information, the target base station H acquires a cell identifier in the target cell indication information, and then determines the at least one Whether the target cell belongs to the target base station H in the target cell, and if the target cell does not belong to the target base station H in the at least one target cell indicated by the target cell indication information (for example, in a specific implementation, the target cell indication information is not Instructing any target cell, the target base station H does not perform automatic handover admission control on the UE; if the target cell h in the at least one target cell indicated by the target cell indication information belongs to the target base station H, the target base station H performs automatic handover admission control for the UE in the target cell h.

The context information of the UE is used to indicate that the at least one target base station saves context information of the UE in at least one second target cell. Specifically, for the foregoing target base station H, if the target cell does not belong to the target base station H in the at least one target cell indicated by the target cell indication information (for example, in a specific implementation, the target cell indication information does not indicate any Target cell), the target base station H indicates that all cells belonging to the target base station H save context information of the UE, but do not perform automatic handover admission control for the UE; if the target cell indicates at least one target indicated by the information If the target cell h belongs to the target base station H, the target base station H instructs the target cell h to save the context information of the UE, and performs automatic handover admission control for the UE in the target cell h.

The context information of the UE includes one or more of the following: security capability information of the UE, access network security key information, E-RAB (Evolved Radio Access Bearer) bearer information of the UE, The handover restriction list and RRC context information of the UE are described. The RRC context information includes at least capability information of the UE. In some embodiments of the present disclosure, the RRC context information may further include one or more of the following: an access layer configuration (AS-Config), a radio resource management configuration (RRM-Config), and an access layer context (AS). -Context). The access stratum context includes re-establishment information for the UE of the at least one re-establishment target cell for each of the at least one target base station. The access layer configuration includes all air interface configuration information of the UE in the original cell, such as a measurement configuration, a cell radio network temporary identifier C-RNTI, an original cell DL-EARFCN, a radio resource configuration, a main information block (MIB), and a system. Message SIB1/SIB2 and the number of original cell ports.

In some embodiments of the present disclosure, the automatic handover preparation request may further carry bearer information of an evolved radio access bearer E-RAB that is required to be received by the at least one target base station, for requesting the at least one target base station. Determining whether to accept the bearer information of the E-RAB that needs to be accepted.

Step S102: The original base station receives an automatic handover preparation response message sent by the at least one target base station.

In this step, the original base station receives an automatic handover preparation response message sent by the at least one target base station. Specifically, after the original base station sends the automatic handover preparation request to the at least one target base station, the at least one target base station may indicate at least one target cell according to the target cell indication information in the automatic handover preparation request. The UE performs automatic handover admission control, and the at least one target base station carries the first target cell information that successfully accepts the UE for automatic handover in the automatic handover preparation response message, and the original base station receives the automatic The handover preparation response message can learn the first target cell information that successfully accepts the UE for automatic handover.

In the embodiment of the present disclosure, for a target base station, the first target cell information carried in the automatic handover preparation request sent by the original base station may be the first target for successfully accepting the UE for automatic handover. The cell identifier of the cell may also be information that the one or more target cells indicated by the target cell indication message succeeds that the UE performs automatic handover. For example, for the target base station H, if no target cell of the one or more target cells indicated by the target cell indication information belongs to the target base station H, the first target cell that the target base station H sends to the original base station The information may be that the original base station does not have a cell successfully accepting the UE for automatic handover under the target base station H. If the target cell h of the one or more target cells indicated by the target cell indication information belongs to the target base station H, the target base station H instructs the target cell h to perform automatic handover admission control for the UE, if the target If the cell h successfully accepts the UE for automatic handover, the target base station H may send the first target cell information carrying the cell identifier of the target cell h to the original base station; or, for only one target cell h belongs to the In the case of the target base station H, the first target cell information may be information carrying only "yes/success" or "no/failure", for example.

In the embodiment of the present disclosure, the manner in which the at least one target base station determines whether the automatic handover admission control of the UE in the target cell is successful may be the following manner, that is, if a target cell belongs to any of the following conditions: And the at least one target base station determines that the admission control failure of the UE in the target cell fails: a) the target cell does not support the public land mobile network PLMN service of the UE; or b) the target cell support The PLMN service of the UE belongs to the forbidden tracking area forbidden to the UE handover restriction list; or c) the target cell cannot successfully accept the evolved radio access bearer E that does not provide the lowest transmission rate guarantee non-GBR type - RAB bearer; or d) the target base station fails to reserve the cell radio network temporary identity C-RNTI for the UE in the target cell; or f) the target base station is the UE in the target cell The dedicated random access channel RACH resource is reserved and the air interface radio resource is reserved.

Step S103: If the automatic handover preparation response message sent by the at least one target base station includes the first target cell information that successfully accepts the UE for automatic handover, the original base station sends an automatic handover configuration information to the UE. The automatic handover configuration information includes at least a cell identifier of the first target cell.

In this step, the original base station sends automatic handover configuration information to the UE after receiving the automatic handover preparation response message sent by the at least one target base station. Specifically, the original base station may determine, according to the received automatic handover preparation response message, a cell identifier of the first target cell that successfully accepts the UE to perform automatic handover, and then in the automatic handover configuration information sent to the UE. Carrying a cell identifier of the first target cell. In this way, the UE can know whether the target cell successfully performs the automatic handover of the UE before the automatic handover, so that the UE optimizes the target cell selection of the automatic handover, thereby reducing the automatic handover delay.

In some embodiments of the present disclosure, when the automatic handover preparation request carries the bearer information of the E-RAB that is required to be received by the at least one target base station, the at least one target base station determines (i) the accepted E-RAB. Carrying and (ii) rejecting at least one of the E-RAB bearers, and then indicating to the original base station by the automatic handover preparation response message, to facilitate wireless between the original base station and the at least one target base station Communication.

Optionally, the first target cell information includes RRC resource configuration information of the first target cell to the UE.

In some embodiments of the present disclosure, the automatic handover configuration information may also carry the RRC resource configuration information of the first target cell to the UE, or may not carry the RRC resource of the first target cell to the UE. Configuration information.

Optionally, the RRC resource configuration information includes an RRC resource type configured by the first target cell for the UE, and the RRC resource type includes a first type to a fifth type.

The first type: public RRC resource configuration.

The second type: cell radio network temporary identification C-RNTI configuration.

The third type: C-RNTI configuration and air interface radio resource configuration.

The fourth type: C-RNTI configuration and dedicated random access channel RACH resource configuration.

The fifth type: C-RNTI configuration, air interface radio resource configuration, and dedicated RACH resource configuration.

In this embodiment, the RRC resource configuration information includes an RRC resource type configured by the first target cell for the UE, for example, a first type: a common RRC resource configuration, that is, only a common RRC resource configuration is performed on the UE. The second type: C-RNTI configuration, that is, the first target cell reserves the C-RNTI only for the UE; the third type: the C-RNTI configuration and the air interface radio resource configuration, that is, the first target cell A C-RNTI and an air interface radio resource configuration are reserved for the UE; a fourth type: a C-RNTI configuration and a dedicated RACH resource configuration, that is, the first target cell reserves a C-RNTI and a dedicated RACH for the UE. The fifth type: the C-RNTI configuration, the air interface radio resource configuration, and the dedicated RACH resource configuration, that is, the first target cell reserves C-RNTI, air interface radio resource, and dedicated RACH resource for the UE.

In the embodiment of the present disclosure, the first target cell information may carry the specific content of the RRC resource configuration type, for example, a C-RNTI configuration, and may also carry only the code corresponding to the RRC resource configuration type, for example, The RRC resource configured by the first target cell for the UE is the third type described above.

It can be understood that, in the embodiment of the present disclosure, the automatic handover preparation request and the automatic handover preparation response message may be sent through an X2 interface, or may be sent through an S1 interface.

Optionally, the RRC resource configuration information of the first target cell to the UE includes at least one of a common RRC resource configuration information and a dedicated RRC resource configuration information, where the dedicated RRC resource configuration information includes at least the UE The C-RNTI in the first target cell.

In this embodiment, the RRC resource configuration information of the first target cell to the UE may be a public RRC resource configuration (Radio Resource Config Common) for the UE, or may be dedicated RRC only to the UE. The resource configuration may also be a common RRC resource configuration and a dedicated RRC resource configuration for the UE. The dedicated RRC resource includes at least a C-RNTI reserved by the first target cell for the UE.

The common RRC resource configuration information is used to transmit a system broadcast message of the target cell, where the dedicated RRC resource configuration information is used to indicate whether the first target cell successfully reserves a dedicated resource for the UE. If the first target cell successfully reserves the dedicated resource for the UE, the dedicated RRC resource configuration information may be further used to indicate that the first target cell is a dedicated resource configured by the UE. For example, the dedicated RRC resource configuration information may include a C-RNTI reserved by the first target cell for the UE, and may also include a dedicated RACH reserved for the UE in the first target cell. At least one of a resource and an air interface radio resource (eg, a physical layer dedicated channel resource, an air interface radio bearer resource).

Optionally, the dedicated RRC resource configuration information further includes one or more of the following: a dedicated RACH resource, an air interface radio resource, an evolved radio access bearer E-RAB bearer resource, and a security parameter.

Optionally, the manner in which the original base station sends the automatic handover configuration information to the UE includes any one of the following (i) and (ii): (i) from the S1 application protocol S1AP in the handover preparation response message. Obtaining, in the X2 application protocol X2AP field, the RRC resource configuration information configured by the first target cell for the UE, and generating an RRC message sent to the UE; and (ii) an S1AP or a handover preparation response message to be used The RRC transparent container Transparent Container field obtained in the X2AP field is sent to the UE by using an RRC message, where the Transparent Container field carries the RRC resource configuration information configured by the first target cell for the UE.

In this embodiment, the automatic handover preparation response message sent by the at least one target base station to the original base station further carries the RRC resource configuration information of the first target cell to the UE. The at least one target base station may send the RRC resource configuration information to the original base station in a plurality of different manners.

Specifically, the at least one target base station may put the RRC resource configured by the first target cell for the UE into the S1AP in the handover preparation response message by using an S1AP or X2AP field in the automatic handover preparation response message. The X2AP field is sent to the original base station. Correspondingly, the original base station obtains the RRC resource configuration information configured by the first target cell for the UE from the S1AP or X2AP field of the automatic handover preparation response message after receiving the automatic handover preparation response message, and generates an RRC. A message is sent to the UE.

