WO2017152757A1 - 一种小区切换方法、系统及相关设备 - Google Patents

一种小区切换方法、系统及相关设备 Download PDF

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Publication number
WO2017152757A1
WO2017152757A1 PCT/CN2017/074422 CN2017074422W WO2017152757A1 WO 2017152757 A1 WO2017152757 A1 WO 2017152757A1 CN 2017074422 W CN2017074422 W CN 2017074422W WO 2017152757 A1 WO2017152757 A1 WO 2017152757A1
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Prior art keywords
base station
context
target base
anchor
handover
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PCT/CN2017/074422
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English (en)
French (fr)
Inventor
王建中
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深圳市金立通信设备有限公司
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Publication of WO2017152757A1 publication Critical patent/WO2017152757A1/zh

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    • 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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]

Definitions

  • the present invention relates to the field of mobile communications technologies, and in particular, to a cell handover method, system, and related device.
  • RRC Radio Link Control
  • RLC Radio Link Control
  • MAC Media Access Control
  • PDCCH Physical Downlink Control Channel
  • the application server of each application also frequently pushes information to the UE through the LTE network, resulting in frequent paging procedures.
  • the RRC connection If the RRC connection is not established in the paging process, the RRC connection needs to be established first, and the entire paging process is generated. Paging signaling. It can be seen that frequently establishing an RRC connection and performing a paging procedure cause a severe signaling load on the LTE network.
  • the network side can configure a longer DRX period for the UE, so that the UE remains in the connected state for as long as possible, so as to reduce the frequency at which the UE establishes an RRC connection.
  • the UE in the connected state is During the mobile process, the cell handover process is frequently performed, which still causes severe signaling load on the LTE network.
  • the experimental data indicates that the UE establishes an RRC connection with the target base station for a long time, and it is difficult to meet the demand of the new service for low latency. .
  • Embodiments of the present invention provide a cell handover method, system, and related device, which can reduce a network.
  • a first aspect of the embodiments of the present invention provides a cell handover method, including:
  • the source base station unicasts the radio resource control RRC signaling including the discontinuous reception DRX period to the user terminal UE in the connected state, where the RRC signaling is used to indicate that the UE remains in the connected state according to the DRX cycle;
  • the source base station acquires the measurement report sent by the UE, and performs a handover decision according to the measurement report;
  • the source base station sends a handover request message to the target base station according to the handover decision, where the handover request message is used to indicate that the target base station acquires a context Context of the UE from an anchor Anchor connected to the target base station, and After determining that the UE is allowed to handover according to the Context of the UE, establishing an RRC connection with the UE.
  • a second aspect of the embodiments of the present invention provides a cell handover method, including:
  • the target base station receives a handover request message sent by the source base station according to the handover decision, where the handover decision is made by the source base station according to the measurement report sent by the UE;
  • the target base station acquires a Context of the UE from an Anchor connected to the target base station in response to the handover request message;
  • the target base station determines, by the target base station, that the UE is allowed to perform handover according to the Context of the UE, the target base station establishes an RRC connection with the UE.
  • a third aspect of the embodiments of the present invention provides a cell handover method, including:
  • the anchor receives an acquisition request of the Context of the UE that is sent by the target base station when receiving the handover request message sent by the source base station;
  • the Anchor Sending, by the Anchor, the Context of the UE to the target base station, where the Context of the UE is used to indicate that the target base station determines to allow the UE to switch according to the Context of the UE, and the The UE establishes an RRC connection.
  • a fourth aspect of the embodiments of the present invention provides a cell handover method, including:
  • RRC signaling including a DRX cycle unicast by the source base station, and maintaining the connected state according to the DRX cycle;
  • the base station performs a handover decision according to the measurement report, and sends a handover request message to the target base station according to the handover decision, where the handover request message is used to indicate that the target base station acquires the UE from an Anchor connected to the target base station.
  • Context ;
  • the UE establishes an RRC connection with the target base station in response to the RRC connection establishment indication sent by the target base station after determining that the UE is allowed to switch according to the Context of the UE.
  • a fifth aspect of the embodiments of the present invention provides a base station, including:
  • a sending unit configured to unicast RRC signaling including a DRX cycle to the UE in the connected state, where the RRC signaling is used to indicate that the UE remains in the connected state according to the DRX cycle;
  • An obtaining unit configured to acquire a measurement report sent by the UE
  • a decision unit configured to perform a handover decision according to the measurement report
  • a sending unit configured to send, according to the handover decision, a handover request message to the target base station, where the handover request message is used to indicate that the target base station acquires the Context of the UE from an Anchor connected to the target base station, and is based on The Context of the UE determines that the UE is allowed to switch, and establishes an RRC connection with the UE.
  • a sixth aspect of the embodiments of the present invention provides a base station, including:
  • a receiving unit configured to receive a handover request message sent by the source base station according to the handover decision, where the handover decision is made by the source base station according to the measurement report sent by the UE;
  • An acquiring unit configured to acquire a Context of the UE from an Anchor connected to the base station in response to the handover request message;
  • a determining unit configured to determine, according to the Context of the UE, whether to allow the UE to switch
  • a connecting unit configured to establish an RRC connection with the UE if the determining unit determines that the UE is allowed to switch.
  • a seventh aspect of the embodiments of the present invention provides an Anchor, including:
  • a receiving unit configured to receive an acquisition request of a Context of the UE that is sent by the target base station when receiving the handover request message sent by the source base station;
  • a sending unit configured to send a Context of the UE to the target base station in response to the acquiring request, where a Context of the UE is used to indicate that the target base station determines to allow the UE to switch according to a Context of the UE, and The UE establishes an RRC connection.
  • An eighth aspect of the embodiments of the present invention provides a UE, including:
  • a receiving unit configured to receive RRC signaling including a DRX cycle unicast by the source base station
  • control unit configured to remain in a connected state according to the DRX cycle
  • the receiving unit is further configured to receive a measurement configuration parameter that is sent by the source base station and used for cell handover.
  • a measuring unit configured to perform cell measurement according to the measurement configuration parameter, and generate a measurement report
  • a sending unit configured to send the measurement report to the source base station, where the measurement report is used to indicate that the source base station performs a handover decision according to the measurement report, and sends a handover request message to the target base station according to the handover decision,
  • the handover request message is used to indicate that the target base station acquires a Context of the UE from an Anchor connected to the target base station;
  • the receiving unit is further configured to receive an RRC connection establishment indication that is sent by the target base station after determining that the UE is allowed to switch according to the Context of the UE;
  • a connecting unit configured to establish an RRC connection with the target base station in response to the RRC connection establishment indication.
  • a ninth aspect of the embodiments of the present invention provides a cell handover system, including a UE, a source base station, a target base station, and an Anchor, where:
  • the source base station is configured to unicast RRC signaling including a DRX cycle to the UE in a connected state;
  • the UE is configured to receive the RRC signaling, and maintain the connected state according to the DRX cycle;
  • the source base station is further configured to send, to the UE in a connected state, a measurement configuration parameter used for cell handover;
  • the UE is further configured to receive the measurement configuration parameter, perform cell measurement according to the measurement configuration parameter, and generate a measurement report;
  • the UE is further configured to send the measurement report to the source base station;
  • the source base station is further configured to receive the measurement report, and perform a handover decision according to the measurement report;
  • the source base station is further configured to send a handover request message to the target base station according to the handover decision;
  • the target base station is configured to receive the handover request message, and obtain the Context of the UE from the Anchor connected to the target base station in response to the handover request message;
  • the target base station is further configured to send an RRC connection establishment indication to the UE after determining that the UE is allowed to switch according to the Context of the UE;
  • the UE is further configured to establish an RRC connection with the target base station in response to the RRC connection establishment indication.
  • the network side can configure a longer DRX period for the UE, so that the UE remains in the connected state for as long as possible, so as to reduce the frequency at which the UE establishes an RRC connection.
  • the UE in the connected state is in the process of moving. The cell handover process is frequently performed. Specifically, on the one hand, when switching between stations, the source base station and the target base station need to send signaling through the X2 interface to exchange the context of the UE (English: Context), and the target base station determines whether to receive the UE according to the Context of the UE, and The RRC connection is established.
  • the Context of the UE occupies a large signaling space, the Context of the UE carrying the UE in the signaling process will cause a serious signaling load on the LTE network.
  • the time of the X2 interface If the delay is large, it may take a long time for the UE to establish an RRC connection with the target base station, and it is difficult to meet the requirement of low latency for new services.
  • the source eNB unicasts the RRC signaling including the DRX period to the UE in the connected state, where the RRC signaling is used to indicate that the UE remains in the connected state according to the DRX period, and the source base station reports according to the UE.
  • the measurement report performs a handover decision, and sends a handover request message to the target base station according to the handover decision, where the handover request message is used to indicate that the target base station acquires the Context of the UE from an Anchor connected to the target base station, and according to the UE
  • the Context determines that the UE is allowed to switch, and establishes an RRC connection with the UE.
  • the target base station does not obtain the Context of the UE by using the signaling sent by the source base station, but acquires the Context of the UE from the Anchor that stores the UE Context, which can be reduced.
  • the signaling load of the network accelerates the switching speed of the cell.
  • FIG. 1 is a schematic diagram of a cell handover procedure according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a first embodiment of a cell handover method according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart diagram of a second embodiment of a cell handover method according to an embodiment of the present disclosure
  • FIG. 4 is a schematic flowchart diagram of a third embodiment of a cell handover method according to an embodiment of the present disclosure
  • FIG. 5 is a schematic flowchart diagram of a fourth embodiment of a cell handover method according to an embodiment of the present disclosure
  • FIG. 6 is a schematic diagram of a deployment of an Anchor according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of another deployment of an Anchor according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of an embodiment of a base station according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of an embodiment of a base station according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of an embodiment of an Anchor according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic structural diagram of a first embodiment of a UE according to an embodiment of the present disclosure.
  • FIG. 12 is a schematic structural diagram of a second embodiment of a UE according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic structural diagram of an embodiment of a cell switching system according to an embodiment of the present invention.
  • the UE described in the embodiments of the present invention may include a smart phone (such as an Android mobile phone, an iOS mobile phone, a Windows Phone mobile phone, etc.), a tablet computer, a palmtop computer, a notebook computer, and a mobile Internet device (English: Mobile Internet Device, abbreviation: MID).
  • a smart phone such as an Android mobile phone, an iOS mobile phone, a Windows Phone mobile phone, etc.
  • a tablet computer such as an Android mobile phone, an iOS mobile phone, a Windows Phone mobile phone, etc.
  • a palmtop computer such as a notebook computer
  • a mobile Internet device such as an Android mobile phone, an iOS mobile phone, a Windows Phone mobile phone, etc.
  • FIG. 1 is a schematic flowchart of a cell handover process according to an embodiment of the present invention.
  • the basic switching process is as follows:
  • the source eNB sends a Measurement Control message to the UE to control the cell measurement process of the UE in the connected state.
  • the UE reports Measurement Reports based on the measurement results.
  • the source base station makes a handover decision based on the measurement report.
