WO2022141548A1 - 一种数据传输方法及装置 - Google Patents

一种数据传输方法及装置 Download PDF

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Publication number
WO2022141548A1
WO2022141548A1 PCT/CN2020/142458 CN2020142458W WO2022141548A1 WO 2022141548 A1 WO2022141548 A1 WO 2022141548A1 CN 2020142458 W CN2020142458 W CN 2020142458W WO 2022141548 A1 WO2022141548 A1 WO 2022141548A1
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WIPO (PCT)
Prior art keywords
network device
access network
data packet
indication information
session
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PCT/CN2020/142458
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English (en)
French (fr)
Inventor
许斌
李秉肇
曹振臻
王燕
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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.)
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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 PCT/CN2020/142458 priority Critical patent/WO2022141548A1/zh
Priority to EP21912659.6A priority patent/EP4247054A4/en
Priority to PCT/CN2021/084794 priority patent/WO2022141889A1/zh
Priority to CN202180079178.8A priority patent/CN116548012A/zh
Publication of WO2022141548A1 publication Critical patent/WO2022141548A1/zh
Priority to US18/344,426 priority patent/US20230345323A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/026—Multicasting of data during hand-off
    • 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
    • H04W36/0007—Control or signalling for completing the hand-off for multicast or broadcast services, e.g. MBMS
    • 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
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • 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
    • H04W36/0044—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information of quality context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup

Definitions

  • the embodiments of the present application relate to the field of communication technologies, and in particular, to a data transmission method and apparatus.
  • MBS multicast and broadcast service
  • the core network device obtains the MBS service data from the MBS service server, it will send the MBS service data to the base station through the MBS session, and then the base station will send the MBS service data to the user equipment (UE) through the radio bearer.
  • the core network device obtains the MBS service data from the MBS service server, it will send the MBS service data to the base station through the MBS session, and then the base station will send the MBS service data to the user equipment (UE) through the radio bearer.
  • UE user equipment
  • Embodiments of the present application provide a data transmission method and apparatus, which can reduce the loss of data packets during user equipment handover.
  • an embodiment of the present application provides a data transmission method, including: a first access network device receives first indication information, and the first access network device determines, according to the first indication information, a QoS flow of a first session to a wireless The mapping relationship of the bearer is a first mapping relationship; and the first access network device transmits the data packet from the first session according to the first mapping relationship.
  • the first access network device determines the mapping relationship between the QoS flow of the first session and the radio bearer as the first mapping relationship according to the instructions of the core network device, and transmits data packets according to the first mapping relationship, which can reduce the number of users Loss of data packets during device switching, thereby providing better communication services for user equipment.
  • the above-mentioned first mapping relationship is a one-to-one mapping between the QoS flow of the first session and the radio bearer, or the mapping of all QoS flows of the first session and the same radio bearer.
  • the above-mentioned transmission of the data packets from the first session according to the first mapping relationship specifically includes: the first mapping relationship is a one-to-one mapping between the QoS flow of the first session and the radio bearer, and the first access network device
  • the PDCP sequence number of the data packet is set according to the QFI sequence number of the data packet, and the data packet is sent;
  • the first mapping relationship is that all QoS flows of the first session are mapped to the same radio bearer, and the first access network device is based on the GTP- U sequence number sets the PDCP sequence number of the data, and sends the packet.
  • the core network device after the core network device acquires a data packet of a certain service, the core network device adds a core network serial number, such as a GTP-U serial number, to each data packet, and also can add a QFI to each data packet Sequence number, the core network device can set the GTP-U sequence number and/or QFI sequence number for each data packet; then the core network device sends the data packet to the access network device, and the access network device receives the data packet and establishes a session
  • the mapping of the QoS flow to the radio bearer that is, the data packets of the QoS flow need to be transmitted through the mapped radio bearer.
  • the radio bearer corresponds to the PDCP one-to-one, so the PDCP is used to refer to the radio bearer.
  • the access network device removes the packet header containing the GTP-U sequence number and/or the QFI sequence number, it transmits the data packet to the PDCP entity, and the PDCP entity of the access network device sets the PDCP sequence number for the data packet, and then based on the corresponding
  • the radio bearer sends the data packet to the user equipment after being processed by each protocol layer entity.
  • both the source access network device and the target access network device of the user equipment set the PDCP sequence number of the data packet according to this method.
  • the user equipment is switched from the first access network device to the second access network device, due to the PDCP sequence numbers set by the first access network device and the second access network device for the same data packets in the same QoS flow are the same, and the mapping relationship between QoS flows and radio bearers is also the same. Therefore, when the UE switches between different access network devices, it can determine the progress of data packet transmission by the access network device according to the PDCP sequence number, and can The data forwarding technology or data buffering technology is used to reduce the loss of data packets during the switching process of the user equipment.
  • the PDCP sequence number set by the first access network device and the second access network device for the same data packet of the same session are the same, and the mapping relationship between QoS flows and radio bearers is also the same. Therefore, when the UE switches between different access network devices, it can determine the progress of data packet transmission by the access network device according to the PDCP sequence number, and can The data forwarding technology or data buffering technology is used to reduce the loss of data packets during the switching process of the user equipment.
  • the above-mentioned first mapping relationship is a one-to-one mapping between the QoS flow of the first session and the radio bearer, and the PDCP sequence number of the data packet from the first session is equal to the QFI sequence number of the data packet, or, the data
  • the difference between the PDCP sequence number of the packet and the QFI sequence number of the data packet is a fixed value.
  • the first mapping relationship is that all QoS flows of the first session are mapped to the same radio bearer, the PDCP sequence number of the data packet from the first session is equal to the GTP-U sequence number of the data packet, or, the PDCP sequence number of the data packet is equal to the The difference between the GTP-U sequence numbers of the data packets is a fixed value.
  • the first mapping relationship is a one-to-one mapping between the QoS flow of the first session and the radio bearer, and the maximum length of the PDCP sequence number of the data packet from the first session is less than the QFI sequence number of the data packet.
  • Setting the PDCP sequence number of the data packet through the above method can ensure that the PDCP sequence number set according to the QFI sequence number does not exceed the maximum value of the PDCP sequence number; or, ensure that the PDCP sequence number set according to the GTP-U sequence number does not exceed the PDCP sequence number. the maximum value of .
  • the first access network device determining the mapping relationship between the QoS flow of the first session and the radio bearer as the first mapping relationship according to the first indication information specifically includes: the first indication information indicates the first mapping relationship.
  • the foregoing first indication information is explicit indication information
  • the first indication information may include a first mapping relationship.
  • the first indication information may be an index
  • the index indicates the first mapping relationship
  • the first access network device determines the first mapping relationship according to the index
  • the corresponding relationship between the index and the first mapping relationship may be pre-configured by the core network device Or predefined in the protocol.
  • the first access network device determining the mapping relationship between the QoS flow of the first session and the radio bearer as the first mapping relationship according to the first indication information specifically includes: the first access network device according to the first indication information to determine whether the data packet from the first session satisfies the preset condition, and if the data packet satisfies the preset condition, the first access network device determines, according to the first indication information, that the mapping relationship between the QoS flow of the first session and the radio bearer is the first A mapping relationship, the first indication information includes a QoS identifier or a QoS parameter value.
  • the first access network device determines that the data packet from the first session meets the preset condition according to the first indication information, it means that the service to which the data packet of the first session belongs needs to be guaranteed when the access network device switches. Lossless transmission or high reliability transmission, in other words, for this service, different access network devices need to set the same PDCP sequence number for the same data packet of the service;
  • the mapping relationship establishes the mapping of QoS flows to radio bearers.
  • the first access network device determines the QoS flow of the first session according to the first indication information.
  • the mapping relationship to the radio bearer is the first mapping relationship.
  • One way is that the first indication information includes the first mapping relationship, and the first access network device can obtain the first mapping relationship from the first indication information.
  • a mapping relationship is pre-defined in the protocol or pre-configured by the core network device to the access network device.
  • the first indication information includes a QoS identifier or a QoS parameter value
  • the QoS identifier or QoS parameter value may be carried in the first session establishment request message.
  • the above-mentioned preset condition may be that the QoS identifier satisfies a certain condition or the QoS parameter value satisfies a certain condition, optionally, the preset condition may be configured to the base station through the core network device or a pre-defined protocol middle.
  • the above-mentioned QoS identifier includes 5QI; the QoS parameter value includes at least one of the following priority, packet delay budget or packet error rate.
  • the above-mentioned preset condition can be that the 5QI of the data packet is equal to the preset value; taking the QoS parameter value as the priority as an example, the above-mentioned preset condition can be that the priority is greater than or equal to the preset priority; Taking the QoS parameter value as the packet error rate as an example, the above preset condition may also be that the packet error rate of the data packet is lower than the preset threshold value.
