WO2019095088A1 - 一种切换的方法以及设备 - Google Patents

一种切换的方法以及设备 Download PDF

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Publication number
WO2019095088A1
WO2019095088A1 PCT/CN2017/110768 CN2017110768W WO2019095088A1 WO 2019095088 A1 WO2019095088 A1 WO 2019095088A1 CN 2017110768 W CN2017110768 W CN 2017110768W WO 2019095088 A1 WO2019095088 A1 WO 2019095088A1
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WO
WIPO (PCT)
Prior art keywords
base station
primary base
user equipment
target primary
source
Prior art date
Application number
PCT/CN2017/110768
Other languages
English (en)
French (fr)
Inventor
李冠臣
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201780096141.XA priority Critical patent/CN111247835A/zh
Priority to EP17932268.0A priority patent/EP3697131A4/en
Priority to PCT/CN2017/110768 priority patent/WO2019095088A1/zh
Publication of WO2019095088A1 publication Critical patent/WO2019095088A1/zh
Priority to US15/931,002 priority patent/US11576091B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • the present application relates to the field of communications, and in particular, to a method and device for handover.
  • the 3rd generation partnership project (3GPP) protocol introduces dual connectivity (DC), which allows user equipment (UE) to simultaneously use two base stations for data transmission, including a primary base station. And a secondary base station.
  • DC dual connectivity
  • UE user equipment
  • the process of switching the primary base station is defined in 3GPP.
  • the primary primary base station to the target primary base station may occur.
  • the source primary base station first sends a handover request to the target primary base station, and then the target primary base station sends an add request to the secondary base station, requesting to add the secondary base station, and the target primary base station waits to receive the addition sent by the secondary base station.
  • the target primary base station After the request is replied, the target primary base station sends a handover request reply to the source primary base station, and then the source primary base station sends a release request to the secondary base station, where the release request is used to instruct the secondary base station to release the connection between the source primary base station and the secondary base station regarding the UE, and then Sending a radio resource control (RRC) connection reconfiguration message to the UE, and acquiring, by the UE, the handover information from the source primary base station to the target primary base station and the configuration information of the secondary base station according to the RRC connection reconfiguration message, and from the source master
  • RRC radio resource control
  • the target primary base station needs to wait for the primary base station to add the secondary base station, and the UE can perform the primary base station handover, and the waiting time is too long. long. If the UE is in a state of high-speed mobility, if the waiting time is too long and the UE may not be in the coverage of the target primary base station, the UE cannot switch to the target primary base station, causing the handover to fail.
  • the embodiment of the present application provides a handover method, a base station, a user equipment, and a computer storage medium, which can reduce the process of the UE switching the primary base station, shorten the duration of the UE switching the primary base station, and improve the handover of the primary base station by the UE in a fast moving scenario. Success rate.
  • the first aspect of the embodiments of the present application provides a method for switching, which may include:
  • the target primary base station receives a handover request sent by the source primary base station, where the handover request is used to request the user equipment to switch from the source primary base station to the target primary base station, and the target primary base station determines that the user equipment can be switched to the target primary base station without adding the user equipment.
  • the secondary base station generates a handover request acknowledgement message according to the handover request, and sends the handover request acknowledgement message to the source primary base station to notify the source primary base station to allow the user equipment to switch from the source primary base station to the target primary base station, and then the target primary base station and the user
  • the device establishes a communication connection and adds a secondary base station to the user equipment after the communication connection is established.
  • the target primary base station after receiving the handover request sent by the source primary base station, acquires the source primary base station to request the user equipment to be handed over from the source primary base station to the target primary base station, and the target primary base station is the user equipment.
  • Adding a secondary base station directly generating a handover request acknowledgement message, and transmitting the handover request acknowledgement message to the source primary base station, to notify the source primary base station to allow the user equipment to be exchanged to the target primary base station, and after establishing a communication connection with the user equipment,
  • the user equipment adds the secondary base station, which can reduce the process of the user equipment switching the primary base station, reduce the duration of the user equipment switching the primary base station, and provide the success rate of the handover of the primary base station when the user equipment moves at a high speed.
  • the target primary base station adds a secondary base station to the user equipment, which may include:
  • the target primary base station sends an add request to the secondary base station, and then receives the added acknowledgement information sent by the secondary base station, and the target primary base station obtains the secondary base station by using the added acknowledgement information to allow the target primary base station to add the secondary base station, and the target primary base station sends the secondary base station to the user equipment.
  • the configuration information of the secondary base station is such that the user equipment accesses the secondary base station according to the configuration information.
  • the target primary base station after the user equipment establishes a communication connection, adds a secondary base station to the user equipment, and may first send an add request to the secondary base station, and after receiving the added acknowledgement information sent by the secondary base station, the target primary base station is The user equipment adds the secondary base station, and the user equipment re-accesses the secondary base station, and provides a specific manner in which the target primary base station adds the secondary base station to the user equipment.
  • the target primary base station sends the configuration information of the secondary base station to the user equipment, which may include:
  • the target primary base station sends an RRC connection reconfiguration message to the user equipment, where the RRC connection reconfiguration message includes configuration information of the secondary base station, and the user equipment can access the secondary base station according to the configuration information.
  • the target primary base station sends the configuration information of the secondary base station to the source primary base station by using the RRC connection reconfiguration message, so that the user equipment can access the secondary base station according to the configuration information.
  • a second aspect of the embodiments of the present application provides a method for switching, which may include:
  • the source primary base station After confirming that the user equipment needs to be handed over to the target primary base station, the source primary base station sends a handover request to the target primary base station, requesting to switch the user equipment from the source primary base station to the target primary base station, before the target primary base station adds the secondary base station to the user equipment, the source The primary base station receives the handover request acknowledgement message sent by the target primary base station, and the source primary base station obtains the target primary shelf by using the handover request acknowledgement message to allow the user equipment to switch to the target primary base station, and then the source primary base station notifies the user equipment to switch to the location.
  • the target primary base station is configured to establish a communication connection between the user equipment and the target primary base station.
  • the source primary base station after the source primary base station confirms that the user equipment needs to be handed over to the target primary base station, it sends a handover request to the target primary base station, requesting to switch the user equipment to the target primary base station, before the target primary base station adds the secondary base station to the user equipment.
  • the source primary base station receives the handover request acknowledgement message sent by the target primary base station, and obtains the target primary base station to allow the user equipment to switch to the target primary base station by using the handover request acknowledgement message, and the target primary base station sends the handover before adding the secondary base station to the user equipment.
  • the request confirmation message does not need to add the secondary base station to the user equipment before the handover request acknowledgement message is sent, which reduces the handover procedure of the user equipment, shortens the duration of the user equipment switching the primary base station, and improves the success rate of the user equipment switching the primary base station.
  • the source primary base station notifying the user equipment to switch to the target primary base station may include:
  • the source primary base station sends an RRC connection reconfiguration message to the user equipment, where the RRC connection reconfiguration message includes handover information of the user equipment switching from the source primary base station to the target primary base station, so that the user equipment obtains the handover information according to the handover information.
  • the source primary base station switches to the target primary base station.
  • One of the ways in which the source primary base station notifies the user equipment to switch to the target primary base station.
  • the source primary base station notifies the user equipment to switch to After the target primary base station, the source primary base station sends a release request to the secondary base station, where the release request is used to indicate that the release source primary base station and the secondary base station are used by The connection of the device.
  • a third aspect of the embodiments of the present application provides a method for switching, which may include:
  • the user equipment receives the notification information sent by the source primary base station, where the notification information includes handover information of the user equipment switching from the source primary base station to the target primary base station, where the notification information is that the source primary base station receives the handover sent by the target primary base station.
  • the handover request acknowledgement message is sent before the target primary base station adds the secondary base station to the user equipment, and the handover request acknowledgement message is used to indicate that the user equipment is allowed to switch from the source primary base station to the target primary station.
  • the base station, the user equipment establishes a communication connection with the target primary base station according to the notification information.
  • the target primary base station sends a handover request acknowledgement message to the source primary base station before adding the secondary base station to the user equipment, which reduces the process of adding the secondary base station when the user equipment switches the primary base station, and can shorten the user equipment switching master.
  • the duration of the base station can improve the success rate of the user equipment switching the primary base station.
  • the user equipment after the user equipment establishes a connection with the target primary base station according to the notification information, the user equipment receives the target primary base station and sends the The first RRC connection reconfiguration message includes the configuration information of the secondary base station, and the user equipment accesses the secondary base station according to the configuration information.
  • the user equipment after the user equipment establishes a communication connection with the target primary base station, the user equipment accesses the secondary base station, and the user equipment does not need to add the secondary base station when switching the primary base station, thereby reducing the process for the user equipment to add the secondary base station when switching the primary base station.
  • the process of switching the primary base station by the user equipment can be shortened, and the success rate of the user equipment switching the primary base station is improved.
  • the user equipment establishes a connection with the target primary base station according to the notification information, and may include:
  • the user equipment receives the second RRC connection reconfiguration message sent by the source primary base station, where the second RRC connection reconfiguration message includes handover information that is switched to the target primary base station, and the user equipment accesses the target primary base station according to the handover information, and the target owner
  • the base station establishes a communication connection.
  • a fourth aspect of the embodiments of the present application provides a base station, which has a function of implementing a target primary base station in a method corresponding to the handover provided by any of the foregoing first aspect or the first aspect.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • a fifth aspect of the embodiments of the present application provides a base station, which has a function of implementing a source primary base station in a method corresponding to the handover provided by any of the foregoing second aspect or the second aspect.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • a sixth aspect of the embodiments of the present application provides a user equipment, which has a function of implementing a user in a method corresponding to the handover provided by any of the foregoing third aspect or the third aspect.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • a seventh aspect of the embodiments of the present application provides a base station, which may include:
  • processor a processor, a memory, a bus, and an input/output interface, the processor, the memory and the input/output interface being connected through the bus;
  • the memory for storing program code
  • the processor performs the steps performed by the target primary base station provided by the first aspect or the first aspect of the first aspect when the processor calls the program code in the memory.
  • a seventh aspect of the embodiments of the present application provides a base station, which may include:
  • processor a processor, a memory, a bus, and an input/output interface, the processor, the memory and the input/output interface being connected through the bus;
  • the memory for storing program code
  • the processor performs the steps performed by the source primary base station provided by the second aspect of the present application or the second aspect of the second aspect when the processor calls the program code in the memory.
  • the eighth aspect of the embodiments of the present application provides a user equipment, which may include:
  • processor a processor, a memory, a bus, and an input/output interface, the processor, the memory and the input/output interface being connected through the bus;
  • the memory for storing program code
  • a ninth aspect of the present application provides a communication system, including a target primary base station and a source primary base station, where the target primary base station is a target primary base station in any one of the first to third embodiments of the present application.
  • the source primary base station is the source primary base station in any one of the first to third embodiments of the present application;
  • the user equipment is the user equipment in any one of the first to third aspects of the present application. .
  • a tenth aspect of the present application provides a storage medium. It should be noted that the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be implemented by software.
  • the computer software product is stored in a storage medium for storing computer software instructions for use in the above apparatus, comprising: a target primary base station, a source for performing any of the above first to third aspects A program designed by the primary base station or user equipment.
  • the storage medium includes: a U disk, a mobile hard disk, a read only memory (English abbreviation ROM, English full name: Read-Only Memory), a random access memory (English abbreviation: RAM, English full name: Random Access Memory), a disk or a disk. And other media that can store program code.
  • An eleventh aspect of the present application provides a computer program product comprising instructions, which when executed on a computer, cause the computer to perform the method as described in the first aspect of the present application or any of the optional embodiments of the first aspect .
  • a twelfth aspect of the embodiments of the present application provides a computer program product comprising instructions, when executed on a computer, causing the computer to perform the method as described in the second aspect or any alternative implementation of the second aspect of the present application .
  • a thirteenth aspect of the embodiments of the present application provides a computer program product comprising instructions, when executed on a computer, causing the computer to perform the method as described in the third aspect or any alternative implementation of the third aspect of the present application .
  • a fourteenth aspect of the present application provides a communication apparatus including a processing element and a storage element, wherein the storage element is configured to store a program, when the program is called by the processing element, to perform the first aspect or the first The method of any of the embodiments.
  • a fifteenth aspect of the present application provides a communication apparatus including a processing element and a storage element, wherein the storage element is configured to store a program, when the program is called by the processing element, to perform the second aspect or the second The method of any of the embodiments.
  • a sixteenth aspect of the present application provides a communication device, including a processing element and a storage element, wherein the storage element For storing a program, when the program is called by the processing element, for performing the method described in any one of the third aspect or the third aspect.
