WO2018121189A1 - 一种无线数据单元rdu的切换方法及设备 - Google Patents

一种无线数据单元rdu的切换方法及设备 Download PDF

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Publication number
WO2018121189A1
WO2018121189A1 PCT/CN2017/114494 CN2017114494W WO2018121189A1 WO 2018121189 A1 WO2018121189 A1 WO 2018121189A1 CN 2017114494 W CN2017114494 W CN 2017114494W WO 2018121189 A1 WO2018121189 A1 WO 2018121189A1
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Prior art keywords
rdu
target
source
channel quality
resource
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PCT/CN2017/114494
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English (en)
French (fr)
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马洁
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华为技术有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/142—Reselecting a network or an air interface over the same radio air interface technology
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1221—Wireless traffic scheduling based on age of data to be sent
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a method and a device for switching a wireless data unit RDU.
  • the wireless communication network includes two types of network units, namely, a Radio Control Unit (RCU) and a Radio Data Unit (RDU).
  • the RCU is responsible for controlling the user equipment (User Equipment, UE) to access the network, allocating resources for the UE, and establishing a bearer between the UE and the core network;
  • the RDU is responsible for providing a physical air interface radio link, and real-time scheduling resources to implement the UE. Data and signaling interactions.
  • the RDU switches to the other RDU.
  • An RDU serving the UE before the UE handover is generally referred to as a source RDU, and an RDU serving the UE after the UE is switched is referred to as a target RDU.
  • the 5G network needs to control the interruption delay of data transmission in the range of 100 microseconds during the process of the UE switching from the source RDU to the target RDU.
  • An RDU switching scheme that fulfills this need for 5G networks.
  • the embodiment of the present invention provides a method and a device for switching an RDU, which are used to implement fast handover of a UE from a source RDU to a target RDU, and reduce an interruption delay of data transmission in a process in which the UE switches from a source RDU to a target RDU.
  • a method for switching an RDU according to an embodiment of the present invention includes:
  • the source RDU receives the first channel quality and the second channel quality reported by the UE served by the source RDU, where the first channel quality refers to the quality of the channel of the UE and the source RDU, and the second channel quality is Means the quality of the channel between the UE and the target RDU;
  • the source RDU determines, by the source RDU, that the first channel quality and the second channel quality meet a preset condition, and determining that the resource of the target RDU is used for scheduling by the source RDU, the source RDU to the UE Sending a first message, and sending a second message to the target RDU, where the first message is used to indicate that the UE switches from the source RDU to the target RDU, and the second message is used to indicate the source
  • the resource of the target RDU scheduled by the RDU, the resource of the target RDU is used for data transmission between the target RDU and the UE in the process of the UE switching from the source RDU to the target RDU.
  • the foregoing method can ensure that the target RDU and the UE can perform data transmission, thereby interrupting the data transmission in the process of the UE switching from the source RDU to the target RDU. Minimized to meet the interrupt latency requirements for data transmission for RDU switching in 5G networks.
  • the resource of the target RDU is only used for scheduling by the target RDU, and the target RDU and the UE may perform data transmission when the resource of the target RDU is tight.
  • the longer-term interrupt delay cannot meet the requirement of the interrupt delay of the data transmission for the RDU handover in the 5G network by using the prior art.
  • the source RDU determines, according to the second channel quality, a resource of the target RDU scheduled by the source RDU. .
  • the source RDU determines, according to the second channel quality, the resource of the target RDU scheduled by the source RDU, in the process of the UE switching from the source RDU to the target RDU, determining, according to the second channel quality, the data transmission between the target RDU and the UE.
  • the resource of the target RDU The resource of the target RDU.
  • the source RDU may determine the resource of the target RDU scheduled by the source RDU according to the second channel quality, and the source RDU may indicate the target RDU scheduled by the source RDU in the second message sent to the target RDU. resource of.
  • the foregoing method further includes:
  • the source RDU passes the source RDU established on the target RDU.
  • the media access control MAC entity mirroring schedules the target RDU to send the data that the source RDU fails to send to the UE.
  • the configuration information of the mirroring of the MAC entity of the source RDU established on the target RDU is the same as the configuration information of the MAC entity of the source RDU, and the mirroring of the MAC entity of the source RDU established on the target RDU has the same function as the MAC entity of the source RDU.
  • the image of the MAC entity of the source RDU established on the target RDU is controlled by the source RDU.
  • the application scope of the mirror image of the MAC entity of the source RDU established by the target RDU may be defined.
  • the image of the MAC entity of the source RDU established by the target RDU is bound to the UE information, and the image of the MAC entity of the source RDU established by the target RDU is applied to the RDU handover process of the UE indicated by the bound UE information,
  • the target RDU transmits data to the UE through the mirror of the established MAC entity of the source RDU in the process of the UE switching from the source RDU to the target RDU.
  • the target RDU can pass the mirroring of the MAC entity of the source RDU established on the target RDU, so the source RDU can accurately reserve the resources required for sending the failed data to the UE.
  • resource waste due to inaccurate reserved resources is avoided, and the interruption delay of data transmission during the process of switching the UE from the source RDU to the target RDU is minimized.
  • the preset condition includes:
  • the difference between the second channel quality and the first channel quality is greater than a first threshold; and/or,
  • the first channel quality is less than a second threshold, and the second channel quality is greater than a third threshold.
  • the first channel quality and the second channel quality meet the preset condition, indicating that the UE receives the source RDU signal weakly, the UE receives the target RDU signal better, and the target RDU and the UE can perform normal communication, such as voice call and video download. It is suitable for communication, so it is suitable for the UE to switch to the target RDU.
  • the resource of the target RDU includes a time domain resource of the target RDU and/or a frequency domain resource of the target RDU.
  • the same resource should be preferentially used for source RDU scheduling.
  • the source RDU can preferentially schedule the resources of the target RDU during the process of the UE switching from the source RDU to the target RDU, and further ensure that the target RDU and the UE can perform data transmission, and the UE is switched from the source RDU to the target RDU.
  • the interrupt latency of the transmission is reduced to a minimum.
  • an RDU switching method provided by an embodiment of the present invention includes:
  • the target RDU receives a message sent by the source RDU, the message is used to indicate a resource of the target RDU scheduled by the source RDU, and the resource of the target RDU is used to switch from the source RDU to the target at the UE
  • the target RDU performs data transmission with the UE in the process of the RDU;
  • the target RDU performs data transmission with the UE by using the resource of the target RDU indicated by the message, and the resource of the target RDU is used by Arranged by the source RDU.
  • the foregoing method can ensure that the target RDU and the UE can perform data transmission, thereby reducing the interruption delay of the data transmission in the process of the UE switching from the source RDU to the target RDU to a minimum.
  • the resource of the target RDU is only used for scheduling by the target RDU, and the target RDU and the UE may perform data transmission when the resource of the target RDU is tight.
  • the longer-term interrupt delay cannot meet the requirement of the interrupt delay of the data transmission for the RDU handover in the 5G network by using the prior art.
  • the target RDU before the target RDU receives the message sent by the source RDU, the target RDU reserves a setting resource, where the configured resource is used to be scheduled by the source RDU in the UE.
  • the target RDU performs data transmission with the UE in the process of switching from the source RDU to the target RDU.
  • the target RDU is configured to be reserved by the source RDU, and the target RDU and the UE can perform data transmission in the process of the UE switching from the source RDU to the target RDU, and then the UE is The interrupt latency of data transmission during the process of switching the source RDU to the target RDU is minimized.
  • the target RDU is allowed to use the reserved set resources without the UE switching to the target RDU.
  • the foregoing method further includes:
  • the target RDU is configured by the mirror of the MAC entity of the source RDU.
  • the source RDU schedules, and sends data that the source RDU fails to send to the UE.
  • the target RDU can pass the mirroring of the MAC entity of the source RDU established on the target RDU, so the source RDU can accurately reserve the resources required for sending the failed data to the UE.
  • resource waste due to inaccurate reserved resources is avoided, and the interruption delay of data transmission during the process of switching the UE from the source RDU to the target RDU is minimized.
  • the resource of the target RDU includes a time domain resource of the target RDU and/or a frequency domain resource of the target RDU.
  • a method for switching an RDU according to an embodiment of the present invention includes:
  • the user equipment UE reports the first channel quality and the second channel quality to the source RDU serving the UE, where the first channel quality refers to the quality of the channel of the UE and the source RDU, and the second channel quality Means the quality of the channel between the UE and the target RDU, the first channel quality and the second channel quality are used by the source RDU to determine that the UE switches from the source RDU to the target RDU;
  • the UE switches from the source RDU to the target RDU according to the received message, and the source RDU is used to schedule the target in a process in which the UE switches from the source RDU to the target RDU.
  • the RDU performs data transmission with the UE.
  • the foregoing method can ensure that the target RDU and the UE can perform data transmission, thereby reducing the interruption delay of the data transmission in the process of the UE switching from the source RDU to the target RDU to a minimum.
  • the resource of the target RDU is only used for scheduling by the target RDU, and the target RDU and the UE may perform data transmission when the resource of the target RDU is tight.
  • the longer-term interrupt delay cannot meet the requirement of the interrupt delay of the data transmission for the RDU handover in the 5G network by using the prior art.
  • a source RDU provided by the embodiment of the present invention includes:
  • a transceiver unit configured to receive a first channel quality and a second channel quality reported by the user equipment UE served by the source RDU, where the first channel quality refers to a quality of a channel of the UE and the source RDU, The second channel quality refers to the quality of the channel of the UE and the target RDU;
  • a processing unit configured to determine that the first channel quality and the second channel quality received by the transceiver unit meet a preset condition, and determine that resources of the target RDU are used for scheduling by the source RDU, where the target The resource of the RDU is used for data transmission between the target RDU and the UE in a process of the UE switching from the source RDU to the target RDU;
  • the transceiver unit is further configured to determine, at the processing unit, that the first channel quality and the second channel quality meet the preset condition, and determine that resources of the target RDU are used for scheduling by the source RDU Sending a first message to the UE, and sending a second message to the target RDU, where the first message is used to indicate that the UE switches from the source RDU to the target RDU, the second message A resource for indicating the target RDU scheduled by the source RDU.
  • processing unit is further configured to:
  • the sending and receiving unit Before the sending and receiving unit sends the second message to the target RDU, determining resources of the target RDU scheduled by the source RDU according to the second channel quality.
  • processing unit is further configured to:
  • the preset conditions include:
  • the difference between the second channel quality and the first channel quality is greater than a first threshold; and/or,
  • the first channel quality is less than a second threshold, and the second channel quality is greater than a third threshold.
  • the resource of the target RDU includes a time domain resource of the target RDU and/or a frequency domain resource of the target RDU.
  • a fifth aspect of the present invention provides a source RDU, including: a processor, a memory, and a transceiver;
  • the transceiver is configured to receive and send data
  • the memory is for storing instructions
  • the processor is configured to execute the instructions in the memory to perform the method provided by the first aspect.
  • an embodiment of the present invention further provides a computer storage medium for storing computer software instructions for use in a source RDU in the above aspect, comprising a program for performing the above aspects.
  • a target RDU provided by the embodiment of the present invention includes:
  • a transceiver unit configured to receive a message sent by the source RDU, where the message is used to indicate a resource of the target RDU scheduled by the source RDU, where the resource of the target RDU is used to switch from the source RDU to the UE
  • the target RDU performs data transmission with the UE in the process of the target RDU
  • a processing unit configured to control the transceiver unit and the resource of the target RDU indicated by the message received by the transceiver unit in a process of the UE switching from the source RDU to the target RDU
  • the UE performs data transmission, and the resources of the target RDU are used for scheduling by the source RDU;
  • the transceiver unit is further configured to perform data transmission with the UE by using a resource of the target RDU in a process of the UE switching from the source RDU to the target RDU.
  • processing unit is further configured to:
  • the transceiver unit Before the transceiver unit receives the message sent by the source RDU, reserve a resource for scheduling by the source RDU to be handed over by the UE from the source RDU to the target RDU.