  • the size relationship in the preset conditions here is only an example and is not strictly limited.
  • the preset condition is that a certain QoS parameter is greater than, less than, equal to, greater than or equal to, or less than or equal to.
  • the protection scope of this embodiment is only an example and is not strictly limited.
  • the preset condition is that a certain QoS parameter is greater than, less than, equal to, greater than or equal to, or less than or equal to.
  • the data transmission method provided by the embodiment of the present application further includes: the first access network device receives second indication information from the core network device, where the second indication information is used to indicate data from the first session
  • the business to which the package belongs is a local business.
  • the second indication information may include a service identifier, such as a service identifier of an MBS service; in addition, optionally, the second indication information may include local service indication information, and the local service indication information may indicate whether the service is a local service,
  • the second indication information may also be other indication information, which is not limited in this embodiment of the present application.
  • the second indication information may also include local area information of the local service, for example, may include a cell identifier (list), a tracking area identifier (list), or a base station identifier ( list), etc.
  • the above-mentioned second indication information is further used to indicate the local area to which the first access network device belongs.
  • the above-mentioned indication information sent to the first access network device to indicate whether the service to which the data packet from the first session belongs is a local service may also be the same as the indication information used to indicate the local area to which the first access network device belongs.
  • Different indication information that is, whether the service to which the data packet from the first session belongs is a local service through two independent indication information, and the indication information indicating the local area to which the first access network device belongs is different indication information.
  • the data transmission method provided by the embodiment of the present application further includes: when the user equipment switches from the first access network device to the second access network device, the first access network device sends the second access network device to the second access network device.
  • the network access device sends third indication information, where the third indication information is used to indicate that the service to which the data packet from the first session belongs is a local service.
  • the above-mentioned third indication information is further used to indicate the local area to which the first access network device belongs.
  • the second access network device determines, according to the third indication information, that the service to which the data packet from the first session belongs is a local service, and the local area to which the first access network device belongs is different from the second access network device.
  • the local areas to which they belong are different local areas (that is, the first access network device and the second access network device do not belong to the same local area of the same service), and the second access network device can determine that the service is a service that crosses local areas , so there is no need to ensure the continuity of the service during the user equipment handover process, that is, there is no need to ensure that no packets are lost, so the above data forwarding process does not need to be performed, and the second access network device does not need to allocate the first access network device.
  • data forwarding forwarding tunnel information, and the second access network device does not need to configure the PDCP status report in the handover request confirmation message, the user equipment does not need to send the PDCP status report to the second access network device after receiving the handover command. .
  • the indication information indicates whether the service to which the data packet belongs is a local service or a non-local service, and indicates the local area of the access network device, for the non-local service and the local service in the same local area, the switching of the user equipment is ensured Continuity of services in the process; for local services in different areas, there is no need to ensure the continuity of services in the switching process of user equipment, which can reduce the implementation complexity of access network equipment and user equipment.
  • an embodiment of the present application provides a data transmission method, including: a core network device generating first indication information, where the first indication information is used to indicate a mapping relationship between a QoS flow of a first session and a radio bearer; and the core network The device sends the first indication information to the first access network device. Because the core network device can indicate the mapping relationship between the QoS flow of the session and the radio bearer to the access network device, so that the access device transmits data according to the indicated mapping relationship, so that in the process of UE handover, the data in the process of user equipment handover can be reduced. packet loss, thereby providing better communication services for user equipment.
  • the mapping relationship between the QoS flow of the first session and the radio bearer is a first mapping relationship
  • the first mapping relationship is a one-to-one mapping between the QoS flow of the first session and the radio bearer, or the first session. All QoS flows are mapped to the same radio bearer.
  • the above-mentioned first indication information includes a QoS identifier or a QoS parameter value.
  • the QoS identifier includes 5QI; the QoS parameter value includes at least one of the following: priority, packet delay budget, or packet error rate.
  • the data transmission method provided by the embodiment of the present application further includes: the core network device obtains the data packet from the data server; and the core network device sets the GTP-U sequence number and/or the QFI sequence number of the data packet; and the core network device sends a data packet to the first access network device through the first session.
  • the core network device uniformly sets the GTP-U sequence number of the data packet for the data packet transmitted through the first session, and the GTP-U SN of the data packet belonging to the first session increases sequentially.
  • the core network device uniformly sets the QFI sequence numbers of the data packets in each QoS flow according to the QoS flow to which the data packets belong.
  • the QFI SNs of the data packets in different QoS flows are set independently. In a QoS flow, the QFI SNs of the packets belonging to the QoS flow are sequentially incremented.
  • the service to which the data packet from the first session belongs is a local service
  • the first access network device and the second access network device belong to the same local area of the same service
  • the core network device reports to the first access network device.
  • the core network device determines whether the service needs to ensure lossless transmission or high-reliability transmission during the movement of the UE according to the quality of service (QoS) requirement of the service to which the acquired data packet belongs.
  • QoS quality of service
  • the core network device sets the same GTP-U sequence number for the same data packet, and/or The same packet sets the same QFI sequence number. That is to say, for the same service (for example, the same TMGI service), when the core network device sends the same data packet to different access network devices, the GTP-U sequence number of the same data packet is the same, and/or the same The QFI sequence numbers of the packets are the same.
  • the data transmission method provided by the embodiment of the present application further includes: the core network device sends second indication information to the first access network device, where the second indication information is used to indicate data from the first session Whether the business to which the package belongs is a local business.
  • the above-mentioned second indication information is further used to indicate the local area to which the first access network device belongs.
  • the core network device sends the same data to different access network devices
  • the core network device When packetizing, set the GTP-U sequence number and/or the QFI sequence number of the data packet, so that the GTP-U sequence number of the same data packet is the same, and/or the QFI sequence number of the same data packet is the same.
  • the service to which the data packet acquired by the core network device belongs is a local service, and different access network devices do not belong to the same local area of the same service, when the core network device sends the same data packet to different access network devices, there is no need to It is restricted that identical data packets have the same GTP-U sequence number, and/or identical data packets have the same QFI sequence number.
  • the GTP-U sequence numbers of the same data packets may be the same or different, and/or the QFI sequence numbers of the same data packets may be the same or different.
  • an embodiment of the present application provides a first access network device, including a receiving module, a determining module, and a sending module.
  • the receiving module is used for receiving the first indication information;
  • the determining module is used for determining the mapping relationship between the QoS flow of the first session and the radio bearer according to the first indication information as the first mapping relationship;
  • the sending module is used for transmitting according to the first mapping relationship packets from the first session.
  • the above-mentioned first mapping relationship is a one-to-one mapping between the QoS flow of the first session and the radio bearer, or the mapping of all QoS flows of the first session and the same radio bearer.
  • the first access network device further includes a processing module, and the processing module is configured to, in the case that the first mapping relationship is a one-to-one mapping between the QoS flow of the first session and the radio bearer, according to the data packet
  • the QFI serial number sets the PDCP serial number of the data packet; the sending module is used to send the data packet.
  • the processing module is further configured to set the PDCP sequence number of the data according to the GTP-U sequence number of the data packet when the first mapping relationship is that all QoS flows of the first session are mapped to the same radio bearer; the sending module is used to send the data packet .
  • the above-mentioned first mapping relationship is a one-to-one mapping between the QoS flow of the first session and the radio bearer, and the PDCP sequence number of the data packet from the first session is equal to the QFI sequence number of the data packet, or, the data
  • the difference between the PDCP sequence number of the packet and the QFI sequence number of the data packet is a fixed value.
  • the first mapping relationship is that all QoS flows of the first session are mapped to the same radio bearer, the PDCP sequence number of the data packet from the first session is equal to the GTP-U sequence number of the data packet, or, the PDCP sequence number of the data packet is equal to the The difference between the GTP-U sequence numbers of the data packets is a fixed value.
  • the first mapping relationship is a one-to-one mapping between the QoS flow of the first session and the radio bearer, and the maximum length of the PDCP sequence number of the data packet from the first session is less than the QFI sequence number of the data packet.
  • the first access network device determines that the mapping relationship between the QoS flow of the first session and the radio bearer is the first mapping relationship according to the first indication information.
  • the first mapping relationship includes: the first indication information indicates the first mapping relationship. .
  • the first access network device determines that the mapping relationship between the QoS flow of the first session and the radio bearer is the first mapping relationship according to the first indication information.
  • the first mapping relationship includes: the first access network device according to the first The indication information determines whether the data packet satisfies the preset condition. If the data packet satisfies the preset condition, the first access network device determines, according to the first indication information, that the mapping relationship between the QoS flow of the first session and the radio bearer is the first mapping relationship.