In addition, the at least one target base station may also automatically switch the RRC transparent container field of the preparation response message, that is, the at least one target base station may put the RRC resource configuration of the first target cell to the UE in the automatic The RRC transparent container field of the handover preparation response message is sent to the original base station. The original base station receives the automatic handover preparation response message and sends an RRC transparent container field obtained from an S1AP or X2AP field of the automatic handover preparation response message to the UE by using an RRC message, where the RRC transparent container field The RRC resource configuration information configured by the first target cell for the UE is carried in the RRC resource configuration information. In an embodiment of the present disclosure, the at least one target base station may form an RRC message for the RRC resource configuration information configured for the UE in all the first target cells, and may also set the RRC resource of each first target cell. The configurations are respectively configured to form an RRC message, which is not specifically limited in this embodiment of the present disclosure.

Further, in other embodiments of the present disclosure, the at least one target base station may further send the automatic handover preparation response message to the original base station by using the combination of the foregoing two manners. For example, the at least one target base station may send the common RRC resource configuration information and the dedicated RRC resource configuration information in the S1AP or X2AP field in the automatic handover preparation response message to the original base station, and use other dedicated resources. (eg, dedicated RACH resources, air interface radio resources, etc.) are sent to the original base station in the RRC transparent container field in the automatic handover preparation response message.

Optionally, the manner in which the original base station sends the automatic handover configuration information to the UE includes: sending, by the original base station, one or more of the following information to the UE by using an RRC reconfiguration message: the first target cell a C-RNTI of the UE in the first target cell and the dedicated RACH resource in the cell identifier, the common RRC resource configuration information, and the dedicated RRC resource configuration information.

Optionally, the automatic handover configuration information includes at least a cell identifier of the first target cell and a cell identifier of the second target cell.

In this embodiment, the at least one target base station may instruct all cells or one or more target cells under the target base station to save context information of the UE according to the automatic handover preparation request. For the original base station, the automatic handover configuration information sent to the UE carries the cell identifier of the second target cell that stores the UE context information.

The original base station may directly determine a second target cell that saves the UE context information according to the automatic handover preparation request. Specifically, the original base station determines that all cells subordinate to the target base station H are second target cells that successfully save the UE context information.

Optionally, the context information of the UE includes one or more of the following: security capability information of the UE, access network security key information, E-RAB bearer information of the UE, and handover of the UE. a restriction list, RRC context information; wherein the RRC context information includes at least capability information of the UE.

Optionally, the RRC context information further includes one or more of the following: an access layer configuration, a radio resource management configuration, and an access layer context, where the access layer context is included in the at least one target base station. Re-establishment information for the UE of at least one re-establishment target cell under each target base station.

Optionally, before the sending, by the original base station, the automatic handover configuration information to the UE, the method further includes: if the context information of the UE carries the access layer context, the original base station determines The re-establishment target cell in the access layer context is a second target cell that saves the UE context information.

In this embodiment, before the sending, by the original base station, the automatic handover configuration information to the UE, the method further includes: if the context information of the UE carries the access layer context, the original The base station determines that the re-establishment target cell in the access layer context is a second target cell that stores context information of the UE. That is, in this embodiment, if the access layer context is carried in the context information of the UE, the original base station determines the second target cell according to the access layer context, that is, determining the location The re-establishment target cell in the access layer context is the second target cell.

The re-establishment information includes identity verification information (ShortMAC-I) of the UE in the re-establishment target cell and a key (KeNB) of the UE in the re-establishment target cell. In this embodiment, the re-establishment target cell includes the first target cell that successfully accepts the UE for automatic handover, that is, the set of the first target cell is equal to the set of the re-establishment target cell. Or the set of the first target cell is a subset of the set of re-established target cells. In some embodiments of the present disclosure, optionally, the re-establishment target cell supports a PLMN service of the UE or the re-establishment target cell not only supports the PLMN service of the UE but does not belong to the UE handover restriction list. Indicated prohibited tracking area.

In the embodiment of the present disclosure, optionally, if the automatic handover preparation response message sent by the at least one target base station received by the original base station does not include the first target cell information that successfully performs automatic handover admission control for the UE, the original base station sends the UE information to the UE. The automatically switched configuration information that is sent does not include the cell identifier and the RRC resource configuration of the first target cell, and only includes the cell identifier of the second target cell.

In an embodiment of the present disclosure, the UE receives the automatic handover configuration message, and may determine, according to the automatic handover configuration message, a target cell that needs to be handed over when automatic handover is required. A detailed description will be given below on how the UE performs automatic handover according to the automatic handover configuration message.

If the first target cell (that is, the cell in which the RRC resource is configured for the UE) has a target cell that meets the first automatic handover condition of the UE (eg, the signal quality is greater than the first threshold), the UE A target cell that performs automatic handover is selected in the first target cell. If the first target cell does not have a target cell that meets the first automatic handover condition of the UE, the UE selects to perform in the second target cell (ie, a cell that stores context information of the UE) The target cell that is automatically switched. If the second target cell has a target cell that meets the second automatic handover condition of the UE (for example, the signal quality is greater than the second threshold), the UE selects a target for automatic handover from the second target cell. Community. If the target cell that does not meet the handover condition of the UE is also not in the second target cell, the UE selects to meet the third automatic handover condition in the cell that does not have the context information of the UE (for example, the signal quality is greater than the first The three-threshold cell is used as the target cell for automatic handover.

Specifically, if the UE selects an automatically switched target cell in the first target cell, the target cell that is automatically switched may be selected according to the RRC resource type. For example, if a plurality of first target cells satisfy the first automatic handover condition of the UE, and the RRC resource types configured for the UE are different, the UE selects according to the following high to low priority order. A target cell that performs automatic switching: a fifth type, a fourth type, a third type, a second type, and a first type. If the UE selects a cell from the first target cell as the target cell for automatic handover, the UE applies the RRC resource configuration of the target cell to the UE, and applies the parameter in the RRC resource configuration. To the protocol layer of the UE (eg, PHY layer / MAC layer / RLC layer / PDCP layer / RRC layer).

If the UE selects a target cell that performs automatic handover in the second target cell, the UE determines whether the signal quality of the cell in the second target cell satisfies a second threshold and determines that the signal quality satisfies the Whether the cell of the second threshold is a suitable cell of the UE. That is, the UE selects, in the second target cell, a cell whose signal quality satisfies a second threshold and is a suitable cell of the UE as a target cell for automatic handover. The suitable cell of the UE is a cell that does not include a barred indication in the system broadcast message, supports a PLMN service of the UE or an equivalent PLMN (EPLMN), and the TA does not belong to the forbidden TA of the UE.

If the UE selects an automatically switched target cell in a cell that does not have context information of the UE, the UE determines whether the signal quality of the cell satisfies a third threshold and whether it is a suitable cell of the UE. That is, the condition that the UE selects the target cell for automatic handover in the cell that does not have the context information of the UE is that the signal quality of the cell satisfies a third threshold and the suitable cell of the UE. As above, the suitable cell of the UE is a cell that does not include a barred indication in the system broadcast message, supports a PLMN service of the UE or an equivalent PLMN (EPLMN), and the TA does not belong to the forbidden TA of the UE.

It should be noted that, in this embodiment, optionally, the first automatic switching condition, the second automatic switching condition, and the third automatic switching condition are configurations and measurements of the measurement report in the original base station by using a measurement configuration message. The at least one of the object configurations is sent to the UE, and the first automatic switching condition, the second automatic switching condition, and the third automatic switching condition may be the same or different. Optionally, the third threshold is greater than or equal to The second threshold, the second threshold is greater than or equal to the first threshold.

After determining the target cell that needs to be accessed, the UE sends an access request to request access to the target cell, and the manner in which the UE requests access to the target cell is described in detail in combination with several different situations. .

First, if the target cell that the UE determines to access is the cell in the first target cell, if the RRC resource configuration information of the first target cell to the UE includes a dedicated RRC resource configuration for the UE The information (including at least C-RNTI), the UE accesses the target cell through a random access procedure with C-RNTI and sends an automatic handover complete message to complete automatic handover. Specifically, if the target cell successfully reserves the C-RNTI and the air interface radio resource (the physical layer dedicated channel resource and the air interface radio bearer resource), the process and the traditional UE access the target cell The automatic switching process is the same, as shown in FIG. 3, and details are not described herein again. If the target cell only reserves the C-RNTI for the UE, the UE sends an automatic handover complete message to the target cell, and the base station to which the target cell belongs may initiate the RRC after receiving the automatic handover complete message. And reconfiguring the message to configure the air interface radio resource of the UE in the target cell.

If the target cell that needs to be accessed by the UE is a cell in the first target cell, but the RRC resource configuration information of the first target cell to the UE does not include dedicated RRC resource configuration information for the UE ( At least the C-RNTI is included, or the target cell that the UE determines to access is the cell in the second target cell, and the UE accesses the target cell by using an initial random access procedure. As shown in FIG. 4, similar to the related RRC re-establishment process, after the random access competition is successfully solved, the UE sends an automatic handover request message to the base station to which the target cell belongs, where the UE carries the automatic handover request message. The authentication information (Short MAC-I) of the UE. It should be noted that, in this case, since the target cell already has the context information (including the C-RNTI of the UE and the original cell physical cell identifier of the UE), the automatic handover request message is Only the identity verification message of the UE in the target cell may be carried. After receiving the automatic handover request message, the base station to which the target cell belongs compares the identity verification information of the UE with the identity verification information of the re-establishment information of the target cell in the context information of the UE, if And sending an automatic handover response message to the UE to notify the UE that the automatic handover is successful and apply the key in the re-establishment information for the target cell; otherwise, if the comparison is inconsistent, the automatic handover is sent to the UE. The message is rejected to notify the UE that the automatic handover fails. In some embodiments of the present disclosure, the base station to which the target cell belongs may also initiate an RRC reconfiguration message after the automatic handover response message is sent to the UE, and configure the air interface radio resource of the target cell in the target cell. .

If the target cell that the UE determines to access is neither the cell in the first target cell nor the cell in the second target cell, the UE accesses the target cell by using an initial random access procedure. The base station to which the target cell belongs needs to obtain the context information of the UE from the original base station of the UE. Specifically, as shown in FIG. 5, after the random access competition is successfully solved, the UE sends an automatic handover request message to the base station to which the target cell belongs, because the target cell does not have the context information of the UE, After receiving the automatic handover request message, the base station to which the target cell belongs acquires the C-RNTI of the original cell, the physical cell identifier of the original cell, and then sends a UE context request to the original base station of the UE to request the The original base station acquires the context information of the UE, where the UE context request carries at least the identifier of the original base station and the identifier of the UE in the original cell. The identifier of the UE in the original base station may be an X2AP identifier, a cell identifier of the UE in the original cell C-RNTI or an original cell (eg, a physical cell identifier or a cell global identifier ECGI (E-UTRAN cell global identifier)). The base station to which the target cell belongs compares the identity verification information of the UE with the identity verification information of the re-establishment information of the target cell in the UE context, and if the comparison is consistent, sends an automatic handover response to the UE. And applying the key of the UE in the re-establishment information of the target cell. Otherwise, if the comparison is inconsistent, an automatic handover reject message is sent to the UE. In some embodiments of the present disclosure, the base station to which the target cell belongs may also initiate an RRC reconfiguration message after the automatic handover response message is sent to the UE, and configure the air interface radio resource of the target cell in the target cell. .