  • the target RDU performs data transmission with the UE in the process.
  • processing unit is further configured to:
  • the mirror of the MAC entity that passes the source RDU is scheduled by the source RDU. And controlling the transceiver unit to send data that the source RDU fails to send to the UE.
  • the resource of the target RDU includes a time domain resource of the target RDU and/or a frequency domain resource of the target RDU.
  • a target RDU provided by the embodiment of the present invention includes: a processor, a memory, and a transceiver;
  • the transceiver is configured to receive and send data
  • the memory is for storing instructions
  • the processor is configured to execute the instructions in the memory and perform the method provided by the second aspect.
  • the embodiment of the present invention further provides a computer storage medium for storing computer software instructions for use in the target RDU in the above aspect, comprising: a program for performing the above aspects.
  • a tenth aspect of the present invention provides a UE, including:
  • a transceiver unit configured to report a first channel quality and a second channel quality to a source RDU serving the UE, where the first channel quality refers to a quality of a channel of the UE and the source RDU, and the second Channel quality refers to the quality of the channel of the UE and the target RDU, the first channel quality and the second channel quality are used by the source RDU to determine that the UE switches from the source RDU to the target RDU;
  • the transceiver unit is further configured to receive a message sent by the source RDU, where the message is used to indicate that the UE switches from the source RDU to the target RDU;
  • a processing unit configured to switch, according to the message received by the transceiver unit, the UE from the source RDU to the target RDU, in a process that the UE switches from the source RDU to the target RDU,
  • the source RDU is configured to schedule the target RDU to perform data transmission with the UE.
  • a UE provided by the embodiment of the present invention includes: a processor, a memory, and a transceiver;
  • the transceiver is configured to receive and send data
  • the memory is for storing instructions
  • the processor is configured to execute the instructions in the memory and perform the method provided by the third aspect.
  • the embodiment of the present invention further provides a computer storage medium for storing computer software instructions used by the UE in the above aspect, which comprises a program for performing the above aspects.
  • FIG. 1A is a schematic diagram of a 5G access network architecture
  • FIG. 1B is a schematic diagram of deployment of a 5G network
  • FIG. 2 is a schematic flowchart of a method for switching an RDU according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart of a downlink data transmission method used in a process of a UE switching from a source RDU to a target RDU according to an embodiment of the present disclosure
  • FIG. 4 is a schematic structural diagram of a source RDU according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of another source RDU according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of a target RDU according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of another target RDU according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a UE according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of another UE according to an embodiment of the present invention.
  • the method and device for switching the RDU enable the UE to quickly switch from the source RDU to the target RDU, and reduce the interruption delay of data transmission in the process of the UE switching from the source RDU to the target RDU.
  • the technical solution provided by the embodiment of the present invention is particularly applicable to a scenario in which a UE quickly switches from a source RDU to a target RDU in a 5G network, and can control an interrupted delay of data transmission for a process in which a UE switches from a source RDU to a target RDU in a 5G network. In the range of 100 microseconds.
  • the method and the device are based on the same inventive concept. Since the principles of the method and the device for solving the problem are similar, the implementation of the RDU and the method can be referred to each other, and the repeated description is not repeated.
  • the UE switching from the source RDU to the target RDU means that when the UE moves from the coverage area of the signal of one RDU to the coverage area of the signal of another RDU, the UE and the other are gradually deteriorated due to the channel quality of the UE and the one RDU.
  • the channel quality of an RDU is gradually improved, and the UE needs to switch from the one RDU to the other RDU.
  • the RDU that serves the UE before the UE handover is usually called the source RDU
  • the RDU that the UE serves after serving the UE is called the RDU.
  • the target RDU For the target RDU.
  • the RCU is responsible for controlling the UE to access the network, allocating resources for the UE, and establishing a bearer between the UE and the core network; the RDU is responsible for providing a physical air interface radio link, real-time scheduling resources to implement the UE. Perform data and signaling interactions.
  • FIG. 1A is a schematic diagram of a 5G access network architecture, and FIG. 1A includes two types of network elements, namely, an RCU and an RDU.
  • the RCU has a protocol layer entity of the access layer, including a Radio Resource Control (RRC) entity and a Packet Data Convergence Protocol (PDCP) entity; and the RDU has a protocol layer entity of the access layer. It includes a Radio Link Control (RLC) entity, a Media Access Control (MAC) entity, and a Physical Layer (PHY) entity.
  • RLC Radio Link Control
  • MAC Media Access Control
  • PHY Physical Layer
  • the RCU communicates with the core network (CN), between the RCU and the RDU, and between the device and the UE through a transceiver as shown in FIG. 1A.
  • FIG. 1B is a schematic diagram of deployment of a 5G network.
  • multiple RDUs are connected under one RCU, and multiple antenna transmission points are below one RDU, and F1 and F2 are antenna transmission points of the RDU.
  • the frequency of F1 is a low frequency band, so the coverage area of F1 is large, and the frequency of F2 is a high frequency band, so the coverage area of F2 is small.
  • the coverage area of F2 is within the coverage area of F1, and the purpose is that F2 absorbs more traffic for the hotspot area, thereby satisfying the communication service demand of a crowded area such as a shopping center or a subway station.
  • the embodiment of the invention provides a method for switching an RDU, and the method is applicable to a scenario in which a UE switches from a source RDU to a target RDU.
  • the interaction process between the UE, the source RDU, and the target RDU in the handover method of the RDU provided by the embodiment of the present invention is as follows:
  • the UE reports the first channel quality and the second channel quality to the source RDU.
  • the first channel quality refers to the quality of the channel between the UE and the source RDU
  • the second channel quality refers to the quality of the channel between the UE and the target RDU.
  • the UE Before the UE is switched from the source RDU to the target RDU, the UE is located in the signal coverage area of the source RDU, and the UE establishes an RRC link with the RCU through the source RDU, and the source RDU provides the UE with the service.
  • the UE moves to the overlapping area of the coverage area of the signal of the source RDU and the coverage area of the signal of the target RDU, the UE can receive both the signal of the source RDU and the signal of the target RDU.
  • the first channel quality of the UE and the source RDU gradually deteriorates, and the second channel quality of the UE and the target RDU gradually becomes better.
  • the UE may measure the first channel quality and the second channel quality, and report the measured first channel quality and the second channel quality to the source RDU, so that the RDU determines whether the UE can switch from the source RDU to the target RDU according to the channel quality.
  • the handover of the UE from the source RDU to the target RDU means that the UE establishes an RRC link with the RCU through the source RDU, and the UE establishes an RRC link with the RCU through the target RDU. After the UE is switched, the target RDU provides the UE with the service.
  • the information reported by the UE to the source RDU includes but is not limited to the first channel quality and the second channel quality.
  • the UE may report the source RDU to the source RDU according to the indication of the source RDU, so that the RDU determines whether the UE can switch from the source RDU to the target RDU according to the information reported by the UE.
  • the source RDU determines that the first channel quality and the second channel quality meet the preset condition, and determines that the resource of the target RDU is used for scheduling by the source RDU.
  • the first channel quality and the second channel quality meet the preset condition, indicating that the signal that the UE receives the source RDU is weak, and the signal that the UE receives the target RDU is better, so that the UE is suitable to switch to the target RDU.
  • the preset conditions include: The difference between the second channel quality and the first channel quality is greater than the first threshold, and the first threshold may be set.
  • the first threshold may be set to 3 dB or 6 dB.
  • the preset condition includes: the first channel quality is less than the second threshold, the second channel quality is greater than the third threshold, the second threshold and the third threshold may be set, and the first signal is implemented by setting the second threshold and the third threshold
  • the quality and the second signal quality are limited, such that when the first channel quality is less than the second threshold, the source RDU and the UE are unable to perform normal communication, and when the second channel quality is greater than the third threshold, the target RDU and the UE can perform normal communication, the RDU
  • the communication with the UE may refer to a voice call, a video download, and the like.
  • the resource of the target RDU in S202 is used for scheduling by the source RDU.
  • the resource of the target RDU is used for scheduling by the source RDU, and the resource of the target RDU scheduled by the source RDU is used.
  • the target RDU performs data transmission with the UE.
  • the resource of the target RDU is only used for scheduling by the target RDU, and the target RDU and the UE may perform data transmission when the resource of the target RDU is tight. Longer interrupt latency.
  • the source RDU can schedule the resources of the target RDU in the process of the UE switching from the source RDU to the target RDU, and ensure that the target RDU and the UE can perform data transmission, and the UE is switched from the source RDU to the target RDU.
  • the interrupt latency of data transmission is minimized.
  • the same resource should be used preferentially.
  • the source RDU is scheduled, so that the source RDU can schedule the resources of the target RDU during the process of the UE switching from the source RDU to the target RDU, further ensuring that the target RDU and the UE can perform data transmission, and the UE is switched from the source RDU to the target RDU.
  • the interrupt latency of data transmission is minimized.
  • the resource of the target RDU may be a time domain resource of the target RDU or a frequency domain resource of the target RDU.
  • the source RDU can determine that the UE can be handed over from the source RDU to the target RDU, and ensure that the target RDU and the UE can perform data transmission and switch the UE from the source RDU during the process of the UE switching from the source RDU to the target RDU. The interruption of data transmission during the process to the target RDU is minimized.
  • the source RDU may obtain a handover criterion from the RCU in advance, and the handover criterion is used to determine whether the UE can switch from the source RDU to the target RDU.
  • the switching criterion includes a preset condition in S202 and a resource for indicating the target RDU for scheduling by the source RDU, and the switching quasi-side may indicate which RDU resources are used for scheduling by the source RDU.
  • the preset condition may be that the difference between the second channel quality and the first channel quality is greater than a set threshold, or the first channel quality is greater than a second threshold, and the second is greater than a third threshold.
  • the switching side also includes other information.
  • the handover quasiside further includes a load threshold. If the actual load of the target RDU is greater than the load threshold, the source RDU determines that the UE cannot switch from the source RDU to the target RDU.
  • the handover side may also indicate which resources of the source RDU are used for which RDUs are scheduled.
  • the handover prospecting side may further include a maximum allowed rate of the UE, and the source RDU determines a resource of the target RDU required by the target RDU and the UE for data transmission.
  • the source RDU sends a first message to the UE, and sends a second message to the target RDU.
  • the first message is used to indicate that the UE is handed over from the source RDU to the target RDU; the second message is used to indicate the resource of the target RDU scheduled by the source RDU, and the resource of the target RDU scheduled by the source RDU is used to switch from the source RDU to the UE.
  • the target RDU performs data transmission with the UE.
  • the source RDU may determine, according to the second channel quality, the resource of the target RDU scheduled by the source RDU. Determining the source RDU scheduling according to the second channel quality
  • the resource of the target RDU refers to a resource for determining a target RDU for data transmission between the target RDU and the UE according to the second channel quality in the process of the UE switching from the source RDU to the target RDU. Determining the resource of the target RDU scheduled by the source RDU according to the second channel quality is prior art, except that in the prior art, the target RDU determines the resource of the target RDU used for data transmission between the target RDU and the UE according to the second channel quality.
  • the source RDU determines, according to the second channel quality, a resource of the target RDU used for data transmission between the target RDU and the UE.
  • the method for determining the resource of the target RDU for data transmission between the target RDU and the UE according to the second channel quality although the embodiment is different from the execution entity in the prior art, the present embodiment and the second The channel quality determines the same method for the resource of the target RDU for the target RDU and the UE for data transmission. Therefore, in this embodiment, the method for determining, by the source RDU, the resource of the target RDU scheduled by the source RDU according to the second channel quality may be referred to the prior art, and is not repeatedly described in this embodiment.
  • the UE switches from the source RDU to the target RDU according to the indication of the first message sent by the source RDU.
  • the UE may perform data transmission with the source RDU and data transmission with the target RDU under the scheduling of the source RDU.
