WO2020030176A1 - 数据传输的方法和设备 - Google Patents

数据传输的方法和设备 Download PDF

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Publication number
WO2020030176A1
WO2020030176A1 PCT/CN2019/100188 CN2019100188W WO2020030176A1 WO 2020030176 A1 WO2020030176 A1 WO 2020030176A1 CN 2019100188 W CN2019100188 W CN 2019100188W WO 2020030176 A1 WO2020030176 A1 WO 2020030176A1
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WO
WIPO (PCT)
Prior art keywords
access network
network device
information
terminal device
data packet
Prior art date
Application number
PCT/CN2019/100188
Other languages
English (en)
French (fr)
Inventor
耿婷婷
张宏平
严乐
晋英豪
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to BR112021002577-4A priority Critical patent/BR112021002577A2/pt
Priority to EP19846533.8A priority patent/EP3836622B1/en
Publication of WO2020030176A1 publication Critical patent/WO2020030176A1/zh
Priority to US17/171,758 priority patent/US11696191B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • 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
    • H04W36/305—Handover due to radio link failure

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a method and device for data transmission.
  • connection failure When a connected terminal device maintains a connection with the source cell or source base station, a connection failure occurs.
  • the terminal device is required to initiate a radio resource control (Radio Resource Control, RRC) re-establishment request in the new or source cell to the target base station.
  • RRC Radio Resource Control
  • the reasons for connection failure can be: radio link failure (RLF), handover failure (HOF), integrity protection check failure, reconfiguration failure, etc.
  • the RRC connection between the terminal device and the target base station needs to be re-established.
  • the embodiments of the present application provide a data transmission method and device, which implements data transmission between a source base station and a target base station during a terminal device and a target base station re-establishment process.
  • an embodiment of the present application provides a data transmission method, including:
  • the first access network device acquires a first message from the second access network device, where the first message is used to request context information of the terminal device;
  • the first access network device is an access network device corresponding to the terminal device before the re-establishment process
  • the second access network device is an access network device corresponding to the terminal device initiating the re-establishment process.
  • the first access network device learns that the terminal device is requesting to establish a connection with the second access network device. That is, it is learned that the terminal device is performing the re-establishment process connection. Therefore, the first access network device sends a data packet to the second access network device, thereby realizing the first access network device and the second access network during the re-establishment process. Data transfer between devices.
  • it also includes:
  • the protocol data unit PDU service receiving information of the second access network device from the second access network device, where the PDU service receiving information includes the second access network device
  • the identification information of the accepted first PDU session and / or the identification information of the rejected second PDU session; the first PDU session and the second PDU session are for the terminal device in the first access network device; PDU session;
  • the sending, by the first access network device to the second access network device, a data packet includes:
  • the first access network device sends the data packet according to the received information of the PDU service.
  • the second access network device sends the identification information of the first PDU session accepted by the second access network device and / or the identification information of the rejected second PDU session to the first access network device, so that the first access network device
  • the network access device sends a data packet corresponding to the first PDU session to the second access network device, and does not send a data packet corresponding to the second PDU session. Therefore, when the second PDU session exists, the first access network can be reduced. A data packet sent by the device to the second access network device, thereby reducing signaling overhead.
  • the PDU service receiving information further includes: identification information of a first quality of service QoS flow accepted by the second access network device and / or identification information of a second QoS flow rejected;
  • the first QoS flow and the second QoS flow are QoS flows corresponding to services of the terminal device on the first access network device.
  • the second access network device sends the identification information of the first QoS flow accepted by the second access network device and / or the identification information of the rejected second QoS flow to the first access network device, so that the first access network device
  • the network access device sends a data packet associated with the first QoS flow to the second access network device. Therefore, when the second QoS flow exists, the number of data packets sent by the first access network device to the second access network device can be reduced. Data packets, thus reducing signaling overhead.
  • the PDU service receiving information further includes: first information and / or second information;
  • the first information includes identification information of a first data bearer DRB that needs data forwarding, and an uplink and / or downlink general packet radio service tunneling protocol GTP channel address corresponding to the first DRB, where the first DRB A DRB corresponding to the service of the terminal device on the first access network device; the second information includes a GTP channel address corresponding to the first PDU session.
  • This design can make the first access network device send a data packet corresponding to the first PDU session to the second access network device according to the GTP channel address corresponding to the first PDU session, so that the first access network device can The GTP channel address, and / or the uplink GTP channel address and / or the downlink GTP channel address corresponding to the DRB, send a data packet carried by the corresponding DRB corresponding to the QoS flow accepted by the second access network device to the second access network device.
  • the method further includes: the first access network device sends transmission status indication information to the second access network device, and the transmission status indication information is used to indicate that the terminal device is in the A transmission status of a data packet of a service of the first access network device;
  • the transmission status indication information includes:
  • DRB identification information length information of the count value of the packet.
  • the second access network device allocates a count value for a next downlink data packet without an assigned count value
  • This design can enable the second access network device to know how to assign a count value to downlink data packets corresponding to the services of the terminal device on the first access network device.
  • the transmission status indication information further includes at least one of the following:
  • the count value of the first uplink data packet that is lost by the first access network device therefore, the second access network device can learn the loss of other uplink data packets according to the count value of the first uplink data packet that is lost Count value
  • the first indication information used to indicate whether the uplink data packet sent by the terminal device was successfully received by the first access network device; therefore, the second access network device can know which uplink data packets have not been accessed by the first Network device successfully received.
  • the first access network device sends the transmission status indication information to the second access network device, so that the second access network device can learn the uplink and / or downlink PDCP data carried by the terminal device in the DRB of the first access device.
  • the transmission status of the packet, or the transmission status of the uplink and / or downlink PDCP data packets carried by the second access network device that needs to be forwarded by the terminal device in the first DRB of the first access network device, so that the terminal Services of the device on the first access network device can continue to be performed normally on the second access network device.
  • an embodiment of the present application provides a data transmission method, including:
  • the second access network device sends a first message to the first access network device, where the first message is used to request context information of the terminal device;
  • the first access network device is an access network device corresponding to the terminal device before the re-establishment process
  • the second access network device is an access network device corresponding to the terminal device initiating the re-establishment process.
  • the first access network device learns that the terminal device is requesting access to the second access device.
  • the network device establishes a connection, that is, the terminal device is informed that the terminal device is undergoing a re-establishment process connection. Therefore, the first access network device can send a data packet to the second access network device, thereby realizing the first access network device and Data transmission between the second access network devices.
  • it also includes:
  • protocol protocol unit PDU service reception information Sending, by the second access network device, protocol protocol unit PDU service reception information to the first access network device, where the PDU service reception information includes an identifier of a first PDU session resource accepted by the second access network device Information and / or identification information of the rejected second PDU session resource; the first PDU session and the second PDU session are PDU sessions of the terminal device in the first access network device.
  • the second access network device sends the identification information of the first PDU session accepted by the second access network device and / or the identification information of the rejected second PDU session to the first access network device, so that the first access network device
  • the network access device sends a data packet corresponding to the first PDU session to the second access network device, and does not send a data packet corresponding to the second PDU session. Therefore, when the second PDU session exists, the first access network can be reduced. A data packet sent by the device to the second access network device, thereby reducing signaling overhead.
  • the PDU service receiving information further includes: identification information of a first quality of service Qos flow accepted by the second access network device and / or identification information of a second Qos flow rejected;
  • the first Qos flow and the second Qos flow are Qos flows corresponding to services of the terminal device on the first access network device.
  • the second access network device sends the identification information of the first QoS flow accepted by the second access network device and / or the identification information of the rejected second QoS flow to the first access network device, so that the first access network device
  • the network access device sends a data packet associated with the first QoS flow to the second access network device. Therefore, when the second QoS flow exists, the number of data packets sent by the first access network device to the second access network device can be reduced. Data packets, thus reducing signaling overhead.
  • the PDU service receiving information further includes: first information and / or second information;
  • the first information includes identification information of a first data bearer DRB that needs data forwarding, and an uplink and / or downlink general packet radio service tunneling protocol GTP channel address corresponding to the first DRB, where the first DRB A DRB corresponding to the service of the terminal device on the first access network device; the second information includes a GTP channel address corresponding to the first PDU session.
  • This design can make the first access network device send a data packet corresponding to the first PDU session to the second access network device according to the GTP channel address corresponding to the first PDU session, so that the first access network device can The GTP channel address, and / or the uplink GTP channel address and / or the downlink GTP channel address corresponding to the DRB, send a data packet carried by the corresponding DRB corresponding to the QoS flow accepted by the second access network device to the second access network device.
  • it also includes:
  • transmission status indication information Acquiring, by the second access network device from the first access network device, transmission status indication information, where the transmission status indication information is used to indicate a data packet for a service of the terminal device on the first access network device Transmission status
  • the transmission status indication information includes:
  • the second access network device allocates a count value for a next downlink data packet without an assigned count value.
  • This design can enable the second access network device to know how to assign a count value to downlink data packets corresponding to the services of the terminal device on the first access network device.
  • the transmission status indication information further includes at least one of the following:
  • the count value of the first uplink data packet that is lost by the first access network device therefore, the second access network device can learn the loss of other uplink data packets according to the count value of the first uplink data packet that is lost Count value
  • the first indication information used to indicate whether the uplink data packet sent by the terminal device is successfully received by the first access network device; therefore, the second access network device can know which uplink data packets have not been successfully received.
  • the first access network device sends the transmission status indication information to the second access network device, so that the second access network device can learn the uplink and / or downlink PDCP data carried by the terminal device in the DRB of the first access device.
  • the transmission status of the packet, or the transmission status of the uplink and / or downlink PDCP data packets carried by the second access network device that needs to be forwarded by the terminal device in the first DRB of the first access network device, so that the terminal Services of the device on the first access network device can continue to be performed normally on the second access network device.
  • an embodiment of the present application provides a data transmission method, including:
  • the terminal device sends a re-establishment request message to the second access network device; the second access network device initiates an access network device corresponding to the terminal device to initiate a re-establishment process;
  • first reset instruction information indicates resetting an uplink packet count value, and deleting a data packet in a first data packet set;
  • the first data packet set is a set composed of downlink data packets received by the terminal device from the first access network device, or the first data packet set is a downlink data packet received by the terminal device from the first access network device and A set of uplink data packets to which a count value has been allocated;
  • the first access network device is an access network device corresponding to the terminal device before the re-establishment process.
  • the terminal device resets an uplink data packet count value according to the first reset instruction information, and deletes a data packet in the first data packet set.
  • the terminal device resets the count value of the uplink data packet and deletes the data packet in the first data packet set, so that the terminal device is accessing the second access network. After the network device re-establishment is completed, services are restarted with the second access network device according to the uplink data packet with the reset count value.
  • an embodiment of the present application provides a data transmission method, including:
  • the second access network device obtains a re-establishment request message from the terminal device
  • the second access network device sends first reset instruction information to the terminal device, where the first reset instruction information indicates resetting an uplink packet count value, and deleting a data packet in the first data packet set, where the first data
  • the packet set is a set of downlink data packets received by the terminal device from the first access network device, or the first data packet set is a downlink data packet received by the terminal device from the first access network device and has been allocated.
  • the second access network device sends second instruction information to the first access network device, and the second instruction information indicates that the first access network device does not send a data packet to the second access network device.
  • the terminal device resets the count value of the uplink data packet and deletes the data packet in the first data packet set according to the first reset instruction information, so that the terminal After the device is re-established with the second access network device, the device restarts the service with the second access network device according to the uplink data packet with the reset count value.
  • an embodiment of the present application provides a data transmission method, including:
  • the first access network device obtains second instruction information from the second access network device, and the second instruction information indicates that the first access network device does not send a data packet to the second access network device.
  • an embodiment of the present application provides a data transmission method, including:
  • the terminal device determines whether the cell initiating the re-establishment request and the cell in which the terminal device detects a connection failure are the same cell;
  • the terminal device If they are not in the same cell, the terminal device resets the count value of the uplink data packet and deletes the data packet in the first data packet set, where the first data packet set is a set composed of the downlink data packets received by the terminal device Or, the first data packet set is a set composed of a downlink data packet received by the terminal device and an uplink data packet to which a count value has been allocated.
  • the terminal device when the terminal device determines that the cell that initiates the re-establishment request and the terminal device detects that the connection failure cell is not the same cell, the terminal device resets the count value of the uplink data packet and deletes the data packet in the first data packet set That is, at this time, the terminal defaults that the second access network device does not support data transmission; in this way, after the terminal device is re-established with the second access network device, the uplink data packet and the second access network device are reset according to the reset count value. Do business again.
  • an embodiment of the present application provides a data transmission device, including a receiving module and a sending module;
  • the receiving module is configured to obtain a first message from a second access network device, where the first message is used to request context information of a terminal device;
  • the sending module is configured to send a data packet to the second access network device
  • the data transmission device is an access network device corresponding to the terminal device before the re-establishment process
  • the second access network device is an access network device corresponding to the terminal device initiating the re-establishment process.
  • the receiving module is further configured to obtain protocol data unit PDU service receiving information from the second access network device, where the PDU service receiving information includes the second access network device receiving Identification information of a first PDU session and / or identification information of a rejected second PDU session; the first PDU session and the second PDU session are PDU sessions of the terminal device at the data transmission device;
  • the sending module is specifically configured to send the data packet according to the received information of the PDU service.
  • the PDU service receiving information further includes: identification information of a first quality of service QoS flow accepted by the second access network device and / or identification information of a second QoS flow rejected;
  • the first QoS flow and the second QoS flow are QoS flows corresponding to services of the terminal device on the data transmission device.
  • the PDU service receiving information further includes: first information and / or second information;
  • the first information includes identification information of a first data bearer DRB that needs data forwarding, and an uplink and / or downlink general packet radio service tunneling protocol GTP channel address corresponding to the first DRB, where the first DRB A DRB corresponding to the service of the terminal device on the first access network device; the second information includes a GTP channel address corresponding to the first PDU session.
  • the sending module is further configured to send transmission status indication information to the second access network device, where the transmission status indication information is used to instruct a terminal device to perform a service on the data transmission device.
  • the transmission status indication information includes:
  • the second access network device allocates a count value for a next downlink data packet without an assigned count value.
  • the transmission status indication information further includes at least one of the following:
  • First indication information used to indicate whether an uplink data packet sent by the terminal device is successfully received by the data transmission device.
  • an embodiment of the present application provides a data transmission device, including: a receiving module and a sending module;
  • a sending module configured to send a first message to a first access network device, where the first message is used to request context information of a terminal device;
  • a receiving module configured to receive a data packet from the first access network device
  • the first access network device is an access network device corresponding to the terminal device before the re-establishment process
  • the data transmission device is an access network device corresponding to the terminal device initiating a re-establishment process.
  • the sending module is further configured to send protocol data unit PDU service receiving information to the first access network device, where the PDU service receiving information includes a first received by the data transmission device. Identification information of a PDU session resource and / or identification information of a rejected second PDU session resource; the first PDU session and the second PDU session are PDU sessions of the terminal device in the first access network device .
  • the PDU service receiving information further includes: identification information of a first quality of service Qos flow accepted by the data transmission device and / or identification information of a second Qos flow rejected; A Qos flow and the second Qos flow are Qos flows corresponding to services of the terminal device on the first access network device.
  • the PDU service receiving information further includes: first information and / or second information; the first information includes identification information of a first data bearer DRB that requires data forwarding, and the first information The uplink and / or downlink general packet radio service tunneling protocol GTP channel address corresponding to a DRB, wherein the first DRB is a DRB corresponding to the service of the terminal device in the first access network device; the first The second information includes a GTP channel address corresponding to the first PDU session.
  • the receiving module is further configured to obtain transmission status indication information from the first access network device, and the transmission status indication information is used to instruct a terminal device on the first access network device.
  • the transmission status indication information includes:
  • the data transmission device assigns a count value to a next downlink data packet without an assigned count value.
  • the transmission status indication information further includes at least one of the following:
  • First indication information used to indicate whether an uplink data packet sent by the terminal device is successfully received by the first access network device.
  • an embodiment of the present application provides a communication device, including:
  • a module, component or circuit for implementing the communication method of the third aspect or
  • a module, component or circuit for implementing the communication method of the sixth aspect is a module, component or circuit for implementing the communication method of the sixth aspect.
  • an embodiment of the present application provides a communication apparatus for implementing the method described in any one of the first aspect, the second aspect, or the third aspect, or the fifth aspect, or the sixth aspect.
