WO2018192354A1 - Procédé de transfert de données dans un processus de commutation, et station de base - Google Patents

Procédé de transfert de données dans un processus de commutation, et station de base Download PDF

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Publication number
WO2018192354A1
WO2018192354A1 PCT/CN2018/081358 CN2018081358W WO2018192354A1 WO 2018192354 A1 WO2018192354 A1 WO 2018192354A1 CN 2018081358 W CN2018081358 W CN 2018081358W WO 2018192354 A1 WO2018192354 A1 WO 2018192354A1
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WO
WIPO (PCT)
Prior art keywords
base station
data
downlink data
uplink data
handover
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PCT/CN2018/081358
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English (en)
Chinese (zh)
Inventor
路杨
周明宇
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北京佰才邦技术有限公司
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Publication of WO2018192354A1 publication Critical patent/WO2018192354A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Definitions

  • the present disclosure relates to the field of communications technologies, and in particular, to a method and a base station for data forwarding in a handover process.
  • MulteFire is a wireless access technology that extends Long Term Evolution (LTE) to unlicensed bands where unlicensed band carriers can be serviced independently of carriers licensed in the band.
  • the MulteFire system supports the UE (User Equipment) to perform automatic handover. When the UE detects that the channel quality of the current access cell and the neighboring cell meets the handover condition, the UE can automatically initiate random access to the target cell without using the target cell. Wait until the handover command of the current access cell is received.
  • UE User Equipment
  • the original base station that the UE accesses forwards at least one of the uplink data and the downlink data of the UE to the base station to which the automatically switched candidate cell belongs.
  • the uplink data of the UE is forwarded to the base station to which the automatically switched candidate cell belongs.
  • At least one of the downlink data is likely to cause a large X2 interface (interconnect interface between base stations) overhead. It can be seen that the use of the relevant data forwarding method in the automatic switching process is likely to cause waste of data transmission resources.
  • the purpose of the present disclosure is to provide a method and base station for data forwarding in a handover process to solve the problem that the data forwarding resource is easily wasted by using the related data forwarding method in the automatic handover process.
  • a method for data forwarding in a handover process includes: determining, by the first base station accessed by the user terminal UE, the automatic handover information to the UE, and determining the handover of the UE Whether the state meets the first trigger condition; if the handover state of the UE meets the first trigger condition, the first base station stops sending downlink data of the UE to the UE and/or stops sending the Uplink data of the UE; the first base station forwards uplink data and/or downlink data of the UE to a second base station, where the second base station includes a candidate base station or a station to which the candidate cell that the UE automatically switches belongs The target base station to which the target cell to which the UE automatically switches is located.
  • a base station is further provided, where the base station is a first base station accessed by a user terminal, and the first base station includes a processor, a transceiver, a memory, a user interface, and a network interface, where the processing is performed.
  • the device is configured to: after the automatic handover information is sent to the UE, determine whether the handover state of the UE meets the first trigger condition; if the handover state of the UE meets the first trigger condition, stop sending the UE to the UE Downlink data and/or stop transmitting uplink data of the UE to the core network; forwarding uplink data and/or downlink data of the UE to the second base station, where the second base station includes the UE automatically switching a candidate base station to which the candidate cell belongs or a target base station to which the target cell to which the UE automatically switches.
  • the first base station accessed by the user terminal UE sends the automatic handover information to the UE, and determines whether the handover state of the UE satisfies the first trigger condition; If the state meets the first triggering condition, the first base station stops sending downlink data of the UE to the UE and/or stops sending uplink data of the UE to a core network; the first base station sends the UE The uplink data and/or the downlink data are forwarded to the second base station, where the second base station includes a candidate base station to which the candidate cell that the UE automatically switches, or a target base station to which the target cell that the UE automatically switches.
  • the forwarding method in the handover process provided by the present disclosure can effectively reduce the overhead of the X2 interface and save the overhead of data forwarding resources.
  • FIG. 1 is a schematic flowchart of a UE handover process according to some embodiments of the present disclosure
  • FIG. 2 is a schematic flowchart of a method for data forwarding in a handover process according to some embodiments of the present disclosure
  • FIG. 3 is a schematic flowchart of an automatic handover process according to some embodiments of the present disclosure
  • FIG. 4 is a schematic flowchart of another automatic handover process according to some embodiments of the present disclosure.
  • FIG. 5 is a schematic structural diagram of a base station according to some embodiments of the present disclosure.
  • FIG. 6 is a schematic structural diagram of an apparatus for data pre-transmission in a handover process according to some embodiments of the present disclosure.
  • MulteFire (hereinafter referred to as MF) is a radio access technology that extends Long Term Evolution (LTE) to an unlicensed band in which unlicensed band carriers can be independently serviced without the aid of a licensed band carrier.
  • LTE Long Term Evolution
  • the MF physical layer introduces LBT (Listen Before Talk) similar to WiFi carrier sensing technology. Listen to it later) mechanism.
  • UE user terminal
  • MulteFire introduces a Discovery Reference Signal (DRS), which contains the main downlink common control signals, system broadcasts, and primary synchronization signals (Primary Sync Signal, PSS). ), Secondary Synchronization Signal (SSS), Enhanced Primary Sync Signal (ePSS), Enhanced Secondary Sync Signal (eSSS), Cell Reference Signal (CRS), Master Information Block (MIB) and Enhanced System Information Block (Multefire, SIB-MF).
  • DRS occupies 12 or 14 symbols (Symbols) in one downlink subframe.
  • the UE may receive the DRS in the Discovery Signals Measurement Timing Configuration (DMTC) window for downlink synchronization, reception MIB, and SIB-MF.
  • DMTC Discovery Signals Measurement Timing Configuration
  • the MF cell transmits the CRS only in a DRS subframe or another subframe that is transmitted by a Physical Downlink Shared Channel (PDSCH).
