WO2016138749A1 - 用于基站切换中传输数据的方法、用户设备和基站、存储介质 - Google Patents

用于基站切换中传输数据的方法、用户设备和基站、存储介质 Download PDF

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Publication number
WO2016138749A1
WO2016138749A1 PCT/CN2015/088528 CN2015088528W WO2016138749A1 WO 2016138749 A1 WO2016138749 A1 WO 2016138749A1 CN 2015088528 W CN2015088528 W CN 2015088528W WO 2016138749 A1 WO2016138749 A1 WO 2016138749A1
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Prior art keywords
base station
connection
handover
bearer
scg bearer
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PCT/CN2015/088528
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English (en)
French (fr)
Inventor
王昕�
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中兴通讯股份有限公司
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Priority to US15/554,473 priority Critical patent/US20180049090A1/en
Priority to EP15883800.3A priority patent/EP3267724A1/en
Priority to JP2017545728A priority patent/JP2018512770A/ja
Publication of WO2016138749A1 publication Critical patent/WO2016138749A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • 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
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • 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
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the present invention relates to a base station handover technique in mobile communication, and in particular, to a method, a user equipment, a base station, and a storage medium for transmitting data in a base station handover.
  • the Third Generation Partnership Projects (3GPP) believes that the deployment of small cells and their improvement in capabilities are one of the important topics in the development of communication networks in the future; here, the small cells are referred to as low-power base stations.
  • the established cell is different from the cell Macro Cell established by the macro base station, and the small cell is generally called a Small Cell.
  • a heterogeneous network deployment scenario generally recognized by the communications industry is to deploy a low-power node within the coverage or boundary of a macro base station, and the macro base station and the low-power node together form an evolved universal terrestrial radio access network (Evolved).
  • the Access Network (RAN) in the Universal Terrestrial Radio Access Network (E-UTRAN) system provides a combined data transmission service for User Equipment (UE).
  • UE User Equipment
  • FIG. 1 is a schematic diagram of the system architecture in a typical heterogeneous network deployment scenario.
  • MME Mobility Management Entity
  • CN Core Network
  • a base station having an S1-MME interface and being regarded as a mobility anchor by the CN is called a master base station (MeNB); a node connected to the MeNB by an X2 interface and providing additional radio resources to the UE is called a secondary base station.
  • SeNB secondary base station
  • a wireless Uu interface is built between the UE and the MeNB and the SeNB, and control plane signaling and user plane data can be transmitted on the Uu interface.
  • the UE is considered to be in a dual connectivity state (Dual Connectivity, DC).
  • DC Dual Connectivity
  • This system architecture enables two (or even multiple) base stations to simultaneously provide radio resources for one UE and simultaneously perform communication services. Therefore, the data throughput of the network is greatly improved. Every effort can be made to meet the growing demand for data rates.
  • FIG. 2 is a schematic diagram of a user plane transmission mode and a protocol stack in a typical heterogeneous network deployment scenario. As shown in FIG. 2, the following row data is taken as an example.
  • a Packet Data Convergence Protocol Packet Data Convergence Protocol
  • the PDCP sub-layer can perform header compression and encryption on the IP data packet, and then send it to the Radio Link Control (RLC) sublayer, and then send it to the media access control.
  • RLC Radio Link Control
  • the transmission mode of the Evolved Packet System (EPS) bearer #1 is the same as the standard mode of the single-link system, that is, the Serving Gateway (S-GW) through the S1-U interface.
  • the data packet is sent to the MeNB, and the MeNB sends the data packet to the UE through the Uu port.
  • the wireless protocol stack is only located in the MeNB and only uses the bearer of the MeNB resource, which is called the primary base station cell group bearer (Master Cell Group). Bearer, MCG bearer).
  • the transmission of the EPS bearer #2 is to send the data packet to the SeNB through the S1-U interface between the S-GW and the SeNB, and then the SeNB sends the data packet to the UE through the Uu interface; the wireless protocol stack is completely located at the SeNB.
  • a bearer that uses only SeNB resources is called a Secondary Cell Group bearer (SCG bearer).
  • a variable in a protocol entity is accumulated to a certain threshold, some configuration parameters of the UE need to be modified;
  • the serving base station of the UE needs to switch from the currently connected eNB (referred to as source base station, source eNB) to another eNB with suitable conditions (referred to as Target base station, target eNB).
  • intra-eNB handover the UE still establishes a connection with the same eNB before and after the handover, only some parameters are re-allocated
  • inter-eNB handover the UE still establishes a connection with the same eNB before and after the handover, only some parameters are re-allocated
  • inter-eNB handover the UE still establishes a connection with the same eNB before and after the handover UE and different eNB
  • the SeNB of the UE when the MeNB of the UE in the DC state needs to perform handover, According to the prior art, the SeNB of the UE is released before the handover procedure or during the handover procedure. Further, if after the UE accesses the target eNB (for the intra-eNB handover, the target eNB is the original MeNB), there is still a base station node with suitable service requirements and conditions, and then the target eNB adds the SeNB to the UE.
  • the MeNB may simultaneously carry the Intra-MeNB handover information of the MeNB and the release and re-add information of the SeNB in one control plane signaling. That is, the UE is instructed to reconfigure the resources of the two eNBs by using only one air interface control plane signaling.
  • the user plane data transmission between the UE and the SeNB is interrupted due to the MeNB handover of the UE.
  • the time taken by the UE to access the target eNB cell is longer, the user plane data interruption time between the UE and the SeNB is also lengthened; this means that the network can
  • the radio resources provided by the UE are vacant, that is, the data throughput that the UE can be upgraded is limited, and the overall service performance of the network is also degraded.
  • embodiments of the present invention are directed to a method, a user equipment, a base station, and a storage medium for transmitting data in a base station handover.
  • the user equipment UE switches the primary base station MeNB from the first base station to the target base station according to the received radio resource control connection reconfiguration RRC CR message;
  • the UE maintains a connection with the second base station and does not change the protocol entity corresponding to the secondary base station cell group carrying SCG bearer reserved in the second base station transmission.
  • the method further includes: while the UE maintains a connection with the second base station and does not change the protocol entity corresponding to the SCG bearer transmitted by the second base station, the method further includes:
  • the UE leaves the first base station cell, synchronizes with the target base station cell, initiates random access to the target base station, and reconstructs or resets the protocol entity corresponding to the MCG bearer of the primary base station cell group;
  • the UE synchronizes with the first base station cell, initiates random access to the first base station, and carries the MCG with the primary base station cell group.
  • the protocol entity corresponding to the bearer is reconstructed or reset.
  • the UE adds or deletes the SCG bearer while maintaining the connection with the second base station and the protocol entity corresponding to the SCG bearer transmitted in the second base station, and performs the protocol entity corresponding to the SCG bearer. Rebuild or reset, or delete.
  • the UE performs user plane data transmission on the SCG bearer reserved for transmission by the second base station.
  • a UE provided by the embodiment of the present invention includes: a receiving module, a switching module, and a first protocol processing module, where
  • the receiving module is configured to receive a radio resource control connection reconfiguration RRC CR message
  • the switching module is configured to switch the primary base station MeNB from the first base station to the target base station;
  • the first protocol processing module is configured to maintain a connection with the second base station and a protocol entity corresponding to the secondary base station cell group carrying the SCG bearer remaining in the second base station transmission.
  • the first protocol processing module is further configured to re-establish or reset a protocol entity corresponding to the primary base station cell group carrying the MCG bearer; the switching module is further configured to leave the first base station cell and synchronize with the target base station cell, The target base station initiates random access;
  • the first protocol processing module is further configured to reconstruct or reset a protocol entity corresponding to the primary base station cell group carrying the MCG bearer;
  • the module is also synchronized with the first base station cell, to the said A base station initiates random access.
  • the first protocol processing module is further configured to add or delete the SCG bearer while maintaining the connection with the second base station and the protocol entity corresponding to the SCG bearer remaining in the second base station transmission, and The protocol entity corresponding to the SCG bearer is reconstructed or reset, or deleted.
  • the UE further includes a first transmission module configured to perform user plane data transmission on the SCG bearer reserved for transmission by the second base station.