  • the target primary base station when the target primary base station receives the handover request sent by the source primary base station, and learns that the UE needs to switch from the source primary base station to the target primary base station, directly responds to the handover request, and allows the UE to obtain the source primary base station. Switching to the target primary base station and then establishing a connection directly with the UE reduces the delay of the target primary base station adding the secondary base station.
  • FIG. 1 is a schematic diagram of a network architecture in an embodiment of the present application
  • FIG. 2 is a schematic diagram of data transmission and a protocol stack in an embodiment of the present application
  • FIG. 3 is a schematic diagram of an application scenario in an embodiment of the present application.
  • FIG. 4 is a schematic diagram of an embodiment of a method for handover in an embodiment of the present application.
  • FIG. 5 is a schematic diagram of another embodiment of a method for handover in an embodiment of the present application.
  • FIG. 6 is a schematic diagram of an embodiment of a base station according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of another embodiment of a base station according to an embodiment of the present application.
  • FIG. 8 is a schematic diagram of an embodiment of a user equipment according to an embodiment of the present application.
  • FIG. 9 is a schematic diagram of another embodiment of a base station according to an embodiment of the present application.
  • FIG. 10 is a schematic diagram of another embodiment of a user equipment according to an embodiment of the present application.
  • FIG. 11 is a schematic diagram of an embodiment of a communication device according to an embodiment of the present application.
  • FIG. 1 is a schematic diagram of a network architecture in an embodiment of the present application.
  • the UE may simultaneously connect at least two base stations.
  • the access network may include an evolved universal terrestrial radio access network (EUTRAN) and an LTE-NR (new radio) in a long term evolution (LTE) system.
  • EUTRAN evolved universal terrestrial radio access network
  • LTE-NR new radio
  • a non-standalone (NSA) network or an access network of a system in which a UE can simultaneously connect at least two base stations and use the at least two base stations for data transmission.
  • the mobility management entity (MME) and the serving gateway (S-GW) are network elements in the core network, and the MME and the S-GW respectively establish a connection with the primary base station in the access network.
  • the primary base station is used as the mobility anchor for the core network.
  • a connection is established between the primary base station and the secondary base station, and the secondary base station can perform data transmission with the UE.
  • a wireless Uu interface is established between the UE and the primary base station and the secondary base station, and the interface can be used to transmit data sent and received by the UE, that is, the UE can perform data transmission by using the primary base station and the secondary base station, and the data throughput of the network is improved.
  • the communication efficiency of the UE is improved.
  • the embodiment of the present application provides a method, a base station, and a UE for rapidly switching a primary base station, so that the UE can quickly switch from a source primary base station to a target primary base station. When the UE moves at a high speed and traverses the coverage between the primary base stations, the primary base station can be quickly switched, and the success rate of the UE switching the primary base station is improved.
  • LTE Long Term Evolution
  • a system of multiple access, time division multiple access, orthogonal frequency division multiple access, single carrier frequency division multiple access and other access technologies can also be applied to the subsequent evolution system using the LTE system, such as the fifth generation 5G system and the like. The details are not limited herein.
  • the protocol stack of the primary cell bearer (MCG bearer) is located only in the primary base station, that is, the bearer only uses the primary base station for data transmission;
  • the protocol bearer of the split bearer is located in the primary base station and the secondary base station, that is, the bearer can be
  • the primary base station and the secondary base station are used for data transmission at the same time;
  • the protocol stack of the SCG bearer is located only in the secondary base station, that is, the bearer uses only the secondary base station for data transmission.
  • the split bearer configures a packet data convergence protocol (PDCP) entity in the primary base station, and two radio link control (RLC) entities respectively located at the primary base station and the secondary base station, and respectively
  • the media access control (MAC) entity and the physical layer (PHY) of the primary and secondary base stations the following data is taken as an example.
  • the PDCP in the primary base station will be part of the PDCP protocol data unit (protocol data unit).
  • PDU is sent to the RLC entity in the secondary base station through the X2 or Xn interface (X2 in the EUTRAN of the LTE, Xn in the NSA of the LTE-NR), and then the next RLC entity in the secondary base station performs the next transmission, and the other part sends
  • the RLC entity in the primary base station is then sent by the RLC entity in the primary base station for the next transmission.
  • the MCG bearer directly sends the PDU directly to the RLC entity by the PDCP in the primary base station, and then the next RLC entity in the primary base station performs the next transmission.
  • the SCG bearer directly sends the PDU directly to the RLC entity by the PDCP in the secondary base station, and then the next step is sent by the RLC entity in the secondary base station.
  • the primary base station may be a master evolved Node B (MeNB), and the secondary base station may be a secondary evolved Node B (SeNB).
  • the primary base station may It is a MgNB (master gNode B, primary base station), and the secondary base station may be a secondary gNode B (secondary gNode B).
  • FIG. 3 is a schematic diagram of an application scenario in the embodiment of the present application.
  • the UE establishes a communication connection with the source primary base station and the secondary base station, and uses the source primary base station and the secondary base station to perform data transmission.
  • the UE moves from the coverage of the source primary base station to the coverage of the target primary base station, the UE receives the The signal strength of the target signal of the target primary base station is getting stronger and stronger, and the signal strength of the source signal received by the UE from the source primary base station is weaker.
  • the source primary base station When the signal strength of the target signal is greater than the threshold or the signal strength of the source signal is lower than the threshold, Or the source primary base station is to be shut down, and the primary base station may be initiated by the UE itself, or may be initiated by the source primary base station after detecting the mobile of the UE, which is not limited herein.
  • the source primary base station and the target primary base station in the embodiment of the present application may be the MeNB in the EUTRAN of the LTE, the MgNB in the LTE-NR, or the primary base station in other systems including the DC scenario.
  • the secondary base station may be the SeNB in the EUTRAN of the LTE, or may be the SgNB in the LTE-NR, or may be the secondary base station in the system including the DC scenario, which is not limited herein.
  • a schematic diagram of an embodiment of a method for handover in an embodiment of the present application includes:
  • the source primary base station sends a handover request to the target primary base station.
  • the UE is currently attached to the source primary base station.
  • the source primary base station detects that the UE moves from the coverage of the source primary base station to the coverage of the target primary base station
  • the source primary base station detects that the signal strength of the target primary base station is greater than a threshold or greater than the source master.
  • the source primary base station sends a handover request to the target primary base station, and sends a handover request to the target primary base station, and the target master Base station
  • the source primary base station requests to acquire the UE to the target primary base station through the handover request.
  • the target primary base station sends a handover request acknowledgement message to the source primary base station.
  • the target primary base station After the target primary base station receives the handover request of the source primary base station, and confirms that the UE can switch to the target primary base station, the target primary base station sends a handover request acknowledgement message to the source primary base station, where the handover request acknowledgement message is used to notify the source primary base station to allow the UE to switch. Go to the target primary base station.
  • the target primary base station After receiving the handover request from the source primary base station, the target primary base station does not need to directly add the secondary base station of the UE, and directly sends a handover request acknowledgement message to the source primary base station, which reduces the flow of the target primary base station adding the secondary base station to the UE, and can shorten the target host. The length of time that the base station establishes a communication connection with the UE.
  • the source primary base station sends notification information to the UE.
  • the source primary base station After the source primary base station confirms that the target primary base station allows the UE to handover to the target primary base station, the source primary base station notifies that the UE can switch to the target primary base station, and the UE receives the notification information sent by the source primary base station, and obtains the handover from the source primary base station by using the notification information. Switching information to the target primary base station.
  • the UE establishes a communication connection with the target primary base station.
  • the UE Before the target primary base station adds the secondary base station to the UE, the UE accesses the target primary base station according to the handover information in the notification information, establishes a communication connection with the target primary base station, and can use the target primary base station to perform data transmission.
  • the target primary base station after receiving the handover request sent by the source primary base station, the target primary base station confirms that the UE can switch to the target primary base station, and does not need to add the secondary base station to the UE, and directly sends a handover request acknowledgement message to the source primary base station.
  • the source primary base station To notify the source primary base station to allow the UE to handover to the target primary base station, the source primary base station notifies the UE to handover to the target primary base station, and then the UE establishes a communication connection with the target primary base station.
  • the process of adding the secondary base station to the target primary base station is reduced, and the duration of the UE switching the primary base station is shortened, and the success rate of the UE switching the primary base station is improved.
  • the target primary base station adds a secondary base station to the UE.
  • the target primary base station After the UE successfully switches from the source primary base station to the target primary base station, the target primary base station adds a secondary base station to the UE, the UE accesses the secondary base station, and the target primary base station establishes a communication connection with the secondary base station about the UE, and the UE can use the primary base station and the secondary base station. Data transmission is performed, the data throughput of the network is improved, and the data transmission efficiency of the UE is improved.
  • the target primary base station after receiving the handover request sent by the source primary base station, learns that the source primary base station requests to handover the UE to the target primary base station, and confirms that the UE can switch to the target primary base station, before adding the secondary base station to the UE. And transmitting, by the source primary base station, handover reply information, to notify the source primary base station to allow the UE to handover to the target primary base station, and then establish a communication connection with the UE.
  • the process of the UE switching from the source primary base station to the target primary base station is reduced, the duration of the UE switching from the source primary base station to the target primary base station is shortened, and the success rate of the UE switching the primary base station under fast mobility is improved.
  • the secondary base station is added to the UE, so that the UE can use the primary base station and the secondary base station to perform data transmission, improve data transmission efficiency, and improve the UE to switch in a fast moving scenario.
  • the success rate of the primary base station is added to the UE, so that the UE can use the primary base station and the secondary base station to perform data transmission, improve data transmission efficiency, and improve the UE to switch in a fast moving scenario.
  • Xiao Ming holds a mobile phone and drives from the B cell to the A cell when he returns home from work.
  • the mobile speed is 100 km/h.
  • the connected primary base station is The primary base station C and the secondary base station D are located between the B-cell and the A-cell, and the coverage of the primary base station C is the B-cell.
  • Xiao Ming moves from the B cell to the A cell quickly, the signal strength of the signal received by the mobile phone to the primary base station C becomes weaker and weaker, and the signal strength of the signal received by the primary base station E becomes stronger and stronger, and the coverage of the primary base station E It is the A community.
  • the primary base station C detects a change in the signal strength of the mobile phone, initiates a handover request to the primary base station C, requests to handover the mobile phone from the primary base station C to the primary base station E, and the primary base station E receives the handover request sent by the primary base station C.
  • the mobile phone confirm that the mobile phone can be cut Switching to the primary base station E, without adding a secondary base station, directly transmitting a handover request acknowledgement message to the primary base station C, notifying the primary base station C that the mobile telephone is allowed to handover to the primary base station E, the primary base station C notifying the mobile telephone to perform handover, and switching to the primary base station
  • the switching information of E is sent to the mobile phone, and the mobile phone establishes a communication connection with the primary base station E according to the switching information, and the mobile phone and the primary base station E can perform fast switching without waiting for the primary base station E to add the secondary base station D and then the mobile phone.
  • the mobile phone if the mobile phone is in a state of high speed movement, it can quickly switch from the primary base station C to the primary base station E when the primary base station is in the coverage of the primary base station E.
  • the primary base station E After the primary base station E successfully establishes a communication connection with the mobile phone, the primary base station E acquires the secondary base station D of the mobile phone as the secondary base station D, and then the primary base station E adds the secondary base station D to the mobile phone, so that the mobile phone can use the primary base station E and the secondary base station.
  • D performs data transmission to provide communication efficiency of the mobile phone.
  • the source primary base station and the target primary base station in the embodiment of the present application may be in the EUTRAN of the LTE.
  • the MeNB may be a MME in the LTE-NR, or may be a primary eNB in a system including a DC scenario except LTE.
  • the specific eNB is not limited.
  • the secondary eNB may be the SeNB in the EUTRAN of the LTE, or may be
  • the SgNB in the LTE-NR may also be a secondary base station in a system including a DC scenario except LTE, which is not limited herein.
  • FIG. 5 a schematic diagram of another embodiment of a method for handover in an embodiment of the present application includes:
  • the source primary base station sends a handover request to the target primary base station.
  • the UE attached to the source primary base station is switched, and the source primary base station receives the UE to switch to the target.
  • the source primary base station After the request of the primary base station detects the coverage of the UE moving to the target primary base station or the source primary base station determines that the UE needs to handover to the target primary base station or the like through different paths, the source primary base station sends a handover request to the target primary base station, requesting that the UE be sourced from the source The primary base station switches to the target primary base station.