  • PDSCH Physical Downlink Shared Channel
  • FIG. 1 is a schematic diagram of a process for a UE to perform handover.
  • the UE sends a measurement report to a currently accessed first base station when detecting that a handover condition is met.
  • the first base station After receiving the measurement report sent by the UE, the first base station sends a handover preparation request to the second base station to which the target cell to which the UE needs to handover, and the second base station prepares for handover according to the handover preparation request, and Transmitting a handover preparation response to the first base station.
  • the first base station After receiving the handover preparation response, the first base station sends a relevant handover command to the UE, and the UE performs cell handover according to the related handover command.
  • a UE automatic switching mechanism is supported in the MulteFire system.
  • the automatic handover timer is started and the measurement report is reported to the first base station to which the currently accessed cell belongs.
  • the first base station After receiving the measurement report, the first base station sends an automatic handover preparation request to the second base station to which the candidate cell that is automatically switched by the UE belongs, and sends the context of the UE to the second base station and requests the first The second base station reserves resources for the UE.
  • the second base station After receiving the automatic handover preparation request, the second base station performs automatic handover preparation, and sends an automatic handover preparation response to the first base station after completing the automatic handover preparation.
  • the first base station After receiving the automatic handover preparation response, the first base station sends an automatic handover preparation message to the UE.
  • the measurement reports sent by the UE for the first time are all measurement reports prepared for automatic handover, and the measurements transmitted for the second time.
  • the reports are all measurement reports for automatic switching.
  • the UE When detecting that the signal quality of the automatic switching measurement object satisfies the measurement report condition of the automatic handover, the UE sends a measurement report to the first base station and turns on an automatic switching timer, as shown in the dotted line in FIG.
  • the sending of the measurement report by the UE to the first base station may or may not be successful, and the related handover preparation may or may not be completed, and thus is indicated by a broken line in FIG. If the first base station successfully receives the measurement report sent by the UE, the first base station prepares handover for the UE according to an relevant manner, and sends a relevant handover command to the UE after preparation.
  • the UE performs handover according to the relevant handover procedure, if the automatic handover timer of the UE expires after the first
  • the base station has not sent the relevant handover command to the UE, and the UE initiates an automatic handover procedure, that is, performs target cell selection for automatic handover, and then accesses the target cell for automatic handover.
  • the present disclosure provides a method for data forwarding in a handover process, which will be described in detail below in conjunction with specific embodiments.
  • the UE may be a mobile phone (or mobile phone), or other device capable of transmitting or receiving wireless signals, including a user equipment (terminal), a personal digital assistant (PDA). , wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, CPE (Customer Premise Equipment) or mobile intelligent hotspot capable of converting mobile signals into WiFi signals
  • PDA personal digital assistant
  • WLL wireless local loop
  • CPE Customer Premise Equipment
  • mobile intelligent hotspot capable of converting mobile signals into WiFi signals
  • the base station is not limited in form, and may be a Macro Base Station, a Pico Base Station, a Node B (3G mobile base station), an Enhanced Base Station (ENB), and a Home Enhanced Base Station (Femto eNB). Or Home eNode B or Home eNB or HNEB), relay station, access point, RRU (Remote Radio Unit), RRH (Remote Radio Head).
  • RRU Remote Radio Unit
  • RRH Remote Radio Head
  • FIG. 2 is a schematic flowchart of a method for data forwarding in a handover process according to some embodiments of the present disclosure, where an execution entity of the method may be an original base station accessed by a UE (ie, the first shown in FIG. 2 A base station), as shown in FIG. 2, the method includes the following steps 201-203.
  • an execution entity of the method may be an original base station accessed by a UE (ie, the first shown in FIG. 2 A base station), as shown in FIG. 2, the method includes the following steps 201-203.
  • Step 201 The first base station that is accessed by the user equipment UE sends the automatic handover information to the UE, and determines whether the handover state of the UE meets the first trigger condition.
  • Step 202 If the handover state of the UE meets the first trigger condition, the first base station stops sending downlink data of the UE to the UE and/or stops sending uplink data of the UE to the core network. .
  • Step 203 The first base station forwards uplink data and/or downlink data of the UE to a second base station, where the second base station includes a candidate base station or the UE to which the candidate cell that the UE automatically switches The target base station to which the target cell to be automatically switched belongs.
  • the first base station sends automatic handover information to the UE after completing the automatic handover preparation process, and determines whether the handover state of the UE satisfies the first trigger condition after transmitting the automatic handover information to the UE.
  • the first triggering condition may include a condition that the first base station can determine that the UE will perform automatic handover or a condition that the UE has performed automatic handover, and may also include other conditions.
  • the first triggering condition may include that the automatic handover timer of the UE times out and the first base station fails to send a handover command to the UE.
  • the first triggering condition may also include that the first base station receives a data forward request of the second base station or receives a measurement report for automatic handover sent by the UE.
  • the first triggering condition may further include that the first base station does not receive an acknowledgement message within a first preset time after sending downlink data to the UE, or the first base station does not receive within a second preset time. Uplink data to the UE.
  • the first base station stops sending downlink data of the UE to the UE and/or stops sending uplink data of the UE to the core network.
  • the first base station stops sending downlink data from the UE of the core network to the UE and/or stops sending to the core network. The uplink data of the UE.
  • the first base station forwards uplink data and/or downlink data of the UE to the second base station.
  • the second base station may include a candidate base station to which all candidate cells that the UE automatically switches, or may only include a candidate base station to which the target cell that the UE automatically switches. It can be understood that the target cell that the UE performs the automatic handover may belong to the candidate cell that is automatically switched by the UE, or may not belong to the candidate cell that is automatically switched by the UE.