In an embodiment of the present disclosure, the base station to which the target cell belongs is the original base station, after the base station to which the target cell belongs sends the automatic handover response message to the UE, regardless of the type of the target cell selected by the UE. The base station sends an automatic handover indication message for instructing the original base station to start data forwarding. The automatic handover indication message carries at least the identifier of the UE at the original base station. For example, the X2AP identifier described above, the UE in the original cell C-RNTI, or the cell identifier of the original cell, and the like.

In an embodiment of the present disclosure, the original base station accessed by the UE sends an automatic handover preparation request that carries at least one context information of the UE and target cell indication information to at least one target base station, where the target cell indication information is used. Instructing the at least one target base station to perform automatic handover admission control on the UE according to the target cell indication information, where context information of the UE is used to indicate that the at least one target base station saves the at least one second target cell Context information of the UE; the original base station receives an automatic handover preparation response message sent by the at least one target base station; and if the automatic handover preparation response message sent by the at least one target base station includes the method of successfully accepting the UE for automatic handover The target base station sends the automatic handover configuration information to the UE, where the automatic handover configuration information includes at least the cell identifier of the first target cell. In this way, the original base station that the UE accesses can indicate that the target base station performs automatic handover admission control on the UE before the automatic handover, and indicates the cell that successfully performs automatic handover admission control on the UE to the UE, so that the UE can automatically The target cell selection of the handover is optimized to reduce the handover delay.

Referring to FIG. 6, FIG. 6 is a schematic flowchart of an automatic handover preparation method according to an embodiment of the present disclosure. The execution body of the automatic handover preparation method is a target base station. As shown in FIG. 6, the method includes the following steps S601-S603.

Step S601: The target base station receives an automatic handover preparation request that is sent by the original base station accessed by the user terminal UE and carries at least the context information of the UE and the target cell indication information.

Step S602: The target base station performs automatic handover admission control on the UE according to the target cell indication information, and the target base station saves the context of the UE in at least one second target cell according to the context information of the UE. information.

Step S603: The target base station sends an automatic handover preparation response message to the original base station, where the automatic handover preparation response message includes successfully configuring the UE if the target base station successfully accepts the UE for automatic handover. First target cell information of the RRC resource. Optionally, before the target base station sends the automatic handover preparation response message to the original base station, the method further includes: determining, by the target base station, that the UE is automatically switched and accepted in the at least one target cell. Whether the control is successful. If the target cell belongs to any one of the following (1)-(5), the target base station determines that the automatic handover admission control fails for the UE in the target cell: (1) the target cell does not support the The public land mobile network (PLMN) service of the UE; (2) the target cell supports the PLMN service of the UE but belongs to the forbidden tracking area of the UE handover restriction list forbidden TA; (3) the target cell cannot successfully accept Providing a lowest transmission rate to ensure an evolved radio access bearer E-RAB bearer of a non-GBR type; (4) the target base station fails to reserve a cell radio network temporary identifier C-RNTI for the UE in the target cell (5) The target base station reserves a dedicated random access channel RACH resource for the UE in the target cell and fails to reserve air interface radio resources.

Optionally, the RRC resource configuration information includes an RRC resource type configured by the first target cell for the UE. The RRC resource type includes a first type to a fifth type.

The first type: public RRC resource configuration.

Optionally, the manner in which the target base station sends the automatic handover preparation response message to the original base station includes at least one of the following (1) and (2): (1) the first target cell is The RRC resource configured by the UE is sent to the original base station in an S1 application protocol S1AP or X2 application protocol X2AP field in the automatic handover preparation response message; and (2) the first target cell is the UE The configured RRC resource is sent to the original base station in an RRC transparent container Transparent Container field in the handover preparation response message.

Optionally, the RRC resource configuration of the UE by the target base station according to the target cell indication information includes: if the target cell indication information includes a cell identifier of at least one cell under the target base station, The target base station performs automatic handover admission control on the UE in the at least one target cell; and if the target cell indication information does not include the cell identifier of the cell under the target base station, the target base station does not The UE performs automatic handover admission control.

It should be noted that the embodiment shown in FIG. 6 may be the target base station side embodiment corresponding to the embodiment shown in FIG. 1. The related steps performed by the target base station may refer to the related description in the embodiment shown in FIG. I won't go into details here.

Referring to FIG. 7, FIG. 7 is a schematic flowchart diagram of an automatic handover preparation method according to an embodiment of the present disclosure. The execution body of the automatic handover preparation method is a UE. As shown in FIG. 7, the method includes the following steps S701-S702.

Step S701: The user terminal UE receives the automatic handover configuration information sent by the original base station.

Step S702: If the automatic handover configuration information includes at least a cell identifier of the first target cell that successfully accepts the UE for automatic handover, the UE selects an automatically switched target cell according to the automatic handover configuration information.

Optionally, the automatic handover configuration information further includes RRC resource configuration information of the first target cell to the UE.

Optionally, the automatic handover configuration information includes a cell identifier of the first target cell and a cell identifier of a second target cell that saves the UE context information.

And selecting, by the UE, the target cell that is automatically switched according to the automatic handover configuration information, including: the UE automatically selecting, according to the cell identifier of the first target cell and the cell identifier of the second target cell, in the automatic handover configuration information. The target cell of the handover.

The first type: public RRC resource configuration.

Optionally, the method further includes: if the automatic handover configuration information does not include a cell identifier of a first target cell that successfully accepts the UE to perform automatic handover, and the automatic handover configuration information includes the second target cell The UE identifies the target cell that is automatically switched according to the cell identifier of the second target cell in the automatic handover configuration information.

Optionally, the step of the UE selecting an automatically switched target cell according to the automatic handover configuration information includes: the UE preferentially selecting the first target cell as a target cell for automatic handover.

Optionally, if the UE selects the first target cell as the target cell for automatic handover according to the automatic handover configuration information, the method further includes: if the first target cell is an RRC resource to the UE The configuration information includes dedicated RRC resource configuration information for the UE, and the UE accesses the first target cell by using an automatic handover complete message to complete automatic handover; if the first target cell is used for the UE The RRC resource configuration information does not include dedicated RRC resource configuration information for the UE, and the UE accesses by sending an automatic handover request message carrying at least the identity verification information of the UE in the first target cell. The first target cell.

Optionally, the step of the UE selecting an automatically switched target cell according to the cell identifier of the first target cell and the cell identifier of the second target cell in the automatic handover configuration includes: the UE preferentially selecting the A target cell is used as the target cell for automatic handover; if the UE cannot select the first target cell as the target cell for automatic handover, the UE preferentially selects the second target cell as the target cell for automatic handover.

Optionally, the method further includes: if the UE selects the second target cell as the target cell for automatic handover according to the automatic handover configuration information, the UE transmits the UE by using the An automatic handover request message of the identity verification information in the two target cells accesses the second target cell.

Optionally, the step of the UE selecting an automatically switched target cell according to the cell identifier of the second target cell in the automatic handover configuration information includes: the UE preferentially selecting the second target cell as an automatic handover Target cell.

It should be noted that the embodiment shown in FIG. 7 may be a UE side embodiment corresponding to the embodiment shown in FIG. 1. The related steps performed by the UE may refer to the related description in the embodiment shown in FIG. Let me repeat.

Referring to FIG. 8, FIG. 8 shows a schematic structural diagram of an original base station. The original base station includes a first processor 800, a first transceiver 810, a first memory 820, a first user interface 830, and a first bus interface 840.

The first processor 800 is configured to read a program in the first memory 820, and perform the following process: sending, to the at least one target base station, context information of the UE that carries the access to the first base original base station, and a target cell An automatic handover preparation request indicating information, where the target cell indication information is used to indicate that the at least one target base station performs automatic handover admission control on the UE according to the target cell indication information, where context information of the UE is used. Instructing the at least one target base station to save context information of the UE in at least one second target cell; receiving an automatic handover preparation response message sent by the at least one target base station; and transmitting automatic handover configuration information to the UE, where If the automatic handover preparation response message sent by the at least one target base station includes the first target cell information that successfully accepts the UE for automatic handover, the automatic handover configuration information includes at least the cell identifier of the first target cell. .

Wherein, in FIG. 8, the first bus interface 840 can include any number of interconnected buses and bridges, specifically one or more processors represented by the first processor 800 and various circuits of the memory represented by the first memory 820. Linked together. The first bus interface 840 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is well known in the art, and therefore will not be further described herein. . The first bus interface 840 provides an interface. The first transceiver 810 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium. The first processor 800 is responsible for managing the first bus interface 840 and the usual processing, and the first memory 820 can store data used by the first processor 800 when performing operations.

The first type: public RRC resource configuration.

Optionally, the manner in which the first processor 800 sends the automatic handover configuration information to the UE includes at least one of the following (1) and (2): (1) from the automatic handover preparation response message. Obtaining, in the S1 application protocol S1AP or the X2 application protocol X2AP field, the RRC resource configuration information configured by the first target cell for the UE, and generating an RRC message to be sent to the UE; and (2) preparing for the automatic handover The RRC transparent container Transparent Container field obtained in the S1AP or X2AP field of the response message is sent to the UE by using an RRC message, where the Transparent Container field carries the RRC resource configuration information configured by the first target cell for the UE.

Optionally, the manner in which the first processor 800 sends the automatic handover configuration information to the UE includes: the processor 800 sends one or more of the following information to the UE by using an RRC reconfiguration message: a cell identifier of the first target cell, the common RRC resource configuration information, a C-RNTI of the UE in the first target cell, and the dedicated RACH resource in the dedicated RRC resource configuration information.

Optionally, before the first processor 800 sends the automatic handover configuration information to the UE, the method is further configured to: if the context information of the UE carries the access layer context, the original base station determines The re-establishment target cell in the access layer context is a second target cell that saves the UE context information.

Optionally, the first processor 800 is further configured to send the automatic handover configuration information to the UE, where the automatic handover preparation response message sent by the at least one target base station does not include automatically receiving the UE for automatic And switching the first target cell information, where the automatic handover configuration information includes a cell identifier of the second target cell.