  • the first indication information includes a QoS identifier or a QoS parameter value.
  • the above-mentioned QoS identifier includes 5G service quality identifier 5QI; the above-mentioned QoS parameter value includes at least one of the following priority, packet delay budget or packet error rate.
  • the receiving module is further configured to receive second indication information from the core network device, where the second indication information is used to indicate that the service to which the data packet from the first session belongs is a local service.
  • the above-mentioned second indication information is further used to indicate the local area to which the first access network device belongs.
  • the above-mentioned sending module is further configured to send third indication information to the second access network device when the user equipment is switched from the first access network device to the second access network device, the The third indication information is used to indicate that the service to which the data packet from the first session belongs is a local service.
  • the above-mentioned third indication information is further used to indicate the local area to which the first access network device belongs.
  • an embodiment of the present application provides a core network device, which includes a generating module and a sending module.
  • the generating module is configured to generate first indication information, where the first indication information is used to indicate the mapping relationship between the QoS flow of the first session and the radio bearer; the sending module is used to send the first indication information to the first access network device.
  • the mapping relationship between the QoS flow of the first session and the radio bearer is a first mapping relationship
  • the first mapping relationship is a one-to-one mapping between the QoS flow of the first session and the radio bearer, or the first session. All QoS flows are mapped to the same radio bearer.
  • the above-mentioned first indication information includes a QoS identifier or a QoS parameter value.
  • the QoS identifier includes 5QI; the QoS parameter value includes at least one of the following: priority, packet delay budget, or packet error rate.
  • the core network device further includes an acquisition module and a processing module.
  • the acquisition module is used to acquire the data packet from the data server;
  • the processing module is used to set the GTP-U serial number and/or the QFI serial number of the data packet;
  • the above-mentioned sending module is also used to send the first access network device through the first session Send packets.
  • the service to which the data packet from the first session belongs is a local service
  • the first access network device and the second access network device belong to the same local area of the same service
  • the core network device reports to the first access network device.
  • the above-mentioned sending module is further configured to send second indication information to the first access network device, where the second indication information is used to indicate whether the service to which the data packet from the first session belongs is a local service.
  • the above-mentioned second indication information is further used to indicate the local area to which the first access network device belongs.
  • an embodiment of the present application provides a first access network device, including a processor and a memory coupled to the processor; the memory is used to store computer instructions, and when the first access network device runs, the processor executes The computer instructions stored in the memory enable the first access network device to perform the method described in any one of the above-mentioned first aspect and its possible implementation manners.
  • an embodiment of the present application provides a computer-readable storage medium, where the computer-readable storage medium includes a computer program, when the computer program runs on a computer, to execute any of the above-mentioned first aspect and its possible implementation manners. one of the methods described.
  • embodiments of the present application provide a computer program product containing instructions, which, when run on a computer, cause the computer to execute the method described in any one of the first aspect and its possible implementation manners.
  • an embodiment of the present application provides a chip, including a memory and a processor.
  • Memory is used to store computer instructions.
  • the processor is adapted to invoke and execute the computer instructions from the memory to perform the method described in any one of the first aspect and its possible implementations.
  • an embodiment of the present application provides a core network device, including a processor and a memory coupled to the processor; the memory is used to store computer instructions, and when the core network device runs, the processor executes the computer instructions stored in the memory, So that the core network device executes the method described in any one of the foregoing second aspect and its possible implementation manners.
  • an embodiment of the present application provides a computer-readable storage medium, where the computer-readable storage medium includes a computer program, when the computer program runs on a computer, to execute any of the above-mentioned second aspect and its possible implementation manners. one of the methods described.
  • the embodiments of the present application provide a computer program product containing instructions, which, when run on a computer, cause the computer to execute the method described in any one of the second aspect and its possible implementation manners.
  • an embodiment of the present application provides a chip, including a memory and a processor.
  • Memory is used to store computer instructions.
  • the processor is adapted to invoke and execute the computer instructions from the memory to perform the method of any one of the second aspect and its possible implementations.
  • an embodiment of the present application provides a communication system, including the first access network device described in the third aspect or the first access network device described in the fifth aspect, and the core described in the fourth aspect.
  • FIG. 1 is a schematic diagram of a transmission process of an MBS service provided by an embodiment of the present application
  • FIG. 2 is a schematic diagram of a local MBS service provided by an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of a user plane protocol stack provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a method for a UE handover process provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of handover of a UE according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a mapping relationship of an MBS session provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of an application scenario of a data transmission method provided by an embodiment of the present application.
  • FIG. 8 is a schematic diagram of hardware of a base station according to an embodiment of the present application.
  • FIG. 9 is a schematic diagram 1 of a data transmission method provided by an embodiment of the present application.
  • FIG. 10 is a second schematic diagram of a data transmission method provided by an embodiment of the present application.
  • FIG. 11 is a schematic diagram 1 of setting a PDCP sequence number of a data packet according to an embodiment of the application;
  • FIG. 12 is a schematic diagram 2 of setting a PDCP sequence number of a data packet according to an embodiment of the present application
  • FIG. 13 is a schematic diagram 3 of a data transmission method according to an embodiment of the present application.
  • FIG. 14 is a schematic structural diagram 1 of a first access network device according to an embodiment of the present application.
  • FIG. 15 is a second schematic structural diagram of a first access network device according to an embodiment of the present application.
  • FIG. 16 is a schematic structural diagram 1 of a core network device according to an embodiment of the present application.
  • FIG. 17 is a second schematic structural diagram of a core network device according to an embodiment of the present application.
  • first and second in the description and claims of the embodiments of the present application are used to distinguish different objects, rather than to describe a specific order of the objects.
  • first access network device and the second access network device are used to distinguish different access network devices, but not used to describe the specific order of the access network devices;
  • the third indication information and the like are suitable for distinguishing different indication information, rather than for describing a specific order of the indication information.
  • words such as “exemplary” or “for example” are used to represent examples, illustrations or illustrations. Any embodiments or designs described in the embodiments of the present application as “exemplary” or “such as” should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as “exemplary” or “such as” is intended to present the related concepts in a specific manner.
  • multiple processing units refers to two or more processing units; multiple systems refers to two or more systems.
  • Multicast Broadcast Service It is a service for multiple UEs.
  • Common MBS services include live broadcast services, public safety services, and batch software update services.
  • the data transmission process of the MBS service specifically includes: the core network equipment obtains the MBS service data from the MBS server (referring to the server that generates the MBS service data), and then the core network equipment communicates with the access network equipment (such as a base station) through the core network equipment.
  • the MBS session established between them sends MBS service data to the access network device, and then the access network device sends the same MBS service data to multiple UEs.
  • the MBS service data transmission mode (that is, the mode in which the access network device sends the MBS service data to multiple UEs) may be a point-to-multipoint (point to multi-point, PTM) transmission mode or a point-to-point (point-to-point) transmission mode. to point, PTP) transmission method.
  • PTM point to multi-point
  • PTP point-to-point
  • MBS services can be divided into local MBS services and non-local MBS services.
  • non-local services refer to the same content of MBS services in all areas; local MBS services refer to services that are valid in a certain local area.
  • the content of the MBS service in different areas may be different, and the service data of the MBS service in different areas may be provided by different MBS servers.
  • some V2X services and public safety services are local MBS services.
  • the service identifier of the MBS service may be a temporary multicast group identifier (TMGI).
  • the contents broadcast in the local area 1 and the local area 2 are different, that is, for the local V2X service of the same service identifier, the local area
  • the content corresponding to the V2X service of 1 is different from the content corresponding to the V2X service of local area 2 (content 2 in FIG. 2 ).
  • the content of the MBS service received by the vehicle is content 2;
  • the vehicle can receive both content 1 and content 2; when the vehicle travels to local area 1 and exits local area 2, the vehicle The content of the received MBS service is content 1.
  • Protocol stack on the radio access network side The UE on the radio access network side and the access network equipment have a protocol stack, and the UE communicates with the access network equipment based on the protocol stack.
  • the protocol stack includes the protocol stack of the control plane and the protocol stack of the user plane. .
  • the structure of the protocol stack of the UE and the access network equipment includes a radio resource control (RRC) layer, a service data adaptation (service data adaptation protocol, SDAP) layer, and a packet data convergence protocol.
  • RRC radio resource control
  • SDAP service data adaptation protocol
  • PDCP packet data convergence protocol
  • RLC radio link control
  • PHY layer physical layer
  • the physical layer is located at the bottom layer and belongs to layer 1; SDAP layer, PDCP layer, RLC layer and MAC layer belong to the second layer (layer 2); RRC layer is input to the third layer (layer 3).
