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WO2020061871A1 - Procédé de communication et appareil de communication - Google Patents

Procédé de communication et appareil de communication Download PDF

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Publication number
WO2020061871A1
WO2020061871A1 PCT/CN2018/107811 CN2018107811W WO2020061871A1 WO 2020061871 A1 WO2020061871 A1 WO 2020061871A1 CN 2018107811 W CN2018107811 W CN 2018107811W WO 2020061871 A1 WO2020061871 A1 WO 2020061871A1
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WO
WIPO (PCT)
Prior art keywords
base station
terminal device
source base
target base
instruction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2018/107811
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English (en)
Chinese (zh)
Inventor
唐珣
王宏
张戬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/CN2018/107811 priority Critical patent/WO2020061871A1/fr
Priority to CN201880097980.8A priority patent/CN112753249A/zh
Publication of WO2020061871A1 publication Critical patent/WO2020061871A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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 application relates to the field of communication, and more particularly, to a communication method and a communication device.
  • a terminal equipment (UE) when a terminal equipment (UE) moves, the UE may perform a handover of a serving base station according to a change in signal strength.
  • LTE Long Term Evolution
  • the UE After the UE receives the handover command, the UE disconnects the radio resource control (radio resource control) of the source base station. Then, the UE will start the random access procedure for the target base station. After the UE sends a handover completion message to the target base station, the UE resumes the RRC connection (that is, the RRC connection with the target base station). During this handover process, the UE's data transmission is interrupted. In addition, after the source base station sends a handover command to the UE, the source base station immediately forwards the data of the UE to the target base station.
  • radio resource control radio resource control
  • MBB make before break
  • an enhanced MBB technology is proposed.
  • the UE is connected to the source base station and the target base station at the same time. Specifically, even during a random access process between the UE and the target base station, the connection between the UE and the source base station is not interrupted. In this way, during the handover process, for a period of time, the UE maintains a connection with the source base station and the target base station at the same time, and can also perform data transmission simultaneously.
  • the UE is connected to the source base station and the target base station at the same time, which can also be referred to as the simultaneous connection of the UE and the dual base stations.
  • the source base station needs to send a serial number (SN) status transfer message to the target base station, so that the target base station sends the source base station to the target according to the SN status transfer message.
  • the data of the UE forwarded by the base station and the target base station to confirm the uplink missing data packet SN.
  • the prior art does not design the sending mode of the SN state transfer message in detail, that is, it does not design in detail how the SN state transfer message is forwarded from the source base station to the target base station. Therefore, in the scenario where the UE and the dual base stations are connected at the same time, how to forward the SN state transfer message from the source base station to the target base station is a technical problem to be solved urgently.
  • the present application provides a communication method and a communication device.
  • the communication method and communication device can realize the forwarding of the SN state transfer message from the source base station to the target base station in a scenario where the UE and the dual base stations are connected at the same time.
  • the present application provides a communication method including: a source base station sending a handover command to a terminal device; the source base station receiving a first instruction from the terminal device, a target base station, or a core network element; responding to In the first instruction, the source base station sends a sequence number status transfer message to the target base station.
  • the source base station may receive a first instruction from a terminal device, a target base station, or a core network element, so that the source base station may send an SN status transfer message to the target base station in response to the first instruction. That is to say, the communication method can realize that the SN state transfer message is forwarded from the source base station to the target base station.
  • the source base station sends the SN status transfer message to the target base station under the instruction of the first instruction sent by the terminal device, the target base station, or the core network element, when the source base station starts the target base station at the terminal device
  • the time point at which the source base station sends the SN status transfer message to the target base station is relatively compared to the traditional SN status transfer message
  • the sending event is delayed, which can delay the time point of data communication between the target base station and the terminal device, thereby saving transmission resources between the target base station and the terminal device.
  • the communication method further includes: in response to the first indication, the source base station initiates data forwarding of the terminal device to the target base station.
  • the source base station initiates data forwarding of the terminal device to the target base station only after being triggered by the first instruction, thereby delaying the time when the source base station initiates data forwarding of the terminal device to the target base station, thereby saving the source base station and the target. Transmission resources between base stations.
  • the receiving, by the source base station, the first instruction from the terminal device, the target base station, or a core network element includes: the source base station completes randomization for the target base station at the terminal device. After the access process, the first instruction is received from the terminal device, the target base station, or the core network element.
  • the source base station when the source base station receives the first instruction from the terminal device, the first instruction is carried in a radio resource control message or a media access layer control unit, or the The first indication is a physical layer-specific indication.
  • the source base station when the source base station receives the first indication from the core network element, the first indication is an end character.
  • the data forwarding includes uplink data forwarding, or the data forwarding includes downlink data forwarding, or the data forwarding includes uplink data forwarding and downlink data forwarding.
  • the present application provides a communication method.
  • the communication method includes: a target base station receives a handover request message from a source base station; the target base station receives a random access preamble from a terminal device; and the target base station sends the source base station to the source base station.
  • Sending a first instruction the first instruction is used to trigger the source base station to send a serial number status transfer message to the target base station; the target base station receives the serial number status transfer message from the source base station.
  • the target base station sends a first instruction to the source base station, so that the source base station can send an SN status transfer message to the target base station in response to the first instruction, that is, transmission of the SN status transfer message from the source base station to the target base station can be achieved.
  • the target base station sends the first indication to the source base station after receiving the random access preamble from the terminal device, so that the source base station can send the SN status transfer message to the target base station after the terminal device starts random access. Because the target base station only performs data communication with the terminal device after receiving the SN status transfer message, the communication method can delay the time of data communication between the target base station and the terminal device, thereby saving time between the target base station and the terminal device. Transmission resources.
  • the first indication is further used to trigger the source base station to initiate data transfer of the terminal device to the target base station.
  • the communication method further includes: the target base station receives data of the terminal device from the source base station.
  • This implementation manner enables the source base station to initiate data transfer of the terminal device to the target base station only after being triggered by the first instruction, thereby delaying the time point when the source base station initiates data transfer of the terminal device to the target base station, thereby saving the source base station and Transmission resources between target base stations.
  • the sending, by the target base station, the first indication to the source base station includes: receiving, by the target base station, a handover completion message or a reconfiguration completion message from the terminal device; the target base station responds to Sending the first indication to the source base station in the handover complete message or reconfiguration complete message.
  • the sending, by the target base station, the first indication to the source base station includes: the target base station sends the first indication to the source base station in response to the random access preamble. .
  • the present application provides a communication method, the communication method including: a terminal device receiving a handover command from a source base station; the terminal device sending a random access preamble to a target base station; and the terminal device to the source
  • the base station sends a first instruction, and the first instruction is used to trigger the source base station to send a sequence number status transfer message to the target base station.