  • the process of performing data transmission between the UE and the source RDU in the process of the UE switching from the source RDU to the target RDU is the same as that in the prior art, and is not described here again; in the process of the UE switching from the source RDU to the target RDU, the UE The data transmission process with the target RDU under the scheduling of the source RDU is the process described in the data transmission method provided by this embodiment.
  • the UE is served by the target RDU.
  • the UE is switched to the target RDU and is not described here.
  • the source RDU also needs to send a message to the UE for instructing the UE to switch from the source RDU to the target RDU.
  • the message includes all the parameters of the target RDU.
  • the UE according to the All parameters of the target RDU are transmitted with the target RDU.
  • the source RDU does not participate.
  • the first message sent by the source RDU to the UE is only used to indicate that the UE switches from the source RDU to the target RDU, and the source RDU schedules the target RDU to perform data transmission with the UE in the process of the UE switching from the source RDU to the target RDU. .
  • the target RDU performs data transmission with the UE by using the resource of the target RDU scheduled by the source RDU according to the indication of the second message.
  • the target RDU may also obtain the switching criterion from the RCU in advance.
  • the handover criterion obtained by the target RDU may indicate which RDU resources are used by the target RDU, and which RDU resources are used for scheduling by the target RDU.
  • each RDU may reserve a set resource in its own resource, and the reserved set resource is used for scheduling by other designated RDUs, and is used in the process of the UE switching from another designated RDU to itself.
  • the data transmission is performed to further ensure that the UE can perform data transmission with the UE in the process of the UE switching from the other designated RDU to the UE, and the interruption delay of the data transmission in the process of switching the UE from the source RDU to the target RDU is minimized.
  • the second device reserves the set resource, and the set resource reserved by the second device is used for scheduling by the source RDU, and is used for the target RDU in the process of the UE switching from the source RDU to the target RDU.
  • the UE performs data transmission.
  • the target RDU is allowed to use the reserved set resources without the UE switching to the target RDU.
  • An RDU handover method provided by an embodiment of the present invention may implement that a UE switches from a source RDU to a target RDU.
  • a UE switches from a source RDU to a target RDU.
  • the resource of the target RDU is used for scheduling by the source RDU
  • the resource of the target RDU scheduled by the source RDU is used for data transmission between the target RDU and the UE, and therefore the source RDU is at the UE.
  • the method provided by the embodiment of the present invention can ensure that the target RDU and the UE can perform data transmission, and the interruption delay of data transmission in the process of switching the UE from the source RDU to the target RDU is minimized, and further The need to meet the interrupt latency of data transmission for RDU handover in a 5G network.
  • the example also provides a data transmission method that is applied to a process in which a UE switches from a source RDU to a target RDU.
  • a method for transmitting downlink data in a process for a UE to switch from a source RDU to a target RDU is provided. The method includes:
  • the target RDU establishes a mirror image of the MAC entity of the source RDU.
  • the image of the MAC entity of the source RDU established on the target RDU is controlled by the source RDU.
  • the application scope of the mirror image of the MAC entity of the source RDU established by the target RDU may be defined.
  • the image of the MAC entity of the source RDU established by the target RDU is bound to the UE information, and the image of the MAC entity of the source RDU established by the target RDU is applied to the RDU handover process of the UE indicated by the bound UE information,
  • the target RDU transmits data to the UE through the mirror of the established MAC entity of the source RDU in the process of the UE switching from the source RDU to the target RDU.
  • the information of the UE includes the identifier of the UE, the upper limit of the power of the UE, the service type of the UE, the lowest rate of the UE, and the number of processes allowed by the UE.
  • the source RDU sends data to the UE in the process of the UE switching from the source RDU to the target RDU.
  • S302 specifically includes: in a process of the UE switching from the source RDU to the target RDU, when the source RDU needs to send data to the UE, the MAC entity of the source RDU generates a MAC protocol data unit (PDU), where the MAC PDU is in the physical layer. After encoding, generate at least two redundancy versions (RV) bit streams, and the source RDU sends the soft bit stream of one RV version of the at least two RV versions of the soft bit stream to the UE, thereby implementing The source RDU sends data to the UE.
  • PDU MAC protocol data unit
  • RV redundancy versions
  • the UE When the UE fails to receive data sent by the source RDU, the UE sends a Negative Acknowledge (NACK) instruction to the source RDU.
  • NACK Negative Acknowledge
  • the source RDU schedules the target RDU through the mirroring of the MAC entity of the source RDU established on the target RDU, and controls the target RDU to send data that the source RDU fails to send to the UE.
  • the S304 specifically includes: after the source RDU receives the NACK command sent by the UE, the source RDU fails to indicate that the target RDU sends a redundant version of the bit stream to the UE by using the source RDU through the mirror of the MAC entity of the source RDU established on the target RDU.
  • the first channel quality of the UE and the source RDU is poor. If the target RDU and the second channel quality of the UE are good, the source RDU indicates that the target RDU sends the bitstream of the other redundancy version to the UE through the mirror of the MAC entity of the source RDU established on the target RDU, and then the target RDU is sent to the UE.
  • the bit stream of the other redundancy version is sent, so that the target RDU retransmits the data that the source RDU fails to send to the UE.
  • the UE performs combined demodulation according to the data sent by the source RDU and the target RDU.
  • the source RDU can obtain the data that fails to be sent to the UE, so the source RDU can accurately reserve the data required for sending the failed data to the UE.
  • the resource avoids waste of resources due to inaccurate reserved resources, and at the same time minimizes the interruption of data transmission during the process of switching the UE from the source RDU to the target RDU.
  • the source RDU And the target RDU can receive the uplink data sent by the UE, and the source RDU can combine the uplink data received by the source RDU and the target RDU, and then the source RDU sends a correct response (Acknowledge, ACK) to the UE according to the combined uplink data receiving status.
  • the instruction or NACK instruction does not require the target RDU to send an ACK or NACK command to the UE.
  • the source RDU cooperates with the target RDU to perform data transmission with the UE, and automatically retransmits from the hybrid of each data packet (
  • the processing timing of Hybrid Automatic Repeat Request, HARQ) is uninterrupted.
  • the data transmission between the source RDU and the target RDU and the UE can also improve the efficiency of data transmission, and the effect of time and frequency diversity on the source RDU and the target RDU, especially for the first channel quality of the source RDU and the UE. Poor scenes work better.
  • the process of the UE switching from the source RDU to the target RDU is implemented by using the Multi-Service Aggregation (MAS) technology in the prior art.
  • the process includes: when the source RDU provides the service for the UE, the source RDU and the UE establish communication.
  • the link implements data transmission.
  • the RCU indicates that the backup communication link is established between the target RDU and the UE, and the downlink data sent by the network is transmitted to the UE through the source RDU and the target RDU, and the uplink data sent by the UE is sent.
  • the same data needs to be transmitted using two resources, resulting in low resource utilization.
  • the establishment of a backup communication link between the target RDU and the UE requires a certain amount of resources, which also results in low resource utilization. It takes a certain time for the target RDU to establish a backup communication link with the UE, which in turn causes the UE to switch from the source RDU to the target.
  • the interruption of data transmission in the process of the RDU is long, so the requirement of the interruption delay of the data transmission for the RDU handover in the 5G network cannot be satisfied.
  • the embodiment of the present invention further provides a source RDU, where the source RDU can perform the method on the source RDU side in an RDU handover method provided in Embodiment 1.
  • the source RDU 400 includes a transceiver unit 401 and a processing unit 402. among them,
  • the transceiver unit 401 is configured to receive the first channel quality and the second channel quality reported by the user equipment UE served by the source RDU 400, where the first channel quality refers to the quality of the channel of the UE and the source RDU 400, and the second channel quality refers to the UE and the target.
  • the processing unit 402 is configured to determine that the first channel quality and the second channel quality received by the transceiver unit 401 meet a preset condition, and determine that the resource of the target RDU is used for scheduling by the source RDU 400, and the resource of the target RDU is used by the source from the source RDU 400. Performing data transmission between the target RDU and the UE during handover to the target RDU;
  • the transceiver unit 401 is further configured to: when the processing unit 402 determines that the first channel quality and the second channel quality meet the preset condition, and determine that the resource of the target RDU is used by the source RDU 400, send the first message to the UE, and The RDU sends a second message, the first message is used to indicate that the UE is handed over from the source RDU 400 to the target RDU, and the second message is used to indicate the resources of the target RDU scheduled by the source RDU 400.
  • processing unit 402 is further configured to:
  • the resource of the target RDU scheduled by the source RDU 400 is determined according to the second channel quality.
  • processing unit 402 is further configured to:
  • the media access control MAC entity mirroring of the source RDU 400 established on the target RDU controls the sending and receiving of the MAC address.
  • the element 401 schedules the target RDU to transmit data that the source RDU 400 failed to transmit to the UE.
  • the preset conditions include:
  • the difference between the quality of the second channel and the quality of the first channel is greater than a first threshold; and/or,
  • the first channel quality is less than the second threshold, and the second channel quality is greater than the third threshold.
  • the resource of the target RDU includes a time domain resource of the target RDU and/or a frequency domain resource of the target RDU.
  • each unit mentioned above may be referred to an RDU switching method as shown in FIG. 3, and details are not described herein again.
  • the division of the unit in the embodiment of the present invention is schematic, and is only a logical function division, and the actual implementation may have another division manner.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • An integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, can be stored in a computer readable storage medium.
  • the technical solution of the present invention which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .
  • the embodiment of the present invention further provides a source RDU, where the source RDU may perform the method on the source RDU side in an RDU switching method provided in the first embodiment, which may be the same as the source RDU shown in FIG. device of.
  • the source RDU 500 includes a processor 501, a transceiver 502, and a memory 503. among them,
  • the processor 501 is configured to read a program in the memory 503 and perform the following process:
  • the processor 501 is configured to receive, by the transceiver 502, the first channel quality and the second channel quality reported by the UE served by the source RDU 500, where the first channel quality refers to the quality of the channel of the UE and the source RDU 500, and the second channel quality refers to the UE.
  • the processor 501 is further configured to: when determining that the first channel quality and the second channel quality meet the preset condition, and determine that the resource of the target RDU is used by the source RDU 500, send, by using the transceiver 502, the first message to the UE, and pass the The transceiver 502 sends a second message to the target RDU, where the first message is used to indicate that the UE is handed over from the source RDU 500 to the target RDU, and the second message is used to indicate the resource of the target RDU scheduled by the source RDU 500.
  • processor 501 is further configured to:
  • the resource of the target RDU scheduled by the source RDU 500 is determined according to the second channel quality before the second message is transmitted to the target RDU through the transceiver 502.
  • processor 501 is further configured to:
  • the media RDU of the source RDU 500 established on the target RDU is mirrored by the media access control MAC entity, and the target RDU is sent to the UE to send the source RDU 500. Failed data.
  • the preset conditions include:
  • the difference between the quality of the second channel and the quality of the first channel is greater than a first threshold; and/or,
  • the first channel quality is less than the second threshold, and the second channel quality is greater than the third threshold.
  • the resource of the target RDU includes a time domain resource of the target RDU and/or a frequency domain resource of the target RDU.
  • the memory 503 can store data used by the processor 501 when performing operations, and the memory 503 can be a bearer.
  • the memory of the physical host of the SDN controller such as a hard disk, a USB flash drive, a Secure Digital (SD) card, and the like.
  • Also provided in this embodiment is a computer storage medium for storing computer software instructions for use in the source RDU of the above embodiment, comprising programs for performing the above-described embodiments.
  • the embodiment of the present invention further provides a target RDU, where the target RDU can perform the method on the target RDU side in an RDU handover method provided in Embodiment 1.
  • the target RDU 600 includes a transceiver unit 601 and a processing unit 602. among them,
  • the transceiver unit 601 is configured to receive a message sent by the source RDU, where the message is used to indicate the resource of the target RDU 600 scheduled by the source RDU, and the resource of the target RDU 600 is used to perform data between the target RDU 600 and the UE in the process of the UE switching from the source RDU to the target RDU 600. transmission;
  • the processing unit 602 is configured to: in the process of the UE switching from the source RDU to the target RDU 600, control the transceiver unit 601 to perform data transmission with the UE by using the resource of the target RDU 600 indicated by the message received by the transceiver unit 601, and the resource of the target RDU 600 is used by the UE.