  • mobile phone B used by user A is also in the car at this time, following the car movement, if the mobile phone B is connected to the primary base station at this time as the base station C, and as the car travels, the mobile phone B also follows the movement, moving from the coverage of the base station C to the coverage of the base station D. Then, the mobile phone B or the base station C can initiate a request for the mobile telephone B to switch the primary base station from the base station C to the base station D to the base station D.
  • the primary base station to which the mobile phone B is connected is the base station C
  • the coverage rate of the base station C is high due to the high coverage repetition rate of the base station C and the base station D. Low, so the base station C needs to be temporarily turned off. Then, the mobile phone B needs to switch the primary base station from the base station C to the base station D, and the base station C initiates a request to the base station D.
  • the target primary base station sends a handover request acknowledgement message to the source primary base station.
  • the target primary base station After receiving the handover request sent by the source primary base station, the target primary base station learns that the source primary base station requests to switch the UE to the target primary base station or the UE requests to switch from the source primary base station to the target primary base station, and does not need to add the secondary base station to the UE.
  • the acknowledgment information includes the target primary base station allowing the UE to switch from the source primary base station to itself, and transmitting a handover request acknowledgement message including the acknowledgment information to the source primary base station, informing the source primary base station to allow the UE to switch from the source primary base station to the target Primary base station.
  • the target primary base station after receiving the handover request sent by the source primary base station, the target primary base station sends a handover request acknowledgement message to the source primary base station before the target primary base station adds the secondary base station to the UE, which reduces the UE switching the primary base station.
  • the process of adding the secondary base station can shorten the duration of the UE switching the primary base station.
  • the source primary base station sends a first RRC connection reconfiguration message to the UE.
  • the source primary base station After receiving the handover request acknowledgement message sent by the target primary base station, the source primary base station determines that the UE can be handed over from the source primary base station to the target primary base station, and sends a first RRC connection reconfiguration message to the UE to notify the UE to switch to the target primary base station.
  • the first RRC connection reconfiguration message includes handover configuration information that the UE switches from the source primary base station to the target primary base station.
  • the UE randomly accesses the target primary base station.
  • the UE receives the first RRC connection reconfiguration message sent by the source primary base station, acquires handover configuration information that is switched from the source primary base station to the target primary base station, and randomly accesses the target primary base station according to the handover configuration information.
  • the UE sends an RRC connection reconfiguration complete message to the target primary base station.
  • the RRC connection reconfiguration complete message may be sent to the target primary base station to notify the target primary base station that the RRC connection reconfiguration is complete.
  • the target primary base station sends a secondary base station add request to the secondary base station.
  • the target primary base station receives the RRC connection reconfiguration complete message sent by the UE, determines that the UE has accessed the target primary base station, acquires the secondary base station of the UE, and sends a secondary base station addition request to the secondary base station to request the secondary base station to add the primary base station. Secondary base station.
  • the target primary base station establishes a communication connection with the UE, that is, after the UE successfully switches from the source host to the target primary base station, the secondary base station is added to the UE, and the secondary base station is not added when the UE establishes a communication connection with the target primary base station.
  • the base station reduces the process of adding the secondary base station to the UE, and can shorten the duration of the handover of the primary base station by the UE. When the UE is in high-speed movement, it can provide the success rate of the UE switching the primary base station.
  • the secondary base station sends a secondary base station add request acknowledgement message to the target primary base station.
  • the secondary base station receives the secondary base station addition request sent by the target primary base station, and after the target primary base station requests to add the secondary base station to the UE, the secondary base station sends a secondary base station addition request acknowledgement message to the target primary base station, and allows the target primary base station to add the secondary base station to the UE. Base station.
  • the target primary base station sends a second RRC connection reconfiguration message to the UE.
  • the target primary base station After confirming that the secondary base station can be added to the UE, the target primary base station sends a second RRC connection reconfiguration message to the UE, where the second RRC connection reconfiguration message includes configuration information of the secondary base station.
  • the UE randomly accesses the secondary base station.
  • the UE After receiving the second RRC connection reconfiguration message sent by the target primary base station, the UE obtains the configuration information of the secondary base station according to the second RRC connection reconfiguration message, and accesses the secondary base station according to the configuration information, it should be understood that the UE is switching the primary In the case of the base station, the link with the secondary base station may be disconnected or not disconnected. If the connection with the secondary base station is not disconnected, the secondary base station may be re-accessed according to the configuration information.
  • the UE sends an RRC connection reconfiguration complete message to the target primary base station.
  • the UE After successfully accessing the secondary base station, the UE sends an RRC connection reconfiguration complete message to the target primary base station to notify the target primary base station that the UE has accessed the secondary base station.
  • the target primary base station sends a secondary base station reconfiguration complete message to the secondary base station.
  • the target primary base station After the target primary base station confirms that the UE has accessed the secondary base station, it may also send a secondary base station reconfiguration complete message to the secondary base station, and it has been determined that the target primary base station has successfully added the secondary base station to the UE.
  • the source primary base station sends a sequence number of the transmission data to the target primary base station.
  • the source primary base station may send the PDCP sequence number of the already transmitted data to the target primary base station.
  • the target primary base station In order to make the target primary base station know the serial number of the data that has been transmitted, data loss is prevented. For example, when the UE performs the primary base station handover, the source primary base station performs data transmission of the split bearer or the MCG bearer, and the UE switches to the target primary base station.
  • the source primary base station After the data transmitted by the source primary base station is transmitted by one third, the source primary base station transmits the PDCP sequence number of the transmitted one-third data and the transmission status to the target primary base station, so that the target primary base station learns the The transmission status of one-third of the data.
  • the S-GW performs data pre-transmission with the source primary base station.
  • the S-GW When the S-GW learns that the UE performs the primary base station handover when performing data transmission, the S-GW sends the data that the source primary base station has transmitted to the source primary base station, and then the source primary base station sends the data to the target primary base station.
  • the source primary base station and the target primary base station perform data pre-transmission
  • the source primary base station After the S-GW sends the data that the source primary base station has transmitted to the source primary base station, the source primary base station sends the data to the target primary base station. For example, the source primary base station will have transmitted one-third of the data, then the S-GW The one-third data is sent to the source primary base station, and then the source primary base station sends the one-third data to the target primary base station to maintain the integrity of the transmitted data to prevent data loss when the UE switches the primary base station.
  • the source primary base station sends a release request to the secondary base station.
  • the source primary base station sends a release request to the secondary base station, where the release request is used to notify the secondary base station to delete the connection with the source primary base station about the UE, and to reserve the UE context, and the secondary base station can continue to use the UE context.
  • step 515 in the embodiment of the present application may be performed before or after any step after step 505, which is not limited herein.
  • the target primary base station sends a path switch request to the MME.
  • the target primary base station sends a path switch request to the MME to request the MME to change the primary base station path of the UE.
  • the MME and the S-GW perform bearer modification.
  • the MME and the S-GW modify the Split bearer or the MCG bearer of the target primary base station, including re-establishing a Split bearer or an MCG bearer at the target primary base station.
  • the S-GW sends a new path message to the target primary base station.
  • the S-GW and the MME determine the Split bearer or the MCG bearer of the target primary base station
  • the S-GW and the MME notify the target primary base station of the Split bearer or the MCG bearer.
  • the MME sends a path switch request acknowledgement message to the target primary base station.
  • the MME sends a Path Switch Request Acknowledgement message to the target primary base station to confirm the new path of the handover.
  • the target primary base station sends a UE context release message to the source primary base station.
  • the target primary base station After confirming that the new path is established, that is, after the split bearer or the MCG bearer is established, the target primary base station sends a UE context release message to the source primary base station, so that the source primary base station releases the UE context.
  • the source primary base station sends a UE context release message to the secondary base station.
  • the source primary base station After releasing the UE context, the source primary base station notifies the secondary base station that the source primary base station has released the UE context, and the secondary base station may continue to use the UE context for uncompleted data transmission, and the data transmission performed during the UE handover may continue to be transmitted.
  • steps 512-521 are optional steps.
  • the handover request is to request to handover the UE from the source primary base station to the target primary base station, and the target primary base station sends a handover request acknowledgement message to the source primary base station.
  • the target primary base station adds the secondary base station to the UE, and sends the configuration information of the secondary base station to the UE, so that the UE accesses the secondary base station.
  • the target primary base station After receiving the handover request of the source primary base station, the target primary base station directly replies to the handover request, and waits for the UE to switch from the source primary base station to the target primary base station, and then the target primary base station adds the secondary base station to the UE, and the UE The communication connection with the UE is not established after waiting for the target primary base station to add the secondary base station, which reduces the process of the UE switching the primary base station, and reduces the duration of the UE switching the primary base station.
  • the mobile phone B of the user A is in a mobile state, and moves from the coverage of the primary base station C to the coverage of the primary base station D.
  • the primary base station C transmits a handover request to the primary base station D, requesting that the primary base station C of the UE be handed over to the primary base station D.
  • the primary base station D After receiving the handover request sent by the primary base station C, the primary base station D knows that the primary base station C requests to switch the UE to the primary base station D.
  • the primary base station D does not need to add the secondary base station E to the mobile phone B, and the auxiliary base station D is added to the mobile phone B.
  • the flow of the base station directly sends a handover request acknowledgement message to the primary base station C to notify the primary base station C to allow the UE to handover to the primary base station D.
  • the handover information of the primary base station C to the primary base station D is transmitted to the UE by the RRC connection reconfiguration message, and the UE can access the primary base station D according to the handover information to establish a communication connection with the primary base station D.
  • the process of switching the mobile phone B from the primary base station C to the primary base station D is reduced, the handover duration is reduced, and the success rate of the mobile phone B switching from the primary base station C to the primary base station D is improved.
  • the primary base station D acquires the secondary base station E corresponding to the mobile phone B, and sends an add request to the secondary base station E to request to add the secondary base station E to the mobile phone B, upon receiving the secondary After the add request acknowledgement message of the base station E establishes a communication connection with the secondary base station E for the mobile phone B, and then sends an RRC connection reconfiguration message to the mobile phone B, where the RRC connection reconfiguration message includes configuration information of the secondary base station E, and moves The phone A can access the secondary base station E according to the configuration information.
  • the amount of data transmission of the mobile phone B is increased.
  • the primary base station C can send a secondary base station release request to the secondary base station E, and the secondary base station E can release the connection with the primary base station C about the mobile telephone B according to the secondary base station release request, while retaining the mobile terminal.
  • the context of phone B prevents loss of data transmitted during handover.
  • the primary base station D adds the secondary base station E to the mobile phone B after successfully establishing a communication connection with the mobile phone B, which can reduce the flow of the mobile phone B to switch the primary base station, and can shorten the mobile phone B.
  • FIG. 6 a schematic diagram of an embodiment of a base station in this embodiment of the present application includes:
  • the receiving unit 601 is configured to receive a handover request sent by the source primary base station, where the handover request is used to request the user equipment to switch from the source primary base station to the target primary base station;
  • the sending unit 602 is configured to send, according to the handover request, a handover request acknowledgement message to the source primary base station, where the handover request acknowledgement message is used to indicate that the user equipment is allowed to switch from the source primary base station to the target primary base station;
  • the processing unit 603 is configured to establish a communication connection with the user equipment.
  • the processing unit 603 is further configured to add a secondary base station to the user equipment.
  • the sending unit 602 is further configured to send an add request to the secondary base station
  • the receiving unit 601 is further configured to receive the adding acknowledgement information sent by the secondary base station, where the added acknowledgement information is used to indicate that the target primary base station is allowed to add the secondary base station;
  • the sending unit 602 is further configured to send configuration information of the secondary base station to the user equipment, so that the user equipment accesses the secondary base station according to the configuration information.
  • the sending unit 602 is configured to send, to the user equipment, a radio resource control RRC connection reconfiguration message, where the RRC connection reconfiguration message includes configuration information of the secondary base station, where the first connection reconfiguration message is used to indicate that the user equipment is configured according to the The configuration information is accessed by the secondary base station.
  • a schematic diagram of another embodiment of a base station in this embodiment of the present application includes:
  • the sending unit 701 is configured to send, to the target primary base station, a handover request, where the handover request is used to indicate that the user equipment is requested to be handed over from the source primary base station to the target primary base station;
  • the receiving unit 702 is configured to receive a handover request acknowledgement message sent by the target primary base station, where the handover request acknowledgement message is sent before the target primary base station adds the secondary base station to the user equipment, where the handover request acknowledgement message is used to indicate that the User equipment switching from the source primary base station to the target primary base station;
  • the processing unit 703 is configured to notify the user equipment to switch to the target primary base station, so that the user equipment establishes a communication connection with the target primary base station.