  • an embodiment of the present application provides a communication apparatus for implementing the method described in any one of the first aspect, the second aspect, the third aspect, or the fourth aspect, or the fifth aspect, or the sixth aspect.
  • an embodiment of the present application provides a readable storage medium on which a computer program is stored; when the computer program is executed, the first aspect or the second aspect or the third aspect or The method of any one of the fourth aspect or the fifth aspect or the sixth aspect.
  • an embodiment of the present application provides a program product, where the program product includes a computer program, and the computer program is stored in a readable storage medium, and at least one processor of the communication device may be from the readable storage medium.
  • the at least one processor executes the computer program to cause the communication device to implement any one of the first aspect or the second aspect or the third aspect or the fourth aspect or the fifth aspect or the sixth aspect method.
  • FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a protocol stack of a network device according to an embodiment of the present application.
  • FIG. 3 is a first signaling interaction diagram of a data transmission method according to an embodiment of the present application.
  • FIG. 4 is a second signaling interaction diagram of a data transmission method according to an embodiment of the present application.
  • FIG. 5 is a third signaling interaction diagram of a data transmission method according to an embodiment of the present application.
  • FIG. 6 is a fourth signaling interaction diagram of a data transmission method according to an embodiment of the present application.
  • FIG. 7 is a signaling interaction diagram V of a data transmission method according to an embodiment of the present application.
  • FIG. 8 is a sixth signaling interaction diagram of a data transmission method according to an embodiment of the present application.
  • FIG. 9 is a first schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • FIG. 11 is a first schematic structural diagram of a data transmission device according to an embodiment of the present application.
  • FIG. 12 is a second schematic structural diagram of a data transmission device according to an embodiment of the present application.
  • FIG. 13 is a third structural schematic diagram of a data transmission device according to an embodiment of the present application.
  • FIG. 14 is a fourth structural schematic diagram of a data transmission device according to an embodiment of the present application.
  • 15 is a second schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 16 is a third schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present application.
  • the communication system includes a first access network (RAN) device, a second access network device, and a terminal device.
  • RAN access network
  • An access network device is a device that connects terminal devices to a wireless network. It can be an Evolutionary NodeB (eNB or eNodeB) in Long Term Evolution (LTE), or a relay station or access. Points, or base stations in a 5G network, such as transmission and reception points (Transmission and Reception Point, TRP), and controllers are not limited here.
  • the access network device may be a base station (such as gNB) with a CU and DU separation architecture.
  • FIG. 2 is a schematic diagram of a protocol stack of a network device according to an embodiment of the present application.
  • the RAN device may be connected to a core network device (for example, it may be a core network of LTE, or a core network of 5G, etc.).
  • CU and DU can be understood as a division of the base station from the perspective of logical functions.
  • the CU and DU can be physically separate or deployed together. Multiple DUs can share a CU.
  • One DU can also connect multiple CUs (not shown in the figure).
  • the CU and the DU can be connected through an interface, for example, it can be an F1 interface.
  • CU and DU can be divided according to the protocol layer of the wireless network.
  • Radio Resource Control RRC
  • SDAP Service Data Adaptation Protocol
  • PDCP Packet Data Convergence Protocol
  • RLC radio link control
  • MAC media access control
  • PHY physical layer
  • the division of the CU and DU processing functions according to this protocol layer is only an example, and it can also be divided in other ways.
  • the CU or DU can be divided into functions with more protocol layers.
  • the CU or DU can also be divided into partial processing functions with a protocol layer.
  • some functions of the RLC layer and functions of the protocol layer above the RLC layer are set in the CU, and the remaining functions of the RLC layer and the functions of the protocol layer below the RLC layer are set in the DU.
  • the functions of the CU or DU can also be divided according to the type of service or other system requirements. For example, according to the delay division, a function that needs to meet the delay requirement in processing time is set in the DU, and a function that does not need to meet the delay requirement is set in the CU.
  • the CU may also have one or more functions of the core network.
  • One or more CUs can be set centrally and separately.
  • the CU can be set on the network side to facilitate centralized management.
  • the DU can have multiple radio frequency functions, and can also set the radio frequency function remotely.
  • the functions of the CU can be implemented by one entity or by different entities.
  • the functions of the CU can be further divided, for example, the control plane (CP) and the user plane (UP) are separated, that is, the control plane (CU-CP) and the CU user plane (CU-UP) of the CU.
  • CU-CP and CU-UP can be implemented by different functional entities, and the CU-CP and CU-UP can be coupled with the DU to complete the functions of the base station.
  • the CU-CP is responsible for the control plane functions, mainly including RRC and PDCP-C.
  • PDCP-C is mainly responsible for encryption and decryption of control plane data, integrity protection, and data transmission.
  • CU-UP is responsible for user plane functions, mainly including SDAP and PDCP-U.
  • the SDAP is mainly responsible for processing the data of the core network and mapping the data flow to the bearer.
  • PDCP-U is mainly responsible for data plane encryption and decryption, integrity protection, header compression, serial number maintenance, and data transmission.
  • CU-CP and CU-UP are connected through the E1 interface.
  • CU-CP stands for gNB connected to the core network through the Ng interface.
  • CU-UP is connected to DU through F1-U (user plane).
  • F1-C user plane
  • another possible implementation is that PDCP-C is also in CU-UP.
  • Terminal device It can be a wireless terminal device or a wired terminal device.
  • a wireless terminal device can refer to a device with wireless transmitting and receiving functions. It can be deployed on land, including indoor or outdoor, handheld or vehicle; it can also be deployed on the water. (Such as ships, etc.); can also be deployed in the air (such as aircraft, balloons, satellites, etc.).
  • the terminal device may be a mobile phone, a tablet, a computer with a wireless transmitting and receiving function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, or an industrial control device.
  • VR virtual reality
  • AR augmented reality
  • the terminal device may also be referred to as a user equipment (UE).
  • UE user equipment
  • the connection between the terminal device and the source access network device will fail.
  • the terminal device In order to allow the terminal device to continue the business of the source access network device, the terminal device It will re-establish the connection with the target access network device.
  • the process of re-establishing the connection can also be referred to as the re-establishment process or the re-recovery process or the re-activation process.
  • the embodiment of the present application does not limit the name of the process of re-establishing the connection.
  • the connection between the terminal device and the access network device may be an RRC connection between the terminal device and the access network device.
  • the target access network device When the target access network device does not store the context information of the terminal device, the target access network device needs to perform signaling interaction with the source access network device to obtain the context information of the terminal device.
  • the target access network device requests the source access network device to obtain the terminal device context information after the target access network device and the source access network
  • the method of data transmission between devices is described in detail.
  • FIG. 3 is a signaling interaction diagram of a data transmission method according to an embodiment of the present application; as shown in FIG. 3, the method in this embodiment may include:
  • Step S301 The second access network device sends a first message to the first access network device, where the first message is used to request context information of the terminal device;
  • Step S302 The first access network device sends a data packet to the second access network device.
  • the first access network device is an access network device corresponding to the terminal device before the re-establishment process, that is, the first access network device is an access network device where the terminal device fails to connect;
  • the second access network device is the access network device corresponding to the re-establishment process after the connection between the terminal device and the first access network device is disconnected, that is, the access network device that the terminal device requests to establish a connection.
  • step S301 after the connection between the terminal device and the first access network device fails, the terminal device sends a re-establishment request to the second access network device.
  • the second access network device After receiving the re-establishment request sent by the terminal device, the second access network device sends a first message to the first access device, where the first message is used to request context information of the terminal device.
  • the first message may also be used by the first access network device to determine that the terminal device initiated a re-establishment request on the second access network device.
  • the first access network device can learn that the terminal device is requesting to establish a connection with the second access network device, that is, the terminal device is known.
  • the re-establishment process is in progress.
  • the first access network device needs to send data packets of the terminal device on the first access network.
  • the sending of a data packet by the first access network device to the second access network device may occur before the terminal device and the second access network device are re-established, or it may occur on the terminal device.
  • the data packet sent by the first access network device to the second access network device in this embodiment may be a Packet Data Convergence Protocol (PDCP) data packet; the PDCP data packet may be a PDCP protocol data unit (Protocol Data Unit, PDU for short), and / or, PDCP Service Data Unit (Service Data Unit, SDU for short).
  • PDCP Packet Data Convergence Protocol
  • PDU Packet Data Unit
  • SDU Service Data Unit
  • the data packet sent by the first access network device to the second access network device is a data packet of at least part of the services of the terminal device stored on the first access device.
  • the data packet sent by the first access network device to the second access network device includes at least one of a first data packet, a second data packet, and a third data packet.
  • the first data packet may be a data packet sent by a terminal device successfully received by the first access network device, that is, an uplink data packet successfully received by the first access network device; the second data packet may be the first access network.
  • the device allocates a data packet with a count value, that is, a downlink data packet (including a downlink data packet sent by the first access network device and an unsent downlink data packet) allocated to the first access network device, or a second
  • the data packet may be a data packet that is assigned a count value to the first access network device but does not receive a terminal device receiving a successful indication, that is, a downlink that is assigned a count value to the first access network device but does not receive a terminal device receiving a successful indication
  • Data packets including downlink data packets and unsent downlink data packets sent by the first access network device that have not received a terminal receiving success indication, or include downlink data packets not sent by the first access network device
  • third The data packet may be a data packet of an unas
  • the second access network device may support that all or part of the data packets of the services of the terminal device in the first access network device during the re-establishment process are transmitted to the second access network device.
  • FIG. 4 is a second signaling interaction diagram of a data transmission method according to an embodiment of the present application; as shown in FIG. 4, the method in this embodiment may include:
  • Step S401 The second access network device sends a first message to the first access network device, where the first message is used to request context information of the terminal device;
  • Step S402 The first access network device sends a first response message to the second access network device, and the first response message includes context information of the terminal device;
  • Step S403 The second access network device sends PDU service reception information to the first access network device.
  • Step S404 The first access network device sends a data packet to the second access network device.
  • the first access network device sends transmission status indication information to the second access network device, and the transmission status indication information instructs the terminal device to transmit a data packet corresponding to the service of the first access device. status.
  • step S401 in this embodiment refers to step S301 in the previous embodiment, which is not repeated in this embodiment.
  • step S402 after receiving the first message sent by the second access network device and requesting context information of the terminal device, the first access network device sends the first access network device to the second access network device.
  • the access network device sends a first response message.
  • the first response message carries context information of the terminal device.
  • the context information of the terminal device includes PDU session resource information of the terminal device in the first access network device, and the PDU session resource information may include the following information: the identity of the PDU session and the quality of service corresponding to the PDU session (Quality of Service, Qos) flow identification; further, the PDU session resource information may further include: a mapping relationship between a DRB identification and a Qos flow identification.
  • Each PDU session corresponds to at least one DRB.
  • Each DRB can carry uplink and / or downlink data packets.
  • Each DRB corresponds to at least one Qos flow.
  • the second access network device may send the PDU service receiving information to the first access network device according to the PDU session resource information in the context information of the terminal device.
  • the second access network device receives the first response message sent by the first access network device, and sends the first response message to the first access device according to the PDU session resource information in the context information of the terminal device in the first response message.
  • Network equipment sends PDU service reception information.
  • the second access network device determines which PDU sessions of the terminal device on the first access network device can be accepted or rejected according to the PDU session resource information of the terminal device on the first access network device, and / Or, which QoS flows can be accepted or rejected, and / or which DRB data needs to be forwarded.
  • the second access network device may also determine a General Packet Radio Service Tunneling Protocol (GTP) channel address corresponding to the accepted PDU session, and / or a DRB corresponding to the DRB that needs data forwarding.
  • GTP General Packet Radio Service Tunneling Protocol
  • the GTP channel address includes the IP address and / or endpoint identification of the GTP channel.
  • the IP address may be a transport layer address (Transport Layer Address, TLA for short)
  • the endpoint identifier may be a GTP tunnel endpoint identifier (GTP-TEID).
  • the PDU service receiving information may include any one of the following: identification information of the first PDU session accepted by the second access network device, and identification information of the second PDU session rejected by the second access network device.
  • the first PDU session and the second PDU session are PDU sessions of the terminal device on the first access network device. There may be at least one first PDU session, and there may be zero and at least one second PDU session.
  • the PDU service receiving information may further include second information, and the second information includes a GTP channel address corresponding to the first PDU session.
  • the PDU service receiving information may further include at least one of the following information: identification information of the first QoS flow accepted by the second access network device, identification information of the first QoS flow accepted by the second access network device, and Corresponding data forwarding acceptance instruction information, where the data forwarding instruction information indicates acceptance of forwarding data of the first Qos flow, and identification information of the second QoS flow rejected by the second access network device.
  • the first QoS flow and the second QoS flow are QoS flows corresponding to the services of the terminal device on the first access network device.
  • there may be at least one first QoS flow there may be zero and at least one second QoS flow.
  • the first QoS flow is a QoS flow corresponding to the first PDU session. If a second QoS flow exists, the second QoS flow is also a QoS flow corresponding to the first PDU session.
  • the PDU service receiving information may further include: first information, the first information includes identification information of a first DRB that needs data forwarding; further, the first information further includes an uplink GTP channel address corresponding to the first DRB and / Or downlink GTP channel address; the first DRB is the DRB corresponding to the service of the terminal device in the first access network device.
  • an example is as follows.
  • the service of the terminal device on the first access network device corresponds to PDU session 1 and PDU session 2.
  • the PDU session 1 includes QoS flow 1 and QoS flow 2.
  • the received PDU service receiving information may include the identification information (for example, 1) of the received PDU session 1, the identification information (for example, 1) of the received QoS flow 1, and the data forwarding acceptance instruction information (for example, " Data Forwarding Acceptance "), the identification information of QoS flow 2 (for example, 2), the uplink and / or downlink GTP channel address corresponding to DRB1, and the identification information of the PDU session 2 including the rejection is 2 (for example, 2).
  • the cells included in the PDU service reception information are shown in Table 1:
  • the PDU service receiving information may further include a reason for rejecting the second PDU session.
  • the reason for rejecting the second PDU session may be that the target cell (the cell corresponding to the second access network device where the terminal device is located) has no resources, or the target cell does not support the second PDU session.
  • the PDU service receiving information may further indicate a reason for rejecting the second Qos flow.
  • the reason for rejecting the second Qos flow may be that the target cell has no resources, or the target cell does not support the second Qos flow.
  • the target cell does not support the second Qos flow, which means that the target cell cannot meet the conditions corresponding to the Qos flow parameters corresponding to the second Qos flow;
  • the Qos flow parameters may include at least one of the following: priority, packet delay planning, Packet error rate, delay-sensitive indication, average window, maximum burst of data packets.
  • the foregoing PDU service receiving information may be carried in a data forwarding address indication message, such as a DATA FORWARDING ADDRESS INDICATION message, or in another message, or may be an independent message.
  • a data forwarding address indication message such as a DATA FORWARDING ADDRESS INDICATION message
  • the sending a data packet by the first access network device to the second access network device includes: the first access network device sends the data packet to the second access network according to the received PDU service receiving information.
  • the device sends a data packet.
  • the first access network device after receiving the PDU service reception information, sends data corresponding to the PDU session and / or QoS flow accepted by the second access network device to the second access network device according to the PDU service reception information. package. Specifically, the first access network device sends a data packet corresponding to the PDU session accepted by the second access network device to the second access network device according to the GTP channel address of the PDU session in the PDU service receiving information; and / or, The first access network device sends the second access network device to the second access network device according to the GTP channel address of the PDU session in the PDU service reception information and / or the uplink GTP channel address and / or the downlink GTP channel address corresponding to the DRB. The data packet carried by the corresponding DRB corresponding to the QoS flow accepted by the network access device.
  • the first access network device sends transmission status indication information to the second access network device, and the transmission status indication information is used to indicate the transmission status of the data packet corresponding to the service of the terminal device on the first access device.
  • the transmission status indication information is used to indicate the transmission status of the uplink and / or downlink PDCP data packets carried by the terminal device in the DRB of the first access device.
  • the transmission status indication information is used to indicate the transmission status of the uplink and / or downlink PDCP data packets carried by the terminal device requiring data forwarding accepted by the second access network device in the first DRB of the first access network device.
  • the set composed of all the first data packets is a subset of the set composed of all the uplink data packets corresponding to the services of the terminal device at the first access device, all the second data packets, and all the third data packets.