  • the second base station may include only the target base station to which the target cell that the UE automatically switches; when the first base station fails to When determining the target cell that the UE automatically switches, the second base station includes a candidate base station to which all candidate cells that the UE automatically switches.
  • the first base station may buffer the received uplink data and/or downlink data of the UE while stopping sending downlink data of the UE to the UE and/or stopping sending uplink data of the UE to the core network. And forwarding the cached UE uplink data and/or downlink data to the second base station.
  • the received uplink data and/or downlink data of the UE may be buffered before the downlink data of the UE is sent to the UE and/or the uplink data of the UE is stopped from being sent to the core network, and then stopped.
  • the uplink data and/or downlink data of the cached UE is sent to the second base station.
  • the stopping, by the first base station, sending downlink data of the UE to the UE and/or stopping sending uplink data of the UE to the core network may include: stopping sending a non-acknowledgment (UM) mode or confirming (AM) to the UE
  • UM non-acknowledgment
  • AM confirming
  • the uplink data and/or downlink data of the UE buffered by the first base station may include downlink data of an AM mode that has been sent to the UE but is not successfully received by the UE; and/or sent by the core network.
  • the first triggering condition includes that the automatic handover timer of the UE expires and the first base station fails to send a handover command to the UE.
  • FIG. 3 is a schematic diagram of a handover process of an automatic handover according to some embodiments of the present disclosure.
  • the first base station may determine that the UE performs automatic handover.
  • the first base station stops transmitting uplink data and/or downlink data of the UE, and forwards uplink data and/or downlink data of the UE to the second base station.
  • the first base station performs data forwarding in the case that it is determined that the UE performs automatic handover, and can avoid erroneous data forwarding (for example, data forwarding can be avoided if the UE does not perform automatic switching). And can avoid premature data forwarding leading to excessive overhead of the X2 interface.
  • the manner in which the first base station determines whether the automatic handover timer of the UE is timed out may be determined by determining whether to receive the automatic handover timer timeout information sent by the UE, or by acquiring the automatic handover timer of the UE.
  • the startup time and the timing duration are determined, and then it is determined whether the automatic handover timer of the UE times out according to the startup time and the timing duration.
  • the first base station fails to send a handover command to the UE when the automatic handover timer of the UE expires, and the first base station has performed related handover preparation.
  • the first base station needs to send a handover cancellation request to the base station to which the candidate handover candidate cell belongs, and the base station to which the candidate handover candidate cell belongs is requested to release the resources prepared for the UE.
  • the UE performs related handover without starting automatic handover.
  • the first base station stops sending downlink data of the UE to the UE after transmitting a handover command to the UE, and/or stops sending uplink data of the UE to the core network, and caches the network from the core network.
  • the downlink data of the UE and/or the uplink data from the UE are used, and then the buffered uplink data and/or downlink data of the UE is sent to the base station to which the target cell of the relevant handover belongs.
  • the first base station may send a handover cancellation request to the candidate base station to which the automatically switched candidate cell belongs, to request the candidate base station to which the candidate cell to be automatically switched belongs Release the resources prepared for the UE.
  • the first trigger condition is that the automatic handover timer of the UE is timed out and the first base station fails to send a handover command to the UE, and the embodiment is limited to being able to determine at the first base station. Execute if the automatic timer of the UE times out.
  • the manner in which the first base station determines whether the automatic handover timer of the UE is timed out includes: determining, by the first base station, whether an automatic handover timer timeout information sent by the UE is received; or the first The base station determines, according to the measurement report for the automatic handover, the start time and the timing duration of the automatic handover timer of the UE, and determines whether the automatic handover timer of the UE times out according to the startup time and the timing duration.
  • the manner in which the first base station determines whether the automatic handover timer of the UE is timed out is applicable to the first trigger condition that the automatic handover timer of the UE expires and the first base station fails to successfully The UE sends a handover command.
  • the UE may send an automatic handover timer timeout information to the first base station when the automatic handover timer expires.
  • the first base station may determine whether to receive The automatic handover timer timeout information to the UE determines whether the automatic handover timer of the UE times out. Specifically, if the first base station receives the automatic handover timer timeout information of the UE, the first base station determines that the automatic handover timer of the UE times out; conversely, if the first base station does not receive The automatic handover timer timeout information of the UE, the first base station determines that the automatic handover timer of the UE does not time out.
  • the UE may carry a timing duration of the automatic handover timer of the UE in the measurement report when transmitting a measurement report for automatic handover to the first base station.
  • the first base station may determine, according to the measurement report sent by the UE, a start time and a timing duration of the automatic handover timer of the UE, and then determine, according to the startup time and the timing duration, the automatic UE. Whether the handover timer expires, for example, the first base station may estimate whether the automatic handover timer of the UE times out according to the startup time and the timing duration.
  • the measurement report for the automatic handover that is sent by the UE to the first base station may carry the start time of the automatic handover timer of the UE, or may not carry the startup time of the automatic handover timer of the UE.
  • the measurement report for the automatic handover sent by the UE carries the start time of the automatic handover timer of the UE, the first base station directly acquires the automatic from the measurement report for automatic handover.
  • the start time of the handover timer if the measurement report for the automatic handover sent by the UE does not carry the startup time of the automatic handover timer of the UE, the first base station may receive the measurement for the automatic handover according to the received
  • the reported time estimates the start time of the automatic switching timer, for example, directly determining that the time when the measurement report for the automatic switching is received is the start time of the automatic switching timer or determining the received automatic switching A certain time before the time of the measurement report is the start time of the automatic switching timer.
  • the measurement report for the automatic handover that is sent by the UE may not carry the timing duration of the automatic handover timer of the UE, and the first base station may use the pre-acquired timing duration as the UE.
  • the timing of the automatic switching timer may not carry the timing duration of the automatic handover timer of the UE, and the first base station may use the pre-acquired timing duration as the UE. The timing of the automatic switching timer.