  • the source base station After the source base station determines the handover, the source base station issues a Handover Request message to the target base station (ie, Target eNB), and notifies the target base station to prepare for handover.
  • the target base station ie, Target eNB
  • the target base station acquires the Context of the UE from the connected Anchor, and performs an admission decision according to the context of the UE.
  • the target base station prepares for handover and sends a Handover Request Acknowledge message to the source base station.
  • the source base station sends an RRC Connection Reconfiguration containing the mobility control information to the UE, indicating that the handover starts.
  • the UE performs a random access procedure of the target base station, and completes uplink synchronization between the UE and the target base station.
  • the UE When the UE successfully accesses the target cell, the UE sends an RRC Connection Reconfiguration Complete to the target base station, indicating that the handover procedure has ended, and the target base station can send data to the UE.
  • the target base station notifies the source base station that the handover is successful by sending a UE Context Release message, and triggers resource release of the source base station.
  • the source base station Upon receiving the UE Context Release message, the source base station releases the radio resource and control plane resources related to the UE Context, and the handover ends.
  • the Handover Request message does not carry the Context of the UE.
  • the target base station receives the handover request (ie, Handover Request) message sent by the source base station, the target base station directly obtains the Context of the UE from the Anchor connected to it, and performs subsequent operations.
  • the handover process because the Context of the UE occupies a large signaling space, does not carry the Context of the UE in the signaling but is obtained from the Anchor, which can greatly reduce the signaling load of the network.
  • the target base station acquires the Context of the UE from the Anchor, and can establish an RRC connection with the UE according to the Context of the UE when the UE is allowed to access, thereby speeding up the cell. Switching speed.
  • FIG. 2 is a schematic flowchart diagram of a first embodiment of a cell handover method according to an embodiment of the present invention.
  • the cell handover method described in this embodiment is mainly described from the source base station side, and includes the following steps:
  • the source base station unicasts the RRC signaling including the DRX period to the UE in the connected state, where the RRC signaling is used to indicate that the UE remains in the connected state according to the DRX cycle.
  • the UE has only two RRC states:
  • RRC_IDLE (idle state), this state includes the following features:
  • the eNB does not store the RRC context of the UE (Context)
  • UE has E-UTRAN-RRC connection
  • E-UTRAN knows which cell the UE belongs to
  • the network can receive and send data to and from the UE
  • i. UE can receive and send data to and from the network
  • Ii. UE detects control signaling for the shared data channel
  • the basic mechanism of DRX is to configure a DRX cycle for the UE in the connected state.
  • DRX The period consists of "On Duration" and "Opportunity for DRX".
  • the UE listens and receives the PDCCH, that is, the UE is in the active period; during the "Opportunity for DRX", the UE does not receive the data of the downlink channel. Save power, that is, the UE is in the dormant period.
  • the base station can configure the lengths of the activation period and the sleep period by using unicast RRC signaling.
  • the base station can control the UE to be in the connected state for a long time.
  • the source base station acquires a measurement report sent by the UE, and performs a handover decision according to the measurement report.
  • the source base station determines, according to the measurement report, whether there is a preset handover criterion (eg, a relative signal strength criterion, a relative signal strength criterion with a threshold specification, a relative signal strength criterion with a hysteresis margin, and a hysteresis margin or The cell of the relative signal strength criterion specified by the threshold, and whether it is necessary to perform inter-station handover, thereby making a handover decision.
  • a preset handover criterion eg, a relative signal strength criterion, a relative signal strength criterion with a threshold specification, a relative signal strength criterion with a hysteresis margin, and a hysteresis margin or The cell of the relative signal strength criterion specified by the threshold, and whether it is necessary to perform inter-station handover, thereby making a handover decision.
  • the source base station sends a handover request message to the target base station according to the handover decision, where the handover request message is used to indicate that the target base station acquires a context Context of the UE from an anchor Anchor connected to the target base station. And establishing an RRC connection with the UE after determining to allow the UE to switch according to the Context of the UE.
  • the Anchor in the embodiment of the present invention may be deployed in a centralized manner, that is, multiple base stations in an LTE network are simultaneously connected to one Anchor, and one Anchor serves multiple base stations at the same time, which can improve system efficiency, for example, a new wireless access network architecture C.
  • the baseband unit (English: Bandwidth Based Unit, abbreviation: BBU) pool in the RAN architecture; distributed deployment is also possible, that is, an anchor is configured separately for each base station, which can improve the robustness and stability of the system.
  • Anchor is mainly used to store the Context of the UE.
  • the Anchor can be used as part of the base station or as a separate network entity.
  • a fiber connection can be used between the anchor and the base station to increase the data transmission speed.
  • the base station can report the Context of the served UE to the connected Anchor.
  • the Anchor can also obtain the Context of the UE served by the corresponding base station from the core network side, for example, the mobility management entity (English: Mobile Management Entity, MME).
  • the centralized deployment of the Anchor stores the Context of some or all of the UEs served by the connected base stations.
  • the distributed deployment of the Anchor stores the connected eNB and the Context of some or all of the UEs served by the candidate base station (for example, the neighboring base station).
  • the Anchors can send their own stored UE Context through the connected base stations.
  • the Anchor connected to the candidate base station.
  • the Anchor may also update the Context of the UE, add a Context of the new UE, and may continue the duration of no service transmission (including the originating service and the receiving service) when the remaining storage space of the Anchor is small.
  • the Context of the UE exceeds the preset duration (for example, 1 day).
  • the source base station sends a handover request message to the target base station by using an X2 interface, where the handover request message is HANDOVER REQUEST signaling, and the HANDOVER REQUEST signaling does not carry the Context of the UE.
  • the target base station After receiving the HANDOVER REQUEST signaling, the target base station directly acquires the Context of the UE from its connected Anchor. If the target base station determines to allow the UE to switch according to the Context of the UE, the target base station may directly establish with the UE. RRC connection.
  • the target base station may send a Context acquisition request to the source base station, so that the source base station may further use the X2 interface to the target.
  • the eNB sends the Context of the UE to ensure that the target base station quickly switches to the existing handover procedure when the Context of the UE fails to be obtained from the Anchor.
  • the source base station unicasts the RRC signaling including the DRX period to the UE in the connected state, where the RRC signaling is used to indicate that the UE remains in the connected state according to the DRX period, and the source base station reports according to the UE.
  • the measurement report performs a handover decision, and sends a handover request message to the target base station according to the handover decision, where the handover request message is used to indicate that the target base station acquires the Context of the UE from an Anchor connected to the target base station, and according to the UE
  • the Context determines that the UE is allowed to switch, and establishes an RRC connection with the UE.
  • the target base station does not obtain the Context of the UE by using the signaling sent by the source base station, but acquires the Context of the UE from the Anchor that stores the UE Context, which can be reduced.
  • the signaling load of the network accelerates the switching speed of the cell.
  • FIG. 3 is a schematic flowchart diagram of a second embodiment of a cell handover method according to an embodiment of the present invention.
  • the cell handover method described in this embodiment is mainly described from the target base station side, and includes the following steps:
  • the target base station receives a handover request message sent by the source base station according to the handover decision, where the handover is performed.
  • the decision is made by the source base station based on the measurement report sent by the UE.
  • the target base station acquires a Context of the UE from an Anchor connected to the target base station in response to the handover request message.
  • the target base station establishes an RRC connection with the UE if the target base station determines, according to the Context of the UE, that the UE is allowed to perform handover.
  • the handover request message does not carry the Context of the UE.
  • the target base station obtains the Context of the UE directly from the connected Anchor in response to the handover request message. If the UE is allowed to perform handover according to the Context of the UE, the target base station may directly establish an RRC connection with the UE.
  • the target base station obtains the Context of the UE from the Anchor connected to the target base station in response to the handover request message sent by the source base station, and determines that the UE is allowed to switch according to the Context of the UE, and the UE Establishing an RRC connection, the target base station acquires the Context of the UE by using the signaling sent by the source base station, but obtains the Context of the UE from the Anchor that stores the UE Context, which can reduce the signaling load of the network and speed up the handover speed of the UE. .
  • FIG. 4 is a schematic flowchart diagram of a third embodiment of a cell handover method according to an embodiment of the present invention.
  • the cell handover method described in this embodiment is mainly described from the Anchor side, and includes the following steps:
  • the Anchor receives an acquisition request of the Context of the UE that is sent by the target base station when receiving the handover request message sent by the source base station.
  • the Anchor is connected to the source base station and the plurality of candidate base stations, and the target base station is one of the plurality of candidate base stations, and stores the Context of the source base station and some or all UEs served by the multiple candidate base stations. That is, the centralized deployment of the Anchor, multiple base stations are connected to the same Anchor, and the relationship between the base station and the Anchor is a many-to-one relationship.
  • the target base station is one of the plurality of candidate base stations, and each of the source base station and the candidate base station is connected to an anchor, and each base station connected Anchor stores the each base station and each of the base stations.
  • the Context of the neighboring base station service of the base station or the Context of all the UEs is an Anchor distributed deployment.
  • Each base station is connected to an Anchor.
  • the base station and the Anchor have a one-to-one relationship.
  • the Anchor can receive and store the Context of the UE reported by the connected base station, and can also obtain the Context of the UE served by the corresponding base station from the core network side, for example, the MME.
  • the Anchor sends the Context of the UE to the target base station in response to the acquiring request, where the Context of the UE is used to indicate that the target base station determines to allow the UE to switch according to the Context of the UE, and The UE establishes an RRC connection.
  • the handover request message does not carry the Context of the UE, and the target base station needs to obtain the Context of the UE from the connected Anchor, and then sends a request for acquiring the Context of the UE to the Anchor, where the acquisition request may carry the The identifier information of the UE, after receiving the acquisition request, the Anchor searches for the stored Context of the UE according to the identifier information of the UE, and sends the Context of the UE to the target base station, so that the target base station determines according to the Context of the UE. After the UE is allowed to switch, an RRC connection can be established with the UE.
  • the Anchor deletes, when the remaining storage space is less than or equal to a preset value, a Context of a UE that does not have a service transmission duration and reaches a preset duration.
  • the Anchor can delete the Context of the UE that has no service transmission (including the originating service and the receiving service) for a duration longer than the preset duration (for example, 1 day) when the remaining storage space of the Anchor is small.
  • the Anchor receives the UE Context acquisition request sent by the target base station, and sends the Context of the UE to the target base station after responding to the acquisition request, after the target base station determines to allow the UE to switch according to the Context of the UE,
  • the RRC connection can be established with the UE.
  • the Anchor can delete the Context of the UE that has not been transmitted for a preset duration. Since the Anchor stores the Context of the UE, the target base station does not need to obtain the Context of the UE through the signaling sent by the source base station, but directly obtains the Context from the Anchor, thereby reducing the signaling load of the network and speeding up the handover speed of the cell.
  • FIG. 5 is a schematic flowchart diagram of a fourth embodiment of a cell handover method according to an embodiment of the present invention.
  • the cell handover method described in this embodiment is mainly described from the UE side, and includes the following steps:
  • the UE receives the RRC signaling including the DRX cycle unicast by the source base station, and maintains the connected state according to the DRX cycle.