  • the composed set is a subset of the set composed of all the downlink data packets corresponding to the services of the terminal device at the first access device; where the meaning of the first data packet, the second data packet, and the third data packet in this implementation is See the explanation in the embodiment shown in FIG. 3.
  • the foregoing transmission status indication information is a separate message, such as a sequence status forwarding (SNSTATUSTRANSFER) message.
  • the transmission status indication information is sent by the first access network device to the second access network device. At this time, the transmission status indication information may be sent after the first access network device receives the PDU service reception information.
  • the above-mentioned transmission status indication information may also be included in the first response message of step S402, that is, step S405 does not need to be performed at this time. At this time, the transmission status indication information is sent on the first access network Before the device receives the PDU service reception information.
  • the transmission status indication information may include: DRB identification information, length information of the count value of the data packet, and the second access network device allocates a count value for the next downlink data packet without an assigned count value, that is, the second connection The count value assigned by the network-connected device to the first and third data packets.
  • the transmission status indication information may further include a count value of the first uplink data packet that is lost by the first access network device.
  • the first uplink data packet lost by the first access network device is the first uplink data packet that was not successfully received by the first access network device.
  • the second access network device may learn, based on the count value of the first packet lost by the first access network device in the uplink data packet carried by the DRB, that the first access network device in the uplink data packet carried by the DRB is lost. Count of other packets.
  • the transmission status indication information may further include first indication information, which is used to indicate whether the uplink data packet sent by the terminal device is successfully received by the first access network device.
  • the first indication information may be a bit string.
  • the first bit is used to indicate whether the first data packet after the first uplink data packet lost by the first access network device in the uplink data packets carried by the DRB is successfully received by the first access network device. receive.
  • the second access network device may learn whether the uplink data packet is successfully received by the first access network device according to the first instruction information.
  • the transmission status indication information may be used to indicate that the terminal device that needs data forwarding accepted by the second access network device is The transmission status of the uplink and / or downlink data packets carried by the first DRB of the first access network device.
  • the "identification information of the DRB" is identification information of the first DRB.
  • the "length information of the count value of the data packet” is the length information of the count value of the uplink and / or downlink data packet carried by the first DRB; "the second access network device is the next downlink data without an assigned count value
  • the “count value for packet allocation” is the count value assigned by the second access network device for the next downlink data packet carried by the first DRB for the assigned count value; “the first uplink data packet lost by the first access network device
  • the “count value” is a count value of the first uplink data packet lost by the first access network device among the uplink data packets carried by the first DRB; the first indication information is used to indicate whether the uplink data packet carried by the first DRB is the first The access network device received it successfully.
  • the transmission status indication information may include uplink and / or downlink data packets carried by all DRBs of the terminal device on the first access network device.
  • the specific transmission status please refer to the above description and will not be repeated here.
  • the first access network device sends the transmission status indication information to the second access network device, so that the services of the terminal device on the first access network device can continue to be normally performed on the second access network device.
  • the first access device since the first access device sends a data packet to the second access network device according to the PDU service receiving information of the second access network device, the first access network device can be minimized to the second The access network device sends a data packet rejected by the second access network device to reduce signaling overhead.
  • FIG. 5 is a third signaling interaction diagram of a data transmission method according to an embodiment of the present application; as shown in FIG. 5, the method in this embodiment may include:
  • Step S501 The second access network device sends a first message to the first access network device, where the first message is used to request context information of the terminal device;
  • Step S502 The first access network device sends a first response message to the second access network device.
  • the first response message includes context information of the terminal device.
  • the context information includes the terminal device's Network equipment's PDU session resource information and transmission status indication information.
  • transmission status indication information refer to the description of step S405, which is not repeated here.
  • Step S503 The second access network device sends PDU service reception information to the first access network device.
  • Step S504 The first access network device sends a PDCP data packet to the second access network device.
  • steps S501, S503, and 504 in this embodiment refer to the description of steps S401, S403, and S404 in the embodiment shown in FIG. 4, respectively, and will not be described in this embodiment.
  • step S502 reference is made to the description of steps S402 and S405 in the embodiment shown in FIG. 4, which will not be described in this embodiment.
  • the first access device since the first access device sends a data packet to the second access network device according to the PDU service receiving information of the second access network device, the first access network device can be minimized to the first access network device.
  • the second access network device sends a data packet rejected by the second access network device to reduce signaling overhead.
  • FIG. 6 is a fourth signaling interaction diagram of a data transmission method according to an embodiment of the present application; as shown in FIG. 6, the method in this embodiment may include:
  • Step S601 The terminal device sends a re-establishment request to the second access network device.
  • the terminal device sends a re-establishment request to the second access network device.
  • Step S602 The second access network device sends a first message to the first access network device, where the first message is used to request context information of the terminal device;
  • the first message may be a RETRIEVE UE CONTEXT REQUEST message.
  • Step S603 The first access network device sends a first response message to the second access network device.
  • the first response message includes context information of the terminal device; the context information of the terminal device includes PDU session resource information of the terminal device on the first access network device;
  • the first response message may be a RETRIEVE UE CONTEXT RESPONSE message.
  • Step S604 The second access network device sends PDU service reception information to the first access network device.
  • the second access network device sends the PDU service receiving information of the second access network device to the first access network device according to the PDU session resource information of the terminal device in the first access network device;
  • the PDU service receiving information may be carried in a DATA FORWARDING ADDRESS INDICATION message, or may be an independent message.
  • Step S605 The first access network device sends a data packet to the second access network device.
  • the first access network device receives information according to the PDU service, and sends a data packet to the second access network device;
  • Step S606 The first access network device sends transmission status indication information to the second access network device, where the transmission status indication information is used to indicate the transmission status of the data packet corresponding to the service of the terminal device on the first access network device;
  • the transmission status indication information may be a serial number status forwarding (SNSTATUSTRANSFER) message.
  • the transmission status indication information may also be carried in the first response message, and there is no longer step S606 at this time.
  • Step S607 The second access network device sends a re-establishment message to the terminal device.
  • Step S608 The terminal device sends a re-establishment completion message to the second access network device.
  • the first access network device is the access network device corresponding to the terminal device before the re-establishment process
  • the second access network device is the one between the terminal device and the first access network device.
  • steps S602 to S606 in this embodiment reference is made to the description in the implementation shown in FIG. 4, which is not repeated in this embodiment.
  • the size of the sequence numbers of the above processes does not mean the order of execution (such as the process between the terminal device and the access network device, and the execution order of the process between the access network device is not limited), nor is it It means that the steps corresponding to the serial numbers of the above processes must be performed, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.
  • This embodiment implements data transmission between the first access network device and the second access network device during the re-establishment process of acquiring terminal device context information; and because the first access device is based on the second access network device
  • the PDU service receiving information sends data packets to the second access network device. Therefore, the first access network device can reduce the number of data packets that the second access network device rejects to the second access network device. Order overhead.
  • the following describes a method in which the second access network device does not support data transmission in the re-establishment process.
  • the resource of the second access network device is tight, or the second access network device does not have related capabilities.
  • FIG. 7 is a signaling interaction diagram V of a data transmission method according to an embodiment of the present application; as shown in FIG. 7, the method in this embodiment may include:
  • Step S701 The terminal device sends a re-establishment request message to the second access network device.
  • the terminal device sends a re-establishment request message to the second access network device.
  • Step S702 The second access network device sends the first reset instruction information to the terminal device; the first reset instruction information instructs to reset the uplink packet count value, and deletes the data packet in the first data packet set;
  • the first data packet set is a set of downlink data packets received by the terminal device from the first access network device, or the first data packet set is the downlink data packets received by the terminal device from the first access network device and the A set of uplink data packets allocated with a count value;
  • the first access network device is an access network device corresponding to the terminal device before the re-establishment process.
  • the first reset indication information may be carried in a re-establishment message sent by the second access network device to the terminal device.
  • the execution sequence of step S701 is in step S702. prior to.
  • the first reset indication information is carried in a system message broadcasted by the second access network device. Understandably, in this implementation manner, the execution sequence of step S702 is before step S701.
  • the first reset indication information is sent by the second access network device to the terminal device based on a request sent by the terminal device.
  • Step S703 The terminal device resets the uplink packet count value according to the first reset instruction information, and deletes the data packet in the first data packet set.
  • the first reset instruction information is also used to indicate to the terminal device that the second access network device does not support data forwarding of the first access network device.
  • the terminal device may receive the second reset instruction information, which indicates that the terminal device does not need to reset the uplink packet count value, and It is not necessary to delete the data packet in the first data packet set; it can also be said that the second reset instruction information is also used to indicate to the terminal device that the second access network device supports data forwarding by the first access network device.
  • Step S704 The second access network device sends second instruction information to the first access network device, and the second instruction information indicates that the first access network device does not send a data packet to the second access network device.
  • the second access network device also sends the second instruction information to the first access network device. After receiving the second instruction information, the first access network device does not send a data packet to the second access network device.
  • the terminal device resets the count value of the uplink data packet and deletes the data packet in the first data packet set, so that the terminal device is connecting with the second After the re-establishment of the network access device is completed, services are restarted with the second access network device according to the uplink data packet with the reset count value.
  • step S701 may be before step S702, and step S701 may be after step S702 )
  • step S701 may be before step S702
  • step S701 may be after step S702
  • the following describes another method for data transmission when the second access network device does not support the re-establishment process.
  • FIG. 8 is a signaling interaction diagram of a method provided in an embodiment of the present application. Referring to FIG. 8, the method in this embodiment may include:
  • Step S801 The terminal device determines whether the cell that initiates the re-establishment request and the terminal device that detects the connection failure are the same cell;
  • Step S802 If the terminal device is not the same cell, the terminal device resets the count value of the uplink data packet and deletes the data packet in the first data packet set.
  • the first data packet set is a set composed of the downlink data packets received by the terminal device.
  • the first data packet set is a set composed of a downlink data packet received by the terminal device and an uplink data packet to which a count value has been allocated.
  • the difference between this embodiment and the embodiment shown in FIG. 7 is that the terminal device defaults that the second access network device does not support data transmission in the re-establishment process.
  • the terminal device only needs to detect that the cells initiating the re-establishment process are different.
  • the count value of the uplink data packet is reset, and the data packet in the first data packet set is deleted.
  • the terminal device resets the count value of the uplink data packet and deletes the data packet in the first data packet set, so that the terminal device is connecting with the second After the re-establishment of the network access device is completed, services are restarted with the second access network device according to the uplink data packet with the reset count value.
  • the method implemented by the first access network device may also be implemented by a component (such as a chip or a circuit) applicable to the first access network device.
  • the method implemented by the second access network device may also be implemented by a component (such as a chip or a circuit) applicable to the second, access network device.
  • the method implemented by the terminal device may also be implemented by The components (such as chips or circuits) of the terminal device are implemented.
  • FIG. 9 is a first schematic structural diagram of a communication device according to an embodiment of the present application.
  • the communication apparatus 500 in this embodiment may be the first access network device (or a component that can be used for the first access network device) or the second access network mentioned in the foregoing method embodiment.
  • the communication device may be used to implement the method corresponding to the terminal device, the first access network device, or the second access network device described in the foregoing method embodiment. For details, refer to the description in the foregoing method embodiment.
  • the communication device 500 may include one or more processors 501.
  • the processor 501 may also be referred to as a processing unit and may implement certain control or processing functions.
  • the processor 501 may be a general-purpose processor or a special-purpose processor. For example, it may be a baseband processor or a central processing unit.
  • the baseband processor can be used to process the communication protocol and communication data
  • the central processing unit can be used to control the communication device, execute a software program, and process the data of the software program.
  • the processor 501 may also store instructions 503 or data (such as intermediate data).
  • the instruction 503 may be executed by the processor, so that the communication apparatus 500 executes the method corresponding to the terminal device, the first access network device, or the second access network device described in the foregoing method embodiment.
  • the communication device 500 may include a circuit that can implement the functions of sending, receiving, or communicating in the foregoing method embodiments.
  • the communication device 500 may include one or more memories 502 on which instructions 504 may be stored, and the instructions may be executed on the processor, so that the communication device 500 executes the foregoing method implementation. Method described in the example.
  • the memory may also store data.
  • the processor and the memory may be set separately or integrated together.
  • the communication device 500 may further include a transceiver 505 and / or an antenna 506.
  • the processor 501 may be referred to as a processing unit and controls a communication device (a terminal device or a network device).
  • the transceiver 505 may be referred to as a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and is configured to implement a transceiver function of a communication device.
  • the processor 501 and the transceiver 505 described in this application can be implemented in integrated circuits (ICs), analog ICs, radio frequency integrated circuits (RFICs), mixed-signal ICs, and application-specific integrated circuits (application-specific integrated circuits). circuit (ASIC), printed circuit board (PCB), electronic equipment, etc.
  • the processor and transceiver can also be manufactured using various 1C process technologies, such as complementary metal oxide semiconductor (CMOS), nMetal-oxide-semiconductor (NMOS), and P-type Metal oxide semiconductor (positive channel metal oxide semiconductor (PMOS), bipolar junction transistor (BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.
  • CMOS complementary metal oxide semiconductor
  • NMOS nMetal-oxide-semiconductor
  • PMOS bipolar junction transistor
  • BiCMOS bipolar CMOS
  • SiGe silicon germanium
  • GaAs gallium arsen
  • the communication device 500 is described by using a terminal device or a network device as an example, the scope of the communication device described in this application is not limited to the above terminal device or the above network device, and the structure of the communication device may be Not limited by Figure 5.
  • the communication device 500 may be a stand-alone device or may be part of a larger device.
  • the device may be:
  • the IC set may also include a storage component for storing data and / or instructions;
  • ASIC such as a modem (MSM)
  • FIG. 10 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • the terminal device may be applicable to the terminal device described in the foregoing embodiments of the present application.
  • FIG. 10 shows only the main components of the terminal device.
  • the terminal device 600 includes a processor, a memory, a control circuit, an antenna, and an input / output device.
  • the processor is mainly used for processing communication protocols and communication data, and controlling the entire terminal device, executing software programs, and processing data of the software programs.
  • the memory is mainly used for storing software programs and data.
  • the radio frequency circuit is mainly used for the conversion of baseband signals and radio frequency signals and the processing of radio frequency signals.
  • the antenna is mainly used to transmit and receive radio frequency signals in the form of electromagnetic waves.
  • Input / output devices such as a touch screen, a display screen, and a keyboard, are mainly used to receive data input by the user and output data to the user.
  • the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program.
  • the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit. After the radio frequency circuit processes the baseband signal, the radio frequency signal is sent out through the antenna as electromagnetic waves.
  • the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor.
  • the processor converts the baseband signal into data and processes the data.
  • FIG. 10 only shows one memory and a processor. In an actual terminal device, there may be multiple processors and memories.
  • the memory may also be referred to as a storage medium or a storage device, which is not limited in the embodiment of the present application.
  • the processor may include a baseband processor and a central processor.
  • the baseband processor is mainly used to process communication protocols and communication data
  • the central processor is mainly used to control and execute the entire terminal device.
  • the processor in FIG. 10 integrates the functions of the baseband processor and the central processing unit.
  • the baseband processor and the central processing unit may also be independent processors, which are interconnected through technologies such as a bus.
  • the terminal device may include multiple baseband processors to adapt to different network standards, the terminal device may include multiple central processors to enhance its processing capabilities, and various components of the terminal device may be connected through various buses.
  • the baseband processor may also be expressed as a baseband processing circuit or a baseband processing chip.
  • the central processing unit may also be expressed as a central processing circuit or a central processing chip.
  • the function of processing communication protocols and communication data may be built in the processor or stored in the storage unit in the form of a software program, and the processor executes the software program to implement the baseband processing function.
  • the data transmission device includes a receiving module 701 and a sending module 702;
  • the receiving module 701 is configured to obtain a first message from a second access network device, where the first message is used to request context information of a terminal device;
  • the sending module 702 is configured to send a data packet to the second access network device
  • the data transmission device is an access network device corresponding to the terminal device before the re-establishment process
  • the second access network device is an access network device corresponding to the terminal device initiating the re-establishment process.
  • the receiving module 701 is further configured to obtain protocol data unit PDU service receiving information from the second access network device, where the PDU service receiving information includes a first received by the second access network device. Identification information of a PDU session and / or identification information of a rejected second PDU session; the first PDU session and the second PDU session are PDU sessions of the terminal device at the data transmission device;
  • the sending module 702 is specifically configured to send the data packet according to the received information of the PDU service.