  • FIG. 3 is a schematic structural diagram of a user plane protocol stack. It should be noted that FIG. 3 only illustrates the structures of layer 2 and layer 1 of the user plane protocol stack, and layer 3 is not illustrated.
  • the transmission direction indicated by the arrow in FIG. 3 is the data transmission direction of the MBS service, that is, a schematic diagram of the process of the access network device sending data to the UE.
  • the data arrives at the SDAP layer of the access network device, and after completing the mapping of the QoS flow of the service to the wireless bearer through the SDAP layer, the data is transmitted to the PDCP layer and processed by the PDCP layer (for example, including Header compression, encryption, integrity protection, etc.) and then transmitted to the RLC layer and the MAC layer in turn, and the corresponding processing is performed at the RLC layer and the MAC layer, and then the data is sent from the physical layer (PHY layer) and transmitted to the UE through the air interface. Then, each protocol layer of the UE performs corresponding processing on the data in turn according to the processing sequence opposite to that of the access network device.
  • the PDCP layer for example, including Header compression, encryption, integrity protection, etc.
  • each protocol layer of the access network device and the UE corresponds to functional entities, and each protocol layer corresponds to one or more functional entities.
  • the functions of each protocol layer are implemented by the functional entities corresponding to each protocol layer.
  • the functional entity corresponding to the PDCP layer is the PDCP entity.
  • Radio bearer When an access network device communicates with a UE, a radio bearer needs to be established, and then messages or data are transmitted based on the radio bearer.
  • the above-mentioned access network equipment and the processing of data packets by various protocol layers of the UE can be called radio bearers.
  • the division of radio bearers is based on PDCP entities. It includes one PDCP entity, for example, if the PDCP layer establishes two PDCP entities, it corresponds to two radio bearers.
  • a radio bearer may include at least one RLC entity, and one RLC entity corresponds to one logical channel.
  • Handover refers to the process of communicating between the UE and the access network equipment (such as a base station), due to the movement of the UE, the source base station can no longer provide the UE with services that meet the needs of the UE, and the UE needs to disconnect from the source.
  • the base station is connected, and then the connection with the target base station is established. Subsequently, the target base station provides services for the UE. This process is called the UE needing to switch from the source base station to the target base station.
  • the process of handover of the UE from the source base station to the target base station includes steps 401 to 409 .
  • Step 401 The source base station sends an RRC reconfiguration message (RRCReconfigration) to the UE in the connected state.
  • RRCReconfigration RRC reconfiguration message
  • the RRC reconfiguration message includes information such as measurement objects, measurement report configuration information, and measurement identifiers.
  • Step 402 The UE performs RRC measurement on multiple cells according to the RRC reconfiguration message, generates a measurement report (Measure Report), and sends the measurement report to the source base station.
  • the measurement report includes indicator data such as signal strength and signal received power.
  • Step 403 The source base station determines whether the UE needs to be handed over according to the measurement report reported by the UE (Handover Decision).
  • Step 404 When the source base station determines that the UE needs to be handed over, the source base station sends a handover request message (Handover Request) to the target base station.
  • Handover Request a handover request message
  • Step 405 The target base station determines whether to allow the UE to access (Admission Control).
  • the target base station may determine whether to allow the UE to access according to the number of connections of the target base station, for example, when the number of connections of the target base station is small, the target base station allows the UE to access; if the number of connections of the target base station is large, the If the target base station can no longer provide services for the UE, the target base station does not allow the UE to access.
  • Step 406 When the target base station determines that the UE is allowed to access, the target base station sends a handover acknowledgement message (Handover Request ACK) to the source base station.
  • Handover Request ACK a handover acknowledgement message
  • the handover confirmation message includes information of the target cell to be accessed by the UE and some configuration parameters required by the UE to access the target cell.
  • the information of the target cell includes the physical cell identifier (PCI) of the target cell, and the frequency information corresponding to the target cell, such as the corresponding frequency point of the target cell.
  • PCI physical cell identifier
  • the content of the frequency information of the cell can refer to The specific description of FrequencyInfoDL IE in protocol TS38331.
  • the configuration parameters required by the UE to access the target cell may further include RACH resource information (eg, dedicated RACH resources and/or RACH resources) required by the UE to access the target cell.
  • Step 407 The source base station sends a handover command to the UE.
  • the handover command may be sent through an RRC reconfiguration message, and the handover command includes the information of the target cell and some configuration parameters required by the UE to access the target cell.
  • Step 408 The UE initiates random access (Random Access) to the target base station according to the handover instruction.
  • Step 409 The UE sends an RRC reconfiguration complete message (RRRCeconifiguration Complete) to the target base station.
  • the UE will disconnect from the source base station, and there may be a brief interruption in the transmission and reception of data by the UE before the UE successfully accesses the target base station.
  • UE handover may also occur during the above-mentioned MBS service data transmission process.
  • UE2 in FIG. 5 is handed over from the first access network device to the second access network device due to the location movement, and UE2 is handed over to the second access network device.
  • the second access network device After accessing the network device, the second access network device sends the data of the MBS service to UE2.
  • the core network device sends the MBS service data packet to the access network device through the MBS session.
  • one MBS session corresponds to one transmission channel (such as a GTP-U tunnel or N3 interface)
  • one MBS session or one transmission channel contains one or more quality of service (quality of service, QoS) flows, namely QoS flow
  • QoS flow of the MBS session may also be called MBS flow or other names, which are not limited in this embodiment of the present application.
  • a radio bearer corresponds to a Packet Data Convergence Protocol (PDCP) entity.
  • PDCP Packet Data Convergence Protocol
  • the core network equipment After the core network equipment obtains the data packets of the MBS service, the core network equipment adds the core network serial number to each data packet, such as the general packet radio service tunneling protocol-user plane serial number (GPRS tunneling protocol-U serial number, GTP-U SN), and QoS flow identification serial number (QFI SN) can also be added to each data packet, and the core network device can set GTP-US SN and/or QFI SN for each data packet.
  • the setting rule of GTP-USN is: perform unified setting in an MBS session, that is, in an MBS session, the GTP-USN of the data packets belonging to the MBS session increases sequentially, and the setting of GTP-USN is the same as that of GTP-USN.
  • the QoS flows contained in the MBS session are irrelevant, that is, the GTP-USN does not distinguish QoS flows.
  • the setting rule of QFI SN is: uniformly set in one QoS flow, and the QFI SNs of data packets in different QoS flows are set independently, that is, in a QoS flow, the QFI SNs of data packets belonging to this QoS flow are set in sequence Incrementally, the QFI SN settings of different QoS flow packets do not affect each other.
  • the MBS session includes 3 QoS flows, which are respectively denoted as QoS flow A, QoS flow B, and QoS flow C, for the continuous 6 data in the MBS session.
  • the packets are recorded as data packet 1, data packet 2, data packet 3, data packet 4, data packet 5 and data packet 6.
  • the GTP-U of these 6 data packets The SN can be: 1, 2, 3, 4, 5, 6 in sequence.
  • data packets 1 and 4 belong to QoS flow A
  • data packets 2 and 5 belong to QoS flow B
  • data packets 3 and 6 belong to QoS flow C.
  • QFI SNs of packet 1 and packet 4 in QoS flow B are 1 and 2 in turn; the QFI SNs of packet 2 and packet 5 in QoS flow B are 1 and 2 in turn; packet 3 and packet 6 in QoS flow C
  • the QFI SNs are 1 and 2 in order.
  • the core network equipment sets the GTP-US SN and/or QFI SN for the received data packets, it sends the data packets to the access network equipment, the access network equipment receives the data packets, and establishes the QoS of the MBS session
  • the mapping of flow to radio bearer means that the data packets of the QoS flow need to be transmitted through the mapped radio bearer.
  • the radio bearer corresponds to PDCP one-to-one, so PDCP is used to refer to the radio bearer.
  • the access network device After the access network device removes the packet header containing the GTP-US SN and/or the QFI SN, the data packet is transmitted to the PDCP entity, and the PDCP entity of the access network device sets the PDCP SN for the data packet, and then based on the corresponding radio bearer
  • the data packets are sent to the user equipment after being processed by various protocol layer entities. Specifically, the access network device transmits the data packets of the corresponding QoS flow through the wireless bearer according to the mapping relationship between the QoS flow of the MBS session and the wireless bearer.
  • the mapping relationship between the QoS flow of the MBS session and the radio bearer may include but is not limited to: one-to-one mapping between the QoS flow of the MBS session and the radio bearer, that is, one QoS flow corresponds to one radio bearer, and one radio bearer corresponds to one QoS.