  • the transceiver unit 601 is further configured to perform data transmission with the UE by using resources of the target RDU 600 in the process of the UE switching from the source RDU to the target RDU 600.
  • processing unit 602 is further configured to:
  • the setting resource is reserved, and the resource is set to be used by the source RDU to perform data transmission between the target RDU 600 and the UE in the process of the UE switching from the source RDU to the target RDU 600.
  • processing unit 602 is further configured to:
  • the control transceiver unit 601 sends the data of the source RDU transmission failure to the UE.
  • the resources of the target RDU 600 include time domain resources of the target RDU 600 and/or frequency domain resources of the target RDU 600.
  • the embodiment of the present invention further provides a target RDU 700.
  • the target RDU 700 may perform the method on the target RDU 700 side in an RDU switching method provided in the first embodiment, which may be the same as the target RDU 700 shown in FIG. 6. device of.
  • the target RDU 700 includes a processor 701, a transceiver 702, and a memory 703. among them,
  • the processor 701 is configured to read a program in the memory 703 and perform the following process:
  • the processor 701 is configured to receive, by using the transceiver 702, a message sent by the source RDU, where the message is used to indicate a resource of the target RDU 700 scheduled by the source RDU, and the resource of the target RDU 700 is used in the process of the UE switching from the source RDU to the target RDU 700.
  • the RDU 700 performs data transmission with the UE;
  • the processor 701 is further configured to: during the process of the UE switching from the source RDU to the target RDU 700, control, by using the resource of the target RDU 700 indicated by the message, to perform data transmission with the UE by using the transceiver 702, where the resource of the target RDU 700 is used by the source. RDU scheduling.
  • processor 701 is further configured to:
  • a set resource is reserved for scheduling by the source RDU.
  • the target RDU 700 and the UE perform data in the process of the UE switching from the source RDU to the target RDU 700. transmission.
  • processor 701 is further configured to:
  • the image of the MAC entity of the source RDU is scheduled by the source RDU, and the transceiver 702 sends the data of the source RDU transmission failure to the UE.
  • the resources of the target RDU 700 include time domain resources of the target RDU 700 and/or frequency domain resources of the target RDU 700.
  • the memory 703 can store data used by the processor 701 in performing operations, and the memory 703 can be a memory of a physical host carrying an SDN controller, such as a hard disk, a USB flash drive, an SD card, and the like.
  • Also provided in this embodiment is a computer storage medium for storing computer software instructions for use in the target RDU of the above embodiment, comprising programs for executing the above-described embodiments.
  • the embodiment of the present invention further provides a UE, where the UE can perform the UE side method in an RDU handover method provided in Embodiment 1.
  • the UE 800 includes a transceiver unit 801 and a processing unit 802. among them:
  • the transceiver unit 801 is configured to report the first channel quality and the second channel quality to the source RDU serving the UE 800, where the first channel quality refers to the quality of the channel of the UE 800 and the source RDU, and the second channel quality refers to the UE 800 and the target RDU.
  • the quality of the channel, the first channel quality and the second channel quality are used by the source RDU to determine that the UE 800 switches from the source RDU to the target RDU;
  • the transceiver unit 801 is further configured to receive a message sent by the source RDU, where the message is used to instruct the UE 800 to switch from the source RDU to the target RDU;
  • the processing unit 802 is configured to switch the UE 800 from the source RDU to the target RDU according to the message received by the transceiver unit 801.
  • the source RDU is configured to schedule the target RDU to perform data transmission with the UE 800.
  • the embodiment of the present invention further provides a UE 900, which may perform the method on the UE 900 side in an RDU handover method provided in Embodiment 1, and may be the same device as the UE 900 shown in FIG. 8.
  • the UE 900 includes a processor 901, a transceiver 902, and a memory 903. among them,
  • the processor 901 is configured to read a program in the memory 903 and perform the following process:
  • the processor 901 is configured to report the first channel quality and the second channel quality to the source RDU serving the UE 900 by using the transceiver 902, where the first channel quality refers to the quality of the channel of the UE 900 and the source RDU, and the second channel quality refers to the UE900.
  • the quality of the channel with the target RDU, the first channel quality and the second channel quality are used by the source RDU to determine that the UE 900 switches from the source RDU to the target RDU;
  • the processor 901 is further configured to receive, by using the transceiver 902, a message sent by the source RDU, where the message is used to instruct the UE 900 to switch from the source RDU to the target RDU;
  • the processor 901 is further configured to switch the UE 900 from the source RDU to the target RDU according to the message.
  • the source RDU is configured to schedule the target RDU to perform data transmission with the UE 900.
  • the memory 903 may be a memory of a physical host carrying an SDN controller, such as a hard disk, a USB flash drive, an SD card, or the like.