  • the DRX period is composed of "On Duration” and "Opportunity for DRX".
  • the UE listens and receives the PDCCH, that is, the UE is in the active period; during the "Opportunity for DRX", the UE does not receive the downlink channel.
  • Data to save power that is, the UE is in a dormant period.
  • the UE may be in a connected state for a long time.
  • the UE receives measurement configuration parameters for cell handover sent by the source base station, performs cell measurement according to the measurement configuration parameter, and generates a measurement report.
  • the UE receives the measurement configuration parameter sent by the source base station, and performs cell measurement according to the measurement configuration parameter, thereby generating a measurement report.
  • the UE sends the measurement report to the source base station, where the measurement report is used to instruct the source base station to perform a handover decision according to the measurement report, and send a handover request message to the target base station according to the handover decision.
  • the handover request message is used to indicate that the target base station acquires the Context of the UE from an Anchor connected to the target base station.
  • the UE reports the measurement report to the source base station, and the source base station makes a handover decision according to the measurement report, and sends a handover request message to the target base station when determining to perform inter-station handover, and then the target base station is connected to the Anchor. Get the Context of the UE.
  • the UE in response to the target base station determining an RRC connection setup indication that is sent after the UE is allowed to be handed over according to the Context of the UE, establish an RRC connection with the target base station.
  • the target base station may send an RRC connection setup indication to the UE after determining that the UE is allowed to switch according to the Context of the UE, and the UE may establish an RRC connection with the target base station after receiving the RRC connection setup indication.
  • the UE receives the RRC signaling including the DRX cycle unicast by the source base station, and maintains the connected state according to the DRX cycle for a long time, and the UE performs cell measurement according to the measurement configuration parameter sent by the source base station, and generates The measurement report is reported to the source base station, so that the source base station performs a handover decision according to the measurement report, and sends a handover request message to the target base station when the inter-station handover is performed, so that the target base station obtains from the connected Anchor.
  • the Context of the UE and after determining that the UE is allowed to switch according to the Context of the UE, sending an RRC connection setup indication to the UE, so that the UE can establish an RRC connection with the target base station, and the source base station is not sent to the target base station.
  • the signaling carries the Context of the UE, but the target base station acquires the Context of the UE from the Anchor that stores the UE Context, thereby reducing the signaling load of the network and speeding up the handover speed of the cell.
  • the Anchor is deployed in a centralized manner, and is applicable to a small-station dense deployment scenario.
  • the base station #1 to the base station #5 are connected to the same Anchor, and the Anchor storage base station #1 to base station #5 serve.
  • the UE is powered on and enters the idle state.
  • the video service is generated.
  • the UE establishes an RRC connection with the base station #2, and the base station #2 can report the Context of the UE to the Context.
  • the UE switches from the idle state to the connected state, and performs a cell handover procedure.
  • the UE When the UE moves to the location #3, the video service ends, the UE continues to maintain the connected state, and when the mobile station moves to the location #4, if the UE
  • the measurement report indicates that the signal strength of the base station #3 (ie, the target base station) is stronger than the signal strength of the base station #2 (ie, the source base station), and the base station #2 transmits a handover request message to the base station #3, and the base station #3 acquires the information from the Anchor.
  • the Context of the UE if the base station #3 allows the UE to switch, the RRC connection with the UE can be directly established, thereby quickly completing the cell handover and reducing the signaling load of the network.
  • the Anchor adopts a distributed deployment, which is applicable to a macro base station deployment scenario, and the base station #1 to the base station #7 are respectively connected to an Anchor, and each Anchor stores a Context of a UE served by the base station connected thereto.
  • the Context of the UE served by the neighboring base station of the base station connected thereto, and the Anchor connected to the base station #2 stores the neighboring base station of the base station #2 in addition to the Context of the UE served by the base station #2 (ie, the base station #1, The Context of the UE served by the base station #3, the base station #4, the base station #5, the base station #6, and the base station #7, the location #1, the UE is powered on and enters the idle state, and the UE moves to the location #2 when there is a video service.
  • the UE establishes an RRC connection with the base station #2, and the base station #2 can report the Context of the UE to the Anchor connected to the base station #2, and the Anchor connected to the base station #2 can send the Context of the UE to the base station #2.
  • the neighbor connected to the base station of the base station #2 is stored, the UE is switched from the idle state to the connected state, and the cell handover procedure is performed.
  • the UE moves to the location #3, the video service ends, and the UE continues to maintain the connected state and moves.
  • the base station # 3 i.e., target base station
  • (i.e., source base station) signal strength of base station # 2 the base station 2 # 3 transmits a handover request message to the base station #, # 3 from the base station
  • the Context of the UE is obtained in the connected Anchor. If the UE #3 allows the UE to switch, the RRC connection with the UE can be directly established, thereby quickly completing the cell handover and reducing the signaling load of the network.
  • FIG. 8 is a schematic structural diagram of an embodiment of a base station according to an embodiment of the present invention.
  • the base station described in this embodiment includes:
  • the sending unit 801 is configured to unicast the RRC signaling including the DRX cycle to the UE in the connected state, where the RRC signaling is used to indicate that the UE remains in the connected state according to the DRX cycle.
  • the obtaining unit 802 is configured to acquire a measurement report sent by the UE.
  • the determining unit 803 is configured to perform a handover decision according to the measurement report.
  • the sending unit 801 is further configured to send, according to the handover decision, a handover request message to the target base station, where the handover request message is used to indicate that the target base station acquires the Context of the UE from an Anchor connected to the target base station. And establishing an RRC connection with the UE after determining to allow the UE to switch according to the Context of the UE.
  • the Anchor is connected to the source base station and multiple candidate base stations, and the target base station is one of the multiple candidate base stations, and the Anchor stores the source base station and the multiple candidate to be selected.
  • the target base station is one of a plurality of candidate base stations, and each of the source base station and the candidate base station is connected to an Anchor, and each Anchor connected to each base station stores the foregoing.
  • the specific manner in which the sending unit 801 sends a handover request message to the target base station according to the handover decision is:
  • a handover request message is sent to the target base station through the X2 interface.
  • the source base station unicasts the RRC signaling including the DRX period to the UE in the connected state, where the RRC signaling is used to indicate that the UE remains in the connected state according to the DRX cycle, and the source base The station performs a handover decision according to the measurement report reported by the UE, and sends a handover request message to the target base station according to the handover decision, where the handover request message is used to indicate that the target base station acquires the Context of the UE from an Anchor connected to the target base station.
  • the target base station after determining that the UE is allowed to switch according to the Context of the UE, establishing an RRC connection with the UE, the target base station not acquiring the Context of the UE by using the signaling sent by the source base station, but acquiring the UE from the Anchor storing the UE Context.
  • the Context can reduce the signaling load of the network and speed up the switching speed of the cell.
  • FIG. 9 is a schematic structural diagram of an embodiment of a base station according to an embodiment of the present invention.
  • the base station described in this embodiment includes:
  • the receiving unit 901 is configured to receive a handover request message that is sent by the source base station according to the handover decision, where the handover decision is made by the source base station according to the measurement report sent by the UE.
  • the obtaining unit 902 is configured to obtain, according to the handover request message, a Context of the UE from an Anchor connected to the base station.
  • the determining unit 903 is configured to determine, according to the Context of the UE, whether to allow the UE to switch.
  • the connecting unit 904 is configured to establish an RRC connection with the UE if the determining unit determines that the UE is allowed to handover.
  • the Anchor is connected to the source base station and multiple candidate base stations, and the target base station is one of the multiple candidate base stations, and the Anchor stores the source base station and the multiple candidate to be selected.
  • the target base station is one of a plurality of candidate base stations, and each of the source base station and the candidate base station is connected to an Anchor, and each Anchor connected to each base station stores the foregoing.
  • the target base station obtains the Context of the UE from the Anchor connected to the target base station in response to the handover request message sent by the source base station, and determines that the UE is allowed to switch according to the Context of the UE, and the UE Establishing an RRC connection, the target base station acquires the Context of the UE by using the signaling sent by the source base station, but acquires the information from the Anchor that stores the UE Context.
  • the Context of the UE can reduce the signaling load of the network and speed up the switching speed of the cell.
  • FIG. 10 is a schematic structural diagram of an embodiment of an Anchor according to an embodiment of the present invention.
  • the Anchor described in this embodiment includes:
  • the receiving unit 1001 is configured to receive an acquisition request of the Context of the UE that is sent by the target base station when receiving the handover request message sent by the source base station.
  • the sending unit 1002 is configured to send, according to the acquiring request, the Context of the UE to the target base station, where the Context of the UE is used to indicate that the target base station determines to allow the UE to switch according to the Context of the UE, Establishing an RRC connection with the UE.
  • the Context update unit 1003 of the UE is configured to delete, when the remaining storage space is less than or equal to the preset value, the Context of the UE that has not been extended by the service transmission and reaches a preset duration.
  • the Anchor is connected to the source base station and multiple candidate base stations, and the target base station is one of the multiple candidate base stations, and the Anchor stores the source base station and the multiple candidate to be selected.
  • the target base station is one of a plurality of candidate base stations, and each of the source base station and the candidate base station is connected to an Anchor, and each Anchor connected to each base station stores the foregoing.
  • the Anchor receives the UE Context acquisition request sent by the target base station, and sends the Context of the UE to the target base station after responding to the acquisition request, after the target base station determines to allow the UE to switch according to the Context of the UE,
  • the RRC connection can be established with the UE.
  • the Anchor can delete the Context of the UE that has not been transmitted for a preset duration. Since the Anchor stores the Context of the UE, the target base station does not need to obtain the Context of the UE through the signaling sent by the source base station, but directly obtains the Context from the Anchor, thereby reducing the signaling load of the network and speeding up the handover speed of the cell.
  • FIG. 11 is a schematic structural diagram of a first embodiment of a UE according to an embodiment of the present invention.
  • the UE described in this embodiment includes:
  • the receiving unit 1101 is configured to receive RRC signaling including a DRX cycle unicast by the source base station.
  • the control unit 1102 is configured to maintain the connected state according to the DRX cycle.
  • the receiving unit 1101 is further configured to receive a measurement configuration parameter that is sent by the source base station and used for cell handover.
  • the measuring unit 1103 is configured to perform cell measurement according to the measurement configuration parameter, and generate a measurement report.
  • the sending unit 1104 is configured to send the measurement report to the source base station, where the measurement report is used to instruct the source base station to perform a handover decision according to the measurement report, and send a handover request message to the target base station according to the handover decision.
  • the handover request message is used to indicate that the target base station acquires the Context of the UE from an Anchor connected to the target base station.
  • the receiving unit 1101 is further configured to receive an RRC connection establishment indication that is sent by the target base station after determining that the UE is allowed to switch according to the Context of the UE.
  • the connecting unit 1105 is configured to establish an RRC connection with the target base station in response to the RRC connection establishment indication.