  • the PDU service receiving information further includes: identification information of a first quality of service QoS flow accepted by the second access network device and / or identification information of a second QoS flow rejected; the first QoS The flow and the second QoS flow are QoS flows corresponding to services of the terminal device on the data transmission device.
  • the PDU service receiving information further includes: first information and / or second information;
  • the first information includes identification information of a first data bearer DRB that needs data forwarding, and an uplink and / or downlink general packet radio service tunneling protocol GTP channel address corresponding to the first DRB, where the first DRB A DRB corresponding to the service of the terminal device on the first access network device; the second information includes a GTP channel address corresponding to the first PDU session.
  • the sending module 702 is further configured to send transmission status indication information to the second access network device, where the transmission status indication information is used to indicate a data packet for a service of the terminal device in the data transmission device Transmission status
  • the transmission status indication information includes:
  • the second access network device allocates a count value for a next downlink data packet without an assigned count value.
  • the transmission status indication information further includes at least one of the following:
  • First indication information used to indicate whether an uplink data packet sent by the terminal device is successfully received by the data transmission device.
  • the data transmission device in this embodiment may be used to execute the technical solution of the first access network device in the method embodiments shown in FIG. 3 to FIG. 6.
  • the implementation principles and technical effects are similar, and are not described herein again.
  • FIG. 12 is a second schematic structural diagram of a data transmission device according to an embodiment of the present application.
  • the data transmission device includes a receiving module 801.
  • the receiving module 801 is configured to obtain second instruction information from a second access network device, where the second instruction information indicates that the data transmission device does not send a data packet to the second access network device.
  • the data transmission device in this embodiment may be used to implement the technical solution of the first access network device in the embodiment shown in FIG. 7.
  • the implementation principles and technical effects are similar, and details are not described herein again.
  • FIG. 13 is a third structural schematic diagram of a data transmission device according to an embodiment of the present application.
  • the data transmission device includes a receiving module 901 and a sending module 902;
  • the sending module 902 is configured to send a first message to a first access network device, where the first message is used to request context information of a terminal device;
  • the receiving module 901 is configured to receive a data packet from the first access network device
  • the first access network device is an access network device corresponding to the terminal device before the re-establishment process
  • the data transmission device is an access network device corresponding to the terminal device initiating a re-establishment process.
  • the sending module 902 is further configured to send protocol data unit PDU service reception information to the first access network device, where the PDU service reception information includes a first PDU session resource accepted by the data transmission device. Identification information of the second PDU session resource and / or identification information of the rejected second PDU session resource; the first PDU session and the second PDU session are PDU sessions of the terminal device in the first access network device.
  • the PDU service receiving information further includes: identification information of a first quality of service Qos flow accepted by the data transmission device and / or identification information of a second Qos flow rejected; the first Qos flow and The second Qos flow is a Qos flow corresponding to a service of the terminal device on the first access network device.
  • the PDU service receiving information further includes: first information and / or second information;
  • the first information includes identification information of a first data bearer DRB that needs data forwarding, and an uplink and / or downlink general packet radio service tunneling protocol GTP channel address corresponding to the first DRB, where the first DRB A DRB corresponding to the service of the terminal device on the first access network device; the second information includes a GTP channel address corresponding to the first PDU session.
  • the receiving module 901 is further configured to obtain transmission status indication information from the first access network device, where the transmission status indication information is used to instruct a terminal device to perform services on the first access network device.
  • Data packet transmission status is used to instruct a terminal device to perform services on the first access network device.
  • the transmission status indication information includes:
  • the data transmission device assigns a count value to a next downlink data packet without an assigned count value.
  • the transmission status indication information further includes at least one of the following:
  • First indication information used to indicate whether an uplink data packet sent by the terminal device is successfully received by the first access network device.
  • the data transmission device in this embodiment may be used to execute the technical solution of the second access network device in the method embodiments shown in FIG. 3 to FIG. 6.
  • the implementation principles and technical effects are similar, and are not described herein again.
  • FIG. 14 is a fourth structural schematic diagram of a data transmission device according to an embodiment of the present application.
  • the data transmission device includes a receiving module 1001 and a sending module 1002;
  • a receiving module 1001 configured to obtain a re-establishment request message from a terminal device
  • the sending module 1002 is configured to send first reset instruction information to the terminal device, where the first reset instruction information indicates resetting an uplink packet count value, and deleting a data packet in the first data packet set, where the first data
  • the packet set is a set of downlink data packets received by the terminal device from the first access network device, or the first data packet set is a downlink data packet received by the terminal device from the first access network device and has been allocated.
  • the sending module 1002 is further configured to send second instruction information to the first access network device, where the second instruction information indicates that the first access network device does not send a data packet to the data transmission device.
  • the data transmission device in this embodiment may be used to execute the technical solution of the second access network device in the method embodiment shown in FIG. 7.
  • the implementation principles and technical effects are similar, and details are not described herein again.
  • FIG. 15 is a second schematic structural diagram of a communication device according to an embodiment of the present application.
  • the communication device includes a sending module 1101, a receiving module 1102, and a resetting module 1103.
  • the sending module 1101 is configured to send a re-establishment request message to a second access network device; the second access network device initiates an access network device corresponding to the terminal device to initiate a re-establishment process;
  • the receiving module 1102 is configured to obtain first reset indication information from the second access network device, where the first reset indication information instructs to reset an uplink packet count value, and deletes the first packet set.
  • a data packet where the first data packet set is a set of downlink data packets received by the terminal device from the first access network device, or the first data packet set is the terminal device from the first access network
  • the device receives a set consisting of a downlink data packet and an uplink data packet to which a count value has been assigned; the first access network device is an access network device corresponding to the terminal device before the re-establishment process.
