WO2014169431A1 - 小区切换方法及设备 - Google Patents

小区切换方法及设备 Download PDF

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Publication number
WO2014169431A1
WO2014169431A1 PCT/CN2013/074252 CN2013074252W WO2014169431A1 WO 2014169431 A1 WO2014169431 A1 WO 2014169431A1 CN 2013074252 W CN2013074252 W CN 2013074252W WO 2014169431 A1 WO2014169431 A1 WO 2014169431A1
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WO
WIPO (PCT)
Prior art keywords
user plane
small node
current serving
node
plane data
Prior art date
Application number
PCT/CN2013/074252
Other languages
English (en)
French (fr)
Inventor
李明超
熊新
曹振臻
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 CN201810360526.9A priority Critical patent/CN108650691B/zh
Priority to PCT/CN2013/074252 priority patent/WO2014169431A1/zh
Priority to CN201380002294.5A priority patent/CN104247504B/zh
Priority to EP19160762.1A priority patent/EP3554129B1/en
Priority to EP13882373.7A priority patent/EP2986053B1/en
Priority to ES13882373T priority patent/ES2724239T3/es
Priority to CN201810360595.XA priority patent/CN108419280B/zh
Publication of WO2014169431A1 publication Critical patent/WO2014169431A1/zh
Priority to US14/884,360 priority patent/US9749913B2/en
Priority to US15/061,174 priority patent/US10575221B2/en
Priority to US16/795,106 priority patent/US11638185B2/en

Links

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
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • 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
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • 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
    • 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
    • H04W36/00695—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using split of the control plane or user plane
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/249—Reselection being triggered by specific parameters according to timing information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the embodiments of the present invention relate to communication technologies, and in particular, to a cell handover method and device. Background technique
  • the access node of the small cell is called a small node, and the small node may be a Low Power Node (LPN), an indoor base station (Femto), a low mobility base station (LoMo), a small base station (pico), and the like.
  • LPN Low Power Node
  • Femto indoor base station
  • LiMo low mobility base station
  • pico small base station
  • the small node can be deployed in the edge area of the macro base station.
  • UE User Equipment
  • a split transmission scheme can be adopted, that is, the control plane signaling of the UE is at the source.
  • the base station eNB, evolved Node B
  • the source eNB selects a target eNB for the UE according to the measurement result of the UE and the Radio Resource Management (RRM) information.
  • RRM Radio Resource Management
  • the source eNB controls the UE and The user plane switches to the target eNB, and the LPN forwards the user plane data of the UE buffered in the buffer area to the target eNB.
  • the embodiments of the present invention provide a cell handover method and device, which are used to avoid the problem that a small node transfers a large amount of data to a target eNB during a cell handover process, which causes an increase in transmission resources and a large delay.
  • the present invention provides a cell handover method, including:
  • the target base station eNB Sending a handover request to the target base station eNB, where the handover request includes the current serving small node
  • the handover request includes the current serving small node
  • the context of the user equipment UE and the offloading indication so that the target eNB uses the current serving small node as the user plane serving node after the UE handover, and uses the target eNB as the control plane after the UE handover Service node
  • the target eNB Receiving a handover request acknowledgement sent by the target eNB, where the handover request acknowledgement includes radio resource control RRC reconfiguration information of the UE and offload configuration information of the current serving small node, where the handover request acknowledgement is the target eNB Determining that the UE can be handed over and the current serving small node can be used as the user plane serving node after the UE handover, and the target eNB can be sent as the control plane serving node after the UE handover;
  • the method before the sending the handover request to the target base station eNB, the method includes:
  • an eNB that is a target eNB that is switched by the UE from a pre-obtained small-node shared list, where the small-node sharing list includes sharing the current serving small node Serial number ID of multiple eNBs; or
  • the context of the current serving small node includes:
  • the current service d the identity of the node.
  • the context of the current serving small node further includes:
  • the frequency of use of the current serving small node, system information, and a security algorithm supported by the current serving small node is not limited.
  • the present invention provides a cell handover method, including:
  • the source base station eNB Receiving a handover request sent by the source base station eNB, where the handover request includes a context of the current serving small node, a context of the user equipment UE, and a offload indication;
  • the UE Determining, according to the handover request, whether the UE can be handed over and the current serving small node can be the user plane serving node after the UE handover, and the target eNB can be used as the UE And the changed control plane serving node, if yes, generating radio resource control RRC reconfiguration information of the UE and offload configuration information of the current serving small node;
  • an uplink synchronization message that is sent after the UE completes the traffic distribution configuration according to the RRC reconfiguration information of the UE, and sends a time advance TA and an uplink authorization to the UE;
  • the method further includes:
  • the present invention provides a cell handover method, including:
  • the offloading configuration information includes the target eNB Establishing configuration information required for the bearer and configuration information required to establish a user plane connection with the UE;
  • the user plane data of the cached UE is sent according to the configuration information after the current split configuration and the sending status of the user plane data of the UE.
  • the confirming that the UE completes the offloading configuration includes:
  • the confirming that the UE completes the offloading configuration includes:
  • the cached user plane data of the UE includes cached uplink user plane data and a cached downlink user.
  • the buffered downlink user plane data includes downlink user plane data from the source eNB and a downlink from the target eNB.
  • User face data includes downlink user plane data from the source eNB and a downlink from the target eNB.
  • the present invention provides a base station, including:
  • a sending module configured to send a handover request to the target base station eNB, where the handover request includes a context of the current serving small node, a context of the user equipment UE, and a offloading indication, so that the target eNB uses the current serving small node as the a user plane serving node after the UE handover, and using the target eNB as a control plane serving node after the UE handover;
  • a receiving module configured to receive a handover request acknowledgement sent by the target eNB, where the handover request is Determining, including the radio resource control RRC reconfiguration information of the UE and the offload configuration information of the current serving small node, where the handover request acknowledges that the target eNB determines that the UE can be handed over and the current serving small node can As the user plane serving node after the UE handover, the target eNB may be sent as the control plane serving node after the UE handover;
  • the sending module is further configured to send, to the current serving small node, the offloading configuration information of the current serving small node, and send the RRC reconfiguration information of the UE to the UE, so that the current serving small node and The UE separately performs a traffic distribution configuration.
  • the base station further includes:
  • a determining module configured to determine, according to the measurement report of the UE and the radio resource management RRM information, an eNB that is a target eNB that is switched by the UE from the pre-obtained small-node sharing list, where the small-node sharing list includes a sharing station The sequence ID of the plurality of eNBs currently serving the small node; or, configured to determine, according to the measurement report of the UE and the RRM information, an eNB as the target eNB for the UE handover.
  • the context of the current serving small node includes:
  • the current service d the identity of the node.
  • the context of the current serving small node further includes:
  • the frequency of use of the current serving small node, system information, and a security algorithm supported by the current serving small node is not limited.
  • the present invention provides a base station, including:
  • a receiving module configured to receive a handover request sent by the source base station eNB, where the handover request includes a context of the current serving small node, a context of the user equipment UE, and a offloading indication;
  • a determining module configured to determine, according to the handover request, whether the UE can be handed over, and the current serving small node can be used as the user plane serving node after the UE is switched, and the target eNB can be used as the control plane after the UE is switched.
  • a service node if yes, generating radio resource control RRC reconfiguration information of the UE and offload configuration information of the current serving small node;
  • a sending module configured to send, to the source eNB, a handover request acknowledgement that carries the RRC reconfiguration information of the UE and the offload configuration information of the current serving small node, so that the source eNB uses the RRC of the UE
  • the reconfiguration information is sent to the UE, and the current serving small node is offloaded.
  • the configuration information is sent to the current serving small node.
  • the receiving module is further configured to receive the
  • the uplink synchronization message that is sent by the UE after the completion of the offloading configuration according to the RRC reconfiguration information of the UE; the sending module is further configured to deliver a timing advance TA and an uplink grant to the UE; the receiving module is further configured to receive The UE configures a success message based on the offloading sent by the TA and the uplink grant.
  • the sending module is further configured to send the UE offload configuration success indication to the current serving small node, so that the The current serving small node confirms that the UE completes the offload configuration.
  • the present invention provides a small node, including:
  • a receiving module configured to receive the offloading configuration information sent by the source eNB, where the offloading configuration information is sent by the source eNB after receiving the handover request acknowledgement sent by the target eNB that is switched by the user equipment UE, where the offloading configuration information includes Establishing configuration information required for the bearer with the target eNB and configuration information required to establish a user plane connection with the UE;
  • a buffering module configured to perform a traffic distribution configuration according to the offloading configuration information, and cache user plane data of the UE, and record a sending state of the user plane data of the UE;
  • a sending module configured to send the user plane data of the UE buffered by the cache module according to the configuration information of the self-split configuration and the sending status of the user plane data of the UE after confirming that the UE completes the offload configuration.
  • the receiving module is further configured to receive a UE offload configuration success indication sent by the target eNB;
  • the small node further includes: a first confirmation module, configured to confirm, according to the UE offload configuration success indication, that the UE completes the offload configuration.
  • the receiving module is further configured to receive an uplink synchronization message sent by the UE, where the sending module is further configured to send a timing advance TA and an uplink to the UE.
  • the receiving module is further configured to receive a traffic distribution success message sent by the UE based on the TA and an uplink grant;
  • the small node further includes: a second confirmation module, configured to confirm, according to the offload configuration success message, that the UE completes the offload configuration.
  • a second confirmation module configured to confirm, according to the offload configuration success message, that the UE completes the offload configuration.
  • the sending module is specifically configured to: after confirming that the UE completes the offloading configuration, send the to the UE according to the configuration information after the current split configuration and the sending status of the user plane data of the UE recorded by the cache module.
  • the downlink user plane data buffered by the cache module sends the uplink user plane data cached by the cache module to the target eNB.
  • the downlink user plane data buffered by the cache module includes downlink user plane data from the source eNB and the target eNB from the target eNB. Downstream user plane data;
  • the sending module is specifically configured to: after confirming that the UE completes the offloading configuration, send the to the UE according to the configuration information after the current split configuration and the sending status of the user plane data of the UE recorded by the cache module.
  • the downlink user plane data from the source eNB; after the downlink user plane data from the source eNB is transmitted, the configuration information according to the self-split configuration and the user plane data of the UE recorded by the cache module The transmission status of the downlink user plane data from the target eNB is sent to the UE.
  • the cell handover method and device provided by the embodiment of the present invention by sending a handover request to the target eNB, include the context of the current serving small node, the context of the UE, and the offloading indication in the handover request, so that the target eNB uses the current serving small node as The user plane service node after the UE handover, the target eNB is used as the control plane serving node after the UE handover, so that the transmission of the user plane data is always maintained at the current serving small node, and the control plane is switched by the source eNB to the target eNB. Therefore, the problem that the current serving small node forwards a large amount of data to the target eNB during the cell handover process causes the transmission resource required for the transmission to increase and the delay is large.
  • FIG. 1 is a flowchart of Embodiment 1 of a cell handover method according to the present invention.
  • Embodiment 2 is a flowchart of Embodiment 2 of a cell handover method according to the present invention
  • FIG. 3 is a flowchart of Embodiment 3 of a cell handover method according to the present invention
  • Embodiment 4 is a flowchart of Embodiment 4 of a cell handover method according to the present invention.
  • FIG. 5 is a flowchart of Embodiment 5 of a cell handover method according to the present invention.
  • FIG. 6 is a signaling flowchart of an embodiment of a cell handover method according to the present invention.
  • Embodiment 7 is a schematic structural diagram of Embodiment 1 of a base station according to the present invention.
  • Embodiment 8 is a schematic structural diagram of Embodiment 2 of a base station according to the present invention.
  • Embodiment 9 is a schematic structural diagram of Embodiment 1 of a small node according to the present invention.
  • Embodiment 3 of a base station according to the present invention is a schematic structural diagram of Embodiment 3 of a base station according to the present invention.
  • Embodiment 4 of a base station according to the present invention is a schematic structural diagram of Embodiment 4 of a base station according to the present invention.
  • FIG. 12 is a schematic structural diagram of Embodiment 2 of a small node according to the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention.
  • the embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
  • GSM Global System for Mobile Communications
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • FDMA Frequency Division Multiple Addressing
  • OFDMA Orthogonal Frequency-Division Multiple Access
  • SC-FDMA single carrier FDMA
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • the user equipment involved in the application may be a wireless terminal or a wired terminal, and wireless.
  • the terminal can be a device that provides voice and/or data connectivity to the user, a handheld device with wireless connectivity, or other processing device that is connected to the wireless modem.
  • the wireless terminal can communicate with one or more core networks via a radio access network (eg, RAN, Radio Access Network), which can be a mobile terminal, such as a mobile phone (or "cellular" phone) and with a mobile terminal
  • RAN Radio Access Network
  • the computers for example, can be portable, pocket-sized, handheld, computer-integrated or in-vehicle mobile devices that exchange language and/or data with the wireless access network.
  • a wireless terminal may also be referred to as a system, a Subscriber Unit, a Subscriber Station, a Mobile Station, a Mobile, a Remote Station, an Access Point, Remote Terminal, Access Terminal, User Terminal, User Agent, User Device, or User Equipment.
  • the base station involved in the present application is a generalized base station, including a radio resource management and data scheduling function, and may include a radio network controller (RNC), and may also include one or more on the air interface in the access network.
  • RNC radio network controller
  • the base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network.
  • IP Internet Protocol
  • the base station can also coordinate attribute management of the air interface.
  • the base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station in LTE (NodeB or eNB or e-NodeB, evolutional Node B), this application is not limited.
  • BTS Base Transceiver Station
  • NodeB base station
  • NodeB evolved base station in LTE
  • LTE NodeB or eNB or e-NodeB, evolutional Node B
  • the interface between the eNB and the UE is a Uu interface
  • the interface between the eNB and the UE is a Uu interface
  • the interface between the eNB and the small node is an X3 interface.