  • the UE receives the RRC signaling including the DRX cycle unicast by the source base station, and maintains the connected state according to the DRX cycle for a long time, and the UE performs cell measurement according to the measurement configuration parameter sent by the source base station, and generates The measurement report is reported to the source base station, so that the source base station performs a handover decision according to the measurement report, and sends a handover request message to the target base station when the inter-station handover is performed, so that the target base station obtains from the connected Anchor.
  • the Context of the UE and after determining that the UE is allowed to switch according to the Context of the UE, sending an RRC connection setup indication to the UE, so that the UE can establish an RRC connection with the target base station, and the source base station is not sent to the target base station.
  • the eNB is configured to carry the Context of the UE, but the target base station acquires the Context of the UE from the Anchor that stores the UE Context, thereby reducing the signaling load of the network and speeding up the handover speed of the cell.
  • FIG. 12 is a schematic structural diagram of a second embodiment of a UE according to an embodiment of the present invention.
  • the UE described in this embodiment includes: at least one input device 1201; at least one output device 1202; at least one processor 1203, such as a CPU; and a memory 1204, the input device 1201, the output device 1202, the processor 1203, and the memory 1204 is connected by bus 1205.
  • the input device 1201 may specifically be a radio frequency module, configured to receive a signal sent by the base station.
  • the output device 1202 may be specifically a radio frequency module, configured to send a signal to the base station.
  • the above memory 1204 may be a high speed RAM memory or a non-volatile memory such as a disk memory.
  • the above memory 1204 is configured to store a set of program codes, and the input device 1201, the output device 1202, and the processor 1203 are used to call the program code stored in the memory 1204, and perform the following operations:
  • the input device 1201 is configured to receive RRC signaling including a DRX cycle unicast by the source base station.
  • the processor 1203 is configured to maintain the connected state according to the DRX cycle.
  • the input device 1201 is further configured to receive a measurement configuration parameter used by the source base station for cell handover.
  • the processor 1203 is further configured to perform cell measurement according to the measurement configuration parameter, and generate a measurement report.
  • the output device 1202 is configured to send the measurement report to the source base station, where the measurement report is used to instruct the source base station to perform a handover decision according to the measurement report, and send a handover request to the target base station according to the handover decision.
  • the message, the handover request message is used to indicate that the target base station acquires the Context of the UE from an Anchor connected to the target base station.
  • the processor 1203 is further configured to establish an RRC connection with the target base station in response to the RRC connection establishment indication sent by the target base station after determining that the UE is allowed to be handed over according to the Context of the UE.
  • the input device 1201, the output device 1202, and the processor 1203, which are described in the embodiments of the present invention, may be implemented in the fourth embodiment of the cell switching method provided by the embodiment of the present invention.
  • An implementation manner of the UE described in the first embodiment of the UE is provided in the embodiment of the present invention, and details are not described herein again.
  • the UE receives the RRC signaling including the DRX cycle unicast by the source base station, and The UE is configured to perform the cell measurement according to the measurement configuration parameter sent by the source base station, and generates a measurement report, and reports the measurement report to the source base station, so that the source base station performs the measurement report according to the measurement report.
  • the handover request is sent to the target base station when the inter-station handover is performed, so that the target base station acquires the Context of the UE from the connected Anchor, and sends the UE to the UE after determining that the UE is allowed to switch according to the Context of the UE.
  • the RRC connection establishment indication so that the UE can establish an RRC connection with the target base station, where the source base station does not carry the Context of the UE in the signaling sent to the target base station, but the target base station acquires from the Anchor that stores the UE Context.
  • the Context of the UE can reduce the signaling load of the network and speed up the handover speed of the cell.
  • FIG. 13 is a schematic structural diagram of an embodiment of a cell switching system according to an embodiment of the present invention.
  • the cell handover system described in this embodiment includes a UE 1301, a source base station 1302, a target base station 1303, and an Anchor 1304, where:
  • the source base station 1302 is configured to unicast RRC signaling including a DRX cycle to the UE in a connected state.
  • the UE 1301 is configured to receive the RRC signaling, and maintain the connected state according to the DRX cycle.
  • the source base station 1302 is further configured to send measurement configuration parameters for cell handover to the UE in a connected state.
  • the UE 1301 is further configured to receive the measurement configuration parameter, perform cell measurement according to the measurement configuration parameter, and generate a measurement report.
  • the UE 1301 is further configured to send the measurement report to the source base station.
  • the source base station 1302 is further configured to receive the measurement report, and perform a handover decision according to the measurement report.