  • the first triggering condition includes: the first base station receiving a data forwarding request sent by the second base station; or the first pre-base after the first base station sends downlink data to the UE Not receiving the acknowledgment message in the set time or the first base station does not receive the uplink data of the UE in the second preset time; or the first base station receives the measurement report for the automatic handover sent by the UE .
  • the first triggering condition may be that the first base station receives the data request sent by the second base station, or may be the first after the first base station sends the downlink data to the UE. If the acknowledgment message is not received within the preset time, or the first base station does not receive the uplink data of the UE in the second preset time, the first base station may receive the automatic handover sent by the UE. Measurement report.
  • the second base station sends a data forward request to the first base station, and the first base station determines, when receiving the data forward request sent by the second base station, The handover state of the UE meets the first trigger condition, and triggers the first base station to perform a data forwarding process.
  • the second base station may send the first base station to the first after receiving an automatic handover preparation request.
  • the base station transmits the data forward request (e.g., sends the data forward request to the first base station by an automatic handover preparation response).
  • the second base station may send the target base station to the first base station after the UE successfully accesses the automatically switched target cell. Send the data forward request, as shown in Figure 4.
  • the data forwarding method of the present disclosure can avoid communication resources caused by forwarding data to target base stations to which other non-target cells belong. waste.
  • the second base station may send the data forwarding request by using a dedicated X2 message, or may send the data forwarding request by using an existing X2 message (for example, by using a context release message of the UE).
  • the method further includes: the first base station receiving forward link configuration information sent by the second base station, where the first base station is configured according to the forward link configuration information
  • the second base station forwards the received uplink data and/or downlink data of the UE.
  • the forward link configuration information may implicitly indicate the forward data request (that is, the forward link configuration information may default to a forward data request), or may not implicitly indicate the forward data request. It depends in particular on the prior agreement between the first base station and the second base station.
  • the second base station may send the forward link configuration information to the first base station before sending the forward data request to the first base station (for example, by automatically switching preparation response)
  • the first base station sends the forward link configuration information, and may also send the forward link configuration information to the first base station while transmitting the forward data request to the first base station, where the present disclosure is This is not specifically limited.
  • the second base station when the second base station sends the forward link configuration information to the first base station by using the automatic handover preparation response, the second base station includes the candidate base station to which the candidate cell to which the UE performs automatic handover, the forwarding
  • the link configuration information may implicitly indicate the forward data request, and the first base station forwards data to the second base station; after the UE accesses the second base station, the second base station sends the message to the second base station by using a UE context release message.
  • the second base station Transmitting a data request, the second base station only includes a target base station to which the target cell to which the UE performs automatic handover, and the second base station may implicitly indicate the forward link configuration information included in the UE context release message. The forward data request.
  • the first trigger condition may include that the first base station sends downlink data to the UE.
  • the acknowledgment message is not received in the first preset time period or the first base station does not receive the uplink data of the UE in the second preset time; or the first base station receives the target sent by the UE. Automatically switch measurement report.
  • the situation that the first base station cannot accurately know whether the automatic handover timer of the UE is timed out may be that the first base station cannot determine the timing of the automatic handover timer according to the measurement report for automatic handover sent by the UE, or The first base station does not receive the measurement report for the automatic handover sent by the UE, or the UE does not send the measurement report for the automatic handover to the first base station.
  • the UE cannot successfully send a measurement report for automatic handover during the automatic handover timer timing, or the UE sends a measurement report for automatic handover to reach a maximum number of RLC retransmissions, causing the first base station to fail to receive the UE.
  • the case of a measurement report for automatic switching may be that the first base station cannot determine the timing of the automatic handover timer according to the measurement report for automatic handover sent by the UE, or The first base station does not receive the measurement report for the automatic handover sent by the UE, or the UE does not send the measurement report for the automatic handover to the first
  • the UE may not send a measurement report for automatic handover, thereby causing the first base station to fail to receive the UE. Measuring the status of the report.
  • the first base station may determine that the UE may have performed automatic handover, thereby triggering the data forwarding process of the automatic handover. It can be understood that the first base station may also trigger the data forwarding process of the automatic handover when receiving the measurement report for automatic handover sent by the UE.
  • the acknowledgement message for example, an ack message
  • the method further includes: the first base station receiving forward link configuration information sent by the second base station. Forwarding, by the first base station, uplink data and/or downlink data of the UE to the second base station, the first base station, according to the forward link configuration information, uplink data and/or downlink of the UE Data is forwarded to the second base station.
  • the first base station further receives forward link configuration information sent by the second base station, and the first base station sends uplink data and/or uplink information of the UE according to the forward link configuration information.
  • the downlink data is forwarded to the second base station.
  • the first base station may send the data to the second base station. Sending the forward link configuration information to the first base station before the forward request, or sending the forward link to the first base station while sending the data forward request to the second base station Road configuration information.
  • the first base station stops sending downlink data of the UE to the UE and/or stops sending uplink data of the UE to the core network, where the first base station stops sending to the UE. Determining downlink data of the UE and/or stopping sending uplink data of the UE to the core network and buffering uplink data and/or downlink data of the UE. Forwarding, by the first base station, uplink data and/or downlink data of the UE to the second base station, the first base station forwarding the cached uplink data and/or downlink data of the UE to the Second base station.
  • the first base station buffers the received uplink data of the UE and stops transmitting the downlink data of the UE to the UE and/or stops sending uplink data of the UE to the core network. And the uplink data, the first base station forwarding the uplink data and/or the downlink data of the UE to the second base station, specifically: the first base station, the uplink data of the cached UE and/or Or downlink data is forwarded to the second base station.