  • the access network device may set the PDCP SN of the data packet according to the GTP-US SN of the data packet or the QFI SN of the data packet.
  • the three QoS flows included in the MBS session are mapped to the radio bearer as follows: QoS flow A and QoS flow C are mapped to the radio bearer A (which can be denoted as PDCP A, referring to the PDCP entity A); QoS flow B is mapped to wireless bearer B (denoted as PDCP B), then the data packets of QoS flow A and QoS flow C are transmitted through wireless bearer A, and PDCP A is the data of QoS flow A and QoS flow C Add PDCP SN to the packet; the data packet of QoS flow B is transmitted through wireless bearer B, and PDCP B adds PDCP SN to the data packet of QoS flow B.
  • the PDCP SN of the data packet is set according to the GTP-US SN, and the PDCP SN of the data packet is equal to the GTP-US SN
  • the PDCP SN of the data packet of the MBS session refers to Figure 6 for details.
  • the data packet may be lost during the handover process.
  • the transmission progress of the data packets of the same MBS service by different access network devices may be different, and Different access network devices independently set the mapping relationship between QoS flows and radio bearers. For example, for MBS services with the same service identifier, the mapping relationship between QoS flows and radio bearers of MBS sessions established by different access network devices may be different.
  • the PDCP SNs set by the same access network device for the same data packet will also be different. Therefore, during the handover process of the UE, the two access network devices cannot know the status of the data packet actually transmitted by the other party, which may lead to the UE in the process of handover. Packet loss occurs in .
  • the phenomenon of data packet loss during UE handover is not limited to MBS services, and the problem of packet loss may also exist in unicast services.
  • the embodiments of the present application provide a data transmission method and apparatus.
  • the core network device can send first indication information to the first access network device, and then the first access network device receives the first indication information. Then, according to the first indication information, it is determined that the mapping relationship between the QoS flow of the current session (referred to as the first session) and the radio bearer is the first mapping relationship, and then the first access network device transmits the data from the first session according to the first mapping relationship. data pack.
  • the access network device in the communication system transmits data packets according to the data transmission method provided in the embodiments of the present application, which can reduce the loss of data packets during the handover process of the user equipment, thereby providing better communication services for the user equipment.
  • the data transmission method provided in this embodiment of the present application can be applied to a scenario in which one entity in a communication system sends information to another entity, and another entity receives information, and the method can be applied to a scenario in which an access network device communicates with a user equipment , that is, a unicast service scenario; the method can also be used in a scenario where an access network device communicates with multiple user equipments, that is, a multicast broadcast (MBS) service scenario.
  • MBS multicast broadcast
  • the method can be applied to a 5G NR system, and can also be applied to other communication systems.
  • the access network device may be a base station, and the user equipment may be a UE.
  • FIG. 7 shows an application scenario provided by an embodiment of the present application.
  • the communication system includes a base station and 6 UEs, which are denoted as UE1 to UE6 respectively.
  • UE6 sends downlink data
  • UE1 to UE6 can send uplink data to the base station.
  • UE4, UE5 and UE6 in the communication system can form a communication system
  • the base station sends downlink data to UE1, UE2, UE3 and UE5, and then UE5 sends downlink information to UE4 and UE6, and UE4 and UE6 can also pass UE5. Send uplink information to the base station.
  • the access network device in the embodiment of the present application may be a base station, and the base station may be a commonly used base station, an evolved base station (evolved node base station). , eNB), next generation node base station (gNB), new radio base station (new radio eNB), macro base station, micro base station, high frequency base station or transmission and reception point in 5G system, TRP)) and other equipment.
  • eNB evolved base station
  • gNB next generation node base station
  • new radio base station new radio base station
  • TRP transmission and reception point in 5G system
  • the embodiments of the present application take a commonly used base station as an example to introduce the hardware structure of the network device.
  • Each component of the base station provided in the embodiment of the present application is described in detail below with reference to FIG. 8 . As shown in FIG.
  • the base station provided in this embodiment of the present application may include: part 80 and part 81 .
  • Part 80 is mainly used for receiving and sending radio frequency signals and conversion between radio frequency signals and baseband signals;
  • part 81 is mainly used for baseband processing and controlling the base station.
  • the 80 part can generally be referred to as a transceiver unit, a transceiver, a transceiver circuit, or a transceiver.
  • the 81 part is usually the control center of the base station, which can usually be called a processing unit.
  • the transceiver unit of part 80 which may also be called a transceiver, or a transceiver, etc., includes an antenna and a radio frequency unit, or only includes a radio frequency unit or a part thereof, wherein the radio frequency unit is mainly used for radio frequency processing.
  • the device used for implementing the receiving function in part 80 may be regarded as a receiving unit, and the device used for implementing the transmitting function may be regarded as a sending unit, that is, part 80 includes a receiving unit and a sending unit.
  • the receiving unit may also be referred to as a receiver, a receiver, or a receiving circuit, and the like, and the transmitting unit may be referred to as a transmitter, a transmitter, or a transmitting circuit, and the like.
  • Part 81 may include one or more single boards or chips, each single board or chip may include one or more processors and one or more memories, the processor is used to read and execute programs in the memory to implement baseband processing functions and control of the base station. If there are multiple boards, each board can be interconnected to increase processing capacity. As an optional implementation manner, multiple boards may share one or more processors, or multiple boards may share one or more memories. Wherein, the memory and the processor can be integrated together, or can be set independently. In some embodiments, part 80 and part 81 may be integrated together, or may be provided independently. In addition, all functions in part 81 may be integrated in one chip for implementation, or part of functions may be integrated in one chip for implementation, and another part of functions may be integrated in one or more other chips for implementation, which is not limited in this embodiment of the present application.
  • the core network device in the embodiment of the present application may be a related network function (network function, NF) in the 5G NR system, such as an access and mobility management function (AMF), a session management function (session management function) , SMF) and user plane function (user plane function, UPF) and so on.
  • network function network function, NF
  • AMF access and mobility management function
  • SMF session management function
  • UPF user plane function
  • UPF is mainly responsible for the related processing of user plane data packets, which can be used to obtain data packets from the data network (data server), set the core network serial number for the data packets, and then send the data packets to the access network equipment;
  • AMF mainly responsible for the related processing of data plane signaling, for example, it can be used to generate indication information, etc., and send indication information (such as the first indication information and the second indication information in the following embodiments) to the access network device;
  • SMF is mainly responsible for converting Some packet handling policies are sent to UPF etc.
  • the core network device may also be a network element or network function having the above-mentioned functions in other communication systems such as 4G, which is specifically determined according to the actual situation, and is not limited in the embodiment of the present application.
  • the data transmission method provided by the embodiments of the present application can be used to transmit MBS services, and can also be used to transmit unicast services, which are not limited in the embodiments of the present application.
  • the data transmission method provided by the embodiment of the present application is described in detail by taking the MBS service as an example.
  • the data transmission method provided by this embodiment of the present application includes steps 901 to 908 .
  • Step 901 the core network device obtains the data packet from the data server.
  • the data packet obtained by the core network device from the data server or the content server is a data packet of a certain service
  • the core network device may obtain the data packet directly or indirectly from the data server or the content server, for example, the data packet from The data server or content server is sent to the core network device through a gateway or other forwarding device.
  • the core network device After the core network device acquires the data packet of the service, the core network device sends the data packet to the access network device through a transmission channel or a communication interface between the core network device and the access network device.
  • one transmission channel or communication interface corresponds to one session, which is referred to as the first session in the following embodiments, and the first session is the data established between the core network device and the first access network device for transmitting a certain service. session, the first session may contain one or more QoS flows.
  • the first session is an MBS session
  • the QoS flow included in the MBS session may be called an MBS flow (ie, an MBS flow).
  • Step 902 the core network device sets the GTP-U sequence number and/or the QFI sequence number of the data packet.
  • the core network equipment uniformly sets the data packets transmitted through the first session
  • the GTP-U sequence number of the data packet, the GTP-US SN of the data packet belonging to the first session is incremented sequentially.
  • the core network device uniformly sets the QFI sequence numbers of the data packets in each QoS flow according to the QoS flow to which the data packets belong.
  • the QFI SNs of the data packets in different QoS flows are set independently.
  • a new SN may also be designed for the MBS service, for example, an MBS SN, which is not limited in this embodiment of the present application.
  • the core network device determines whether the service needs to ensure lossless transmission or high-reliability transmission during the movement of the UE according to the quality of service (QoS) requirement of the service to which the acquired data packet belongs.