  • the source base station 1302 is further configured to send a handover request message to the target base station according to the handover decision.
  • the target base station 1303 is configured to receive the handover request message, and obtain the Context of the UE from the Anchor 1304 connected to the target base station in response to the handover request message.
  • the target base station 1303 is further configured to: determine to allow the UE according to a Context of the UE. After the handover, an RRC connection establishment indication is sent to the UE.
  • the UE 1301 is further configured to establish an RRC connection with the target base station in response to the RRC connection establishment indication.
  • the source base station unicasts the RRC signaling including the DRX cycle to the UE in the connected state, and the UE 110 maintains the connected state according to the DRX cycle for a long time; the source base station sends the UE to the UE for cell handover.
  • the UE performs cell measurement according to the measurement configuration parameter, generates a measurement report, and sends the measurement report to the source base station, where the source base station performs a handover decision according to the measurement report, and sends the target node to the target base station when performing inter-station handover a handover request message, the target base station acquires the Context of the UE from the connected Anchor in response to the handover request message, and establishes an RRC connection with the UE after determining that the UE is allowed to handover according to the Context of the UE, and the target base station does not pass the source
  • the signaling sent by the base station acquires the Context of the UE, but acquires the Context of the UE from the Anchor that stores the UE Context, which can reduce the signaling load of the network and speed up the handover speed of the cell.
  • the units in all the embodiments of the present invention may be implemented by a general-purpose integrated circuit, such as a CPU (Central Processing Unit), or by an ASIC (Application Specific Integrated Circuit).
  • a general-purpose integrated circuit such as a CPU (Central Processing Unit), or by an ASIC (Application Specific Integrated Circuit).
  • the units in the terminal in the embodiment of the present invention may be combined, divided, and deleted according to actual needs.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

Abstract

本发明实施例提供了一种小区切换方法、系统及相关设备，该方法包括：源基站向处于连接态的UE单播包括DRX周期的RRC信令，该RRC信令用于指示该UE根据该DRX周期保持在该连接态；该源基站根据该UE上报的测量报告进行切换决策，并根据该切换决策向目标基站发送切换请求消息，该切换请求消息用于指示该目标基站从与该目标基站连接的Anchor处获取该UE的Context，并在根据该UE的Context确定允许该UE切换后，与该UE建立RRC连接，目标基站不通过源基站发送的信令获取该UE的Context，而是从存储有UE Context的Anchor处获取该UE的Context。通过本发明实施例可以降低网络的信令负荷，并加快小区的切换速度。

Description

一种小区切换方法、系统及相关设备 技术领域
本发明涉及移动通信技术领域，具体涉及一种小区切换方法、系统及相关设备。
背景技术
随着移动通信技术的快速发展，长期演进(英文：Long Term Evolution，缩写：LTE)网络得到了快速部署和普及，LTE用户数量急剧增长，以高清晰多媒体流业务为代表的新兴业务快速涌现，用户终端(英文：User Equipment，缩写：UE)上安装的应用也越来越多，这些应用会频繁地触发UE通过与LTE网络建立无线资源控制(英文：Radio Resource Control，缩写：RRC)连接从而进一步与应用服务器建立连接以进行数据交换，而RRC连接建立的过程，也就是UE从空闲(英文：IDLE)态进入连接(英文：CONNECTED)态的过程，这一过程会产生大量的信令，包括RRC、无线链路控制(英文：Radio Link Control，缩写：RLC)、介质访问控制(英文：Media Access Control，缩写：MAC)、物理下行控制信道(英文：Physical Downlink Control Channel，缩写：PDCCH)等信令。此外，各个应用的应用服务器也会频繁地通过LTE网络向UE推送信息，导致频繁的寻呼流程，寻呼流程中如果RRC连接未建立则需要先建立RRC连接，整个寻呼过程会产生较多的寻呼信令。可见，频繁地建立RRC连接以及进行寻呼流程会给LTE网络造成严重的信令负荷。
当前出现的一种解决方案中，网络侧可以为UE配置较长的DRX周期，使UE尽可能长时间地保持在连接态，以降低UE建立RRC连接的频率，然而，处于连接态的UE在移动过程中会频繁地进行小区切换流程，仍然会给LTE网络造成严重的信令负荷，同时实验数据表明UE与目标基站建立RRC连接的耗时较长，难以满足新业务对低时延的需求。
发明内容
本发明实施例提供了一种小区切换方法、系统及相关设备，可以降低网络 的信令负荷，并加快小区的切换速度。
本发明实施例第一方面提供了一种小区切换方法，包括：
源基站向处于连接态的用户终端UE单播包括非连续接收DRX周期的无线资源控制RRC信令，所述RRC信令用于指示所述UE根据所述DRX周期保持在所述连接态；
源基站获取所述UE发送的测量报告，并根据所述测量报告进行切换决策；
所述源基站根据所述切换决策向目标基站发送切换请求消息，所述切换请求消息用于指示所述目标基站从与所述目标基站连接的锚点Anchor处获取所述UE的上下文Context，并在根据所述UE的Context确定允许所述UE切换后，与所述UE建立RRC连接。
本发明实施例第二方面提供了一种小区切换方法，包括：
目标基站接收源基站根据切换决策发送的切换请求消息，所述切换决策由所述源基站根据UE发送的测量报告做出；
所述目标基站响应所述切换请求消息从与所述目标基站连接的Anchor处获取所述UE的Context；
在所述目标基站根据所述UE的Context确定允许所述UE切换的情况下，所述目标基站与所述UE建立RRC连接。
本发明实施例第三方面提供了一种小区切换方法，包括：
Anchor接收目标基站在接收到源基站发送的切换请求消息时发送的UE的Context的获取请求；
所述Anchor响应所述获取请求向所述目标基站发送所述UE的Context，所述UE的Context用于指示所述目标基站在根据所述UE的Context确定允许所述UE切换后，与所述UE建立RRC连接。
本发明实施例第四方面提供了一种小区切换方法，包括：
UE接收源基站单播的包括DRX周期的RRC信令，并根据所述DRX周期保持在连接态；
所述UE接收所述源基站发送的用于小区切换的测量配置参数，根据所述测量配置参数进行小区测量，并生成测量报告；
所述UE向所述源基站发送所述测量报告，所述测量报告用于指示所述源 基站根据所述测量报告进行切换决策，并根据所述切换决策向目标基站发送切换请求消息，所述切换请求消息用于指示所述目标基站从与所述目标基站连接的Anchor处获取所述UE的Context；
所述UE响应所述目标基站在根据所述UE的Context确定允许所述UE切换后发送的RRC连接建立指示，与所述目标基站建立RRC连接。
本发明实施例第五方面提供了一种基站，包括：
发送单元，用于向处于连接态的UE单播包括DRX周期的RRC信令，所述RRC信令用于指示所述UE根据所述DRX周期保持在所述连接态；
获取单元，用于获取所述UE发送的测量报告；
决策单元，用于根据所述测量报告进行切换决策；
发送单元，用于根据所述切换决策向目标基站发送切换请求消息，所述切换请求消息用于指示所述目标基站从与所述目标基站连接的Anchor处获取所述UE的Context，并在根据所述UE的Context确定允许所述UE切换后，与所述UE建立RRC连接。
本发明实施例第六方面提供了一种基站，包括：
接收单元，用于接收源基站根据切换决策发送的切换请求消息，所述切换决策由所述源基站根据UE发送的测量报告做出；
获取单元，用于响应所述切换请求消息从与所述基站连接的Anchor处获取所述UE的Context；
确定单元，用于根据所述UE的Context确定是否允许所述UE切换；
连接单元，用于在所述确定单元确定出允许所述UE切换的情况下，与所述UE建立RRC连接。
本发明实施例第七方面提供了一种Anchor，包括：
接收单元，用于接收目标基站在接收到源基站发送的切换请求消息时发送的UE的Context的获取请求；
发送单元，用于响应所述获取请求向所述目标基站发送所述UE的Context，所述UE的Context用于指示所述目标基站在根据所述UE的Context确定允许所述UE切换后，与所述UE建立RRC连接。
本发明实施例第八方面提供了一种UE，包括：
接收单元，用于接收源基站单播的包括DRX周期的RRC信令；
控制单元，用于根据所述DRX周期保持在连接态；
所述接收单元，还用于接收所述源基站发送的用于小区切换的测量配置参数；
测量单元，用于根据所述测量配置参数进行小区测量，并生成测量报告；
发送单元，用于向所述源基站发送所述测量报告，所述测量报告用于指示所述源基站根据所述测量报告进行切换决策，并根据所述切换决策向目标基站发送切换请求消息，所述切换请求消息用于指示所述目标基站从与所述目标基站连接的Anchor处获取所述UE的Context；
所述接收单元，还用于接收所述目标基站在根据所述UE的Context确定允许所述UE切换后发送的RRC连接建立指示；
连接单元，用于响应所述RRC连接建立指示，与所述目标基站建立RRC连接。
本发明实施例第九方面提供了一种小区切换系统，包括UE、源基站、目标基站和Anchor，其中：
所述源基站，用于向处于连接态的所述UE单播包括DRX周期的RRC信令；
所述UE，用于接收所述RRC信令，并根据所述DRX周期保持在所述连接态；
所述源基站，还用于向处于连接态的所述UE发送用于小区切换的测量配置参数；
所述UE，还用于接收所述测量配置参数，根据所述测量配置参数进行小区测量，并生成测量报告；
所述UE，还用于向所述源基站发送所述测量报告；
所述源基站，还用于接收所述测量报告，并根据所述测量报告进行切换决策；
所述源基站，还用于根据所述切换决策向目标基站发送切换请求消息；
所述目标基站，用于接收所述切换请求消息，并响应所述切换请求消息从与所述目标基站连接的所述Anchor处获取所述UE的Context；
所述目标基站，还用于在根据所述UE的Context确定允许所述UE切换后向所述UE发送RRC连接建立指示；
所述UE，还用于响应所述RRC连接建立指示，与所述目标基站建立RRC连接。
当前出现的解决方案中，网络侧可以为UE配置较长的DRX周期，使UE尽可能长时间地保持在连接态，以降低UE建立RRC连接的频率，然而，处于连接态的UE在移动过程中会频繁地进行小区切换流程。具体的，一方面，在站间切换时，源基站与目标基站需要通过X2接口发送信令来交互UE的上下文(英文：Context)，目标基站根据UE的Context来决定是否接收该UE，并与之建立RRC连接，由于UE的Context会占用较大的信令空间，每次切换流程都在信令中携带UE的Context会给LTE网络造成严重的信令负荷；另一方面，X2接口的时延较大，会造成UE与目标基站建立RRC连接的耗时较长，难以满足新业务对低时延的需求。