  • the cell handover method of the present invention can be applied to a scenario in which the UE is in the same coverage area of the macro base station and the small node.
  • the serial numbers of the following embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.
  • FIG. 1 is a flowchart of Embodiment 1 of a cell handover method according to the present invention.
  • the entity of the cell handover method provided by this embodiment is a source eNB, and the cell handover method in this embodiment may include: 5101.
  • Send a handover request to the target eNB where the handover request includes a context of the current serving small node, a context of the user equipment UE, and a offload indication, so that the target eNB switches the current serving small node as the UE.
  • the user plane service node uses the target eNB as a control plane service node after the UE handover.
  • the current serving small node may be LPN, Femto, LoMo, pico, etc.
  • the current serving small node refers to a small node that currently provides user plane services for the UE.
  • the current serving small node may be a small node that is within a coverage area of a plurality of macro base stations.
  • the context of the current serving small node may include the identity of the current serving small node, and may also include the frequency of use of the current serving small node, system information, and a security algorithm supported by the current serving small node, and may also be in the handover request. It contains an information element (Information Elements, IE for short) that uniquely defines the number of the UE at the X3 interface.
  • Information Elements IE for short
  • the UE sends a corresponding measurement report to the source eNB, and after receiving the measurement report and the RRM information of the UE, the source eNB determines an eNB as the target eNB for the UE handover.
  • the source eNB may determine, by using a pre-obtained small-node shared list, an eNB as a handover target of the UE, where the small-node shared list includes multiple eNB serial numbers (ID, Identity) sharing the current serving small-node resource. ).
  • the small node sharing list may be established by the current serving small node or by OAM (Operation and Maintenance).
  • the current serving small node stores the small node sharing list and transmits the small node sharing list to each eNB sharing its resources through the X3 interface. Further, the current serving small node may also update the small node sharing list when the small node sharing list changes, that is, when each eNB sharing its resources changes, and transmit the small node sharing list to Each eNB that currently shares its resources.
  • the source eNB may also determine, according to the measurement report and the RRM information of the UE, an eNB as the target eNB of the UE handover, so that the target eNB uses the current serving small node as the UE after handover.
  • the user plane service node and the target eNB serve as control plane service nodes after the UE handover.
  • the target eNB determines that the UE can be handed over and the current serving small node can serve as the user plane serving node after the UE handover, and the target eNB can And sent as the control plane serving node after the UE is switched.
  • the RRC reconfiguration information of the UE may include UE side configuration information related to establishing a user plane connection with the current serving small node and configuration information required for establishing a control plane connection with the target eNB, and is related to establishing a user plane connection with the current serving small node.
  • the UE side configuration information may include a physical cell identifier (PCI, Physical Cell Identity) of the current serving small node, system information, a frequency, a data radio bearer (DRB, a data radio bearer), a transport channel, and a physical channel used by the current serving small node.
  • PCI Physical Cell Identity
  • the configuration information that is currently dedicated to the serving small node, and the configuration information required to establish a control plane connection with the target eNB may include an access preamble dedicated to the target eNB; the current configuration configuration information of the serving small node may include establishing a user plane with the UE.
  • the configuration information required for the connection and the configuration information required to establish a bearer with the target eNB, and the air interface configuration information required for establishing a user plane connection with the UE may include a logical channel, a configuration of a transport channel and a physical channel, a new security algorithm identifier, a new key, establishing a bearer with the target eNB
  • the configuration information may include the X3 interface logical channel, transport channel and physical channel configuration, the new security algorithm identifier, a new key.
  • the source eNB may send the offload configuration information of the current serving small node to the current serving small node, and simultaneously transmit the RRC reconfiguration information of the UE to the UE, so that the current serving small node and the UE respectively Perform a split configuration.
  • the cell handover method provided in this embodiment by sending a handover request to the target eNB, includes the context of the current serving small node, the context of the UE, and the offloading indication in the handover request, so that the target eNB switches the current serving small node as the UE.
  • the user plane service node uses the target eNB as the control plane serving node after the UE is switched, so that the transmission of the user plane data is always maintained at the current serving small node, and the control plane is switched from the source eNB to the target eNB, thereby solving the cell handover process.
  • the problem that the current serving small node forwards a large amount of data to the target eNB causes the transmission resource required for transmission to increase and the delay is large.
  • FIG. 2 is a flowchart of Embodiment 2 of a cell handover method according to the present invention.
  • the eNB is a source eNB
  • the cell switching method in this embodiment may further include:
  • S204 Receive an end tag sent by a serving gateway (S-GW, Serving Gateway).
  • S-GW Serving Gateway
  • the UE sends a offload configuration success message to the target eNB; the target eNB sends a path switch request to the mobility management entity (MME, Mobility Management Entity), indicating that the serving cell of the UE has changed; the MME to the S-GW Sending a modify bearer request, the S-GW switches the transmission path of the downlink data to the target eNB and sends a number of end markers to the source eNB.
  • MME Mobility Management Entity
  • the current serving small node after receiving the end tag and confirming that the source eNB has no resources to deliver, will release the UE-related resources established between the source eNB and the source eNB, for example, the X3 interface resource.
  • S206 Receive a context release request sent by the target eNB, where the context release request is sent by the target eNB after confirming that the downlink path of the S-GW to the UE is completed.
  • the target eNB After receiving the offload configuration success message of the UE, the target eNB sends a path switch request to the MME. After the target eNB receives the path switch request acknowledgement sent by the MME, the target eNB sends a context release request to the source eNB.
  • the current serving small node may not release the UE-related resources established between the current serving small node and the source eNB, but is received by the source eNB after S207.
  • the source eNB sends a resource release request to the current serving small node, so that the current UE is decrypted and the UE is established with the source eNB.
  • the handover request acknowledgement sent by the target eNB to the source eNB carries the UE side configuration information related to establishing the user plane connection with the current serving small node, so that the UE and the current The service small node performs the traffic distribution configuration, and after the UE and the current serving small node complete the traffic distribution configuration, the UE-related resources established between the current serving small node and the source eNB are released, and the context of the source eNB and the UE is released. Saved resources.
  • FIG. 3 is a flowchart of Embodiment 3 of a cell handover method according to the present invention.
  • the entity of the cell handover method provided in this embodiment is the target eNB, and the cell handover method in this embodiment may include:
  • the handover request includes a context of the current serving small node, a context of the user equipment UE, and a offload indication.
  • the handover request may further include a usage frequency of the current serving small node, system information, and a security algorithm supported by the same, and the handover request may further include a information for uniquely defining the number of the UE at the X3 interface. yuan.
  • S302. Determine, according to the handover request, whether the UE can be handed over and the current serving small node can serve as the user plane serving node after the UE handover, and the target eNB can serve as the control plane serving node after the UE handover, and if yes, generate the RRC reconfiguration of the UE. Information and offload configuration information for the current serving small node.
  • the RRC reconfiguration information of the UE is generated only when it is determined that the UE can be handed over and the current serving small node can serve as the user plane serving node after the UE handover, and the target eNB can serve as the control plane serving node after the UE handover.
  • Current distribution configuration information of the small node If it is determined that the UE cannot be handed over, the reason for the handover cannot be indicated in the handover request acknowledgement information; if it is determined that the UE can be handed over but the current serving small node is not available as the user plane serving node after the UE handover, the source eNB is notified to the UE.
  • the control plane and the user plane all switch to the target eNB, and forward the user plane data buffered by the current serving small node.
  • the RRC reconfiguration information carrying the UE and the handover request acknowledgement of the current serving small node are sent to the source eNB, so that the source eNB sends the RRC reconfiguration information of the UE to the UE, and the current serving small node.
  • the offload configuration information is sent to the current serving small node.
  • the RRC reconfiguration information of the UE may include UE side configuration information related to establishing a user plane connection with the current serving small node and configuration information required for establishing a control plane connection with the target eNB, and is related to establishing a user plane connection with the current serving small node.
  • the UE side configuration information may include the PCI of the current serving small node, the system information, the frequency, the DRB, the transmission channel, and the physical channel configuration used by the current serving small node, the access preamble dedicated to the current serving small node, and the establishment of the control with the target eNB.
  • the configuration information required for the interface connection may include an access preamble dedicated to the target eNB; the offload configuration information of the current serving small node may include configuration information required to establish a user plane connection with the UE and configuration information required to establish a bearer with the target eNB,
  • the configuration information required to establish a user plane connection with the UE may include a logical channel associated with the Uu, an interface, a configuration of a transport channel and a physical channel, a new security algorithm identifier, a new key, and a bearer required to establish a bearer with the target eNB.
  • Configuration information may include logical channels, transmissions associated with the X3 interface Configuration of channels and physical channels, new security algorithm identifiers, new keys.
  • the cell handover method after the target eNB receives the handover request, determines whether The current serving small node can be used as the user plane serving node after the UE is switched, and the target eNB can be used as the control plane serving node after the UE is switched. If yes, the RRC reconfiguration information of the UE and the shunt configuration information of the current serving small node are generated.
  • the source eNB switches to the target eNB, thereby solving the problem that the current serving small node forwards a large amount of data to the target eNB during the cell handover process, resulting in an increase in transmission resources and a large delay required for transmission.
  • FIG. 4 is a flowchart of Embodiment 4 of a cell handover method according to the present invention.
  • the executor of the cell handover method provided by this embodiment is a target eNB.
  • the cell handover method of this embodiment may include:
  • the UE may send an uplink synchronization message by using the target eNB dedicated to the target eNB in the RRC reconfiguration information.
  • S406 Send a UE offload configuration success indication to the current serving small node, so that the current serving small node confirms that the UE completes the offload configuration.
  • the embodiment of the present invention includes two implementation scenarios: The first scenario is that the UE initiates uplink synchronization only to the target eNB after completing the offload configuration, and the second scenario is that the UE simultaneously sends the target eNB to the target eNB after completing the offload configuration.
  • the current serving small node initiates uplink synchronization.
  • the target eNB performs step S406 after step S405.
  • the UE sends a traffic distribution configuration success message to the target eNB and the current serving small node respectively after the synchronization is completed.
  • the target eNB does not need to perform step S406.
  • the uplink user plane data of the UE is The transmission path is switched to the target eNB.
  • the target eNB starts to receive the uplink user plane data of the UE sent by the current serving access node, and forwards the uplink user plane data of the UE to the core network (EPC, Evolved Packet Core).
  • EPC Evolved Packet Core
  • S407. Send a path switch request to the MME, indicating that the serving cell of the UE has been changed, so that the MME sends a modify bearer request to the S-GW.
  • the MME After receiving the path switch request sent by the target eNB, the MME sends a modify bearer request to the S-GW, and after completing the handover of the downlink data transmission path, the S-GW sends a modify bearer response to the MME, and the MME receives the modified bearer response. Thereafter, a path switch request acknowledgement is sent to the target eNB.
  • S409 Send a context release request to the source eNB, so that the source eNB releases the context associated with the UE.
  • the handover request acknowledgement sent by the target eNB to the source eNB carries the UE side configuration information related to establishing a user plane connection with the current serving small node, so that the UE and the UE
  • the current service small node performs the traffic distribution configuration
  • the target eNB sends a context release request, so that the source eNB translates the UE-related context, so that the user plane data is transmitted.
  • the control plane is handed over by the source eNB to the target eNB, thereby solving the problem that the current serving small node forwards a large amount of data to the target eNB during the cell handover process, which causes the transmission resource required for transmission to increase and the delay is large. problem.
  • FIG. 5 is a flowchart of Embodiment 5 of a cell handover method according to the present invention.
  • the executor of the cell handover method provided in this embodiment is the current serving small node, and the cell handover method in this embodiment may include:
  • the traffic distribution configuration information is sent by the source eNB after receiving the handover request acknowledgement sent by the target eNB that is switched by the user equipment UE, and the traffic distribution configuration information includes a configuration required to establish a bearer with the target eNB. Information and configuration information required to establish a user plane connection with the UE.
  • the current serving small node is a small node that currently provides services for the UE.
  • S502. Perform flow distribution configuration according to the traffic distribution configuration information, and cache user plane data of the UE and record a transmission state of the user plane data of the UE.
  • the current serving small node performs corresponding shunt configuration according to the received shunt configuration information, and saves the sending status of the user plane data of the UE, that is, the SN Status information, where the SN Status includes the uplink packet data convergence protocol serial number.
  • PDCP SN Packet Data Convergence Protocol Serial Number
  • the transmission status of the receiver and the downlink PDCP SN transmitter used to ensure lossless transmission during handover, and simultaneously cache user plane data of the UE.
  • the user plane data includes data of PDCP SDUs and unallocated SNs, where PDCP SDUs are data of allocated SNs.
  • the user plane data of the cached UE is sent according to the configuration information after the current split configuration and the sending status of the user plane data of the UE.
  • the user plane data of the cached UE may include the buffered uplink user plane data and the buffered downlink user plane data
  • the buffered downlink user plane data may include downlink user plane data from the source eNB and a downlink user plane from the target eNB. data.
  • the current serving small node sends the buffered downlink user plane data to the UE according to the configuration information after the current split configuration and the sending status of the UE user plane data, and sends the buffered uplink user plane data to the target eNB.
  • the downlink user plane data from the source eNB is first sent to the UE, and after the downlink user plane data from the source eNB is sent, the configuration information and the UE are configured according to the self-split configuration.
  • the transmission status of the user plane data transmits downlink user plane data from the target eNB to the UE.
  • the small-node receives the offload configuration information sent by the source eNB to perform the offload configuration, caches the user plane data of the UE, and after confirming that the UE completes the offload configuration, according to the configuration information and the recorded configuration of the self-split configuration.
  • the user plane data of the UE is sent, and the user plane data of the buffered UE is sent, so that the transmission of the user plane data is always maintained at the current serving small node, and the control plane is switched by the source eNB to the target eNB, thereby solving the problem of the cell handover.