It should be noted that the original base station in the embodiment shown in FIG. 8 may be the original base station in the embodiment shown in FIG. 1. Any embodiment of the original base station in the embodiment shown in FIG. 1 may be shown in FIG. The foregoing original base station in the embodiment is implemented, and the same beneficial effects are achieved, and details are not described herein again.

Referring to Figure 9, Figure 9 shows a structural entity diagram of the target base station. The target base station includes a second processor 900, a second transceiver 910, a second memory 920, a second user interface 930, and a second bus interface 940.

The second processor 900 is configured to read the program and data in the second memory 920 to perform the following process: receiving, by the original base station accessed by the user equipment UE, at least the context information carrying the UE and the target cell indication information Automatically switching the preparation request; performing automatic handover admission control on the UE according to the target cell indication information, and saving context information of the UE in the at least one second target cell according to the context information of the UE; The original base station sends an automatic handover preparation response message, wherein if the second base station successfully performs automatic handover admission control for the UE, the automatic handover preparation response message includes a first target that successfully accepts the UE for automatic handover. Cell information.

Wherein, in FIG. 9, the second bus interface 940 can include any number of interconnected buses and bridges, and in particular, various circuits of the memory represented by the one or more processors represented by the second processor 900 and the second memory 920. Linked together. The second bus interface 940 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art, and therefore will not be further described herein. . The second bus interface 940 provides an interface. The second transceiver 910 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium. The second processor 900 is responsible for managing the bus architecture and normal processing, and the second memory 920 can store data used by the second processor 900 when performing operations.

The second processor 900 is responsible for managing the bus interface and the usual processing, and the second memory 920 can store data used by the second processor 900 when performing operations.

Optionally, before the sending, by the second processor 900, the automatic handover preparation response message, the second processor 900 is further configured to: determine whether the automatic handover admission control of the UE is successful in the at least one target cell. . If the target cell belongs to any one of the following (1)-(5), the processor determines that the automatic handover admission control fails for the UE in the target cell: (1) the target cell does not Supporting the public land mobile network PLMN service of the UE; (2) the target cell supports the PLMN service of the UE but belongs to the forbidden tracking area forbidden TA of the UE handover restriction list; (3) the target cell cannot succeed Accepting an evolved radio access bearer E-RAB bearer that does not provide a minimum transmission rate guarantee non-GBR type; (4) the second base station reserves a cell radio network temporary identifier C for the UE in the target cell - RNTI fails; (5) the second base station reserves a dedicated random access channel RACH resource for the UE in the target cell and reserves air interface radio resources fails.

The first type: public RRC resource configuration.

Optionally, the manner in which the second processor 900 sends the automatic handover preparation response message to the original base station includes at least one of the following (1) and (2): (1) the first target The RRC resource configured by the cell for the UE is sent to the original base station in an S1 application protocol S1AP or X2 application protocol X2AP field in the automatic handover preparation response message; and (2) the first target cell is The RRC resource configured by the UE is sent to the original base station in an RRC transparent container Transparent Container field in the handover preparation response message.

Optionally, the step of the RRC resource configuration on the UE by the second processor 900 according to the target cell indication information includes: if the target cell indication information includes a cell of at least one cell under the target base station And the processor performs automatic handover admission control on the UE in the at least one target cell; and if the target cell indication information does not include a cell identifier of a cell under the target base station, The processor does not perform automatic handover admission control on the UE.

It should be noted that the target base station in the embodiment shown in FIG. 9 can be the target base station in the embodiment shown in FIG. 6, and any implementation manner of the target base station in the embodiment shown in FIG. 6 can be implemented as shown in FIG. The target base station in the example is implemented, and achieves the same beneficial effects, and details are not described herein again.

Referring to FIG. 10, FIG. 10 is a schematic structural diagram of a UE according to an embodiment of the present disclosure. As shown in FIG. 10, the UE includes a third processor 1000, a third transceiver 1010, a third memory 1020, a third user interface 1030, and a third bus interface 1040.

The third processor 1000 is configured to read a program in the third memory 1020, and perform the following process: receiving automatic switching configuration information sent by the source original base station; and if the automatic switching configuration information includes at least successfully receiving the UE for automatic switching The cell identifier of the first target cell is selected according to the automatic handover configuration information, and the target cell that is automatically switched is selected.

The third transceiver 1010 is configured to receive and transmit data under the control of the third processor 1000.

In FIG. 10, the third bus interface 1040 can include any number of interconnected buses and bridges, in particular the various circuits of the memory represented by the one or more processors represented by the third processor 1000 and the third memory 1020. together. The third bus interface 1040 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is well known in the art, and therefore will not be further described herein. . The third bus interface 1040 provides an interface. The third transceiver 1010 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium. For different user equipments, the third user interface 1030 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

The third processor 1000 is responsible for managing the bus architecture and normal processing, and the third memory 1020 can store data used by the third processor 1000 when performing operations.

Optionally, the automatic handover configuration information includes a cell identifier of the first target cell and a cell identifier of a second target cell that saves the UE context information. The third processor 1000 selects the target cell that is automatically switched according to the automatic handover configuration information, including: selecting, according to the cell identifier of the first target cell and the cell identifier of the second target cell, in the automatic handover configuration information. The target cell that is automatically switched.

The first type: public RRC resource configuration.

Optionally, the third processor 1000 is further configured to: if the automatic handover configuration information does not include a cell identifier of a first target cell that successfully accepts the UE to perform automatic handover, and the automatic handover configuration information includes And determining, by the cell identifier of the second target cell, the target cell that is automatically switched according to the cell identifier of the second target cell in the automatic handover configuration information.

Optionally, the step of the third processor 1000 selecting the target cell that is automatically switched according to the automatic handover configuration information includes: preferentially selecting the first target cell as a target cell for automatic handover.

Optionally, the third processor 1000 selects the first target cell as the target cell for automatic handover according to the automatic handover configuration information, and is further configured to: if the first target cell uses the RRC resource of the UE The configuration information includes dedicated RRC resource configuration information for the UE, where the third processor accesses the first target cell by sending an automatic handover complete message to complete automatic handover; and if the first target cell pair The RRC resource configuration information of the UE does not include the dedicated RRC resource configuration information for the UE, and the processor automatically transmits the identity verification information that carries at least the UE in the first target cell. The request message accesses the first target cell.

Optionally, the step that the third processor 1000 selects the automatically switched target cell according to the cell identifier of the first target cell and the cell identifier of the second target cell in the automatic handover configuration includes: preferentially selecting the The first target cell is used as the target cell for automatic handover. If the third processor cannot select the first target cell as the target cell for automatic handover, the second target cell is preferentially selected as the target cell for automatic handover.

Optionally, the third processor 1000 is further configured to: if the third processor selects the second target cell as the target cell for automatic handover according to the automatic handover configuration information, An automatic handover request message of the identity verification information of the UE in the second target cell accesses the second target cell.

Optionally, the step of the third processor 1000 selecting an automatically switched target cell according to the cell identifier of the second target cell in the automatic handover configuration information includes: preferentially selecting the second target cell as an automatic handover Target cell.

It should be noted that the foregoing UE in the embodiment shown in FIG. 10 may be the UE in the embodiment shown in FIG. 7. Any embodiment of the UE in the embodiment shown in FIG. 7 may be the foregoing in the embodiment. The UE implements and achieves the same beneficial effects, and details are not described herein again.

Referring to FIG. 11, FIG. 11 is a schematic structural diagram of an original base station. The original base station includes: a first sending module 1101, configured to send, to the at least one target base station, an automatic handover preparation request that carries at least the context information of the user terminal UE that accesses the original base station and the target cell indication information, where The target cell indication information is used to indicate that the at least one target base station performs automatic handover admission control on the UE according to the target cell indication information, where context information of the UE is used to indicate that the at least one target base station is in at least one second Storing the context information of the UE in the target cell; the first receiving module 1102 is configured to receive an automatic handover preparation response message sent by the at least one target base station; and the first determining module 1103 is configured to determine the at least one target base station Whether the sent automatic handover preparation response message includes the first target cell information that successfully accepts the UE for automatic handover, where the automatic handover preparation response message sent by the at least one target base station includes the first to successfully accept the UE for automatic handover. a target cell information, then the first transmission The module 1101 sends automatic handover configuration information to the UE, where the automatic handover configuration information includes at least a cell identifier of the first target cell.

The first type: public RRC resource configuration.

Optionally, the manner in which the first sending module 1101 sends the automatic handover configuration information to the UE includes at least one of the following (1) and (2): (1) from the automatic handover preparation response message. Obtaining, in the S1 application protocol S1AP or the X2 application protocol X2AP field, the RRC resource configuration information configured by the first target cell for the UE, and generating an RRC message to be sent to the UE; and (2) preparing for the automatic handover The RRC transparent container Transparent Container field obtained in the S1AP or X2AP field of the response message is sent to the UE by using an RRC message, where the Transparent Container field carries the RRC resource configuration information configured by the first target cell for the UE.

Optionally, the first sending module 1101 sends the automatic switching configuration information to the UE, where the first sending module 1101 sends one or more of the following information to the UE by using an RRC reconfiguration message: a cell identifier of the first target cell, the common RRC resource configuration information, and a C-RNTI of the UE in the first target cell and the dedicated RACH resource in the dedicated RRC resource configuration information.

Optionally, before the first sending module 1101 sends the automatic switching configuration information to the UE, the first determining module 1103 is further configured to: if the context information of the UE carries the access layer context And determining, by the re-establishment target cell in the access layer context, a second target cell that saves the UE context information.

Optionally, the first sending module 1101 is further configured to send the automatic handover configuration information to the UE, where the automatic handover preparation response message sent by the at least one target base station does not include automatically receiving the UE for automatic The first target cell information that is switched, the automatic handover configuration information includes a cell identifier of the second target cell.

It should be noted that the original base station in the embodiment shown in FIG. 11 may be the original base station in the embodiment shown in FIG. 1. Any embodiment of the original base station in the embodiment shown in FIG. 1 may be shown in FIG. The foregoing original base station in the embodiment is implemented, and the same beneficial effects are achieved, and details are not described herein again.

Referring to Figure 12, Figure 12 shows a structural entity diagram of a target base station. The target base station includes: a second receiving module 1201, configured to receive an automatic handover preparation request that is sent by the original base station that is accessed by the user terminal UE and that carries the context information of the UE and the target cell indication information; the first configuration module 1202, The first saving module 1203 is configured to save the context information of the UE in the at least one second target cell according to the context information of the UE, where the UE performs automatic handover admission control according to the target cell indication information. And the second sending module 1204 is configured to send an automatic handover preparation response message to the original base station, where the automatic handover preparation response message includes successfully accepting the automatic handover request response message if the target base station successfully accepts the UE for automatic handover. The UE performs first target cell information that is automatically switched.