  • the resetting module 1103 is configured to reset an uplink data packet count value and delete a data packet in a first data packet set according to the first reset instruction information.
  • the communication device in this embodiment may be used to execute the technical solution executed by the terminal device in the method embodiment shown in FIG. 7.
  • the implementation principles and technical effects are similar, and details are not described herein again.
  • the communication device in this embodiment may be a terminal device or a component that can be used for the terminal device, which is not limited in this embodiment of the present application.
  • FIG. 16 is a third schematic structural diagram of a communication device according to an embodiment of the present application.
  • the terminal device includes a determining module 1201 and a reset module 1202.
  • a determining module 1201, configured to determine whether a cell that initiates a re-establishment request and a terminal device detect that the connection failure cell is the same cell;
  • a resetting module 1202 is configured to reset a count value of an uplink data packet and delete a data packet in a first data packet set if a cell that initiates a re-establishment request and a terminal device detect that the connection failure is not the same cell; and
  • the first data packet set is a set composed of downlink data packets received by the terminal device, or the first data packet set is a set composed of downlink data packets received by the terminal device and uplink data packets to which a count value has been allocated.
  • the communication device in this embodiment may be used to execute the technical solution executed by the terminal device in the method embodiment shown in FIG. 8.
  • the implementation principles and technical effects are similar, and details are not described herein again.
  • the communication device in this embodiment may be a terminal device or a component that can be used for the terminal device, which is not limited in this embodiment of the present application.
  • the division of the modules in the embodiments of the present application is schematic, and is only a logical function division. In actual implementation, there may be another division manner.
  • the functional modules in the embodiments of the present application may be integrated into one processing module, or each module may exist separately physically, or two or more modules may be integrated into one module.
  • the above integrated modules may be implemented in the form of hardware or software functional modules.
  • the integrated module When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially a part that contributes to the existing technology or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium.
  • a computer device which may be a personal computer, a server, or a network device
  • the aforementioned storage media include: U disks, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks or compact discs, and other media that can store program codes .
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server, or data center Transmission by wire (for example, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (for example, infrared, wireless, microwave, etc.) to another website site, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, or the like that includes one or more available medium integrations.
  • the available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (Solid State Disk (SSD)), and the like.
  • a magnetic medium for example, a floppy disk, a hard disk, a magnetic tape
  • an optical medium for example, a DVD
  • a semiconductor medium for example, a solid state disk (Solid State Disk (SSD)

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Abstract

本申请实施例提供一种数据传输的方法和设备，该方法应用于重建立过程，包括：第一接入网设备从第二接入网设备获取第一消息，所述第一消息用于请求终端设备的上下文信息；所述第一接入网设备向所述第二接入网设备发送数据包；其中，所述第一接入网设备为所述终端设备在重建立过程之前对应的接入网设备，所述第二接入网设备为所述终端设备发起重建立过程对应的接入网设备。本申请实施例通过第一接入网设备获取到用于请求终端设备的上下文信息的消息后，向第二接入网设备发送数据包，实现了重建立过程中第一接入网设备和第二接入网设备之间的数据传输。

Description

数据传输的方法和设备
本申请要求于2018年8月10日提交中国专利局、申请号为2018109102418、申请名称为“数据传输的方法和设备”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
本申请涉及通信技术领域，尤其涉及一种数据传输的方法和设备。
背景技术
当连接态的终端设备在和源小区或源基站保持连接时，发生了连接失败，需要终端设备在新小区或源小区向目标基站发起无线资源控制(Radio Resource Control，简称：RRC)重建立请求，完成目标基站与终端设备之间的RRC连接的重建立过程。连接失败的原因可为：无线链路失败(radio link failure，简称RLF)，切换失败(handover failure，HOF)，完整性保护检查失败，重配置失败等。
若终端设备与源基站之间连接失败，则需要重新建立终端设备与目标基站之间的RRC连接。
终端设备与目标基站重建立过程中源基站与目标基站之间如何进行数据传输，是亟待解决的问题。
发明内容
本申请实施例提供一种数据传输的方法和设备，实现了终端设备与目标基站重建立过程中源基站与目标基站之间的数据传输。
第一方面，本申请实施例提供一种数据传输方法，包括：
第一接入网设备从第二接入网设备获取第一消息，所述第一消息用于请求终端设备的上下文信息；
所述第一接入网设备向所述第二接入网设备发送数据包；
其中，所述第一接入网设备为所述终端设备在重建立过程之前对应的接入网设备，所述第二接入网设备为所述终端设备发起重建立过程对应的接入网设备。
该方案中，第一接入网设备在接收到第二接网设备发送的用于请求终端设备的上下文信息的第一消息后，获知该终端设备正在请求与该第二接入网设备建立连接，即获知终端设备正在进行重建立过程连接，因此，第一接入网设备向第二接入网设备发送数据包，实现了重建立过程中的第一接入网设备以及第二接入网设备之间的数据传输。
在一种可能的设计中，还包括：
所述第一接入网设备从所述第二接入网设备获取所述第二接入网设备的协议数据 单元PDU业务接收信息，所述PDU业务接收信息包括所述第二接入网设备接受的第一PDU会话的标识信息和/或拒绝的第二PDU会话的标识信息；所述第一PDU会话和所述第二PDU会话为所述终端设备在所述第一接入网设备的PDU会话；
所述第一接入网设备向所述第二接入网设备发送数据包，包括：
所述第一接入网设备根据所PDU业务接收信息发送所述数据包。
该设计中，第二接入网设备向第一接入网设备发送第二接入网设备接受的第一PDU会话的标识信息和/或拒绝的第二PDU会话的标识信息，使得第一接入网设备向第二接入网设备发送第一PDU会话对应的数据包，不发送第二PDU会话对应的数据包，因此，在第二PDU会话存在的情况下，可以减少第一接入网设备向第二接入网设备发送的数据包，因此减少了信令的开销。
在一种可能的设计中，所述PDU业务接收信息还包括：所述第二接入网设备接受的第一服务质量QoS流的标识信息和/或拒绝的第二QoS流的标识信息；所述第一QoS流和所述第二QoS流为所述终端设备在所述第一接入网设备的业务对应的QoS流。
该设计中，第二接入网设备向第一接入网设备发送第二接入网设备接受的第一QoS流的标识信息和/或拒绝的第二QoS流的标识信息，使得第一接入网设备向第二接入网设备发送与第一QoS流关联的数据包，因此，在第二QoS流存在的情况下，可以减少第一接入网设备向第二接入网设备发送的数据包，因此减少了信令的开销。
在一种可能的设计中，所述PDU业务接收信息还包括：第一信息和/或第二信息；
所述第一信息包括需要数据转发的第一数据承载DRB的标识信息，以及所述第一DRB对应的上行和/或下行通用分组无线服务隧穿协议GTP通道地址，其中，所述第一DRB为所述终端设备在所述第一接入网设备的业务对应的DRB；所述第二信息包括所述第一PDU会话对应的GTP通道地址。
该设计可以使得第一接入网设备根据第一PDU会话对应的GTP通道地址向第二接入网设备发送第一PDU会话对应的数据包，使得第一接入网设备根据第一PDU会话的GTP通道地址，和/或，DRB对应的上行GTP通道地址和/或下行GTP通道地址，向第二接入网设备发送第二接入网设备接受的QoS流对应的相应DRB承载的数据包。
在一种可能的设计中，还包括：所述第一接入网设备向所述第二接入网设备发送传输状态指示信息，所述传输状态指示信息用于指示所述终端设备在所述第一接入网设备的业务的数据包的传输状态；
所述传输状态指示信息包括：
DRB的标识信息，数据包的计数值的长度信息，以及
所述第二接入网设备为下一个未分配计数值的下行数据包分配的计数值；
该设计可以使得第二接入网设备获知如何为终端设备在第一接入网设备上的业务对应的下行数据包分配计数值。
在一种可能的设计中，所述传输状态指示信息还包括如下至少一项：
所述第一接入网设备丢失的第一个上行数据包的计数值；因此，第二接入网设备可根据丢失的第一个上行数据包的计数值，获知丢失的其它上行数据包的计数值
用于指示所述终端设备发送的上行数据包是否被所述第一接入网设备成功接收的第一指示信息；因此，第二接入网设备可获知哪些上行数据包没有被第一接入网设备 成功接收。
综上，第一接入网设备向第二接入网设备发送传输状态指示信息，使得第二接入网设备可以获知终端设备在第一接入设备的DRB承载的上行和/或下行PDCP数据包的传输状态，或者获知第二接入网设备接受的需要数据转发的终端设备在第一接入网设备的上述第一DRB承载的上行和/或下行PDCP数据包的传输状态，从而使得终端设备在第一接入网设备的业务可以在第二接入网设备上继续正常的进行。
第二方面，本申请实施例提供一种数据传输的方法，包括：
第二接入网设备向第一接入网设备发送第一消息，所述第一消息用于请求终端设备的上下文信息；
所述第二接入网设备从所述第一接入网设备接收数据包；
其中，所述第一接入网设备为所述终端设备在重建立过程之前对应的接入网设备，所述第二接入网设备为所述终端设备发起重建立过程对应的接入网设备。
该方案中，第二接网设备向第一接入网设备发送用于请求终端设备的上下文信息的第一消息后，使得第一接入网设备获知该终端设备正在请求与该第二接入网设备建立连接，即获知终端设备正在进行重建立过程连接，因此，第一接入网设备可以向第二接入网设备发送数据包，实现了重建立过程中的第一接入网设备以及第二接入网设备之间的数据传输。
在一种可能的设计中，还包括：
所述第二接入网设备向所述第一接入网设备发送协议数据单元PDU业务接收信息，所述PDU业务接收信息包括所述第二接入网设备接受的第一PDU会话资源的标识信息和/或拒绝的第二PDU会话资源的标识信息；所述第一PDU会话和所述第二PDU会话为所述终端设备在所述第一接入网设备的PDU会话。
该设计中，第二接入网设备向第一接入网设备发送第二接入网设备接受的第一PDU会话的标识信息和/或拒绝的第二PDU会话的标识信息，使得第一接入网设备向第二接入网设备发送第一PDU会话对应的数据包，不发送第二PDU会话对应的数据包，因此，在第二PDU会话存在的情况下，可以减少第一接入网设备向第二接入网设备发送的数据包，因此减少了信令的开销。
在一种可能的设计中，所述PDU业务接收信息中还包括：所述第二接入网设备接受的第一服务质量Qos流的标识信息和/或拒绝的第二Qos流的标识信息；所述第一Qos流和所述第二Qos流为所述终端设备在所述第一接入网设备的业务对应的Qos流。
该设计中，第二接入网设备向第一接入网设备发送第二接入网设备接受的第一QoS流的标识信息和/或拒绝的第二QoS流的标识信息，使得第一接入网设备向第二接入网设备发送与第一QoS流关联的数据包，因此，在第二QoS流存在的情况下，可以减少第一接入网设备向第二接入网设备发送的数据包，因此减少了信令的开销。
在一种可能的设计中，所述PDU业务接收信息还包括：第一信息和/或第二信息；
所述第一信息包括需要数据转发的第一数据承载DRB的标识信息，以及所述第一DRB对应的上行和/或下行通用分组无线服务隧穿协议GTP通道地址，其中，所述第一DRB为所述终端设备在所述第一接入网设备的业务对应的DRB；所述第二信息包 括所述第一PDU会话对应的GTP通道地址。
该设计可以使得第一接入网设备根据第一PDU会话对应的GTP通道地址向第二接入网设备发送第一PDU会话对应的数据包，使得第一接入网设备根据第一PDU会话的GTP通道地址，和/或，DRB对应的上行GTP通道地址和/或下行GTP通道地址，向第二接入网设备发送第二接入网设备接受的QoS流对应的相应DRB承载的数据包。
在一种可能的设计中，还包括：
所述第二接入网设备从所述第一接入网设备获取传输状态指示信息，所述传输状态指示信息用于指示所述终端设备在所述第一接入网设备的业务的数据包的传输状态；
所述传输状态指示信息包括：
DRB的标识信息；
数据包的计数值的长度信息，以及
所述第二接入网设备为下一个未分配计数值的下行数据包分配的计数值。
该设计可以使得第二接入网设备获知如何为终端设备在第一接入网设备上的业务对应的下行数据包分配计数值。
在一种可能的设计中，所述传输状态指示信息还包括如下中的至少一项：
所述第一接入网设备丢失的第一个上行数据包的计数值；因此，第二接入网设备可根据丢失的第一个上行数据包的计数值，获知丢失的其它上行数据包的计数值
用于指示所述终端设备发送的上行数据包是否被所述第一接入网设备成功接收的第一指示信息；因此，第二接入网设备可获知哪些上行数据包没有被成功接收。
综上，第一接入网设备向第二接入网设备发送传输状态指示信息，使得第二接入网设备可以获知终端设备在第一接入设备的DRB承载的上行和/或下行PDCP数据包的传输状态，或者获知第二接入网设备接受的需要数据转发的终端设备在第一接入网设备的上述第一DRB承载的上行和/或下行PDCP数据包的传输状态，从而使得终端设备在第一接入网设备的业务可以在第二接入网设备上继续正常的进行。
第三方面，本申请实施例提供一种数据传输的方法，包括：
终端设备发送重建立请求消息至第二接入网设备；所述第二接入网设备为所述终端设备发起重建立过程对应的接入网设备；
所述终端设备从所述第二接入网设备获取第一重置指示信息，该第一重置指示信息指示重置上行的数据包计数值，以及删除第一数据包集中的数据包；其中，第一数据包集为终端设备从第一接入网设备接收到的下行数据包组成的集合，或者，第一数据包集为终端设备从第一接入网设备接收到的下行数据包和已经分配计数值的上行数据包组成的集合；所述第一接入网设备为所述终端设备在重建立过程之前对应的接入网设备。
所述终端设备根据所述第一重置指示信息，重置上行的数据包计数值，以及删除第一数据包集中的数据包。
本方案中，在第二接入网设备不支持数据传输的场景下，终端设备重置上行数据包的计数值，以及删除第一数据包集中的数据包，这样终端设备在与第二接入网设备重建立完成后，根据重置计数值的上行数据包与第二接入网设备重新进行业务。
第四方面，本申请实施例提供一种数据传输的方法，包括：
第二接入网设备从终端设备获取重建立请求消息；
第二接入网设备发送第一重置指示信息至终端设备，该第一重置指示信息指示重置上行的数据包计数值，以及删除第一数据包集中的数据包；其中，第一数据包集为终端设备从第一接入网设备接收到的下行数据包组成的集合，或者，第一数据包集为终端设备从所述第一接入网设备接收到的下行数据包和已经分配计数值的上行数据包组成的集合
第二接入网设备发送第二指示信息至所述第一接入网设备，所述第二指示信息指示所述第一接入网设备不发送数据包至第二接入网设备。