  • the second base station keeps the connection with the UE and the protocol entity corresponding to the secondary base station cell group bearer SCG bearer transmitted by the second base station unchanged, in the User plane data scheduling is reserved on the SCG bearer transmitted by the second base station.
  • the method further includes: the first base station transmitting, to the second base station, a secondary base station SeNB release request, indicating that the second base station releases the X2 connection related to the UE between the first base station, and is related to the UE.
  • the release of the X2 connection does not affect the user plane data scheduling and resource configuration associated with the UE by the second base station, nor does it affect the context related to the UE saved on the second base station.
  • the method further includes: the first base station transmitting an MeNB intra-base station handover notification message to the second base station, and notifying the second base station that the MeNB has performed or is performing intra-base station handover.
  • a base station provided by the embodiment of the present invention includes: a second protocol processing module and a second transmission module, where
  • the second protocol processing module is configured to maintain a connection with the UE and a protocol corresponding to the secondary base station cell group carrying the SCG bearer transmitted by the second base station when the primary base station MeNB is switched from the first base station to the target base station. The entity remains unchanged;
  • the second transmission module is configured to be in the SCG bearer that is reserved for transmission at the second base station Perform user plane data scheduling on it.
  • the foregoing second protocol processing module is further configured to send a secondary base station SeNB release request to the second base station, indicating that the second base station releases the X2 connection related to the UE between the first base station and the X2 associated with the UE.
  • the release of the connection does not affect the user plane data scheduling and resource configuration associated with the UE by the second base station, nor does it affect the context related to the UE saved on the second base station.
  • the second protocol processing module is further configured to send an MeNB intra-base station handover notification message to the second base station, to notify the second base station that the MeNB has performed or is performing intra-base station handover.
  • a storage medium having stored therein a computer program configured to perform the aforementioned method for transmitting data in base station handover.
  • the method for transmitting data in base station handover, the user equipment, the base station, and the storage medium provided by the embodiment of the present invention, when the primary base station MeNB is switched from the first base station to the target base station, the connection between the UE and the second base station
  • the protocol entity corresponding to the secondary base station cell group carrying SCG bearer remaining in the second base station remains unchanged; thus, enabling the UE to maintain the connection with the second base station before and after the MeNB handover, that is, between the UE and the second base station
  • the data is transmitted continuously, thereby improving the data transmission performance and throughput of the UE. Meanwhile, the data transmission between the second base station and the UE is not affected by the MeNB handover, thereby improving the radio resource usage efficiency of the entire network.
  • Figure 1 is a schematic diagram of a system architecture in a typical heterogeneous network deployment scenario
  • FIG. 2 is a schematic diagram of a user plane transmission mode and a protocol stack in a typical heterogeneous network deployment scenario
  • FIG. 3 is a schematic diagram of a handover scenario of a method for transmitting data in a base station handover according to an embodiment of the present disclosure
  • FIG. 4 is a schematic flowchart 1 of a method for transmitting data in base station handover according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a method for transmitting data in base station handover according to an embodiment of the present invention.
  • Intent 2
  • FIG. 6 is a schematic flowchart 3 of a method for transmitting data in a base station handover according to an embodiment of the present invention
  • FIG. 7 is a schematic flowchart 4 of a method for transmitting data in a base station handover according to an embodiment of the present invention
  • FIG. 8 is a schematic structural diagram of a UE used for transmitting data in a base station handover according to an embodiment of the present disclosure
  • FIG. 9 is a schematic flowchart of a method for transmitting data in a base station handover according to another embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a base station used for transmitting data in a base station handover according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a handover scenario of a method for transmitting data in a base station handover according to an embodiment of the present invention, in which a UE establishes a wireless connection with a first base station and a second base station in an access network, and An interface is established between a base station and the second base station, and the interface may be an X2 port.
  • the control plane signaling and the user plane data may be transmitted between the UE and the first base station, and the control node signal and the user plane data may be transmitted between the first base station and the node corresponding to the core network.
  • the first base station is equivalent to the MeNB.
  • the primary base station MeNB refers to a base station role/status in the dual connection.
  • the first base station is the primary base station (MeNB), and is also the source base station (source MeNB) in the handover. After the handover, the target base station is switched.
  • the primary base station is also the target base station (target MeNB) in the handover; the user plane data can be transmitted between the UE and the second base station, and the user plane data can be transmitted between the second base station and the serving gateway in the core network.
  • the second base station is equivalent to the SeNB, and similarly, the secondary base station SeNB also refers to a type of base station role/status in the dual connection.
  • the number of the first base station and the second base station may be greater than one, that is, the UE may access multiple base stations at the same time; and, the first base station and the second base station may These are various types of base stations, such as low power base stations and/or macro base stations.
  • the signal quality of the UE is degraded between the serving cell (referred to as the first base station cell) of the first base station (which may also be referred to as the source base station in the mobile scenario) during the mobile process, and The signal quality of the target base station is increased. Meanwhile, the UE is always within the coverage of the second base station, that is, the signal quality between the UE and the second base station cell remains good. After determining that the base station node corresponding to the MeNB role is switched from the first base station to the target base station, the UE leaves the first base station cell and accesses the target base station cell.
  • the UE In the process of the MeNB being handed over from the first base station to the target base station, the UE maintains the connection with the second base station and the protocol entity corresponding to the SCG bearer remaining in the second base station transmission, and therefore, the UE and the second base station
  • the user plane data transmission between the UE and the second base station can be continuously transmitted without interruption, thereby effectively improving the performance and throughput of the UE to transmit data, and improving the radio resource use efficiency of the entire network.
  • the pair of protocol entities refers to a complete radio protocol stack carried in the node. As shown in FIG. 2, the PDCP sublayer, the RLC sublayer, the MAC sublayer, and the physical layer are included. Keeping the protocol entity unchanged means that the RRC resource configuration of the keeping protocol entity is unchanged, and the entity is not required to be reconstructed or reset.
  • the disclosed method for transmitting data in a base station handover includes the following steps:
  • Step 401 Determine to switch the primary base station MeNB from the first base station to the target base station;
  • the first base station may send a handover request message to the target base station, where the handover request message carries resource configuration information of the UE on the source network side, and the target base station determines, according to the resource configuration information, the access of the UE. Determining a connection status between the UE and the second base station and a bearer level resource configuration, and sending a handover request acknowledgement message to the first base station;
  • the first base station may also perform performing intra-base station handover according to parameters such as radio signal quality and keep the second base station cell and resource configuration unchanged; or, according to configuration parameters of the UE,
  • the situation determines that the intra-base station handover is performed; at this time, the target base station and the first base station are the same base station, and the first base station updates the resource configuration information.
  • Step 402 The first base station sends a Radio Resource Control Connection Reconfiguration (RRC CR) message to the UE.
  • RRC CR Radio Resource Control Connection Reconfiguration
  • the RRC CR message carries, in addition to the new resource configuration information, information indicating that the UE maintains a connection with the second base station and does not change the protocol entity corresponding to the SCG bearer reserved for transmission by the second base station.
  • Step 403 The UE switches the primary base station MeNB from the first base station to the target base station according to the received RRC CR message. Meanwhile, the UE maintains a connection with the second base station and a protocol entity corresponding to the SCG bearer reserved in the second base station transmission. constant;
  • the UE leaves the first base station cell, synchronizes with the target base station cell, initiates random access to the target base station, and reconstructs or resets the protocol entity corresponding to the MCG bearer.
  • the UE synchronizes with the first base station cell, initiates random access to the first base station, and reconstructs or resets the protocol entity corresponding to the MGW bearer of the MeNB resource.
  • the downlink/uplink data tunnel endpoint of the SCG bearer is kept unchanged, and the UE and the second base station can continue to perform user plane data scheduling on the SCG bearer; and can also maintain the connection with the SeNB and remain in the second.
  • the SCG bearer is added or deleted at the same time as the protocol entity corresponding to the SCG bearer transmitted by the base station, and the protocol entity corresponding to the SCG bearer is reconstructed or reset, or deleted, and the UE and the second base station continue to remain in the first User plane data scheduling is performed on the SCG bearer and/or the added SCG bearer transmitted by the second base station.