  • the problem that the current serving small node forwards a large amount of data to the target eNB causes an increase in transmission resources and a large delay required for transmission.
  • FIG. 6 is a signaling flowchart of a cell handover method according to an embodiment of the present invention. As shown in FIG. 6, the cell handover method provided in this embodiment includes:
  • the source eNB sends a handover request to the target eNB.
  • the source eNB determines, according to the measurement report and the RRM information of the UE, an eNB as a target eNB for the UE handover from the previously obtained small-node shared list, and sends a handover request to the target eNB, where the handover request includes the current serving small node.
  • the target eNB determines whether it is possible to switch. After receiving the handover request sent by the source eNB, the target eNB determines whether the UE can be handed over and the current serving small node can serve as the user plane service node after the UE handover, and the target eNB can serve as the control plane service node after the UE handover. If yes, the RRC reconfiguration information of the UE and the offload configuration information of the current serving small node are generated.
  • the target eNB sends a handover request acknowledgement to the source eNB.
  • the target eNB carries the RRC reconfiguration information of the generated UE and the offload configuration information of the current serving small node in the handover request acknowledgement sent to the source eNB, so that the source eNB sends the RRC reconfiguration information of the UE to the UE, and the current service is performed.
  • the offload configuration information of the small node is sent to the current serving small node.
  • the source eNB sends the offload configuration information to the small node.
  • the offloading configuration information sent by the source eNB to the small node may include configuration information required for establishing a user plane connection with the UE and configuration information required to establish a bearer with the target eNB, so that the small node performs the offload configuration.
  • the source eNB sends RRC reconfiguration information to the UE.
  • the RRC reconfiguration information sent by the source eNB to the UE may include the UE side configuration information related to the establishment of the user plane connection of the current serving small node and the configuration information required to establish a control plane connection with the target eNB, so that the UE performs the offload configuration.
  • S604 and S605 can be executed simultaneously.
  • the small node After receiving the offload configuration information, the small node performs a offload configuration and caches user plane data.
  • the current serving small node performs corresponding shunt configuration according to the received shunt configuration information, and simultaneously caches user plane data of the UE, and stores PDCP SN status information, where the PDCP SN status information includes an uplink PDCP SN receiver and a downlink.
  • the transmission status of the PDCP SN transmitter is used to guarantee lossless transmission during handover.
  • the UE After completing the offload configuration, the UE sends an uplink synchronization message to the target eNB.
  • the UE After completing the offloading configuration, the UE sends the uplink synchronization message to the target eNB by using the dedicated access preamble information of the target eNB in the RRC reconfiguration information.
  • the target eNB sends a TA and an uplink grant to the UE.
  • the target eNB After receiving the uplink synchronization message sent by the UE, the target eNB sends the TA and the uplink authorization to the UE.
  • the UE sends a offload configuration success message to the target eNB based on the TA and the uplink grant.
  • the target eNB sends a UE offload configuration success indication to the small node.
  • control plane of the UE is handed over to the target eNB by the source eNB, and the user plane data transmission is still maintained at the small node.
  • the target eNB sends a path switch request to the MME.
  • the MME sends a modify bearer request to the S-GW.
  • the MME After receiving the path switch request sent by the target eNB, the MME sends a modify bearer request to the S-GW.
  • the S-GW sends a modify bearer response to the MME.
  • the S-GW After receiving the modify bearer request sent by the MME, the S-GW switches the transmission path of the downlink data to the target eNB.
  • the MME sends a path switch request acknowledgement to the target eNB.
  • the MME After receiving the modified bearer response sent by the S-GW, the MME sends a path switch request acknowledgement to the target eNB.
  • the target eNB sends a context release request to the source eNB.
  • the source eNB After receiving the invoice context release request, the source eNB translates the context associated with the UE.
  • the difference from FIG. 6 is that the UE initiates uplink synchronization to the current serving small node while performing S607 ⁇ S609, and sends a traffic distribution configuration success message to the current serving small node, and accordingly, the target eNB does not need to be executed after S609. S610, directly executing S61 1.
  • the source eNB determines the target eNB that the UE switches from the previously obtained small-node shared list, and sends a handover request to the target eNB, so that the target eNB switches the current serving small node as the UE.
  • the user plane service node uses the target eNB as the control plane serving node after the UE is switched, so that the transmission of the user plane data is always maintained at the current serving small node, and the control plane is switched by the source eNB to the target eNB, thereby solving the handover process in the cell.
  • the problem that the current serving small node forwards a large amount of data to the target eNB causes the transmission resource required for transmission to increase and the delay is large.
  • FIG. 7 is a schematic structural diagram of Embodiment 1 of a base station according to the present invention. As shown in Figure , this embodiment provides The base station can include:
  • the sending module 11 is configured to send a handover request to the target eNB, where the handover request includes a context of the current serving small node, a context of the UE, and a offloading indication, so that the target eNB switches the current serving small node as the UE. a subsequent user plane serving node, using the target eNB as a control plane serving node after the UE handover;
  • the receiving module 12 is configured to receive a handover request acknowledgement sent by the target eNB, where the handover request acknowledgement includes radio resource control RRC reconfiguration information of the UE and offload configuration information of the current serving small node, the handover request Confirming that the target eNB determines that the UE can be handed over and the current serving small node can be used as the user plane serving node after the UE handover, and the target eNB can serve as the control plane service node after the UE is switched.
  • the handover request acknowledgement includes radio resource control RRC reconfiguration information of the UE and offload configuration information of the current serving small node
  • the sending module 11 is further configured to send, to the current serving small node, the offloading configuration information of the current serving small node, and send the RRC reconfiguration information of the UE to the UE, so that the current serving small node and the The UE performs the split configuration separately.
  • the base station further includes: a determining module, configured to determine, according to the measurement report and the RRM information of the UE, an eNB as a target eNB that is switched by the UE, from the previously obtained small-node shared list, where the small The node sharing list includes an ID of a plurality of eNBs sharing the current serving small node; or, configured to determine, according to the measurement report of the UE and the RRM information, an eNB as a target eNB for the UE handover.
  • a determining module configured to determine, according to the measurement report and the RRM information of the UE, an eNB as a target eNB that is switched by the UE, from the previously obtained small-node shared list, where the small The node sharing list includes an ID of a plurality of eNBs sharing the current serving small node; or, configured to determine, according to the measurement report of the UE and the RRM information, an eNB as a target eNB for the UE handover
  • the context of the current serving small node includes: an identity of the current serving small node.
  • the context of the current serving small node further includes:
  • the frequency of use of the current serving small node, system information, and a security algorithm supported by the current serving small node is not limited.
  • the base station of this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 1 or FIG. 2, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • FIG. 8 is a schematic structural diagram of Embodiment 2 of a base station according to the present invention.
  • the base station provided in this embodiment may include:
  • the receiving module 21 is configured to receive a handover request sent by the source eNB, where the handover request includes a context of the current serving small node, a context of the UE, and a offloading indication.
  • the determining module 22 is configured to determine, according to the handover request, whether the UE can be switched and The current service d, the node may serve as the user plane serving node after the UE handover, and the target eNB may serve as the control plane serving node after the UE handover, and if yes, generate RRC reconfiguration information of the UE and the Current distribution configuration information of the service small node;
  • the sending module 23 is configured to send, to the source eNB, a handover request acknowledgement that carries the RRC reconfiguration information of the UE and the offload configuration information of the current serving small node, so that the source eNB sends the UE
  • the RRC reconfiguration information is sent to the UE, and the offload configuration information of the current serving small node is sent to the current serving small node.
  • the receiving module 21 is further configured to receive an uplink synchronization message that is sent by the UE after completing the traffic distribution configuration according to the RRC reconfiguration information of the UE, where the sending module 23 is further configured to send the time advance TA and the uplink authorization to the UE.
  • the receiving module 21 is further configured to receive a offload configuration success message sent by the UE based on the TA and the uplink grant.
  • the sending module 23 is further configured to send the UE offload configuration success indication to the current serving small node, so that the current serving small node confirms that the UE completes the offload configuration.
  • the base station of this embodiment may be used to perform the technical solution of the foregoing method embodiment shown in FIG. 3 or FIG. 4, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • FIG. 9 is a schematic structural diagram of Embodiment 1 of a small node according to the present invention.
  • the small nodes provided in this embodiment may include:
  • the receiving module 31 is configured to receive the offloading configuration information that is sent by the source eNB, where the offloading configuration information is sent by the source eNB after receiving the handover request acknowledgement sent by the target eNB that is switched by the UE, where the offloading configuration information includes Determining, by the target eNB, configuration information required for the bearer and configuration information required to establish a user plane connection with the UE;
  • the cache module 32 is configured to perform a traffic distribution configuration according to the traffic distribution configuration information, and cache user plane data of the UE, and record a transmission state of the user plane data of the UE.
  • the sending module 33 is configured to: after confirming that the UE completes the offload configuration, send the user plane of the UE buffered by the cache module 32 according to the configuration information after the self-split configuration and the sending status of the user plane data of the UE data.
  • the receiving module 31 is further configured to receive the UE offload configuration success indication sent by the target eNB.
  • the small node further includes: a first confirmation module, configured to perform, according to the UE, a traffic distribution configuration success indication confirmation The UE completes the offload configuration.
  • the receiving module 31 is further configured to receive an uplink synchronization message sent by the UE, and send a module.
  • Block 33 is further configured to deliver a timing advance TA and an uplink grant to the UE;
  • the receiving module 31 is further configured to receive a offload configuration success message sent by the UE based on the TA and an uplink grant;
  • the small node further includes: a second confirmation module, configured to confirm, according to the offload configuration success message, that the UE completes the offload configuration.
  • the user plane data of the UE buffered by the cache module 32 includes cached uplink user plane data and cached downlink user plane data;
  • the sending module 33 is specifically configured to: after confirming that the UE completes the offload configuration, send the cache module 32 cache to the UE according to the configuration information after the current split configuration and the sending status of the user plane data of the UE recorded by the cache module 32.
  • the downlink user plane data is sent to the target eNB for uplink user plane data buffered by the cache module.
  • the downlink user plane data buffered by the cache module 32 includes downlink user plane data from the source eNB and downlink user plane data from the target eNB;
  • the sending module 33 is specifically configured to: after confirming that the UE completes the offload configuration, send the source to the UE according to the configuration information after the current split configuration and the sending status of the user plane data of the UE recorded by the cache module 32. Determining the downlink user plane data of the source eNB; after the downlink user plane data from the source eNB is transmitted, the configuration information according to the self-split configuration and the transmission status of the user plane data of the UE recorded by the cache module 32 Sending the downlink user plane data from the target eNB to the UE.
  • the small node in this embodiment may be used to perform the technical solution of the method embodiment shown in FIG. 5, and the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 10 is a schematic structural diagram of Embodiment 3 of a base station according to the present invention.
  • the base station provided in this embodiment may include: a transmitter 41 and a receiver 42.
  • the transmitter 41 is configured to send a handover request to the target base station eNB, where the handover request includes a context of the current serving small node, a context of the user equipment UE, and a offloading indication, so that the target eNB uses the current serving small node as a user plane service node after the UE handover, and using the target eNB as a control plane service node after the UE handover;
  • the receiver 42 is configured to receive a handover request acknowledgement sent by the target eNB, where the handover request acknowledgement includes radio resource control RRC reconfiguration information of the UE and offload configuration information of the current serving small node, and the handover request acknowledgement Is that the target eNB determines that the UE can switch And the current serving small node may be sent as the user plane serving node after the UE handover, and the target eNB may be sent as the control plane serving node after the UE handover;
  • the transmitter 41 is further configured to send the current configuration small node to the current serving small node, and send the RRC reconfiguration information of the UE to the UE, so that the current serving small node and The UE separately performs a traffic distribution configuration.
  • the processor is further configured to: determine, according to the measurement report and the RRM information of the UE, an eNB that is a target eNB that is switched by the UE from the pre-obtained small-node sharing list, where the small-node sharing list includes a sharing station.
  • An ID of a plurality of eNBs currently serving the small node or configured to determine, according to the measurement report of the UE and the RRM information, an eNB as a target eNB for the UE handover.
  • the context of the current serving small node includes: an identity of the current serving small node.
  • the context of the current serving small node further includes:
  • the frequency of use of the current serving small node, system information, and a security algorithm supported by the current serving small node is not limited.
  • the base station of this embodiment may be used to perform the technical solution of the method embodiment shown in FIG. 1 or FIG. 2, and the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 11 is a schematic structural diagram of Embodiment 4 of a base station according to the present invention.
  • the base station provided in this embodiment may include: a receiver 51, a processor 52, and a transmitter 53.
  • the receiver 51 is configured to receive a handover request sent by the source base station eNB, where the handover request includes a context of the current serving small node, a context of the user equipment UE, and a offload indication.
  • the processor 52 is configured to determine, according to the handover request, whether the UE can be handed over, and the current serving small node can be used as the user plane serving node after the UE handover, and the target eNB can be used as the UE after handover. a control plane serving node, if yes, generating RRC reconfiguration information of the UE and offload configuration information of the current serving small node;
  • the transmitter 53 is configured to send, to the source eNB, a handover request acknowledgement that carries the RRC reconfiguration information of the UE and the offload configuration information of the current serving small node, so that the source eNB uses the RRC of the UE.
  • the reconfiguration information is sent to the UE, and the offload configuration information of the current serving small node is sent to the current serving small node.
  • the receiver 51 is further configured to receive that the UE is in an RRC according to the UE.
  • the configuration information is used to complete the uplink synchronization message sent by the offloading configuration
  • the transmitter 53 is further configured to send the timing advance TA and the uplink grant to the UE.
  • the receiver 51 is further configured to receive, by the UE, the UE according to the TA and the uplink grant.
  • the traffic distribution configuration success message is further configured to receive that the UE is in an RRC according to the UE.