  • QoS quality of service
  • the core network device sets the same GTP-U sequence number for the same data packet, and/or The same packet sets the same QFI sequence number. That is to say, for the same service (for example, the same TMGI service), when the core network device sends the same data packet to different access network devices, the GTP-U sequence number of the same data packet is the same, and/or the same The QFI sequence numbers of the packets are the same.
  • the GTP-U sequence number of the first data packet sent by the core network device to the first access network device through the first session is the same as the GTP-U sequence number of the first data packet sent by the core network device to the second access network device through the second session.
  • the GTP-U sequence number is the same, and/or the QFI sequence number of the first data packet sent by the core network device to the first access network device through the QoS flow of the first session is the same as the QFI sequence number of the first data packet sent by the core network device to the second access network device through the QoS flow of the second session.
  • the QFI sequence numbers of the first data packet sent by the network access device are the same.
  • the same data packet in the embodiment of the present application refers to the data packets with the same content and the same size of the data packets, and the core network device duplicates a data packet into multiple data packets. can be called the same packet.
  • Step 903 The core network device sends a data packet to the first access network device through the first session.
  • Step 904 The core network device generates first indication information.
  • the first indication information is used to indicate the mapping relationship between the QoS flow of the first session and the radio bearer.
  • Step 905 The core network device sends the first indication information to the first access network device.
  • the core network device may send the first indication information to the first access network device through a first session establishment/modification request message or a QoS flow establishment/modification request message, or may send the first indication information to the first access network device through other messages.
  • Sending the first indication information is not limited in this embodiment of the present application.
  • Step 906 The first access network device receives the first indication information.
  • Step 907 The first access network device determines, according to the first indication information, the mapping relationship between the QoS flow of the first session and the radio bearer as the first mapping relationship.
  • the above-mentioned first mapping relationship is a one-to-one mapping between the QoS flow of the first session and the radio bearer, or the mapping of all QoS flows of the first session to the same radio bearer.
  • the first session includes 3 QoS flows, which are respectively denoted as QoS flow A, QoS flow B and QoS flow C.
  • Table 1 shows an example of one-to-one mapping between the QoS flow of the first session and the radio bearer.
  • Table 2 shows an example of mapping the QoS flow of the first session to the same radio bearer.
  • the first access network device determines that the mapping relationship between the QoS flow of the first session and the radio bearer is the first mapping relationship according to the first indication information.
  • the first mapping relationship includes: the first indication information indicates the first mapping relationship, In this way, when the first access network device receives the first indication information, the first access network device determines the first mapping relationship according to the indication of the first indication information.
  • the first indication information is explicit indication information, and the first indication information may include a first mapping relationship.
  • the first indication information may be an index, the index indicates the first mapping relationship, the first access network device determines the first mapping relationship according to the index, and the corresponding relationship between the index and the first mapping relationship may be pre-configured by the core network device Or predefined in the protocol.
  • the first access network device determining the mapping relationship between the QoS flow of the first session and the radio bearer as the first mapping relationship according to the first indication information specifically includes: the first access network device according to the first The indication information determines whether the data packet from the first session or the service to which it belongs satisfies the preset condition. If the data packet or the service to which it belongs meets the preset condition, the first access network device determines the first session according to the first indication information.
  • the mapping relationship between the QoS flow and the radio bearer is the first mapping relationship.
  • the first access network device determines that the data packet from the first session meets the preset condition according to the first indication information, it means that the service to which the data packet of the first session belongs needs to be guaranteed when the access network device switches. Lossless transmission or high reliability transmission, in other words, for this service, different access network devices need to set the same PDCP sequence number for the same data packet of the service;
  • the mapping relationship establishes the mapping of QoS flows to radio bearers.
  • the first access network device determines the QoS flow of the first session according to the first indication information.
  • the mapping relationship to the radio bearer is the first mapping relationship.
  • One way is that the first indication information includes the first mapping relationship, and the first access network device can obtain the first mapping relationship from the first indication information.
  • a mapping relationship is pre-defined in the protocol or pre-configured by the core network device to the access network device.
  • the first indication information includes a QoS identifier or a QoS parameter value
  • the QoS identifier or QoS parameter value may be carried in the first session establishment request message.
  • the QoS identifier may include a 5G quality of service identity (5G quality of service identity, 5QI); the QoS parameter value includes at least one of the following priorities, a packet delay budget, or a packet error rate.
  • the QoS parameter value may be the value of the above-mentioned existing QoS parameter, and the QoS parameter value may also be the value of a QoS parameter newly defined in this embodiment of the present application, which is specifically selected according to actual requirements, which is not limited here.
  • the above-mentioned preset condition may be that the QoS identifier satisfies a certain condition or the QoS parameter value satisfies a certain condition, optionally, the preset condition may be configured to the base station through the core network device or a pre-defined protocol middle.
  • the above-mentioned preset condition may be that the 5QI of the data packet is equal to the preset value, for example, the preset condition is that the 5QI of the data packet is equal to 73, and the first access network device receives the first indication information. After that, the first access network device obtains the 5QI of the data packet from the first indication information, and then the first access network device determines whether the 5QI carried in the first indication information is equal to 73, and the 5QI in the first indication information is equal to 73 In the case of , the first access network device determines the first mapping relationship according to the first indication information.
  • the above preset condition may be that the priority is greater than or equal to the preset priority.
  • the first access network device After the first access network device receives the first indication information, the first access network device starts from the first indication. The priority is obtained from the information, and then the first access network device determines whether the priority carried in the first indication information is greater than or equal to the preset priority, and the priority in the first indication information is greater than or equal to the preset priority. Next, the first access network device determines the first mapping relationship according to the first indication information.
  • the above preset condition may also be that the packet error rate of the data packet is lower than the preset threshold value, and after the first access network device receives the first indication information, the first The access network device obtains the packet error rate from the first indication information, and then the first access network device determines whether the packet error rate carried in the first indication information is lower than a preset threshold, and the first indication information In the case that the packet error rate is lower than the preset threshold value, the first access network device determines the first mapping relationship according to the first indication information.
  • the size relationship in the preset conditions here is only an example and is not strictly limited.
  • the preset condition is that a certain QoS parameter is greater than, less than, equal to, greater than or equal to, or less than or equal to.
  • the protection scope of this embodiment is only an example and is not strictly limited.
  • the preset condition is that a certain QoS parameter is greater than, less than, equal to, greater than or equal to, or less than or equal to.
  • Step 908 The first access network device transmits the data packet from the first session according to the first mapping relationship.
  • the first access network device determines that the mapping relationship between the QoS flow of the first session and the radio bearer is the first mapping relationship, and the first access network device establishes the mapping between the QoS flow of the first session and the radio bearer, Then, the first access network device transmits the data packet from the first session according to the first mapping relationship.
  • step 908 specifically includes step 9081 or step 9082
  • Step 9081 The first mapping relationship is a one-to-one mapping between the QoS flow of the first session and the radio bearer.
  • the first access network device sets the PDCP sequence number of the data packet according to the QFI sequence number of the data packet, and sends the data packet.
  • the PDCP sequence number of the data packet from the first session is equal to the QFI sequence number of the data packet, or the difference between the PDCP sequence number of the data packet and the QFI sequence number of the data packet is a fixed value .
  • the fixed value may be pre-defined by a protocol or pre-configured by a core network device, or indicated by the first indication information.
  • A (B)mod(X)
  • FIG. 11 is a schematic diagram of setting the PDCP sequence number of the data packet from the first session when the QoS flow of the first session and the radio bearer are mapped one-to-one.
  • the QoS flow of the first session includes QoS flow A and QoS flow B. Taking 5 consecutive packets from the first session as an example, packet 1, packet 3 and packet 5 belong to QoS flow A. , Packet 2 and Packet 4 belong to QoS flow B.
  • the PDCP sequence number of the data packet is set according to the PDCP sequence number of the data packet equal to the QFI sequence number of the data packet. It can be seen that in the same QoS flow, the PDCP sequence numbers are consecutive and increase sequentially.
  • the QoS flow of the first session and the radio bearer are mapped one-to-one, and the first access network device sets the PDCP sequence number of the data packet according to the QFI sequence number of the data packet, and sends the data packet to the user equipment .
  • both the source access network device and the target access network device of the user equipment set the PDCP sequence number of the data packet according to this method.
  • the mapping relationship is also the same. Therefore, when the UE switches between different access network devices, the progress of data packet transmission by the access network device can be determined according to the PDCP sequence number, and the user equipment can be reduced by data forwarding technology or data buffering technology. Packet loss during handover.
  • the data forwarding technology refers to that in the process of UE handover, the first access network device sends the data packet from the first session to the second access network device, so that after the user equipment is successfully handed over, the The second access network device sends the data packets received from the first access network device to the user equipment, so as to reduce the loss of data packets during the handover process of the user equipment.