Optionally, the target base station further includes a second determining module 1205. The second determining module 1205 is configured to: before the second sending module 1204 sends the automatic handover preparation response message to the original base station, determine to perform automatic handover admission control on the UE in the at least one target cell. whether succeed. If the target cell belongs to any one of the following (1)-(5), the second determining module 1205 determines that the automatic handover admission control fails for the UE in the target cell: (1) The target cell does not support the public land mobile network PLMN service of the UE; (2) the target cell supports the PLMN service of the UE but belongs to the forbidden tracking area of the UE handover restriction list forbidden TA; (3) the target The cell cannot successfully accept the evolved radio access bearer E-RAB bearer that does not provide the lowest transmission rate guarantee non-GBR type; (4) the second base station reserves the cell radio network temporary for the UE in the target cell The C-RNTI fails to be identified; (5) the second base station reserves a dedicated random access channel RACH resource for the UE in the target cell and fails to reserve air interface radio resources.

The first type: public RRC resource configuration.

Optionally, the manner in which the second sending module 1204 sends the automatic handover preparation response message to the original base station includes at least one of the following (1) and (2): (1) the first target The RRC resource configured by the cell for the UE is sent to the original base station in an S1 application protocol S1AP or X2 application protocol X2AP field in the automatic handover preparation response message; and (2) the first target cell is The RRC resource configured by the UE is sent to the original base station in an RRC transparent container Transparent Container field in the handover preparation response message.

Optionally, the first configuration module 1202 performs automatic handover admission control on the UE according to the target cell indication information, including: if the target cell indication information includes a cell identifier of at least one cell under the target base station The first configuration module 1202 performs automatic handover admission control on the UE in the at least one target cell; and if the target cell indication information does not include the cell identifier of the cell under the target base station, The first configuration module 1202 does not perform automatic handover admission control on the UE.

It should be noted that the target base station in the embodiment shown in FIG. 12 can be the target base station in the embodiment shown in FIG. 6, and any implementation manner of the target base station in the embodiment shown in FIG. 6 can be implemented as shown in FIG. The target base station in the example is implemented, and achieves the same beneficial effects, and details are not described herein again.

Referring to FIG. 13, FIG. 13 is a schematic structural diagram of a UE according to an embodiment of the present disclosure. As shown in FIG. 13, the UE includes: a third receiving module 1301 configured to receive automatic switching configuration information sent by the original base station; and a third determining module 1302 configured to determine whether the automatic switching configuration information includes successfully receiving the The cell identifier of the first target cell that is automatically switched by the UE; and the first selecting module 1303, configured to: when the automatic handover configuration information includes the cell identifier of the first target cell that successfully accepts the UE for automatic handover And selecting, according to the automatic switching configuration information, a target cell that is automatically switched.

Optionally, the automatic handover configuration information includes a cell identifier of the first target cell and a cell identifier of a second target cell that saves the UE context information. The first selection module 1303 selects a target cell that is automatically switched according to the automatic handover configuration information, and includes: the first selection module 1303, according to the cell identifier of the first target cell in the automatic handover configuration information, and the The cell identifier of the two target cells selects the target cell that is automatically switched.

The first type: public RRC resource configuration.

Optionally, the first selection module 1303 is further configured to: if the automatic handover configuration information does not include a cell identifier of a first target cell that successfully accepts the UE to perform automatic handover, and the automatic handover configuration information includes And determining, by the cell identifier of the second target cell, the target cell that is automatically switched according to the cell identifier of the second target cell in the automatic handover configuration information.

Optionally, the first selection module 1303 is further configured to preferentially select the first target cell as a target cell for automatic handover.

Optionally, the user terminal further includes a first access module 1304, where the first access module 1304 is configured to: if the first target cell includes the pair of UEs in the RRC resource configuration information of the UE And the dedicated RRC resource configuration information is used to access the first target cell by using an automatic handover complete message to complete the automatic handover; and if the first target cell does not include the RRC resource configuration information of the UE The dedicated RRC resource configuration information of the UE accesses the first target cell by sending an automatic handover request message carrying at least the identity verification information of the UE in the first target cell.

Optionally, the first selection module 1303 is further configured to: preferentially select the first target cell as a target cell for automatic handover, and if the first target cell cannot be selected as a target cell for automatic handover, preferentially select The second target cell is used as a target cell for automatic handover.

Optionally, the first access module 1304 is further configured to: if the first selection module 1303 selects the second target cell as the target cell for automatic handover according to the automatic handover configuration information, An automatic handover request message of the identity verification information of the UE in the second target cell accesses the second target cell.

Optionally, the first selection module 1303 is further configured to: preferentially select the second target cell as a target cell for automatic handover.

It should be noted that the foregoing UE in the embodiment shown in FIG. 13 may be the UE in the embodiment shown in FIG. 7. Any embodiment of the UE in the embodiment shown in FIG. 7 may be the foregoing in the embodiment. The UE implements and achieves the same beneficial effects, and details are not described herein again.

In an embodiment provided by the present disclosure, the original base station accessed by the user terminal UE transmits, to the at least one target base station, an automatic handover preparation request that carries at least the context information of the UE and the target cell indication information, where the target cell indication The information is used to indicate that the at least one target base station performs automatic handover admission control on the UE according to the target cell indication information, where context information of the UE is used to indicate that the at least one target base station is in at least one second target cell. And storing, by the original base station, an automatic handover preparation response message sent by the at least one target base station; if the automatic handover preparation response message sent by the at least one target base station includes successfully receiving the UE for automatic And the original base station sends the automatic handover configuration information to the UE, where the automatic handover configuration information includes at least the cell identifier of the first target cell. In this way, the original base station that the UE accesses can indicate that the target base station performs automatic handover admission control on the UE before the automatic handover, and the cell that successfully accepts the UE to perform automatic handover is indicated to the UE, so that the UE can automatically switch. The target cell selection is optimized to reduce the handover delay.

In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

In addition, each functional unit in various embodiments of the present disclosure may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

It is to be understood that the phrase "one embodiment" or "an embodiment" or "an" or "an" Thus, "in one embodiment" or "in an embodiment" or "an" In addition, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In various embodiments of the present disclosure, it should be understood that the size of the serial numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present disclosure. The implementation process constitutes any limitation.

Additionally, the terms "system" and "network" are used interchangeably herein.

It should be understood that the term "and/or" herein is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist simultaneously. There are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

In the embodiments provided herein, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined from A. However, it should also be understood that determining B from A does not mean that B is determined solely from A, and that B can also be determined based on and/or other information.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present disclosure.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present disclosure.

In addition, each functional unit in various embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, a portion of the technical solution of the present disclosure that contributes in essence or to the related art or a part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several The instructions are for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present disclosure. The foregoing storage medium includes: a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, and the like, which can store program codes.

The above is only the specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the disclosure. It should be covered within the scope of protection of the present disclosure. Therefore, the scope of protection of the disclosure should be determined by the scope of the claims.

An embodiment of the present disclosure provides an A1, a handover preparation method, where the method includes: the original base station accessed by the user equipment UE transmits, to the at least one target base station, context information carrying at least the UE and a target cell. An automatic handover preparation request indicating information, where the target cell indication information is used to indicate that the at least one target base station performs radio resource control RRC resource configuration on the UE according to the target cell indication information, and context information of the UE And indicating that the at least one target base station saves context information of the UE in the at least one second target cell; the original base station receives an automatic handover preparation response message sent by the at least one target base station; if the at least one target The automatic handover preparation response message sent by the base station includes first target cell information for successfully configuring the RRC resource for the UE, and the original base station sends automatic handover configuration information to the UE, where the automatic handover configuration information includes at least the foregoing The cell identity of a target cell.

A2. The method of A1, wherein the first target cell information comprises RRC resource configuration information of the first target cell to the UE.

A3. The method according to A2, wherein the RRC resource configuration information includes an RRC resource type configured by the first target cell for the UE, and the RRC resource type includes: a first type: a public RRC resource. Configuration; second type: cell radio network temporary identifier C-RNTI configuration; third type: C-RNTI configuration and air interface radio resource configuration; fourth type: C-RNTI configuration and dedicated random access channel RACH resource configuration; Five types: C-RNTI configuration, air interface radio resource configuration, and dedicated RACH resource configuration.

A4. The method according to A2, wherein the RRC resource configuration information of the first target cell to the UE includes common RRC resource configuration information and/or dedicated RRC resource configuration information, and the dedicated RRC resource configuration information. At least the C-RNTI of the UE in the first target cell is included.

The method of the A4, wherein the dedicated RRC resource configuration information further includes one or more of the following: a dedicated RACH resource, an air interface radio resource, an evolved radio access bearer E-RAB bearer resource, Safety parameters.

The method of any one of A2 to A5, wherein the manner in which the original base station sends automatic handover configuration information to the UE includes: from an S1 application protocol S1AP in the automatic handover preparation response message or Acquiring RRC resource configuration information configured by the first target cell for the UE, and generating an RRC message to be sent to the UE; and/or S1AP or X2AP that will automatically prepare a preparation response message from the X2 application protocol X2AP field The RRC transparent container Transparent Container field obtained in the field is sent to the UE by using an RRC message, where the Transparent Container field carries an RRC message that the first target cell is the RRC resource configuration information configured by the UE.

A method according to A5, wherein the method for the original base station to send the automatic handover configuration information to the UE includes: the original base station passing the one or more of the following information in the RRC reconfiguration message. The mobility control information element Mobility Control Info is sent to the UE: the cell identifier of the first target cell, the common RRC resource configuration information, and the UE in the dedicated RRC resource configuration information is in the first target C-RNTI in the cell, the dedicated RACH resource.

The method of A1, wherein the automatic handover configuration information includes a cell identifier of the first target cell and a cell identifier of the second target cell.

A9. The method according to A8, wherein the context information of the UE comprises one or more of the following: security capability information of the UE, access network security key information, E- of the UE The RAB bearer information, the handover restriction list of the UE, and the RRC context information; wherein the RRC context information includes at least capability information of the UE.

The method of A9, wherein the RRC context information further includes one or more of the following: an access layer configuration, a radio resource management configuration, and an access layer context; wherein the access layer The context includes re-establishment information for the UE for at least one re-establishment target cell under each of the at least one target base station.

The method of the A10, the method of the A10, wherein, before the original base station sends the automatic handover configuration information to the UE, the method further includes: if the context information of the UE carries the access layer context And the original base station determines that the re-establishment target cell in the access layer context is a second target cell that saves the UE context information.