  • the terminal device sends a first instruction to the source base station, so that the source base station can send an SN status transfer message to the target base station in response to the first instruction, that is, transmission of the SN status transfer message from the source base station to the target base station can be achieved.
  • the terminal device sends the first instruction to the source base station after sending the random access preamble, so that the source base station can send the SN status transfer message to the target base station after the terminal device starts random access. Because the target base station only performs data communication with the terminal device after receiving the SN status transfer message, the communication method can delay the time of data communication between the target base station and the terminal device, thereby saving time between the target base station and the terminal device. Transmission resources.
  • the first indication is further used to trigger the source base station to initiate data transfer of the terminal device to the target base station.
  • This implementation manner enables the source base station to initiate data transfer of the terminal device to the target base station only after being triggered by the first instruction, thereby delaying the time point when the source base station initiates data transfer of the terminal device to the target base station, thereby saving the source base station and Transmission resources between target base stations.
  • the terminal device sending the first instruction to the source base station includes: the terminal device receiving a random access response message from the target base station device; and responding to the random access response Message, the terminal device sends the first indication to the source base station.
  • the sending, by the terminal device, a first instruction to the source base station includes: receiving, by the terminal device, a contention resolution message from the target base station device; and in response to the contention resolution message, the terminal device The terminal device sends the first instruction to the source base station.
  • the sending, by the terminal device, the first instruction to the source base station includes: receiving, by the terminal device, from the target base station device scrambled using a cell wireless network temporary identifier of the terminal device. Scheduling information; in response to the scheduling information, the terminal device sends the first indication to the source base station.
  • the first indication is carried in a radio resource control message or a media access layer control unit, or the first indication is a physical layer-specific indication.
  • the communication method further includes: the terminal device determines to send uplink data to the source base station or to the target base station according to a stipulation of the communication protocol; or the terminal device receives the first data from the source base station or the target base station. Two instructions, and determining to send uplink data to the source base station or to the target location in response to the second instruction; or the terminal device is based on the signal quality between the source base station and the terminal device or The signal quality between the target base station and the terminal device is determined to send uplink data to the source base station or to the target base station.
  • an embodiment of the present application provides a communication method.
  • the communication method includes: a core network element receives a modify bearer request message; the core network element sends a first instruction to a source base station, where the first instruction is used to trigger the source base station Send a SN status transfer message to the target base station.
  • the core network element sends a first instruction to the source base station, so that the source base station can send an SN status transfer message to the target base station in response to the first instruction, that is, the SN status transfer message can be realized from the source base station to the target base station. transmission.
  • the core network element sends the first instruction to the source base station after the terminal device completes the random access process, so that the source base station can send the SN status transfer message to the target base station after the terminal device completes random access. Because the target base station only performs data communication with the terminal device after receiving the SN status transfer message, the communication method can delay the time of data communication between the target base station and the terminal device, thereby saving time between the target base station and the terminal device. Transmission resources.
  • the first indication is further used to trigger the source base station to initiate data transfer of the terminal device to the target base station.
  • This implementation manner enables the source base station to initiate data transfer of the terminal device to the target base station only after being triggered by the first instruction, thereby delaying the time point when the source base station initiates data transfer of the terminal device to the target base station, thereby saving the source base station and Transmission resources between target base stations.
  • the first indication may be an end mark.
  • the present application provides a communication device.
  • the communication apparatus includes a module for executing the communication method in the first aspect or any possible implementation manner of the first aspect.
  • the modules included in the communication device may be implemented by software and / or hardware.
  • the communication device may be a base station, or may be a chip capable of being integrated in the base station.
  • the present application provides a communication device.
  • the communication apparatus includes a module for executing the communication method in the second aspect or any one of the possible implementation manners of the second aspect.
  • the modules included in the communication device may be implemented by software and / or hardware.
  • the communication device may be a base station, or may be a chip capable of being integrated in the base station.
  • the present application provides a communication device.
  • the communication device includes a module for executing the communication method in the third aspect or any one of the possible implementation manners of the third aspect.
  • the modules included in the communication device may be implemented by software and / or hardware.
  • the communication device may be a terminal device, or may be a chip capable of being integrated in the terminal device.
  • the present application provides a communication device.
  • the communication apparatus includes a module for executing the communication method in the fourth aspect or any one of the possible implementation manners of the fourth aspect.
  • the modules included in the communication device may be implemented by software and / or hardware.
  • the communication device may be a core network element, or may be a chip capable of being integrated in the core network element.
  • the present application provides a computer-readable storage medium.
  • the computer-readable storage medium stores program code for execution by a communication device.
  • the program code includes instructions for executing the communication method in the first aspect or any one of the possible implementation manners of the first aspect.
  • the present application provides a computer-readable storage medium.
  • the computer-readable storage medium stores program code for execution by a communication device.
  • the program code includes instructions for performing the second aspect or the communication method in any one of the possible implementation manners of the second aspect.
  • the present application provides a computer-readable storage medium.
  • the computer-readable storage medium stores program code for execution by a communication device.
  • the program code includes instructions for performing the third aspect or the communication method in any one of the possible implementation manners of the third aspect.
  • the present application provides a computer-readable storage medium.
  • the computer-readable storage medium stores program code for execution by a communication device.
  • the program code includes instructions for executing the communication method in the fourth aspect or any one of the possible implementation manners of the fourth aspect.
  • the present application provides a computer program product containing instructions.
  • the computer program product runs on a communication device, the communication device is caused to implement the communication method in the first aspect or any possible implementation manner of the first aspect.
  • the present application provides a computer program product containing instructions.
  • the computer program product runs on a communication device, the communication device is caused to implement the communication method in the second aspect or any possible implementation manner of the second aspect.
  • the present application provides a computer program product containing instructions.
  • the computer program product runs on a communication device, the communication device is caused to implement the third aspect or the communication method in any possible implementation manner of the third aspect.
  • the present application provides a computer program product containing instructions.
  • the computer program product runs on a communication device, the communication device is caused to implement the fourth aspect or the communication method in any possible implementation manner of the fourth aspect.
  • FIG. 1 is a schematic architecture diagram of a communication system to which a communication method according to an embodiment of the present application can be applied;
  • FIG. 1 is a schematic architecture diagram of a communication system to which a communication method according to an embodiment of the present application can be applied;
  • FIG. 2 is a schematic flowchart of a handover process to which a communication method according to an embodiment of the present application can be applied;
  • FIG. 3 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 4 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 5 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 8 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a protocol stack according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a communication device according to another embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a communication device according to another embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of a communication device according to another embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of a communication device according to another embodiment of the present application.