  • Also provided in this embodiment is a computer storage medium for storing computer software instructions for use in the target RDU of the above embodiment, comprising programs for executing the above-described embodiments.
  • the source RDU, the target RDU, and the UE provided by the embodiment of the present invention can implement fast handover of the UE from the source RDU to the target RDU.
  • the resource of the target RDU is used for scheduling by the source RDU
  • the resource of the target RDU scheduled by the source RDU is used for data transmission between the target RDU and the UE, and therefore the source RDU is at the UE.
  • the technical solution provided by the embodiment of the present invention can ensure that the target RDU and the UE can perform data transmission, and the interruption time of data transmission in the process of switching the UE from the source RDU to the target RDU is minimized. In turn, the requirement for the interruption delay of the data transmission for the RDU handover in the 5G network is satisfied.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

一种RDU切换方法及设备，用以实现UE从源RDU快速切换至目标RDU，降低UE从源RDU切换至目标RDU的过程中数据传输的中断时延。方法包括：源RDU接收源RDU服务的用户设备UE上报的第一信道质量和第二信道质量；源RDU在确定第一信道质量与第二信道质量满足预设条件，并且确定目标RDU的资源用于被源RDU调度时，源RDU向UE发送第一消息，并向目标RDU发送第二消息，第一消息用于指示UE从源RDU切换至目标RDU，第二消息用于指示源RDU调度的目标RDU的资源，目标RDU的资源用于在UE从源RDU切换至目标RDU的过程中目标RDU与UE进行数据传输。

Description

一种无线数据单元RDU的切换方法及设备
本申请要求在2016年12月30日提交中国专利局、申请号为201611264143.9、发明名称为“一种无线数据单元RDU的切换方法及设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及无线通信领域，尤其涉及一种无线数据单元RDU的切换方法及设备。
背景技术
无线通信网络中包括两类网络单元，分别为无线控制单元(Radio Control Unit，RCU)和无线数据单元(Radio Data Unit，RDU)。其中，RCU负责控制用户设备(User Equipment，UE)接入网络、为UE分配资源以及建立UE与核心网之间的承载；RDU负责提供物理的空口无线链路，实时调度资源以实现与UE进行数据和信令的交互。
UE从一个RDU的覆盖区域移动到另一个RDU的覆盖区域时，由于UE与该一个RDU的信道质量逐渐变差，该UE与该另一个RDU的信道质量逐渐变好，该UE需要从该一个RDU切换至该另一个RDU。通常将UE切换前为该UE服务的RDU称为源RDU，将UE切换后为该UE服务的RDU称为目标RDU。
对于UE从源RDU切换至目标RDU的场景，5G网络需求在UE从源RDU切换至目标RDU的过程中将数据传输的中断时延控制在100微秒的范围内，目前标准中还没有定义能够实现5G网络的这种需求的RDU切换方案。
发明内容
本发明实施例提供了一种RDU的切换方法及设备，用以实现UE从源RDU快速切换至目标RDU，降低UE从源RDU切换至目标RDU的过程中数据传输的中断时延。
第一方面，本发明实施例提供的一种RDU的切换方法，包括：
源RDU接收所述源RDU服务的UE上报的第一信道质量和第二信道质量，所述第一信道质量是指所述UE与所述源RDU的信道的质量，所述第二信道质量是指所述UE与目标RDU的信道的质量；
所述源RDU在确定所述第一信道质量与所述第二信道质量满足预设条件，并且确定所述目标RDU的资源用于被所述源RDU调度时，所述源RDU向所述UE发送第一消息，并向所述目标RDU发送第二消息，所述第一消息用于指示所述UE从所述源RDU切换至所述目标RDU，所述第二消息用于指示所述源RDU调度的所述目标RDU的资源，所述目标RDU的资源用于在所述UE从所述源RDU切换至所述目标RDU的过程中所述目标RDU与所述UE进行数据传输。
上述方法中，由于在UE从源RDU切换至目标RDU的过程中，目标RDU的资源用于被源RDU调度，被源RDU调度的目标RDU的资源用于目标RDU与UE进行数据传输，因此在UE从源RDU切换至目标RDU的过程中，通过上述方法可以保证目标RDU与UE能够进行数据传输，进而将UE从源RDU切换至目标RDU的过程中数据传输的中断时延 降至最低，能够满足5G网络中对于RDU切换的数据传输的中断时延的需求。如果采用现有技术，在UE从源RDU切换至目标RDU的过程中，目标RDU的资源仅用于被目标RDU调度，在目标RDU的资源紧张的情况下会导致目标RDU与UE进行数据传输出现较长时间的中断延时，采用现有技术不能满足5G网络中对于RDU切换的数据传输的中断时延的需求。
在一种可能的实现方式中，所述源RDU向所述目标RDU发送所述第二消息之前，所述源RDU根据所述第二信道质量确定所述源RDU调度的所述目标RDU的资源。
其中，源RDU根据第二信道质量确定源RDU调度的目标RDU的资源是指，在UE从源RDU切换至目标RDU的过程中，根据第二信道质量确定用于目标RDU与UE进行数据传输的目标RDU的资源。源RDU根据第二信道质量确定用于目标RDU与UE进行数据传输的目标RDU的资源的方法与现有技术中目标RDU根据第二信道质量确定用于目标RDU与UE进行数据传输的目标RDU的资源的方法相同。
这样，源RDU便可以根据所述第二信道质量确定所述源RDU调度的所述目标RDU的资源，进而源RDU可以在向目标RDU发送的第二消息中指示源RDU调度的所述目标RDU的资源。
在一种可能的实现方式中，上述方法还包括：
在所述UE从所述源RDU切换至所述目标RDU的过程中，当所述源RDU向所述UE发送数据失败时，所述源RDU通过所述目标RDU上建立的所述源RDU的媒体接入控制MAC实体的镜像调度所述目标RDU向所述UE发送所述源RDU发送失败的数据。
其中，目标RDU上建立的源RDU的MAC实体的镜像的配置信息与源RDU的MAC实体的配置信息相同，目标RDU上建立的源RDU的MAC实体的镜像具有与源RDU的MAC实体相同的功能，目标RDU上建立的源RDU的MAC实体的镜像受源RDU控制。
进一步的，可以限定目标RDU建立的源RDU的MAC实体的镜像的应用范围。比如，将目标RDU建立的源RDU的MAC实体的镜像与UE信息进行绑定，表示目标RDU建立的源RDU的MAC实体的镜像应用于绑定的UE信息指示的UE的RDU切换过程中，以实现UE从源RDU切换至目标RDU的过程中目标RDU通过建立的源RDU的MAC实体的镜像向UE传输数据。
这样，由于目标RDU通过目标RDU上建立的源RDU的MAC实体的镜像，可以获得源RDU向UE发送失败的数据，因此源RDU可以精准预留用于向UE发送失败的数据所需要的资源，进而避免由于预留资源不准确导致的资源浪费，同时将UE从源RDU切换至目标RDU的过程中数据传输的中断时延降至最低。
在一种可能的实现方式中，所述预设条件包括：
所述第二信道质量与所述第一信道质量的差值大于第一阈值；和/或，
所述第一信道质量小于第二阈值，所述第二信道质量大于第三阈值。
这样，第一信道质量与第二信道质量满足预设条件，说明UE接收源RDU的信号较弱，UE接收目标RDU的信号较佳，目标RDU与UE可以进行正常通信，例如语音通话、视频下载等通信，因此适宜UE切换至目标RDU。
在一种可能的实现方式中，所述目标RDU的资源包括所述目标RDU的时域资源和/或所述目标RDU的频域资源。
在一种可能的实现方式中，在UE从源RDU切换至目标RDU的过程中，当目标RDU 与其他UE进行传输所使用的资源与源RDU调度的目标RDU的资源为同一资源时，该同一资源应优先用于源RDU调度。
这样，可以实现在UE从源RDU切换至目标RDU的过程中源RDU可以优先调度目标RDU的资源，进一步保证目标RDU与UE能够进行数据传输，将UE从源RDU切换至目标RDU的过程中数据传输的中断时延降至最低。
第二方面，本发明实施例提供的一种RDU切换方法，包括：
目标RDU接收源RDU发送的消息，所述消息用于指示所述源RDU调度的所述目标RDU的资源，所述目标RDU的资源用于在所述UE从所述源RDU切换至所述目标RDU的过程中所述目标RDU与所述UE进行数据传输；
在所述UE从所述源RDU切换至所述目标RDU的过程中，所述目标RDU通过所述消息指示的所述目标RDU的资源与所述UE进行数据传输，所述目标RDU的资源用于被所述源RDU调度。
上述方法中，由于在UE从源RDU切换至目标RDU的过程中，目标RDU的资源用于被源RDU调度，被源RDU调度的目标RDU的资源用于目标RDU与UE进行数据传输，因此在UE从源RDU切换至目标RDU的过程中，通过上述方法可以保证目标RDU与UE能够进行数据传输，进而将UE从源RDU切换至目标RDU的过程中数据传输的中断时延降至最低，能够满足5G网络中对于RDU切换的数据传输的中断时延的需求。如果采用现有技术，在UE从源RDU切换至目标RDU的过程中，目标RDU的资源仅用于被目标RDU调度，在目标RDU的资源紧张的情况下会导致目标RDU与UE进行数据传输出现较长时间的中断延时，采用现有技术不能满足5G网络中对于RDU切换的数据传输的中断时延的需求。
在一种可能的实现方式中，所述目标RDU接收源RDU发送的所述消息之前，所述目标RDU预留设定资源，所述设定资源用于被所述源RDU调度在所述UE从所述源RDU切换至所述目标RDU的过程中所述目标RDU与所述UE进行数据传输。
这样，目标RDU通过预留设定资源，该预留资源用于被源RDU调度，可以进一步保证在UE从源RDU切换至目标RDU的过程中目标RDU与UE能够进行数据传输，进而将UE从源RDU切换至目标RDU的过程中数据传输的中断时延降至最低。在没有UE切换至目标RDU的情况下，允许目标RDU使用预留的设定资源。
在一种可能的实现方式中，上述方法还包括：
所述目标RDU建立所述源RDU的媒体接入控制MAC实体的镜像；
在所述UE从所述源RDU切换至所述目标RDU的过程中，当所述源RDU向所述UE发送数据失败时，所述目标RDU通过所述源RDU的MAC实体的镜像被所述源RDU调度，向所述UE发送所述源RDU发送失败的数据。
这样，由于目标RDU通过目标RDU上建立的源RDU的MAC实体的镜像，可以获得源RDU向UE发送失败的数据，因此源RDU可以精准预留用于向UE发送失败的数据所需要的资源，进而避免由于预留资源不准确导致的资源浪费，同时将UE从源RDU切换至目标RDU的过程中数据传输的中断时延降至最低。
在一种可能的实现方式中，所述目标RDU的资源包括所述目标RDU的时域资源和/或所述目标RDU的频域资源。
第三方面，本发明实施例提供的一种RDU的切换方法，包括：
用户设备UE向为所述UE服务的源RDU上报第一信道质量和第二信道质量，所述第一信道质量是指所述UE与所述源RDU的信道的质量，所述第二信道质量是指所述UE与所述目标RDU的信道的质量，所述第一信道质量与所述第二信道质量用于所述源RDU确定所述UE从所述源RDU切换至所述目标RDU；
所述UE接收所述源RDU发送的消息，所述消息用于指示所述UE从所述源RDU切换至所述目标RDU；
所述UE根据接收的所述消息从所述源RDU切换至所述目标RDU，在所述UE从所述源RDU切换至所述目标RDU的过程中，所述源RDU用于调度所述目标RDU与所述UE进行数据传输。
上述方法中，由于在UE从源RDU切换至目标RDU的过程中，目标RDU的资源用于被源RDU调度，被源RDU调度的目标RDU的资源用于目标RDU与UE进行数据传输，因此在UE从源RDU切换至目标RDU的过程中，通过上述方法可以保证目标RDU与UE能够进行数据传输，进而将UE从源RDU切换至目标RDU的过程中数据传输的中断时延降至最低，能够满足5G网络中对于RDU切换的数据传输的中断时延的需求。如果采用现有技术，在UE从源RDU切换至目标RDU的过程中，目标RDU的资源仅用于被目标RDU调度，在目标RDU的资源紧张的情况下会导致目标RDU与UE进行数据传输出现较长时间的中断延时，采用现有技术不能满足5G网络中对于RDU切换的数据传输的中断时延的需求。
第四方面，本发明实施例提供的一种源RDU，包括：
收发单元，用于接收所述源RDU服务的用户设备UE上报的第一信道质量和第二信道质量，所述第一信道质量是指所述UE与所述源RDU的信道的质量，所述第二信道质量是指所述UE与目标RDU的信道的质量；