  • the configuration information is used to complete the uplink synchronization message sent by the offloading configuration
  • the transmitter 53 is further configured to send the timing advance TA and the uplink grant to the UE.
  • the receiver 51 is further configured to receive, by the UE, the UE according to the TA and the uplink grant.
  • the traffic distribution configuration success message is further configured to receive that the UE is in an RRC according to the UE.
  • the configuration information is used to complete the uplink synchronization message sent by the
  • the transmitter 53 is further configured to send the UE offload configuration success indication to the current serving small node, so that the current serving small node confirms that the UE completes the offload configuration.
  • the base station of this embodiment may be used to perform the technical solution of the foregoing method embodiment shown in FIG. 3 or FIG. 4, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • FIG. 12 is a schematic structural diagram of Embodiment 2 of a small node according to the present invention.
  • the small node provided in this embodiment may include: a receiver 61, a processor 62, and a transmitter 63.
  • the receiver 61 is configured to receive the offloading configuration information that is sent by the source eNB, and the offloading configuration information is sent by the source eNB after receiving the handover request acknowledgement sent by the target eNB that is switched by the user equipment UE, where the offloading configuration is performed.
  • the information includes configuration information required to establish a bearer with the target eNB and configuration information required to establish a user plane connection with the UE;
  • the processor 62 is configured to perform a traffic distribution configuration according to the traffic distribution configuration information, and cache user plane data of the UE, and record a transmission state of user plane data of the UE.
  • the transmitter 63 is configured to send the user plane data of the UE buffered by the processor 62 according to the configuration information of the self-split configuration and the sending status of the user plane data of the UE after confirming that the UE completes the offload configuration. .
  • the receiver 61 is further configured to receive the UE offload configuration success indication sent by the target eNB.
  • the processor 62 is further configured to confirm, according to the UE offload configuration success indication, that the UE completes the offload configuration.
  • the receiver 61 is further configured to receive an uplink synchronization message sent by the UE, where the sender 63 is further configured to send a timing advance TA and an uplink authorization to the UE.
  • the receiver 61 is further configured to receive a offload configuration success message sent by the UE based on the TA and an uplink grant;
  • the processor 62 is further configured to confirm, according to the offload configuration success message, that the UE completes the offload configuration.
  • the user plane data of the UE buffered by the processor 62 includes cached uplink user plane data and buffered downlink user plane data;
  • the transmitter 63 is specifically configured to: after confirming that the UE completes the offload configuration, according to the small node Configuring the configuration information after the flow configuration and the sending status of the user plane data of the UE recorded by the processor 62, sending the downlink user plane data buffered by the processor 62 to the UE, and sending the cache module cache to the target eNB. Upstream user plane data.
  • the downlink user plane data buffered by the processor 62 includes downlink user plane data from the source eNB and downlink user plane data from the target eNB;
  • the transmitter 63 is specifically configured to: after confirming that the UE completes the offload configuration, send the source to the UE according to the configuration information after the current split configuration and the sending status of the user plane data of the UE recorded by the processor 62. Determining the downlink user plane data of the source eNB; after the downlink user plane data from the source eNB is transmitted, the configuration information according to the self-split configuration and the transmission status of the user plane data of the UE recorded by the processor 62 Sending the downlink user plane data from the target eNB to the UE.
  • the small node in this embodiment may be used to perform the technical solution of the method embodiment shown in FIG. 5, and the implementation principle and technical effects are similar, and details are not described herein again.

Abstract

本发明实施例提供一种小区切换方法及设备。该方法包括：向目标eNB发送切换请求，以使目标eNB将当前服务小节点作为UE切换后的用户面服务节点、将所述目标eNB作为所述UE切换后的控制面服务节点；接收所述目标eNB发送的切换请求确认；向所述当前服务小节点发送所述当前服务小节点的分流配置信息，并向所述UE发送所述UE的RRC重配置信息，以使所述当前服务小节点和所述UE分别进行分流配置。从而避免在小区切换过程中当前服务小节点将大量数据转发至目标eNB导致传输所需的传输资源增加、时延较大的问题。

Description

小区切换方法及设备
技术领域
本发明实施例涉及通信技术， 尤其涉及一种小区切换方法及设备。 背景技术
随着移动通信技术的快速发展， 移动数据业务流量也急剧增长， 运营商 为解决移动数据业务流量急剧增长的问题， 提出了采用小小区进行分流， 即， 在移动用户较多的地点， 密集部署覆盖范围较小的小小区， 用来支持该区域 产生的巨大业务。 小小区的接入节点称为小节点， 该小节点可以是低功率节 点 ( LPN, Low Power Node )、 室内基站（ Femto )、低移动性基站（ LoMo ) 、 小基站（pico )等。
通常可将小节点部署在宏基站的边缘区域， 当用户设备（UE , User Equipment )位于宏基站和小节点的同覆盖区域下时， 可采用分流传输方案， 即 UE的控制面信令在源基站（ eNB, evolved Node B )传输， 用户面数据在 小节点传输。 若要进行小区切换， 源 eNB根据 UE的测量结果及无线资源管 理（ RRM, Radio Resource Management )信息为 UE选择目标 eNB, 为保证 业务的连续性及无损传输， 源 eNB 将该 UE 的控制面及用户面切换至目标 eNB, 同时 LPN将緩存区中緩存的该 UE的用户面数据转发至目标 eNB。
然而， 由于分流后小节点的緩存区存放的数据将大幅增加， 而当进行小 区切换时， 小节点要将这些数据转发至目标 eNB, 传输所需的传输资源也会 增加， 并且时延较大。 发明内容
本发明实施例提供一种小区切换方法及设备， 用以避免在小区切换过程 中小节点将大量数据转发至目标 eNB导致传输所需的传输资源增加、 时延较 大的问题。
第一方面， 本发明提供一种小区切换方法， 包括：
向目标基站 eNB发送切换请求， 所述切换请求包括当前服务小节点的上 下文、 用户设备 UE的上下文及分流指示， 以使所述目标 eNB将所述当前服 务小节点作为所述 UE切换后的用户面服务节点、 将所述目标 eNB作为所述 UE切换后的控制面服务节点；
接收所述目标 eNB发送的切换请求确认， 所述切换请求确认包括所述 UE的无线资源控制 RRC重配置信息和所述当前服务小节点的分流配置信息， 所述切换请求确认是所述目标 eNB在判断所述 UE可以切换且所述当前服务 小节点可以作为所述 UE切换后的用户面服务节点、 所述目标 eNB可以作为 所述 UE切换后的控制面服务节点后发送的；
向所述当前服务小节点发送所述当前服务小节点的分流配置信息， 并向 所述 UE发送所述 UE的 RRC重配置信息， 以使所述当前服务小节点和所述 UE分别进行分流配置。
在第一方面的第一种可能的实现方式中， 所述向目标基站 eNB发送切换 请求之前， 包括：
根据所述 UE的测量报告和无线资源管理 RRM信息，从预先获得的小节 点共享列表中确定一个 eNB为所述 UE切换的目标 eNB, 所述小节点共享列 表中包括共享所述当前服务小节点的多个 eNB的序列号 ID; 或者，
根据所述 UE的所述测量艮告和所述 RRM信息确定一个 eNB作为所述 UE切换的目标 eNB。
在第一方面的第二种可能的实现方式中， 所述当前服务小节点的上下文 包括：
所述当前服务 d、节点的身份标识。
根据第一方面的第二种可能的实现方式， 在第三种可能的实现方式中， 所述当前服务小节点的上下文还包括：