The method of A1, wherein the method further comprises: if the automatic handover preparation response message sent by the at least one target base station does not include the first target cell information that is configured to successfully configure the RRC resource for the UE And the original base station sends automatic handover configuration information to the UE, where the automatic handover configuration information includes a cell identifier of the second target cell.

B13. A handover preparation method, the method includes: the target base station receives an automatic handover preparation request that is sent by the original base station that is accessed by the user terminal UE, and that carries at least the context information of the UE and the target cell indication information;

The target base station performs radio resource control RRC resource configuration on the UE according to the target cell indication information, and the target base station saves context information of the UE in at least one second target cell according to the context information of the UE. The target base station sends an automatic handover preparation response message to the original base station, and if the target base station successfully performs RRC resource configuration for the UE, the automatic handover preparation response message includes successfully configuring RRC resources for the UE. First target cell information.

The method of B13, wherein, before the target base station sends the automatic handover preparation response message to the original base station, the method further includes: determining, by the target base station, the at least one target cell Whether the RRC resource configuration is successful for the UE; wherein, if the target cell belongs to any of the following conditions, the target base station determines that the RRC resource configuration fails for the UE in the target cell: the target cell does not support The public land mobile network PLMN service of the UE; or the target cell supports the PLMN service of the UE but belongs to the forbidden tracking area forbidden TA of the UE handover restriction list; or the target cell cannot successfully accept the lowest provided The transmission rate guarantees that the evolved radio access bearer E-RAB bearer of the non-GBR type; or the target base station fails to reserve the cell radio network temporary identifier C-RNTI for the UE in the target cell; or the target base station Reserving a dedicated random access channel RACH resource for the UE in the target cell and reserving the air interface radio resource fails.

The method of B13, wherein the first target cell information includes RRC resource configuration information of the first target cell to the UE.

The method of the B15, wherein the RRC resource configuration information includes an RRC resource type configured by the first target cell for the UE, and the RRC resource type includes: a first type: a public RRC resource Configuration; second type: cell radio network temporary identifier C-RNTI configuration; third type: C-RNTI configuration and air interface radio resource configuration; fourth type: C-RNTI configuration and dedicated random access channel RACH resource configuration; Five types: C-RNTI configuration, air interface radio resource configuration, and dedicated RACH resource configuration.

The method of B15, wherein the RRC resource configuration information of the first target cell to the UE includes common RRC resource configuration information and/or dedicated RRC resource configuration information, and the dedicated RRC resource configuration information. At least the C-RNTI of the UE in the first target cell is included.

The method of the B17, wherein the dedicated RRC resource configuration information further includes one or more of the following: a dedicated RACH resource, an air interface radio resource, an evolved radio access bearer E-RAB bearer resource, Safety parameters.

The method of any one of B15 to B18, wherein the method for the target base station to send the automatic handover preparation response message to the original base station comprises: using the first target cell as the UE The configured RRC resource is sent to the original base station in an S1 application protocol S1AP or X2 application protocol X2AP field in the automatic handover preparation response message; and/or an RRC configured by the first target cell as the UE The resource is encapsulated into an RRC message and sent to the original base station in an RRC transparent container Transparent Container field in the handover preparation response message.

The method of B13, wherein the step of performing RRC resource configuration on the UE by the target base station according to the target cell indication information includes: if the target cell indication information includes the target base station The cell identifier of the at least one cell, the target base station performs RRC resource configuration on the UE in the at least one target cell; if the target cell indication information does not include the cell identifier of the cell under the target base station, The target base station does not perform RRC resource configuration on the UE.

C21. A handover preparation method, where the method includes: the user terminal UE receives the automatic handover configuration information sent by the original base station; and if the automatic handover configuration information includes at least successfully configuring the radio resource control RRC resource for the UE The cell identifier of the first target cell, and the UE selects the target cell that is automatically switched according to the automatic handover configuration information.

The method of C21, wherein the automatic handover configuration information further includes RRC resource configuration information of the first target cell to the UE.

The method of C21 or C22, wherein the automatic handover configuration information includes a cell identifier of the first target cell and a cell identifier of a second target cell that saves the UE context information; Selecting the target cell for automatic handover according to the automatic handover configuration information, including: the UE selecting an automatic handover target according to the cell identifier of the first target cell and the cell identifier of the second target cell in the automatic handover configuration information Community.

The method of C22, wherein the RRC resource configuration information includes an RRC resource type configured by the first target cell for the UE, and the RRC resource type includes: a first type: a public RRC resource. Configuration; second type: cell radio network temporary identifier C-RNTI configuration; third type: C-RNTI configuration and air interface radio resource configuration; fourth type: C-RNTI configuration and dedicated random access channel RACH resource configuration; Five types: C-RNTI configuration, air interface radio resource configuration, and dedicated RACH resource configuration.

The method of C22, wherein the RRC resource configuration information of the first target cell to the UE includes common RRC resource configuration information and/or dedicated RRC resource configuration information, and the dedicated RRC resource configuration information. At least the C-RNTI of the UE in the first target cell is included.

The method of C25, wherein the dedicated RRC resource configuration information further includes one or more of the following: a dedicated RACH resource, an air interface radio resource, an evolved radio access bearer E-RAB bearer resource, Safety parameters.

The method of C21, wherein the method further comprises: if the automatic handover configuration information does not include a cell identifier of a first target cell that successfully configures an RRC resource for the UE, and the automatic handover The configuration information includes a cell identifier of the second target cell, and the UE selects an automatically switched target cell according to the cell identifier of the second target cell in the automatic handover configuration information.

The method of C21, wherein the step of the UE selecting the automatically switched target cell according to the automatic handover configuration information comprises: the UE preferentially selecting the first target cell as a target cell for automatic handover. .

The method of C22, wherein, if the UE selects the first target cell as the target cell for automatic handover according to the automatic handover configuration information, the method further includes: if the first target The RRC resource configuration information of the UE to the UE includes the C-RNTI of the UE in the first target cell, and the UE accesses the first target cell by sending an automatic handover complete message to complete automatic handover; The RRC resource configuration information of the first target cell to the UE does not include the C-RNTI of the UE in the first target cell, and the UE transmits at least the UE in the first target by sending An automatic handover request message of the identity verification information in the cell accesses the first target cell.

The method of C23, wherein the step of selecting, by the UE, the automatically switched target cell according to the cell identifier of the first target cell and the cell identifier of the second target cell in the automatic handover configuration comprises: The UE preferentially selects the first target cell as a target cell for automatic handover, and if the UE cannot select the first target cell as a target cell for automatic handover, the UE preferentially selects the second target cell. As the target cell for automatic handover.

The method of C23 or C27, wherein the method further comprises: if the UE selects the second target cell as a target cell for automatic handover according to the automatic handover configuration information, the UE passes And sending an automatic handover request message carrying the identity verification information of the UE in the second target cell to access the second target cell.

The method according to C27, wherein the step of the UE selecting an automatically switched target cell according to the cell identifier of the second target cell in the automatic handover configuration information comprises: the UE preferentially selecting a location The second target cell is used as a target cell for automatic handover.

D33. A first base station, where the first base station is an original base station, where the first base station includes a processor, a transceiver, a memory, a user interface, and a network interface, where the processor is configured to: at least one The target base station sends an automatic handover preparation request that carries at least the context information of the UE that accesses the first base station and the target cell indication information, where the target cell indication information is used to indicate that the at least one target base station is configured according to the The target cell indication information is used to perform radio resource control RRC resource configuration on the UE, and the context information of the UE is used to indicate that the at least one target base station saves context information of the UE in at least one second target cell; An automatic handover preparation response message sent by the at least one target base station; and the automatic handover configuration information is sent to the UE, where the automatic handover preparation response message sent by the at least one target base station includes successfully configuring the RRC resource for the UE. First target cell information, where the automatic handover configuration information includes at least the first target Area cell identity.

D34. The first base station according to D33, wherein the first target cell information includes RRC resource configuration information of the first target cell to the UE.

D35. The first base station according to D34, wherein the RRC resource configuration information includes an RRC resource type configured by the first target cell for the UE, and the RRC resource type includes: a first type: a public RRC resource configuration; second type: cell radio network temporary identity C-RNTI configuration; third type: C-RNTI configuration and air interface radio resource configuration; fourth type: C-RNTI configuration and dedicated random access channel RACH resource configuration; And the fifth type: C-RNTI configuration, air interface radio resource configuration, and dedicated RACH resource configuration.

D36. The first base station according to D34, wherein the RRC resource configuration information of the first target cell to the UE includes common RRC resource configuration information and/or dedicated RRC resource configuration information, where the dedicated RRC resource is used. The configuration information includes at least a C-RNTI of the UE in the first target cell.

D37. The first base station according to D36, wherein the dedicated RRC resource configuration information further includes one or more of the following: a dedicated RACH resource, an air interface radio resource, and an evolved radio access bearer E-RAB bearer. Resources, security parameters.

The first base station according to any one of D34 to D37, wherein the manner in which the processor sends the automatic handover configuration information to the UE comprises: an S1 application protocol in the automatic handover preparation response message. Acquiring RRC resource configuration information configured by the first target cell for the UE in an S1AP or X2 application protocol X2AP field, and generating an RRC message to be sent to the UE; and/or an S1AP that will automatically prepare a preparation response message from the handover Or the RRC transparent container Transparent Container field obtained in the X2AP field is sent to the UE by using an RRC message, where the Transparent Container field carries an RRC message that the first target cell is the RRC resource configuration information configured by the UE.

D39. The first base station according to D37, wherein the manner in which the processor sends the automatic handover configuration information to the UE comprises: the processor adopting one or more of the following information to pass the RRC reconfiguration message. The mobility control information unit Mobility Control Info is sent to the UE: the cell identifier of the first target cell, the common RRC resource configuration information, and the UE in the dedicated RRC resource configuration information is in the a C-RNTI in a target cell, the dedicated RACH resource.

D40. The first base station according to D33, wherein the automatic handover configuration information includes a cell identifier of the first target cell and a cell identifier of the second target cell.

The first base station according to D40, wherein the context information of the UE includes one or more of the following: security capability information of the UE, access network security key information, and the UE E-RAB bearer information, a handover restriction list of the UE, and RRC context information; wherein the RRC context information includes at least capability information of the UE.

The first base station according to D41, wherein the RRC context information further includes one or more of the following: an access layer configuration, a radio resource management configuration, and an access layer context; wherein the The inbound layer context includes re-establishment information for the UE for at least one re-establishment target cell under each of the at least one target base station.