本发明实施例中，源基站向处于连接态的UE单播包括DRX周期的RRC信令，该RRC信令用于指示该UE根据该DRX周期保持在该连接态，该源基站根据该UE上报的测量报告进行切换决策，并根据该切换决策向目标基站发送切换请求消息，该切换请求消息用于指示该目标基站从与该目标基站连接的Anchor处获取该UE的Context，并在根据该UE的Context确定允许该UE切换后，与该UE建立RRC连接，目标基站不通过源基站发送的信令获取该UE的Context，而是从存储有UE Context的Anchor处获取该UE的Context，可以降低网络的信令负荷，并加快小区的切换速度。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅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是本发明实施例提供的一种小区切换流程示意图；
图2是本发明实施例提供的一种小区切换方法的第一实施例流程示意图；
图3是本发明实施例提供的一种小区切换方法的第二实施例流程示意图；
图4是本发明实施例提供的一种小区切换方法的第三实施例流程示意图；
图5是本发明实施例提供的一种小区切换方法的第四实施例流程示意图；
图6是本发明实施例提供的Anchor的一种部署示意图；
图7是本发明实施例提供的Anchor的另一种部署示意图；
图8是本发明实施例提供的一种基站的一实施例结构示意图；
图9是本发明实施例提供的一种基站的一实施例结构示意图；
图10是本发明实施例提供的一种Anchor的一实施例结构示意图；
图11是本发明实施例提供的一种UE的第一实施例结构示意图；
图12是本发明实施例提供的一种UE的第二实施例结构示意图；
图13是本发明实施例提供的一种小区切换系统的一实施例结构示意图。
具体实施方式
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，所描述的实施例仅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。
本发明实施例所描述的UE可以包括智能手机(如Android手机、iOS手机、Windows Phone手机等)、平板电脑、掌上电脑、笔记本电脑、移动互联网设备(英文：Mobile Internet Device，缩写：MID)、穿戴式设备和机器类型通信(英文：Machine Type Communication，缩写：MTC)终端等，上述UE仅是举例，而非穷举，包含但不限于上述UE。
请参阅图1，为本发明实施例提供的一种小区切换流程示意图。基本的切换流程如下：
a)在无线承载建立时，源基站(即Source eNB)下发Measurement Control消息至UE，用于控制连接态的UE的小区测量过程。
b)UE根据测量结果上报Measurement Reports。
c)源基站根据测量报告进行切换决策。
d)当源基站决定切换后，源基站发布Handover Request消息给目标基站(即Target eNB)，通知目标基站准备切换。
e)目标基站从连接的Anchor处获取UE的Context，并根据UE的Context进行准入判决。
f)若判断为资源准入，则目标基站准备切换并对源基站发送Handover Request Acknowledge消息。
g)源基站下发包含mobility control Information的RRC Connection Reconfiguration至UE，指示切换开始。
h)UE进行目标基站的随机接入过程，完成UE与目标基站之间的上行同步。
i)当UE成功接入目标小区时，UE发送RRC Connection Reconfiguration Complete给目标基站，指示切换流程已经结束，目标基站可以发送数据给UE。
j)执行下行路径数据转换过程。
k)目标基站通过发送UE Context Release消息通知源基站切换成功，并触发源基站的资源释放。
l)收到UE Context Release消息，源基站释放UE Context相关的无线资源与控制面资源，至此切换结束。
可以看出，Handover Request消息中不携带UE的Context，目标基站在收到源基站发送的切换请求(即Handover Request)消息时，目标基站直接从与其连接的Anchor处获取UE的Context，并执行后续切换流程，由于UE的Context会占用较大的信令空间，不在信令中携带UE的Context而是从Anchor处获取的方式可以大大降低网络的信令负荷。此外，由于源基站与目标基站之间的X2接口时延较大，目标基站从Anchor处获取UE的Context，在允许UE接入时可以直接根据UE的Context与UE建立RRC连接，从而可以加快小区的切换速度。
请参阅图2，为本发明实施例提供的一种小区切换方法的第一实施例流程示意图。本实施例中所描述的小区切换方法主要是从源基站一侧进行描述的，包括以下步骤：
S201、源基站向处于连接态的UE单播包括DRX周期的RRC信令，所述RRC信令用于指示所述UE根据所述DRX周期保持在所述连接态。
其中，现有LTE系统中，根据第三代合作伙伴计划(英文：3rd Generation Partnership Project，缩写：3GPP)规定[TS 36.300]，UE只有两种RRC状态：
(1)RRC_IDLE(空闲态)，该状态包含以下特点：
a)PLMN选择
b)NAS配置的DRX
c)广播的系统信息
d)寻呼
e)基于小区重选的移动性
f)为UE分配一个在TA内唯一的ID
g)eNB侧没有储存UE的RRC上下文(Context)
h)D2D通信发送与接收
i)D2D发现与监控
(2)RRC_CONNECTED(连接态)，该状态包含以下特点：
a)UE具有E-UTRAN-RRC连接
b)UE在E-UTRAN具有Context
c)E-UTRAN知道UE属于哪个小区
d)网络能够与UE互相接收和发送数据
e)网络控制的移动性
f)邻小区测量
g)D2D通信发送与接收
h)D2D发现与监控
i)从PDCP/RLC/MAC层面：
i.UE能够与网络互相接收和发送数据
ii.UE检测针对共享数据信道的控制信令
其中，DRX的基本机制是为处于连接态的UE配置一个DRX周期。DRX 周期由“On Duration”和“Opportunity for DRX”组成，在“On Duration”期间，UE监听并接收PDCCH，也就是UE处于激活期；在“Opportunity for DRX”期间，UE不接收下行信道的数据以节省功耗，也就是UE处于休眠期。基站可以通过单播RRC信令来配置激活期和休眠期的长度，当DRX周期较长时，基站即可控制UE长时间地处于连接态。
S202、源基站获取所述UE发送的测量报告，并根据所述测量报告进行切换决策。
具体的，该源基站根据该测量报告判断是否存在满足预设的切换准则(例如相对信号强度准则、具有门限规定的相对信号强度准则、具有滞后余量的相对信号强度准则和具有滞后余量或门限规定的相对信号强度准则等)的小区，以及是否需要进行站间切换，进而做出切换决策。
S203、所述源基站根据所述切换决策向目标基站发送切换请求消息，所述切换请求消息用于指示所述目标基站从与所述目标基站连接的锚点Anchor处获取所述UE的上下文Context，并在根据所述UE的Context确定允许所述UE切换后，与所述UE建立RRC连接。
其中，本发明实施例中的Anchor可以采用集中式部署，即LTE网络中的多个基站同时连接到一个Anchor，一个Anchor同时服务多个基站，可以提高系统效率，例如新型无线接入网构架C-RAN架构中的基带单元(英文：Bandwidth Based Unit，缩写：BBU)池；也可以采用分布式部署，即为每一个基站单独配置一个Anchor，可以提高系统的鲁棒性和稳定性。Anchor主要用于存储UE的Context，Anchor可以作为基站的一部分，也可以作为一个独立的网络实体。Anchor与基站之间可以采用光纤连接，以提高数据的传输速度。
其中，基站可以向连接的Anchor上报服务的UE的Context，Anchor也可以从核心网侧，例如移动性管理实体(英文：Mobile Management Entity，缩写：MME)获取对应基站所服务的UE的Context。集中式部署的Anchor存储有连接的基站所服务的部分或者全部UE的Context。分布式部署的Anchor存储有连接的基站以及待选基站(例如邻基站)所服务的部分或者全部UE的Context，Anchor之间可以通过各自连接的基站将自身存储的UE Context发送 给待选基站连接的Anchor。
此外，优选的，Anchor还可对UE的Context进行更新，用于添加新的UE的Context，以及在Anchor的剩余存储空间较少时可以将没有业务传输(包括发起业务和接收业务)持续的时长超过预设时长(例如1天)的UE的Context删除。
具体的，该源基站在该切换决策为站间切换时，通过X2接口向该目标基站发送切换请求消息，该切换请求消息可以是HANDOVER REQUEST信令，该HANDOVER REQUEST信令不携带该UE的Context，该目标基站收到该HANDOVER REQUEST信令后直接从其连接的Anchor处获取该UE的Context，如果该目标基站根据该UE的Context确定允许该UE切换，则该目标基站可以与该UE直接建立RRC连接。
在一些可行的实施方式中，如果该目标基站在从该Anchor处获取该UE的Context失败，则该目标基站可以向该源基站发送Context获取请求，从而该源基站可以再通过X2接口向该目标基站发送该UE的Context，保证了目标基站从Anchor处获取UE的Context失败时快速切换至现有的切换流程继续进行。
本发明实施例中，源基站向处于连接态的UE单播包括DRX周期的RRC信令，该RRC信令用于指示该UE根据该DRX周期保持在该连接态，该源基站根据该UE上报的测量报告进行切换决策，并根据该切换决策向目标基站发送切换请求消息，该切换请求消息用于指示该目标基站从与该目标基站连接的Anchor处获取该UE的Context，并在根据该UE的Context确定允许该UE切换后，与该UE建立RRC连接，目标基站不通过源基站发送的信令获取该UE的Context，而是从存储有UE Context的Anchor处获取该UE的Context，可以降低网络的信令负荷，并加快小区的切换速度。
请参阅图3，为本发明实施例提供的一种小区切换方法的第二实施例流程示意图。本实施例中所描述的小区切换方法主要是从目标基站一侧进行描述的，包括以下步骤：
S301、目标基站接收源基站根据切换决策发送的切换请求消息，所述切换 决策由所述源基站根据UE发送的测量报告做出。
S302、所述目标基站响应所述切换请求消息从与所述目标基站连接的Anchor处获取所述UE的Context。
S303、在所述目标基站根据所述UE的Context确定允许所述UE切换的情况下，所述目标基站与所述UE建立RRC连接。
其中，该切换请求消息不携带该UE的Context。
具体的，该目标基站响应该切换请求消息直接从其连接的Anchor处获取该UE的Context，如果根据该UE的Context确定允许该UE切换，则该目标基站可以与该UE直接建立RRC连接。
本发明实施例中，目标基站响应源基站发送的切换请求消息，从与该目标基站连接的Anchor处获取UE的Context，并在根据该UE的Context确定允许该UE切换的情况下，与该UE建立RRC连接，目标基站不通过源基站发送的信令获取该UE的Context，而是从存储有UE Context的Anchor处获取该UE的Context，可以降低网络的信令负荷，并加快小区的切换速度。
请参阅图4，为本发明实施例提供的一种小区切换方法的第三实施例流程示意图。本实施例中所描述的小区切换方法主要是从Anchor一侧进行描述的，包括以下步骤：
S401、Anchor接收目标基站在接收到源基站发送的切换请求消息时发送的UE的Context的获取请求。
其中，该Anchor连接该源基站以及多个待选基站，该目标基站为该多个待选基站中的一个，并存储该源基站和该多个待选基站服务的部分或者所有UE的Context，即Anchor集中式部署，多个基站连接同一个Anchor，基站与Anchor之间为多对一的关系。
或者，该目标基站为该多个待选基站中的一个，该源基站和该待选基站中的每一个基站都与一个Anchor连接，每一个基站连接的Anchor存储该每一个基站和该每一个基站的邻基站服务的部分或者所有UE的Context，即Anchor分布式部署，每一个基站各自连接一个Anchor，基站与Anchor之间为一对一的关系。
其中，Anchor可以接收并存储连接的基站上报的UE的Context，也可以从核心网侧，例如MME，获取对应基站所服务的UE的Context。
S402、所述Anchor响应所述获取请求向所述目标基站发送所述UE的Context，所述UE的Context用于指示所述目标基站在根据所述UE的Context确定允许所述UE切换后，与所述UE建立RRC连接。
具体的，该切换请求消息不携带该UE的Context，该目标基站需要从连接的该Anchor处获取该UE的Context，则向该Anchor发送该UE的Context的获取请求，该获取请求中可以携带该UE的标识信息，收到该获取请求后，该Anchor根据该UE的标识信息查找存储的该UE的Context，并向该目标基站发送该UE的Context，从而该目标基站在根据该UE的Context确定允许该UE切换后，即可与该UE建立RRC连接。
S403、所述Anchor在剩余存储空间小于或等于预设值时删除没有业务传输所持续的时长达到预设时长的UE的Context。
具体的，该Anchor可以在Anchor的剩余存储空间较少时将没有业务传输(包括发起业务和接收业务)持续的时长超过预设时长(例如1天)的UE的Context删除。
本发明实施例中，Anchor接收目标基站发送的UE Context的获取请求，响应该获取请求后向该目标基站发送该UE的Context，则该目标基站在根据该UE的Context确定允许该UE切换后，即可与该UE建立RRC连接；此外，该Anchor在剩余存储空间较少时可以删除没有业务传输所持续的时长达到预设时长的UE的Context。由于Anchor存储有UE的Context，目标基站不需要通过源基站发送的信令获取UE的Context，而是从Anchor处直接获取，从而可以降低网络的信令负荷，并加快小区的切换速度。