  • the method further includes: determining, by the first base station, the UE Whether the handover state meets the second trigger condition; if the handover state of the UE meets the second trigger condition, the first base station buffers downlink data and/or uplink data of the UE. Forwarding, by the first base station, uplink data and/or downlink data of the UE to the second base station, the first base station forwarding the cached uplink data and/or downlink data of the UE to the Second base station.
  • the first base station does not buffer the received downlink data of the UE while stopping sending downlink data of the UE to the UE and/or stopping sending uplink data of the UE to the core network. And/or uplink data, but determining whether the handover state of the UE satisfies the second trigger condition before stopping to send downlink data of the UE to the UE and/or stopping sending uplink data of the UE to the core network, And starting to buffer the received downlink data and/or uplink data of the UE if the handover state of the UE meets the second trigger condition.
  • the second triggering condition may include: the first base station completes automatic handover preparation of the UE; or the first base station does not receive an acknowledgement message within a first preset time after sending downlink data to the UE. Or the first base station does not receive uplink data of the UE in a second preset time; or the first base station receives a measurement report sent by the UE for automatic handover.
  • the first base station buffers the received uplink data and/or downlink data of the UE, and the first base station stops sending downlink data of the UE to the UE and/or stops sending to the core network.
  • the step of uplink data of the UE occurs before or at the same time.
  • the second triggering condition includes: the first base station completes automatic handover preparation of the UE; or the first base station does not receive in a first preset time after sending downlink data to the UE. Receiving an acknowledgment message or the first base station does not receive uplink data of the UE within a second preset time; or the first base station receives a measurement report for automatic handover sent by the UE.
  • the first base station cannot determine the time when the automatic handover timer of the UE times out, that is, the first base station cannot determine the time when the UE starts to automatically switch to the target cell
  • the first base station determines whether the handover state of the UE satisfies the second trigger condition before stopping sending the downlink data of the UE to the UE, and in the case of the handover state of the UE. Cache the uplink data and/or downlink data of the UE, that is, buffer the UE before the UE stops sending downlink data of the UE to the UE and/or stops sending uplink data of the UE to the core network. Uplink data and/or downlink data, in this way, can effectively avoid data loss.
  • the second triggering condition may be that the first base station completes the automatic handover preparation of the UE, or may be the first preset time after the first base station sends downlink data to the UE. No confirmation message is received, such as ARQ Ack (Automatic Repeat reQuest Acknowledgement) of the RLC layer or HARQ Ack (Hybrid Automatic Repeat reQuest Acknowledgement) of the MAC (Media Access Control) layer. Or the first base station does not receive the uplink data of the UE in the second preset time, and may also be that the first base station receives the measurement report for the automatic handover sent by the UE.
  • ARQ Ack Automatic Repeat reQuest Acknowledgement
  • HARQ Ack Hybrid Automatic Repeat reQuest Acknowledgement
  • the first base station does not receive the uplink data of the UE in the second preset time, and may also be that the first base station receives the measurement report for the automatic handover sent by the UE.
  • the first base station stops sending downlink data of the UE to the UE and/or stops sending uplink data of the UE to the core network, where the first base station stops sending a non- Confirming the UM mode or confirming the downlink data of the AM mode, and/or transmitting the uplink data from the UE that is successfully received in sequence to the core network, and then stopping transmitting the AM mode uplink data from the UE to the core network; and the A base station deletes the remaining AM mode uplink and/or downlink radio link control RLC layer data.
  • the sending, by the UE, the sending of the uplink data of the UE to the core network includes: sending, by the first base station, the uplink data that is successfully received in sequence to the core network, and stopping sending the AM mode from the UE to the core network. Upstream data, and delete the remaining uplink RLC layer data of the AM mode that has not been sent to the core network.
  • the uplink data sent by the UE received by the first base station is not successfully received in sequence, the uplink data cannot be sent to the core network, so the first base station sends the sequenced successful reception to the core network.
  • the uplink data of the UE is not sent to send the AM mode uplink data from the UE to the core network.
  • the MAC layer includes the uplink data and/or the downlink data of the remaining AM mode, deleting, by the first base station, the uplink and/or downlink RLC layer data of the remaining AM mode does not cause the AM uplink.
  • the loss of data and/or downlink data can effectively save the resource overhead of data forwarding and improve the efficiency of data forwarding.
  • the first base station buffers uplink data and/or downlink data of the UE, where the first base station buffers downlink data of an AM mode that has been sent to the UE but is not successfully received by the UE. And/or the first base station buffers uplink data of the AM mode or the UM mode transmitted by the core network and the first base station has not sent to the UE; and/or the first base station buffers the UE to send The upstream data of the out-of-order AM mode.
  • the first base station buffering downlink data of the UE may include buffering downlink data of an AM mode that has been sent to the UE but is not successfully received by the UE, and/or is sent by a cache core network.
  • the first base station may determine whether to buffer the downlink data of the AM mode by determining whether the UE is successfully received. Specifically, for the downlink data of the AM mode that the first base station has already sent to the UE but the UE does not successfully receive, the first base station buffers the downlink data, so that the downlink data loss can be effectively prevented.
  • the first base station buffering the uplink data of the UE may include buffering uplink data of the out-of-order AM mode sent by the UE received by the first base station. It can be understood that the uplink data of the out-of-order AM mode sent by the UE received by the first base station cannot be sent to the core network because the first base station does not receive the data in the correct order.
  • the first base station buffers the uplink data of the out-of-order AM mode sent by the UE, and avoids the loss of the uplink data.
  • the second base station can send the uplink data of the complete sequence of the AM mode to the core network.
  • the first base station that is accessed by the user equipment UE sends the automatic handover information to the UE, and determines whether the handover state of the UE meets the first trigger condition; if the handover state of the UE meets the first a triggering condition, the first base station stops sending downlink data of the UE to the UE, and/or stops sending uplink data of the UE to a core network; the first base station sends uplink data of the UE and/or The downlink data is forwarded to the second base station, where the second base station includes a candidate base station to which the candidate cell that the UE automatically switches, or a target base station to which the target cell that the UE automatically switches.