  • the processing unit 703 is specifically configured to send an RRC connection reconfiguration message to the user equipment, where the RRC connection reconfiguration message includes handover information of the user equipment switching from the source primary base station to the target primary base station, so that the user equipment according to the handover Information is switched from the source primary base station to the target primary base station.
  • the sending unit 701 is further configured to send a release request to the secondary base station, where the release request is used to indicate that the connection between the source primary base station and the secondary base station about the user equipment is released.
  • a schematic diagram of an embodiment of a user equipment in the embodiment of the present application includes:
  • the receiving unit 801 is configured to receive the notification information sent by the source primary base station, where the notification information includes handover information of the user equipment switching from the source primary base station to the target primary base station, where the notification information is that the source primary base station receives the target
  • the handover request acknowledgement message is sent by the primary base station
  • the handover request acknowledgement message is sent before the target primary base station adds the secondary base station to the user equipment
  • the handover request acknowledgement message is used to indicate that the user equipment is allowed to be from the source primary base station. Switching to the target primary base station;
  • the processing unit 802 is configured to establish a communication connection with the target primary base station according to the notification information.
  • the receiving unit 801 is further configured to receive, after the processing unit 802 establishes a connection with the target primary base station according to the notification information, a first RRC connection reconfiguration message that is sent by the target base station, where the first RRC connection reconfiguration message includes the auxiliary Base station configuration information;
  • the processing unit 802 is further configured to access the secondary base station according to the configuration information in the first RRC connection reconfiguration message received by the receiving unit 801.
  • the receiving unit 801 is further configured to receive a second RRC connection reconfiguration message sent by the source primary base station, where the second RRC connection reconfiguration message includes the handover information;
  • the processing unit 802 is further configured to establish a connection with the target primary base station according to the handover information in the second RRC connection reconfiguration message received by the receiving unit 801.
  • FIG. 9 is a schematic diagram of another embodiment of a base station in the embodiment of the present application.
  • the base station 900 may generate a large difference due to different configurations or performances, and may include one or more central processing units (central processing units).
  • 922 eg, one or more processors
  • memory 932 e.g., one or more storage media 930 storing application 942 or data 944 (eg, one or one storage device in Shanghai).
  • the memory 932 and the storage medium 930 may be short-term storage or persistent storage.
  • the program stored on storage medium 930 may include one or more modules (not shown), each of which may include a series of instruction operations in the base station.
  • central processor 922 can be configured to communicate with storage medium 930, executing a series of instruction operations in storage medium 930 on detection device 900.
  • Base station 900 can also include one or more power supplies 926, one or more wired or wireless network interfaces 950, one or more input and output interfaces 958, and/or one or more operating systems 941, such as Windows ServerTM, Mac OS. XTM, UnixTM, LinuxTM, FreeBSDTM and more.
  • operating systems 941 such as Windows ServerTM, Mac OS. XTM, UnixTM, LinuxTM, FreeBSDTM and more.
  • the steps performed by the base station in the above embodiments may be based on the base station structure shown in FIG.
  • the embodiment of the present application further provides another user equipment, as shown in FIG. 10 .
  • the user equipment may be any terminal device including a mobile phone, a tablet computer, a PDA (Personal Digital Assistant), a POS (Point of Sales), an in-vehicle computer, etc., and the following is performed on the user equipment in the embodiment of the present application.
  • FIG. 10 is a block diagram showing a partial structure of a user equipment provided by an embodiment of the present application.
  • the user equipment includes: a radio frequency (RF) circuit 1010, a memory 1020, an input unit 1030, a display unit 1040, a sensor 1050, an audio circuit 1060, a wireless fidelity (WiFi) module 1070, and a processor. 1080, and power supply 1090 and other components.
  • RF radio frequency
  • the RF circuit 1010 can be used for receiving and transmitting signals during the transmission or reception of information or during a call. In particular, after receiving the downlink information of the base station, it is processed by the processor 1080. In addition, the uplink data is designed to be sent to the base station. Generally, RF circuit 1010 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, RF circuit 1010 can also communicate with the network and other devices via wireless communication. The above wireless communication may use any communication standard or protocol, including but not limited to Global System of Mobile communication (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (Code Division). Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), E-mail, Short Messaging Service (SMS), and the like.
  • GSM Global System of Mobile communication
  • GPRS General Packet Radio Service
  • the memory 1020 can be used to store software programs and modules, and the processor 1080 executes various functional applications and data processing of the user devices by running software programs and modules stored in the memory 1020.
  • Memory 1020 can be master The storage program area and the storage data area are included, wherein the storage program area can store an operating system, an application required for at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area can be stored according to the user equipment. Use the created data (such as audio data, phone book, etc.).
  • memory 1020 can include high speed random access memory, and can also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
  • the input unit 1030 can be configured to receive input numeric or character information and to generate key signal inputs related to user settings and function controls of the user device.
  • the input unit 1030 may include a touch panel 1031 and other input devices 1032.
  • the touch panel 1031 also referred to as a touch screen, can collect touch operations on or near the user (such as the user using a finger, a stylus, or the like on the touch panel 1031 or near the touch panel 1031. Operation), and drive the corresponding connecting device according to a preset program.
  • the touch panel 1031 may include two parts: a touch detection device and a touch controller.
  • the touch detection device detects the touch orientation of the user, and detects a signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts the touch information into contact coordinates, and sends the touch information.
  • the processor 1080 is provided and can receive commands from the processor 1080 and execute them.
  • the touch panel 1031 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic waves.
  • the input unit 1030 may also include other input devices 1032.
  • other input devices 1032 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control buttons, switch buttons, etc.), trackballs, mice, joysticks, and the like.
  • the display unit 1040 can be used to display information input by the user or information provided to the user as well as various menus of the user device.
  • the display unit 1040 may include a display panel 1041.
  • the display panel 1041 may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.
  • the touch panel 1031 may cover the display panel 1041, and when the touch panel 1031 detects a touch operation thereon or nearby, the touch panel 1031 transmits to the processor 1080 to determine the type of the touch event, and then the processor 1080 according to the touch event.
  • the type provides a corresponding visual output on display panel 1041.
  • the touch panel 1031 and the display panel 1041 are implemented as two separate components to implement input and input functions of the user device, in some embodiments, the touch panel 1031 may be integrated with the display panel 1041. The input and output functions of the user device are implemented.
  • the user device may also include at least one type of sensor 1050, such as a light sensor, motion sensor, and other sensors.
  • the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel 1041 according to the brightness of the ambient light, and the proximity sensor may close the display panel 1041 when the user equipment moves to the ear. / or backlight.
  • the accelerometer sensor can detect the magnitude of acceleration in all directions (usually three axes). When it is stationary, it can detect the magnitude and direction of gravity.
  • Audio circuit 1060, speaker 1061, and microphone 1062 can provide an audio interface between the user and the user device.
  • the audio circuit 1060 can transmit the converted electrical data of the received audio data to the speaker 1061, and convert it into a sound signal output by the speaker 1061.
  • the microphone 1062 converts the collected sound signal into an electrical signal, which is converted by the audio signal.
  • the path 1060 is converted to audio data after reception, and then processed by the audio data output processor 1080, transmitted to the other user equipment via the RF circuit 1010, or output to the memory 1020 for further processing.
  • WiFi is a short-range wireless transmission technology
  • the user equipment can help users to send and receive emails, browse web pages, and access streaming media through the WiFi module 1070, which provides users with wireless broadband Internet access.
  • FIG. 10 shows the WiFi module 1070, it can be understood that it does not belong to the necessary configuration of the user equipment, and may be omitted as needed within the scope of not changing the essence of the application.
  • the processor 1080 is a control center for the user equipment, connecting various portions of the entire user equipment using various interfaces and lines, by running or executing software programs and/or modules stored in the memory 1020, and recalling data stored in the memory 1020.
  • the user equipment is subjected to various functions and processing data to perform overall monitoring of the user equipment.
  • the processor 1080 may include one or more processing units; preferably, the processor 1080 may integrate an application processor and a modem processor, where the application processor mainly processes an operating system, a user interface, an application, and the like.
  • the modem processor primarily handles wireless communications. It will be appreciated that the above described modem processor may also not be integrated into the processor 1080.
  • the user equipment also includes a power source 1090 (such as a battery) that supplies power to the various components.
  • a power source 1090 such as a battery
  • the power source can be logically coupled to the processor 1080 through a power management system to manage functions such as charging, discharging, and power management through the power management system.
  • the user equipment may further include a camera, a Bluetooth module, and the like, and details are not described herein again.
  • the processor 1080 included in the user equipment further has the following functions:
  • the RRC connection reconfiguration message of the configuration information is accessed by the RF circuit 1010 according to the configuration information.
  • FIG. 11 is a schematic structural diagram of a communication device according to an embodiment of the present disclosure.
  • the communication device 1100 may have a large difference due to different configurations or performances, and may include one or more central processing units (CPUs) 1122. (eg, one or more processors) and memory 1132, one or more storage media 1130 that store application 1142 or data 1144 (eg, one or one storage device in Shanghai).
  • the memory 1132 and the storage medium 1130 may be short-term storage or persistent storage.
  • the program stored on storage medium 1130 may include one or more modules (not shown), each of which may include a series of instruction operations in the communication device.
  • central processor 1122 can be configured to communicate with storage medium 1130, executing a series of instruction operations in storage medium 1130 on communication device 1100.
  • the communication device 1100 can also include one or more power sources 1126, one or more wired or wireless network interfaces 1150, one or more input and output interfaces 1158, and/or one or more operating systems 1141, such as Windows ServerTM, Mac. OS XTM, UnixTM, LinuxTM, FreeBSDTM and more.
  • operating systems 1141 such as Windows ServerTM, Mac. OS XTM, UnixTM, LinuxTM, FreeBSDTM and more.
  • the steps performed by the target primary base station, the source primary base station, and the user equipment in the above embodiments may be based on the communication device configuration shown in FIG.