  • LTE system LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), fifth in the future 5th generation (5G) system or a new wireless (NR) system, a separate communication system between a central unit (CU) and a distributed unit (DU), or two or more of the above systems in common Composed of communication systems, etc.
  • FDD frequency division duplex
  • TDD time division duplex
  • 5G fifth in the future 5th generation
  • NR new wireless
  • CU central unit
  • DU distributed unit
  • the UE in this embodiment of the present application may refer to a terminal device, an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user Device.
  • the UE can also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital processing (PDA), and a wireless communication function.
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital processing
  • Handheld devices, computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearables, flight-capable devices (such as drones, hot air balloons), terminal devices in future 5G networks, or public utilities that are evolving in the future Terminal devices and the like in a land mobile communication network (PLMN) are not limited in this embodiment of the present application.
  • the base station (for example, an access point) in this embodiment of the present application may refer to a device in an access network that communicates with a terminal device through one or more sectors on an air interface.
  • the base station may be an evolved base station (evolutional NodeB, eNB, or eNodeB) in the LTE system, or the network device may be a gNB in a future 5G system or an NR system, and the embodiment of the present application is not limited.
  • the core network element in the embodiment of the present application may include a serving gateway (SGW) or a user plane function (UPF) network element.
  • SGW serving gateway
  • UPF user plane function
  • FIG. 1 is an exemplary architecture diagram of a communication system according to an embodiment of the present application.
  • the method in the embodiment of the present application can be applied to the communication system shown in FIG. 1.
  • a communication system to which the methods of the embodiments of the present application can be applied may include more or fewer network elements or devices.
  • the device or network element in FIG. 1 may be hardware, software divided by functions, or a combination of the two.
  • the devices or network elements in FIG. 1 can communicate with each other through other devices or network elements.
  • the communication system shown in FIG. 1 may include a source base station 110, a target base station 120, and a terminal device 130.
  • the source base station 110, the target base station 120, and the terminal device 130 can communicate with each other.
  • the source base station 110 and the target base station 120 may communicate through an X2 interface or through a core network device, and the target base station 110 and the target base station 120 and the terminal device 130 may communicate through an air interface or a relay device, respectively.
  • the source base station 110 and the target base station 120 may be the same type of network equipment.
  • the source base station 110 and the target base station 120 are eNBs; or the target base station 110 and the target base station 120 may be different types of network equipment.
  • the source base station 110 is an eNB.
  • the target base station 120 is a gNB.
  • the terminal device 130 may switch from the source base station 110 to the target base station 120.
  • a cell where the source base station 110 provides service to the terminal device 130 is called a source cell
  • a cell where the target base station 120 provides service to the terminal device 130 is called a target cell.
  • the source base station and the source cell are interchangeable, and the target base station and the target cell are interchangeable.
  • FIG. 2 shows steps or operations of the switching process, but these steps or operations are merely examples.
  • the embodiment of the present application may also perform other operations or a modification of each operation in FIG. 2, or an embodiment of the present application. It is not necessary to perform all steps or operations in FIG. 2.
  • the source base station configures measurement control information to the terminal device to enable the terminal device to perform measurement to assist the source base station in controlling the mobility function under the connection.
  • the terminal device performs measurement according to the frequency point information configured by the source base station, performs evaluation according to the configured measurement report criteria, and then reports the measurement report to the source base station.
  • the source base station makes a handover judgment according to the measurement report result of the terminal device and some information maintained by the source base station.
  • the source base station transmits the necessary information for handover preparation on the target base station side to the target base station through a Handover Request message.
  • the target base station performs an access permission decision according to quality of service (Qos) information.
  • Qos quality of service
  • the target base station sends a Handover Request Ack message to the source base station.
  • the source base station sends a handover command to the terminal device.
  • This switching command may also be referred to as a switching message.
  • the terminal device sends a random access preamble to the target base station.
  • the target base station sends a random access response message to the terminal device.
  • the terminal device sends a handover completion message to the target base station.
  • the handover completion message may also be called a reconfiguration completion message.
  • the target base station After the target base station receives the handover completion message sent by the terminal device, it can perform data transmission with the terminal device.
  • the target base station switches a confirmation message to the terminal device.
  • the handover confirmation message may also be a contention resolution message.
  • S211 is an optional step.
  • S208 to S211 together may be referred to as a random access process.
  • the target base station sends a Path Switch Request (Path Switch Request) message to a mobility management entity (MME).
  • Path Switch Request Path Switch Request
  • MME mobility management entity
  • S213 The MME sends a Modify Bearer Request message to a serving gateway (SGW).
  • SGW serving gateway
  • the SGW switches paths. For example, the SGW switches the downlink path.
  • the SGW sends an end marker (End Marker) to the source base station.
  • End Marker End Marker
  • the source base station sends an end mark to the target base station.
  • the SGW sends a Modify Bearer Response (Modify Bearer Response) message to the MME.
  • Modify Bearer Response Modify Bearer Response
  • the MME sends a Path Switch Request Acknowledgement (Path Switch Request Ack) message to the target base station.
  • Path Switch Request Ack Path Switch Request Acknowledgement
  • the target base station sends a terminal device context release message to the source base station.
  • the source base station releases resources used for communication with the terminal device.
  • the terminal device can be connected to the target base station and the target base station at the same time. For example, even after the terminal device sends the random access preamble to the source base station, the connection between the terminal device and the source base station is not interrupted during the random access process with the target base station.
  • the terminal device can perform data transmission with the source base station and the target base station at the same time.
  • the terminal device During the handover of the terminal device from the source base station to the target base station, if the terminal device is connected to both the source base station and the target base station, when does the source base station initiate data transfer of the terminal device to the target base station and send an SN status transfer message to the target base station.
  • the source base station may initiate data transfer of the terminal device to the target base station and send an SN status transfer message to the target base station immediately after sending the handover command to the terminal device.
  • the data forwarding may include uplink data forwarding, or downlink data forwarding, or both uplink data forwarding and downlink data forwarding.
  • the downlink data forwarding may include forwarding of a downlink packet data convergence protocol (PDCP) packet data unit (PDUCP) that the source base station has sent to the terminal device but has not successfully transmitted. Or, the source base station does not allocate a serial number (serial number, SN), and forwards new data from the core network, or forwards the PDCP PDU and the new data.
  • PDCP packet data convergence protocol
  • PDUCP packet data unit
  • the uplink data forwarding may include: forwarding of an uplink PDCP service data unit (SDU) that is not sent by the source base station to the core network device.
  • SDU uplink PDCP service data unit
  • the specific procedure for the source base station to send the data forwarding of the terminal device to the target base station may refer to the procedures in the prior art, and is not repeated here.