本方案中，在第二接入网设备不支持数据传输的场景下，终端设备根据第一重置指示信息重置上行数据包的计数值，以及删除第一数据包集中的数据包，这样终端设备在与第二接入网设备重建立完成后，根据重置计数值的上行数据包与第二接入网设备重新进行业务。
第五方面，本申请实施例提供一种数据传输的方法，包括：
第一接入网设备从第二接入网设备获取第二指示信息，所述第二指示信息指示所述第一接入网设备不发送数据包至所述第二接入网设备。
第六方面，本申请实施例提供一种数据传输的方法，包括：
终端设备确定发起重建立请求的小区和终端设备检测到连接失败的小区是否为同一小区；
若不为同一小区，则所述终端设备重置上行数据包的计数值，以及删除第一数据包集中的数据包；其中，第一数据包集为终端设备接收到的下行数据包组成的集合，或者，第一数据包集为终端设备接收到的下行数据包和已经分配计数值的上行数据包组成的集合。
本方案中，终端设备确定发起重建立请求的小区和终端设备检测到连接失败的小区不为同一小区时，终端设备就重置上行数据包的计数值，以及删除第一数据包集中的数据包，即此时，终端默认第二接入网设备不支持数据传输；这样终端设备在与第二接入网设备重建立完成后，根据重置计数值的上行数据包与第二接入网设备重新进行业务。
第七方面，本申请实施例提供一种数据传输设备，包括接收模块和发送模块；
所述接收模块，用于从第二接入网设备获取第一消息，所述第一消息用于请求终端设备的上下文信息；
所述发送模块，用于向所述第二接入网设备发送数据包；
其中，所述数据传输设备为所述终端设备在重建立过程之前对应的接入网设备，所述第二接入网设备为所述终端设备发起重建立过程对应的接入网设备。
在一种可能的设计中，所述接收模块，还用于从所述第二接入网设备获取协议数 据单元PDU业务接收信息，所述PDU业务接收信息包括所述第二接入网设备接受的第一PDU会话的标识信息和/或拒绝的第二PDU会话的标识信息；所述第一PDU会话和所述第二PDU会话为所述终端设备在所述数据传输设备的PDU会话；
所述发送模块，具体用于：根据所PDU业务接收信息发送所述数据包。
在一种可能的设计中，所述PDU业务接收信息还包括：所述第二接入网设备接受的第一服务质量QoS流的标识信息和/或拒绝的第二QoS流的标识信息；所述第一QoS流和所述第二QoS流为所述终端设备在所述数据传输设备的业务对应的QoS流。
在一种可能的设计中，所述PDU业务接收信息还包括：第一信息和/或第二信息；
所述第一信息包括需要数据转发的第一数据承载DRB的标识信息，以及所述第一DRB对应的上行和/或下行通用分组无线服务隧穿协议GTP通道地址，其中，所述第一DRB为所述终端设备在所述第一接入网设备的业务对应的DRB；所述第二信息包括所述第一PDU会话对应的GTP通道地址。
在一种可能的设计中，所述发送模块，还用于向所述第二接入网设备发送传输状态指示信息，所述传输状态指示信息用于指示终端设备在所述数据传输设备的业务的数据包的传输状态；
所述传输状态指示信息包括：
DRB的标识信息；
数据包的计数值的长度信息，以及
所述第二接入网设备为下一个未分配计数值的下行数据包分配的计数值。
在一种可能的设计中，所述传输状态指示信息还包括如下中的至少一项：
所述数据传输设备丢失的第一个上行数据包的计数值；
用于指示所述终端设备发送的上行数据包是否被所述数据传输设备成功接收的第一指示信息。
第八方面，本申请实施例提供一种数据传输设备，包括：接收模块和发送模块；
发送模块，用于向第一接入网设备发送第一消息，所述第一消息用于请求终端设备的上下文信息；
接收模块，用于从所述第一接入网设备接收数据包；
其中，所述第一接入网设备为所述终端设备在重建立过程之前对应的接入网设备，所述数据传输设备为所述终端设备发起重建立过程对应的接入网设备。
在一种可能的设计中，所述发送模块，还用于向所述第一接入网设备发送协议数据单元PDU业务接收信息，所述PDU业务接收信息包括所述数据传输设备接受的第一PDU会话资源的标识信息和/或拒绝的第二PDU会话资源的标识信息；所述第一PDU会话和所述第二PDU会话为所述终端设备在所述第一接入网设备的PDU会话。
在一种可能的设计中，所述PDU业务接收信息中还包括：所述数据传输设备接受的第一服务质量Qos流的标识信息和/或拒绝的第二Qos流的标识信息；所述第一Qos流和所述第二Qos流为所述终端设备在所述第一接入网设备的业务对应的Qos流。
在一种可能的设计中，所述PDU业务接收信息还包括：第一信息和/或第二信息；所述第一信息包括需要数据转发的第一数据承载DRB的标识信息，以及所述第一 DRB对应的上行和/或下行通用分组无线服务隧穿协议GTP通道地址，其中，所述第一DRB为所述终端设备在所述第一接入网设备的业务对应的DRB；所述第二信息包括所述第一PDU会话对应的GTP通道地址。
在一种可能的设计中，所述接收模块，还用于从所述第一接入网设备获取传输状态指示信息，所述传输状态指示信息用于指示终端设备在所述第一接入网设备的业务的数据包的传输状态；
所述传输状态指示信息包括：
DRB的标识信息；
数据包的计数值的长度信息，以及
所述数据传输设备为下一个未分配计数值的下行数据包分配的计数值。
在一种可能的设计中，所述传输状态指示信息还包括如下中的至少一项：
所述第一接入网设备丢失的第一个上行数据包的计数值；
用于指示所述终端设备发送的上行数据包是否被所述第一接入网设备成功接收的第一指示信息。
第九方面，本申请实施例提供一种通信装置，包括：
包括用于实现第一方面的通信方法的模块，部件或者电路；或者，
包括用于实现第二方面的通信方法的模块，部件或者电路；或者，
用于实现第三方面的通信方法的模块，部件或者电路；或者，
用于实现第四方面的通信方法的模块，部件或者电路；
用于实现第五方面的通信方法的模块，部件或者电路；
用于实现第六方面的通信方法的模块，部件或者电路。
第十方面，本申请实施例提供一种通信装置，用于实现第一方面或第二方面或第三方面或第四方面或第五方面或第六方面中任一所述的方法。
第十一方面，本申请实施例提供一种通信装置，用于实现第一方面或第二方面或第三方面或第四方面或第五方面或第六方面中任一所述的方法。
第十二方面，本申请实施例提供一种可读存储介质，所述可读存储介质上存储有计算机程序；所述计算机程序被执行时，实现第一方面或第二方面或第三方面或第四方面或第五方面或第六方面中任一所述的方法。
第十三方面，本申请实施例提供一种程序产品，所述程序产品包括计算机程序，所述计算机程序存储在可读存储介质中，通信装置的至少一个处理器可以从所述可读存储介质读取所述计算机程序，所述至少一个处理器执行所述计算机程序使得通信装置实施第一方面或第二方面或第三方面或第四方面或第五方面或第六方面任一所述的方法。
附图说明
图1为本申请实施例提供的通信系统的示意图；
图2为本申请一实施例提供的网络设备的协议栈示意图；
图3为本申请实施例提供的数据传输的方法的信令交互图一；
图4为本申请实施例提供的数据传输的方法的信令交互图二；
图5为本申请实施例提供的数据传输的方法的信令交互图三；
图6为本申请实施例提供的数据传输的方法的信令交互图四；
图7为本申请实施例提供的数据传输的方法的信令交互图五；
图8为本申请实施例提供的数据传输的方法的信令交互图六；
图9为本申请一实施例提供的一种通信装置的结构示意图一；
图10为本申请实施例提供的一种终端设备的结构示意图；
图11为本申请实施例提供的数据传输设备的结构示意图一；
图12为本申请实施例提供的数据传输设备的结构示意图二；
图13为本申请实施例提供的数据传输设备的结构示意图三；
图14为本申请实施例提供的数据传输设备的结构示意图四；
图15为本申请一实施例提供的一种通信装置的结构示意图二；
图16为本申请一实施例提供的一种通信装置的结构示意图三。
具体实施方式
图1为本申请实施例提供的通信系统的示意图，如图1所示，通信系统包括第一接入网(Radio Access Network，RAN)设备、第二接入网设备和终端设备。
以下，对本申请中的部分用语进行解释说明，以便于本领域技术人员理解：
接入网设备，是一种将终端设备接入到无线网络的设备，可以是长期演进(Long Term Evolution，LTE)中的演进型基站(Evolutional Node B，eNB或eNodeB)，或者中继站或接入点，或者5G网络中的基站，如发送和接收点(Transmission and Reception Point，TRP)、控制器，在此并不限定。一种可能的方式中，接入网设备可以是CU和DU分离架构的基站(如gNB)，如图2所示，图2为本申请一实施例提供的网络设备的协议栈示意图。RAN设备可以与核心网设备相连(例如可以是LTE的核心网，也可以是5G的核心网等)。CU和DU可以理解为是对基站从逻辑功能角度的划分。CU和DU在物理上可以是分离的也可以部署在一起。多个DU可以共用一个CU。一个DU也可以连接多个CU(图中未示出)。CU和DU之间可以通过接口相连，例如可以是F1接口。CU和DU可以根据无线网络的协议层划分。例如无线资源控制(Radio Resource Control，RRC)、业务数据适配协议栈(Service Data Adaptation Protocol，SDAP)以及分组数据汇聚层协议(packet data convergence protocol，PDCP)层的功能设置在CU，而无线链路控制(radio link control，RLC)，媒体接入控制(Media Access Control，MAC)层，物理(physical，PHY)层等的功能设置在DU。可以理解对CU和DU处理功能按照这种协议层的划分仅仅是一种举例，也可以按照其他的方式进行划分。例如可以将CU或者DU划分为具有更多协议层的功能。例如，CU或DU还可以划分为具有协议层的部分处理功能。在一种设计中，将RLC层的部分功能和RLC层以上的协议层的功能设置在CU，将RLC层的剩余功能和RLC层以下的协议层的功能设置在DU。在另一种设计中，还可以按照业务类型或者其他系统需求对CU或者DU的功能进行划分。例如按时延划分，将处理时间需要满足时延要求的功能设置在DU，不需要满足该时延要求的功能设置在CU。在另一种设计中，CU也可以 具有核心网的一个或多个功能。一个或者多个CU可以集中设置，也分离设置。例如CU可以设置在网络侧方便集中管理。DU可以具有多个射频功能，也可以将射频功能拉远设置。
CU的功能可以由一个实体来实现也可以由不同的实体实现。例如，可以对CU的功能进行进一步切分，例如，将控制面(CP)和用户面(UP)分离，即CU的控制面(CU-CP)和CU用户面(CU-UP)。例如，CU-CP和CU-UP可以由不同的功能实体来实现，所述CU-CP和CU-UP可以与DU相耦合，共同完成基站的功能。一种可能的方式中，CU-CP负责控制面功能，主要包含RRC和PDCP-C。PDCP-C主要负责控制面数据的加解密，完整性保护，数据传输等。CU-UP负责用户面功能，主要包含SDAP和PDCP-U。其中SDAP主要负责将核心网的数据进行处理并将数据流(flow)映射到承载。PDCP-U主要负责数据面的加解密，完整性保护，头压缩，序列号维护，数据传输等。其中CU-CP和CU-UP通过E1接口连接。CU-CP代表gNB通过Ng接口和核心网连接。通过F1-C(控制面)和DU连接。CU-UP通过F1-U(用户面)和DU连接。当然还有一种可能的实现是PDCP-C也在CU-UP。
终端设备：可以是无线终端设备也可以是有线终端设备，无线终端设备可以是指一种具有无线收发功能的设备，可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。所述终端设备可以是手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(Virtual Reality，VR)终端设备、增强现实(Augmented Reality，AR)终端设备、工业控制(industrial control)中的无线终端设备、无人驾驶(self driving)中的无线终端设备、远程医疗(remote medical)中的无线终端设备、智能电网(smart grid)中的无线终端设备、运输安全(transportation safety)中的无线终端设备、智慧城市(smart city)中的无线终端设备、智慧家庭(smart home)中的无线终端设备等等，在此不作限定。可以理解的是，本申请实施例中，终端设备也可以称为用户设备(user equipment，UE)。
在本专利申请中可能出现的对各种消息/信息/设备/网元/系统/装置/动作/操作/流程/概念等各类客体进行了赋名，但这些具体的名称并不构成对相关客体的限定，所赋名称可随着场景，语境或者使用习惯等因素而变更，对相关客体的技术含义的理解，应主要从其在技术方案中所体现/执行的功能和技术效果来确定。
由于RLF，HOF，完整性保护检查失败，重配置失败等其它原因，终端设备与源接入网设备的连接会发生失败，为了使得终端设备在源接入网设备的业务可以继续进行，终端设备会和目标接入网设备重新建立连接，重新建立连接的过程也可称为重建立过程或者重恢复过程或者重激活过程，本申请实施例对重建立连接的过程的名称并不作限制。此处的终端设备与接入网设备的连接可以为终端设备与接入网设备的RRC连接。当目标接入网设备没有存储终端设备的上下文信息时，目标接入网设备需要和源接入网设备进行信令交互以获取终端设备的上下文信息。下面采用具体的实施例对终端设备和目标接入网设备重新建立连接的过程时，目标接入网设备向源接入网设备请求获取终端设备上下文信息后目标接入网设备和源接入网设备间的数据传输的方法进行详细的说明。
图3为本申请实施例提供的数据传输的方法的信令交互图一；如图3所示，本实施例的方法可以包括：
步骤S301、第二接入网设备向第一接入网设备发送第一消息，第一消息用于请求终端设备的上下文信息；
步骤S302、第一接入网设备向第二接入网设备发送数据包。
具体地，本实施例中，第一接入网设备为终端设备在重建立过程之前对应的接入网设备，也就是第一接入网设备为终端设备发生连接失败的接入网设备；第二接入网设备为该终端设备与该第一接入网设备之间的连接断开后，发起重建立过程对应的接入网设备，也就是该终端设备请求建立连接的接入网设备。
对于步骤S301、在该终端设备与该第一接入网设备的连接失败后，该终端设备向该第二接入网设备发送重建立请求。该第二接入网设备接收到终端设备发送的重建立请求后，会向该第一接入设备发送第一消息，该第一消息用于请求终端设备的上下文信息。
可以理解地，该第一消息还可以用于第一接入网设备确定终端设备在第二接入网设备发起了重建立请求。
对于步骤S302、该第一接入网设备接收到该第二接入网设备发送的该第一消息后，可以获知该终端设备正在请求与该第二接入网设备建立连接，即获知终端设备正在进行重建立过程。为了保证终端设备在第一接入网设备的业务可以在终端设备和第二接入网设备间继续进行，因此该第一接入网设备需要将终端设备在第一接入网的数据包发送至该第二接入网设备。可以理解的是，该第一接入网设备将数据包发送至该第二接入网设备可以发生在该终端设备与该第二接入网设备重建立完成之前，也可以发生在该终端设备与该第二接入网设备重建立完成之后，本实施例中不作限制。
其中，本实施例中第一接入网设备向第二接入网设备发送的数据包可以为分组数据汇聚协议(Packet Data Convergence Protocol，简称PDCP)数据包；PDCP数据包可以为PDCP协议数据单元(Protocol Data Unit，简称PDU)，和/或，PDCP服务数据单元(Service Data Unit，简称SDU)。本申请实施例中都以PDCP数据包为例进行描述，本申请实施例对此不作限定。
可以理解地，该第一接入网设备发送至第二接入网设备的数据包为第一接入设备上保存的终端设备的至少部分业务的数据包。具体地，第一接入网设备发送至第二接入网设备的数据包包括第一数据包、第二数据包和第三数据包的至少一种。
其中，第一数据包可以为第一接入网设备成功接收的终端设备发送的数据包，即为第一接入网设备成功接收的上行数据包；第二数据包可以为第一接入网设备分配了计数值的数据包，即为第一接入网设备分配了计数值的下行数据包(包括第一接入网设备发送的下行数据包和未发送的下行数据包)，或者第二数据包可以为第一接入网设备分配了计数值但未收到终端设备接收成功指示的数据包，即为第一接入网设备分配了计数值但未收到终端设备接收成功指示的下行数据包(包括第一接入网设备发送的未收到终端设备接收成功指示的下行数据包和未发送的下行数据包，或者包括第一接入网设备未发送的下行数据包)；第三数据包可以为第一接入网设备从核心网设备接收的未分配计数值的数据包，即为第一接入网设备从核心网设备接收的未分配计数 值的下行数据包。其中，在数据包为PDCP数据包时，计数值包括超帧号(Hyper Frame Number，简称：HFN)和PDCP序列号(sequence number，简称SN)；或者，计数值即为SN。
可以理解的是，第二接入网设备可能支持重建立过程中终端设备在第一接入网设备的业务的数据包的全部或者部分传输至第二接入网设备。
通过本实施例的上述流程，实现了重建立过程中的第一接入网设备以及第二接入网设备之间的数据传输。这样，终端设备与该第二接入网设备重建立完成后，终端设备可以与第二接入网设备进行业务传输。
下面采用具体的实施例对上一实施例的方法进行详细的说明。
图4为本申请实施例提供的数据传输的方法的信令交互图二；如图4所示，本实施例的方法可以包括：
步骤S401、第二接入网设备向第一接入网设备发送第一消息，第一消息用于请求终端设备的上下文信息；
步骤S402、该第一接入网设备向该第二接入网设备发送第一响应消息，第一响应消息中包括该终端设备的上下文信息；
步骤S403、该第二接入网设备向该第一接入网设备发送PDU业务接收信息；
步骤S404、第一接入网设备向第二接入网设备发送数据包；
可选地，还可以包括步骤S405、第一接入网设备向第二接入网设备发送传输状态指示信息，传输状态指示信息指示终端设备在第一接入设备的业务对应的数据包的传输状态。
具体地，本实施例中的步骤S401的具体实现参见上一实施例中的步骤S301，本实施例中不再赘述。
对于步骤S402，该第一接入网设备在接收到该第二接入网设备发送的用于请求该终端设备的上下文信息的第一消息后，该第一接入网设备会向该第二接入网设备发送第一响应消息。
在一种可能的方式中，第一响应消息中携带有该终端设备的上下文信息。该终端设备的上下文信息中包括该终端设备在第一接入网设备的PDU会话资源信息，PDU会话资源信息中可以包括以下信息：PDU会话的标识和PDU会话对应的服务质量(Quality of Service，Qos)流的标识；进一步地，PDU会话资源信息还可以包括：DRB标识和Qos流标识的映射关系等。
其中，每个PDU会话对应有至少一个DRB。每个DRB可以承载上行和/或下行数据包。每个DRB对应至少一个Qos流。
对于步骤S403，第二接入网设备可以根据终端设备的上下文信息中的PDU会话资源信息，向第一接入网设备发送PDU业务接收信息。
具体地，该第二接入网设备接收该第一接入网设备发送的第一响应消息，并根据第一响应消息中终端设备的上下文信息中的PDU会话资源信息，向该第一接入网设备发送PDU业务接收信息。也就是说该第二接入网设备根据终端设备在第一接入网设备上的PDU会话资源信息，确定该终端设备在第一接入网设备上的哪些PDU会话可以接 受或者拒绝，和/或，哪些QoS流可以接受或者拒绝，和/或，哪些DRB上承载的数据需要转发。进一步地，第二接入网设备还会确定接受的PDU会话对应的通用分组无线服务隧穿协议(General Packet Radio Service Tunneling Protocol，简称GTP)通道地址，和/或，需要数据转发的DRB对应的上行GTP通道地址和/或下行GTP通道地址。GTP通道地址包括GTP通道的IP地址和/或端点标识。具体地，IP地址可以是传输层地址(Transport Layer Address，简称TLA)，端点标识可以是GTP通道端点标识(GTP Tunnel Endpoint identifier，简称GTP-TEID)。
即PDU业务接收信息可以包括如下中的任意一种：第二接入网设备接受的第一PDU会话的标识信息、第二接入网设备拒绝的第二PDU会话的标识信息。其中，第一PDU会话和第二PDU会话为终端设备在第一接入网设备上的PDU会话。其中，第一PDU会话会有至少一个，第二PDU会话可能为0个，可能为至少一个。
可选地，PDU业务接收信息还可以包括：第二信息，第二信息包括第一PDU会话对应的GTP通道地址。
可选地，PDU业务接收信息还可以包括以下信息的至少一种：第二接入网设备接受的第一QoS流的标识信息、第二接入网设备接受的第一QoS流的标识信息和相应的数据转发接受指示信息，该数据转发指示信息指示接受转发该第一Qos流的数据、第二接入网设备拒绝的第二QoS流的标识信息。其中，第一QoS流和第二QoS流为终端设备在第一接入网设备的业务对应的QoS流。可选地，第一QoS流会有至少一个，第二QoS流可能为0个，可能为至少一个。