The first base station according to D42, wherein, before the sending the automatic handover configuration information to the UE, the processor is further configured to: if the context information of the UE carries the access layer context And the original base station determines that the re-establishment target cell in the access layer context is a second target cell that saves the UE context information.

The first base station according to D33, wherein the processor is further configured to: send automatic handover configuration information to the UE, where, if the at least one target base station sends an automatic handover preparation response message, The first target cell information that successfully configures the RRC resource for the UE is not included, and the automatic handover configuration information includes a cell identifier of the second target cell.

E45. A second base station, where the second base station is a target base station, where the second base station includes a processor, a transceiver, a memory, a user interface, and a network interface, where the processor is configured to: receive a user terminal. An automatic handover preparation request that carries the context information of the UE and the target cell indication information that is sent by the original base station that is accessed by the UE; performs radio resource control RRC resource configuration on the UE according to the target cell indication information, and The context information of the UE is used to store the context information of the UE in the at least one second target cell; the automatic handover preparation response message is sent to the original base station, and if the second base station successfully performs RRC resource configuration for the UE, The automatic handover preparation response message includes first target cell information that successfully configures the RRC resource for the UE.

The second base station according to E45, wherein before the sending, by the processor, the automatic handover preparation response message to the original base station, the method is further configured to: determine, in the at least one target cell, the Whether the RRC resource configuration is successful by the UE; wherein, if the target cell belongs to any of the following conditions, the processor determines that the RRC resource configuration fails to be performed on the UE in the target cell: the target cell does not support the UE Public land mobile network PLMN service; or the target cell supports the PLMN service of the UE but belongs to the forbidden tracking area forbidden TA of the UE handover restriction list; or the target cell cannot successfully accept the lowest transmission rate guarantee non The evolved radio access of the GBR type carries the E-RAB bearer; or the second base station fails to reserve the cell radio network temporary identifier C-RNTI for the UE in the target cell; or the second base station is in the In the target cell, the dedicated random access channel RACH resource is reserved for the UE, and the air interface radio resource is reserved.

The second base station according to E45, wherein the first target cell information includes RRC resource configuration information of the first target cell to the UE.

The eNB, the RRC resource configuration information includes: the RRC resource type configured by the first target cell for the UE, where the RRC resource type includes: a first type: public RRC resource configuration; second type: cell radio network temporary identity C-RNTI configuration; third type: C-RNTI configuration and air interface radio resource configuration; fourth type: C-RNTI configuration and dedicated random access channel RACH resource configuration; And the fifth type: C-RNTI configuration, air interface radio resource configuration, and dedicated RACH resource configuration.

The second base station according to E47, wherein the RRC resource configuration information of the first target cell to the UE includes common RRC resource configuration information and/or dedicated RRC resource configuration information, and the dedicated RRC resource The configuration information includes at least a C-RNTI of the UE in the first target cell.

E50. The second base station according to E49, wherein the dedicated RRC resource configuration information further includes one or more of the following: a dedicated RACH resource, an air interface radio resource, and an evolved radio access bearer E-RAB bearer. Resources, security parameters.

The second base station according to any one of E47 to E50, wherein the method for the processor to send the automatic handover preparation response message to the original base station comprises: using the first target cell as a location The RRC resource configured by the UE is sent to the original base station in an S1 application protocol S1AP or X2 application protocol X2AP field in the automatic handover preparation response message; and/or the first target cell is configured for the UE The RRC resource is encapsulated into an RRC message and sent to the original base station in an RRC transparent container Transparent Container field in the handover preparation response message.

The second base station according to E45, wherein the step of performing RRC resource configuration on the UE according to the target cell indication information includes: if the target cell indication information includes the target a cell identifier of the at least one cell in the base station, where the processor performs RRC resource configuration on the UE in the at least one target cell; if the target cell indication information does not include the cell identifier of the cell under the target base station The processor does not perform RRC resource configuration on the UE.

F53, a user terminal UE, the UE includes a processor, a transceiver, a memory, a user interface, and a network interface, where the processor is configured to: receive automatic switching configuration information sent by the original base station; The automatic handover configuration information includes at least a cell identifier of a first target cell that successfully configures a radio resource control RRC resource for the UE, and selects a target cell that is automatically switched according to the automatic handover configuration information.

F54. The UE according to F53, wherein the automatic handover configuration information further includes RRC resource configuration information of the first target cell to the UE.

The UE according to F53 or F54, wherein the automatic handover configuration information includes a cell identifier of the first target cell and a cell identifier of a second target cell that saves the UE context information; The selecting the target cell for automatic handover according to the automatic handover configuration information includes: selecting, according to the cell identifier of the first target cell and the cell identifier of the second target cell in the automatic handover configuration information, an automatically switched target cell.

F56. The UE according to F54, wherein the RRC resource configuration information includes an RRC resource type configured by the first target cell for the UE, and the RRC resource type includes: a first type: a public RRC resource. Configuration; second type: cell radio network temporary identifier C-RNTI configuration; third type: C-RNTI configuration and air interface radio resource configuration; fourth type: C-RNTI configuration and dedicated random access channel RACH resource configuration; Five types: C-RNTI configuration, air interface radio resource configuration, and dedicated RACH resource configuration.

The UE according to the F54, wherein the RRC resource configuration information of the first target cell to the UE includes common RRC resource configuration information and/or dedicated RRC resource configuration information, and the dedicated RRC resource configuration information. At least the C-RNTI of the UE in the first target cell is included.

F58. The UE according to the F57, wherein the dedicated RRC resource configuration information further includes one or more of the following: a dedicated RACH resource, an air interface radio resource, an evolved radio access bearer E-RAB bearer resource, Safety parameters.

The UE of the F53, wherein the processor is further configured to: if the automatic handover configuration information does not include a cell identifier of a first target cell that successfully configures an RRC resource for the UE, and The automatic handover configuration information includes a cell identifier of the second target cell, and the target cell that is automatically switched is selected according to the cell identifier of the second target cell in the automatic handover configuration information.

F60. The UE according to F53, wherein the step of selecting, by the processor, the automatically switched target cell according to the automatic handover configuration information comprises: preferentially selecting the first target cell as a target cell for automatic handover.

F61. The UE according to F54, wherein the processor selects the first target cell as a target cell for automatic handover according to the automatic handover configuration information, and is further configured to: if the first target cell pair The RRC resource configuration information of the UE includes a C-RNTI of the UE in the first target cell, and the processor accesses the first target cell by sending an automatic handover complete message to complete automatic handover; The RRC resource configuration information of the first target cell to the UE does not include the C-RNTI of the UE in the first target cell, and the processor transmits at least the UE in the first target by sending An automatic handover request message of the identity verification information in the cell accesses the first target cell.

F62. The UE according to F55, wherein the step of selecting, by the processor, the automatically switched target cell according to the cell identifier of the first target cell and the cell identifier of the second target cell in the automatic handover configuration The method includes: preferentially selecting the first target cell as a target cell for automatic handover, and if the processor cannot select the first target cell as a target cell for automatic handover, preferentially selecting the second target cell as an automatic handover Target cell.

The UE according to F55 or F59, wherein the processor is further configured to: if the processor selects the second target cell as a target cell for automatic handover according to the automatic handover configuration information, And sending an automatic handover request message carrying the identity verification information of the UE in the second target cell to access the second target cell.

The UE of the F59, wherein the step of selecting, by the processor, the automatically switched target cell according to the cell identifier of the second target cell in the automatic handover configuration information comprises: preferentially selecting the The two target cells serve as target cells for automatic handover.

Claims

A handover preparation method includes:

The original base station that is accessed by the user equipment UE transmits, to the at least one target base station, an automatic handover preparation request that carries at least the context information of the UE and the target cell indication information, where the target cell indication information is used to indicate the at least one target. The eNB performs radio resource control RRC resource configuration on the UE according to the target cell indication information, where the context information of the UE is used to indicate that the at least one target base station saves context information of the UE in at least one second target cell. ;

Receiving, by the original base station, an automatic handover preparation response message sent by the at least one target base station;

If the automatic handover preparation response message sent by the at least one target base station includes the first target cell information that successfully accepts the UE for automatic handover, the original base station sends automatic handover configuration information to the UE, and the automatic handover configuration The information includes at least a cell identifier of the first target cell.
The method of claim 1, wherein the first target cell information comprises RRC resource configuration information of the first target cell to the UE.
The method according to claim 2, wherein the RRC resource configuration information includes an RRC resource type configured by the first target cell for the UE, and the RRC resource type includes a first type to a fifth type, where One type includes a common RRC resource configuration, the second type includes a cell radio network temporary identity C-RNTI configuration, the third type includes a C-RNTI configuration and an air interface radio resource configuration, and the fourth type includes a C-RNTI configuration and a dedicated random access channel. RACH resource configuration, the fifth type includes C-RNTI configuration, air interface radio resource configuration, and dedicated RACH resource configuration.
The method according to claim 2, wherein the RRC resource configuration information of the first target cell to the UE comprises at least one of a common RRC resource configuration information and dedicated RRC resource configuration information, the dedicated RRC resource configuration. The information includes at least a cell radio network temporary identifier C-RNTI of the UE in the first target cell.
The method according to claim 4, wherein the dedicated RRC resource configuration information further comprises one or more of the following: a dedicated random access channel RACH resource, an air interface radio resource, and an evolved radio access bearer E-RAB bearer. Resources, security parameters.
The method according to any one of claims 2 to 5, wherein the transmitting, by the original base station, the automatic handover configuration information to the UE comprises at least one of the following (i) and (ii):

(i) the original base station acquires, from the S1 application protocol S1AP or the X2 application protocol X2AP field in the automatic handover preparation response message, the RRC resource configuration information configured by the first target cell for the UE, and generates an RRC message. Sent to the UE; and

(ii) the original base station sends the RRC transparent container Transparent Container field obtained from the S1AP or X2AP field of the automatic handover preparation response message to the UE by using an RRC message, where the Transparent Container field carries the first The target cell is RRC resource configuration information configured by the UE.
The method of claim 5, wherein the sending, by the original base station, the automatic handover configuration information to the UE comprises: sending, by the original base station, one or more of the following information to the UE by using an RRC reconfiguration message:

a cell identifier of the first target cell, the common RRC resource configuration information, and a C-RNTI of the UE in the first target cell and the dedicated RACH resource in the dedicated RRC resource configuration information.
The method of claim 1, wherein the automatic handover configuration information comprises a cell identity of the first target cell and a cell identity of a second target cell.
The method of claim 8, wherein the context information of the UE comprises one or more of the following:

Security capability information of the UE, access network security key information, evolved radio access bearer E-RAB bearer information of the UE, handover restriction list of the UE, RRC context information; wherein the RRC context The information includes at least capability information of the UE.
The method of claim 9, wherein the RRC context information further comprises one or more of the following:

Access layer configuration, radio resource management configuration, access layer context;

The access layer context includes re-establishment information of the UE for at least one re-establishment target cell under each target base station in the at least one target base station.
The method of claim 10, wherein before the sending of the automatic handover configuration information by the original base station to the UE, the method further comprises:

If the context information of the UE carries the access layer context, the original base station determines that the re-establishment target cell in the access layer context is a second target cell that saves the UE context information.
The method of claim 1 further comprising:

If the automatic handover preparation response message sent by the at least one target base station does not include the first target cell information that successfully accepts the UE for automatic handover, the original base station sends automatic handover configuration information to the UE, where The automatic handover configuration information includes a cell identifier of the second target cell.
A handover preparation method includes:

The target base station receives an automatic handover preparation request that is sent by the original base station that is accessed by the user terminal UE and that carries at least the context information of the UE and the target cell indication information;

The target base station performs automatic handover admission control on the UE according to the target cell indication information, and the target base station saves context information of the UE in at least one second target cell according to context information of the UE;

The target base station sends an automatic handover preparation response message to the original base station, where the automatic handover preparation response message includes successfully receiving the UE for automatic handover, if the target base station successfully accepts the UE for automatic handover. First target cell information.
The method of claim 13, wherein the method further comprises: before the target base station sends the automatic handover preparation response message to the original base station, the method further comprising:

Determining, by the target base station, whether the automatic handover admission control of the UE is successful in the at least one target cell;

If the target cell of the at least one target cell belongs to any one of the following conditions, the target base station determines that the automatic handover admission control fails for the UE in the target cell: the target cell does not support the a public land mobile network PLMN service of the UE; or the target cell supports the PLMN service of the UE but belongs to the forbidden tracking area forbidden TA of the UE handover restriction list; or the target cell cannot successfully accept the lowest transmission Rate-guaranteeing the non-GBR type of evolved radio access bearer E-RAB bearer; or the target base station fails to reserve the cell radio network temporary identifier C-RNTI for the UE in the target cell; or the target base station Reserving a dedicated random access channel RACH resource for the UE in the target cell and reserving the air interface radio resource fails.
The method of claim 13, wherein the first target cell information comprises RRC resource configuration information of the first target cell to the UE.
The method according to claim 15, wherein the RRC resource configuration information includes an RRC resource type configured by the first target cell for the UE, and the RRC resource type includes a first type to a fifth type, where The first type includes a common RRC resource configuration, the second type includes a cell radio network temporary identifier C-RNTI configuration, and the third type includes a C-RNTI configuration and an air interface radio resource configuration, and the fourth type includes a C- RNTI configuration and dedicated random access channel RACH resource configuration, the fifth type includes C-RNTI configuration, air interface radio resource configuration, and dedicated RACH resource configuration.
The method according to claim 15, wherein the RRC resource configuration information of the first target cell to the UE comprises at least one of a common RRC resource configuration information and dedicated RRC resource configuration information, the dedicated RRC resource configuration. The information includes at least a C-RNTI of the UE in the first target cell.
The method of claim 17, wherein the dedicated RRC resource configuration information further comprises one or more of the following:

Dedicated RACH resources, air interface radio resources, evolved radio access bearer E-RAB bearer resources, and security parameters.
The method according to any one of claims 15 to 18, wherein the transmitting, by the target base station, the automatic handover preparation response message to the original base station comprises at least one of the following (i) and (ii):

(i) the target base station sends the RRC resource configured by the first target cell to the UE to the original base station in an S1 application protocol S1AP or an X2 application protocol X2AP field in the automatic handover preparation response message. ;with

(ii) The target base station sends the RRC resource configured by the first target cell to the UE to the original base station in an RRC transparent container Transparent Container field in the handover preparation response message.
The method of claim 13, wherein the automatic handover admission control of the UE by the target base station according to the target cell indication information comprises:

If the target cell indication information includes a cell identity of at least one cell under the target base station, the target base station performs automatic handover admission control on the UE in the at least one target cell;

If the target cell indication information does not include the cell identity of the cell under the target base station, the target base station does not perform automatic handover admission control on the UE.
A handover preparation method includes:

The user terminal UE receives the automatic handover configuration information sent by the original base station;

If the automatic handover configuration information includes at least a cell identifier of the first target cell that successfully accepts the UE for automatic handover, the UE selects an automatically switched target cell according to the automatic handover configuration information.
The method of claim 21, wherein the automatic handover configuration information further comprises RRC resource configuration information of the first target cell to the UE.
The method according to claim 21 or 22, wherein the automatic handover configuration information comprises a cell identifier of the first target cell and a cell identifier of a second target cell that saves the UE context information;

And selecting, by the UE, the target cell that is automatically switched according to the automatic handover configuration information, including: the UE automatically selecting, according to the cell identifier of the first target cell and the cell identifier of the second target cell, in the automatic handover configuration information. The target cell of the handover.
The method of claim 22, wherein the RRC resource configuration information includes an RRC resource type configured by the first target cell for the UE, and the RRC resource type includes a first type to a fifth type, where The first type includes a common RRC resource configuration, the second type includes a cell radio network temporary identifier C-RNTI configuration, and the third type includes a C-RNTI configuration and an air interface radio resource configuration, and the fourth type includes C - RNTI configuration and dedicated random access channel RACH resource configuration, the fifth type including C-RNTI configuration, air interface radio resource configuration, and dedicated RACH resource configuration.
The method according to claim 22, wherein the RRC resource configuration information of the first target cell to the UE includes at least one of a common RRC resource configuration information and dedicated RRC resource configuration information, the dedicated RRC resource configuration. The information includes at least a C-RNTI of the UE in the first target cell.
The method of claim 25, wherein the dedicated RRC resource configuration information further comprises one or more of the following: a dedicated random access channel RACH resource, an air interface radio resource, and an evolved radio access bearer E-RAB bearer. Resources, security parameters.
The method of claim 21 further comprising:

If the automatic handover configuration information does not include the cell identifier of the first target cell that successfully receives the automatic handover of the UE, and the automatic handover configuration information includes the cell identifier of the second target cell, the UE according to the The cell identifier of the second target cell in the automatic handover configuration information selects a target cell that is automatically switched.
The method of claim 21, wherein the selecting, by the UE, the target cell for automatic handover according to the automatic handover configuration information comprises:

The UE preferentially selects the first target cell as a target cell for automatic handover.
The method of claim 22, wherein if the UE selects the first target cell as the target cell for automatic handover according to the automatic handover configuration information, the method further includes:

If the RRC resource configuration information of the first target cell to the UE includes the dedicated RRC resource configuration information for the UE, the UE accesses the first target cell by sending an automatic handover complete message to complete the automatic process. Switch; and

If the RRC resource configuration information of the first target cell does not include the dedicated RRC resource configuration information for the UE, the UE transmits the at least the UE in the first target cell by sending The automatic handover request message of the authentication information accesses the first target cell.
The method of claim 23, wherein the UE selects the target cell that is automatically switched according to the cell identifier of the first target cell and the cell identifier of the second target cell in the automatic handover configuration, including:

Deselecting, by the UE, the first target cell as a target cell for automatic handover;

If the UE cannot select the first target cell as the target cell for automatic handover, the UE preferentially selects the second target cell as the target cell for automatic handover.
The method of claim 23 or 27, further comprising:

If the UE selects the second target cell as the target cell for automatic handover according to the automatic handover configuration information, the UE automatically sends the identity verification information that carries the UE in the second target cell. The handover request message accesses the second target cell.
The method of claim 27, wherein the UE selects an automatically switched target cell according to the cell identity of the second target cell in the automatic handover configuration information, including:

The UE preferentially selects the second target cell as a target cell for automatic handover.
a first base station, the first base station is an original base station and includes a processor, a memory, and a bus interface, and the processor and the memory are connected through the bus interface.

Wherein the memory is used to store programs and data stored by the processor when performing operations, and

The processor is configured to read programs and data stored in the memory to control the first base station to perform the method of any of claims 1-12.
a second base station, the second base station is a target base station and includes a processor, a memory, and a bus interface, where

The memory is configured to store programs and data stored by the processor when performing an operation, and

The processor is operative to read programs and data stored in the memory to control the second base station to perform the method of any of claims 13-20.
A user terminal UE includes a processor, a memory, and a bus interface, and the processor, the transceiver, and the memory are connected by the bus interface.

Wherein the memory is used to store programs and data stored by the processor when performing operations, and

The processor is operative to read programs and data stored in the memory to control the user terminal to perform the method of any of claims 21-32.
A first base station, the first base station is an original base station and includes:

The sending module is configured to send, to the at least one target base station, an automatic handover preparation request that carries at least the context information of the user terminal UE that accesses the first base station and the target cell indication information, where the target cell indication information is used to indicate The at least one target base station performs automatic handover admission control on the UE according to the target cell indication information, where context information of the UE is used to indicate that the at least one target base station saves the UE in at least one second target cell. Contextual information;

a receiving module, configured to receive an automatic handover preparation response message sent by the at least one target base station;

a determining module, configured to determine whether the automatic handover preparation response message sent by the at least one target base station includes first target cell information that successfully accepts the UE for automatic handover,

If the automatic handover preparation response message sent by the at least one target base station includes the first target cell information that successfully accepts the automatic handover of the UE, the sending module sends automatic handover configuration information to the UE, where the automatic handover is performed. The configuration information includes at least a cell identifier of the first target cell.
A second base station, the second base station is a target base station and includes:

The receiving module is configured to receive an automatic handover preparation request that is sent by the original base station that is accessed by the user equipment UE and that carries at least the context information of the UE and the target cell indication information;

a configuration module, configured to perform automatic handover admission control on the UE according to the target cell indication information;

a saving module, configured to save context information of the UE in at least one second target cell according to context information of the UE;

The sending module is configured to send an automatic handover preparation response message to the original base station, where the automatic handover preparation response message includes successfully receiving the UE for automatic handover if the target base station successfully accepts the UE for automatic handover. The first target cell information.
A user terminal UE includes:

a receiving module, configured to receive automatic switching configuration information sent by the original base station accessed by the user terminal UE;

a determining module, configured to determine whether the automatic handover configuration information includes a cell identifier of a first target cell that successfully accepts the UE for automatic handover;

And a selection module, configured to: when the automatic handover configuration information includes a cell identifier of the first target cell that successfully accepts the UE to perform automatic handover, select an automatic handover target cell according to the automatic handover configuration information.