  • the UE may also send a RRC Connection Reconfiguration Complete (RRC CRC) message to the target base station, indicating that the UE has enabled new resource configuration.
  • RRC CRC RRC Connection Reconfiguration Complete
  • the target base station may further send the core base station to the core network node. And sending a path switching indication message, indicating a change of the downlink/uplink data tunnel endpoint of the MCG bearer assumed by the target base station and the SCG bearer added by the second base station.
  • the method for transmitting data in base station handover enables the UE to maintain a connection with the second base station before and after the MeNB handover and to correspond to the SCG bearer reserved for transmission at the second base station.
  • the protocol entity remains unchanged, and the UE and the second base station can continue to perform user plane data scheduling on the SCG bearer, thereby improving the data transmission performance and throughput of the UE; meanwhile, the data transmission between the second base station and the UE is not affected by the MeNB.
  • the impact of switching thereby improving the efficiency of wireless resource usage throughout the network.
  • the disclosed method for transmitting data in base station handover includes the following steps:
  • Step 501 In the handover preparation phase, determine that an inter-base station handover needs to be performed
  • the UE is configured with two bearers, that is, an MCG bearer established with the first base station and an SCG bearer established with the second base station;
  • the first base station sends a handover request message to the target base station, where the handover request message carries resource configuration information of the UE on the source network side;
  • the target base station After the target base station determines to perform inter-base station handover, it sends a handover request acknowledgement message to the first base station, where the handover request acknowledgement message carries new resource configuration information.
  • Step 502 The first base station sends an RRC CR message to the UE, instructing the UE to switch the MeNB from the first base station to the target base station.
  • the RRC CR message carries, in addition to the new resource configuration information, information indicating that the UE maintains the connection with the second base station and does not change the protocol entity corresponding to the SCG bearer reserved in the second base station transmission;
  • the RRC CR message carries an indication that the UE maintains a connection with the second base station and
  • the information unchanged from the protocol entity corresponding to the SCG bearer transmitted at the second base station may not include the existing mobility control information Mobility Control Info.
  • Step 503 The UE keeps the connection with the second base station according to the RRC CR message and the protocol entity corresponding to the SCG bearer reserved in the second base station unchanged;
  • the downlink/uplink data tunnel endpoint of the SCG bearer is kept unchanged, and the UE and the second base station continue to perform user plane data scheduling on the SCG bearer.
  • Steps 504 to 509 described below may be performed simultaneously with this step or separately.
  • Step 504 The UE initiates random access to the target base station.
  • the UE leaves the first base station cell, synchronizes with the target base station cell, and initiates random access to the target base station.
  • the protocol entity corresponding to the MCG bearer is reconstructed or reset according to the new resource configuration information.
  • Step 505 The UE sends an RRC CRC message to the target base station, indicating that the UE has enabled new resource configuration.
  • the target base station After receiving the RRC CRC message, the target base station can perform the user plane transmission scheduling directly to the UE.
  • Step 506 The first base station forwards the number information and the data packet of the MCG bearer data packet to the target base station according to the handover request acknowledgement message.
  • Step 507 The target base station sends a path switching indication message to the core network node (including the MME and the S-GW), indicating the change of the downlink/uplink data tunnel endpoint of the MCG bearer assumed by the target base station;
  • the core network node including the MME and the S-GW
  • the path transition does not include the transition of the downlink/uplink tunnel endpoint of the SCG bearer still remaining in the second base station, that is, the user plane path of the SCG bearer remains unchanged before and after the MeNB handover.
  • Step 508 The target base station sends a UE context release message UE CONTEXT to the first base station. RELEASE.
  • Step 509 The first base station sends a SeNB release request to the second base station, indicating that the second base station releases the X2 connection related to the UE between the first base station and the first base station.
  • the SeNB release request may be sent through an X2 control plane message (such as a SENB RELEASE REQUEST) defined in an existing standard, or a new message may be defined to indicate that the second base station releases and the X2 connection associated with the UE between the first base station. .
  • an X2 control plane message such as a SENB RELEASE REQUEST
  • a new message may be defined to indicate that the second base station releases and the X2 connection associated with the UE between the first base station.
  • the release of the X2 connection related to the UE does not affect the second base station's user plane data scheduling and resource configuration related to the UE, and does not affect the second base station related to the UE.
  • Context
  • the method for transmitting data in base station handover enables the UE to maintain a connection with the second base station before and after the MeNB handover and to correspond to the SCG bearer reserved for transmission at the second base station.
  • the protocol entity remains unchanged, and the UE and the second base station can continue to perform user plane data scheduling on the SCG bearer, thereby improving the data transmission performance and throughput of the UE; meanwhile, the data transmission between the second base station and the UE is not affected by the MeNB.
  • the impact of switching thereby improving the efficiency of wireless resource usage throughout the network.
  • the disclosed method for transmitting data in base station handover includes the following steps:
  • Step 601 In the handover preparation phase, determine that an intra-base station handover needs to be performed
  • the UE is configured with two bearers, that is, an MCG bearer established with the first base station and an SCG bearer established with the second base station;
  • the first base station determines to perform intra-base station handover according to parameters such as radio signal quality and load, and keeps the second base station cell and resource configuration unchanged; or, according to the configuration parameter change of the UE, determines an execution base. Switch within the station and update the resource configuration information.
  • Step 602 The first base station sends an RRC CR message to the UE.
  • the RRC CR message carries the updated new resource configuration information, and carries the referenced Showing that the UE maintains a connection with the second base station and information that is unchanged from the protocol entity corresponding to the SCG bearer transmitted by the second base station;
  • the information carried by the RRC CR message indicating that the UE maintains the connection with the second base station and the protocol entity corresponding to the SCG bearer remaining in the second base station transmission may not include the existing mobility control information Mobility Control Info.
  • Step 603 The UE keeps the connection with the second base station according to the RRC CR message and the protocol entity corresponding to the SCG bearer reserved in the second base station unchanged;
  • the downlink/uplink data tunnel endpoint of the SCG bearer is kept unchanged, and the UE and the second base station continue to perform user plane data scheduling on the SCG bearer.
  • Steps 604 to 606 described below may be performed simultaneously with this step or separately.
  • Step 604 The UE resynchronizes with the first base station cell, and initiates random access to the first base station.
  • the protocol entity corresponding to the MCG bearer is reconstructed or reset according to the updated new resource configuration information.
  • Step 605 The UE sends an RRC CRC message to the first base station, indicating that the resource configuration of the updated UE in the first base station is enabled.
  • Step 606 The first base station sends an MeNB intra-base station handover notification message to the second base station.
  • This step is used to notify the second base station that the MeNB has performed or is performing intra-base station handover, and may be performed after any one of steps 601-605.
  • the method for transmitting data in handover in a base station enables the UE to maintain a connection with the second base station before and after the MeNB handover and to correspond to the SCG bearer reserved for transmission at the second base station.
  • the protocol entity remains unchanged, and the UE and the second base station can continue to perform user plane data scheduling on the SCG bearer, thereby improving the data transmission performance and throughput of the UE; meanwhile, the data transmission between the second base station and the UE is not affected by the MeNB.
  • the impact of switching thereby improving the efficiency of wireless resource usage throughout the network.
  • the disclosed method for transmitting data in a base station handover includes the following steps:
  • Step 701 In the handover preparation phase, determine that an inter-base station handover needs to be performed
  • the UE is configured with three bearers, EPS bearer #1 and EPS bearer #2 belong to MCG bearer, and EPS bearer #3 belongs to SCG bearer;
  • the first base station sends a handover request message to the target base station, where the handover request message carries resource configuration information of the UE on the source network side, and the target base station determines, according to the resource configuration information, whether to accept handover between the base stations and the UE and the first The connection status between the two base stations;
  • the target base station After the target base station determines to perform inter-base station handover, it sends a handover request acknowledgement message to the first base station, where the handover request acknowledgement message carries new resource configuration information.
  • Step 702 The first base station sends an RRC CR message to the UE, instructing the UE to switch the MeNB from the first base station to the target base station.