  • the forwarding method in the handover process provided by the present disclosure can effectively reduce the overhead of the X2 interface and save the overhead of data forwarding resources.
  • FIG. 5 is a schematic structural diagram of a base station according to some embodiments of the present disclosure, where the base station is a first base station accessed by a UE.
  • the first base station includes a processor 500, a transceiver 510, a memory 520, a user interface 530, and a bus interface.
  • the processor 500 is configured to read the program in the memory 520, and perform the following process: after sending the automatic handover information to the UE, determining whether the handover state of the UE meets the first trigger condition; and if the handover state of the UE If the first trigger condition is met, stop sending downlink data of the UE to the UE and/or stop sending uplink data of the UE to the core network; and forward uplink data and/or downlink data of the UE to a second base station, where the second base station includes a candidate base station to which the candidate cell that the UE automatically switches, or a target base station to which the target cell that the UE automatically switches.
  • the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 500 and various circuits of memory represented by memory 520.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • Transceiver 510 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 500 is responsible for managing the bus architecture and general processing, and the memory 520 can store data used by the processor 500 when performing operations.
  • the processor 500 is responsible for managing the bus architecture and general processing, and the memory 520 can store data used by the processor 500 when performing operations.
  • the first triggering condition includes that the automatic handover timer of the UE expires and the first base station fails to send a handover command to the UE.
  • the manner in which the processor 500 determines whether the automatic handover timer of the UE is timed out includes: determining whether an automatic handover timer timeout information sent by the UE is received, or automatically switching according to the UE
  • the measurement report determines the start time and timing duration of the automatic handover timer of the UE, and determines whether the automatic handover timer of the UE times out according to the startup time and the timing duration.
  • the first triggering condition includes: the first base station receiving a data forwarding request sent by the second base station; or the first pre-base after the first base station sends downlink data to the UE Not receiving the acknowledgment message in the set time or the first base station does not receive the uplink data of the UE in the second preset time; or the first base station receives the measurement report for the automatic handover sent by the UE .
  • the processor 500 is further configured to: receive forward link configuration information sent by the second base station; and the processor 500 forwards uplink data and/or downlink data of the UE to the second base station.
  • the method includes: forwarding uplink data and/or downlink data of the UE to the second base station according to the forward link configuration information.
  • the processor 500 stops sending downlink data of the UE to the UE and/or stops sending uplink data of the UE to the core network, including: stopping sending downlink data of the UE to the UE. And/or stopping sending uplink data of the UE to the core network and buffering uplink data and/or downlink data of the UE.
  • Forwarding, by the processor 500, uplink data and/or downlink data of the UE to the second base station includes: forwarding the buffered uplink data and/or downlink data of the UE to the second base station.
  • the processor 500 before the processor 500 stops sending downlink data of the UE to the UE and/or stops sending uplink data of the UE to the core network, the processor 500 is further configured to: determine the UE. Whether the handover state meets the second trigger condition; if the handover state of the UE meets the second trigger condition, buffering downlink data and/or uplink data of the UE. Forwarding, by the processor 500, uplink data and/or downlink data of the UE to the second base station, includes: forwarding the buffered uplink data and/or downlink data of the UE to the second base station.
  • the second triggering condition includes: the first base station completes automatic handover preparation of the UE; or the first base station does not receive in a first preset time after sending downlink data to the UE. Receiving an acknowledgment message or the first base station does not receive uplink data of the UE within a second preset time; or the first base station receives a measurement report for automatic handover sent by the UE.
  • the processor 500 stops sending downlink data of the UE to the UE and/or stops sending uplink data of the UE to the core network, including: stopping sending a non-acknowledgment UM mode or confirming to the UE.
  • the downlink data of the AM mode, and/or the sending of the uplink data from the UE that is successfully received in sequence to the core network stops transmitting the AM mode uplink data from the UE to the core network; and deletes the uplink and/or of the remaining AM mode.
  • the downlink radio link controls the RLC layer data.
  • the processor 500 buffers uplink data and/or downlink data of the UE, including: buffering downlink data of an AM mode that has been sent to the UE but not successfully received by the UE; and/or a cache. Uplink data of the AM mode or the UM mode that is sent by the core network and not sent by the first base station to the UE; and/or buffering uplink data of the out-of-order AM mode sent by the UE.
  • the first base station may be the first base station in the embodiment shown in FIG. 2, and any implementation manner of the first base station in the embodiment shown in FIG. 2 may be used in this embodiment.
  • the foregoing first base station implements and achieves the same beneficial effects, and details are not described herein again.
  • FIG. 6 shows a device 600 for data pre-transmission in a handover process provided by the present disclosure, the device 600 being applied to a first base station accessed by a user terminal UE, and including: a determining module 601, configured to After the base station sends the automatic handover information to the UE, it is determined whether the handover state of the UE meets the first trigger condition, and the stopping module 602 is configured to: when the handover state of the UE meets the first trigger condition, The first base station stops transmitting downlink data of the UE to the UE and/or stops sending uplink data of the UE to the core network; and the forwarding module 603 is configured to forward uplink data and/or downlink data of the UE. And to the second base station, where the second base station includes a candidate base station to which the candidate cell that the UE automatically switches, or a target base station to which the target cell that the UE automatically switches.
  • the first triggering condition includes that the automatic handover timer of the UE times out and the first base station fails to send a handover command to the UE.
  • the determining module 601 determines whether the automatic switching timer of the UE is timed out.