  • the SN status transfer message may include indication information used to indicate a serial number status of data that the source base station does not send to the terminal device, and data used to indicate that the source base station has sent to the terminal device but did not send the data successfully.
  • indication information used to indicate a serial number status of data that the source base station does not send to the terminal device
  • data used to indicate that the source base station has sent to the terminal device but did not send the data successfully.
  • the SN status transfer message may include indication information for indicating a count (count or SN) value that the target base station should allocate to the first new data packet downstream of the terminal device, and / or may include indication information for indicating the Indication information of the count value of the first unsuccessful data packet uplinked by the terminal device, and / or bitmap information of subsequent successful and unsuccessful data packet transmissions, where bit "1" indicates successful transmission, The bit "0" indicates that the transmission was unsuccessful.
  • the SN status transfer message may include indication information (the SN of the first PDCP PDU that needs to be sent) indicating the sequence number status of the data that the source base station did not send to the terminal device, and And / or indication information used to indicate a status of a sequence number of data that the source base station has transmitted to the terminal device but has not successfully transmitted.
  • the SN status transfer message may include indication information used to indicate a serial number SN status of the data received by the source base station from the terminal device.
  • the SN state transfer message may include indication information for indicating the sequence number status of the data that the source base station did not send to the terminal device and for indicating the source base station At least one item of indication information of the serial number status of the data that has been sent to the terminal device but has not been successfully transmitted, and may include indication information that is used to indicate the status of the serial number SN of the data received by the source base station from the end device.
  • the source base station immediately initiates the terminal device's data forwarding and sends the SN status transfer message to the target base station after sending the handover command to the terminal device, after receiving the data and the SN status transfer message forwarded by the source base station, It may send downlink data to the terminal device and / or send uplink data of the terminal device to the core network device.
  • the source base station can still send downlink data to the terminal device, so the source base station sends the handover command to the terminal device. Then, it is not necessary to immediately send an SN status transfer message to the target base station, so that the target base station can send data received from the source base station to the terminal device according to the SN status transfer message.
  • the source base station can still receive uplink data from the terminal device after sending the handover command to the terminal device, the source base station sends an SN status transfer message to the target base station immediately after sending the handover command to the terminal device, so that the target base station It is not necessary to receive uplink data from the terminal device according to the SN status transfer message.
  • the source base station After the source base station sends a handover command to the terminal device, it immediately sends an SN status transfer message to the target base station, which will cause a waste of transmission resources between the target base station and the terminal device.
  • this application proposes a new communication method, which can delay the time point when the source base station sends the SN status transfer message to the target base station, thereby reducing the transmission between the target base station and the terminal device. Waste of resources.
  • FIG. 3 is a schematic flowchart of a communication method according to an embodiment of the present application. It should be understood that FIG. 3 shows steps or operations of the communication method, but these steps or operations are merely examples. The embodiment of the present application may also perform other operations or a modification of each operation in FIG. 3, or an embodiment of the present application. It is not necessary to perform all steps or operations in FIG. 3.
  • the source base station sends a handover request message to the target base station. Accordingly, the target base station receives a handover request message from the source base station.
  • the handover request message is used to apply for access resources of the terminal device from the target base station, and provides configuration information of the terminal device.
  • this step may be S204 in the handover process shown in FIG. 2.
  • the terminal device sends and receives a random access preamble to the target base station. Accordingly, the target base station receives a random access preamble from the terminal device.
  • the random access preamble refers to a preset sequence.
  • this step may be S208 in the handover process shown in FIG. 2.
  • steps S310 to S320 may include steps that are the same as or similar to at least one of steps S205 to S207.
  • the target base station sends a first instruction to the source base station, where the first instruction is used to trigger the source base station to send an SN status transfer message to the target base station. Accordingly, the source base station receives the first indication from the target base station.
  • the target base station may send the first indication to the source base station at any time after receiving the random access preamble sent by the terminal device and before sending the path switching request message to the core network element.
  • the path conversion request message is used to establish a data channel between the target base station and the core network element.
  • the target base station may send a first instruction to the source base station at any time between S208 and S212.
  • the target base station may send a first indication to the source base station in response to the random access preamble.
  • the target base station may immediately send a first indication to the source base station.
  • the random access response message is used to confirm that the base station receives the random access preamble.
  • the target base station may send a first indication to the source base station in response to the handover completion message or the reconfiguration completion message.
  • the handover complete message indicates that the UE has completed the handover configuration.
  • the target base station may immediately send a first indication to the source base station.
  • the handover confirmation message or the contention resolution message is used to confirm to the terminal device that the target base station has received the handover completion message sent by the terminal device.
  • the target base station may send the first indication to the source base station through the X2 interface.
  • a dedicated message may be added between the target base station and the source base station, and the first message may be carried in the dedicated message.
  • the target base station can send the first indication to the source base station by sending the dedicated message to the source base station.
  • the source base station sends a SN status transfer message of the terminal device to the target base station in response to the first instruction. Accordingly, the target base station receives the SN status transfer message from the source base station.
  • the target destination base station may determine the SN or count number corresponding to the first downlink data packet that needs to be sent to the terminal device according to the indication information included in the SN status transition message.
  • the target destination base station may determine that it needs to receive from the terminal device according to the indication information included in the SN status transition message.
  • the target base station After the target base station determines the SN or count number of the data of the terminal device, it transmits the data to the terminal device.
  • the target base station determines the SN or count number of the data of the terminal device according to the SN status transfer message, and the implementation manner of data communication with the terminal device according to the SN or count number. For related implementations in the prior art, reference is not made here. To repeat.
  • the communication method shown in FIG. 3 can be summarized as follows: after the terminal device starts a random access process for the target base station, the target base station sends a first instruction to the source base station, and the source base station is triggered by the first instruction Send the SN status transfer message of the terminal device to the target base station.
  • This communication method enables the source base station to the target base station to send the SN status transfer message of the terminal device to the target base station after the terminal device starts a random access process for the target base station.
  • the source base station sends the SN status transfer message to the target base station immediately after sending the handover command to the terminal device.
  • the time point for data communication between the target base station and the terminal device is delayed, and therefore, waste of transmission resources between the target base station and the terminal device can be reduced.
  • FIG. 4 is a schematic flowchart of a communication method according to another embodiment of the present application. It should be understood that FIG. 4 illustrates steps or operations of the communication method, but these steps or operations are merely examples. The embodiment of the present application may also perform other operations or a modification of each operation in FIG. 4, or an embodiment of the present application It is not necessary to perform all steps or operations in FIG. 4.