处理单元，用于确定所述收发单元接收的所述第一信道质量与所述第二信道质量满足预设条件，并且确定所述目标RDU的资源用于被所述源RDU调度，所述目标RDU的资源用于在所述UE从所述源RDU切换至所述目标RDU的过程中所述目标RDU与所述UE进行数据传输；
所述收发单元，还用于在所述处理单元确定所述第一信道质量与所述第二信道质量满足所述预设条件，并且确定所述目标RDU的资源用于被所述源RDU调度时，向所述UE发送第一消息，并向所述目标RDU发送第二消息，所述第一消息用于指示所述UE从所述源RDU切换至所述目标RDU，所述第二消息用于指示所述源RDU调度的所述目标RDU的资源。
在一种可能的实现中，所述处理单元还用于：
在所述收发单元向所述目标RDU发送所述第二消息之前，根据所述第二信道质量确定所述源RDU调度的所述目标RDU的资源。
在一种可能的实现中，所述处理单元还用于：
在所述UE从所述源RDU切换至所述目标RDU的过程中，当所述源RDU向所述UE发送数据失败时，通过所述目标RDU上建立的所述源RDU的媒体接入控制MAC实体的镜像，控制所述收发单元调度所述目标RDU向所述UE发送所述源RDU发送失败的数据。
在一种可能的实现中，所述预设条件包括：
所述第二信道质量与所述第一信道质量的差值大于第一阈值；和/或，
所述第一信道质量小于第二阈值，所述第二信道质量大于第三阈值。
在一种可能的实现中，所述目标RDU的资源包括所述目标RDU的时域资源和/或所述目标RDU的频域资源。
第五方面，本发明实施例提供的一种源RDU，包括：处理器、存储器和收发器；
所述收发器，用于接收和发送数据；
所述存储器用于存储指令；
所述处理器用于执行所述存储器中的所述指令，执行第一方面提供的方法。
第六方面，本发明实施例中还提供了一种计算机存储介质，用于储存为上述方面中源RDU所用的计算机软件指令，其包含用于执行上述方面中所设计的程序。
第七方面，本发明实施例提供的一种目标RDU，包括：
收发单元，用于接收源RDU发送的消息，所述消息用于指示所述源RDU调度的所述目标RDU的资源，所述目标RDU的资源用于在所述UE从所述源RDU切换至所述目标RDU的过程中所述目标RDU与所述UE进行数据传输；
处理单元，用于在所述UE从所述源RDU切换至所述目标RDU的过程中，通过所述收发单元接收的所述消息指示的所述目标RDU的资源，控制所述收发单元与所述UE进行数据传输，所述目标RDU的资源用于被所述源RDU调度；
所述收发单元，还用于在所述UE从所述源RDU切换至所述目标RDU的过程中，通过所述目标RDU的资源与所述UE进行数据传输。
在一种可能的实现中，所述处理单元还用于：
在所述收发单元接收源RDU发送的所述消息之前，预留设定资源，所述设定资源用于被所述源RDU调度在所述UE从所述源RDU切换至所述目标RDU的过程中所述目标RDU与所述UE进行数据传输。
在一种可能的实现中，所述处理单元还用于：
在所述目标RDU上建立所述源RDU的媒体接入控制MAC实体的镜像；
在所述UE从所述源RDU切换至所述目标RDU的过程中，当所述源RDU向所述UE发送数据失败时，通过所述源RDU的MAC实体的镜像被所述源RDU调度，控制所述收发单元向所述UE发送所述源RDU发送失败的数据。
在一种可能的实现中，所述目标RDU的资源包括所述目标RDU的时域资源和/或所述目标RDU的频域资源。
第八方面，本发明实施例提供的一种目标RDU，包括：处理器、存储器和收发器；
所述收发器，用于接收和发送数据；
所述存储器用于存储指令；
所述处理器用于执行所述存储器中的所述指令，执行第二方面提供的方法。
第九方面，本发明实施例中还提供了一种计算机存储介质，用于储存为上述方面中目标RDU所用的计算机软件指令，其包含用于执行上述方面中所设计的程序。
第十方面，本发明实施例提供的一种UE，包括：
收发单元，用于向为所述UE服务的源RDU上报第一信道质量和第二信道质量，所述第一信道质量是指所述UE与所述源RDU的信道的质量，所述第二信道质量是指所述UE与所述目标RDU的信道的质量，所述第一信道质量与所述第二信道质量用于所述源RDU确定所述UE从所述源RDU切换至所述目标RDU；
所述收发单元，还用于接收所述源RDU发送的消息，所述消息用于指示所述UE从所述源RDU切换至所述目标RDU；
处理单元，用于根据所述收发单元接收的所述消息将所述UE从所述源RDU切换至所述目标RDU，在所述UE从所述源RDU切换至所述目标RDU的过程中，所述源RDU用于调度所述目标RDU与所述UE进行数据传输。
第十一方面，本发明实施例提供的一种UE，包括：处理器、存储器和收发器；
所述收发器，用于接收和发送数据；
所述存储器用于存储指令；
所述处理器用于执行所述存储器中的所述指令，执行第三方面提供的方法。
第十二方面，本发明实施例中还提供了一种计算机存储介质，用于储存为上述方面中UE所用的计算机软件指令，其包含用于执行上述方面中所设计的程序。
附图说明
图1A为5G的接入网络架构示意图；
图1B为5G网络的部署示意图；
图2为本发明实施例提供的一种RDU的切换方法流程示意图；
图3为本发明实施例提供的一种应用于UE从源RDU切换至目标RDU的过程中的下行数据传输方法流程示意图；
图4为本发明实施例提供的一种源RDU的结构示意图；
图5为本发明实施例提供的另一种源RDU的结构示意图；
图6为本发明实施例提供的一种目标RDU的结构示意图；
图7为本发明实施例提供的另一种目标RDU的结构示意图；
图8为本发明实施例提供的一种UE的结构示意图；
图9为本发明实施例提供的另一种UE的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述。
本发明实施例提供的一种RDU的切换方法及设备，能够实现UE从源RDU快速切换至目标RDU，降低在UE从源RDU切换至目标RDU的过程中数据传输的中断时延。本发明实施例提供的技术方案尤其适用于5G网络中UE从源RDU快速切换至目标RDU的场景，能够针对5G网络中UE从源RDU切换至目标RDU的过程，将数据传输的中断时延控制在100微秒范围内。其中，方法和设备是基于同一发明构思的，由于方法和设备解决问题的原理相似，因此RDU与方法的实施可以相互参见，重复之处不再赘述。
UE从源RDU切换至目标RDU是指，UE从一个RDU的信号的覆盖区域向另一个RDU的信号的覆盖区域移动时，由于UE与该一个RDU的信道质量逐渐变差，该UE与该另一个RDU的信道质量逐渐变好，该UE需要从该一个RDU切换至该另一个RDU；通常将UE切换前为该UE服务的RDU称为源RDU，将UE切换后为该UE服务的RDU称为目标RDU。
在无线网络中，例如5G网络中，RCU负责控制UE接入网络、为UE分配资源以及建立UE与核心网之间的承载；RDU负责提供物理的空口无线链路，实时调度资源以实现与UE进行数据和信令的交互。
如图1A所示为5G的接入网络架构示意图，图1A中包括2类网络单元，分别为RCU和RDU。其中，RCU具有接入层的协议栈实体，包括无线资源控制(Radio Resource Control，RRC)实体和分组数据汇聚层协议(Packet Data Convergence Protocol，PDCP)实体；RDU具有接入层的协议栈实体，包括无线链路控制(Radio Link Control，RLC)实体、媒体接入控制(Media Access Control，MAC)实体和物理层(Physical Layer，PHY)实体。图1A中，RCU与核心网(Core Network，CN)之间、RCU与RDU之间以及设备与UE之间分别通过如图1A所示的收发器进行通信。
如图1B所示为5G网络的部署示意图，图1B中一个RCU下面连接了多个RDU，一个RDU下面有多个天线传输点，F1和F2是RDU的天线传输点。其中，F1的频率是低频段，所以F1的覆盖区域较大，F2的频率是高频段，所以F2的覆盖区域较小。如图1B所示F2的覆盖区域在F1的覆盖区域之内，目的是F2针对热点地区来吸收更多的话务量，进而满足比如购物中心或者地铁站等人流密集区的通信业务需求。
下面结合说明书附图对本发明各个实施例进行详细描述。需要说明的是，本发明实施例的展示顺序仅代表实施例的先后顺序，并不代表实施例所提供的技术方案的优劣。
实施例一
本发明实施例提供了一种RDU的切换方法，该方法适用于UE从源RDU切换至目标RDU的场景。如图2所示，本发明实施例提供的一种RDU的切换方法中UE、源RDU以及目标RDU之间的交互流程如下：
S201、UE向源RDU上报第一信道质量和第二信道质量。
其中，第一信道质量是指UE与源RDU的信道的质量，第二信道质量是指UE与目标RDU的信道的质量。
在UE从源RDU切换至目标RDU之前，UE位于源RDU的信号覆盖区域内，UE通过源RDU与RCU建立有RRC链路，由源RDU为UE提供服务。当UE移动到源RDU的信号的覆盖区域与目标RDU的信号的覆盖区域的重叠区域时，UE既可以接收到源RDU的信号，又可以接收到目标RDU的信号。随着UE逐渐远离源RDU、逐渐靠近目标RDU，UE与源RDU的第一信道质量逐渐变差，UE与目标RDU的第二信道质量逐渐变好。UE可以测量第一信道质量和第二信道质量，并将测量的第一信道质量和第二信道质量上报给源RDU，以使RDU根据信道质量判断UE是否可以从源RDU切换至目标RDU。UE从源RDU切换至目标RDU是指，UE通过源RDU与RCU建立RRC链路切换成UE通过目标RDU与RCU建立RRC链路，UE切换后由目标RDU为UE提供服务。
需要说明的是，UE向源RDU上报的信息包括但不限于第一信道质量和第二信道质量。本实施例中，UE可以根据源RDU的指示向源RDU进行上报，以使RDU根据UE上报的信息判断UE是否可以从源RDU切换至目标RDU。
S202、源RDU确定第一信道质量与第二信道质量满足预设条件，并且确定目标RDU的资源用于被源RDU调度。
S202中第一信道质量与第二信道质量满足预设条件，说明UE接收源RDU的信号较弱，UE接收目标RDU的信号较佳，因此适宜UE切换至目标RDU。比如，预设条件包括： 第二信道质量与第一信道质量的差值大于第一阈值，改第一阈值可以设置，例如第一阈值可以设置为3dB或者6dB。又比如，预设条件包括：第一信道质量小于第二阈值，第二信道质量大于第三阈值，第二阈值和第三阈值可以设置，通过设置第二阈值和第三阈值实现对第一信号质量和第二信号质量的限定，使得第一信道质量小于第二阈值时，源RDU与UE不能够进行正常通信，第二信道质量大于第三阈值时，目标RDU与UE可以进行正常通信，RDU与UE进行的通信可以是指语音通话、视频下载等。
S202中目标RDU的资源用于被源RDU调度是指，在UE从源RDU切换至目标RDU的过程中，目标RDU的资源用于被源RDU调度，被源RDU调度的目标RDU的资源用于目标RDU与UE进行数据传输。如果采用现有技术，在UE从源RDU切换至目标RDU的过程中，目标RDU的资源仅用于被目标RDU调度，在目标RDU的资源紧张的情况下会导致目标RDU与UE进行数据传输出现较长时间的中断延时。因此，本实施例中由于在UE从源RDU切换至目标RDU的过程中源RDU可以调度目标RDU的资源，保证目标RDU与UE能够进行数据传输，将UE从源RDU切换至目标RDU的过程中数据传输的中断时延降至最低。
较佳地，在UE从源RDU切换至目标RDU的过程中，当目标RDU与其他UE进行传输所使用的资源与源RDU调度的目标RDU的资源为同一资源时，该同一资源应优先用于源RDU调度，以使在UE从源RDU切换至目标RDU的过程中源RDU可以调度目标RDU的资源，进一步保证目标RDU与UE能够进行数据传输，将UE从源RDU切换至目标RDU的过程中数据传输的中断时延降至最低。
其中，目标RDU的资源可以是目标RDU的时域资源，也可以是目标RDU的频域资源。
源RDU在执行S202之后，便可以确定UE可以从源RDU切换至目标RDU，并且，在UE从源RDU切换至目标RDU的过程中保证目标RDU与UE能够进行数据传输，将UE从源RDU切换至目标RDU的过程中数据传输的中断时延降至最低。
本实施例中，源RDU可以预先从RCU获得切换准则，该切换准侧用于判断UE是否可以从源RDU切换至目标RDU。该切换准包括S202中的预设条件和用于指示目标RDU的资源用于被源RDU调度，切换准侧可以指示哪些RDU的资源用于被源RDU调度。例如，预设条件可以是第二信道质量与第一信道质量的差值大于设定阈值，还可以是所述第一信道质量大于第二阈值，所述第二大于第三阈值。
可选的，切换准侧还包括其他信息。例如，切换准侧还包括负荷门限，若目标RDU的实际负荷大于该负荷门限，则源RDU确定UE不可以从源RDU切换至目标RDU。又例如，切换准侧还可以指示源RDU的资源用于被哪些RDU调度。又例如，切换准侧还可以包括UE的最大允许速率，用于源RDU确定目标RDU与UE进行数据传输时需要的目标RDU的资源。
S203、源RDU向UE发送第一消息，并向目标RDU发送第二消息。
其中，第一消息用于指示UE从源RDU切换至目标RDU；第二消息用于指示源RDU调度的目标RDU的资源，该源RDU调度的目标RDU的资源用于在UE从源RDU切换至目标RDU的过程中目标RDU与UE进行数据传输。
可选的，在S203源RDU向目标RDU发送第二消息之前，源RDU可以根据第二信道质量确定源RDU调度的目标RDU的资源。其中，根据第二信道质量确定源RDU调度的 目标RDU的资源是指，在UE从源RDU切换至目标RDU的过程中，根据第二信道质量确定用于目标RDU与UE进行数据传输的目标RDU的资源。根据第二信道质量确定源RDU调度的目标RDU的资源为现有技术，只不过现有技术中是由目标RDU根据第二信道质量确定用于目标RDU与UE进行数据传输的目标RDU的资源，而本实施例中是由源RDU根据第二信道质量确定用于目标RDU与UE进行数据传输的目标RDU的资源。针对根据第二信道质量确定用于目标RDU与UE进行数据传输的目标RDU的资源的方法，虽然本实施例与现有技术中的执行主体不同，但本实施例与现有技术中根据第二信道质量确定用于目标RDU与UE进行数据传输的目标RDU的资源的方法是相同的。因此，本实施例中，源RDU根据第二信道质量确定源RDU调度的目标RDU的资源的方法可参见现有技术，本实施例中不再赘述。