  • the data buffering technology refers to that during the user equipment handover process, the second access network device buffers the data packets it receives from the first session. The data packets are sent to the user equipment to reduce the loss of data packets during the handover of the user equipment.
  • Step 9082 The first mapping relationship is that all QoS flows of the first session are mapped to the same radio bearer, and the first access network device sets the PDCP sequence number of the data according to the GTP-U sequence number of the data packet, and sends the data packet.
  • the PDCP sequence number of the data packet from the first session is equal to the GTP-U sequence number of the data packet, or the difference between the PDCP sequence number of the data packet and the GTP-U sequence number of the data packet
  • the value is a fixed value.
  • the fixed value may be predefined by a protocol or preconfigured by a core network device, or indicated by the first indication information.
  • FIG. 12 is a schematic diagram showing the setting of PDCP sequence numbers of data packets from the first session when all QoS flows of the first session are mapped to the same radio bearer.
  • the QoS flow of the first session includes QoS flow A and QoS flow B. Taking five consecutive data packets from the first session as an example, data packet 1, data packet 3 and data packet 5 belong to QoS flow A. , data packet 2 and data packet 4 belong to QoS flow B.
  • the PDCP sequence number of the data packet is set according to the PDCP sequence number of the data packet equal to the GTP-U sequence number of the data packet. It can be seen that in the first session, the data packet The PDCP sequence numbers are consecutive and increase sequentially.
  • the first access network device sets the PDCP sequence number of the data packet according to the GTP-U sequence number of the data packet, and sends the data packet to the user equipment.
  • both the source access network device and the target access network device of the user equipment set the PDCP sequence number of the data packet according to this method.
  • the network device switches to the second access network device, because the PDCP sequence numbers set by the first access network device and the second access network device for the same data packets of the same session are the same, and the QoS flows to the wireless bearer
  • the mapping relationship is also the same. Therefore, when the UE switches between different access network devices, the progress of data packet transmission by the access network device can be determined according to the PDCP sequence number, and the user equipment can be reduced by data forwarding technology or data buffering technology. Packet loss during handover.
  • the data transmission method provided by the embodiments of the present application can reduce the loss of data packets during the handover process of the user equipment.
  • the data transmission method provided by this embodiment of the present application may further include steps 1301 to 1304 .
  • Step 1301 The core network device sends second indication information to the first access network device.
  • the second indication information is used to indicate whether the service to which the data packet from the first session belongs is a local service.
  • the core network device can determine whether the service to which the data packet belongs is a local service or a non-local service, and then the core network device sends the first access network device through the indication information. Indicates the type of service to which this packet belongs.
  • the second indication information may include a service identifier, such as a service identifier of an MBS service; in addition, optionally, the second indication information may include local service indication information, and the local service indication information may indicate whether the service is a local service,
  • the second indication information may also be other indication information, which is not limited in this embodiment of the present application.
  • the second indication information may also include local area information of the local service, for example, may include a cell identifier (list), a tracking area identifier (tracking area, TA) ( list) or base station identification (list), etc.
  • the second indication information is further used to indicate the local area to which the first access network device belongs (that is, the local area to which the first access network device belongs).
  • area information of the first access network device the second indication information may indicate in which areas the service content of the service is the same, for example, for the MBS service, the second indication information may be the cell identifier of the MBS service A list (cell list) to indicate which cells have the same service content, or the second indication information is a TA list, to indicate which TAs have the same service content.
  • the above-mentioned indication information sent to the first access network device to indicate whether the service to which the data packet from the first session belongs is a local service may also be used to indicate the local area to which the first access network device belongs.
  • the indication information is different indication information, that is, two independent indication information respectively indicate whether the service to which the data packet from the first session belongs is a local service, and the indication information indicating the local area to which the first access network device belongs is different.
  • the indication information is not specifically limited in this embodiment of the present application.
  • indication information indicating the local area to which the first access network device belongs may be carried in context information of the service.
  • the service to which the data packet acquired by the core network device belongs is a local service, and the core network device determines whether different access network devices belong to the same local area of the same service (for example, the same TMGI service).
  • the first service is a local service.
  • the first access network device if the first access network device belongs to local area 1, and for the second access network device, if the second access network device belongs to local area 2, Then it is determined that the first access network device and the second access network device do not belong to the same local area; if the first access network device belongs to local area 1 and the second access network device belongs to local area 1, it is determined that the first access network device belongs to local area 1.
  • the network access device and the second access network device belong to the same local area.
  • Example Method of setting the GTP-U sequence number and/or setting the QFI sequence number Setting the GTP-U sequence number and/or QFI sequence number of the data packet so that the GTP-U sequence number of the same data packet is the same, and/or the same The QFI sequence numbers of the packets are the same.
  • the service to which the data packet acquired by the core network device belongs is a local service
  • the first access network device and the second access network device belong to the same local area of the same service
  • the core network device reports to the first access network device and the second access network device.
  • the GTP-U sequence numbers of the same data packets are the same, and/or the QFI sequence numbers of the same data packets are the same.
  • the service to which the data packet acquired by the core network device belongs is a local service, and different access network devices do not belong to the same local area of the same service, when the core network device sends the same data packet to different access network devices, there is no need to It is restricted that identical data packets have the same GTP-U sequence number, and/or identical data packets have the same QFI sequence number.
  • the GTP-U sequence number of the same data packet may be the same or different, and/or the QFI sequence number of the same data packet may be the same or different, which can be implemented by the core network device itself, and can be connected to different access network devices. sessions are processed independently.
  • Step 1302 The first access network device receives second indication information from the core network device.
  • the first access network device determines whether the second access network device belongs to the same local area according to the above-mentioned second indication information . For example, the first access network device determines whether the second access network device belongs to the area indicated by the list according to the cell list indicated by the core network device. The network access device and the second access network device do not belong to the same local area of the same service; if the second access network device belongs to the area indicated by the list, it is determined that the first access network device and the second access network device belong to the same area the same local area of the business.
  • Step 1303 When the user equipment is switched from the first access network device to the second access network device, the first access network device sends third indication information to the second access network device.
  • the third indication information is used to indicate that the service to which the data packet from the first session belongs is a local service.
  • the third indication information is further used to indicate the local area to which the first access network device belongs.
  • the above-mentioned indication information sent to the second access network device to indicate whether the service to which the data packet from the first session belongs is a local service may also be used to indicate the local area to which the first access network device belongs.
  • the indication information is different indication information, that is, two independent indication information respectively indicate whether the service to which the data packet from the first session belongs is a local service, and the indication information indicating the local area to which the first access network device belongs is different.
  • the indication information is not specifically limited in this embodiment of the present application.
  • Step 1304 The second access network device receives third indication information from the first access network device.
  • the second access network device determines, according to the third indication information, that the service to which the data packet from the first session belongs is a local service, and the local area to which the first access network device belongs is different from the second access network device.
  • the local areas to which they belong are different local areas (that is, the first access network device and the second access network device do not belong to the same local area of the same service), and the second access network device can determine that the service is a service that crosses local areas , so there is no need to ensure the continuity of the service during the user equipment handover process, that is, there is no need to ensure that no packets are lost, so the above data forwarding process does not need to be performed, and the second access network device does not need to allocate the first access network device.
  • the user equipment does not need to send the PDCP status report to the second access network device after receiving the handover command.
  • the above steps 1301 to 1304 can reduce the implementation complexity of the access network device and the user equipment .
  • the process described in the above steps 901 to 908 can be used to transmit data, so that different access network devices can communicate with each other.
  • the same data packet is set with the same PDCP sequence number, which can ensure the continuity of the service during the UE handover process.
  • the core network device can use the indication information (the second indication information above) to indicate whether the service to which the data packet belongs is a local service or a non-local service, and indicate the local area of the access network device, for the non-local service and the same local area
  • the core network equipment and the access network equipment transmit data according to the data transmission method described in the above steps 901 to 908, so that different access network equipment sets the same PDCP sequence number for the same data packet to ensure that the user equipment Continuity of services during the handover process; for local services not in the same area, the first access network device may further send third indication information to the second access network device, so that the second access network device determines the first access network device.
  • the access network device and the second access network device do not belong to the same local area of the same service, so there is no need to ensure the continuity of the service during the handover process of the user equipment, and there is no need to perform data forwarding, which can reduce the implementation complexity of the access network device and the user equipment. Spend.
  • the embodiment of the present application provides a first access device, where the first access network device is configured to perform each step in the above data transmission method, and the embodiment of the present application may perform the first access network operation according to the above method example.
  • the device divides the functional modules.
  • each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module.
  • the above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules.