  • the source base station sends a handover command to the terminal device. Accordingly, the terminal device receives a handover command from the source base station.
  • the handover command is used to provide configuration information of the target cell.
  • this step may be S207 in the handover procedure shown in FIG. 2.
  • the terminal device sends a random access preamble to the target base station. Accordingly, the target base station receives a random access preamble from the terminal device.
  • this step may be S208 in the handover process shown in FIG. 2.
  • steps S410 to S420 may include the same or similar steps as at least one of steps S205 to S207.
  • the terminal device sends a first instruction to the source base station, where the first instruction is used to trigger the source base station to send an SN status transfer message to the target base station. Accordingly, the source base station receives the first indication from the terminal device.
  • the terminal device may immediately send a first indication to the source base station.
  • the terminal device may send a first indication to the source base station in response to the random access response message.
  • the terminal device may immediately send a first indication to the source base station.
  • the terminal device may send a first indication to the source base station in response to the handover confirmation message or the contention resolution message.
  • the handover confirmation message or the contention resolution message is used to confirm to the terminal device that the target base station has received the handover completion message sent by the terminal device.
  • the terminal device after receiving, from the target base station, the terminal device using the cell radio network temporary identifier (C-RNTI) scrambled scheduling information of the terminal device, it can respond to the scheduling information to the source
  • the base station sends a first indication.
  • C-RNTI cell radio network temporary identifier
  • the terminal device may send a dedicated message to the source base station, where the dedicated message carries the first indication.
  • the special message may be called a forwarding request message or an access confirmation message, and the specific name is not limited.
  • This dedicated message can be transmitted over the air interface.
  • the first indication may be carried in an RRC message or a media access control (MAC) control element (CE), or the first indication may be a physical layer-specific indication.
  • MAC media access control
  • CE control element
  • the source base station sends a SN status transfer message of the terminal device to the target base station in response to the first instruction. Accordingly, the target base station receives the SN status transfer message from the source base station.
  • the target destination base station may determine the SN or count number corresponding to the first downlink data packet that needs to be sent to the terminal device according to the indication information included in the SN status transition message.
  • the target destination base station may determine that it needs to receive from the terminal device according to the indication information included in the SN status transition message.
  • the target base station After the target base station determines the SN or count number of the data of the terminal device, it transmits the data to the terminal device.
  • the target base station determines the SN or count number of the data of the terminal device according to the SN status transfer message, and the implementation manner of data communication with the terminal device according to the SN or count number. For related implementations in the prior art, reference is not made here To repeat.
  • the communication method shown in FIG. 4 can be summarized as follows: after the terminal device starts a random access process for the target base station, the terminal device sends a first instruction to the source base station, and the source base station is triggered by the first instruction Send the SN status transfer message of the terminal device to the target base station.
  • This communication method enables the source base station to the target base station to send the SN status transfer message of the terminal device to the target base station after the terminal device starts a random access process for the target base station.
  • the source base station sends the SN status transfer message to the target base station immediately after sending the handover command to the terminal device.
  • the time point for data communication between the target base station and the terminal device is delayed, and therefore, waste of transmission resources between the target base station and the terminal device can be reduced.
  • FIG. 5 is a schematic flowchart of a communication method according to another embodiment of the present application. It should be understood that FIG. 5 shows the steps or operations of the communication method, but these steps or operations are merely examples. The embodiment of the present application may also perform other operations or a modification of each operation in FIG. 5, or an embodiment of the present application. It is not necessary to perform all steps or operations in FIG. 5.
  • the core network element receives a bearer modification request message.
  • the bearer modification request message is used to establish a data channel between the core network element and the target base station.
  • An example of the core network element is an SGW.
  • SGW can also be another network element or device with functions similar to the SGW, which is not limited in the embodiment of the present application.
  • An example of this step is S213 in the handover procedure shown in FIG. 2.
  • the core network element sends a first instruction to the source base station, and the first instruction is used to trigger the source base station to send an SN status transfer message to the target base station.
  • the source base station receives the first indication from the core network element.
  • the core network device may send a dedicated message to the source base station, where the dedicated message carries the first indication.
  • the specific name of the private message is not limited.
  • the first indication may be an end marker.
  • the data packet carrying the end tag usually does not contain data, and the header of the GPRS Tunneling Protocol (GPRS) protocol (GTP) tunnel indicates that the data packet is an end tag data packet.
  • GPRS GPRS Tunneling Protocol
  • GTP GPRS Tunneling Protocol
  • the end tag or end tag data packet is used to indicate the end of data transmission on the corresponding GTP tunnel.
  • GPRS is an abbreviation for General Packet Radio Service.
  • the source base station sends a SN status transfer message of the terminal device to the target base station in response to the first instruction. Accordingly, the target base station receives the SN status transfer message from the source base station.
  • the target destination base station may determine the SN or count number corresponding to the first downlink data packet that needs to be sent to the terminal device according to the indication information included in the SN status transition message.
  • the target destination base station may determine that it needs to receive from the terminal device according to the indication information included in the SN status transition message.
  • the target base station After the target base station determines the SN or count number of the data of the terminal device, it transmits the data to the terminal device.
  • the target base station determines the SN or count number of the data of the terminal device according to the SN status transfer message, and the implementation manner of data communication with the terminal device according to the SN or count number. For related implementations in the prior art, reference is not made here. To repeat.
  • the communication method shown in FIG. 5 can be summarized as follows: after the terminal device completes the random access process for the target base station, the core network element sends a first instruction to the source base station, and the source base station Send the SN status transfer message of the terminal device to the target base station under the trigger.
  • This communication method enables the source base station to send the SN status transfer message of the terminal device to the target base station after the terminal device completes the random access procedure for the target base station.
  • the source base station sends the SN status transfer message to the target base station immediately after sending the handover command to the terminal device.
  • the time point for data communication between the target base station and the terminal device is delayed, and therefore, waste of transmission resources between the target base station and the terminal device can be reduced.
  • the source base station after the source base station sends a handover command to the terminal device, it can immediately initiate data transfer of the terminal device to the target base station.
  • the source base station may also initiate data forwarding of the terminal device to the target base station at other times, and the embodiment of this application does not limit the time when the source base station initiates data forwarding of the terminal device.
  • the first indication may also be used to trigger the source base station to initiate data forwarding of the terminal device to the target base station.
  • the source base station may initiate data transfer of the terminal device to the target base station.
  • the communication method may further include S350.
  • the source base station initiates terminal device data to the target base station. Forward.
  • the source base station initiates data forwarding of the terminal device after the terminal device starts to access the target base station. This is compared with the point in time when the source base station initiates data forwarding of the terminal device to the target base station immediately after the handover command is sent to the terminal device. Waste of transmission resources between target base stations.