S204、UE根据源RDU发送的第一消息的指示，从源RDU切换至目标RDU。
在UE从源RDU切换至目标RDU的过程中，UE既可以与源RDU进行数据传输，又可以在源RDU的调度下与目标RDU进行数据传输。其中，在UE从源RDU切换至目标RDU的过程中，UE与源RDU进行数据传输的过程与现有技术相同，此处不再赘述；在UE从源RDU切换至目标RDU的过程中，UE在源RDU的调度下与目标RDU进行数据传输过程为本实施例提供的数据传输方法描述的过程。UE切换至目标RDU之后，由目标RDU为UE提供服务，UE切换至目标RDU之后为现有技术，此处不再赘述。
现有技术中，源RDU也需要向UE发送用于指示UE从源RDU切换至目标RDU的消息，此消息包括目标RDU的全部参数，在UE从源RDU切换至目标RDU的过程中UE根据该目标RDU的全部参数与目标RDU进行数据传输，此过程源RDU不会参与。而本实施例中，源RDU向UE发送的第一消息仅用于指示UE从源RDU切换至目标RDU，在UE从源RDU切换至目标RDU的过程中源RDU调度目标RDU与UE进行数据传输。
S205、在UE从源RDU切换至目标RDU的过程中，目标RDU根据第二消息的指示，通过源RDU调度的目标RDU的资源与UE进行数据传输。
可选的，目标RDU也可以预先从RCU获得切换准则，关于该切换准侧的描述可参见S202下面的相关内容，在此不再赘述。其中，目标RDU获得的切换准则可以指示目标RDU的资源用于被哪些RDU调度，以及哪些RDU的资源用于被目标RDU调度。
本实施例中，各个RDU可以在自身的资源中预留设定资源，该预留的设定资源用于被其他指定RDU调度，用于在UE从其他指定RDU切换至自身的过程中与UE进行数据传输，进一步保证在UE从其他指定RDU切换至自身的过程中自身能够与UE进行数据传输，将UE从源RDU切换至目标RDU的过程中数据传输的中断时延降至最低。以本发明实施例中第二设备预留设定资源为例，第二设备预留的设定资源用于被源RDU调度，用于在UE从源RDU切换至目标RDU的过程中目标RDU与UE进行数据传输。在没有UE切换至目标RDU的情况下，允许目标RDU使用预留的设定资源。
本发明实施例提供的一种RDU切换方法可以实现UE从源RDU切换至目标RDU。在UE从源RDU切换至目标RDU的过程中，由于目标RDU的资源用于被源RDU调度，被源RDU调度的目标RDU的资源用于目标RDU与UE进行数据传输，因此在UE从源RDU切换至目标RDU的过程中，通过本发明实施例提供的方法可以保证目标RDU与UE能够进行数据传输，将UE从源RDU切换至目标RDU的过程中数据传输的中断时延降至最低，进而满足5G网络中对于RDU切换的数据传输的中断时延的需求。
在UE从源RDU切换至目标RDU的过程中，为了进一步保证目标RDU能够与UE进行数据传输，将UE从源RDU切换至目标RDU的过程中数据传输的中断时延降至最低，本发明实施例还提供一种数据传输方法，该方法应用于UE从源RDU切换至目标RDU的过程中。如图3所示为本发明实施例提供应用于UE从源RDU切换至目标RDU的过程中的下行数据传输方法，该方法包括：
S301、目标RDU建立源RDU的MAC实体的镜像。
S301中目标RDU向源RDU获取的源RDU的MAC实体的配置参数，然后目标RDU根据源RDU的MAC实体的配置参数建立源RDU的MAC实体的镜像。因此，目标RDU上建立的源RDU的MAC实体的镜像的配置信息与源RDU的MAC实体的配置信息相同，目标RDU上建立的源RDU的MAC实体的镜像具有与源RDU的MAC实体相同的功能。目标RDU上建立的源RDU的MAC实体的镜像受源RDU控制。
进一步的，本实施例中可以限定目标RDU建立的源RDU的MAC实体的镜像的应用范围。比如，将目标RDU建立的源RDU的MAC实体的镜像与UE信息进行绑定，表示目标RDU建立的源RDU的MAC实体的镜像应用于绑定的UE信息指示的UE的RDU切换过程中，以实现UE从源RDU切换至目标RDU的过程中目标RDU通过建立的源RDU的MAC实体的镜像向UE传输数据。其中，UE信息包括UE的标识、UE的功率上限，UE的业务类型、UE的最低速率、UE允许的进程个数等信息。
S302、在UE从源RDU切换至目标RDU的过程中，源RDU向UE发送数据。
S302具体包括：在UE从源RDU切换至目标RDU的过程中，源RDU需要向UE发送数据时，源RDU的MAC实体生成MAC协议数据单元(Protocol Data Unit，PDU)，该MAC PDU在物理层进行编码后生成至少两个冗余版本(Redundancy Version，RV)的比特(bit)流，源RDU向UE发送该至少两个RV版本的soft bit流中的一个RV版本的soft bit流，进而实现源RDU向UE发送数据。
S303、当UE接收源RDU发送的数据失败时，UE向源RDU发送错误应答(Negative Acknowledge，NACK)指令。
S304、源RDU通过目标RDU上建立的源RDU的MAC实体的镜像调度目标RDU，控制目标RDU向UE发送源RDU发送失败的数据。
S304具体包括：源RDU接收到UE发送的NACK指令后，源RDU通过目标RDU上建立的源RDU的MAC实体的镜像指示目标RDU通过源RDU向UE发送一个冗余版本的比特流失败，说明此时UE与源RDU的第一信道质量较差。在目标RDU与UE的第二信道质量较好的情况下，源RDU通过目标RDU上建立的源RDU的MAC实体的镜像指示目标RDU向UE发送其他冗余版本的比特流，然后目标RDU向UE发送其他冗余版本的比特流，进而实现目标RDU向UE重传源RDU发送失败的数据。UE根据源RDU和目标RDU发送的数据进行合并解调。
上述方法中，由于目标RDU通过目标RDU上建立的源RDU的MAC实体的镜像，可以获得源RDU向UE发送失败的数据，因此源RDU可以精准预留用于向UE发送失败的数据所需要的资源，进而避免由于预留资源不准确导致的资源浪费，同时将UE从源RDU切换至目标RDU的过程中数据传输的中断时延降至最低。
基于与如图3所示的方法相同的发明构思，针对UE从源RDU切换至目标RDU的过程中的上行数据传输，由于目标RDU上建立有源RDU的MAC实体的镜像，因此源RDU 和目标RDU都可以收到UE发送的上行数据，源RDU可以将源RDU和目标RDU接收的上行数据进行合并，然后源RDU根据合并后的上行数据接收状态向UE发送正确应答(Acknowledge，ACK)指令或NACK指令，目标RDU不需要向UE发送ACK指令或NACK指令。
本发明实施例提供的应用于UE从源RDU切换至目标RDU的过程中的数据传输方法中，源RDU与目标RDU之间合作与UE进行数据传输，从每个数据包的混合自动重传(Hybrid Automatic Repeat Request，HARQ)的处理时序上是没有中断的。通过源RDU与目标RDU之间合作与UE进行数据传输还能提高数据传输的效率，在源RDU和目标RDU上有了时间和频率分集的效果，尤其针对源RDU与UE的第一信道质量较差的场景效果更佳。
假设现有技术中采用多流集成(Multi-Service Aggregation，MAS)技术实现UE从源RDU切换至目标RDU的过程，该过程包括：源RDU为UE提供服务时，源RDU与UE通过建立的通信链路实现数据传输。在UE从源RDU切换至目标RDU的过程中，RCU指示目标RDU与UE之间建立备份通信链路，导致网络发送的下行数据会分别通过源RDU和目标RDU传输至UE，UE发送的上行数据会分别通过源RDU和目标RDU传输至网络，因此同一份数据需要使用两份资源进行传输，进而导致资源利用率低。此外，目标RDU与UE之间建立备份通信链路需要占用一定资源，也会导致资源利用率低；目标RDU与UE之间建立备份通信链路需要一定时间，进而导致UE从源RDU切换至目标RDU的过程中的数据传输的中断时延较长，因此不能满足5G网络中对于RDU切换的数据传输的中断时延的需求。
实施例二
基于同一发明构思，本发明实施例还提供了一种源RDU，该源RDU可以执行实施例一提供的一种RDU切换方法中源RDU侧的方法。参阅图4所示，源RDU400包括：收发单元401和处理单元402。其中，
收发单元401，用于接收源RDU400服务的用户设备UE上报的第一信道质量和第二信道质量，第一信道质量是指UE与源RDU400的信道的质量，第二信道质量是指UE与目标RDU的信道的质量；
处理单元402，用于确定收发单元401接收的第一信道质量与第二信道质量满足预设条件，并且确定目标RDU的资源用于被源RDU400调度，目标RDU的资源用于在UE从源RDU400切换至目标RDU的过程中目标RDU与UE进行数据传输；
收发单元401，还用于在处理单元402确定第一信道质量与第二信道质量满足预设条件，并且确定目标RDU的资源用于被源RDU400调度时，向UE发送第一消息，并向目标RDU发送第二消息，第一消息用于指示UE从源RDU400切换至目标RDU，第二消息用于指示源RDU400调度的目标RDU的资源。
可选的，处理单元402还用于：
在收发单元401向目标RDU发送第二消息之前，根据第二信道质量确定源RDU400调度的目标RDU的资源。
可选的，处理单元402还用于：
在UE从源RDU400切换至目标RDU的过程中，当源RDU400向UE发送数据失败时，通过目标RDU上建立的源RDU400的媒体接入控制MAC实体的镜像，控制收发单 元401调度目标RDU向UE发送源RDU400发送失败的数据。
可选的，预设条件包括：
第二信道质量与第一信道质量的差值大于第一阈值；和/或，
第一信道质量小于第二阈值，第二信道质量大于第三阈值。
可选的，目标RDU的资源包括目标RDU的时域资源和/或目标RDU的频域资源。
需要说明的是，上述各个单元的具体功能说明可参见如图3所示的一种RDU切换方法，此处不再赘述。本发明实施例中对单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)或处理器(processor)执行本发明各个实施例方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
基于同一发明构思，本发明实施例还提供了一种源RDU，该源RDU可以执行实施例一提供的一种RDU切换方法中源RDU侧的方法，可以是与图4所示的源RDU相同的设备。参阅图5所示，源RDU500包括：处理器501、收发器502以及存储器503。其中，
处理器501，用于读取存储器503中的程序，执行下列过程：
处理器501，用于通过收发器502接收源RDU500服务的UE上报的第一信道质量和第二信道质量，第一信道质量是指UE与源RDU500的信道的质量，第二信道质量是指UE与目标RDU的信道的质量；
处理器501，还用于在确定第一信道质量与第二信道质量满足预设条件，并且确定目标RDU的资源用于被源RDU500调度时，通过收发器502向UE发送第一消息，并通过收发器502向目标RDU发送第二消息，第一消息用于指示UE从源RDU500切换至目标RDU，第二消息用于指示源RDU500调度的目标RDU的资源。
可选的，处理器501，还用于：
在通过收发器502向目标RDU发送第二消息之前，根据第二信道质量确定源RDU500调度的目标RDU的资源。
可选的，处理器501，还用于：
在UE从源RDU500切换至目标RDU的过程中，当源RDU500向UE发送数据失败时，通过目标RDU上建立的源RDU500的媒体接入控制MAC实体的镜像，调度目标RDU向UE发送源RDU500发送失败的数据。
可选的，预设条件包括：
第二信道质量与第一信道质量的差值大于第一阈值；和/或，
第一信道质量小于第二阈值，第二信道质量大于第三阈值。
可选的，目标RDU的资源包括目标RDU的时域资源和/或目标RDU的频域资源。
存储器503可以存储处理器501在执行操作时所使用的数据，存储器503可以是承载 SDN控制器的物理主机的内存，例如硬盘、U盘、安全数码(Secure Digital，SD)卡等等。
本实施例中还提供了一种计算机存储介质，用于储存为上述实施例的源RDU所用的计算机软件指令，其包含用于执行上述实施例所设计的程序。
基于同一发明构思，本发明实施例还提供了一种目标RDU，该目标RDU可以执行实施例一提供的一种RDU切换方法中目标RDU侧的方法。参阅图6所示，目标RDU600包括：收发单元601和处理单元602。其中，
收发单元601，用于接收源RDU发送的消息，消息用于指示源RDU调度的目标RDU600的资源，目标RDU600的资源用于在UE从源RDU切换至目标RDU600的过程中目标RDU600与UE进行数据传输；
处理单元602，用于在UE从源RDU切换至目标RDU600的过程中，通过收发单元601接收的消息指示的目标RDU600的资源，控制收发单元601与UE进行数据传输，目标RDU600的资源用于被源RDU调度；
收发单元601，还用于在UE从源RDU切换至目标RDU600的过程中，通过目标RDU600的资源与UE进行数据传输。
可选的，处理单元602还用于：
在收发单元601接收源RDU发送的消息之前，预留设定资源，设定资源用于被源RDU调度在UE从源RDU切换至目标RDU600的过程中目标RDU600与UE进行数据传输。
可选的，处理单元602还用于：
在目标RDU600上建立源RDU的媒体接入控制MAC实体的镜像；
在UE从源RDU切换至目标RDU600的过程中，当源RDU向UE发送数据失败时，通过源RDU的MAC实体的镜像被源RDU调度，控制收发单元601向UE发送源RDU发送失败的数据。
可选的，目标RDU600的资源包括目标RDU600的时域资源和/或目标RDU600的频域资源。
需要说明的是，上述各个单元的具体功能说明可参见如图3所示的一种RDU切换方法，此处不再赘述。