请参阅图5，为本发明实施例提供的一种小区切换方法的第四实施例流程示意图。本实施例中所描述的小区切换方法主要是从UE一侧进行描述的，包括以下步骤：
S501、UE接收源基站单播的包括DRX周期的RRC信令，并根据所述DRX周期保持在连接态。
其中，DRX周期由“On Duration”和“Opportunity for DRX”组成，在“On Duration”期间，UE监听并接收PDCCH，也就是UE处于激活期；在“Opportunity for DRX”期间，UE不接收下行信道的数据以节省功耗，也就是UE处于休眠期。当该源基站配置的DRX周期较长时，该UE可以长时间地处于连接态。
S502、所述UE接收所述源基站发送的用于小区切换的测量配置参数，根据所述测量配置参数进行小区测量，并生成测量报告。
具体的，该UE与该源基站建立RRC连接后，在无线承载建立时，该UE接收该源基站下发的测量配置参数，并按照该测量配置参数进行小区测量，进而生成测量报告。
S503、所述UE向所述源基站发送所述测量报告，所述测量报告用于指示所述源基站根据所述测量报告进行切换决策，并根据所述切换决策向目标基站发送切换请求消息，所述切换请求消息用于指示所述目标基站从与所述目标基站连接的Anchor处获取所述UE的Context。
具体的，该UE将该测量报告上报给该源基站，该源基站根据该测量报告做出切换决策，在确定进行站间切换时向目标基站发送切换请求消息，进而该目标基站从连接的Anchor处获取该UE的Context。
S504、所述UE响应所述目标基站在根据所述UE的Context确定允许所述UE切换后发送的RRC连接建立指示，与所述目标基站建立RRC连接。
具体的，该目标基站在根据该UE的Context确定允许该UE切换后可以向该UE发送RRC连接建立指示，该UE接收到该RRC连接建立指示后即可与该目标基站建立RRC连接。
本发明实施例中，UE接收源基站单播的包括DRX周期的RRC信令，并根据该DRX周期长时间地保持在连接态，该UE根据源基站发送的测量配置参数进行小区测量，并生成测量报告，将该测量报告上报给该源基站，使得该源基站根据该测量报告进行切换决策，并在进行站间切换时向目标基站发送切换请求消息，使得该目标基站从连接的Anchor处获取该UE的Context，并在根据该UE的Context确定允许该UE切换后向该UE发送RRC连接建立指示，从而该UE即可与该目标基站建立RRC连接，该源基站不在向目标基站发送 的信令中携带该UE的Context，而是该目标基站从存储有UE Context的Anchor处获取该UE的Context，从而可以降低网络的信令负荷，并加快小区的切换速度。
举例来说，如图6所示，Anchor采用集中式部署，适用于小基站密集部署场景，基站#1～基站#5连接到同一个Anchor，该Anchor存储基站#1～基站#5服务过的UE的Context，位置#1处，UE开机进入空闲态，该UE移动至位置#2处时有视频业务产生，该UE与基站#2建立RRC连接，基站#2可以将该UE的Context上报给该Anchor，该UE从该空闲态切换为连接态，并进行小区切换流程，该UE移动至位置#3处时视频业务结束，该UE继续保持连接态，移动至位置#4时，如果该UE的测量报告指示基站#3(即目标基站)的信号强度强于基站#2(即源基站)的信号强度，则基站#2向基站#3发送切换请求消息，基站#3从该Anchor中获取该UE的Context，如果基站#3允许该UE切换，则可以直接建立与该UE的RRC连接，从而快速完成小区切换，并降低了网络的信令负荷。
再举例来说，如图7所示，Anchor采用分布式部署，适用于宏基站部署场景，基站#1～基站#7分别连接一个Anchor，每一个Anchor存储与其连接的基站所服务的UE的Context以及与其连接的基站的邻基站所服务的UE的Context，与基站#2连接的Anchor除了存储基站#2所服务的UE的Context之外，还存储基站#2的邻基站(即基站#1、基站#3、基站#4、基站#5、基站#6和基站#7)所服务的UE的Context，位置#1处，UE开机进入空闲态，该UE移动至位置#2处时有视频业务产生，该UE与基站#2建立RRC连接，基站#2可以将该UE的Context上报给与基站#2连接的Anchor，而基站#2连接的Anchor可以通过基站#2将该UE的Context发送给基站#2的邻基站连接的Anchor进行存储，该UE从该空闲态切换为连接态，并进行小区切换流程，该UE移动至位置#3处时视频业务结束，该UE继续保持连接态，移动至位置#4时，如果该UE的测量报告指示基站#3(即目标基站)的信号强度强于基站#2(即源基站)的信号强度，则基站#2向基站#3发送切换请求消息，基站#3从 其连接的Anchor中获取该UE的Context，如果基站#3允许该UE切换，则可以直接建立与该UE的RRC连接，从而快速完成小区切换，并降低了网络的信令负荷。
请参阅图8，为本发明实施例提供的一种基站的一实施例结构示意图。本实施例中所描述的基站，包括：
发送单元801，用于向处于连接态的UE单播包括DRX周期的RRC信令，所述RRC信令用于指示所述UE根据所述DRX周期保持在所述连接态。
获取单元802，用于获取UE发送的测量报告。
决策单元803，用于根据所述测量报告进行切换决策。
所述发送单元801，还用于根据所述切换决策向目标基站发送切换请求消息，所述切换请求消息用于指示所述目标基站从与所述目标基站连接的Anchor处获取所述UE的Context，并在根据所述UE的Context确定允许所述UE切换后，与所述UE建立RRC连接。
其中，所述Anchor与所述源基站以及多个待选基站连接，所述目标基站为所述多个待选基站中的一个，所述Anchor存储有所述源基站和所述多个待选基站服务的UE的Context。或者，所述目标基站为多个待选基站中的一个，所述源基站和所述待选基站中的每一个基站都与一个Anchor连接，所述每一个基站连接的Anchor存储有所述每一个基站和所述每一个基站的邻基站服务的UE的Context。
其中，所述发送单元801根据所述切换决策向目标基站发送切换请求消息的具体方式为：
在所述切换决策为站间切换时，通过X2接口向目标基站发送切换请求消息。
需要说明的是，本发明实施例的基站的各单元的功能可根据上述方法实施例中的方法具体实现，其具体实现过程可以参照上述方法实施例的相关描述，此处不再赘述。
本发明实施例中，源基站向处于连接态的UE单播包括DRX周期的RRC信令，该RRC信令用于指示该UE根据该DRX周期保持在该连接态，该源基 站根据该UE上报的测量报告进行切换决策，并根据该切换决策向目标基站发送切换请求消息，该切换请求消息用于指示该目标基站从与该目标基站连接的Anchor处获取该UE的Context，并在根据该UE的Context确定允许该UE切换后，与该UE建立RRC连接，目标基站不通过源基站发送的信令获取该UE的Context，而是从存储有UE Context的Anchor处获取该UE的Context，可以降低网络的信令负荷，并加快小区的切换速度。
请参阅图9，为本发明实施例提供的一种基站的一实施例结构示意图。本实施例中所描述的基站，包括：
接收单元901，用于接收源基站根据切换决策发送的切换请求消息，所述切换决策由所述源基站根据UE发送的测量报告做出。
获取单元902，用于响应所述切换请求消息从与所述基站连接的Anchor处获取所述UE的Context。
确定单元903，用于根据所述UE的Context确定是否允许所述UE切换。
连接单元904，用于在所述确定单元确定出允许所述UE切换的情况下，与所述UE建立RRC连接。
其中，所述Anchor与所述源基站以及多个待选基站连接，所述目标基站为所述多个待选基站中的一个，所述Anchor存储有所述源基站和所述多个待选基站服务的UE的Context。或者，所述目标基站为多个待选基站中的一个，所述源基站和所述待选基站中的每一个基站都与一个Anchor连接，所述每一个基站连接的Anchor存储有所述每一个基站和所述每一个基站的邻基站服务的UE的Context。
需要说明的是，本发明实施例的基站的各单元的功能可根据上述方法实施例中的方法具体实现，其具体实现过程可以参照上述方法实施例的相关描述，此处不再赘述。
本发明实施例中，目标基站响应源基站发送的切换请求消息，从与该目标基站连接的Anchor处获取UE的Context，并在根据该UE的Context确定允许该UE切换的情况下，与该UE建立RRC连接，目标基站不通过源基站发送的信令获取该UE的Context，而是从存储有UE Context的Anchor处获取该 UE的Context，可以降低网络的信令负荷，并加快小区的切换速度。
请参阅图10，为本发明实施例提供的一种Anchor的一实施例结构示意图。本实施例中所描述的Anchor，包括：
接收单元1001，用于接收目标基站在接收到源基站发送的切换请求消息时发送的UE的Context的获取请求。
发送单元1002，用于响应所述获取请求向所述目标基站发送所述UE的Context，所述UE的Context用于指示所述目标基站在根据所述UE的Context确定允许所述UE切换后，与所述UE建立RRC连接。
UE的Context更新单元1003，用于在剩余存储空间小于或等于预设值时删除没有业务传输所持续的时长达到预设时长的UE的Context。
其中，所述Anchor与所述源基站以及多个待选基站连接，所述目标基站为所述多个待选基站中的一个，所述Anchor存储有所述源基站和所述多个待选基站服务的UE的Context。或者，所述目标基站为多个待选基站中的一个，所述源基站和所述待选基站中的每一个基站都与一个Anchor连接，所述每一个基站连接的Anchor存储有所述每一个基站和所述每一个基站的邻基站服务的UE的Context。
需要说明的是，本发明实施例的Anchor的各单元的功能可根据上述方法实施例中的方法具体实现，其具体实现过程可以参照上述方法实施例的相关描述，此处不再赘述。
本发明实施例中，Anchor接收目标基站发送的UE Context的获取请求，响应该获取请求后向该目标基站发送该UE的Context，则该目标基站在根据该UE的Context确定允许该UE切换后，即可与该UE建立RRC连接；此外，该Anchor在剩余存储空间较少时可以删除没有业务传输所持续的时长达到预设时长的UE的Context。由于Anchor存储有UE的Context，目标基站不需要通过源基站发送的信令获取UE的Context，而是从Anchor处直接获取，从而可以降低网络的信令负荷，并加快小区的切换速度。
请参阅图11，为本发明实施例提供的一种UE的第一实施例结构示意图。 本实施例中所描述的UE，包括：
接收单元1101，用于接收源基站单播的包括DRX周期的RRC信令。
控制单元1102，用于根据所述DRX周期保持在连接态。
所述接收单元1101，还用于接收所述源基站发送的用于小区切换的测量配置参数。
测量单元1103，用于根据所述测量配置参数进行小区测量，并生成测量报告。
发送单元1104，用于向所述源基站发送所述测量报告，所述测量报告用于指示所述源基站根据所述测量报告进行切换决策，并根据所述切换决策向目标基站发送切换请求消息，所述切换请求消息用于指示所述目标基站从与所述目标基站连接的Anchor处获取所述UE的Context。
所述接收单元1101，还用于接收所述目标基站在根据所述UE的Context确定允许所述UE切换后发送的RRC连接建立指示。
连接单元1105，用于响应所述RRC连接建立指示，与所述目标基站建立RRC连接。
需要说明的是，本发明实施例的UE的各单元的功能可根据上述方法实施例中的方法具体实现，其具体实现过程可以参照上述方法实施例的相关描述，此处不再赘述。
本发明实施例中，UE接收源基站单播的包括DRX周期的RRC信令，并根据该DRX周期长时间地保持在连接态，该UE根据源基站发送的测量配置参数进行小区测量，并生成测量报告，将该测量报告上报给该源基站，使得该源基站根据该测量报告进行切换决策，并在进行站间切换时向目标基站发送切换请求消息，使得该目标基站从连接的Anchor处获取该UE的Context，并在根据该UE的Context确定允许该UE切换后向该UE发送RRC连接建立指示，从而该UE即可与该目标基站建立RRC连接，该源基站不在向目标基站发送的信令中携带该UE的Context，而是该目标基站从存储有UE Context的Anchor处获取该UE的Context，从而可以降低网络的信令负荷，并加快小区的切换速度。
请参阅图12，为本发明实施例提供的一种UE的第二实施例结构示意图。本实施例中所描述的UE，包括：至少一个输入设备1201；至少一个输出设备1202；至少一个处理器1203，例如CPU；和存储器1204，上述输入设备1201、输出设备1202、处理器1203和存储器1204通过总线1205连接。
其中，上述输入设备1201具体可以为射频模块，用于接收基站发送的信号。
上述输出设备1202具体可以为射频模块，用于向基站发送信号。
上述存储器1204可以是高速RAM存储器，也可为非不稳定的存储器(non-volatile memory)，例如磁盘存储器。上述存储器1204用于存储一组程序代码，上述输入设备1201、输出设备1202和处理器1203用于调用存储器1204中存储的程序代码，执行如下操作：
上述输入设备1201，用于接收源基站单播的包括DRX周期的RRC信令。
上述处理器1203，用于根据所述DRX周期保持在连接态。
上述输入设备1201，还用于接收源基站发送的用于小区切换的测量配置参数。
上述处理器1203，还用于根据所述测量配置参数进行小区测量，并生成测量报告。
上述输出设备1202，用于向所述源基站发送所述测量报告，所述测量报告用于指示所述源基站根据所述测量报告进行切换决策，并根据所述切换决策向目标基站发送切换请求消息，所述切换请求消息用于指示所述目标基站从与所述目标基站连接的Anchor处获取所述UE的Context。
上述处理器1203，还用于响应所述目标基站在根据所述UE的Context确定允许所述UE切换后发送的RRC连接建立指示，与所述目标基站建立RRC连接。
具体实现中，本发明实施例中所描述的输入设备1201、输出设备1202和处理器1203可执行本发明实施例提供的一种小区切换方法的第四实施例中所描述的实现方式，也可执行本发明实施例提供的一种UE的第一实施例中所描述的UE的实现方式，在此不再赘述。