  • the communication method may further include S450.
  • the source base station initiates data of the terminal device to the target base station. Forward.
  • FIG. 7 is not limited to the execution order between S440 and S450.
  • the source base station initiates data forwarding of the terminal device after the terminal device starts to access the target base station. This is compared with the point in time when the source base station initiates data forwarding of the terminal device to the target base station immediately after the handover command is sent to the terminal device. Waste of transmission resources between target base stations.
  • the communication method may further include S540.
  • the source base station initiates a terminal device to the target base station. Data forwarding.
  • FIG. 8 the same reference numerals in FIG. 8 as those in FIG. 5 represent the same or similar meanings, and for the sake of brevity, they are not repeated here.
  • the communication method shown in FIG. 8 is not limited to the execution order between S530 and S540.
  • the source base station initiates data forwarding of the terminal device after the terminal device accesses the target base station. This is compared with the point in time when the source base station initiates data forwarding of the terminal device to the target base station immediately after the handover command is sent to the terminal device. Waste of transmission resources between target base stations.
  • two sets of protocol stacks can be established, one set corresponding to the source base station and the other set corresponding to the target base station.
  • the same data of the terminal device can be sent only through one of the two sets of protocol stacks, or can be sent through the two sets of protocol stacks.
  • FIG. 9 An example of two sets of protocol stacks established on a terminal device is shown in FIG. 9.
  • the protocol stack on the source base station includes sublayer 1, sublayer 2, radio link control (RLC) layer, and MAC layer
  • the protocol stack on the target base station includes sublayer 2 and RLC layer Same as the MAC layer
  • the protocol stack corresponding to the source base station on the terminal device is the same as the protocol stack on the source base station
  • the protocol stack corresponding to the target base station on the terminal device is the same as the protocol stack on the target base station.
  • sublayer 1 is used for reordering data packets, assigning SN to data packets, and discarding duplicate data packets; sublayer 2 is used for encrypting, decrypting, unpacking or grouping data packets, and can also be used to ensure Data packet integrity.
  • sublayer 1 may also be referred to as a packet data convergence protocol (PDCP) reordering layer
  • sublayer 2 may also be referred to as a PDCP sublayer.
  • PDCP packet data convergence protocol
  • the PDCP sublayer 1 can also be deployed at the target base station, and the PDCP sublayer 1 on the terminal device can be regarded as a common part of the two sets of protocol stacks.
  • the present application also proposes a communication method of how the terminal device sends uplink data.
  • the terminal device may send uplink data only to the source base station or only to the target base station.
  • This communication method may be referred to as a one-sided transmission mode.
  • the terminal device may send uplink data to the source base station and the target base station. Specifically, a part of the uplink data of the terminal device is sent to the source base station, and another part of the data is sent to the target base station.
  • This communication method may be referred to as a two-sided transmission mode.
  • the terminal device may send uplink data to the source base station and the target base station. Specifically, the same data is sent to both the source base station and the target base station.
  • This communication method may be referred to as a repeat transmission mode.
  • the terminal device sends the same PDCP SDU to both the source base station and the target base station.
  • the terminal device determines whether to use the single-sided transmission mode, the double-sided transmission mode, or the repeated transmission mode according to the provisions of the protocol. In the case where the terminal device determines to use the unilateral transmission mode according to the protocol, further, the terminal device can determine whether to send uplink data to the source base station or uplink data to the target base station according to the protocol.
  • the terminal device may receive a second instruction from the network-side device, where the second instruction is used to instruct the terminal device to use a unilateral transmission mode, a bilateral transmission mode, or a repeated transmission mode.
  • the second instruction may be specifically used to instruct the terminal device to send uplink data to the source base station or the target base station.
  • the network-side device that sends the second instruction to the terminal device may be a source base station or a target base station.
  • the terminal device may use a single-side transmission mode, a double-side transmission mode, or a repeated transmission mode according to a signal condition between the source base station and the terminal device or a signal condition between the target base station and the terminal device.
  • the terminal device determines to use the unilateral transmission mode, specifically, the terminal device determines to send uplink data to the source base station or to the target base station.
  • the terminal device may measure the downlink signal sent by the source base station and the downlink signal sent by the target base station. If the reference signal receiving power (RSRP) of one network device in the source base station and the target base station is higher than the RSRP of the other network device, the terminal device selects a unilateral transmission mode and selects a network with better RSRP The device sends uplink data.
  • RSRP reference signal receiving power
  • the terminal device selects a unilateral transmission mode and selects to RSRP.
  • Network equipment sends uplink data.
  • the terminal device selects a unilateral transmission mode and sends uplink data to the target base station.
  • the terminal device selects a two-sided transmission mode if the difference between the RSRP of one network device and the RSRP of another network device in the source base station and the target base station is less than a preset second threshold.
  • the terminal device selects a two-sided transmission mode if the RSRP of the downlink signal sent by the target base station is 2 dB lower than the RSRP of the downlink signal sent by the source base station.
  • the terminal device selects a repeat transmission mode to improve the reliability of data transmission.
  • the terminal device Can use repeated sending.
  • FIG. 10 is a schematic structural diagram of a communication device according to an embodiment of the present application. It should be understood that the communication device 1000 shown in FIG. 10 is merely an example, and the communication device in the embodiment of the present application may further include other modules or units, or include modules similar in function to each module in FIG. All modules in 10.
  • the communication device 1000 shown in FIG. 10 may include a receiving module 1010 and a transmitting module 1020. Each module included in the communication device 1000 may be implemented in software and / or hardware.
  • the communication device 1000 may be configured to perform the steps performed by the target base station in the communication method described in FIG. 3 or FIG. 6.
  • the receiving module 1010 is configured to receive a handover request message from a source base station and the random access preamble from a terminal device; the sending module 1020 is configured to send a first instruction to the source base station, where the first instruction is used to trigger The source base station sends a serial number status transfer message to the communication device; the receiving module 1010 is further configured to receive the serial number status transfer message from the source base station.
  • the first indication is further used to trigger the source base station to initiate data transfer of the terminal device to the communication device.
  • the receiving module 1010 is further configured to receive data of the terminal device from the source base station.
  • the receiving module 1010 is specifically configured to receive a handover completion message or a reconfiguration completion message from the terminal device.
  • the sending module 1020 is specifically configured to send the first indication to the source base station in response to the handover completion message or reconfiguration completion message.
  • the sending module 1020 is specifically configured to send the first indication to the source base station in response to the random access preamble.