  • the RRC CR message carries, in addition to the new resource configuration information, information indicating that the UE maintains a connection with the second base station and reconstructs the EPS bearer #2 as an SCG bearer;
  • the information carried by the RRC CR message indicating that the UE maintains the connection with the second base station and reconstructs the EPS bearer #2 into the SCG bearer may not include the existing mobility control information Mobility Control Info.
  • Step 703 The first base station sends an SeNB release request to the second base station, instructing the second base station to establish an EPS bearer #2 as an SCG bearer.
  • the protocol entity corresponding to EPS bearer #2 is reconstructed according to the new resource configuration.
  • Steps 704 to 711 described below may be performed simultaneously with this step or separately.
  • Step 704 The UE keeps the protocol entity corresponding to the SCG bearer transmitted in the second base station unchanged according to the RRC CR message;
  • the UE may further perform the second resource to the second base according to the new resource configuration information in the RRC CR message.
  • the station cell initiates random access
  • the protocol entity corresponding to the EPS bearer #3 remains unchanged.
  • the second base station may continue to perform scheduling of user plane data transmission by the UE through EPS bearer #2 and EPS bearer #3.
  • Step 705 The UE initiates random access to the target base station.
  • the UE leaves the first base station cell, synchronizes with the target base station cell, and initiates random access to the target base station.
  • the protocol entity corresponding to EPS bearer #1 performs reconstruction/reset according to the new resource configuration information.
  • Step 706 The UE sends an RRC CRC message to the target base station, indicating that the UE has enabled new resource configuration.
  • the target base station may perform the user plane transmission scheduling directly to the UE.
  • Step 707 The first base station forwards the number information and the data packet of the EPS bearer#1 data packet to the target base station according to the handover request acknowledgement message.
  • the number information and the data packet of the EPS bearer #2 data packet can also be forwarded to the second base station, so that step 708 does not have to be performed;
  • the second base station may schedule the UE to transmit the data packets of EPS bearer #2 and EPS bearer #3 after receiving the data packet.
  • Step 708 After receiving the data packet forwarded by the first base station, the target base station may further forward the corresponding data packet to the second base station.
  • Step 709 The target base station sends a path switching indication message to the core network node (including the MME and the S-GW), indicating the change of the downlink/uplink data tunnel endpoint of the MCG bearer and the SCG bearer added by the second base station.
  • the core network node including the MME and the S-GW
  • the downlink data tunnel endpoint of the EPS bearer #1 is switched from the first base station to the target base station.
  • the downlink data tunnel endpoint of EPS bearer #2 is switched from the first base station to the second base station; the path switch does not include the conversion of the S1 data tunnel endpoint that remains in the EPS bearer #3 transmitted by the second base station, that is, the user of EPS bearer #3
  • the face path remains unchanged before and after the MeNB switch.
  • Step 710 The target base station sends a UE context release message UE CONTEXT RELEASE to the first base station.
  • Step 711 The first base station sends an SeNB release request to the second base station, indicating that the second base station releases the X2 connection related to the UE between the first base station and the first base station.
  • the SeNB release request may be sent through an X2 control plane message (such as a SENB RELEASE REQUEST) defined in an existing standard, or a new message may be defined to indicate that the second base station releases and the X2 connection associated with the UE between the first base station. .
  • an X2 control plane message such as a SENB RELEASE REQUEST
  • a new message may be defined to indicate that the second base station releases and the X2 connection associated with the UE between the first base station.
  • the release of the X2 connection related to the UE does not affect the second base station's user plane data scheduling and resource configuration related to the UE, and does not affect the second base station related to the UE.
  • Context
  • the method for transmitting data in base station handover as shown in the embodiment of the present invention, as shown in FIG. 7, enables the UE to maintain a connection with the second base station before and after the MeNB handover and to correspond to the SCG bearer reserved for transmission at the second base station.
  • the protocol entity is unchanged, that is, the user plane path of the EPS bearer #3 remains unchanged before and after the MeNB handover, thereby improving the data transmission performance and throughput of the UE; meanwhile, the data transmission between the second base station and the UE is not affected by the MeNB.
  • the impact of switching thereby improving the efficiency of wireless resource usage throughout the network.
  • the disclosed UE for transmitting data in a base station handover includes: a receiving module, a switching module, and a first protocol processing, where
  • the receiving module is configured to receive a radio resource control connection reconfiguration RRC CR message
  • the switching module is configured to switch the primary base station MeNB from the first base station to the target base station;
  • the first protocol processing module is configured to maintain a connection with the second base station and a protocol entity corresponding to the secondary base station cell group carrying the SCG bearer remaining in the second base station transmission.
  • the first protocol processing module is further configured to re-establish or reset a protocol entity corresponding to the primary base station cell group carrying the MCG bearer; the switching module is further configured to leave the first base station cell and synchronize with the target base station cell, to the The target base station initiates random access;
  • the first protocol processing module is further configured to reconstruct or reset a protocol entity corresponding to the primary base station cell group bearer MCG bearer;
  • a transmission module is further configured to synchronize with the first base station cell and initiate random access to the first base station.
  • the first protocol processing module is further configured to add or delete the SCG bearer while maintaining the connection with the second base station and the protocol entity corresponding to the SCG bearer remaining in the second base station transmission, and The protocol entity corresponding to the SCG bearer is reconstructed or reset, or deleted.
  • the UE further includes a first transmission module configured to perform user plane data transmission on the SCG bearer reserved for transmission by the second base station.
  • the disclosed method for transmitting data in a base station handover includes the following steps:
  • Step 901 In the handover preparation phase, determining to switch the MeNB from the first base station to the target base station;
  • Step 902 When the primary base station MeNB is switched from the first base station to the target base station, the second base station keeps the connection with the UE and the protocol entity corresponding to the secondary base station cell group bearer SCG bearer transmitted by the second base station unchanged. User plane data scheduling is performed on the SCG bearer reserved for transmission at the second base station.
  • the base station for transmitting data in a base station handover includes: a second protocol processing module and a second transmission module, where
  • the second protocol processing module is configured to maintain a connection with the UE and a protocol corresponding to the secondary base station cell group carrying the SCG bearer transmitted by the second base station when the primary base station MeNB is switched from the first base station to the target base station. The entity remains unchanged;
  • the second transmission module is configured to perform user plane data scheduling on the SCG bearer reserved in the second base station transmission.
  • the foregoing second protocol processing module may be further configured to send a secondary base station SeNB release request to the second base station, indicating that the second base station releases the X2 connection related to the UE between the first base station and the UE is related to the UE.
  • the release of the X2 connection does not affect the user plane data scheduling and resource configuration associated with the UE by the second base station, nor does it affect the context related to the UE saved on the second base station.
  • the foregoing second protocol processing module may be further configured to send an MeNB intra-base station handover notification message to the second base station, to notify the second base station that the MeNB performs or performs intra-base station handover.
  • the embodiment of the invention further describes a storage medium in which a computer program is stored, the computer program being configured to perform the method for transmitting data in base station handover in the foregoing embodiments.
  • the connection between the UE and the second base station and the protocol entity corresponding to the secondary base station cell group carrying SCG bearer transmitted by the second base station remain unchanged;
  • the UE can maintain the connection with the second base station before and after the MeNB handover, that is, the UE and the second base station can continuously transmit data, thereby improving the data transmission performance and throughput of the UE; meanwhile, the second base station The data transmission with the UE is not affected by the MeNB handover, thereby improving the radio resource usage efficiency of the entire network.