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Abstract

本申请实施例公开了一种为UE切换主基站的方案：当检测到UE需要从源主基站切换到目标主基站时，源主基站向目标主基站发送切换请求，目标主基站向源主基站发送切换请求确认消息，确认UE可以切换到目标主基站，之后UE接收到源主基站发送的切换信息，UE跟据该切换信息接入目标主基站，与目标主基站建立通信连接。能够减少UE切换主基站的流程，缩短UE切换主基站的时长，提高UE在快速移动的场景下切换主基站的成功率。

Description

一种切换的方法以及设备 技术领域
本申请涉及通信领域，特别涉及一种切换的方法以及设备。
背景技术
第三代合作伙伴计划(3rd generation partnership project，3GPP)协议中引入了双链接(dual connectivity，DC)，即允许用户设备(user equipment，UE)同时使用两个基站进行数据传输，包括一个主基站以及一个辅基站。
3GPP中定义了切换主基站的流程。当检测到UE需要从源主基站切换到目标主基站时，例如，UE逐渐远离源主基站的覆盖范围，并且逐渐进入目标主基站的覆盖范围时就可能会发生从源主基站到目标主基站的切换，在主基站切换过程中，源主基站首先向目标主基站发送切换请求，随后目标主基站向辅基站发送添加请求，请求添加该辅基站，目标主基站等待接收到辅基站发送的添加请求回复之后，目标主基站才向源主基站发送切换请求回复，随后源主基站向辅基站发送释放请求，该释放请求用于指示辅基站释放源主基站与辅基站关于UE的连接，之后才向UE发送无线资源控制(radio resource control，RRC)连接重配置消息，UE根据该RRC连接重配置消息获取从源主基站切换到目标主基站的切换信息以及辅基站的配置信息，并从源主基站切换到目标主基站，以及添加辅基站。
因此，当检测到UE需要从源主基站切换到目标主基站时，源主基站向目标主基站发送切换请求后，需要等待目标主基站添加辅基站，UE才能进行主基站切换，等待的时长太长。若UE处于高速移动的状态，若等待时间太长，UE可能已不在目标主基站的覆盖范围内，则UE无法切换到目标主基站，导致切换失败。
申请内容
本申请实施例提供了一种切换的方法、基站、用户设备以及计算机存储介质，能够减少UE切换主基站的流程，缩短UE切换主基站的时长，提高UE在快速移动的场景下切换主基站的成功率。
有鉴于此，本申请实施例的第一方面提供一种切换的方法，可以包括：
目标主基站接收源主基站发送的切换请求，该切换请求用于请求用户设备从源主基站切换到目标主基站，目标主基站确定用户设备可以切换到目标主基站后，无需为该用户设备添加辅基站，根据该切换请求生成切换请求确认消息，并将该切换请求确认消息发送至源主基站，以通知源主基站允许用户设备从源主基站切换到目标主基站，之后目标主基站与用户设备建立通信连接，并在通信连接建立完成后为用户设备添加辅基站。
在本申请实施例中，目标主基站在接收到源主基站发送的切换请求后，获取到源主基站请求将用户设备从该源主基站切换到目标主基站，此时目标主基站为用户设备添加辅基站，直接生成切换请求确认消息，并将该切换请求确认消息发送至源主基站，以通知源主基站允许将用户设备求换到目标主基站，与用户设备建立通信连接后，再为用户设备添加辅基站，能够减少用户设备切换主基站的流程，可以减少用户设备切换主基站的时长，提供用户设备在高速移动时，切换主基站的成功率。
结合本申请实施例的第一方面，在本申请实施例的第一方面的第一种实现方式中，目标主基站为所述用户设备添加辅基站，可以包括：
目标主基站向辅基站发送添加请求，之后接收到辅基站发送的添加确认信息，目标主基站通过该添加确认信息获取到辅基站允许所述目标主基站添加辅基站，目标主基站向用户设备发送该辅基站的配置信息，以使得所述用户设备根据该配置信息接入该辅基站。
在本申请实施例中，目标主基站在于用户设备建立通信连接后，为用户设备添加辅基站，可以先向辅基站发送添加请求，在接收到辅基站发送的添加确认信息后，目标主基站为用户设备添加辅基站，用户设备重新接入该辅基站，提供了一种目标主基站为用户设备添加辅基站的具体方式。
结合本申请实施例的第一方面的第一种实现方式，本申请实施例的第一方面的第二种实现方式中，目标主基站向所述用户设备发送辅基站的配置信息，可以包括：
目标主基站向所述用户设备发送RRC连接重配置消息，该RRC连接重配置消息包括辅基站的配置信息，用户设备可以根据该配置信息接入该辅基站。
在本申请实施例中，目标主基站通过RRC连接重配置消息将辅基站的配置信息发送至源主基站，以使得用户设备可以根据该配置信息接入辅基站。
本申请实施例第二方面提供了一种切换的方法，可以包括：
源主基站在确认用户设备需要切换到目标主基站后，向目标主基站发送切换请求，请求将用户设备从源主基站切换到目标主基站，在目标主基站为用户设备添加辅基站之前，源主基站接收所述目标主基站发送的切换请求确认消息，源主基站通过该切换请求确认消息获取到目标主架子允许所述用户设备切换到目标主基站，随后源主基站通知用户设备切换到所述目标主基站，以使得用户设备与目标主基站建立通信连接。
在本申请实施例中，源主基站确认用户设备需要切换到目标主基站后，向目标主基站发送切换请求，请求将用户设备切换到目标主基站，在目标主基站为用户设备添加辅基站之前，源主基站接收到目标主基站发送的切换请求确认消息，通过该切换请求确认消息获取到目标主基站允许用户设备切换到目标主基站，目标主基站在为用户设备添加辅基站之前发送该切换请求确认消息，无需在发送该切换请求确认消息前为用户设备添加辅基站，减少了用户设备的切换流程，可以缩短了用户设备切换主基站的时长，可以提高用户设备切换主基站的成功率。
结合本申请实施例的第二方面，在本申请实施例的第二方面的第一种实施方式中，源主基站通知该用户设备切换到该目标主基站，可以包括：
该源主基站向该用户设备发送RRC连接重配置消息，该RRC连接重配置消息包括该用户设备从该源主基站切换到目标主基站的切换信息，以使得该用户设备根据该切换信息从该源主基站切换到该目标主基站。为源主基站通知用户设备切换到目标主基站的其中一种方式。
结合本申请实施例的第二方面或本申请实施例的第二方面的第一种实施方式，在本申请实施例的第二方面的第二种实施方式中，源主基站通知用户设备切换到目标主基站之后，源主基站向所述辅基站发送释放请求，该释放请求用于指示释放源主基站与辅基站关于用 户设备的连接。
本申请实施例第三方面提供了一种切换的方法，可以包括：
用户设备接收源主基站发送的通知信息，该通知信息包括该用户设备从该源主基站切换到该目标主基站的切换信息，该通知信息是该源主基站在接收到目标主基站发送的切换请求确认消息后发送的，该切换请求确认消息是该目标主基站为该用户设备添加辅基站之前发送的，该切换请求确认消息用于指示允许该用户设备从该源主基站切换到该目标主基站，该用户设备根据该通知信息与该目标主基站建立通信连接。
在本申请实施例中，目标主基站在为用户设备添加辅基站之前，向源主基站发送切换请求确认消息，减少了用户设备切换主基站时添加辅基站的流程，可以缩短了用户设备切换主基站的时长，可以提高用户设备切换主基站的成功率。
结合本申请实施例第三方面，在本申请实施例第三方面的第一种实施方式中，用户设备根据所述通知信息与所述目标主基站建立连接之后，用户设备接收目标主基站发送的第一RRC连接重配置消息，该第一RRC连接重配置消息包括辅基站的配置信息，用户设备根据该配置信息接入辅基站。
在本申请实施例中，用户设备与目标主基站建立通信连接后，才接入辅基站，在用户设备切换主基站时无需添加辅基站，减少了用户设备在切换主基站时添加辅基站的流程，可以缩短用户设备切换主基站的流程，提高用户设备切换主基站的成功率。
结合本申请实施例的第三方面或本申请实施例第三方面的第一种实施方式，在本申请实施例的第二种实施方式中，用户设备根据通知信息与目标主基站建立连接，可以包括：
用户设备接收源主基站发送的第二RRC连接重配置消息，该第二RRC连接重配置消息中包括切换到目标主基站的切换信息，用户设备根据该切换信息接入目标主基站，与目标主基站建立通信连接。
本申请实施例第四方面提供一种基站，具有实现对应于上述第一方面或第一方面任一实施方式提供的切换的方法中目标主基站的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
本申请实施例第五方面提供一种基站，具有实现对应于上述第二方面或第二方面任一实施方式提供的切换的方法中源主基站的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
本申请实施例第六方面提供一种用户设备，具有实现对应于上述第三方面或第三方面任一实施方式提供的切换的方法中用户的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
本申请实施例第七方面提供一种基站，可以包括：
处理器、存储器、总线以及输入输出接口，该处理器、该存储器与该输入输出接口通过该总线连接；
该存储器，用于存储程序代码；
该处理器调用该存储器中的程序代码时执行本申请第一方面或第一方面任一实施方式提供的目标主基站执行的步骤。
本申请实施例第七方面提供一种基站，可以包括：
处理器、存储器、总线以及输入输出接口，该处理器、该存储器与该输入输出接口通过该总线连接；
该存储器，用于存储程序代码；
该处理器调用该存储器中的程序代码时执行本申请第二方面或第二方面任一实施方式提供的源主基站执行的步骤。
本申请实施例第八方面提供一种用户设备，可以包括：
处理器、存储器、总线以及输入输出接口，该处理器、该存储器与该输入输出接口通过该总线连接；
该存储器，用于存储程序代码；
该处理器调用该存储器中的程序代码时执行本申请第三方面或第三方面任一实施方式提供的用户设备执行的步骤。
本申请实施例第九方面提供一种通信系统，该通信系统包括目标主基站以及源主基站，该目标主基站为执行本申请第一方面至第三方面中任一实施方式中的目标主基站；该源主基站为执行本申请第一方面至第三方面中任一实施方式中的源主基站；该用户设备为执行本申请第一方面至第三方面中任一实施方式中的用户设备。
本申请实施例第十方面提供一种存储介质，需要说明的是，本发的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产口的形式体现出来，该计算机软件产品存储在一个存储介质中，用于储存为上述设备所用的计算机软件指令，其包含用于执行上述第一方面至第三方面中任一方面为目标主基站、源主基站或用户设备所设计的程序。
该存储介质包括：U盘、移动硬盘、只读存储器(英文缩写ROM，英文全称：Read-Only Memory)、随机存取存储器(英文缩写：RAM，英文全称：Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
本申请实施例第十一方面提供一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行如本申请第一方面或第一方面任一可选实施方式中所述的方法。
本申请实施例第十二方面提供一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行如本申请第二方面或第二方面任一可选实现方式中所述的方法。
本申请实施例第十三方面提供一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行如本申请第三方面或第三方面任一可选实现方式中所述的方法。
本申请第十四方面提供一种通信装置，包括处理元件以及存储元件，其中所述存储元件用于存储程序，当所述程序被所述处理元件调用时，用于执行第一方面或第一方面任一实施方式中所述的方法。
本申请第十五方面提供一种通信装置，包括处理元件以及存储元件，其中所述存储元件用于存储程序，当所述程序被所述处理元件调用时，用于执行第二方面或第二方面任一实施方式中所述的方法。
本申请第十六方面提供一种通信装置，包括处理元件以及存储元件，其中所述存储元 件用于存储程序，当所述程序被所述处理元件调用时，用于执行第三方面或第三方面任一实施方式中所述的方法。
本申请实施例提供的技术方案中，当目标主基站接收到源主基站发送的切换请求，获知UE需要从源主基站切换到目标主基站后，直接回复该切换请求，允许UE从源主基站切换到目标主基站，随后直接与该UE建立连接，减少了目标主基站添加辅基站的延迟。
附图说明
图1为本申请实施例中的一种网络架构示意图；
图2为本申请实施例中的数据传输以及协议栈示意图；
图3为本申请实施例中的应用场景示意图；
图4为本申请实施例中的切换的方法的一种实施例示意图；
图5为本申请实施例中的切换的方法的另一种实施例示意图；
图6为本申请实施例中基站的一种实施例示意图；
图7为本申请实施例中基站的另一种实施例示意图；
图8为本申请实施例中用户设备的一种实施例示意图；
图9为本申请实施例中基站的另一种实施例示意图；
图10为本申请实施例中用户设备的另一种实施例示意图；
图11为本申请实施例中通信装置的一种实施例示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。
请参阅图1，本申请实施例中的一种网络架构示意图。