  • FIG. 11 is a schematic structural diagram of a communication device according to an embodiment of the present application. It should be understood that the communication device 1100 shown in FIG. 11 is merely an example, and the communication device in the embodiment of the present application may further include other modules or units, or include modules similar in function to each module in FIG. All modules in 11.
  • the communication device 1100 shown in FIG. 11 may include a receiving module 1110 and a sending module 1120. Each module included in the communication device 1100 may be implemented in software and / or hardware.
  • the communication device 1100 may be configured to perform steps performed by a terminal device in the communication method described in FIG. 4 or FIG. 7.
  • the receiving module 1110 is configured to receive a handover command from the source base station; the sending module 1120 is configured to send a random access preamble to the target base station; the sending module 1120 is further configured to send a first instruction to the source base station, An indication is used to trigger the source base station to send a sequence number status transfer message to the target base station.
  • the first indication is further used to trigger the source base station to initiate data forwarding of the communication device to the target base station.
  • the receiving module 1110 is specifically configured to receive a random access response message from the target base station device.
  • the sending module 1120 is specifically configured to send the first indication to the source base station in response to the random access response message.
  • the receiving module 1110 is specifically configured to receive a contention resolution message from the target base station device.
  • the sending module 1120 is specifically configured to send the first indication to the source base station in response to the contention resolution message.
  • the receiving module 1110 is specifically configured to receive, from the target base station device, scheduling information scrambled using a cell wireless network temporary identifier of the terminal device.
  • the sending module 1120 is specifically configured to send the first indication to the source base station in response to the scheduling information.
  • the sending module 1120 is further configured to: send uplink data to the source base station or to the target base station according to a communication protocol; or according to a second instruction received from the source base station or the target base station , Sending uplink data to the source base station or to the target base station; or determining a destination based on a signal quality between the source base station and the communication device or a signal quality between the target base station and the communication device
  • the source base station sends uplink data to the target base station.
  • FIG. 12 is a schematic structural diagram of a communication device according to an embodiment of the present application. It should be understood that the communication device 1200 shown in FIG. 12 is merely an example. The communication device in the embodiment of the present application may further include other modules or units, or include modules similar in function to each module in FIG. All modules in 12.
  • the communication device 1200 shown in FIG. 12 may include a sending module 1210 and a receiving module 1220. Each module included in the communication device 1200 may be implemented in software and / or hardware.
  • the communication device 1200 may be configured to perform the steps performed by the source base station in the communication method described in any one of FIG. 2 to FIG. 8.
  • the sending module 1210 is configured to send a handover command to a terminal device; the receiving module 1220 is configured to receive a first instruction from the terminal device, a target base station, or a core network element; the sending module 1210 is further configured to: respond to the A first instruction is to send a sequence number status transfer message to the target base station.
  • the sending module 1210 is further configured to: in response to the first instruction, initiate data forwarding of the terminal device to the target base station.
  • the receiving module 1220 is specifically configured to: after the terminal device completes a random access procedure for the target base station, receive the data from the terminal device, the target base station, or the core network element The first instruction is described.
  • the first instruction is carried in a radio resource control message or a media access layer control unit, or the first instruction is Physical layer-specific instructions.
  • the communication device 1200 when the communication device 1200 receives the first instruction from the core network element, the first instruction is an end character.
  • FIG. 13 is a schematic structural diagram of a communication device according to an embodiment of the present application. It should be understood that the communication device 1300 shown in FIG. 13 is only an example, and the communication device in the embodiment of the present application may further include other modules or units, or include modules similar in function to each module in FIG. All modules in 13.
  • the communication device 1300 shown in FIG. 13 may include a receiving module 1310 and a transmitting module 1320. Each module included in the communication device 1300 may be implemented in software and / or hardware.
  • the communication device 1300 may be configured to perform steps performed by a core network element in the communication method described in FIG. 5 or FIG. 8.
  • the receiving module 1310 is configured to receive a bearer modification request message; the sending module 1320 is configured to send a first instruction to the source base station, and the first instruction is used to trigger the source base station to send an SN status transfer message to the target base station.
  • the first indication is further used to trigger the source base station to initiate data transfer of the terminal device to the target base station.
  • the first indication may be an end mark.
  • FIG. 14 is a schematic structural diagram of a communication device according to an embodiment of the present application. It should be understood that the communication device 1400 shown in FIG. 14 is merely an example, and the communication device in the embodiment of the present application may further include other modules or units, or include modules similar in function to each module in FIG. All modules in 14.
  • the communication device 1400 includes a processor 1410 for executing program instructions.
  • the communication device 1400 may further include a memory for storing program instructions executed by the processor.
  • the processor 1410 executes program instructions to implement operations implemented by the target base station in the communication method described in FIG. 3 or FIG. 6.
  • the processor when the processor executes the program instructions, it can realize: receiving a handover request message from a source base station; receiving a random access preamble from a terminal device; and sending a first instruction to the source base station, where the first instruction is used to trigger the
  • the source base station sends a serial number status transfer message to the communication device; and receives the serial number status transfer message from the source base station.
  • the first indication is further used to trigger the source base station to initiate data transfer of the terminal device to the communication device.
  • the processor further implements: receiving data of the terminal device from the source base station.
  • the processor specifically implements: receiving a handover complete message or a reconfiguration complete message from the terminal device; and sending the first indication to the source base station in response to the handover complete message or the reconfiguration complete message.
  • the processor specifically implements: in response to the random access preamble, sending the first indication to the source base station.
  • the communication device 1400 may be a base station.
  • the communication device 1400 may further include a receiver and a transmitter.
  • the receiver may be used to perform the “receiving” step performed by the target base station in the communication method described in FIG. 3 or FIG. 6; the transmitter may be used to perform the communication method described in FIG. 3 or FIG. 6, The "send" step performed by the target base station.
  • the communication device 1400 may be a chip capable of being integrated in a base station.
  • the communication device 1400 may further include a communication interface, where the communication interface is used to perform the "receive” step and the "send” step performed by the target base station in the communication method described in FIG.
  • the processor 1410 is configured to execute a program instruction to implement an operation implemented by a terminal device in the communication method described in FIG. 4 or FIG. 7.
  • a processor when a processor executes a program instruction, it can realize: receiving a handover command from a source base station; sending a random access preamble to a target base station; sending a first instruction to the source base station, the first instruction being used to trigger the source The base station sends a sequence number status transfer message to the target base station.
  • the first indication is further used to trigger the source base station to initiate data forwarding of the communication device to the target base station.
  • the processor specifically implements: receiving a random access response message from the target base station device; and sending the first indication to the source base station in response to the random access response message.
  • the processor specifically implements: receiving a contention resolution message from the target base station device; and sending the first indication to the source base station in response to the contention resolution message.