Abstract

本发明公开了一种用于基站切换中传输数据的方法，包括：用户设备UE根据接收的无线资源控制连接重配置RRC CR消息将主基站MeNB由第一基站切换为目标基站；同时，UE保持与第二基站之间的连接及与保留在第二基站传输的次基站小区组承载SCG bearer对应的协议实体不变。本发明同时还公开了另一种用于基站切换中传输数据的方法、用户设备和基站、存储介质。

Description

用于基站切换中传输数据的方法、用户设备和基站、存储介质 技术领域
本发明涉及移动通信中的基站切换技术，尤其涉及一种用于基站切换中传输数据的方法、用户设备和基站、存储介质。
背景技术
第三代伙伴组织计划(Third Generation Partnership Projects，3GPP)认为，小小区的部署及其能力方面的提高是未来通信网络发展中的重要课题之一；这里，所述小小区是指由低功率基站建立的小区，区别于宏基站建立的小区Macro Cell，小小区通常可称为Small Cell。目前，通信业界普遍认同的一种异构网络部署场景是，在宏基站的覆盖范围内或边界处部署低功率节点，由宏基站和低功率节点共同组成演进的通用陆地无线接入网(Evolved Universal Terrestrial Radio Access Network，E-UTRAN)系统中的接入网(Radio Access Network，RAN)，从而为用户设备(User Equipment，UE)提供联合的数据传输服务。
图1为这种典型异构网络部署场景下的系统架构示意图，如图1所示，在RAN中，与核心网(Core Network，CN)中的移动性管理实体(Mobility Management Entity，MME)建有S1-MME接口、并被CN视作移动锚点的基站，称为主基站(Master eNB，MeNB)；与MeNB间以X2接口相连、为UE提供额外的无线资源的节点，称为次基站(Secondary eNB，SeNB)。UE与MeNB、SeNB间均建有无线Uu口，可以在Uu口上传输控制面信令和用户面数据，这种情况下，认为UE处于双连接态(Dual Connectivity，DC)。这种系统架构使得两个(甚至多个)基站可以同时为一个UE提供无线资源并同时进行通讯服务，因此，网络的数据吞吐量得到了极大的提升， 可以尽力满足用户日益增长的对数据速率的需求。
图2为这种典型的异构网络部署场景下的用户面传输模式及协议栈示意图，如图2所示，以下行数据为例，在用户面上，分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)子层收到来自上层的IP数据分组后，可以对IP数据分组进行头压缩和加密，然后发送到无线链路控制协议(Radio Link Control，RLC)子层，之后发送到媒体接入控制层MAC和物理层PHY。
以下行数据为例，演进分组系统承载(Evolved Packet System，EPS)bearer#1的传输模式与单链接系统的标准模式相同，即由服务网关(Serving Gateway，S-GW)通过S1-U接口将数据包发送给MeNB，再由MeNB通过Uu口将数据包发送给UE；在DC中，这种无线协议栈仅位于MeNB且仅使用MeNB资源的承载，称为主基站小区组承载(Master Cell Group bearer，MCG bearer)。EPS bearer#2的传输是在由S-GW通过与SeNB间的S1-U接口将数据包发送给SeNB，再由SeNB通过Uu口将数据包发送给UE；这种无线协议栈完整的位于SeNB且仅使用SeNB资源的承载，称为次基站小区组承载(Secondary Cell Group bearer，SCG bearer)。
在UE进行数据传输和/或移动的过程中会存在两种场景：一是例如当某协议实体中的变量累计到一定的门限时，所述UE的某些配置参数需要进行修改；二是例如当无线信号质量下降到一定门限或当前服务基站的负荷过重时，所述UE的服务基站需要从当前连接的eNB(称为源基站，source eNB)切换至另一个条件合适的eNB(称为目标基站，target eNB)。这两种场景需要通过基站内切换(intra-eNB handover，切换前后UE仍与同一eNB建立连接，仅某些参数进行了重配)或基站间切换(inter-eNB handover，切换前后UE与不同eNB建立连接)的程序来实现。
在上述系统架构下，当处于DC态的UE的MeNB需要进行切换时， 依据现有技术，UE的SeNB会在切换程序前或切换程序过程中被释放掉。进一步的，如果在所述UE接入target eNB后(对于intra-eNB handover，target eNB就是原MeNB)仍存在业务需求及条件适合的基站节点，那么，target eNB会为所述UE再添加SeNB。优选的，对于intra-eNB handover来讲，如果原SeNB的条件一直满足特定门限，那么MeNB可以在一条控制面信令中同时携带MeNB的Intra-MeNB handover信息和所述SeNB的释放与再添加信息，即仅通过一条空口控制面信令来指示UE对两个eNB的资源进行重配置。
可见，在网络现有的设计能力下，UE与SeNB间的用户面数据传输会因为UE的MeNB切换而中断。即使在优选的Intra-MeNB handover程序中，如果UE接入target eNB小区所花费的时间较长，那么，UE与SeNB间的用户面数据中断时间也会随之加长；这就意味着网络能够为UE提供的无线资源被空置，即UE原本可以被提升的数据吞吐量因故受限，进而网络的整体服务性能也会下降。
发明内容
为解决现有存在的技术问题，本发明实施例期望提供一种用于基站切换中传输数据的方法、用户设备和基站、存储介质。
本发明实施例的技术方案是这样实现的：
本发明实施例提供的一种用于基站切换中传输数据的方法，包括：
用户设备UE根据接收的无线资源控制连接重配置RRC CR消息将主基站MeNB由第一基站切换为目标基站；
且所述UE保持与第二基站之间的连接及与保留在第二基站传输的次基站小区组承载SCG bearer对应的协议实体不变。
在所述UE保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变的同时，所述方法还包括：
所述UE离开第一基站小区，与目标基站小区进行同步，向所述目标基站发起随机接入，并对与主基站小区组承载MCG bearer对应的协议实体进行重建或复位；
或者，当所述目标基站与所述第一基站为同一个基站时，所述UE与第一基站小区进行同步，向所述第一基站发起随机接入，并对与主基站小区组承载MCG bearer对应的协议实体进行重建或复位。
上述UE在保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变的同时增加或删减SCG bearer，并对与所述SCG bearer对应的协议实体进行重建或复位、或删除。
上述UE在所述保留在第二基站传输的SCG bearer上进行用户面数据传输。
本发明实施例提供的一种UE，包括：接收模块、切换模块和第一协议处理模块，其中，
所述接收模块，配置为接收无线资源控制连接重配置RRC CR消息；
所述切换模块，配置为将主基站MeNB由第一基站切换为目标基站；
所述第一协议处理模块，配置为保持与第二基站之间的连接及与保留在第二基站传输的次基站小区组承载SCG bearer对应的协议实体不变。
在保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变的同时，
所述第一协议处理模块还配置为对与主基站小区组承载MCG bearer对应的协议实体进行重建或复位；所述切换模块还配置为离开第一基站小区，与目标基站小区进行同步，向所述目标基站发起随机接入；
或者，当所述目标基站与所述第一基站为同一个基站时，所述第一协议处理模块还配置为对与主基站小区组承载MCG bearer对应的协议实体进行重建或复位；所述切换模块还用与第一基站小区进行同步，于向所述第 一基站发起随机接入。
上述第一协议处理模块还配置为在保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变的同时增加或删减SCG bearer，并对与所述SCG bearer对应的协议实体进行重建或复位、或删除。
上述UE还包括第一传输模块，配置为在所述保留在第二基站传输的SCG bearer上进行用户面数据传输。
本发明实施例提供的一种用于基站切换中传输数据的方法，包括：
第二基站在主基站MeNB由第一基站切换为目标基站时，保持与UE之间的连接及与保留在第二基站传输的次基站小区组承载SCG bearer对应的协议实体不变，在所述保留在第二基站传输的SCG bearer上进行用户面数据调度。
上述方法还包括：所述第一基站向所述第二基站发送次基站SeNB释放请求，指示第二基站释放和第一基站之间与所述UE相关的X2连接，使与所述UE相关的X2连接的释放，既不影响所述第二基站对与所述UE相关的用户面数据调度及资源配置，也不影响所述第二基站上保存的与所述UE相关的上下文。