作为一种实现方式，第一QoS流是第一PDU会话对应的QoS流，若存在第二QoS流，则第二QoS流也是第一PDU会话对应的QoS流。
可选地，PDU业务接收信息还可以包括：第一信息，第一信息包括需要数据转发的第一DRB的标识信息；进一步地，第一信息还包括第一DRB对应的上行GTP通道地址和/或下行GTP通道地址；第一DRB为终端设备在第一接入网设备的业务对应的DRB。
作为一个具体的实施例，示例如下。该终端设备在该第一接入网设备的业务对应有PDU会话1和PDU会话2。其中PDU会话1包括QoS流1和QoS流2，QoS流1和DRB1存在映射关系。PDU会话2包括QoS流3；第二接入网设备确定PDU会话1可以接受，PDU会话1的QoS流1可以接受，QoS流2拒绝接受，且接受QoS流1的数据转发，则第二消息中的PDU业务接收信息中可以包括接受的PDU会话1的标识信息(比如为1)、接收的QoS流1的标识信息(比如为1)和QoS流1的数据转发接受指示信息(比如为“数据转发接受”)，QoS流2的标识信息(比如为2)，DRB1对应的上行和/或下行GTP通道地址，以及包括拒绝的PDU会话2的标识信息为2(比如为2)。
对应于上述示例，PDU业务接收信息包括的信元如表1所示：
表1
Figure PCTCN2019100188-appb-000001
可选地，PDU业务接收信息中还可以包括拒绝第二PDU会话的原因。拒绝第二PDU会话的原因可能为目标小区(终端设备所在的第二接入网设备对应的小区)没有资源，或者目标小区不支持第二PDU会话等。
可选地，PDU业务接收信息中还可以指示拒绝第二Qos流的原因。拒绝第二Qos流的原因可能为目标小区没有资源，或者目标小区不支持第二Qos流等。其中，目标小区不支持第二Qos流，是指目标小区无法满足第二Qos流对应的Qos流参数对应的条件；Qos流参数可以包括如下中的至少一项：优先级、包延时规划、错包率、时延敏感指示、平均窗口、数据包最大突发量。
一种可能的方式中，上述的PDU业务接收信息可以携带在数据转发地址指示消息，比如DATA FORWARDING ADDRESS INDICATION消息，也可以携带在其它的消息中，还可以为独立的一条消息。
对于步骤S404，在一种实现方式中，第一接入网设备向第二接入网设备发送数据包包括：第一接入网设备根据接收到的PDU业务接收信息，向第二接入网设备发送数据包。
具体地，该第一接入网设备接收到PDU业务接收信息后，根据该PDU业务接收信息向第二接入网设备发送第二接入网设备接受的PDU会话和/或QoS流对应的数据包。具体为：第一接入网设备根据PDU业务接收信息中的PDU会话的GTP通道地址，向第二接入网设备发送第二接入网设备接受的PDU会话对应的数据包；和/或，第一接入网设备根据PDU业务接收信息中的PDU会话的GTP通道地址，和/或，DRB对应的上行GTP通道地址和/或下行GTP通道地址，向第二接入网设备发送第二接入网设备接受的QoS流对应的相应DRB承载的数据包。
对于步骤S405、第一接入网设备向第二接入网设备发送传输状态指示信息，传输状态指示信息用于指示终端设备在第一接入设备的业务对应的数据包的传输状态。在一种实现方式中，传输状态指示信息用于指示终端设备在第一接入设备的DRB承载的上行和/或下行PDCP数据包的传输状态。进一步地，传输状态指示信息用于指示第二接入网设备接受的需要数据转发的终端设备在第一接入网设备的第一DRB承载的上行和/或下行PDCP数据包的传输状态。
具体地，所有的第一数据包组成的集合为终端设备在第一接入设备的业务对应的所有的上行数据包组成的集合的子集，所有的第二数据包和所有的第三数据包组成的集合为终端设备在第一接入设备的业务对应的所有的下行数据包组成的集合的子集；其中，本实施中的第一数据包、第二数据包和第三数据包的含义参见图3所示的实施例中的阐述。
作为一种实现方式，上述的传输状态指示信息为单独的消息，比如序列状态转发(SN STATUS TRANSFER)消息。传输状态指示信息由第一接入网设备发送至第二接入网设备，此时，传输状态指示信息的发送可以在第一接入网设备接收到PDU业务接收信息之后。作为另一种实现方式，上述的传输状态指示信息也可以包含在步骤S402的第一响应消息中，即此时步骤S405不需要执行，此时，传输状态指示信息的发送在第一接入网设备接收到PDU业务接收信息之前。
其中，传输状态指示信息可以包括：DRB的标识信息，数据包的计数值的长度信息，第二接入网设备为下一个未分配计数值的下行数据包分配的计数值，也就是第二接入网设备为第一个第三数据包分配的计数值。
可选地，传输状态指示信息还可以包括第一接入网设备丢失的第一个上行数据包的计数值。其中，第一接入网设备丢失的第一个上行数据包为第一接入网设备未成功接收的第一个上行数据包。第二接入网设备可以根据该DRB承载的上行数据包中第一接入网设备丢失的第一个数据包的计数值，获知该DRB承载的上行数据包中第一接入网设备丢失的其它数据包的计数值。
可选地，传输状态指示信息还可以包括第一指示信息，用于指示终端设备发送的上行数据包是否被第一接入网设备成功接收。第一指示信息可以是一个比特串。作为一种实现方式，第一个比特用于指示DRB承载的上行数据包中第一接入网设备丢失的第一个上行数据包之后的第一个数据包是否被第一接入网设备成功接收。
第二接入网设备可以根据第一指示信息获知上行数据包是否被第一接入网设备成功接收。
可以理解的是，若传输状态指示信息的发送在第一接入网设备接收到PDU业务接收信息之后，传输状态指示信息可以用于指示第二接入网设备接受的需要数据转发的终端设备在第一接入网设备的第一DRB承载的上行和/或下行数据包的传输状态。具体地，“DRB的标识信息”为第一DRB的标识信息。进一步地，“数据包的计数值的长度信息”为第一DRB承载的上行和/或下行数据包的计数值的长度信息；“第二接入网设备为下一个未分配计数值的下行数据包分配的计数值”为第二接入网设备为第一DRB承载的下一个为分配计数值的下行数据包分配的计数值；“第一接入网设备丢失的第一个上行数据包的计数值”为第一DRB承载的上行数据包中第一接入网设备 丢失的第一个上行数据包的计数值；第一指示信息用于指示第一DRB承载的上行数据包是否被第一接入网设备成功接收。
若传输状态指示信息的发送在第一接入网设备接收到PDU业务接收信息之前，传输状态指示信息可包括终端设备在第一接入网设备上的全部DRB承载的上行和/或下行数据包的传输状态，具体内容参照上述阐述，不再赘述。
综上所述，第一接入网设备向第二接入网设备发送传输状态指示信息，可以使得终端设备在第一接入网设备的业务可以在第二接入网设备上继续正常的进行。
本实施例中，由于第一接入设备是根据第二接入网设备的PDU业务接收信息向第二接入网设备发送数据包，因此，可以尽量的减少第一接入网设备向第二接入网设备发送第二接入网设备拒绝的数据包，减少信令的开销。
应理解，上述各过程的序号的大小并不意味着执行顺序的先后(比如S405可以在S404之前执行)，也不意味着必须执行上述各过程的序号对应的步骤，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
下面对图4所示的实施例中的传输状态指示信息携带在第一响应消息中的数据传输的方法进行说明。图5为本申请实施例提供的数据传输的方法的信令交互图三；如图5所示，本实施例的方法可以包括：
步骤S501、第二接入网设备向第一接入网设备发送第一消息，第一消息用于请求终端设备的上下文信息；
步骤S502、该第一接入网设备向该第二接入网设备发送第一响应消息，第一响应消息中包括该终端设备的上下文信息；该上下文信息中包括该终端设备在第一接入网设备的PDU会话资源信息和传输状态指示信息。传输状态指示信息的描述参见步骤S405的描述，此处不再赘述。
步骤S503、该第二接入网设备向该第一接入网设备发送PDU业务接收信息；
步骤S504、第一接入网设备向第二接入网设备发送PDCP数据包。
具体地，本实施例中的步骤S501、步骤S503、步骤504分别参见图4所示的实施例中的步骤S401、步骤S403、步骤S404的阐述，本实施例中不再阐述。
对于步骤S502，参见图4所示的实施例中步骤S402和步骤S405的阐述，本实施例中不再阐述。
本实施例中，由于第一接入设备是根据第二接入网设备的PDU业务接收信息向第二接入网设备发送数据包的，因此，可以尽量的减少第一接入网设备向第二接入网设备发送第二接入网设备拒绝的数据包，减少信令的开销。
应理解，上述各过程的序号的大小并不意味着执行顺序的先后，也不意味着必须执行上述各过程的序号对应的步骤，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
图6为本申请实施例提供的数据传输的方法的信令交互图四；如图6所示，本实施例的方法可以包括：
步骤S601、终端设备向第二接入网设备发送重建立请求；
具体地，在该终端设备与该第一接入网设备的连接断开后，该终端设备向该第二接入网设备发送重建立请求。
步骤S602、第二接入网设备向第一接入网设备发送第一消息，第一消息用于请求终端设备的上下文信息；
本实施例中，第一消息可以是获取终端设备上下文请求(RETRIEVE UE CONTEXT REQUEST)消息。
步骤S603、第一接入网设备向第二接入网设备发送第一响应消息。
该第一响应消息中包括该终端设备的上下文信息；该终端设备的上下文信息包括该终端设备在第一接入网设备的PDU会话资源信息；
本实施例中，第一响应消息可以是获取终端设备上下文响应(RETRIEVE UE CONTEXT RESPONSE)消息。
步骤S604、第二接入网设备向第一接入网设备发送PDU业务接收信息。
具体地，第二接入网设备根据该终端设备在第一接入网设备的PDU会话资源信息向第一接入网设备发送第二接入网设备的PDU业务接收信息；
本实施例中，PDU业务接收信息可以携带在数据转发地址指示(DATA FORWARDING ADDRESS INDICATION)消息中，也可是一条独立的消息。
步骤S605、第一接入网设备向第二接入网设备发送数据包；
具体地，第一接入网设备根据PDU业务接收信息，向第二接入网设备发送数据包；
步骤S606、第一接入网设备向第二接入网设备发送传输状态指示信息，传输状态指示信息用于指示终端设备在第一接入网设备的业务对应的数据包的传输状态；
传输状态指示信息可为序列号状态转发(SN STATUS TRANSFER)消息。传输状态指示信息还可以携带在第一响应消息中，此时不再有步骤S606。
步骤S607、第二接入网设备发送重建立消息至终端设备；
步骤S608、终端设备发送重建立完成消息至第二接入网设备；
具体地，本实施例中，第一接入网设备为终端设备在重建立过程之前对应的接入网设备，第二接入网设备为该终端设备与该第一接入网设备之间的连接断开后，发起重建立过程对应的接入网设备，也就是该终端设备请求建立连接的接入网设备。
本实施例中的步骤S602～步骤S606参照图4所示的实施中的阐述，本实施例中不再赘述。
应理解，上述各过程的序号的大小并不意味着执行顺序的先后(比如终端设备和接入网设备间的过程，和，接入网设备间的过程的执行顺序并不限定)，也不意味着必须执行上述各过程的序号对应的步骤，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
本实施例实现了获取终端设备上下文信息的重建立过程中的第一接入网设备以及第二接入网设备之间的数据传输；且由于第一接入设备是根据第二接入网设备的PDU业务接收信息向第二接入网设备发送数据包的，因此，可以尽量的减少第一接入网设备向第二接入网设备发送第二接入网设备拒绝的数据包，减少信令的开销。
下面对第二接入网设备不支持重建立过程下的数据传输的方法进行说明。比如第 二接入网设备资源紧张，或者第二接入网设备不具有相关能力的场景。
图7为本申请实施例提供的数据传输的方法的信令交互图五；如图7所示，本实施例的方法可以包括：
步骤S701、终端设备发送重建立请求消息至第二接入网设备；当终端设备与第一接入网设备之间的连接断开时，终端设备发送重建立请求消息至第二接入网设备。
步骤S702、第二接入网设备发送第一重置指示信息至终端设备；该第一重置指示信息指示重置上行的数据包计数值，以及删除第一数据包集中的数据包；其中，第一数据包集为终端设备从第一接入网设备接收到的下行数据包组成的集合，或者，第一数据包集为终端设备从第一接入网设备接收到的下行数据包和已经分配计数值的上行数据包组成的集合；第一接入网设备为所述终端设备在重建立过程之前对应的接入网设备。
具体地，在一种实现方式中，该第一重置指示信息可以携带在第二接入网设备向终端设备发送的重建立消息中，在该实现方式中，步骤S701的执行顺序在步骤S702之前.
在另一种实现方式中，该第一重置指示信息携带在第二接入网设备广播的系统消息中。可以理解地，在该实现方式中，步骤S702的执行顺序在步骤S701之前。
在另一种实现方式中，该第一重置指示信息是第二接入网设备基于终端设备发送的请求发送重置指示信息发送至终端设备的。
步骤S703、终端设备根据第一重置指示信息，重置上行的数据包计数值，以及删除第一数据包集中的数据包。
其中，第一重置指示信息也用于向终端设备指示第二接入网设备不支持第一接入网设备的数据转发。
可以理解地，图4～图6所示的实施例中，终端设备可能会接收到第二重置指示信息，第二重置指示信息指示终端设备不需要重置上行的数据包计数值，以及不需要删除第一数据包集中的数据包；也可以说，第二重置指示信息也用于向终端设备指示第二接入网设备支持第一接入网设备的数据转发。
步骤S704、第二接入网设备发送第二指示信息至第一接入网设备，第二指示信息指示第一接入网设备不发送数据包至第二接入网设备。
即若第二接入网设备发送的第一重置指示信息至终端设备，则第二接入网设备还会发送第二指示信息至第一接入网设备。第一接入网设备接收到第二指示信息后，不向第二接入网设备发送数据包。
本实施例中，在第二接入网设备不支持数据传输的场景下，终端设备重置上行数据包的计数值，以及删除第一数据包集中的数据包，这样终端设备在与第二接入网设备重建立完成后，根据重置计数值的上行数据包与第二接入网设备重新进行业务。
应理解，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定(比如步骤S701可以在步骤S702之前，步骤S701还可以在步骤S702之后)，而不应对本申请实施例的实施过程构成任何限定。
下面对第二接入网设备不支持重建立过程下的数据传输的另一种方法进行说明。
图8为本申请实施例提供的方法的信令交互图六，参见图8，本实施例的方法可以包括：
步骤S801、终端设备确定发起重建立请求的小区和终端设备检测到连接失败的小区是否为同一小区；
步骤S802、若不为同一小区，终端设备重置上行数据包的计数值，以及删除第一数据包集中的数据包；其中，第一数据包集为终端设备接收到的下行数据包组成的集合，或者，第一数据包集为终端设备接收到的下行数据包和已经分配计数值的上行数据包组成的集合。
具体地，本实施例中与图7所示的实施例不相同之处为终端设备默认第二接入网设备不支持重建立过程下的数据传输，终端设备只要检测发起重建立过程的小区不同于之前的服务小区，则重置上行数据包的计数值，以及删除第一数据包集中的数据包。
本实施例中，在第二接入网设备不支持数据传输的场景下，终端设备重置上行数据包的计数值，以及删除第一数据包集中的数据包，这样终端设备在与第二接入网设备重建立完成后，根据重置计数值的上行数据包与第二接入网设备重新进行业务。
应理解，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
可以理解的是，上述各个实施例中，由第一接入网设备实现的方法，也可以由可用于第一接入网设备的部件(例如芯片或者电路)实现，上述各个实施例中，由第二接入网设备实现的方法，也可以由可用于第二，接入网设备的部件(例如芯片或者电路)实现，上述各个实施例中，由终端设备实现的方法，也可以由可用于终端设备的部件(例如芯片或者电路)实现。
图9为本申请一实施例提供的一种通信装置的结构示意图一。如图9所示，本实施例所述的通信装置500可以是前述方法实施例中提到的第一接入网设备(或者可用于第一接入网设备的部件)或者第二接入网设备(或者可用于第二接入网设备的部件)或者是前述方法实施例中提到的终端设备(或者可用于终端设备的部件)。通信装置可用于实现上述方法实施例中描述的对应于终端设备或者第一接入网设备或者第二接入网设备的方法，具体参见上述方法实施例中的说明。
所述通信装置500可以包括一个或多个处理器501，所述处理器501也可以称为处理单元，可以实现一定的控制或者处理功能。所述处理器501可以是通用处理器或者专用处理器等。例如可以是基带处理器、或中央处理器。基带处理器可以用于对通信协议以及通信数据进行处理，中央处理器可以用于对通信装置进行控制，执行软件程序，处理软件程序的数据。
在一种可选的设计中，处理器501也可以存有指令503或者数据(例如中间数据)。其中，所述指令503可以被所述处理器运行，使得所述通信装置500执行上述方法实施例中描述的对应于终端设备或者第一接入网设备或者第二接入网设备的方法。
在又一种可能的设计中，通信装置500可以包括电路，所述电路可以实现前述方法实施例中发送或接收或者通信的功能。
可选的，所述通信装置500中可以包括一个或多个存储器502，其上可以存有指令504，所述指令可在所述处理器上被运行，使得所述通信装置500执行上述方法实 施例中描述的方法。
可选的，所述存储器中也可以是存储有数据。所述处理器和存储器可以单独设置，也可以集成在一起。
可选的，所述通信装置500还可以包括收发器505和/或天线506。所述处理器501可以称为处理单元，对通信装置(终端设备或者网络设备)进行控制。所述收发器505可以称为收发单元、收发机、收发电路、或者收发器等，用于实现通信装置的收发功能。
上述收发器505与处理器501的具体实现过程可以参见上述各实施例的相关描述，此处不再赘述。
本申请中描述的处理器501和收发器505可实现在集成电路(integrated circuit，IC)、模拟IC、射频集成电路(radio frequency integrated circuit，RFIC)、混合信号IC、专用集成电路(application specific integrated circuit，ASIC)、印刷电路板(printed circuit board，PCB)、电子设备等上。该处理器和收发器也可以用各种1C工艺技术来制造，例如互补金属氧化物半导体(complementary metal oxide semiconductor，CMOS)、N型金属氧化物半导体(nMetal-oxide-semiconductor，NMOS)、P型金属氧化物半导体(positive channel metal oxide semiconductor，PMOS)、双极结型晶体管(Bipolar Junction Transistor，BJT)、双极CMOS(BiCMOS)、硅锗(SiGe)、砷化镓(GaAs)等。
虽然在以上的实施例描述中，通信装置500以终端设备或者网络设备为例来描述，但本申请中描述的通信装置的范围并不限于上述终端设备或上述网络设备，而且通信装置的结构可以不受图5的限制。通信装置500可以是独立的设备或者可以是较大设备的一部分。例如所述设备可以是：
(1)独立的集成电路IC，或芯片，或，芯片系统或子系统；
(2)具有一个或多个IC的集合，可选的，该IC集合也可以包括用于存储数据和/或指令的存储部件；
(3)ASIC，例如调制解调器(MSM)；
(4)可嵌入在其他设备内的模块；
(5)接收机、终端设备、蜂窝电话、无线设备、手持机、移动单元，网络设备等等；
(6)其他等等。
图10为本申请实施例提供的一种终端设备的结构示意图。该终端设备可适用于本申请上述各实施例中所述的终端设备。为了便于说明，图10仅示出了终端设备的主要部件。如图10所示，终端设备600包括处理器、存储器、控制电路、天线以及输入输出装置。处理器主要用于对通信协议以及通信数据进行处理，以及对整个终端设备进行控制，执行软件程序，处理软件程序的数据。存储器主要用于存储软件程序和数据。射频电路主要用于基带信号与射频信号的转换以及对射频信号的处理。天线主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。
当终端设备开机后，处理器可以读取存储单元中的软件程序，解释并执行软件程序的指令，处理软件程序的数据。当需要通过无线发送数据时，处理器对待发送的数 据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端设备时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。