  • the processor specifically implements: receiving, from the target base station device, scheduling information scrambled using a cell wireless network temporary identity of the terminal device; and in response to the scheduling information, sending the source base station to the source base station First instruction.
  • the processor further implements: sending uplink data to the source base station or the target base station according to a stipulation of a communication protocol; or according to a second instruction received from the source base station or the target base station,
  • the source base station sends uplink data to the target base station; or determines to send the uplink data to the target base station according to the signal quality between the source base station and the communication device or the signal quality between the target base station and the communication device
  • the source base station sends uplink data to the target base station.
  • the communication device 1400 may be a terminal device.
  • the communication device 1400 may further include a receiver and a transmitter.
  • the receiver may be used to perform the "receiving" step performed by the terminal device in the communication method described in FIG. 4 or FIG. 7; the transmitter may be used to perform the communication method described in FIG. 4 or FIG. 7, The "send" step performed by the terminal device.
  • the communication device 1400 may be a chip capable of being integrated in a terminal device.
  • the communication device 1400 may further include a communication interface, where the communication interface is used to perform the “receive” step and the “send” step performed by the terminal device in the communication method described in FIG. 4 or FIG. 7.
  • the processor 1410 is configured to execute program instructions to implement operations implemented by a source base station in the communication method described in any one of FIG. 3 to FIG. 8.
  • the processor when it executes a program instruction, it can realize: sending a handover command to a terminal device; receiving a first instruction from the terminal device, a target base station, or a core network element; Send a serial number status transfer message.
  • the processor further implements: in response to the first instruction, initiating data forwarding of the terminal device to the target base station.
  • the processor specifically implements that after the terminal device completes a random access procedure for the target base station, receiving the first terminal device from the terminal device, the target base station, or the core network element An instruction.
  • the first indication is a terminator.
  • the communication device 1400 may be a base station.
  • the communication device 1400 may further include a receiver and a transmitter.
  • the receiver may be used to perform the "receiving" step performed by the source base station in the communication method described in any one of Figs. 3 to 8; the transmitter may be used to perform any of the communication methods described in Figs. 3 to 8 In the communication method described above, the "transmitting" step performed by the source base station.
  • the communication device 1400 may be a chip capable of being integrated in a base station.
  • the communication device 1400 may further include a communication interface, where the communication interface is configured to perform the "receive” step and the "send” step performed by the source base station in the communication method described in any one of FIG. .
  • the processor 1410 is configured to execute a program instruction to implement an operation implemented by a core network element in the communication method described in FIG. 5 or FIG. 8.
  • the processor when the processor executes a program instruction, it may be implemented to: receive a bearer modification request message; and send a first instruction to the source base station, where the first instruction is used to trigger the source base station to send an SN status transfer message to the target base station.
  • the first indication is further used to trigger the source base station to initiate data transfer of the terminal device to the target base station.
  • the first indication may be an end mark.
  • the communication device 1400 may be a core network element, such as an SGW.
  • the communication device 1400 may further include a receiver and a transmitter.
  • the receiver may be used to perform the "receiving" step performed by the target base station in the communication method described in FIG. 5 or FIG. 8.
  • the transmitter may be used to perform the communication method described in FIG. 5 or FIG. 8, The "send" step performed by the target base station.
  • the communication device 1400 may be a chip capable of being integrated in a core network element, for example, it may be a chip capable of being integrated in an SGW.
  • the communication device 1400 may further include a communication interface, where the communication interface is configured to perform the “receive” and “send” steps performed by the target base station in the communication method described in FIG. 5 or FIG. 8.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the unit is only a logical function division.
  • multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, which may be electrical, mechanical or other forms.
  • 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, may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objective of the solution of this embodiment.
  • the functional units in the embodiments of the present application may be integrated into one processing unit, or each of the units may exist separately physically, or two or more units may be integrated into one unit.
  • processors in the embodiment of the present application may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSPs), and application-specific integrated circuits. (application specific integrated circuit (ASIC)), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of this application is essentially a part that contributes to the existing technology or a part of the technical solution can be embodied in the form of a software product.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application.
  • the aforementioned storage media include: U disks, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks or compact discs and other media that can store program codes .

Landscapes

  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de communication et un appareil de communication. Le procédé de communication comprend les étapes suivantes : une station de base source envoie une instruction de transfert à un terminal ; la station de base source reçoit une première instruction du terminal, d'une station de base cible, ou d'un élément de réseau central ; en réponse à la première instruction, la station de base source envoie un message de transfert d'état de numéro de série (SN) à la station de base cible. Le procédé de communication et l'appareil de communication permettent de réaliser l'acheminement d'un message de transfert d'état de SN d'une station de base source vers une station de base cible dans un scénario dans lequel un UE est connecté simultanément aux deux stations de base. Le procédé de communication et l'appareil de communication permettent en outre d'économiser des ressources de transmission.
PCT/CN2018/107811 2018-09-27 2018-09-27 Procédé de communication et appareil de communication Ceased WO2020061871A1 (fr)

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CN201880097980.8A CN112753249A (zh) 2018-09-27 2018-09-27 通信方法和通信装置

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Citations (3)

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Publication number Priority date Publication date Assignee Title
CN102137424A (zh) * 2010-09-03 2011-07-27 华为技术有限公司 切换方法、专网用户设备、接入网设备以及系统
CN106817737A (zh) * 2016-12-22 2017-06-09 电信科学技术研究院 一种利用移动中继进行切换的方法及装置
WO2017166293A1 (fr) * 2016-04-01 2017-10-05 华为技术有限公司 Procédé, dispositif et système de gestion de la mobilité

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Publication number Priority date Publication date Assignee Title
EP2442610B1 (fr) * 2010-10-13 2017-12-06 Alcatel Lucent Livraison en séquence de trafic utilisateur en amont pendant le transfert
CN109219098B (zh) * 2012-08-07 2021-09-14 华为技术有限公司 切换处理方法及基站
EP2833669B1 (fr) * 2013-07-31 2022-06-22 Panasonic Intellectual Property Corporation of America Procédure de transfert dans un système de communication mobile
CN113423124B (zh) * 2016-04-01 2023-10-13 北京三星通信技术研究有限公司 一种支持无缝切换的方法及基站设备

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CN102137424A (zh) * 2010-09-03 2011-07-27 华为技术有限公司 切换方法、专网用户设备、接入网设备以及系统
WO2017166293A1 (fr) * 2016-04-01 2017-10-05 华为技术有限公司 Procédé, dispositif et système de gestion de la mobilité
CN106817737A (zh) * 2016-12-22 2017-06-09 电信科学技术研究院 一种利用移动中继进行切换的方法及装置

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