在本申请实施例适用的网络架构中，UE可以同时连接至少两个基站。其中，接入网可以包括长期演进(long term evolution，LTE)系统中的演进的通用陆基无线接入网(evolved universal terrestrial radio access network，EUTRAN)、LTE-NR(new radio，新的无线接入)中的非独立组网(non-standalone，NSA)，或除LTE系统外UE可以同时连接至少两个基站，并可以使用该至少两个基站进行数据传输的系统的接入网。其中，移动性管理实体(mobile management entity，MME)以及服务网关(serving gateway，S-GW)为核心网内网元，MME以及S-GW分别与接入网中的主基站之间建立连接，主基站被作为核心网的移动锚点。主基站与辅基站之间建立连接，辅基站可与UE进行数据传输。UE与主基站以及辅基站之间均建立有无线Uu口，该接口可用于传输UE发送以及接收的数据，即UE可以通过主基站与辅基站进行数据传输，网络的数据吞吐量得到了提升，提高了UE的通信效率。本申请实施例提供了一种快速切换主基站的方法、基站以及UE，使UE能够快速的从源主基站切换到目标主基站。当UE在高速移动，并且穿越主基站之间的覆盖范围时，能够快速切换主基站，提高UE切换主基站的成功率。
需要说明的是，本申请提供的技术方案可以适用于长期演进(Long Term Evolution，简称LTE)系统，或其他采用各种无线接入技术的无线通信系统，例如采用码分多址，频分 多址，时分多址，正交频分多址，单载波频分多址等接入技术的系统。此外，还可以适用于使用LTE系统后续的演进系统，如第五代5G系统等。具体此处不作限定。
以LTE的EUTRAN或者LTE-NR的NSA为例，图1所示的网络架构下的其中一种数据传输以及协议栈如图2所示。其中，主小区承载(MCG bearer)的协议栈仅位于主基站，即该承载仅使用主基站进行数据传输；分叉承载(Split bearer)的协议栈位于主基站以及辅基站中，即该承载可同时使用主基站与辅基站进行数据传输；从小区承载(SCG bearer)的协议栈仅位于辅基站中，即该承载仅使用辅基站进行数据传输。Split bearer在主基站中配置一个数据包汇聚协议(packet data convergence protocol，PDCP)实体，以及两个分别位于主基站与辅基站的无线链路控制(radio link control，RLC)实体，还包括分别位于主基站与辅基站的、媒体接入控制(medium access control，MAC)实体和物理层(physical layer，PHY)，以下行数据为例，主基站中的PDCP将部分PDCP协议数据单元(protocol data unit，PDU)通过X2或Xn接口(LTE的EUTRAN中为X2，LTE-NR的NSA中为Xn)发送至辅基站中的RLC实体，之后由辅基站中的RLC实体进行下一步发送，另一部分发送至主基站中的RLC实体，之后由主基站中的RLC实体进行下一步发送。MCG bearer则直接由主基站中的PDCP将PDU直接下发至RLC实体，之后由主基站中的RLC实体进行下一步发送。SCG bearer则直接由辅基站中的PDCP将PDU直接下发至RLC实体，之后由辅基站中的RLC实体进行下一步发送。
在LTE的EUTRAN中，主基站可以是MeNB(master evolved Node B，主基站)，辅基站可以是SeNB(secondary evolved Node B，辅基站)，类似地，在LTE-NR的NSA中，主基站可以是MgNB(master gNode B，主基站)，辅基站可以是SgNB(secondary gNode B，辅基站)。
请参阅图3，本申请实施例中的应用场景示意图。UE与源主基站以及辅基站均建立通信连接，使用源主基站以及辅基站进行数据传输，在实际应用中，若UE从源主基站的覆盖范围移动到目标主基站的覆盖范围，UE接收到目标主基站的目标信号的信号强度越来越强，而UE接收到源主基站的源信号的信号强度越来约弱，当目标信号的信号强度大于阈值或源信号的信号强度低于阈值，或源主基站将被关闭，可以是由UE本身发起主基站切换，也可以是由源主基站检测到UE的移动后发起主基站切换，具体此处不作限定。需要说明的是，本申请实施例中的源主基站与目标主基站可以是LTE的EUTRAN中的MeNB，也可以是LTE-NR中的MgNB，还可以是其他包括DC场景的系统中的主基站，具体此处不做限定，辅基站可以是LTE的EUTRAN中的SeNB，也可以是LTE-NR中的SgNB，还可以是其他包括DC场景的系统中的辅基站，具体此处不做限定。
请参阅图4，本申请实施例中的切换的方法的一种实施例示意图，包括：
401、源主基站向目标主基站发送切换请求；
UE当前附着于源主基站，当源主基站检测到UE从源主基站的覆盖范围移动到目标主基站的覆盖范围之后、当源主基站检测到目标主基站的信号强度大于阈值或大于源主基站的信号强度之后或当UE检测到目标主基站的信号强度大于阈值或大于源主基站的信号强度，并向源主基站发送切换请求之后，源主基站向目标主基站发送切换请求，目标主基站 通过该切换请求获取到源主基站请求将UE切换到目标主基站。
402、目标主基站向源主基站发送切换请求确认消息；
目标主基站接收到源主基站的切换请求，并确认UE可以切换到目标主基站后，目标主基站向源主基站发送切换请求确认消息，该切换请求确认消息用于通知源主基站允许UE切换到目标主基站。目标主基站在接收到源主基站的切换请求后，无需直接添加UE的辅基站，直接向源主基站发送切换请求确认消息，减少了目标主基站为UE添加辅基站的流程，可以缩短目标主基站与UE建立通信连接的时长。
403、源主基站向UE发送通知信息；
在源主基站确认目标主基站允许UE切换到目标主基站后，源主基站通知UE可以切换到目标主基站，UE接收源主基站发送的通知信息，通过该通知信息获取到从源主基站切换到目标主基站的切换信息。
404、UE与目标主基站建立通信连接；
在目标主基站为UE添加辅基站之前，UE根据通知信息中的切换信息接入目标主基站，与目标主基站建立通信连接，可以使用目标主基站进行数据传输。在本申请实施例中，目标主基站在接收到源主基站发送的切换请求后，确认UE可以切换到目标主基站站，无需为UE添加辅基站，直接向源主基站发送切换请求确认消息，以通知源主基站允许UE切换到目标主基站，源主基站通知UE切换到目标主基站，之后UE与目标主基站建立通信连接。在UE切换主基站时，减少了目标主基站添加辅基站的流程，可以缩短UE切换主基站的时长，提高UE切换主基站的成功率。
405、目标主基站为UE添加辅基站。
在UE成功从源主基站切换到目标主基站后，目标主基站为UE添加辅基站，UE接入辅基站，目标主基站与辅基站建立关于UE的通信连接，UE可以使用主基站与辅基站进行数据传输，提高了网络的数据吞吐量，提高了UE的数据传输效率。
在本申请实施例，目标主基站在接收源主基站发送的切换请求后，获知源主基站请求将UE切换到目标主基站，确认UE可以切换到目标主基站后，在为UE添加辅基站之前，向源主基站发送切换回复信息，以通知源主基站允许UE切换到目标主基站，之后与UE建立通信连接。减少了UE从源主基站切换到目标主基站的流程，缩短了UE从源主基站切换到目标主基站的时长，提高了UE在快速移动下切换主基站的成功率。在UE成功从源主基站切换到目标主基站后，再为UE添加辅基站，使UE能够使用主基站与辅基站进行数据传输，提高数据传输的效率，以及提高UE在快速移动的场景下切换主基站的成功率。
具体的，在日常应用中，小明持有一部移动电话，在下班回家时从B小区开车经过A小区，移动速度为100公里每小时，当移动电话处于B小区时，连接的主基站为主基站C以及辅基站D，辅基站D位于B小区与A小区之间，主基站C的覆盖范围为B小区。当小明从B小区快速移动到A小区时，移动电话接收到主基站C的信号的信号强度越来越弱，接收到主基站E的信号的信号强度越来越强，主基站E的覆盖范围为A小区。此时，主基站C检测到移动电话信号强度的变化，向主基站C发起切换请求，请求将移动电话从主基站C切换到主基站E，主基站E接收到主基站C发送的切换请求后，确认移动电话可以切 换到主基站E，无需添加辅基站，直接向主基站C发送切换请求确认消息，通知主基站C允许移动电话切换到主基站E，主基站C通知移动电话进行切换，并且将切换到主基站E的切换信息发送至移动电话，移动电话根据该切换信息与主基站E建立通信连接，移动电话与主基站E之间能够进行快速切换，无需等待主基站E添加辅基站D后再与移动电话建立连接，若移动电话处于高速移动的状态，可以在主基站处于主基站E的覆盖范围时，快速从主基站C切换到主基站E。主基站E与移动电话成功建立通信连接后，主基站E获取到移动电话的辅基站为辅基站D，之后主基站E为移动电话添加辅基站D，使移动电话可以使用主基站E与辅基站D进行数据传输，提供移动电话的通信效率。
前述对本申请实施例提供的方法进行了说明，下面对本申请实施例提供的方法进行进一步地阐述，需要说明的是，本申请实施例中的源主基站与目标主基站可以是LTE的EUTRAN中的MeNB，也可以是LTE-NR中的MgNB，还可以是其他除LTE外包括DC场景的系统中的主基站，具体此处不做限定，辅基站可以是LTE的EUTRAN中的SeNB，也可以是LTE-NR中的SgNB，还可以是除LTE外其他包括DC场景的系统中的辅基站，具体此处不做限定。请参阅图5，本申请实施例中的切换的方法的另一种实施例示意图，包括：
501、源主基站向目标主基站发送切换请求；
当UE从源主基站的覆盖范围移动到目标主基站的覆盖范围，或源主基站即将被关闭，对附着在该源主基站上的UE进行切换等，源主基站在接收到UE切换到目标主基站的请求、检测到UE移动到目标主基站的覆盖范围或源主基站通过不同途径确定UE需要切换到目标主基站等之后，源主基站向目标主基站发送切换请求，请求将UE从源主基站切换到目标主基站。例如，用户A此时正在开车，用户A使用的移动电话B此时也正在车内，跟随汽车移动，若移动电话B此时连接的主基站为基站C，而随着汽车的行进，移动电话B也跟随移动，从基站C的覆盖范围移动到基站D的覆盖范围，那么，可以由移动电话B或基站C向基站D发起移动电话B将主基站从基站C切换到基站D的请求。还例如，若用户A的移动电话B处于基站C与基站D的共同覆盖范围内，移动电话B连接的主基站为基站C，由于基站C与基站D的覆盖重复率高，基站C的使率低，因此需暂时关闭基站C，那么，移动电话B需要将主基站从基站C切换到基站D，由基站C向基站D发起请求。
502、目标主基站向源主基站发送切换请求确认消息；
目标主基站在接收到源主基站发送的切换请求后，获知源主基站请求将UE切换到目标主基站或UE请求从源主基站切换到目标主基站后，无需为UE添加辅基站，可以直接生成确认信息，该确认信息包括目标主基站允许UE从源主基站切换到自身，并向源主基站发送包含该确认信息的切换请求确认消息，通知源主基站允许UE从源主基站切换到目标主基站。在本申请实施例中，目标主基站在接收到源主基站发送的切换请求后，在目标主基站为UE添加辅基站之前，向源主基站发送切换请求确认消息，减少了UE切换主基站时添加辅基站的流程，可以缩短UE切换主基站的时长。
503、源主基站向UE发送第一RRC连接重配置消息；
源主基站在接收到目标主基站发送的切换请求确认消息后，确定UE可以从源主基站切换到目标主基站，并向UE发送第一RRC连接重配置消息，通知UE切换到目标主基站，该 第一RRC连接重配置消息中包含UE从源主基站切换到目标主基站的切换配置信息。
504、UE随机接入目标主基站；
UE接收到源主基站发送的第一RRC连接重配置消息，获取到从源主基站切换到目标主基站的切换配置信息，根据该切换配置信息随机接入目标主基站。
505、UE向目标主基站发送RRC连接重配置完成消息；
UE接入目标主基站后，还可以向目标主基站发送RRC连接重配置完成消息，通知目标主基站RRC连接重配置完成。
506、目标主基站向辅基站发送辅基站添加请求；
目标主基站接收到UE发送的RRC连接重配置完成消息，确定UE已接入目标主基站后，获取UE的辅基站，并向辅基站发送辅基站添加请求，以向辅基站请求为UE添加该辅基站。
在本申请实施例中，目标主基站在与UE建立通信连接，即UE从源主机成功切换到目标主基站后，才为UE添加辅基站，无需在UE与目标主基站建立通信连接时添加辅基站，减少了为UE添加辅基站的流程，可以缩短UE切换主基站的时长，当UE处于高速移动时，可以提供UE切换主基站的成功率。
507、辅基站向目标主基站发送辅基站添加请求确认消息；
辅基站接收到目标主基站发送的辅基站添加请求，获知目标主基站请求为UE添加该辅基站后，辅基站向目标主基站发送辅基站添加请求确认消息，允许目标主基站为UE添加该辅基站。
508、目标主基站向UE发送第二RRC连接重配置消息；
目标主基站在确认可以为UE添加辅基站后，向UE发送第二RRC连接重配置消息，该第二RRC连接重配置消息中包括该辅基站的配置信息。
509、UE随机接入辅基站；
UE接收到目标主基站发送的第二RRC连接重配置消息后，根据该第二RRC连接重配置消息获取辅基站的配置信息，并根据该配置信息接入辅基站，应理解，UE在切换主基站时，与辅基站的链接可以断开，也可以不断开，若与辅基站的连接未断开，则可以根据该配置信息重新接入该辅基站。
510、UE向目标主基站发送RRC连接重配置完成消息；
UE在成功接入辅基站后，向目标主基站发送RRC连接重配置完成消息，以通知目标主基站UE已接入该辅基站。