所述当前服务小节点的使用频率、 系统信息及所述当前服务小节点支持 的安全算法。
第二方面， 本发明提供一种小区切换方法， 包括：
接收源基站 eNB发送的切换请求， 所述切换请求包括当前服务小节点的 上下文、 用户设备 UE的上下文及分流指示；
根据所述切换请求， 判断所述 UE是否可以切换且所述当前服务小节点 可以作为所述 UE切换后的用户面服务节点、 目标 eNB可以作为所述 UE切 换后的控制面服务节点， 若是则生成所述 UE的无线资源控制 RRC重配置信 息和所述当前服务小节点的分流配置信息；
将携带有所述 UE的 RRC重配置信息和所述当前服务小节点的分流配置 信息的切换请求确认发送给所述源 eNB,以使所述源 eNB将所述 UE的 RRC 重配置信息发送给所述 UE、将所述当前服务小节点的分流配置信息发送给所 述当前服务小节点。
在第二方面的第一种可能的实现方式中， 所述将携带有所述 UE的 RRC 重配置信息和所述当前服务小节点的分流配置信息的切换请求确认发送给所 述源 eNB之后， 还包括：
接收所述 UE在根据所述 UE的 RRC重配置信息完成分流配置后发送的 上行同步消息， 向所述 UE下发时间提前量 TA和上行授权；
接收所述 UE基于所述 TA和上行授权发送的分流配置成功消息。
根据第二方面的第一种可能的实现方式， 在第二种可能的实现方式中， 所述接收所述 UE基于所述 TA和上行授权发送的分流配置成功消息之后还包 括：
向所述当前服务小节点发送所述 UE分流配置成功指示， 以使所述当前 服务小节点确认所述 UE完成分流配置。
第三方面， 本发明提供一种小区切换方法， 包括：
接收源基站 eNB发送的分流配置信息， 所述分流配置信息是所述源 eNB 在接收到用户设备 UE切换的目标 eNB发送的切换请求确认后发送的， 所述 分流配置信息包括与所述目标 eNB建立承载所需的配置信息和与所述 UE建 立用户面连接所需的配置信息；
根据所述分流配置信息进行分流配置， 并緩存所述 UE的用户面数据， 记录所述 UE的用户面数据的发送状态；
在确认所述 UE完成分流配置后， 根据自身分流配置后的配置信息及所 述 UE的用户面数据的发送状态， 发送緩存的所述 UE的用户面数据。
在第三方面的第一种可能的实现方式中， 所述确认所述 UE完成分流配 置， 包括：
接收所述目标 eNB发送的 UE分流配置成功指示；
根据所述 UE分流配置成功指示确认所述 UE完成分流配置。 在第三方面的第二种可能的实现方式中， 所述确认所述 UE完成分流配 置， 包括：
接收所述 UE发送的上行同步消息，向所述 UE下发时间提前量 TA和上 行授权；
接收所述 UE基于所述 TA和上行授权发送的分流配置成功消息； 根据所述分流配置成功消息确认所述 UE完成分流配置。
结合第三方面或第三方面的任一种可能的实现方式， 在第三种可能的实 现方式中， 所述緩存的所述 UE的用户面数据包括緩存的上行用户面数据和 緩存的下行用户面数据；
所述根据自身分流配置后的配置信息及所述 UE的用户面数据的发送状 态， 发送緩存的所述 UE的用户面数据， 包括：
根据自身分流配置后的配置信息及所述 UE的用户面数据的发送状态， 向所述 UE发送所述緩存的下行用户面数据， 向所述目标 eNB发送所述緩存 的上行用户面数据。
根据第三方面的第三种可能的实现方式， 在第四种可能的实现方式中， 所述緩存的下行用户面数据包括来自所述源 eNB的下行用户面数据和来自所 述目标 eNB的下行用户面数据；
所述根据自身分流配置后的配置信息及所述 UE的用户面数据的发送状 态， 向所述 UE发送所述緩存的下行用户面数据， 包括：
根据自身分流配置后的配置信息及所述 UE的用户面数据的发送状态， 向所述 UE发送所述来自所述源 eNB的下行用户面数据；
在所述来自所述源 eNB的下行用户面数据发送完成后， 根据自身分流配 置后的配置信息及所述 UE的用户面数据的发送状态，向所述 UE发送所述来 自所述目标 eNB的下行用户面数据。
第四方面， 本发明提供一种基站， 包括：
发送模块， 用于向目标基站 eNB发送切换请求， 所述切换请求包括当前 服务小节点的上下文、用户设备 UE的上下文及分流指示，以使所述目标 eNB 将所述当前服务小节点作为所述 UE切换后的用户面服务节点、 将所述目标 eNB作为所述 UE切换后的控制面服务节点；
接收模块， 用于接收所述目标 eNB发送的切换请求确认， 所述切换请求 确认包括所述 UE的无线资源控制 RRC重配置信息和所述当前服务小节点的 分流配置信息， 所述切换请求确认是所述目标 eNB在判断所述 UE可以切换 且所述当前服务小节点可以作为所述 UE切换后的用户面服务节点、 所述目 标 eNB可以作为所述 UE切换后的控制面服务节点后发送的；
所述发送模块还用于向所述当前服务小节点发送所述当前服务小节点的 分流配置信息， 并向所述 UE发送所述 UE的 RRC重配置信息， 以使所述当 前服务小节点和所述 UE分别进行分流配置。
在第四方面的第一种可能的实现方式中， 所述基站还包括：
确定模块， 用于根据所述 UE的测量报告和无线资源管理 RRM信息，从 预先获得的小节点共享列表中确定一个 eNB为所述 UE切换的目标 eNB, 所 述小节点共享列表中包括共享所述当前服务小节点的多个 eNB的序列号 ID; 或者， 用于根据所述 UE的所述测量报告和所述 RRM信息确定一个 eNB作 为所述 UE切换的目标 eNB。
在第四方面的第二种可能的实现方式中， 所述当前服务小节点的上下文 包括：
所述当前服务 d、节点的身份标识。
根据第四方面的第二种可能的实现方式， 在第三种可能的实现方式中， 所述当前服务小节点的上下文还包括：
所述当前服务小节点的使用频率、 系统信息及所述当前服务小节点支持 的安全算法。
第五方面， 本发明提供一种基站， 包括：
接收模块， 用于接收源基站 eNB发送的切换请求， 所述切换请求包括当 前服务小节点的上下文、 用户设备 UE的上下文及分流指示；
判断模块， 用于根据所述切换请求， 判断所述 UE是否可以切换且所述 当前服务小节点可以作为所述 UE切换后的用户面服务节点、 目标 eNB可以 作为所述 UE切换后的控制面服务节点，若是则生成所述 UE的无线资源控制 RRC重配置信息和所述当前服务小节点的分流配置信息；
发送模块， 用于将携带有所述 UE的 RRC重配置信息和所述当前服务小 节点的分流配置信息的切换请求确认发送给所述源 eNB, 以使所述源 eNB将 所述 UE的 RRC重配置信息发送给所述 UE、 将所述当前服务小节点的分流 配置信息发送给所述当前服务小节点。
在第五方面的第一种可能的实现方式中， 所述接收模块还用于接收所述
UE在根据所述 UE的 RRC重配置信息完成分流配置后发送的上行同步消息； 所述发送模块还用于向所述 UE下发时间提前量 TA和上行授权； 所述接收模块还用于接收所述 UE基于所述 TA和上行授权发送的分流配 置成功消息。
根据第五方面的第一种可能的实现方式， 在第二种可能的实现方式中， 所述发送模块还用于向所述当前服务小节点发送所述 UE分流配置成功 指示， 以使所述当前服务小节点确认所述 UE完成分流配置。
第六方面， 本发明提供一种小节点， 包括：
接收模块， 用于接收源基站 eNB发送的分流配置信息， 所述分流配置信 息是所述源 eNB在接收到用户设备 UE切换的目标 eNB发送的切换请求确认 后发送的， 所述分流配置信息包括与所述目标 eNB建立承载所需的配置信息 和与所述 UE建立用户面连接所需的配置信息；
緩存模块， 用于根据所述分流配置信息进行分流配置， 并緩存所述 UE 的用户面数据， 记录所述 UE的用户面数据的发送状态；
发送模块， 用于在确认所述 UE完成分流配置后， 根据自身分流配置后 的配置信息及所述 UE的用户面数据的发送状态， 发送所述緩存模块緩存的 所述 UE的用户面数据。
在第六方面的第一种可能的实现方式中， 所述接收模块还用于接收所述 目标 eNB发送的 UE分流配置成功指示；
所述小节点还包括： 第一确认模块， 用于根据所述 UE分流配置成功指 示确认所述 UE完成分流配置。
在第六方面的第二种可能的实现方式中， 所述接收模块还用于接收所述 UE发送的上行同步消息， 所述发送模块还用于向所述 UE 下发时间提前量 TA和上行授权；
所述接收模块还用于接收所述 UE基于所述 TA和上行授权发送的分流配 置成功消息；
所述小节点还包括： 第二确认模块， 用于根据所述分流配置成功消息确 认所述 UE完成分流配置。 结合第六方面或第六方面的任一种可能的实现方式， 在第三种可能的实 现方式中， 所述緩存模块緩存的所述 UE的用户面数据包括緩存的上行用户 面数据和緩存的下行用户面数据；
所述发送模块具体用于在确认所述 UE完成分流配置后， 根据自身分流 配置后的配置信息及所述緩存模块记录的所述 UE的用户面数据的发送状态， 向所述 UE发送所述緩存模块緩存的下行用户面数据， 向所述目标 eNB发送 所述緩存模块緩存的上行用户面数据。
根据第六方面的第三种可能的实现方式， 在第四种可能的实现方式中， 所述緩存模块緩存的下行用户面数据包括来自所述源 eNB的下行用户面数据 和来自所述目标 eNB的下行用户面数据；
所述发送模块具体用于在确认所述 UE完成分流配置后， 根据自身分流 配置后的配置信息及所述緩存模块记录的所述 UE的用户面数据的发送状态， 向所述 UE发送所述来自所述源 eNB的下行用户面数据； 在所述来自所述源 eNB的下行用户面数据发送完成后， 根据自身分流配置后的配置信息及所述 緩存模块记录的所述 UE的用户面数据的发送状态，向所述 UE发送所述来自 所述目标 eNB的下行用户面数据。
本发明实施例提供的小区切换方法及设备， 通过向目标 eNB发送切换请 求，在该切换请求中包括当前服务小节点的上下文、 UE的上下文及分流指示， 以使目标 eNB将当前服务小节点作为 UE切换后的用户面服务节点、 将所述 目标 eNB作为所述 UE切换后的控制面服务节点， 使得用户面数据的传输一 直维持在当前服务小节点， 控制面由源 eNB切换至目标 eNB, 从而解决了在 小区切换过程中当前服务小节点将大量数据转发至目标 eNB导致传输所需的 传输资源增加、 时延较大的问题。 附图说明
实施例或现有技术描述中所需要使用的附图作一简单地介绍， 显而易见 地， 下面描述中的附图是本发明的一些实施例， 对于本领域普通技术人员 来讲， 在不付出创造性劳动性的前提下， 还可以根据这些附图获得其他的 附图。 图 1为本发明小区切换方法实施例一的流程图
图 2为本发明小区切换方法实施例二的流程图
图 3为本发明小区切换方法实施例三的流程图
图 4为本发明小区切换方法实施例四的流程图
图 5为本发明小区切换方法实施例五的流程图
图 6为本发明小区切换方法实施例的一种信令流程图
图 7为本发明基站实施例一的结构示意图；
图 8为本发明基站实施例二的结构示意图；
图 9为本发明小节点实施例一的结构示意图；
图 10为本发明基站实施例三的结构示意图；
图 11为本发明基站实施例四的结构示意图；
图 12为本发明小节点实施例二的结构示意图。 具体实施方式 为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本 发明实施例中的附图， 对本发明实施例中的技术方案进行清楚、 完整地描 述，显然， 所描述的实施例是本发明一部分实施例， 而不是全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有做出创造性劳动前提 下所获得的所有其他实施例， 都属于本发明保护的范围。
本文中描述的技术可用于各种通信系统， 例如当前 2G, 3G通信系统 和下一代通信系统， 例如全球移动通信系统 （ GSM , Global System for Mobile communications ) , 码分多址 ( CDMA, Code Division Multiple Access ) 系统， 时分多址 （ TDMA, Time Division Multiple Access ) 系统， 宽带码分多址 （WCDMA, Wideband Code Division Multiple Access
Wireless ) , 频分多址 ( FDMA, Frequency Division Multiple Addressing ) 系统， 正交频分多址 ( OFDMA, Orthogonal Frequency-Division Multiple Access )系统，单载波 FDMA( SC-FDMA )系统，通用分组无线业务（ GPRS , General Packet Radio Service )系统,长期演进( LTE, Long Term Evolution ) 系统， 以及其他此类通信系统。
本申请中涉及的用户设备， 可以是无线终端也可以是有线终端， 无线 终端可以是指向用户提供语音和 /或数据连通性的设备，具有无线连接功能 的手持式设备、 或连接到无线调制解调器的其他处理设备。 无线终端可以 经无线接入网 （例如， RAN , Radio Access Network )与一个或多个核心网 进行通信， 无线终端可以是移动终端， 如移动电话 （或称为"蜂窝"电话） 和具有移动终端的计算机， 例如， 可以是便携式、 袖珍式、 手持式、 计算 机内置的或者车载的移动装置， 它们与无线接入网交换语言和 /或数据。例 ^口, 个人通信业务 ( PCS , Personal Communication Service ) 电话、 无绳电 话、会话发起协议（ SIP )话机、无线本地环路（ WLL, Wireless Local Loop ) 站、 个人数字助理 （PDA, Personal Digital Assistant ) 等设备。 无线终端 也可以称为系统、订户单元（ Subscriber Unit )、订户站（ Subscriber Station ) , 移动站（ Mobile Station ) 、 移动台 （Mobile ) 、 远程站（ Remote Station ) 、 接入点（ Access Point )、 远程终端（ Remote Terminal )、接入终端（ Access Terminal ) 、 用户终端 ( User Terminal ) 、 用户代理 ( User Agent ) 、 用户 设备 ( User Device ) 、 或用户装备 ( User Equipment ) 。
本申请中涉及的基站是广义的基站， 包括无线资源管理和数据调度功 能， 可以包括无线网络控制器 （ Radio Network Controller, RNC ) , 还可 以包括接入网中在空中接口上通过一个或多个扇区与无线终端通信的设 备。 基站可用于将收到的空中帧与 IP分组进行相互转换， 作为无线终端 与接入网的其余部分之间的路由器， 其中接入网的其余部分可包括网际协 议（IP ) 网络。 基站还可协调对空中接口的属性管理。 例如， 基站可以是 GSM或 CDMA中的基站 （BTS , Base Transceiver Station ) , 也可以是 WCDMA中的基站 （NodeB ) , 还可以是 LTE中的演进型基站 （ NodeB 或 eNB或 e-NodeB , evolutional Node B ) , 本申请并不限定。