本发明实施例中，UE接收源基站单播的包括DRX周期的RRC信令，并 根据该DRX周期长时间地保持在连接态，该UE根据源基站发送的测量配置参数进行小区测量，并生成测量报告，将该测量报告上报给该源基站，使得该源基站根据该测量报告进行切换决策，并在进行站间切换时向目标基站发送切换请求消息，使得该目标基站从连接的Anchor处获取该UE的Context，并在根据该UE的Context确定允许该UE切换后向该UE发送RRC连接建立指示，从而该UE即可与该目标基站建立RRC连接，该源基站不在向目标基站发送的信令中携带该UE的Context，而是该目标基站从存储有UE Context的Anchor处获取该UE的Context，从而可以降低网络的信令负荷，并加快小区的切换速度。
请参阅图13，为本发明实施例提供的一种小区切换系统的一实施例结构示意图。本实施例中所描述的小区切换系统，包括UE1301、源基站1302、目标基站1303和Anchor1304，其中：
所述源基站1302，用于向处于连接态的所述UE单播包括DRX周期的RRC信令。
所述UE1301，用于接收所述RRC信令，并根据所述DRX周期保持在所述连接态。
所述源基站1302，还用于向处于连接态的所述UE发送用于小区切换的测量配置参数。
所述UE1301，还用于接收所述测量配置参数，根据所述测量配置参数进行小区测量，并生成测量报告。
所述UE1301，还用于向所述源基站发送所述测量报告。
所述源基站1302，还用于接收所述测量报告，并根据所述测量报告进行切换决策。
所述源基站1302，还用于根据所述切换决策向目标基站发送切换请求消息。
所述目标基站1303，用于接收所述切换请求消息，并响应所述切换请求消息从与所述目标基站连接的Anchor1304处获取所述UE的Context。
所述目标基站1303，还用于在根据所述UE的Context确定允许所述UE 切换后向所述UE发送RRC连接建立指示。
所述UE1301，还用于响应所述RRC连接建立指示，与所述目标基站建立RRC连接。
本发明实施例中，源基站向处于连接态的该UE单播包括DRX周期的RRC信令，该UE110根据该DRX周期长时间地保持在连接态；源基站向UE下发用于小区切换的测量配置参数，该UE根据该测量配置参数进行小区测量并生成测量报告，并向该源基站发送该测量报告，该源基站根据该测量报告进行切换决策，在进行站间切换时向目标基站发送切换请求消息，该目标基站响应该切换请求消息从连接的Anchor处获取该UE的Context，并在根据该UE的Context确定允许该UE切换后与该UE建立RRC连接，该目标基站不通过该源基站发送的信令获取该UE的Context，而是从存储有UE Context的Anchor处获取该UE的Context，可以降低网络的信令负荷，并加快小区的切换速度。
本发明所有实施例中的单元，可以通过通用集成电路，例如CPU(Central Processing Unit，中央处理器)，或通过ASIC(Application Specific Integrated Circuit，专用集成电路)来实现。
本发明实施例方法中的步骤可以根据实际需要进行顺序调整、合并和删减。
本发明实施例终端中的单元可以根据实际需要进行合并、划分和删减。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存取存储器(Random Access Memory，简称RAM)等。
以上对本发明实施例所提供的一种小区切换方法、系统及相关设备进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。

Claims (23)

  1. 一种小区切换方法，其特征在于，包括：
    源基站向处于连接态的用户终端UE单播包括非连续接收DRX周期的无线资源控制RRC信令，所述RRC信令用于指示所述UE根据所述DRX周期保持在所述连接态；
    源基站获取所述UE发送的测量报告，并根据所述测量报告进行切换决策；
    所述源基站根据所述切换决策向目标基站发送切换请求消息，所述切换请求消息用于指示所述目标基站从与所述目标基站连接的锚点Anchor处获取所述UE的上下文Context，并在根据所述UE的Context确定允许所述UE切换后，与所述UE建立RRC连接。
  2. 根据权利要求1所述的方法，其特征在于，所述源基站根据所述切换决策向目标基站发送切换请求消息，包括：
    所述源基站在所述切换决策为站间切换时，通过X2接口向目标基站发送切换请求消息。
  3. 根据权利要求1或2所述的方法，其特征在于，
    所述Anchor与所述源基站以及多个待选基站连接，所述目标基站为所述多个待选基站中的一个，所述Anchor存储有所述源基站和所述多个待选基站服务的UE的Context。
  4. 根据权利要求1或2所述的方法，其特征在于，
    所述目标基站为多个待选基站中的一个，所述源基站和所述待选基站中的每一个基站都与一个Anchor连接，所述每一个基站连接的Anchor存储有所述每一个基站和所述每一个基站的邻基站服务的UE的Context。
  5. 根据权利要求1～4中任一项所述的方法，其特征在于，所述方法还包括：
    所述源基站接收所述目标基站在从所述Anchor处获取所述UE的Context 失败时发送的所述UE的Context的获取请求；
    所述源基站响应所述获取请求，向所述目标基站发送所述UE的Context，所述UE的Context用于指示所述目标基站在根据所述UE的Context确定允许所述UE切换后，与所述UE建立RRC连接。
  6. 一种小区切换方法，其特征在于，包括：
    目标基站接收源基站根据切换决策发送的切换请求消息，所述切换决策由所述源基站根据UE发送的测量报告做出；
    所述目标基站响应所述切换请求消息从与所述目标基站连接的Anchor处获取所述UE的Context；
    在所述目标基站根据所述UE的Context确定允许所述UE切换的情况下，所述目标基站与所述UE建立RRC连接。
  7. 根据权利要求6所述的方法，其特征在于，
    所述Anchor与所述源基站以及多个待选基站连接，所述目标基站为所述多个待选基站中的一个，所述Anchor存储有所述源基站和所述多个待选基站服务的UE的Context。
  8. 根据权利要求6所述的方法，其特征在于，
    所述目标基站为多个待选基站中的一个，所述源基站和所述待选基站中的每一个基站都与一个Anchor连接，所述每一个基站连接的Anchor存储有所述每一个基站和所述每一个基站的邻基站服务的UE的Context。
  9. 根据权利要求6～8中任一项所述的方法，其特征在于，所述方法还包括：
    所述目标基站在从所述Anchor处获取所述UE的Context失败时向所述源基站发送所述UE的Context的获取请求；
    所述目标基站接收所述源基站响应所述获取请求而发送的所述UE的Context，并在根据所述UE的Context确定允许所述UE切换后，与所述UE 建立RRC连接。
  10. 一种小区切换方法，其特征在于，包括：
    Anchor接收目标基站在接收到源基站发送的切换请求消息时发送的UE的Context的获取请求；
    所述Anchor响应所述获取请求向所述目标基站发送所述UE的Context，所述UE的Context用于指示所述目标基站在根据所述UE的Context确定允许所述UE切换后，与所述UE建立RRC连接。
  11. 根据权利要求10所述的方法，其特征在于，所述方法还包括：
    所述Anchor连接所述源基站以及多个待选基站，所述目标基站为所述多个待选基站中的一个；
    所述Anchor存储所述源基站和所述多个待选基站服务的UE的Context。
  12. 根据权利要求10所述的方法，其特征在于，所述方法还包括：
    所述目标基站为多个待选基站中的一个，所述源基站和所述待选基站中的每一个基站都与一个Anchor连接，所述每一个基站连接的Anchor存储所述每一个基站和所述每一个基站的邻基站服务的UE的Context。
  13. 根据权利要求10所述的方法，其特征在于，所述方法还包括：
    所述Anchor在剩余存储空间小于或等于预设值时删除没有业务传输所持续的时长达到预设时长的UE的Context。
  14. 一种小区切换方法，其特征在于，包括：
    UE接收源基站单播的包括DRX周期的RRC信令，并根据所述DRX周期保持在连接态；
    所述UE接收所述源基站发送的用于小区切换的测量配置参数，根据所述测量配置参数进行小区测量，并生成测量报告；
    所述UE向所述源基站发送所述测量报告，所述测量报告用于指示所述源 基站根据所述测量报告进行切换决策，并根据所述切换决策向目标基站发送切换请求消息，所述切换请求消息用于指示所述目标基站从与所述目标基站连接的Anchor处获取所述UE的Context；
    所述UE响应所述目标基站在根据所述UE的Context确定允许所述UE切换后发送的RRC连接建立指示，与所述目标基站建立RRC连接。
  15. 一种基站，其特征在于，包括：
    发送单元，用于向处于连接态的UE单播包括DRX周期的RRC信令，所述RRC信令用于指示所述UE根据所述DRX周期保持在所述连接态；
    获取单元，用于获取所述UE发送的测量报告；
    决策单元，用于根据所述测量报告进行切换决策；
    所述发送单元，还用于根据所述切换决策向目标基站发送切换请求消息，所述切换请求消息用于指示所述目标基站从与所述目标基站连接的Anchor处获取所述UE的Context，并在根据所述UE的Context确定允许所述UE切换后，与所述UE建立RRC连接。
  16. 根据权利要求15所述的基站，其特征在于，所述发送单元根据所述切换决策向目标基站发送切换请求消息的具体方式为：
    在所述切换决策为站间切换时，通过X2接口向目标基站发送切换请求消息。
  17. 一种基站，其特征在于，包括：
    接收单元，用于接收源基站根据切换决策发送的切换请求消息，所述切换决策由所述源基站根据UE发送的测量报告做出；
    获取单元，用于响应所述切换请求消息从与所述基站连接的Anchor处获取所述UE的Context；
    确定单元，用于根据所述UE的Context确定是否允许所述UE切换；
    连接单元，用于在所述确定单元确定出允许所述UE切换的情况下，与所述UE建立RRC连接。
  18. 一种Anchor，其特征在于，包括：
    接收单元，用于接收目标基站在接收到源基站发送的切换请求消息时发送的UE的Context的获取请求；
    发送单元，用于响应所述获取请求向所述目标基站发送所述UE的Context，所述UE的Context用于指示所述目标基站在根据所述UE的Context确定允许所述UE切换后，与所述UE建立RRC连接。
  19. 根据权利要求18所述的Anchor，其特征在于，所述Anchor还包括：
    UE的Context更新单元，用于在剩余存储空间小于或等于预设值时删除没有业务传输所持续的时长达到预设时长的UE的Context。
  20. 一种UE，其特征在于，包括：
    接收单元，用于接收源基站单播的包括DRX周期的RRC信令；
    控制单元，用于根据所述DRX周期保持在连接态；
    所述接收单元，还用于接收所述源基站发送的用于小区切换的测量配置参数；
    测量单元，用于根据所述测量配置参数进行小区测量，并生成测量报告；
    发送单元，用于向所述源基站发送所述测量报告，所述测量报告用于指示所述源基站根据所述测量报告进行切换决策，并根据所述切换决策向目标基站发送切换请求消息，所述切换请求消息用于指示所述目标基站从与所述目标基站连接的Anchor处获取所述UE的Context；
    所述接收单元，还用于接收所述目标基站在根据所述UE的Context确定允许所述UE切换后发送的RRC连接建立指示；
    连接单元，用于响应所述RRC连接建立指示，与所述目标基站建立RRC连接。
  21. 一种小区切换系统，其特征在于，包括UE、源基站、目标基站和Anchor，其中：
    所述源基站，用于向处于连接态的所述UE单播包括DRX周期的RRC信令；
    所述UE，用于接收所述RRC信令，并根据所述DRX周期保持在所述连接态；
    所述源基站，还用于向处于连接态的所述UE发送用于小区切换的测量配置参数；
    所述UE，还用于接收所述测量配置参数，根据所述测量配置参数进行小区测量，并生成测量报告；
    所述UE，还用于向所述源基站发送所述测量报告；
    所述源基站，还用于接收所述测量报告，并根据所述测量报告进行切换决策；
    所述源基站，还用于根据所述切换决策向目标基站发送切换请求消息；
    所述目标基站，用于接收所述切换请求消息，并响应所述切换请求消息从与所述目标基站连接的所述Anchor处获取所述UE的Context；
    所述目标基站，还用于在根据所述UE的Context确定允许所述UE切换后向所述UE发送RRC连接建立指示；
    所述UE，还用于响应所述RRC连接建立指示，与所述目标基站建立RRC连接。
  22. 根据权利要求21所述的系统，其特征在于，
    所述Anchor与所述源基站以及多个待选基站连接，所述目标基站为所述多个待选基站中的一个，所述Anchor存储有所述源基站和所述多个待选基站服务的UE的Context。
  23. 根据权利要求21所述的系统，其特征在于，
    所述目标基站为多个待选基站中的一个，所述源基站和所述待选基站中的每一个基站都与一个Anchor连接，所述每一个基站连接的Anchor存储有所述每一个基站和所述每一个基站的邻基站服务的UE的Context。
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CN105392156A (zh) * 2014-08-28 2016-03-09 苹果公司 用于执行用户设备触发的切换的方法和无线通信系统
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CN109831805B (zh) * 2019-01-17 2021-11-23 安徽深蓝大健康智能科技有限公司 一种提高大数据传输稳定性的方法及计算机可读存储介质
CN114270938A (zh) * 2019-08-15 2022-04-01 瑞典爱立信有限公司 在建立与目标接入节点的连接之后向源接入节点提供ul数据的发送的方法和相关无线设备
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