511、目标主基站向辅基站发送辅基站重配置完成消息；
目标主基站确认UE已接入辅基站后，还可以向辅基站发送辅基站重配置完成消息，已确定目标主基站已成功为UE添加辅基站。
512、源主基站向目标主基站发送传输数据的序列号；
若UE在切换主基站时，源主基站正在传送数据，包括已经传送了部分数据，剩余部分数据还未传送完成，则源主基站可以将已经发送的数据的PDCP序列号发送至目标主基站，以使目标主基站获知已经传送的数据的序列号，防止数据丢失。例如，在UE进行主基站切换时，源主基站正在进行Split bearer或MCG bearer的数据传输，UE切换到目标主基站 后，源主基站传输的数据传输了三分之一，那么，源主基站将已经传输了的三分之一数据的PDCP序列号以及传输状态发送至目标主基站，以使目标主基站获知该三分之一数据的传输状态。
513、S-GW与源主基站进行数据前传；
S-GW在获知UE在进行数据传输时进行主基站切换，那么S-GW将源主基站已经传输的数据发送至源主基站，之后源主基站将该数据发送至目标主基站。
514、源主基站与目标主基站进行数据前传；
S-GW将源主基站已经传输的数据发送至源主基站之后，源主基站将该数据发送至目标主基站，例如，源主基站将已经传输了三分之一数据，那么，S-GW将该三分之一数据发送至源主基站，之后源主基站将该三分之一数据发送至目标主基站，保持传输数据的完整性，以防止UE切换主基站时出现数据丢失。
515、源主基站向辅基站发送释放请求；
源主基站向辅基站发送释放请求，该释放请求用于告知辅基站删除与源主基站关于UE的连接，保留UE上下文，辅基站可继续使用该UE上下文。
需要说明的是，本申请实施例中步骤515可以在步骤505之后的任一步骤之前或之后执行，此处不作限定。
516、目标主基站向MME发送路径切换请求；
目标主基站向MME发送路径切换请求，以向MME请求变更UE的主基站路径。
517、MME与S-GW进行承载修改；
MME与S-GW对目标主基站的Split bearer或MCG bearer进行修改，包括在目标主基站重新建立Split bearer或MCG bearer。
518、S-GW向目标主基站发送新路径消息；
S-GW与MME确定目标主基站的Split bearer或MCG bearer后，通知目标主基站该Split bearer或MCG bearer。
519、MME向目标主基站发送路径切换请求确认消息；
MME向目标主基站发送路径切换请求确认消息，以确认切换的新路径。
520、目标主基站向源主基站发送UE上下文释放消息；
目标主基站在确认新路径建立之后，即Split bearer或MCG bearer建立后，向源主基站发送UE上下文释放消息，以使源主基站释放UE上下文。
521、源主基站向辅基站发送UE上下文释放消息。
源主基站在释放UE上下文之后，通知辅基站该源主基站已经释放该UE上下文，辅基站可继续使用UE上下文进行未完成的数据传输，UE切换时进行的数据传输可以继续进行传输。
需要说明的是，在本申请实施例中，步骤512-521为可选的步骤。
在本申请实施例中，目标主基站接收到源主基站发送的切换请求后，该切换请求为请求将UE从源主基站切换到目标主基站，目标主基站向源主基站发送切换请求确认消息，以确认允许UE从源主基站切换到目标主基站。在UE从源主基站切换到目标主基站后，目标 主基站才为UE添加辅基站，将辅基站的配置信息发送至UE，使UE接入辅基站。若UE处于移动状态，目标主基站在接收到源主基站的切换请求后，直接回复该切换请求，等待UE从源主基站切换到目标主基站后，目标主基站才为UE添加辅基站，UE无需等待目标主基站添加辅基站后才与UE建立通信连接，减少了UE切换主基站的流程，减少了UE切换主基站的时长。
具体的，用户A的移动电话B处于移动状态，从主基站C的覆盖范围移动到主基站D的覆盖范围，此时，由移动电话B向主基站C发送切换请求后，或当主基站C检测到移动电话B接收到主基站D的信号的强度大于阈值时，由主基站C向主基站D发送切换请求，请求将UE的从主基站C切换到主基站D。主基站D接收到该主基站C发送的切换请求后，获知主基站C请求将UE切换到主基站D，此时主基站D无需为移动电话B添加辅基站E，减少为移动电话B添加辅基站的流程，直接向主基站C发送切换请求确认消息，以通知主基站C允许UE切换到主基站D。主基站C将UE切换到主基站D的切换信息包含于RRC连接重配置消息发送至UE，UE可以根据该切换信息接入主基站D，与主基站D建立通信连接。减少了移动电话B从主基站C切换到主基站D的流程，减少了切换时长，提高了移动电话B从主基站C切换到主基站D的成功率。主基站D在确认与移动电话B建立通信连接之后，获取到移动电话B对应辅基站E，并向该辅基站E发送添加请求，以请求为移动电话B添加该辅基站E，在接收到辅基站E的添加请求确认消息后与辅基站E建立关于移动电话B的通信连接，之后向移动电话B发送RRC连接重配置消息，该RRC连接重配置消息中包含了辅基站E的配置信息，移动电话A可以根据该配置信息接入辅基站E。以使移动电话B可以使用主基站D与辅基站E传输数据，提高了移动电话B的数据传输量。另外，主基站D添加辅基站E后，主基站C可以向辅基站E发送辅基站释放请求，辅基站E可以根据该辅基站释放请求释放与主基站C关于移动电话B的连接，同时保留移动电话B的上下文，防止在切换时传送的数据丢失。在移动电话B进行主基站切换时，主基站D在与移动电话B成功建立通信连接后，才为移动电话B添加辅基站E，能够减少移动电话B切换主基站的流程，可以缩短移动电话B在高速移动时
前述对本申请实施例中的切换的方法进行了详细描述，下面对本申请实施例中的装置部分进行叙述。请参阅图6，本申请实施例中基站的一种实施例示意图，包括：
接收单元601，用于接收源主基站发送的切换请求，该切换请求用于请求该用户设备从该源主基站切换到该目标主基站；
发送单元602，用于根据该切换请求向该源主基站发送切换请求确认消息，该切换请求确认消息用于指示允许该用户设备从该源主基站切换到该目标主基站；
处理单元603，用于与该用户设备建立通信连接；
处理单元603，还用于为该用户设备添加辅基站。
可选地，在一些可能的设计中，
发送单元602，还用于向该辅基站发送添加请求；
接收单元601，还用于接收该辅基站发送的添加确认信息，该添加确认信息用于指示允许该目标主基站添加该辅基站；
发送单元602，还用于向该用户设备发送该辅基站的配置信息，以使得该用户设备根据该配置信息接入该辅基站。
可选地，在一些可能的设计中，
发送单元602，具体用于向该用户设备发送无线资源控制RRC连接重配置消息，该RRC连接重配置消息包括该辅基站的配置信息，该第一连接重配置消息用于指示该用户设备根据该配置信息接入该辅基站。
请参阅图7，本申请实施例中基站的另一种实施例示意图，包括：
发送单元701，用于向目标主基站发送切换请求，该切换请求用于指示请求该用户设备从该源主基站切换到该目标主基站；
接收单元702，用于接收该目标主基站发送的切换请求确认消息，该切换请求确认消息是在该目标主基站为该用户设备添加辅基站之前发送的，该切换请求确认消息用于指示允许该用户设备从该源主基站切换到该目标主基站；
处理单元703，用于通知该用户设备切换到该目标主基站，以使得该用户设备与该目标主基站建立通信连接。
可选地，在一些可能的设计中，
处理单元703，具体用于向该用户设备发送RRC连接重配置消息，该RRC连接重配置消息包括该用户设备从该源主基站切换到目标主基站的切换信息，以使得该用户设备根据该切换信息从该源主基站切换到该目标主基站。
可选地，在一些可能的设计中，
发送单元701，还用于向该辅基站发送释放请求，该释放请求用于指示释放该源主基站与该辅基站关于该用户设备的连接。
请参阅图8，本申请实施例中用户设备的一种实施例示意图，包括：
接收单元801，用于接收该源主基站发送的通知信息，该通知信息包括该用户设备从该源主基站切换到该目标主基站的切换信息，该通知信息是该源主基站在接收到目标主基站发送的切换请求确认消息后发送的，该切换请求确认消息是该目标主基站为该用户设备添加辅基站之前发送的，该切换请求确认消息用于指示允许该用户设备从该源主基站切换到该目标主基站；
处理单元802，用于根据该通知信息与该目标主基站建立通信连接。
可选地，在一些可能的设计中，
接收单元801，在处理单元802根据该通知信息与该目标主基站建立连接之后，还用于接收该目标基站在发送的第一RRC连接重配置消息，该第一RRC连接重配置消息包括该辅基站的配置信息；
处理单元802，还用于根据该接收单元801接收到的第一RRC连接重配置消息中的配置信息接入该辅基站。
可选地，在一些可能的设计中，
接收单元801，还用于接收源主基站发送的第二RRC连接重配置消息，该第二RRC连接重配置消息中包括切换信息；
处理单元802，还用于根据该接收单元801接收到的第二RRC连接重配置消息中的切换信息与该目标主基站建立连接。
图9是本申请实施例中基站的另一种实施例示意图，该基站900可因配置或性能不同而产生比较大的差异，可以包括一个或一个以上中央处理器(central processing units，终端设备U)922(例如，一个或一个以上处理器)和存储器932，一个或一个以上存储应用程序942或数据944的存储介质930(例如一个或一个以上海量存储设备)。其中，存储器932和存储介质930可以是短暂存储或持久存储。存储在存储介质930的程序可以包括一个或一个以上模块(图示没标出)，每个模块可以包括对基站中的一系列指令操作。更进一步地，中央处理器922可以设置为与存储介质930通信，在检测设备900上执行存储介质930中的一系列指令操作。
基站900还可以包括一个或一个以上电源926，一个或一个以上有线或无线网络接口950，一个或一个以上输入输出接口958，和/或，一个或一个以上操作系统941，例如Windows ServerTM，Mac OS XTM，UnixTM，LinuxTM，FreeBSDTM等等。
上述实施例中由基站所执行的步骤可以基于该图9所示的基站结构。
本申请实施例还提供了另一种用户设备，如图10所示，为了便于说明，仅示出了与本申请实施例相关的部分，具体技术细节未揭示的，请参照本申请实施例方法部分。该用户设备可以为包括移动电话、平板电脑、PDA(Personal Digital Assistant，个人数字助理)、POS(Point of Sales，销售终端)、车载电脑等任意终端设备，下面对本申请实施例中的用户设备进行具体说明：
图10示出的是与本申请实施例提供的用户设备的部分结构的框图。参考图10，用户设备包括：射频(Radio Frequency，RF)电路1010、存储器1020、输入单元1030、显示单元1040、传感器1050、音频电路1060、无线保真(wireless fidelity，WiFi)模块1070、处理器1080、以及电源1090等部件。本领域技术人员可以理解，图10中示出的用户设备结构并不构成对用户设备的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
下面结合图10对用户设备的各个构成部件进行具体的介绍：
RF电路1010可用于收发信息或通话过程中，信号的接收和发送，特别地，将基站的下行信息接收后，给处理器1080处理；另外，将设计上行的数据发送给基站。通常，RF电路1010包括但不限于天线、至少一个放大器、收发信机、耦合器、低噪声放大器(Low NoiseAmplifier，LNA)、双工器等。此外，RF电路1010还可以通过无线通信与网络和其他设备通信。上述无线通信可以使用任一通信标准或协议，包括但不限于全球移动通讯系统(Global System of Mobile communication，GSM)、通用分组无线服务(General Packet Radio Service，GPRS)、码分多址(Code Division Multiple Access，CDMA)、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)、长期演进(Long Term Evolution，LTE)、电子邮件、短消息服务(Short Messaging Service，SMS)等。
存储器1020可用于存储软件程序以及模块，处理器1080通过运行存储在存储器1020的软件程序以及模块，从而执行用户设备的各种功能应用以及数据处理。存储器1020可主 要包括存储程序区和存储数据区，其中，存储程序区可存储操作系统、至少一个功能所需的应用程序(比如声音播放功能、图像播放功能等)等；存储数据区可存储根据用户设备的使用所创建的数据(比如音频数据、电话本等)等。此外，存储器1020可以包括高速随机存取存储器，还可以包括非易失性存储器，例如至少一个磁盘存储器件、闪存器件、或其他易失性固态存储器件。