在本发明实施例中， 定义 eNB与 UE之间的接口为 Uu接口， 小节点与 UE之间的接口为 Uu'接口， eNB与小节点之间的接口为 X3接口。 本发明的 小区切换方法可以应用于 UE处于宏基站与小节点的同覆盖区域的场景。 本 发明以下实施例的序号仅仅为了描述， 不代表实施例的优劣。
图 1为本发明小区切换方法实施例一的流程图。 如图 1所示， 本实施例 提供的小区切换方法的执行主体为源 eNB, 本实施例的小区切换方法可以包 括： 5101、 向目标基站 eNB发送切换请求， 所述切换请求包括当前服务小节 点的上下文、 用户设备 UE的上下文及分流指示， 以使所述目标 eNB将所述 当前服务小节点作为所述 UE切换后的用户面服务节点、 将所述目标 eNB作 为所述 UE切换后的控制面服务节点。
具体地， 当前服务小节点可以是 LPN、 Femto、 LoMo、 pico等， 当前服 务小节点是指当前为 UE提供用户面服务的小节点。 该当前服务小节点可以 是处于多个宏基站覆盖区域内的小节点。
进一步地， 所述当前服务小节点的上下文可以包括该当前服务小节点的 身份标识， 还可以包括当前服务小节点的使用频率、 系统信息及当前服务小 节点支持的安全算法，也可以在切换请求中包含一个用于在 X3接口处唯一 定义该 UE的编号的信息元 ( Information Elements , 简称 IE ) 。
需要说明的是， 当小区的信号质量不满足需要时， UE会向源 eNB发 送相应的测量报告， 源 eNB接收到 UE的测量报告和 RRM信息后， 会确 定一个 eNB作为 UE切换的目标 eNB, 可选地， 源 eNB可以从预先获得 的小节点共享列表中确定一个 eNB作为 UE的切换目标，该小节点共享列 表中包含了共享该当前服务小节点资源的多个 eNB序列号（ ID , Identity )。 所述小节点共享列表可由所述当前服务小节点或者由操作和维护 OAM ( Operation and Maintenance )建立。 所述当前服务小节点存储该小节点共 享列表并将该小节点共享列表通过 X3 接口传送给共享其资源的各个 eNB。进一步地，所述当前服务小节点还可以在该小节点共享列表有变化时， 即共享其资源的各 eNB有变化时， 对该小节点共享列表进行更新， 并将该小 节点共享列表传送给当前共享其资源的各个 eNB。
可选地， 源 eNB也可以根据所述 UE的测量 告和 RRM信息确定一个 eNB作为所述 UE切换的目标 eNB, 以使所述目标 eNB将所述当前服务小节 点作为所述 UE切换后的用户面服务节点、 目标 eNB作为所述 UE切换后的 控制面服务节点。
5102、 接收所述目标 eNB发送的切换请求确认， 所述切换请求确认包括 所述 UE的无线资源控制 RRC重配置信息和所述当前服务小节点的分流配置 信息， 所述切换请求确认是所述目标 eNB在判断所述 UE可以切换且所述当 前服务小节点可以作为所述 UE切换后的用户面服务节点、 所述目标 eNB可 以作为所述 UE切换后的控制面服务节点后发送的。
具体地， UE的 RRC重配置信息可以包括与当前服务小节点建立用户面 连接相关的 UE侧配置信息及与目标 eNB建立控制面连接所需的配置信息， 与当前服务小节点建立用户面连接相关的 UE侧配置信息可以包括当前服务 小节点的物理小区标识（PCI, Physical cell Identity ) , 当前服务小节点使用 的系统信息、 频率、 数据无线承载（DRB, Data Radio Bearer ) 、 传输信道及 物理信道的配置， 当前服务小节点专用的接入前导， 与目标 eNB建立控制面 连接所需的配置信息可以包括目标 eNB专用的接入前导； 当前服务小节点的 分流配置信息可以包括与 UE建立用户面连接所需的配置信息及与目标 eNB 建立承载所需的配置信息， 与 UE建立用户面连接所需的空口配置信息可以 包括逻辑信道、 传输信道及物理信道的配置、 新的安全算法标示符、 新的密 钥， 与目标 eNB建立承载所需的配置信息可以包括与 X3接口相关的逻辑信 道、 传输信道及物理信道的配置、 新的安全算法标示符、 新的密钥。
S103、向所述当前服务小节点发送所述当前服务小节点的分流配置信息， 并向所述 UE发送所述 UE的 RRC重配置信息， 以使所述当前服务小节点和 所述 UE分别进行分流配置。
具体地， 源 eNB收到切换请求确认后， 会向当前服务小节点发送的当 前服务小节点的分流配置信息，同时向 UE发送的 UE的 RRC重配置信息， 可以使当前服务小节点和 UE分别进行分流配置。
本实施例提供的小区切换方法， 通过向目标 eNB发送切换请求， 在该切 换请求中包括当前服务小节点的上下文、 UE的上下文及分流指示， 以使目标 eNB将当前服务小节点作为 UE切换后的用户面服务节点、 将目标 eNB作为 UE切换后的控制面服务节点，使得用户面数据的传输一直维持在当前服务小 节点， 控制面由源 eNB切换至目标 eNB, 从而解决了在小区切换过程中当前 服务小节点将大量数据转发至目标 eNB导致传输所需的传输资源增加、 时延 较大的问题。
图 2为本发明小区切换方法实施例二的流程图。 如图 2所示， 本实施例 提供的小区切换方法的执行主体为源 eNB, 在上述实施例的基石出上， 本实施 例的小区切换方法在步骤 S103之后还可以包括：
S204、 接收服务网关（S-GW, Serving Gateway )发送的结束标记。 通常， UE完成分流配置后， 向目标 eNB会发送分流配置成功消息； 目 标 eNB向移动性管理实体 ( MME, Mobility Management Entity )发送路径 切换请求，指示 UE的服务小区已经更改； MME向 S-GW发送修改承载请求， S-GW将下行数据的发送路径切换至目标 eNB并向源 eNB发送若干个结束 标记。
S205、 将结束标记转发给当前服务小节点， 以使当前服务小节点根据 结束标记译放与源 eNB之间建立的与 UE相关的资源。
具体地，当前服务小节点在收到结束标记并确认源 eNB没有资源下发后， 会译放与源 eNB之间建立的与 UE相关的资源， 如， X3接口资源。
S206、 接收目标 eNB发送的上下文译放请求， 上下文译放请求是目标 eNB在确认 S-GW对 UE的下行路径切换完毕后发送的。
通常， 目标 eNB收到 UE的分流配置成功消息后 , 会向 MME发送路径 切换请求，当目标 eNB收到 MME发送的路径切换请求确认后，目标 eNB 会向源 eNB发送上下文译放请求。
S207、 根据上下文释放请求， 释放与 UE相关的上下文。
可选地， 当前服务小节点接收到 S205转发的结束标记时， 也可以先 不释放当前服务小节点与源 eNB之间建立的与 UE相关的资源， 而是在 S207后， 在源 eNB收到目标 eNB发送的上下文译放请求， 释放了与 UE 相关的上下文后， 由源 eNB向当前服务小节点发送资源释放请求， 以使当 前 Λ良务小节点译放与源 eNB之间建立的与 UE相关的资源。
本实施例提供的小区切换方法， 在实施例一的基础上， 在目标 eNB发送 给源 eNB 的切换请求确认中携带与当前服务小节点建立用户面连接相关的 UE侧配置信息， 使 UE和当前服务小节点分别进行分流配置， 并在 UE和当 前服务小节点完成分流配置后， 译放当前服务小节点与源 eNB之间建立的与 UE相关的资源， 释放源 eNB与 UE相关的上下文， 从而节省了资源。
图 3为本发明小区切换方法实施例三的流程图。 如图 3所示， 本实施例 提供的小区切换方法的执行主体为目标 eNB, 本实施例的小区切换方法可以 包括：
S301、 接收源基站 eNB发送的切换请求， 切换请求包括当前服务小节 点的上下文、 用户设备 UE的上下文及分流指示。 具体地， 该切换请求中可以还包含当前服务小节点的使用频率、 系统 信息及其支持的安全算法， 该切换请求中也可以还包含一个用于在 X3接 口处唯一定义该 UE的编号的信息元。
S302、 根据切换请求， 判断 UE是否可以切换且当前服务小节点可以作 为 UE切换后的用户面服务节点、 目标 eNB可以作为所述 UE切换后的控制 面服务节点， 若是则生成 UE的 RRC重配置信息和当前服务小节点的分流配 置信息。
具体地，只有在判断 UE可以切换且当前服务小节点可以作为 UE切换后 的用户面服务节点、目标 eNB可以作为所述 UE切换后的控制面服务节点时， 才生成 UE 的 RRC重配置信息和当前服务小节点的分流配置信息。 若判断 UE不可以切换， 则在切换请求确认信息中指明不能完成切换的原因； 若判断 UE可以切换但当前服务小节点不可以作为 UE切换后的用户面服务节点， 则 通知源 eNB将 UE的控制面和用户面全部切换至目标 eNB , 并对当前服务小 节点緩存的用户面数据进行转发。
S303、将携带有 UE的 RRC重配置信息和当前服务小节点的分流配置信 息的切换请求确认发送给源 eNB, 以使源 eNB将 UE的 RRC重配置信息发 送给 UE、 将当前服务小节点的分流配置信息发送给当前服务小节点。
具体地， UE的 RRC重配置信息可以包括与当前服务小节点建立用户面 连接相关的 UE侧配置信息及与目标 eNB建立控制面连接所需的配置信息， 与当前服务小节点建立用户面连接相关的 UE侧配置信息可以包括当前服务 小节点的 PCI, 当前服务小节点使用的系统信息、 频率、 DRB、 传输信道及 物理信道的配置， 当前服务小节点专用的接入前导， 与目标 eNB建立控制面 连接所需的配置信息可以包括目标 eNB专用的接入前导； 当前服务小节点的 分流配置信息可以包括与 UE建立用户面连接所需的配置信息及与目标 eNB 建立承载所需的配置信息， 与 UE建立用户面连接所需的配置信息可以包括 与 Uu，接口相关的逻辑信道、 传输信道及物理信道的配置、 新的安全算法标 示符、 新的密钥， 与目标 eNB建立承载所需的配置信息可以包括与 X3接口 相关的逻辑信道、 传输信道及物理信道的配置、 新的安全算法标示符、 新的 密钥。
本实施例提供的小区切换方法， 在目标 eNB接收切换请求后， 判断是否 可以切换且当前服务小节点可以作为 UE切换后的用户面服务节点、目标 eNB 可以作为 UE切换后的控制面服务节点， 若是， 则生成 UE的 RRC重配置信 息和当前服务小节点的分流配置信息， 并将携带 UE的 RRC重配置信息和当 前服务小节点的分流配置信息的切换请求确认发送给源 eNB, 以进行小区切 换， 使得用户面数据的传输一直维持在当前服务小节点， 控制面由源 eNB切 换至目标 eNB, 从而解决了在小区切换过程中当前服务小节点将大量数据转 发至目标 eNB导致传输所需的传输资源增加、 时延较大的问题。
图 4为本发明小区切换方法实施例四的流程图。 如图 4所示， 本实施例 提供的小区切换方法的执行主体为目标 eNB, 在上述实施例的基石出上， 本实 施例的小区切换方法在步骤 S303之后可以包括：
S404、 接收 UE在根据 UE的 RRC重配置信息完成分流配置后发送的上 行同步消息， 向 UE下发 TA和上行授权。
具体地， UE完成分流配置后， 可以使用 RRC重配置信息中的目标 eNB 专用的接入前导向目标 eNB发送上行同步消息。
S405、 接收 UE基于 TA和上行授权发送的分流配置成功消息。
5406、 向当前服务小节点发送 UE分流配置成功指示， 以使所述当前服 务小节点确认所述 UE完成分流配置。
需要说明的是， 本发明实施例包括两种实现场景： 第一种场景为 UE在 完成分流配置后仅向目标 eNB发起上行同步， 第二种场景为 UE在完成分流 配置后同时向目标 eNB和当前服务小节点发起上行同步。 在第一种场景中， 目标 eNB在步骤 S405之后执行步骤 S406。 在第二种场景中， UE会在同步 完成后分别向目标 eNB和当前服务小节点发送分流配置成功消息， 对应地， 目标 eNB无需执行步骤 S406。
具体地， 目标 eNB向当前服务小节点发送 UE分流配置成功指示后， 或 者， 目标 eNB和当前服务小节点均接收到 UE在上行同步后发送的分流配置 成功消息后， UE的上行用户面数据的传输路径切换至目标 eNB。
目标 eNB开始接收当前服务接入间节点发送的 UE的上行用户面数据， 将 UE的上行用户面数据转发给核心网 （EPC, Evolved Packet Core ) 。
5407、 向 MME发送路径切换请求， 指示 UE的服务小区已更改， 以使 MME向 S-GW发送修改承载请求。 5408、接收 MME发送的路径切换请求确认，路径切换请求确认是 MME 在接收到 S-GW的修改承载响应后发送给目标 eNB的。
通常， MME接收目标 eNB发送的路径切换请求后， 向 S-GW发送修改 承载请求， S-GW在完成下行数据的传输路径的切换后，会向 MME发送修改 承载响应， MME收到修改承载响应后， 向目标 eNB发送路径切换请求确认。
5409、 向源 eNB发送上下文译放请求， 以使源 eNB译放与 UE相关的 上下文。
本实施例提供的小区切换方法， 在上述实施例的基石出上， 在目标 eNB发 送给源 eNB的切换请求确认中携带与当前服务小节点建立用户面连接相关的 UE侧配置信息， 使 UE和当前服务小节点分别进行分流配置， 并在 UE和当 前服务小节点完成分流配置后，由目标 eNB发送上下文译放请求，以使源 eNB 译放与 UE相关的上下文， 使得用户面数据的传输一直维持在当前服务小节 点， 控制面由源 eNB切换至目标 eNB, 从而解决了在小区切换过程中当前服 务小节点将大量数据转发至目标 eNB导致传输所需的传输资源增加、 时延较 大的问题。
图 5为本发明小区切换方法实施例五的流程图。 如图 5所示， 本实施例 提供的小区切换方法的执行主体为当前服务小节点， 本实施例的小区切换方 法可以包括：
5501、 接收源基站 eNB发送的分流配置信息， 分流配置信息是源 eNB 在接收到用户设备 UE切换的目标 eNB发送的切换请求确认后发送的， 分流 配置信息包括与目标 eNB建立承载所需的配置信息和与 UE建立用户面连接 所需的配置信息。
具体地， 所述当前服务小节点为当前为所述 UE提供服务的小节点。
5502、 根据分流配置信息进行分流配置， 并緩存 UE的用户面数据、 记 录 UE的用户面数据的发送状态。
具体地， 当前服务小节点根据接收到的分流配置信息， 进行相应的分流 配置， 保存 UE的用户面数据的发送状态， 即 SN Status信息， 该 SN Status 包含了上行链路分组数据汇聚协议序列号 （ PDCP SN , Packet Data Convergence Protocol Serial Number )接收机和下行链路 PDCP SN发送机的传 输状态， 用来保证切换过程中的无损传输， 同时緩存 UE的用户面数据， 该 用户面数据包括 PDCP SDUs和未分配 SN的数据， 其中， PDCP SDUs为已 分配 SN的数据。