上述方法还包括：所述第一基站向所述第二基站发送MeNB基站内切换通知消息，向所述第二基站通知MeNB进行了或正在进行基站内切换。
本发明实施例提供的一种基站，包括：第二协议处理模块和第二传输模块，其中，
所述第二协议处理模块，配置为在主基站MeNB由第一基站切换为目标基站时，保持与UE之间的连接及与保留在第二基站传输的次基站小区组承载SCG bearer对应的协议实体不变；
所述第二传输模块，配置为在所述保留在第二基站传输的SCG bearer 上进行用户面数据调度。
上述第二协议处理模块还配置为向所述第二基站发送次基站SeNB释放请求，指示第二基站释放和第一基站之间与所述UE相关的X2连接，使与所述UE相关的X2连接的释放，既不影响所述第二基站对与所述UE相关的用户面数据调度及资源配置，也不影响所述第二基站上保存的与所述UE相关的上下文。
上述第二协议处理模块还配置为向所述第二基站发送MeNB基站内切换通知消息，向所述第二基站通知MeNB进行了或正在进行基站内切换。
一种存储介质，所述存储介质中存储有计算机程序，所述计算机程序配置为执行前述的用于基站切换中传输数据的方法。
本发明实施例提供的用于基站切换中传输数据的方法、用户设备和基站、存储介质，通过在主基站MeNB由第一基站切换为目标基站时，UE与第二基站之间的连接及与保留在第二基站传输的次基站小区组承载SCG bearer对应的协议实体保持不变；如此，使UE能够在MeNB切换前后保持与第二基站之间的连接，即UE与第二基站之间可以不间断地传输数据，从而提升UE的数据传输性能和吞吐量；同时，第二基站与UE之间的数据传输不受MeNB切换的影响，从而提高整个网络的无线资源使用效率。
附图说明
图1为典型的异构网络部署场景下的系统架构示意图；
图2为典型的异构网络部署场景下的用户面传输模式及协议栈示意图；
图3为本发明实施例提供的用于基站切换中传输数据的方法的切换场景示意图；
图4为本发明一实施例提供的用于基站切换中传输数据的方法流程示意图一；
图5为本发明一实施例提供的用于基站切换中传输数据的方法流程示 意图二；
图6为本发明一实施例提供的用于基站切换中传输数据的方法流程示意图三；
图7为本发明一实施例提供的用于基站切换中传输数据的方法流程示意图四；
图8为本发明实施例提供的用于基站切换中传输数据的UE的结构示意图；
图9为本发明另一实施例提供的用于基站切换中传输数据的方法流程示意图；
图10为本发明实施例提供的用于基站切换中传输数据的基站的结构示意图。
具体实施方式
图3为本发明实施例提供的用于基站切换中传输数据的方法的切换场景示意图，在该场景下，UE与接入网中的第一基站和第二基站都建立有无线连接，并且第一基站与第二基站之间建立有接口，该接口可以是X2口。
UE与第一基站之间可以传输控制面信令和用户面数据，第一基站与核心网对应的节点之间可以传输控制面信令和用户面数据，此时，第一基站相当于MeNB，其中，主基站MeNB是指在双连接中的一种基站角色/地位，在切换前，第一基站是主基站(MeNB)、也是切换中的源基站(source MeNB)，在切换后，目标基站是主基站(MeNB)、也是切换中的目标基站(target MeNB)；UE与第二基站之间至少可以传输用户面数据，第二基站与核心网中的服务网关之间可以传输用户面数据，此时，第二基站相当于SeNB，同样地，次基站SeNB也是是指在双连接中的一种基站角色/地位。
在本发明实施例提供的其它场景下，第一基站和第二基站的数量可以分别大于一，即UE可以同时接入多个基站；并且，第一基站和第二基站可 以是各种类型的基站，例如低功率基站和/或宏基站。
在本发明提供的一个实施例中，UE在移动的过程中与第一基站(在移动场景中也可以称其为源基站)的服务小区(称为第一基站小区)间信号质量下降、与目标基站小区间信号质量上升；同时，UE始终处于第二基站的覆盖范围内，即UE与第二基站小区之间的信号质量保持良好。确定将相当于MeNB角色的基站节点由第一基站切换为目标基站后，UE离开第一基站小区，接入目标基站小区。在MeNB由第一基站切换为目标基站的过程中，UE保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变，因此，UE与第二基站之间的用户面数据传输不会中断，即UE与第二基站之间可以不间断地传输数据，从而有效地提升了UE传输数据的性能和吞吐量，并提高了整个网络的无线资源使用效率。
其中，所述对协议实体指的是承载在节点中的完整无线协议栈，如图2所示，包括PDCP子层、RLC子层、MAC子层和物理层。保持协议实体不变指的是保持协议实体的RRC资源配置不变、且不需要实体进行重建或复位。
下面通过具体实施例结合附图对本发明做进一步的详细说明。
在如图4所示的本发明一个实施例中，所公开的用于基站切换中传输数据的方法包括以下步骤：
步骤401：确定将主基站MeNB由第一基站切换为目标基站；
本步骤中，第一基站可以向目标基站发送切换请求消息，所述切换请求消息携带有所述UE在源网络侧的资源配置信息；目标基站根据所述资源配置信息确定接纳UE的接入、决定UE与第二基站间的连接状况及承载级资源配置，并向所述第一基站发送切换请求确认消息；
本步骤中，第一基站也可以根据无线信号质量等参数确定执行基站内切换并保持第二基站小区及资源配置不变；或者，根据UE的配置参数变化 情况确定执行基站内切换；此时，目标基站与第一基站为同一个基站，由第一基站更新资源配置信息。
步骤402：第一基站向UE发送无线资源控制连接重配置(Radio Resource Control Connection Reconfiguration，RRC CR)消息；
其中，RRC CR消息除携带有新资源配置信息外，还携带有指示UE保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变的信息。
步骤403：UE根据接收的RRC CR消息将主基站MeNB由第一基站切换为目标基站；同时，UE保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变；
其中，UE离开第一基站小区，与目标基站小区进行同步，向目标基站发起随机接入，对与MCG bearer对应的协议实体进行重建或复位；
或者，当目标基站与第一基站为同一个基站时，UE与第一基站小区进行同步，向第一基站发起随机接入，对与MeNB资源的承载MCG bearer对应的协议实体进行重建或复位。
本步骤中，保持SCG bearer的下行/上行数据隧道端点不变，UE和第二基站继续可以在SCG bearer上进行用户面数据调度；也可以在保持与SeNB之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变的同时增加或删减SCG bearer，并对与所述SCG bearer对应的协议实体进行重建或复位、或删除，UE和第二基站继续可以在保留在第二基站传输的SCG bearer和/或增加的SCG bearer上进行用户面数据调度。
UE还可以向目标基站发送无线资源控制连接重配置完成(RRC Connection Reconfiguration Complete，RRC CRC)消息，指示UE已启用新资源配置。
目标基站收到RRC CRC消息后，目标基站可以进一步向核心网节点发 送路径转换指示消息，指示目标基站承担的MCG bearer和第二基站新增的SCG bearer的下行/上行数据隧道端点的变化。
通过如图4所示本发明实施例提供的用于基站切换中传输数据的方法，使UE能够在MeNB切换前后保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变，UE和第二基站继续可以在SCG bearer上进行用户面数据调度，从而提升了UE的数据传输性能和吞吐量；同时，第二基站与UE之间的数据传输不受MeNB切换的影响，从而提高了整个网络的无线资源使用效率。
在如图5所示的本发明一个实施例中，所公开的用于基站切换中传输数据的方法包括以下步骤：
步骤501：在切换准备阶段，确定需执行基站间切换；
本实施例中，UE配置有两个承载，即：与第一基站建立的MCG bearer和与第二基站建立的SCG bearer；
其中，第一基站向目标基站发送切换请求消息，所述切换请求消息携带有所述UE在源网络侧的资源配置信息；
目标基站根据所述资源配置信息判断是否接纳基站间切换及UE与第二基站间的连接状况；
目标基站确定执行基站间切换后，向第一基站发送切换请求确认消息，所述切换请求确认消息携带有新资源配置信息。
步骤502：第一基站向UE发送RRC CR消息，指示UE将MeNB由所述第一基站切换为目标基站；
其中，RRC CR消息除携带有新资源配置信息外，还携带有指示UE保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变的信息；
进一步地，RRC CR消息携带的指示UE保持与第二基站之间的连接及 与保留在第二基站传输的SCG bearer对应的协议实体不变的信息可以不包括现有的移动性控制信息Mobility Control Info。