输入单元1030可用于接收输入的数字或字符信息，以及产生与用户设备的用户设置以及功能控制有关的键信号输入。具体地，输入单元1030可包括触控面板1031以及其他输入设备1032。触控面板1031，也称为触摸屏，可收集用户在其上或附近的触摸操作(比如用户使用手指、触笔等任何适合的物体或附件在触控面板1031上或在触控面板1031附近的操作)，并根据预先设定的程式驱动相应的连接装置。可选的，触控面板1031可包括触摸检测装置和触摸控制器两个部分。其中，触摸检测装置检测用户的触摸方位，并检测触摸操作带来的信号，将信号传送给触摸控制器；触摸控制器从触摸检测装置上接收触摸信息，并将它转换成触点坐标，再送给处理器1080，并能接收处理器1080发来的命令并加以执行。此外，可以采用电阻式、电容式、红外线以及表面声波等多种类型实现触控面板1031。除了触控面板1031，输入单元1030还可以包括其他输入设备1032。具体地，其他输入设备1032可以包括但不限于物理键盘、功能键(比如音量控制按键、开关按键等)、轨迹球、鼠标、操作杆等中的一种或多种。
显示单元1040可用于显示由用户输入的信息或提供给用户的信息以及用户设备的各种菜单。显示单元1040可包括显示面板1041，可选的，可以采用液晶显示器(Liquid Crystal Display，LCD)、有机发光二极管(Organic Light-Emitting Diode，OLED)等形式来配置显示面板1041。进一步的，触控面板1031可覆盖显示面板1041，当触控面板1031检测到在其上或附近的触摸操作后，传送给处理器1080以确定触摸事件的类型，随后处理器1080根据触摸事件的类型在显示面板1041上提供相应的视觉输出。虽然在图10中，触控面板1031与显示面板1041是作为两个独立的部件来实现用户设备的输入和输入功能，但是在某些实施例中，可以将触控面板1031与显示面板1041集成而实现用户设备的输入和输出功能。
用户设备还可包括至少一种传感器1050，比如光传感器、运动传感器以及其他传感器。具体地，光传感器可包括环境光传感器及接近传感器，其中，环境光传感器可根据环境光线的明暗来调节显示面板1041的亮度，接近传感器可在用户设备移动到耳边时，关闭显示面板1041和/或背光。作为运动传感器的一种，加速计传感器可检测各个方向上(一般为三轴)加速度的大小，静止时可检测出重力的大小及方向，可用于识别用户设备姿态的应用(比如横竖屏切换、相关游戏、磁力计姿态校准)、振动识别相关功能(比如计步器、敲击)等；至于用户设备还可配置的陀螺仪、气压计、湿度计、温度计、红外线传感器等其他传感器，在此不再赘述。
音频电路1060、扬声器1061，传声器1062可提供用户与用户设备之间的音频接口。音频电路1060可将接收到的音频数据转换后的电信号，传输到扬声器1061，由扬声器1061转换为声音信号输出；另一方面，传声器1062将收集的声音信号转换为电信号，由音频电 路1060接收后转换为音频数据，再将音频数据输出处理器1080处理后，经RF电路1010以发送给比如另一用户设备，或者将音频数据输出至存储器1020以便进一步处理。
WiFi属于短距离无线传输技术，用户设备通过WiFi模块1070可以帮助用户收发电子邮件、浏览网页和访问流式媒体等，它为用户提供了无线的宽带互联网访问。虽然图10示出了WiFi模块1070，但是可以理解的是，其并不属于用户设备的必须构成，完全可以根据需要在不改变申请的本质的范围内而省略。
处理器1080是用户设备的控制中心，利用各种接口和线路连接整个用户设备的各个部分，通过运行或执行存储在存储器1020内的软件程序和/或模块，以及调用存储在存储器1020内的数据，执行用户设备的各种功能和处理数据，从而对用户设备进行整体监控。可选的，处理器1080可包括一个或多个处理单元；优选的，处理器1080可集成应用处理器和调制解调处理器，其中，应用处理器主要处理操作系统、用户界面和应用程序等，调制解调处理器主要处理无线通信。可以理解的是，上述调制解调处理器也可以不集成到处理器1080中。
用户设备还包括给各个部件供电的电源1090(比如电池)，优选的，电源可以通过电源管理系统与处理器1080逻辑相连，从而通过电源管理系统实现管理充电、放电、以及功耗管理等功能。
尽管未示出，用户设备还可以包括摄像头、蓝牙模块等，在此不再赘述。
在本申请实施例中，该用户设备所包括的处理器1080还具有以下功能：
接收源主基站发送的通知信息，并根据该通知信息得到切换到目标主基站的切换信息，然后通过RF电路1010与目标主基站建立通信连接，之后还可以接收目标主基站发送的包含辅基站的配置信息的RRC连接重配置消息，并根据该配置信息通过RF电路1010接入辅基站。
图11是本申请实施例提供的一种通信装置结构示意图，该通信装置1100可因配置或性能不同而产生比较大的差异，可以包括一个或一个以上中央处理器(central processing units，CPU)1122(例如，一个或一个以上处理器)和存储器1132，一个或一个以上存储应用程序1142或数据1144的存储介质1130(例如一个或一个以上海量存储设备)。其中，存储器1132和存储介质1130可以是短暂存储或持久存储。存储在存储介质1130的程序可以包括一个或一个以上模块(图示没标出)，每个模块可以包括对通信装置中的一系列指令操作。更进一步地，中央处理器1122可以设置为与存储介质1130通信，在通信装置1100上执行存储介质1130中的一系列指令操作。
通信装置1100还可以包括一个或一个以上电源1126，一个或一个以上有线或无线网络接口1150，一个或一个以上输入输出接口1158，和/或，一个或一个以上操作系统1141，例如Windows ServerTM，Mac OS XTM，UnixTM，LinuxTM，FreeBSDTM等等。
上述实施例中由目标主基站、源主基站以及用户设备所执行的步骤可以基于该图11所示的通信装置结构。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。 应该理解这样使用的数据在适当情况下可以互换，以便这里描述的实施例能够以除了在这里图示或描述的内容以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。

Claims (18)

  1. 一种切换的方法，其特征在于，包括：
    目标主基站接收源主基站发送的切换请求，所述切换请求用于请求所述用户设备从所述源主基站切换到所述目标主基站；
    所述目标主基站根据所述切换请求向所述源主基站发送切换请求确认消息，所述切换请求确认消息用于指示允许所述用户设备从所述源主基站切换到所述目标主基站；
    所述目标主基站与所述用户设备建立通信连接；
    所述目标主基站为所述用户设备添加辅基站。
  2. 根据权利要求1所述的方法，其特征在于，所述目标主基站为所述用户设备添加辅基站，包括：
    所述目标主基站向所述辅基站发送添加请求；
    所述目标主基站接收所述辅基站发送的添加确认信息，所述添加确认信息用于指示允许所述目标主基站添加所述辅基站；
    所述目标主基站向所述用户设备发送所述辅基站的配置信息，以使得所述用户设备根据所述配置信息接入所述辅基站。
  3. 根据权利要求2所述的方法，其特征在于，所述目标主基站向所述用户设备发送所述辅基站的配置信息，包括：
    所述目标主基站向所述用户设备发送无线资源控制RRC连接重配置消息，所述RRC连接重配置消息包括所述辅基站的配置信息，所述连接重配置消息用于指示所述用户设备根据所述配置信息接入所述辅基站。
  4. 一种切换的方法，其特征在于，包括：
    源主基站向目标主基站发送切换请求，所述切换请求用于指示请求所述用户设备从所述源主基站切换到所述目标主基站；
    所述源主基站接收所述目标主基站发送的切换请求确认消息，所述切换请求确认消息是在所述目标主基站为所述用户设备添加辅基站之前发送的，所述切换请求确认消息用于指示允许所述用户设备从所述源主基站切换到所述目标主基站；
    所述源主基站通知所述用户设备切换到所述目标主基站，以使得所述用户设备与所述目标主基站建立通信连接。
  5. 根据权利要求4所述的方法，其特征在于，所述源主基站通知所述用户设备切换到所述目标主基站，包括：
    所述源主基站向所述用户设备发送RRC连接重配置消息，所述RRC连接重配置消息包括所述用户设备从所述源主基站切换到目标主基站的切换信息，以使得所述用户设备根据所述切换信息从所述源主基站切换到所述目标主基站。
  6. 根据权利要求4或5所述的方法，其特征在于，所述源主基站通知所述用户设备切换到所述目标主基站之后，所述方法还包括：
    所述源主基站向所述辅基站发送释放请求，所述释放请求用于指示释放所述源主基站 与所述辅基站关于所述用户设备的连接。
  7. 一种切换的方法，其特征在于，包括：
    用户设备接收源主基站发送的通知信息，所述通知信息包括所述用户设备从所述源主基站切换到目标主基站的切换信息，所述通知信息是所述源主基站在接收到目标主基站发送的切换请求确认消息后发送的，所述切换请求确认消息是所述目标主基站为所述用户设备添加辅基站之前发送的，所述切换请求确认消息用于指示允许所述用户设备从所述源主基站切换到所述目标主基站；
    所述用户设备根据所述通知信息与所述目标主基站建立通信连接。
  8. 根据权利要求7所述的方法，其特征在于，所述用户设备根据所述通知信息与所述目标主基站建立连接之后，所述方法还包括：
    所述用户设备接收所述目标主基站发送的第一RRC连接重配置消息，所述第一RRC连接重配置消息包括所述辅基站的配置信息；
    所述用户设备根据所述配置信息接入所述辅基站。
  9. 根据权利要求7或8所述的方法，其特征在于，所述用户设备根据所述通知信息与所述目标主基站建立连接，包括：
    所述用户设备接收所述源主基站发送的第二RRC连接重配置消息，所述第二RRC连接重配置消息中包括所述切换信息；
    所述用户设备根据所述切换信息与所述目标主基站建立通信连接。
  10. 一种基站，其特征在于，包括：
    接收单元，用于接收源主基站发送的切换请求，所述切换请求用于请求所述用户设备从所述源主基站切换到所述目标主基站；
    发送单元，用于根据所述切换请求向所述源主基站发送切换请求确认消息，所述切换请求确认消息用于指示允许所述用户设备从所述源主基站切换到所述目标主基站；
    处理单元，用于与所述用户设备建立通信连接；
    所述处理单元，还用于为所述用户设备添加辅基站。
  11. 根据权利要求10所述的基站，其特征在于，包括：
    所述发送单元，还用于向所述辅基站发送添加请求；
    所述接收单元，还用于接收所述辅基站发送的添加确认信息，所述添加确认信息用于指示允许所述目标主基站添加所述辅基站；
    所述发送单元，还用于向所述用户设备发送所述辅基站的配置信息，以使得所述用户设备根据所述配置信息接入所述辅基站。
  12. 根据权利要求11所述的基站，其特征在于，
    所述发送单元，具体用于向所述用户设备发送无线资源控制RRC连接重配置消息，所述RRC连接重配置消息包括所述辅基站的配置信息，所述第一连接重配置消息用于指示所述用户设备根据所述配置信息接入所述辅基站。
  13. 一种基站，其特征在于，包括：
    发送单元，用于向目标主基站发送切换请求，所述切换请求用于指示请求所述用户设备从所述源主基站切换到所述目标主基站；
    接收单元，用于接收所述目标主基站发送的切换请求确认消息，所述切换请求确认消息是在所述目标主基站为所述用户设备添加辅基站之前发送的，所述切换请求确认消息用于指示允许所述用户设备从所述源主基站切换到所述目标主基站；
    处理单元，用于通知所述用户设备切换到所述目标主基站，以使得所述用户设备与所述目标主基站建立通信连接。
  14. 根据权利要求13所述的基站，其特征在于，
    所述处理单元，具体用于向所述用户设备发送RRC连接重配置消息，所述RRC连接重配置消息包括所述用户设备从所述源主基站切换到目标主基站的切换信息，以使得所述用户设备根据所述切换信息从所述源主基站切换到所述目标主基站。
  15. 根据权利要求13或14所述的基站，其特征在于，
    所述发送单元，还用于向所述辅基站发送释放请求，所述释放请求用于指示释放所述源主基站与所述辅基站关于所述用户设备的连接。
  16. 一种用户设备，其特征在于，包括：
    接收单元，用于接收所述源主基站发送的通知信息，所述通知信息包括所述用户设备从所述源主基站切换到所述目标主基站的切换信息，所述通知信息是所述源主基站在接收到目标主基站发送的切换请求确认消息后发送的，所述切换请求确认消息是所述目标主基站为所述用户设备添加辅基站之前发送的，所述切换请求确认消息用于指示允许所述用户设备从所述源主基站切换到所述目标主基站；
    处理单元，用于根据所述通知信息与所述目标主基站建立通信连接。
  17. 根据权利要求16所述的用户设备，其特征在于，
    所述接收单元，在所述处理单元根据所述通知信息与所述目标主基站建立连接之后，还用于接收所述目标主基站在发送的第一RRC连接重配置消息，所述第一RRC连接重配置消息包括所述辅基站的配置信息；
    所述处理单元，还用于根据所述接收单元接收到的第一RRC连接重配置消息中的配置信息接入所述辅基站。
  18. 根据权利要求16或17所述的用户设备，其特征在于，
    所述接收单元，还用于接收所述源主基站发送的第二RRC连接重配置消息，所述第二RRC连接重配置消息中包括所述切换信息；
    所述处理单元，还用于根据所述接收单元接收到的第二RRC连接重配置消息中的切换信息与所述目标主基站建立连接。
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