  • the determining module 601 determines whether the automatic switching timer timeout information sent by the UE is received, or the determining module 601 is configured according to
  • the measurement report for the automatic handover sent by the UE determines the start time and the timing duration of the automatic handover timer of the UE, and determines whether the automatic handover timer of the UE times out according to the startup time and the timing duration.
  • the first triggering condition includes: the first base station receiving a data forwarding request sent by the second base station; or the first base station does not have a first preset time after sending downlink data to the UE Receiving an acknowledgment message or the first base station does not receive uplink data of the UE within a second preset time; or the first base station receives a measurement report for automatic handover sent by the UE.
  • the device 600 for data forwarding in the handover process further includes a receiving module 604, and the receiving module 604 is configured to receive forwarding link configuration information sent by the second base station.
  • the forwarding module 603 is further configured to: forward uplink data and/or downlink data of the UE to the second base station according to the forward link configuration information.
  • the stopping module 602 is further configured to: stop sending downlink data of the UE to the UE, and/or stop sending uplink data of the UE to a core network, and buffer uplink data and/or downlink data of the UE;
  • the forwarding module 603 is further configured to: forward the uplink data and/or downlink data of the cached UE to the second base station.
  • the device 600 for data forwarding in the handover process further includes a buffer module 605, wherein the stopping module 602 stops sending downlink data of the UE to the UE and/or stops sending uplink data of the UE to the core network.
  • the determining module 601 determines whether the handover state of the UE meets the second trigger condition, and if the handover state of the UE meets the second trigger condition, the cache module 605 buffers downlink data of the UE and/or Or uplink data.
  • the forwarding module 603 is further configured to: forward the uplink data and/or downlink data of the cached UE to the second base station.
  • the second triggering condition includes: the first base station completing the automatic handover preparation of the UE; or the first base station does not receive the confirmation within a first preset time after sending the downlink data to the UE And the first base station does not receive the uplink data of the UE in the second preset time; or the first base station receives the measurement report sent by the UE for automatic handover.
  • the device 600 for data pre-transmission in the handover process further includes a deletion module 606.
  • the stopping module 602 is further configured to: stop sending downlink data of the non-acknowledgment UM mode or confirming the AM mode to the UE, and/or stop sending uplink data from the UE that is successfully received in sequence to the core network.
  • the AM mode uplink data from the UE is transmitted to the core network, and the uplink and/or downlink radio links of the remaining AM mode of the deletion module control RLC layer data.
  • the cache module 605 is further configured to: cache downlink data of the AM mode that has been sent to the UE but is not successfully received by the UE; and/or the core network sends the first base station The downlink data of the AM mode or the UM mode sent by the UE; and/or the uplink data of the out-of-order AM mode sent by the UE.
  • the disclosed method and apparatus may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • each functional unit in various embodiments of the present disclosure may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • system and “network” are used interchangeably herein.
  • B corresponding to A means that B is associated with A, and B can be determined from A.
  • determining B from A does not mean that B is determined solely from A, and that B can also be determined based on and/or other information.
  • the disclosed apparatus and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of some embodiments of the present disclosure.
  • each functional unit in various embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, a portion of the technical solution of the present disclosure that contributes in essence or to the related art or a part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several The instructions are for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present disclosure.
  • the foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
  • An embodiment of the present disclosure provides a method for data forwarding in a handover process, where the method includes: determining, by the first base station accessed by the user equipment UE, the automatic handover information to the UE Whether the handover state of the UE meets the first trigger condition; if the handover state of the UE meets the first trigger condition, the first base station stops sending downlink data of the UE to the UE and/or stops to the core network. Transmitting uplink data of the UE; the first base station forwarding uplink data and/or downlink data of the UE to a second base station, where the second base station includes a candidate to which the candidate cell that the UE automatically switches belongs The base station or the target base station to which the target cell that the UE automatically switches.
  • the first triggering condition comprises that an automatic handover timer of the UE times out and the first base station fails to send a handover command to the UE.
  • the determining, by the first base station, whether the automatic handover timer of the UE is timed out comprises: determining, by the first base station, whether the automatic transmission by the UE is received Switching the timer timeout information; or determining, by the first base station, the start time and the timing duration of the automatic switching timer of the UE according to the measurement report for the automatic handover sent by the UE, and determining according to the startup time and the timing duration Whether the automatic switching timer of the UE times out.
  • the first triggering condition comprises: the first base station receiving a data forwarding request sent by the second base station; or the first base station is in a direction
  • the acknowledgment message is not received in the first preset time after the downlink data is sent by the UE, or the first base station does not receive the uplink data of the UE in the second preset time; or the first base station receives A measurement report sent by the UE for automatic handover.
  • a method further comprises: the first base station receiving forward link configuration information sent by the second base station; the first base station, the UE The uplink data and/or the downlink data are forwarded to the second base station, and the first base station forwards uplink data and/or downlink data of the UE to the second base station according to the forward link configuration information.
  • A6 The method according to claim A, wherein the first base station stops sending downlink data of the UE to the UE and/or stops sending uplink data of the UE to a core network, including: The first base station stops transmitting downlink data of the UE to the UE and/or stops sending uplink data of the UE to the core network and buffers uplink data and/or downlink data of the UE; the first base station will The uplink data and/or downlink data of the UE is forwarded to the second base station, and the first base station forwards the buffered uplink data and/or downlink data of the UE to the second base station.
  • a method wherein the first base station stops transmitting downlink data of the UE to the UE and/or stops sending uplink data of the UE to the core network, The method further includes: determining, by the first base station, whether the handover state of the UE meets a second trigger condition; if the handover state of the UE meets the second trigger condition, the first base station buffers downlink data of the UE and/or Or the uplink data; the first base station forwarding the uplink data and/or downlink data of the UE to the second base station, where the first base station sends the cached uplink data and/or downlink data of the UE Forwarding to the second base station.