S503、 在确认 UE完成分流配置后， 根据自身分流配置后的配置信息及 UE的用户面数据的发送状态， 发送緩存的 UE的用户面数据。
具体地， 緩存的 UE的用户面数据可以包括緩存的上行用户面数据和緩 存的下行用户面数据， 緩存的下行用户面数据可以包括来自源 eNB的下行用 户面数据和来自目标 eNB的下行用户面数据。
进一步地， 当前服务小节点根据自身分流配置后的配置信息及 UE的用 户面数据的发送状态， 向 UE发送緩存的下行用户面数据， 向目标 eNB发送 緩存的上行用户面数据。
当前服务小节点在发送緩存的下行用户面数据时， 先向 UE发送来自源 eNB的下行用户面数据， 在来自源 eNB的下行用户面数据发送完成后， 根据 自身分流配置后的配置信息及 UE的用户面数据的发送状态，向 UE发送来自 目标 eNB的下行用户面数据。
本实施例提供的小区切换方法， 小节点接收源 eNB发送的分流配置信息 进行分流配置， 緩存 UE的用户面数据， 并在确认 UE完成分流配置后， 根据 自身分流配置后的配置信息及记录的 UE的用户面数据的发送状态， 发送緩 存的 UE的用户面数据， 使得用户面数据的传输一直维持在当前服务小节点， 控制面由源 eNB切换至目标 eNB,从而解决了在小区切换过程中当前服务小 节点将大量数据转发至目标 eNB导致传输所需的传输资源增加、 时延较大的 问题。
图 6为本发明小区切换方法实施例的一种信令流程图， 如图 6所示， 本 实施例提供的小区切换方法包括：
S601、 源 eNB向目标 eNB发送切换请求。
源 eNB根据 UE的测量报告和 RRM信息， 从预先获得的小节点共享列 表中确定一个 eNB作为 UE切换的目标 eNB，并向该目标 eNB发送切换请求， 所述切换请求中包括当前服务小节点的上下文、 UE的上下文及分流指示， 以 使所述目标 eNB将所述当前服务小节点作为所述 UE切换后的用户面服务节 点、 将目标 eNB作为所述 UE切换后的控制面服务节点。
S602、 目标 eNB判断是否可以切换。 目标 eNB在接收到源 eNB发送的切换请求后，会判断 UE是否可以切换 且当前服务小节点可以作为 UE切换后的用户面服务节点、 目标 eNB可以作 为所述 UE切换后的控制面服务节点， 若是， 则生成 UE的 RRC重配置信息 和当前服务小节点的分流配置信息。
S603、 目标 eNB向源 eNB发送切换请求确认。
目标 eNB将生成的 UE的 RRC重配置信息和当前服务小节点的分流配置 信息携带在发送给源 eNB的切换请求确认中， 以使源 eNB将 UE的 RRC重 配置信息发送给 UE,将当前服务小节点的分流配置信息发送给当前服务小节 点。
S604、 源 eNB向小节点发送分流配置信息。
源 eNB发送发给小节点的分流配置信息中可以包括与 UE建立用户面连 接所需的配置信息及与目标 eNB建立承载所需的配置信息， 以使小节点进行 分流配置。
S605、 源 eNB向 UE发送 RRC重配置信息。
源 eNB发送给 UE的 RRC重配置信息中可以包括与当前服务小节点建立 用户面连接相关的 UE侧配置信息及与目标 eNB建立控制面连接所需的配置 信息， 以使 UE进行分流配置。
S604和 S605可以同时执行。
S606、 小节点接收到分流配置信息后， 进行分流配置， 并緩存用户面数 据。
当前服务小节点根据接收到的分流配置信息， 进行相应的分流配置， 同 时緩存 UE的用户面数据， 并存储 PDCP SN状态信息， 该 PDCP SN状态信 息包含了上行链路 PDCP SN接收机和下行链路 PDCP SN发送机的传输状态， 用来保证切换过程中的无损传输。
S607、 UE完成分流配置后， 向目标 eNB发送上行同步消息。
UE完成分流配置后，使用 RRC重配置信息中的目标 eNB的专用接入前 导信息， 向目标 eNB发送上行同步消息。
S608、 目标 eNB向 UE发送 TA和上行授权。
目标 eNB接收到 UE发送的上行同步消息后， 向 UE发送 TA和上行授 权。 5609、 UE向目标 eNB发送分流配置成功消息。
UE基于 TA和上行授权， 向目标 eNB发送分流配置成功消息。
5610、 目标 eNB向小节点发送 UE分流配置成功指示。
至此， UE的控制面由源 eNB切换至目标 eNB , 而用户面数据传输仍旧 维持在小节点。
S61 1、 目标 eNB向 MME发送路径切换请求。
目标 eNB向 MME发送的路径切换请求， 用以指示 UE的服务小区已更 改。
S612、 MME向 S-GW发送修改承载请求。
接收到目标 eNB发送的路径切换请求后， MME向 S-GW发送修改承载 请求。
S613、 S-GW向 MME发送修改承载响应。
S-GW接收到 MME发送的修改承载请求后，将下行数据的发送路径切换 至目标 eNB。
S614、 MME向目标 eNB发送路径切换请求确认。
MME接收到 S-GW发送的修改承载响应后， 向目标 eNB发送路径切换 请求确认。
S615、 目标 eNB向源 eNB发送上下文译放请求。
源 eNB接收发票上下文译放请求后， 译放与 UE相关的上下文。
另外一种场景， 与图 6不同在于， UE在执行 S607〜S609的同时向当前 服务小节点发起上行同步， 并向当前服务小节点发送分流配置成功消息， 相 应地， 在 S609之后目标 eNB无需执行 S610、 直接执行 S61 1。
本实施例提供的小区切换方法， 源 eNB通过从预先获得的小节点共享 列表中确定 UE切换的目标 eNB , 并向该目标 eNB发送切换请求， 以使目标 eNB将当前服务小节点作为 UE切换后的用户面服务节点、 将目标 eNB作为 UE切换后的控制面服务节点，使得用户面数据的传输一直维持在当前服务小 节点， 控制面由源 eNB切换至目标 eNB , 从而解决了在小区切换过程中当前 服务小节点将大量数据转发至目标 eNB导致传输所需的传输资源增加、 时延 较大的问题。
图 7为本发明基站实施例一的结构示意图。 如图 Ί所示， 本实施例提供 的基站可以包括：
发送模块 11 , 用于向目标 eNB发送切换请求， 所述切换请求包括当前服 务小节点的上下文、 UE的上下文及分流指示， 以使所述目标 eNB将所述当 前服务小节点作为所述 UE切换后的用户面服务节点、 将所述目标 eNB作为 所述 UE切换后的控制面服务节点；
接收模块 12, 用于接收所述目标 eNB发送的切换请求确认， 所述切换请 求确认包括所述 UE的无线资源控制 RRC重配置信息和所述当前服务小节点 的分流配置信息， 所述切换请求确认是所述目标 eNB在判断所述 UE可以切 换且所述当前服务小节点可以作为所述 UE切换后的用户面服务节点、 所述 目标 eNB可以作为所述 UE切换后的控制面服务节点后发送的；
发送模块 11 还用于向所述当前服务小节点发送所述当前服务小节点的 分流配置信息， 并向所述 UE发送所述 UE的 RRC重配置信息， 以使所述当 前服务小节点和所述 UE分别进行分流配置。
可选地， 所述基站还包括： 确定模块， 用于根据所述 UE的测量报告和 RRM信息，从预先获得的小节点共享列表中确定一个 eNB为所述 UE切换的 目标 eNB, 所述小节点共享列表中包括共享所述当前服务小节点的多个 eNB 的 ID; 或者， 用于根据所述 UE的所述测量报告和所述 RRM信息确定一个 eNB作为所述 UE切换的目标 eNB。
进一步地， 所述当前服务小节点的上下文包括： 所述当前服务小节点的 身份标识。
可选地， 所述当前服务小节点的上下文还包括：
所述当前服务小节点的使用频率、 系统信息及所述当前服务小节点支持 的安全算法。
本实施例的基站，可以用于执行图 1或图 2所示方法实施例的技术方案， 其实现原理及技术效果类似， 此处不再贅述。
图 8为本发明基站实施例二的结构示意图。 如图 8所示， 本实施例提供 的基站可以包括：
接收模块 21 , 用于接收源 eNB发送的切换请求， 所述切换请求包括当前 服务小节点的上下文、 UE的上下文及分流指示；
判断模块 22, 用于根据所述切换请求， 判断所述 UE是否可以切换且所 述当前服务 d、节点可以作为所述 UE切换后的用户面服务节点、所述目标 eNB 可以作为所述 UE切换后的控制面服务节点， 若是则生成所述 UE的 RRC重 配置信息和所述当前服务小节点的分流配置信息；
发送模块 23 ,用于将携带有所述 UE的 RRC重配置信息和所述当前服务 小节点的分流配置信息的切换请求确认发送给所述源 eNB, 以使所述源 eNB 将所述 UE的 RRC重配置信息发送给所述 UE、 将所述当前服务小节点的分 流配置信息发送给所述当前服务小节点。
进一步地，接收模块 21还用于接收所述 UE在根据所述 UE的 RRC重配 置信息完成分流配置后发送的上行同步消息， 发送模块 23还用于向 UE下发 时间提前量 TA和上行授权； 接收模块 21还用于接收 UE基于所述 TA和上 行授权发送的分流配置成功消息。
进一步地， 发送模块 23还用于向所述当前服务小节点发送所述 UE分流 配置成功指示， 以使所述当前服务小节点确认所述 UE完成分流配置。
本实施例的基站， 可以用于执行上述图 3或图 4所示方法实施例的技术 方案， 其实现原理及技术效果类似， 此处不再贅述。
图 9为本发明小节点实施例一的结构示意图。 如图 9所示， 本实施例提 供的小节点可以包括：
接收模块 31 , 用于接收源 eNB发送的分流配置信息， 所述分流配置信息 是所述源 eNB在接收到 UE切换的目标 eNB发送的切换请求确认后发送的， 所述分流配置信息包括与所述目标 eNB 建立承载所需的配置信息和与所述 UE建立用户面连接所需的配置信息；
緩存模块 32, 用于根据所述分流配置信息进行分流配置， 并緩存所述 UE的用户面数据、 记录所述 UE的用户面数据的发送状态；
发送模块 33 , 用于在确认所述 UE完成分流配置后， 根据自身分流配置 后的配置信息及所述 UE的用户面数据的发送状态， 发送所述緩存模块 32緩 存的所述 UE的用户面数据。
可选地，接收模块 31还用于接收所述目标 eNB发送的 UE分流配置成功 指示； 相应地， 所述小节点还包括： 第一确认模块， 用于根据所述 UE分流 配置成功指示确认所述 UE完成分流配置。
可选地， 接收模块 31还用于接收所述 UE发送的上行同步消息， 发送模 块 33还用于向所述 UE下发时间提前量 TA和上行授权；
接收模块 31还用于接收所述 UE基于所述 TA和上行授权发送的分流配 置成功消息；
相应地， 所述小节点还包括： 第二确认模块， 用于根据所述分流配置成 功消息确认所述 UE完成分流配置。
进一步地， 緩存模块 32緩存的所述 UE的用户面数据包括緩存的上行用 户面数据和緩存的下行用户面数据；
发送模块 33具体用于在确认所述 UE完成分流配置后， 根据自身分流配 置后的配置信息及緩存模块 32记录的所述 UE的用户面数据的发送状态， 向 所述 UE发送緩存模块 32緩存的下行用户面数据，向所述目标 eNB发送所述 緩存模块緩存的上行用户面数据。
进一步地， 緩存模块 32緩存的下行用户面数据包括来自所述源 eNB的 下行用户面数据和来自所述目标 eNB的下行用户面数据；
发送模块 33具体用于在确认所述 UE完成分流配置后， 根据自身分流配 置后的配置信息及緩存模块 32记录的所述 UE的用户面数据的发送状态， 向 所述 UE发送所述来自所述源 eNB的下行用户面数据；在所述来自所述源 eNB 的下行用户面数据发送完成后， 根据自身分流配置后的配置信息及緩存模块 32记录的所述 UE的用户面数据的发送状态， 向所述 UE发送所述来自所述 目标 eNB的下行用户面数据。
本实施例的小节点，可以用于执行上述图 5所示方法实施例的技术方案， 其实现原理及技术效果类似， 此处不再贅述。
图 10为本发明基站实施例三的结构示意图。 如图 10所示， 本实施例 提供的基站可以包括： 发送器 41及接收器 42。
其中， 发送器 41用于向目标基站 eNB发送切换请求， 所述切换请求包 括当前服务小节点的上下文、 用户设备 UE的上下文及分流指示， 以使所述 目标 eNB将所述当前服务小节点作为所述 UE切换后的用户面服务节点、 将 所述目标 eNB作为所述 UE切换后的控制面服务节点；
接收器 42用于接收所述目标 eNB发送的切换请求确认， 所述切换请求 确认包括所述 UE的无线资源控制 RRC重配置信息和所述当前服务小节点的 分流配置信息， 所述切换请求确认是所述目标 eNB在判断所述 UE可以切换 且所述当前服务小节点可以作为所述 UE切换后的用户面服务节点、 所述目 标 eNB可以作为所述 UE切换后的控制面服务节点后发送的；
上述发送器 41 还用于向所述当前服务小节点发送所述当前服务小节点 的分流配置信息， 并向所述 UE发送所述 UE的 RRC重配置信息， 以使所述 当前服务小节点和所述 UE分别进行分流配置。
进一步地， 处理器还用于根据所述 UE的测量报告和 RRM信息，从预先 获得的小节点共享列表中确定一个 eNB为所述 UE切换的目标 eNB, 所述小 节点共享列表中包括共享所述当前服务小节点的多个 eNB的 ID; 或者，用于 根据所述 UE的所述测量艮告和所述 RRM信息确定一个 eNB作为所述 UE 切换的目标 eNB。
进一步地， 所述当前服务小节点的上下文包括： 所述当前服务小节点的 身份标识。
可选地， 所述当前服务小节点的上下文还包括：
所述当前服务小节点的使用频率、 系统信息及所述当前服务小节点支持 的安全算法。
本实施例的基站， 可以用于执行上述图 1或图 2所示方法实施例的技术 方案， 其实现原理及技术效果类似， 此处不再贅述。
图 11为本发明基站实施例四的结构示意图。 如图 11所示， 本实施例 提供的基站可以包括： 接收器 51 , 处理器 52及发送器 53。
其中， 接收器 51用于接收源基站 eNB发送的切换请求， 所述切换请求 包括当前服务小节点的上下文、 用户设备 UE的上下文及分流指示；
处理器 52用于根据所述切换请求， 判断所述 UE是否可以切换且所述当 前服务小节点可以作为所述 UE切换后的用户面服务节点、 所述目标 eNB可 以作为所述 UE切换后的控制面服务节点， 若是则生成所述 UE的 RRC重配 置信息和所述当前服务小节点的分流配置信息；
发送器 53用于将携带有所述 UE的 RRC重配置信息和所述当前服务小 节点的分流配置信息的切换请求确认发送给所述源 eNB, 以使所述源 eNB将 所述 UE的 RRC重配置信息发送给所述 UE、 将所述当前服务小节点的分流 配置信息发送给所述当前服务小节点。
进一步地，上述接收器 51还用于接收所述 UE在根据所述 UE的 RRC重 配置信息完成分流配置后发送的上行同步消息， 所述发送器 53还用于向 UE 下发时间提前量 TA和上行授权；上述接收器 51还用于接收 UE基于所述 TA 和上行授权发送的分流配置成功消息。
进一步地， 上述发送器 53还用于向所述当前服务小节点发送所述 UE分 流配置成功指示， 以使所述当前服务小节点确认所述 UE完成分流配置。
本实施例的基站， 可以用于执行上述图 3或图 4所示方法实施例的技术 方案， 其实现原理及技术效果类似， 此处不再贅述。