本领域技术人员可以理解，为了便于说明，图10仅示出了一个存储器和处理器。在实际的终端设备中，可以存在多个处理器和存储器。存储器也可以称为存储介质或者存储设备等，本申请实施例对此不做限制。
作为一种可选的实现方式，处理器可以包括基带处理器和中央处理器，基带处理器主要用于对通信协议以及通信数据进行处理，中央处理器主要用于对整个终端设备进行控制，执行软件程序，处理软件程序的数据。图10中的处理器集成了基带处理器和中央处理器的功能，本领域技术人员可以理解，基带处理器和中央处理器也可以是各自独立的处理器，通过总线等技术互联。本领域技术人员可以理解，终端设备可以包括多个基带处理器以适应不同的网络制式，终端设备可以包括多个中央处理器以增强其处理能力，终端设备的各个部件可以通过各种总线连接。所述基带处理器也可以表述为基带处理电路或者基带处理芯片。所述中央处理器也可以表述为中央处理电路或者中央处理芯片。对通信协议以及通信数据进行处理的功能可以内置在处理器中，也可以以软件程序的形式存储在存储单元中，由处理器执行软件程序以实现基带处理功能。
图11为本申请实施例提供的数据传输设备的结构示意图一，参见图11，该数据传输设备包括接收模块701和发送模块702；
所述接收模块701，用于从第二接入网设备获取第一消息，所述第一消息用于请求终端设备的上下文信息；
所述发送模块702，用于向所述第二接入网设备发送数据包；
其中，所述数据传输设备为所述终端设备在重建立过程之前对应的接入网设备，所述第二接入网设备为所述终端设备发起重建立过程对应的接入网设备。
可选地，所述接收模块701，还用于从所述第二接入网设备获取协议数据单元PDU业务接收信息，所述PDU业务接收信息包括所述第二接入网设备接受的第一PDU会话的标识信息和/或拒绝的第二PDU会话的标识信息；所述第一PDU会话和所述第二PDU会话为所述终端设备在所述数据传输设备的PDU会话；
所述发送模块702，具体用于：根据所PDU业务接收信息发送所述数据包。
可选地，所述PDU业务接收信息还包括：所述第二接入网设备接受的第一服务质量QoS流的标识信息和/或拒绝的第二QoS流的标识信息；所述第一QoS流和所述第二QoS流为所述终端设备在所述数据传输设备的业务对应的QoS流。
可选地，所述PDU业务接收信息还包括：第一信息和/或第二信息；
所述第一信息包括需要数据转发的第一数据承载DRB的标识信息，以及所述第一DRB对应的上行和/或下行通用分组无线服务隧穿协议GTP通道地址，其中，所述第一DRB为所述终端设备在所述第一接入网设备的业务对应的DRB；所述第二信息包括所述第一PDU会话对应的GTP通道地址。
可选地，所述发送模块702，还用于向所述第二接入网设备发送传输状态指示信息，所述传输状态指示信息用于指示终端设备在所述数据传输设备的业务的数据包的传输状态；
所述传输状态指示信息包括：
DRB的标识信息；
数据包的计数值的长度信息，以及
所述第二接入网设备为下一个未分配计数值的下行数据包分配的计数值。
可选地，所述传输状态指示信息还包括如下中的至少一项：
所述数据传输设备丢失的第一个上行数据包的计数值；
用于指示所述终端设备发送的上行数据包是否被所述数据传输设备成功接收的第一指示信息。
本实施例的数据传输设备，可以用于执行上述图3～图6所示的方法实施例中第一接入网设备的技术方案，其实现原理和技术效果类似，此处不再赘述。
图12为本申请实施例提供的数据传输设备的结构示意图二，参见图12，该数据传输设备包括：接收模块801；
接收模块801，用于从第二接入网设备获取第二指示信息，所述第二指示信息指示所述数据传输设备不发送数据包至所述第二接入网设备。
本实施例的数据传输设备，可以用于执行上述图7所示实施例中第一接入网设备的技术方案，其实现原理和技术效果类似，此处不再赘述。
图13为本申请实施例提供的数据传输设备的结构示意图三，参见图13，该数据传输设备包括：接收模块901和发送模块902；
所述发送模块902，用于向第一接入网设备发送第一消息，所述第一消息用于请求终端设备的上下文信息；
所述接收模块901，用于从所述第一接入网设备接收数据包；
其中，所述第一接入网设备为所述终端设备在重建立过程之前对应的接入网设备，所述数据传输设备为所述终端设备发起重建立过程对应的接入网设备。
可选地，所述发送模块902，还用于向所述第一接入网设备发送协议数据单元PDU业务接收信息，所述PDU业务接收信息包括所述数据传输设备接受的第一PDU会话资源的标识信息和/或拒绝的第二PDU会话资源的标识信息；所述第一PDU会话和所述第二PDU会话为所述终端设备在所述第一接入网设备的PDU会话。
可选地，所述PDU业务接收信息中还包括：所述数据传输设备接受的第一服务质量Qos流的标识信息和/或拒绝的第二Qos流的标识信息；所述第一Qos流和所述第二Qos流为所述终端设备在所述第一接入网设备的业务对应的Qos流。
可选地，所述PDU业务接收信息还包括：第一信息和/或第二信息；
所述第一信息包括需要数据转发的第一数据承载DRB的标识信息，以及所述第一DRB对应的上行和/或下行通用分组无线服务隧穿协议GTP通道地址，其中，所述第一DRB为所述终端设备在所述第一接入网设备的业务对应的DRB；所述第二信息包 括所述第一PDU会话对应的GTP通道地址。
可选地，所述接收模块901，还用于从所述第一接入网设备获取传输状态指示信息，所述传输状态指示信息用于指示终端设备在所述第一接入网设备的业务的数据包的传输状态；
所述传输状态指示信息包括：
DRB的标识信息；
数据包的计数值的长度信息，以及
所述数据传输设备为下一个未分配计数值的下行数据包分配的计数值。
可选地，所述传输状态指示信息还包括如下中的至少一项：
所述第一接入网设备丢失的第一个上行数据包的计数值；
用于指示所述终端设备发送的上行数据包是否被所述第一接入网设备成功接收的第一指示信息。
本实施例的数据传输设备，可以用于执行上述图3～图6所示的方法实施例中第二接入网设备的技术方案，其实现原理和技术效果类似，此处不再赘述。
图14为本申请实施例提供的数据传输设备的结构示意图四，参见图14，该数据传输设备包括：接收模块1001和发送模块1002；
接收模块1001，用于从终端设备获取重建立请求消息；
发送模块1002，用于发送第一重置指示信息至终端设备，该第一重置指示信息指示重置上行的数据包计数值，以及删除第一数据包集中的数据包；其中，第一数据包集为终端设备从第一接入网设备接收到的下行数据包组成的集合，或者，第一数据包集为终端设备从所述第一接入网设备接收到的下行数据包和已经分配计数值的上行数据包组成的集合
发送模块1002，还用于发送第二指示信息至所述第一接入网设备，所述第二指示信息指示所述第一接入网设备不发送数据包至所述数据传输设备。
本实施例的数据传输设备，可以用于执行上述图7所示的方法实施例中第二接入网设备的技术方案，其实现原理和技术效果类似，此处不再赘述。
图15为本申请实施例提供的一种通信装置的结构示意图二，参见图15，该通信装置包括：发送模块1101、接收模块1102和重置模块1103。
所述发送模块1101，用于发送重建立请求消息至第二接入网设备；所述第二接入网设备为所述终端设备发起重建立过程对应的接入网设备；
所述接收模块1102，用于从所述第二接入网设备获取第一重置指示信息，该第一重置指示信息指示重置上行的数据包计数值，以及删除第一数据包集中的数据包；其中，第一数据包集为所述终端设备从第一接入网设备接收到的下行数据包组成的集合，或者，第一数据包集为所述终端设备从第一接入网设备接收到下行数据包和已经分配计数值的上行数据包组成的集合；所述第一接入网设备为所述终端设备在重建立过程之前对应的接入网设备。
所述重置模块1103，用于根据所述第一重置指示信息，重置上行的数据包计数值， 以及删除第一数据包集中的数据包。
本实施例的通信装置，可以用于执行图7所示的方法实施例中终端设备执行的技术方案，其实现原理和技术效果类似，此处不再赘述。可以理解的是，本实施例中的通信装置，可以为终端设备，也可以为可用于终端设备的部件，本申请实施例对此不做限定。
图16为本申请实施例提供的一种通信装置的结构示意图三，参见图16，该终端设备包括：确定模块1201和重置模块1202。
确定模块1201，用于确定发起重建立请求的小区和终端设备检测到连接失败的小区是否为同一小区；
重置模块1202，用于若发起重建立请求的小区和终端设备检测到连接失败的小区不为同一小区，则重置上行数据包的计数值，以及删除第一数据包集中的数据包；其中，第一数据包集为终端设备接收到的下行数据包组成的集合，或者，第一数据包集为终端设备接收到的下行数据包和已经分配计数值的上行数据包组成的集合。
本实施例的通信装置，可以用于执行图8所示的方法实施例中终端设备执行的技术方案，其实现原理和技术效果类似，此处不再赘述。可以理解的是，本实施例中的通信装置，可以为终端设备，也可以为可用于终端设备的部件，本申请实施例对此不做限定。
需要说明的是，本申请实施例中对模块的划分是示意性的，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。在本申请的实施例中的各功能模块可以集成在一个处理模块中，也可以是各个模块单独物理存在，也可以两个或两个以上模块集成在一个模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。
所述集成的模块如果以软件功能模块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，本申请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)执行本申请各个实施例所述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(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机 可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘Solid State Disk(SSD))等。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (28)

  1. 一种数据传输方法，其特征在于，包括：
    第一接入网设备从第二接入网设备获取第一消息，所述第一消息用于请求终端设备的上下文信息；
    所述第一接入网设备向所述第二接入网设备发送数据包；
    其中，所述第一接入网设备为所述终端设备在重建立过程之前对应的接入网设备，所述第二接入网设备为所述终端设备发起重建立过程对应的接入网设备。
  2. 根据所述权利要求1所述的方法，其特征在于，还包括：
    所述第一接入网设备从所述第二接入网设备获取所述第二接入网设备的协议数据单元PDU业务接收信息，所述PDU业务接收信息包括所述第二接入网设备接受的第一PDU会话的标识信息和/或拒绝的第二PDU会话的标识信息；所述第一PDU会话和所述第二PDU会话为所述终端设备在所述第一接入网设备的PDU会话；
    所述第一接入网设备向所述第二接入网设备发送数据包，包括：
    所述第一接入网设备根据所PDU业务接收信息发送所述数据包。
  3. 根据所述权利要求2所述的方法，其特征在于，所述PDU业务接收信息还包括：所述第二接入网设备接受的第一服务质量QoS流的标识信息和/或拒绝的第二QoS流的标识信息；所述第一QoS流和所述第二QoS流为所述终端设备在所述第一接入网设备的业务对应的QoS流。
  4. 根据权利要求2或3所述的方法，其特征在于，所述PDU业务接收信息还包括：第一信息和/或第二信息；
    所述第一信息包括需要数据转发的第一数据承载DRB的标识信息，以及所述第一DRB对应的上行和/或下行通用分组无线服务隧穿协议GTP通道地址，其中，所述第一DRB为所述终端设备在所述第一接入网设备的业务对应的DRB；所述第二信息包括所述第一PDU会话对应的GTP通道地址。
  5. 根据权利要求2～4任一项所述的方法，其特征在于，还包括：
    所述第一接入网设备向所述第二接入网设备发送传输状态指示信息，所述传输状态指示信息用于指示所述终端设备在所述第一接入网设备的业务的数据包的传输状态；
    所述传输状态指示信息包括：
    DRB的标识信息，数据包的计数值的长度信息，以及
    所述第二接入网设备为下一个未分配计数值的下行数据包分配的计数值。
  6. 根据权利要求5所述的方法，其特征在于，所述传输状态指示信息还包括如下至少一项：
    所述第一接入网设备丢失的第一个上行数据包的计数值；
    用于指示所述终端设备发送的上行数据包是否被所述第一接入网设备成功接收的第一指示信息。
  7. 一种数据传输的方法，其特征在于，包括：
    第二接入网设备向第一接入网设备发送第一消息，所述第一消息用于请求终端设备的上下文信息；
    所述第二接入网设备从所述第一接入网设备接收数据包；
    其中，所述第一接入网设备为所述终端设备在重建立过程之前对应的接入网设备，所述第二接入网设备为所述终端设备发起重建立过程对应的接入网设备。
  8. 根据所述权利要求7所述的方法，其特征在于，还包括：
    所述第二接入网设备向所述第一接入网设备发送协议数据单元PDU业务接收信息，所述PDU业务接收信息包括所述第二接入网设备接受的第一PDU会话资源的标识信息和/或拒绝的第二PDU会话资源的标识信息；所述第一PDU会话和所述第二PDU会话为所述终端设备在所述第一接入网设备的PDU会话。
  9. 根据所述权利要求8所述的方法，其特征在于，所述PDU业务接收信息中还包括：所述第二接入网设备接受的第一服务质量Qos流的标识信息和/或拒绝的第二Qos流的标识信息；所述第一Qos流和所述第二Qos流为所述终端设备在所述第一接入网设备的业务对应的Qos流。
  10. 根据权利要8或9所述的方法，其特征在于，
    所述PDU业务接收信息还包括：第一信息和/或第二信息；
    所述第一信息包括需要数据转发的第一数据承载DRB的标识信息，以及所述第一DRB对应的上行和/或下行通用分组无线服务隧穿协议GTP通道地址，其中，所述第一DRB为所述终端设备在所述第一接入网设备的业务对应的DRB；所述第二信息包括所述第一PDU会话对应的GTP通道地址。
  11. 根据权利要求8～10任一项所述的方法，其特征在于，还包括：
    所述第二接入网设备从所述第一接入网设备获取传输状态指示信息，所述传输状态指示信息用于指示所述终端设备在所述第一接入网设备的业务的数据包的传输状态；
    所述传输状态指示信息包括：
    DRB的标识信息；
    数据包的计数值的长度信息，以及
    所述第二接入网设备为下一个未分配计数值的下行数据包分配的计数值。
  12. 根据权利要求11所述的方法，其特征在于，所述传输状态指示信息还包括如下中的至少一项：
    所述第一接入网设备丢失的第一个上行数据包的计数值；
    用于指示所述终端设备发送的上行数据包是否被所述第一接入网设备成功接收的第一指示信息。
  13. 一种数据传输设备，其特征在于，包括接收模块和发送模块；
    所述接收模块，用于从第二接入网设备获取第一消息，所述第一消息用于请求终端设备的上下文信息；
    所述发送模块，用于向所述第二接入网设备发送数据包；
    其中，所述数据传输设备为所述终端设备在重建立过程之前对应的接入网设备，所述第二接入网设备为所述终端设备发起重建立过程对应的接入网设备。
  14. 根据所述权利要求13所述的设备，其特征在于，
    所述接收模块，还用于从所述第二接入网设备获取协议数据单元PDU业务接收信息，所述PDU业务接收信息包括所述第二接入网设备接受的第一PDU会话的标识信 息和/或拒绝的第二PDU会话的标识信息；所述第一PDU会话和所述第二PDU会话为所述终端设备在所述数据传输设备的PDU会话；
    所述发送模块，具体用于：根据所PDU业务接收信息发送所述数据包。
  15. 根据所述权利要求14所述的设备，其特征在于，所述PDU业务接收信息还包括：所述第二接入网设备接受的第一服务质量QoS流的标识信息和/或拒绝的第二QoS流的标识信息；所述第一QoS流和所述第二QoS流为所述终端设备在所述数据传输设备的业务对应的QoS流。
  16. 根据权利要求14或15所述的设备，其特征在于，
    所述PDU业务接收信息还包括：第一信息和/或第二信息；
    所述第一信息包括需要数据转发的第一数据承载DRB的标识信息，以及所述第一DRB对应的上行和/或下行通用分组无线服务隧穿协议GTP通道地址，其中，所述第一DRB为所述终端设备在所述第一接入网设备的业务对应的DRB；所述第二信息包括所述第一PDU会话对应的GTP通道地址。
  17. 根据权利要求14～16任一项所述的设备，其特征在于，所述发送模块，还用于向所述第二接入网设备发送传输状态指示信息，所述传输状态指示信息用于指示终端设备在所述数据传输设备的业务的数据包的传输状态；
    所述传输状态指示信息包括：
    DRB的标识信息；
    数据包的计数值的长度信息，以及
    所述第二接入网设备为下一个未分配计数值的下行数据包分配的计数值。
  18. 根据权利要求17所述的设备，其特征在于，所述传输状态指示信息还包括如下中的至少一项：
    所述数据传输设备丢失的第一个上行数据包的计数值；
    用于指示所述终端设备发送的上行数据包是否被所述数据传输设备成功接收的第一指示信息。
  19. 一种数据传输设备，其特征在于，包括：接收模块和发送模块；
    所述发送模块，用于向第一接入网设备发送第一消息，所述第一消息用于请求终端设备的上下文信息；
    所述接收模块，用于从所述第一接入网设备接收数据包；
    其中，所述第一接入网设备为所述终端设备在重建立过程之前对应的接入网设备，所述数据传输设备为所述终端设备发起重建立过程对应的接入网设备。
  20. 根据所述权利要求19所述的设备，其特征在于，所述发送模块，还用于向所述第一接入网设备发送协议数据单元PDU业务接收信息，所述PDU业务接收信息包括所述数据传输设备接受的第一PDU会话资源的标识信息和/或拒绝的第二PDU会话资源的标识信息；所述第一PDU会话和所述第二PDU会话为所述终端设备在所述第一接入网设备的PDU会话。
  21. 根据所述权利要求20所述的设备，其特征在于，所述PDU业务接收信息中还包括：所述数据传输设备接受的第一服务质量Qos流的标识信息和/或拒绝的第二Qos流的标识信息；所述第一Qos流和所述第二Qos流为所述终端设备在所述第一接 入网设备的业务对应的Qos流。
  22. 根据权利要20或21所述的设备，其特征在于，
    所述PDU业务接收信息还包括：第一信息和/或第二信息；
    所述第一信息包括需要数据转发的第一数据承载DRB的标识信息，以及所述第一DRB对应的上行和/或下行通用分组无线服务隧穿协议GTP通道地址，其中，所述第一DRB为所述终端设备在所述第一接入网设备的业务对应的DRB；所述第二信息包括所述第一PDU会话对应的GTP通道地址。
  23. 根据权利要求20～22任一项所述的设备，其特征在于，所述接收模块，还用于从所述第一接入网设备获取传输状态指示信息，所述传输状态指示信息用于指示终端设备在所述第一接入网设备的业务的数据包的传输状态；
    所述传输状态指示信息包括：
    DRB的标识信息；
    数据包的计数值的长度信息，以及
    所述数据传输设备为下一个未分配计数值的下行数据包分配的计数值。
  24. 根据权利要求23所述的设备，其特征在于，所述传输状态指示信息还包括如下中的至少一项：
    所述第一接入网设备丢失的第一个上行数据包的计数值；
    用于指示所述终端设备发送的上行数据包是否被所述第一接入网设备成功接收的第一指示信息。
  25. 一种通信装置，其特征在于，用于实现如权利要求1-6任一项或者7-12任一项所述的通信方法。
  26. 一种可读存储介质，其特征在于，所述可读存储介质上存储有计算机程序；所述计算机程序被执行时，实现如权利要求1-6任一项或者7-12任一项所述的方法。
  27. 一种通信系统，其特征在于，包括用于实现权利要求1-6任一项所述的通信方法的通信装置，以及用于实现权利要求7-12任一项所述的通信方法的通信装置。
  28. 根据权利要求27所述的通信系统，其特征在于，所述通信系统还包括终端设备。
PCT/CN2019/100188 2018-08-10 2019-08-12 数据传输的方法和设备 WO2020030176A1 (zh)

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