步骤503：UE根据RRC CR消息保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变；
本步骤中，保持SCG bearer的下行/上行数据隧道端点不变，UE和第二基站继续可以在SCG bearer上进行用户面数据调度。
下述步骤504至步骤509，既可以与本步骤同时实施，也可以分别实施。
步骤504：UE向目标基站发起随机接入；
其中，UE离开第一基站小区，与目标基站小区进行同步，向目标基站发起随机接入；
本步骤中，与MCG bearer对应的协议实体按照新资源配置信息进行重建或复位。
步骤505：UE向目标基站发送RRC CRC消息，指示UE已启用新资源配置；
目标基站收到RRC CRC消息后可以直接对UE进行用户面的传输调度。
步骤506：第一基站根据切换请求确认消息，将MCG bearer数据包的编号信息及数据包转发给目标基站。
步骤507：目标基站向核心网节点(包括MME和S-GW)发送路径转换指示消息，指示目标基站承担的MCG bearer的下行/上行数据隧道端点的变化；
其中，路径转换不包括仍保留在第二基站传输的SCG bearer的下行/上行数据隧道端点的转换，即SCG bearer的用户面路径在MeNB切换前后保持不变。
步骤508：目标基站向第一基站发送UE上下文释放消息UE CONTEXT  RELEASE。
步骤509：第一基站向第二基站发送SeNB释放请求，指示第二基站释放和第一基站之间与该UE相关的X2连接；
其中，SeNB释放请求可以通过现有标准中定义的X2控制面消息(如SENB RELEASE REQUEST)发送，也可以定义一条新的消息指示第二基站释放和第一基站之间与该UE相关的X2连接。
本步骤中，与该UE相关的X2连接的释放，既不会影响第二基站对与该UE相关的用户面数据调度及资源配置，也不会影响第二基站上保存的与该UE相关的上下文。
通过如图5所示本发明实施例提供的用于基站切换中传输数据的方法，使UE能够在MeNB切换前后保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变，UE和第二基站继续可以在SCG bearer上进行用户面数据调度，从而提升了UE的数据传输性能和吞吐量；同时，第二基站与UE之间的数据传输不受MeNB切换的影响，从而提高了整个网络的无线资源使用效率。
在如图6所示的本发明一个实施例中，所公开的用于基站切换中传输数据的方法包括以下步骤：
步骤601：在切换准备阶段，确定需执行基站内切换；
本实施例中，UE配置有两个承载，即：与第一基站建立的MCG bearer和与第二基站建立的SCG bearer；
本步骤中，第一基站(也即目标基站)根据无线信号质量、负荷等参数确定执行基站内切换并保持第二基站小区及资源配置不变；或者，根据UE的配置参数变化情况确定执行基站内切换，并更新资源配置信息。
步骤602：第一基站向UE发送RRC CR消息；
其中，RRC CR消息除携带有更新后的新资源配置信息外，还携带有指 示UE保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变的信息；
进一步地，RRC CR消息携带的指示UE保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变的信息可以不包括现有的移动性控制信息Mobility Control Info。
步骤603：UE根据RRC CR消息保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变；
本步骤中，保持SCG bearer的下行/上行数据隧道端点不变，UE和第二基站继续可以在SCG bearer上进行用户面数据调度。
下述步骤604至步骤606，既可以与本步骤同时实施，也可以分别实施。
步骤604：UE与第一基站小区进行重新同步，并向第一基站发起随机接入；
本步骤中，与MCG bearer对应的协议实体按照更新后的新资源配置信息进行重建或复位。
步骤605：UE向第一基站发送RRC CRC消息，指示已启用更新后的UE在第一基站的资源配置。
步骤606：第一基站向第二基站发送MeNB基站内切换通知消息；
本步骤用于向第二基站通知MeNB进行了或正在进行基站内切换，可以在步骤601-605任意一个步骤之后执行。
通过如图6所示本发明实施例提供的在基站内切换中传输数据的方法，使UE能够在MeNB切换前后保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变，UE和第二基站继续可以在SCG bearer上进行用户面数据调度，从而提升了UE的数据传输性能和吞吐量；同时，第二基站与UE之间的数据传输不受MeNB切换的影响，从而提高了整个网络的无线资源使用效率。
在如图7所示的本发明一个实施例中，所公开的用于基站切换中传输数据的方法包括以下步骤：
步骤701：在切换准备阶段，确定需执行基站间切换；
本实施例中，UE配置有三个承载，EPS bearer#1和EPS bearer#2属于MCG bearer，EPS bearer#3属于SCG bearer；
其中，第一基站向目标基站发送切换请求消息，所述切换请求消息携带有所述UE在源网络侧的资源配置信息；目标基站根据所述资源配置信息判断是否接纳基站间切换及UE与第二基站间的连接状况；
目标基站确定执行基站间切换后，向第一基站发送切换请求确认消息，所述切换请求确认消息携带有新资源配置信息。
步骤702：第一基站向UE发送RRC CR消息，指示UE将MeNB由第一基站切换为目标基站；
其中，RRC CR消息除携带有新资源配置信息外，还携带有指示UE保持与第二基站之间的连接并将EPS bearer#2重建为SCG bearer的信息；
进一步地，RRC CR消息携带的指示UE保持与第二基站之间的连接并将EPS bearer#2重建为SCG bearer的信息可以不包括现有的移动性控制信息Mobility Control Info。
步骤703：第一基站向第二基站发送SeNB释放请求，指示第二基站建立EPS bearer#2为SCG bearer；
本步骤中，对与EPS bearer#2对应的协议实体按照新资源配置进行重建。
下述步骤704至步骤711，既可以与本步骤同时实施，也可以分别实施。
步骤704：UE根据RRC CR消息保持与保留在第二基站传输的SCG bearer对应的协议实体不变；
其中，UE可以进一步根据RRC CR消息中的新资源配置信息向第二基 站小区发起随机接入；
其中，与EPS bearer#3对应的协议实体保持不变，在随机接入完成后，第二基站可以继续对UE通过EPS bearer#2和EPS bearer#3进行用户面数据传输的调度。
步骤705：UE向目标基站发起随机接入；
其中，UE离开第一基站小区，与目标基站小区进行同步，向目标基站发起随机接入；
本步骤中，与EPS bearer#1对应的协议实体按照新资源配置信息进行重建/复位。
步骤706：UE向目标基站发送RRC CRC消息，指示UE已启用新资源配置；
本步骤中，目标基站收到RRC CRC消息后可以直接对UE进行用户面的传输调度。
步骤707：第一基站根据切换请求确认消息，将EPS bearer#1数据包的编号信息及数据包转发给目标基站；
其中，也可以将EPS bearer#2数据包的编号信息及数据包转发给第二基站，如此则不必执行步骤708；
进一步地，第二基站在收到数据包后可调度UE传输EPS bearer#2和EPS bearer#3的数据包。
步骤708：目标基站收到第一基站转发的数据包后可以进一步向第二基站转发相应的数据包。
步骤709：目标基站向核心网节点(包括MME和S-GW)发送路径转换指示消息，指示目标基站承担的MCG bearer和第二基站新增的SCG bearer的下行/上行数据隧道端点的变化；
其中，EPS bearer#1的下行数据隧道端点由第一基站转换到目标基站， EPS bearer#2的下行数据隧道端点由第一基站转换到第二基站；路径转换不包括仍保留在第二基站传输的EPS bearer#3的S1数据隧道端点的转换，即EPS bearer#3的用户面路径在MeNB切换前后保持不变。
步骤710：目标基站向第一基站发送UE上下文释放消息UE CONTEXT RELEASE。
步骤711：第一基站向第二基站发送SeNB释放请求，指示第二基站释放和第一基站之间与该UE相关的X2连接；
其中，SeNB释放请求可以通过现有标准中定义的X2控制面消息(如SENB RELEASE REQUEST)发送，也可以定义一条新的消息指示第二基站释放和第一基站之间与该UE相关的X2连接。
本步骤中，与该UE相关的X2连接的释放，既不会影响第二基站对与该UE相关的用户面数据调度及资源配置，也不会影响第二基站上保存的与该UE相关的上下文。
通过如图7所示本发明实施例提供的用于基站切换中传输数据的方法，使UE能够在MeNB切换前后保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变，即EPS bearer#3的用户面路径在MeNB切换前后保持不变，从而提升了UE的数据传输性能和吞吐量；同时，第二基站与UE之间的数据传输不受MeNB切换的影响，从而提高了整个网络的无线资源使用效率。