图 12为本发明小节点实施例二的结构示意图。 如图 12所示， 本实施例 提供的小节点可以包括： 接收器 61 , 处理器 62及发送器 63。
其中， 接收器 61用于接收源基站 eNB发送的分流配置信息， 所述分流 配置信息是所述源 eNB在接收到用户设备 UE切换的目标 eNB发送的切换请 求确认后发送的， 所述分流配置信息包括与所述目标 eNB建立承载所需的配 置信息和与所述 UE建立用户面连接所需的配置信息；
处理器 62用于根据所述分流配置信息进行分流配置， 并緩存所述 UE的 用户面数据、 记录所述 UE的用户面数据的发送状态；
发送器 63用于在确认所述 UE完成分流配置后， 根据自身分流配置后的 配置信息及所述 UE的用户面数据的发送状态， 发送所述处理器 62緩存的所 述 UE的用户面数据。
可选地，接收器 61还用于接收所述目标 eNB发送的 UE分流配置成功指 示； 相应地， 所述处理器 62还用于根据所述 UE分流配置成功指示确认所述 UE完成分流配置。
可选地，接收器 61还用于接收所述 UE发送的上行同步消息，发送器 63 还用于向所述 UE下发时间提前量 TA和上行授权；
接收器 61还用于接收所述 UE基于所述 TA和上行授权发送的分流配置 成功消息；
相应地， 处理器 62还用于根据所述分流配置成功消息确认所述 UE完成 分流配置。
进一步地， 处理器 62緩存的所述 UE的用户面数据包括緩存的上行用户 面数据和緩存的下行用户面数据；
发送器 63具体用于在确认所述 UE完成分流配置后， 根据所述小节点分 流配置后的配置信息及处理器 62记录的所述 UE的用户面数据的发送状态， 向所述 UE发送处理器 62緩存的下行用户面数据，向所述目标 eNB发送所述 緩存模块緩存的上行用户面数据。
进一步地， 处理器 62緩存的下行用户面数据包括来自所述源 eNB的下 行用户面数据和来自所述目标 eNB的下行用户面数据；
发送器 63具体用于在确认所述 UE完成分流配置后， 根据自身分流配置 后的配置信息及处理器 62记录的所述 UE的用户面数据的发送状态， 向所述 UE发送所述来自所述源 eNB的下行用户面数据； 在所述来自所述源 eNB的 下行用户面数据发送完成后，根据自身分流配置后的配置信息及处理器 62记 录的所述 UE的用户面数据的发送状态， 向所述 UE发送所述来自所述目标 eNB的下行用户面数据。
本实施例的小节点，可以用于执行上述图 5所示方法实施例的技术方案， 其实现原理及技术效果类似， 此处不再贅述。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步骤 可以通过程序指令相关的硬件来完成， 前述的程序可以存储于一计算机可读 取存储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述 的存储介质包括： ROM, RAM, 磁碟或者光盘等各种可以存储程序代码的介 最后应说明的是： 以上各实施例仅用以说明本发明的技术方案， 而非对 其限制； 尽管参照前述各实施例对本发明进行了详细的说明， 本领域的普通 技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改， 或者对其中部分或者全部技术特征进行等同替换； 而这些修改或者替换， 并 不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims

权 利 要 求 书
1、 一种小区切换方法， 其特征在于， 包括：
向目标基站 eNB发送切换请求， 所述切换请求包括当前服务小节点的上 下文、 用户设备 UE的上下文及分流指示， 以使所述目标 eNB将所述当前服 务小节点作为所述 UE切换后的用户面服务节点、 将所述目标 eNB作为所述 UE切换后的控制面服务节点；
接收所述目标 eNB发送的切换请求确认， 所述切换请求确认包括所述 UE的无线资源控制 RRC重配置信息和所述当前服务小节点的分流配置信息， 所述切换请求确认是所述目标 eNB在判断所述 UE可以切换且所述当前服务 小节点可以作为所述 UE切换后的用户面服务节点、 所述目标 eNB可以作为 所述 UE切换后的控制面服务节点后发送的；
向所述当前服务小节点发送所述当前服务小节点的分流配置信息， 并向 所述 UE发送所述 UE的 RRC重配置信息， 以使所述当前服务小节点和所述 UE分别进行分流配置。
2、 根据权利要求 1所述的方法， 其特征在于， 所述向目标基站 eNB发 送切换请求之前， 包括：
根据所述 UE的测量报告和无线资源管理 RRM信息，从预先获得的小节 点共享列表中确定一个 eNB为所述 UE切换的目标 eNB, 所述小节点共享列 表中包括共享所述当前服务小节点的多个 eNB的序列号 ID; 或者，
根据所述 UE的所述测量 ^艮告和所述 RRM信息确定一个 eNB作为所述
UE切换的目标 eNB。
3、 根据权利要求 1所述的方法， 其特征在于， 所述当前服务小节点的上 下文包括：
所述当前服务 d、节点的身份标识。
4、 根据权利要求 3所述的方法， 其特征在于， 所述当前服务小节点的上 下文还包括：
所述当前服务小节点的使用频率、 系统信息及所述当前服务小节点支持 的安全算法。
5、 一种小区切换方法， 其特征在于， 包括：
接收源基站 eNB发送的切换请求， 所述切换请求包括当前服务小节点的 上下文、 用户设备 UE的上下文及分流指示；
根据所述切换请求， 判断所述 UE是否可以切换且所述当前服务小节点 可以作为所述 UE切换后的用户面服务节点、 目标 eNB可以作为所述 UE切 换后的控制面服务节点， 若是则生成所述 UE的无线资源控制 RRC重配置信 息和所述当前服务小节点的分流配置信息；
将携带有所述 UE的 RRC重配置信息和所述当前服务小节点的分流配置 信息的切换请求确认发送给所述源 eNB,以使所述源 eNB将所述 UE的 RRC 重配置信息发送给所述 UE、将所述当前服务小节点的分流配置信息发送给所 述当前服务小节点。
6、 根据权利要求 5所述的方法， 其特征在于， 所述将携带有所述 UE的
RRC重配置信息和所述当前服务小节点的分流配置信息的切换请求确认发送 给所述源 eNB之后 , 还包括：
接收所述 UE在根据所述 UE的 RRC重配置信息完成分流配置后发送的 上行同步消息， 向所述 UE下发时间提前量 TA和上行授权；
接收所述 UE基于所述 TA和上行授权发送的分流配置成功消息。
7、 根据权利要求 6所述的方法， 其特征在于， 所述接收所述 UE基于所 述 TA和上行授权发送的分流配置成功消息之后还包括：
向所述当前服务小节点发送所述 UE分流配置成功指示， 以使所述当前 服务小节点确认所述 UE完成分流配置。
8、 一种小区切换方法， 其特征在于， 包括：
接收源基站 eNB发送的分流配置信息， 所述分流配置信息是所述源 eNB 在接收到用户设备 UE切换的目标 eNB发送的切换请求确认后发送的， 所述 分流配置信息包括与所述目标 eNB建立承载所需的配置信息和与所述 UE建 立用户面连接所需的配置信息；
根据所述分流配置信息进行分流配置， 并緩存所述 UE的用户面数据， 记录所述 UE的用户面数据的发送状态；
在确认所述 UE完成分流配置后， 根据自身分流配置后的配置信息及所 述 UE的用户面数据的发送状态， 发送緩存的所述 UE的用户面数据。
9、 根据权利要求 8所述的方法， 其特征在于， 所述确认所述 UE完成分 流配置， 包括： 接收所述目标 eNB发送的 UE分流配置成功指示；
根据所述 UE分流配置成功指示确认所述 UE完成分流配置。
10、 根据权利要求 8所述的方法， 其特征在于， 所述确认所述 UE完成 分流配置， 包括：
接收所述 UE发送的上行同步消息，向所述 UE下发时间提前量 TA和上 行授权；
接收所述 UE基于所述 TA和上行授权发送的分流配置成功消息； 根据所述分流配置成功消息确认所述 UE完成分流配置。
11、 根据权利要求 8〜10中任一项所述的方法， 其特征在于， 所述緩存的 所述 UE的用户面数据包括緩存的上行用户面数据和緩存的下行用户面数据； 所述根据自身分流配置后的配置信息及所述 UE的用户面数据的发送状 态， 发送緩存的所述 UE的用户面数据， 包括：
根据自身分流配置后的配置信息及所述 UE的用户面数据的发送状态， 向所述 UE发送所述緩存的下行用户面数据， 向所述目标 eNB发送所述緩存 的上行用户面数据。
12、 根据权利要求 11所述的方法， 其特征在于， 所述緩存的下行用户面 数据包括来自所述源 eNB的下行用户面数据和来自所述目标 eNB的下行用户 面数据；
所述根据自身分流配置后的配置信息及所述 UE的用户面数据的发送状 态， 向所述 UE发送所述緩存的下行用户面数据， 包括：
根据自身分流配置后的配置信息及所述 UE的用户面数据的发送状态， 向所述 UE发送所述来自所述源 eNB的下行用户面数据；
在所述来自所述源 eNB的下行用户面数据发送完成后， 根据自身分流配 置后的配置信息及所述 UE的用户面数据的发送状态，向所述 UE发送所述来 自所述目标 eNB的下行用户面数据。
13、 一种基站， 其特征在于， 包括：
发送模块， 用于向目标基站 eNB发送切换请求， 所述切换请求包括当前 服务小节点的上下文、用户设备 UE的上下文及分流指示，以使所述目标 eNB 将所述当前服务小节点作为所述 UE切换后的用户面服务节点、 将所述目标 eNB作为所述 UE切换后的控制面服务节点； 接收模块， 用于接收所述目标 eNB发送的切换请求确认， 所述切换请求 确认包括所述 UE的无线资源控制 RRC重配置信息和所述当前服务小节点的 分流配置信息， 所述切换请求确认是所述目标 eNB在判断所述 UE可以切换 且所述当前服务小节点可以作为所述 UE切换后的用户面服务节点、 所述目 标 eNB可以作为所述 UE切换后的控制面服务节点后发送的；
所述发送模块还用于向所述当前服务小节点发送所述当前服务小节点的 分流配置信息， 并向所述 UE发送所述 UE的 RRC重配置信息， 以使所述当 前服务小节点和所述 UE分别进行分流配置。
14、 根据权利要求 13所述的基站， 其特征在于， 还包括：
确定模块， 用于根据所述 UE的测量报告和无线资源管理 RRM信息，从 预先获得的小节点共享列表中确定一个 eNB为所述 UE切换的目标 eNB, 所 述小节点共享列表中包括共享所述当前服务小节点的多个 eNB的序列号 ID; 或者， 用于根据所述 UE的所述测量报告和所述 RRM信息确定一个 eNB作 为所述 UE切换的目标 eNB。
15、 根据权利要求 13所述的基站， 其特征在于， 所述当前服务小节点的 上下文包括：
所述当前服务 d、节点的身份标识。
16、 根据权利要求 15所述的基站， 其特征在于， 所述当前服务小节点的 上下文还包括：
所述当前服务小节点的使用频率、 系统信息及所述当前服务小节点支持 的安全算法。
17、 一种基站， 其特征在于， 包括：
接收模块， 用于接收源基站 eNB发送的切换请求， 所述切换请求包括当 前服务小节点的上下文、 用户设备 UE的上下文及分流指示；
判断模块， 用于根据所述切换请求， 判断所述 UE是否可以切换且所述 当前服务小节点可以作为所述 UE切换后的用户面服务节点、 目标 eNB可以 作为所述 UE切换后的控制面服务节点，若是则生成所述 UE的无线资源控制 RRC重配置信息和所述当前服务小节点的分流配置信息；
发送模块， 用于将携带有所述 UE的 RRC重配置信息和所述当前服务小 节点的分流配置信息的切换请求确认发送给所述源 eNB, 以使所述源 eNB将 所述 UE的 RRC重配置信息发送给所述 UE、 将所述当前服务小节点的分流 配置信息发送给所述当前服务小节点。
18、 根据权利要求 17所述的基站， 其特征在于， 所述接收模块还用于接 收所述 UE在根据所述 UE的 RRC重配置信息完成分流配置后发送的上行同 步消息； 所述发送模块还用于向所述 UE下发时间提前量 TA和上行授权； 所述接收模块还用于接收所述 UE基于所述 TA和上行授权发送的分流配 置成功消息。
19、 根据权利要求 18所述的基站， 其特征在于：
所述发送模块还用于向所述当前服务小节点发送所述 UE分流配置成功 指示， 以使所述当前服务小节点确认所述 UE完成分流配置。
20、 一种小节点， 其特征在于， 包括：
接收模块， 用于接收源基站 eNB发送的分流配置信息， 所述分流配置信 息是所述源 eNB在接收到用户设备 UE切换的目标 eNB发送的切换请求确认 后发送的， 所述分流配置信息包括与所述目标 eNB建立承载所需的配置信息 和与所述 UE建立用户面连接所需的配置信息；
緩存模块， 用于根据所述分流配置信息进行分流配置， 并緩存所述 UE 的用户面数据， 记录所述 UE的用户面数据的发送状态；
发送模块， 用于在确认所述 UE完成分流配置后， 根据自身分流配置后 的配置信息及所述 UE的用户面数据的发送状态， 发送所述緩存模块緩存的 所述 UE的用户面数据。
21、 根据权利要求 20所述的小节点， 其特征在于：
所述接收模块还用于接收所述目标 eNB发送的 UE分流配置成功指示； 还包括： 第一确认模块， 用于根据所述 UE分流配置成功指示确认所述 UE完成分流配置。
22、 根据权利要求 20所述的小节点， 其特征在于：
所述接收模块还用于接收所述 UE发送的上行同步消息， 所述发送模块 还用于向所述 UE下发时间提前量 TA和上行授权；
所述接收模块还用于接收所述 UE基于所述 TA和上行授权发送的分流配 置成功消息；
还包括： 第二确认模块， 用于根据所述分流配置成功消息确认所述 UE 完成分流配置。
23、 根据权利要求 20〜22任一项所述的小节点， 其特征在于， 所述緩存 模块緩存的所述 UE的用户面数据包括緩存的上行用户面数据和緩存的下行 用户面数据；
所述发送模块具体用于在确认所述 UE完成分流配置后， 根据自身分流 配置后的配置信息及所述緩存模块记录的所述 UE的用户面数据的发送状态， 向所述 UE发送所述緩存模块緩存的下行用户面数据， 向所述目标 eNB发送 所述緩存模块緩存的上行用户面数据。
24、 根据权利要求 23所述的小节点， 其特征在于， 所述緩存模块緩存的 下行用户面数据包括来自所述源 eNB的下行用户面数据和来自所述目标 eNB 的下行用户面数据；
所述发送模块具体用于在确认所述 UE完成分流配置后， 根据自身分流 配置后的配置信息及所述緩存模块记录的所述 UE的用户面数据的发送状态， 向所述 UE发送所述来自所述源 eNB的下行用户面数据； 在所述来自所述源 eNB的下行用户面数据发送完成后， 根据自身分流配置后的配置信息及所述 緩存模块记录的所述 UE的用户面数据的发送状态，向所述 UE发送所述来自 所述目标 eNB的下行用户面数据。
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US20160037398A1 (en) 2016-02-04
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