基于同一发明构思，本发明实施例还提供了一种目标RDU700，该目标RDU700可以执行实施例一提供的一种RDU切换方法中目标RDU700侧的方法，可以是与图6所示的目标RDU700相同的设备。参阅图7所示，目标RDU700包括：处理器701、收发器702以及存储器703。其中，
处理器701，用于读取存储器703中的程序，执行下列过程：
处理器701，用于通过收发器702接收源RDU发送的消息，该消息用于指示源RDU调度的目标RDU700的资源，目标RDU700的资源用于在UE从源RDU切换至目标RDU700的过程中目标RDU700与UE进行数据传输；
处理器701，还用于在UE从源RDU切换至目标RDU700的过程中，通过所述消息指示的目标RDU700的资源，控制通过收发器702与UE进行数据传输，目标RDU700的资源用于被源RDU调度。
可选的，处理器701还用于：
在通过收发器702接收源RDU发送的消息之前，预留设定资源，该设定资源用于被源RDU调度在UE从源RDU切换至目标RDU700的过程中目标RDU700与UE进行数据 传输。
可选的，处理器701还用于：
在目标RDU700上建立源RDU的媒体接入控制MAC实体的镜像；
在UE从源RDU切换至目标RDU700的过程中，当源RDU向UE发送数据失败时，通过源RDU的MAC实体的镜像被源RDU调度，通过收发器702向UE发送源RDU发送失败的数据。
可选的，目标RDU700的资源包括目标RDU700的时域资源和/或目标RDU700的频域资源。
存储器703可以存储处理器701在执行操作时所使用的数据，存储器703可以是承载SDN控制器的物理主机的内存，例如硬盘、U盘、SD卡等等。
本实施例中还提供了一种计算机存储介质，用于储存为上述实施例的目标RDU所用的计算机软件指令，其包含用于执行上述实施例所设计的程序。
基于同一发明构思，本发明实施例还提供了一种UE，该UE可以执行实施例一提供的一种RDU切换方法中UE侧的方法。参阅图8所示，UE800包括：收发单元801和处理单元802。其中：
收发单元801，用于向为UE800服务的源RDU上报第一信道质量和第二信道质量，第一信道质量是指UE800与源RDU的信道的质量，第二信道质量是指UE800与目标RDU的信道的质量，第一信道质量与第二信道质量用于源RDU确定UE800从源RDU切换至目标RDU；
收发单元801，还用于接收源RDU发送的消息，该消息用于指示UE800从源RDU切换至目标RDU；
处理单元802，用于根据收发单元801接收的消息将UE800从源RDU切换至目标RDU，在UE800从源RDU切换至目标RDU的过程中，源RDU用于调度目标RDU与UE800进行数据传输。
需要说明的是，上述各个单元的具体功能说明可参见如图3所示的一种RDU切换方法，此处不再赘述。
基于同一发明构思，本发明实施例还提供了一种UE900，该UE900可以执行实施例一提供的一种RDU切换方法中UE900侧的方法，可以是与图8所示的UE900相同的设备。参阅图9所示，UE900包括：处理器901、收发器902以及存储器903。其中，
处理器901，用于读取存储器903中的程序，执行下列过程：
处理器901，用于通过收发器902向为UE900服务的源RDU上报第一信道质量和第二信道质量，第一信道质量是指UE900与源RDU的信道的质量，第二信道质量是指UE900与目标RDU的信道的质量，第一信道质量与第二信道质量用于源RDU确定UE900从源RDU切换至目标RDU；
处理器901，还用于通过收发器902接收源RDU发送的消息，该消息用于指示UE900从源RDU切换至目标RDU；
处理器901，还用于根据所述消息将UE900从源RDU切换至目标RDU，在UE900从源RDU切换至目标RDU的过程中，源RDU用于调度目标RDU与UE900进行数据传输。
存储器903可以是承载SDN控制器的物理主机的内存，例如硬盘、U盘、SD卡等等。
本实施例中还提供了一种计算机存储介质，用于储存为上述实施例的目标RDU所用的计算机软件指令，其包含用于执行上述实施例所设计的程序。
通过本发明实施例提供的源RDU、目标RDU以及UE，可以实现UE从源RDU快速切换至目标RDU。在UE从源RDU切换至目标RDU的过程中，由于目标RDU的资源用于被源RDU调度，被源RDU调度的目标RDU的资源用于目标RDU与UE进行数据传输，因此在UE从源RDU切换至目标RDU的过程中，通过本发明实施例提供的技术方案可以保证目标RDU与UE能够进行数据传输，将UE从源RDU切换至目标RDU的过程中数据传输的中断时延降至最低，进而满足5G网络中对于RDU切换的数据传输的中断时延的需求。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例做出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明实施例进行各种改动和变型而不脱离本发明实施例的精神和范围。这样，倘若本发明实施例的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (20)

  1. 一种无线数据单元RDU的切换方法，其特征在于，包括：
    源RDU接收所述源RDU服务的用户设备UE上报的第一信道质量和第二信道质量，所述第一信道质量是指所述UE与所述源RDU的信道的质量，所述第二信道质量是指所述UE与目标RDU的信道的质量；
    所述源RDU在确定所述第一信道质量与所述第二信道质量满足预设条件，并且确定所述目标RDU的资源用于被所述源RDU调度时，所述源RDU向所述UE发送第一消息，并向所述目标RDU发送第二消息，所述第一消息用于指示所述UE从所述源RDU切换至所述目标RDU，所述第二消息用于指示所述源RDU调度的所述目标RDU的资源，所述目标RDU的资源用于在所述UE从所述源RDU切换至所述目标RDU的过程中所述目标RDU与所述UE进行数据传输。
  2. 如权利要求1所述的方法，其特征在于，所述源RDU向所述目标RDU发送所述第二消息之前，还包括：
    所述源RDU根据所述第二信道质量确定所述源RDU调度的所述目标RDU的资源。
  3. 如权利要求1或2所述的方法，其特征在于，还包括：
    在所述UE从所述源RDU切换至所述目标RDU的过程中，当所述源RDU向所述UE发送数据失败时，所述源RDU通过所述目标RDU上建立的所述源RDU的媒体接入控制MAC实体的镜像调度所述目标RDU向所述UE发送所述源RDU发送失败的数据。
  4. 如权利要求1至3任一所述的方法，其特征在于，所述预设条件包括：
    所述第二信道质量与所述第一信道质量的差值大于第一阈值；和/或，
    所述第一信道质量小于第二阈值，所述第二信道质量大于第三阈值。
  5. 如权利要求1至4任一所述的方法，其特征在于，所述目标RDU的资源包括所述目标RDU的时域资源和/或所述目标RDU的频域资源。
  6. 一种无线数据单元RDU切换方法，其特征在于，包括：
    目标RDU接收源RDU发送的消息，所述消息用于指示所述源RDU调度的所述目标RDU的资源，所述目标RDU的资源用于在所述UE从所述源RDU切换至所述目标RDU的过程中所述目标RDU与所述UE进行数据传输；
    在所述UE从所述源RDU切换至所述目标RDU的过程中，所述目标RDU通过所述消息指示的所述目标RDU的资源与所述UE进行数据传输，所述目标RDU的资源用于被所述源RDU调度。
  7. 如权利要求6所述的方法，其特征在于，所述目标RDU接收源RDU发送的所述消息之前，还包括：
    所述目标RDU预留设定资源，所述设定资源用于被所述源RDU调度在所述UE从所述源RDU切换至所述目标RDU的过程中所述目标RDU与所述UE进行数据传输。
  8. 如权利要求6或7所述的方法，其特征在于，还包括：
    所述目标RDU建立所述源RDU的媒体接入控制MAC实体的镜像；
    在所述UE从所述源RDU切换至所述目标RDU的过程中，当所述源RDU向所述UE发送数据失败时，所述目标RDU通过所述源RDU的MAC实体的镜像被所述源RDU调度，向所述UE发送所述源RDU发送失败的数据。
  9. 如权利要求6至8任一所述的方法，其特征在于，所述目标RDU的资源包括所述目标RDU的时域资源和/或所述目标RDU的频域资源。
  10. 一种无线数据单元RDU的切换方法，其特征在于，包括：
    用户设备UE向为所述UE服务的源RDU上报第一信道质量和第二信道质量，所述第一信道质量是指所述UE与所述源RDU的信道的质量，所述第二信道质量是指所述UE与所述目标RDU的信道的质量，所述第一信道质量与所述第二信道质量用于所述源RDU确定所述UE从所述源RDU切换至所述目标RDU；
    所述UE接收所述源RDU发送的消息，所述消息用于指示所述UE从所述源RDU切换至所述目标RDU；
    所述UE根据接收的所述消息从所述源RDU切换至所述目标RDU，在所述UE从所述源RDU切换至所述目标RDU的过程中，所述源RDU用于调度所述目标RDU与所述UE进行数据传输。
  11. 一种源无线数据单元RDU，其特征在于，包括：
    收发单元，用于接收所述源RDU服务的用户设备UE上报的第一信道质量和第二信道质量，所述第一信道质量是指所述UE与所述源RDU的信道的质量，所述第二信道质量是指所述UE与目标RDU的信道的质量；
    处理单元，用于确定所述收发单元接收的所述第一信道质量与所述第二信道质量满足预设条件，并且确定所述目标RDU的资源用于被所述源RDU调度，所述目标RDU的资源用于在所述UE从所述源RDU切换至所述目标RDU的过程中所述目标RDU与所述UE进行数据传输；
    所述收发单元，还用于在所述处理单元确定所述第一信道质量与所述第二信道质量满足所述预设条件，并且确定所述目标RDU的资源用于被所述源RDU调度时，向所述UE发送第一消息，并向所述目标RDU发送第二消息，所述第一消息用于指示所述UE从所述源RDU切换至所述目标RDU，所述第二消息用于指示所述源RDU调度的所述目标RDU的资源。
  12. 如权利要求11所述的源RDU，其特征在于，所述处理单元还用于：
    在所述收发单元向所述目标RDU发送所述第二消息之前，根据所述第二信道质量确定所述源RDU调度的所述目标RDU的资源。
  13. 如权利要求11或12所述的源RDU，其特征在于，所述处理单元还用于：
    在所述UE从所述源RDU切换至所述目标RDU的过程中，当所述源RDU向所述UE发送数据失败时，通过所述目标RDU上建立的所述源RDU的媒体接入控制MAC实体的镜像，控制所述收发单元调度所述目标RDU向所述UE发送所述源RDU发送失败的数据。
  14. 如权利要求11至13任一所述的源RDU，其特征在于，所述预设条件包括：
    所述第二信道质量与所述第一信道质量的差值大于第一阈值；和/或，
    所述第一信道质量小于第二阈值，所述第二信道质量大于第三阈值。
  15. 如权利要求11至14任一所述的源RDU，其特征在于，所述目标RDU的资源包括所述目标RDU的时域资源和/或所述目标RDU的频域资源。
  16. 一种目标无线数据单元RDU，其特征在于，包括：
    收发单元，用于接收源RDU发送的消息，所述消息用于指示所述源RDU调度的所述目标RDU的资源，所述目标RDU的资源用于在所述UE从所述源RDU切换至所述目标 RDU的过程中所述目标RDU与所述UE进行数据传输；
    处理单元，用于在所述UE从所述源RDU切换至所述目标RDU的过程中，通过所述收发单元接收的所述消息指示的所述目标RDU的资源，控制所述收发单元与所述UE进行数据传输，所述目标RDU的资源用于被所述源RDU调度；
    所述收发单元，还用于在所述UE从所述源RDU切换至所述目标RDU的过程中，通过所述目标RDU的资源与所述UE进行数据传输。
  17. 如权利要求16所述的目标RDU，其特征在于，所述处理单元还用于：
    在所述收发单元接收源RDU发送的所述消息之前，预留设定资源，所述设定资源用于被所述源RDU调度在所述UE从所述源RDU切换至所述目标RDU的过程中所述目标RDU与所述UE进行数据传输。
  18. 如权利要求16或17所述的目标RDU，其特征在于，所述处理单元还用于：
    在所述目标RDU上建立所述源RDU的媒体接入控制MAC实体的镜像；
    在所述UE从所述源RDU切换至所述目标RDU的过程中，当所述源RDU向所述UE发送数据失败时，通过所述源RDU的MAC实体的镜像被所述源RDU调度，控制所述收发单元向所述UE发送所述源RDU发送失败的数据。
  19. 如权利要求16至18任一所述的目标RDU，其特征在于，所述目标RDU的资源包括所述目标RDU的时域资源和/或所述目标RDU的频域资源。
  20. 一种用户设备UE，其特征在于，包括：
    收发单元，用于向为所述UE服务的源RDU上报第一信道质量和第二信道质量，所述第一信道质量是指所述UE与所述源RDU的信道的质量，所述第二信道质量是指所述UE与所述目标RDU的信道的质量，所述第一信道质量与所述第二信道质量用于所述源RDU确定所述UE从所述源RDU切换至所述目标RDU；
    所述收发单元，还用于接收所述源RDU发送的消息，所述消息用于指示所述UE从所述源RDU切换至所述目标RDU；
    处理单元，用于根据所述收发单元接收的所述消息将所述UE从所述源RDU切换至所述目标RDU，在所述UE从所述源RDU切换至所述目标RDU的过程中，所述源RDU用于调度所述目标RDU与所述UE进行数据传输。
PCT/CN2017/114494 2016-12-30 2017-12-04 一种无线数据单元rdu的切换方法及设备 WO2018121189A1 (zh)

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