在如图8所示的本发明一个实施例中，所公开的用于基站切换中传输数据的UE包括：接收模块、切换模块和第一协议处理，其中，
所述接收模块，配置为接收无线资源控制连接重配置RRC CR消息；
所述切换模块，配置为将主基站MeNB由第一基站切换为目标基站；
所述第一协议处理模块，配置为保持与第二基站之间的连接及与保留在第二基站传输的次基站小区组承载SCG bearer对应的协议实体不变。
在保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变的同时，
上述第一协议处理模块还配置为对与主基站小区组承载MCG bearer对应的协议实体进行重建或复位；所述切换模块还配置为离开第一基站小区，与目标基站小区进行同步，向所述目标基站发起随机接入；
或者，当所述目标基站与所述第一基站为同一个基站时，所述第一协议处理模块还配置为对与主基站小区组承载MCG bearer对应的协议实体进行重建或复位；所述第一传输模块还配置为与第一基站小区进行同步，向所述第一基站发起随机接入。
上述第一协议处理模块还配置为在保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变的同时增加或删减SCG bearer，并对与所述SCG bearer对应的协议实体进行重建或复位、或删除。
上述UE还包括第一传输模块，配置为在所述保留在第二基站传输的SCG bearer进行上用户面数据传输。
在如图9所示的本发明一个实施例中，所公开的用于基站切换中传输数据的方法包括以下步骤：
步骤901：在切换准备阶段，确定将MeNB由第一基站切换为目标基站；
步骤902：第二基站在主基站MeNB由第一基站切换为目标基站时，保持与UE之间的连接及与保留在第二基站传输的次基站小区组承载SCG bearer对应的协议实体不变，在所述保留在第二基站传输的SCG bearer进行用户面数据调度。
在如图10所示的本发明一个实施例中，所公开的用于基站切换中传输数据的基站包括：第二协议处理模块和第二传输模块，其中，
所述第二协议处理模块，配置为在主基站MeNB由第一基站切换为目标基站时，保持与UE之间的连接及与保留在第二基站传输的次基站小区组承载SCG bearer对应的协议实体不变；
所述第二传输模块，配置为在所述保留在第二基站传输的SCG bearer进行用户面数据调度。
上述第二协议处理模块还可以配置为向所述第二基站发送次基站SeNB释放请求，指示第二基站释放和第一基站之间与所述UE相关的X2连接，使与所述UE相关的X2连接的释放，既不影响所述第二基站对与所述UE相关的用户面数据调度及资源配置，也不影响所述第二基站上保存的与所述UE相关的上下文。
上述第二协议处理模块还可以用于向所述第二基站发送MeNB基站内切换通知消息，向所述第二基站通知MeNB进行了或正在进行基站内切换。
本发明实施例还记载了一种存储介质，所述存储介质中存储有计算机程序，所述计算机程序配置为执行前述各实施例的用于基站切换中传输数据的方法。
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。
工业实用性
本发明通过在主基站MeNB由第一基站切换为目标基站时，UE与第二基站之间的连接及与保留在第二基站传输的次基站小区组承载SCG bearer对应的协议实体保持不变；如此，使UE能够在MeNB切换前后保持与第二基站之间的连接，即UE与第二基站之间可以不间断地传输数据，从而提升UE的数据传输性能和吞吐量；同时，第二基站与UE之间的数据传输不受MeNB切换的影响，从而提高整个网络的无线资源使用效率。

Claims (15)

  1. 一种用于基站切换中传输数据的方法，所述方法包括：
    用户设备UE根据接收的无线资源控制连接重配置RRC CR消息将主基站MeNB由第一基站切换为目标基站；
    且所述UE保持与第二基站之间的连接及与保留在第二基站传输的次基站小区组承载SCG bearer对应的协议实体不变。
  2. 根据权利要求1所述的方法，其中，在所述UE保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变的同时，所述方法还包括：
    所述UE离开第一基站小区，与目标基站小区进行同步，向所述目标基站发起随机接入，并对与主基站小区组承载MCG bearer对应的协议实体进行重建或复位；
    或者，当所述目标基站与所述第一基站为同一个基站时，所述UE与第一基站小区进行同步，向所述第一基站发起随机接入，并对与主基站小区组承载MCG bearer对应的协议实体进行重建或复位。
  3. 根据权利要求1或2所述的方法，其中，所述UE在保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变的同时增加或删减SCG bearer，并对与所述SCG bearer对应的协议实体进行重建或复位、或删除。
  4. 根据权利要求1或2所述的方法，其中，所述UE在所述保留在第二基站传输的SCG bearer上进行用户面数据传输。
  5. 一种UE，所述UE包括：接收模块、切换模块和第一协议处理模块，其中，
    所述接收模块，配置为接收无线资源控制连接重配置RRC CR消息；
    所述切换模块，配置为将主基站MeNB由第一基站切换为目标基站；
    所述第一协议处理模块，配置为保持与第二基站之间的连接及与保留在第二基站传输的次基站小区组承载SCG bearer对应的协议实体不变。
  6. 根据权利要求1所述的UE，其中，在保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变的同时，
    所述第一协议处理模块还配置为对与主基站小区组承载MCG bearer对应的协议实体进行重建或复位；所述切换模块还配置为离开第一基站小区，与目标基站小区进行同步，向所述目标基站发起随机接入；
    或者，当所述目标基站与所述第一基站为同一个基站时，所述第一协议处理模块还配置为对与主基站小区组承载MCG bearer对应的协议实体进行重建或复位；所述切换模块还用与第一基站小区进行同步，于向所述第一基站发起随机接入。
  7. 根据权利要求5或6所述的UE，其中，所述第一协议处理模块还配置为在保持与第二基站之间的连接及与保留在第二基站传输的SCG bearer对应的协议实体不变的同时增加或删减SCG bearer，并对与所述SCG bearer对应的协议实体进行重建或复位、或删除。
  8. 根据权利要求5或6所述的UE，其中，所述UE还包括第一传输模块，配置为在所述保留在第二基站传输的SCG bearer上进行用户面数据传输。
  9. 一种用于基站切换中传输数据的方法，所述方法包括：
    第二基站在主基站MeNB由第一基站切换为目标基站时，保持与UE之间的连接及与保留在第二基站传输的次基站小区组承载SCG bearer对应的协议实体不变，在所述保留在第二基站传输的SCG bearer上进行用户面数据调度。
  10. 根据权利要求9所述的方法，其中，所述方法还包括：所述第一基站向所述第二基站发送次基站SeNB释放请求，指示第二基站释放和第一 基站之间与所述UE相关的X2连接，使与所述UE相关的X2连接的释放，既不影响所述第二基站对与所述UE相关的用户面数据调度及资源配置，也不影响所述第二基站上保存的与所述UE相关的上下文。
  11. 根据权利要求9所述的方法，其中，所述方法还包括：所述第一基站向所述第二基站发送MeNB基站内切换通知消息，向所述第二基站通知MeNB进行了或正在进行基站内切换。
  12. 一种基站，所述基站包括：第二协议处理模块和第二传输模块，其中，
    所述第二协议处理模块，配置为在主基站MeNB由第一基站切换为目标基站时，保持与UE之间的连接及与保留在第二基站传输的次基站小区组承载SCG bearer对应的协议实体不变；
    所述第二传输模块，配置为在所述保留在第二基站传输的SCG bearer上进行用户面数据调度。
  13. 根据权利要求12所述的基站，其中，所述第二协议处理模块还配置为向所述第二基站发送次基站SeNB释放请求，指示第二基站释放和第一基站之间与所述UE相关的X2连接，使与所述UE相关的X2连接的释放，既不影响所述第二基站对与所述UE相关的用户面数据调度及资源配置，也不影响所述第二基站上保存的与所述UE相关的上下文。
  14. 根据权利要求12所述的基站，其中，所述第二协议处理模块还配置为向所述第二基站发送MeNB基站内切换通知消息，向所述第二基站通知MeNB进行了或正在进行基站内切换。
  15. 一种存储介质，所述存储介质中存储有计算机程序，所述计算机程序配置为执行权利要求1至4、9至11任一项所述的用于基站切换中传输数据的方法。
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