  • the second triggering condition comprises: the first base station completing automatic handover preparation of the UE; or the first base station transmitting downlink to the UE
  • the acknowledgment message is not received in the first preset time after the data, or the first base station does not receive the uplink data of the UE in the second preset time; or the first base station receives the sending by the UE. Measurement report for automatic switching.
  • a method wherein the first base station stops transmitting downlink data of the UE to the UE and/or stops sending uplink of the UE to a core network.
  • Data including: the first base station stops sending downlink data of the non-acknowledgment UM mode or confirming the AM mode to the UE, and/or stops sending uplink data from the UE that is successfully received in order to the core network, and then stops to the core.
  • the network transmits AM mode uplink data from the UE; the first base station deletes the remaining AM mode uplink and/or downlink radio link control RLC layer data.
  • the first base station buffers uplink data and/or downlink data of the UE, where: the first base station buffer has been sent to the UE but is not The downlink data of the AM mode successfully received by the UE; and/or the downlink data of the AM mode or the UM mode that is sent by the first base station and that is not sent by the first base station to the UE; and Or the first base station buffers uplink data of the out-of-order AM mode sent by the UE.
  • a base station where the base station is a first base station accessed by a user terminal, where the first base station includes a processor, a transceiver, a memory, a user interface, and a network interface, where the processor is configured to: After the UE sends the automatic handover information, it is determined whether the handover state of the UE meets the first trigger condition; if the handover state of the UE meets the first trigger condition, stopping sending the downlink data of the UE to the UE and And/or sending the uplink data of the UE to the core network; forwarding the uplink data and/or downlink data of the UE to the second base station, where the second base station includes a candidate cell to which the UE automatically switches The candidate base station or the target base station to which the target cell that the UE automatically switches.
  • the determining, by the processor, whether the automatic handover timer of the UE is timed out comprises: determining whether the automatic handover timer timeout information sent by the UE is received; Or determining, according to the measurement report for the automatic handover sent by the UE, a start time and a timing duration of the automatic handover timer of the UE, and determining, according to the startup time and the timing duration, whether the automatic handover timer of the UE times out.
  • the first triggering condition comprises: the first base station receiving a data forwarding request sent by the second base station; or the first base station is in a direction
  • the acknowledgment message is not received in the first preset time after the downlink data is sent by the UE, or the first base station does not receive the uplink data of the UE in the second preset time; or the first base station receives A measurement report sent by the UE for automatic handover.
  • the base station according to claim B11 wherein the processor is further configured to: receive forward link configuration information sent by the second base station; and the processor sends uplink data of the UE to And forwarding the downlink data to the second base station, including: forwarding uplink data and/or downlink data of the UE to the second base station according to the forward link configuration information.
  • the base station wherein the processor stops sending downlink data of the UE to the UE and/or stops sending uplink data of the UE to a core network, including: stopping to Transmitting, by the UE, downlink data of the UE, and/or stopping sending uplink data of the UE to a core network, and buffering uplink data and/or downlink data of the UE; And forwarding the downlink data to the second base station, including: forwarding the buffered uplink data and/or downlink data of the UE to the second base station.
  • the base station wherein the processing is stopped before the processor stops transmitting downlink data of the UE to the UE and/or stops sending uplink data of the UE to a core network.
  • the device is further configured to: determine whether the handover state of the UE meets a second trigger condition; and if the handover state of the UE meets the second trigger condition, buffer downlink data and/or uplink data of the UE; Forwarding the uplink data and/or downlink data of the UE to the second base station includes: forwarding the buffered uplink data and/or downlink data of the UE to the second base station.
  • the base station according to claim B17 wherein the second triggering condition comprises: the first base station completing automatic handover preparation of the UE; or the first base station transmitting downlink to the UE
  • the acknowledgment message is not received in the first preset time after the data, or the first base station does not receive the uplink data of the UE in the second preset time; or the first base station receives the sending by the UE. Measurement report for automatic switching.
  • the base station according to any one of claims B11 to B18, wherein the processor stops transmitting downlink data of the UE to the UE and/or stops transmitting uplink data of the UE to a core network.
  • the method includes: stopping sending downlink data of the non-acknowledgment UM mode or confirming the AM mode to the UE, and/or sending the uplink data from the UE that is successfully received in sequence to the core network, and then stopping sending the message from the UE to the core network.
  • AM mode uplink data; the remaining AM mode uplink and/or downlink radio link control RLC layer data is deleted.
  • the embodiment of the present disclosure further provides the B20, the base station according to claim B19, wherein the processor buffers uplink data and/or downlink data of the UE, including: the buffer has been sent to the UE but The downlink data of the AM mode that is not successfully received by the UE; and/or the downlink data of the AM mode or the UM mode that is sent by the core network and that is not sent by the first base station to the UE; and/or the cache The uplink data of the out-of-order AM mode transmitted by the UE.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un procédé de transfert de données dans un processus de commutation, et une station de base. Le procédé comprend les étapes suivantes : après l'envoi d'informations de commutation automatique à un équipement utilisateur (UE), une première station de base accessible par l'UE détermine si l'état de commutation de l'UE satisfait une première condition de déclenchement ; si l'état de commutation de l'UE satisfait la première condition de déclenchement, la première station de base arrête l'envoi de données de liaison descendante de l'UE à l'UE et/ou arrête l'envoi de données de liaison montante de l'UE à un réseau central ; et la première station de base transfère les données de liaison montante et/ou les données de liaison descendante de l'UE à une seconde station de base, la seconde station de base comprenant une station de base candidate à laquelle appartient une cellule candidate commutée automatiquement par l'UE ou une station de base cible à laquelle appartient une cellule cible commutée automatiquement par l'UE.
PCT/CN2018/081358 2017-04-21 2018-03-30 Procédé de transfert de données dans un processus de commutation, et station de base WO2018192354A1 (fr)

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