  • the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation.
  • FIG. 14 shows a possible schematic structural diagram of the first access network device involved in the foregoing embodiment.
  • the first access network device includes a receiving module 1401 , a determining module 1402 and a sending module 1403 .
  • the receiving module 1401 is configured to receive the first indication information, for example, perform step 906 in the foregoing method embodiments.
  • the determining module 1402 is configured to determine, according to the first indication information, the mapping relationship between the QoS flow of the first session and the radio bearer as the first mapping relationship, for example, perform step 907 in the foregoing method embodiment.
  • the sending module 1403 is configured to transmit the data packet from the first session according to the first mapping relationship, for example, perform step 908 in the foregoing method embodiment.
  • the first access network device provided in the embodiment of the application further includes a processing module 1404, where the processing module 1404 is configured to, when the first mapping relationship is a one-to-one mapping between the QoS flow of the first session and the radio bearer,
  • the PDCP sequence number of the data packet is set according to the QFI sequence number of the data packet from the first session, for example, step 9081 in the foregoing method embodiment is performed.
  • the processing module 1404 is further configured to set the PDCP of the data according to the GTP-U sequence number of the data packet from the first session when the first mapping relationship is that all QoS flows of the first session are mapped to the same radio bearer.
  • Serial number for example, perform step 9082 in the above method embodiment.
  • the above receiving module 1401 is further configured to receive second indication information from the core network device, where the second indication information is used to indicate that the service to which the data packet from the first session belongs is a local service, and the second indication information is also used In order to indicate the local area to which the first access network device belongs, for example, step 1302 in the foregoing method embodiment is performed.
  • the above sending module 1403 is further configured to send third indication information to the second access network device when the user equipment is switched from the first access network device to the second access network device, where the third indication information is used
  • the third indication information is further used to indicate the local area to which the first access network device belongs. For example, step 1303 in the above method embodiment is performed.
  • Each module of the above-mentioned first access network device may also be used to perform other actions in the above-mentioned method embodiments. All relevant contents of each step involved in the above-mentioned method embodiments can be cited in the functional description of the corresponding functional module, which is not described here. Repeat.
  • the first access network device includes: a processing module 1501 and a communication module 1502 .
  • the processing module 1501 is used to control and manage the actions of the first access network device, for example, to perform the steps performed by the above determination module 1402, the processing module 1404, and/or other processes for performing the techniques described herein.
  • the communication module 1502 is used to support the interaction between the first access network device and other devices, for example, performing the steps of the receiving module 1401 and the sending module 1403 above.
  • the first access network device may further include a storage module 1503, where the storage module 1503 is configured to store program codes of the first access network device and data from the first session.
  • the processing module 1501 may be a processor or a controller, for example, the processor in part 81 in FIG. 7 .
  • the communication module 1502 may be a transceiver, an RF circuit, or a communication interface, etc., such as a radio frequency unit in section 80 in FIG. 7 .
  • the storage module 1503 may be a memory, such as the memory of section 81 in FIG. 7 .
  • the embodiment of the present application provides a core network device, and the core network device is configured to perform each step in the above data transmission method.
  • the embodiment of the present application may divide the core network device into functional modules according to the above method example, for example , each function module can be divided according to each function, or two or more functions can be integrated into one processing module.
  • the above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules.
  • the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation.
  • FIG. 16 shows a possible schematic structural diagram of the core network device involved in the foregoing embodiment.
  • the core network device includes a generating module 1601 and a sending module 1602 .
  • the generating module 1601 is configured to generate first indication information, where the first indication information is used to indicate the mapping relationship between the QoS flow of the first session and the radio bearer, for example, perform step 904 in the foregoing method embodiment.
  • the sending module 1602 is configured to send the first indication information to the first access network device, for example, perform step 905 in the foregoing method embodiment.
  • the core network device provided in this embodiment of the present application further includes an acquisition module 1603 and a processing module 1604 .
  • the obtaining module 1603 is configured to obtain data packets from the data server, for example, performing step 901 in the foregoing method embodiments.
  • the processing module 1604 is configured to set the GTP-U sequence number and/or the QFI sequence number of the data packet from the first session, for example, perform step 902 in the above method embodiments.
  • the foregoing sending module 1602 is further configured to send the data packet to the first access network device through the first session, for example, performing step 903 in the foregoing method embodiment.
  • the above-mentioned sending module 1602 is further configured to send second indication information to the first access network device, where the second indication information is used to indicate whether the service to which the data packet from the first session belongs is a local service, and the second indication The information is also used to indicate the local area to which the first access network device belongs. For example, step 1301 in the foregoing method embodiment is performed.
  • Each module of the above-mentioned core network device may also be used to perform other actions in the above-mentioned method embodiments, and all relevant contents of each step involved in the above-mentioned method embodiments can be cited in the functional description of the corresponding functional module, which will not be repeated here.
  • the core network device includes: a processing module 1701 and a communication module 1702 .
  • the processing module 1701 is used to control and manage the actions of the core network equipment, for example, to perform the steps performed by the above-mentioned generating module 1601 , obtaining module 1603 , processing module 1604 , and/or other processes for performing the techniques described herein.
  • the communication module 1702 is used for supporting the interaction between the core network device and other devices, for example, performing the steps of the sending module 1602 .
  • the core network device may further include a storage module 1703, where the storage module 1703 is configured to store program codes of the core network device and data acquired from the data server.
  • the processing module 1701 may be a processor or a controller
  • the communication module 1702 may be a transceiver, an RF circuit or a communication interface, and the like
  • the storage module 1703 may be a memory.
  • the above-mentioned embodiments it may be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • a software program it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the procedures or functions according to the embodiments of the present application are generated in whole or in part.
  • the computer may be a general purpose computer, special purpose computer, computer network, or other programmable device.
  • the computer instructions may be stored on or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted over a wire from a website site, computer, server or data center (eg coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg infrared, wireless, microwave, etc.) to another website site, computer, server or data center.
  • the computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, etc. that includes one or more available media integrated.
  • the available media may be magnetic media (eg, floppy disks, magnetic disks, magnetic tapes), optical media (eg, digital video discs (DVDs)), or semiconductor media (eg, solid state drives (SSDs)), etc. .
  • the disclosed system, apparatus and method may be implemented in other manners.
  • the device embodiments described above are only illustrative.
  • the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be Incorporation may either be integrated into another system, or some features may be omitted, or not implemented.
  • the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as an independent product, may be stored in a computer-readable storage medium.
  • the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, and the computer software products are stored in a storage medium , which includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: flash memory, removable hard disk, read-only memory, random access memory, magnetic disk or optical disk and other media that can store program codes.

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Abstract

本发明实施例提供一种数据传输方法及装置，涉及通信技术领域，能够减少用户设备切换过程中数据包的丢失。该方法包括：核心网设备生成第一指示信息，该第一指示信息用于指示第一会话的QoS流到无线承载的映射关系，然后核心网设备向第一接入网设备发送第一指示信息；进而第一接入网设备接收第一指示信息，并且根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系，以及按照第一映射关系传输来自第一会话的数据包。

Description

一种数据传输方法及装置 技术领域
本申请实施例涉及通信技术领域，尤其涉及一种数据传输方法及装置。
背景技术
随着通信技术的快速发展，多播广播服务(multicast and broadcast service，MBS)越来越受欢迎，多播广播服务可以提供多种多播广播业务(简称为MBS业务，例如直播业务、公共安全业务、批量软件更新业务等)。
目前，核心网设备从MBS业务服务器获取MBS业务数据之后，会通过MBS会话将MBS业务数据发送至基站，然后基站通过无线承载将MBS业务数据发送至用户设备(user equipment，UE)。
在MBS业务数据的传输过程中，当UE发生移动，该UE从源基站切换至目标基站时，由于不同基站传输MBS业务的进度可能不同，所以按照传统的切换方式无法保证UE在切换过程中的业务连续性，即导致UE在切换过程中数据包丢失。
发明内容
本申请实施例提供一种数据传输方法及装置，能够减少用户设备切换过程中数据包的丢失。
为达到上述目的，本申请实施例采用如下技术方案：
第一方面，本申请实施例提供一种数据传输方法，包括：第一接入网设备接收第一指示信息，并且第一接入网设备根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系；以及第一接入网设备按照第一映射关系传输来自第一会话的数据包。
本申请实施例中，第一接入网设备按照核心网设备的指示确定第一会话的QoS流到无线承载的映射关系为第一映射关系，并按照第一映射关系传输数据包，能够减少用户设备切换过程中数据包的丢失，从而为用户设备提供更好的通信服务。
一种可能的实现方式中，上述第一映射关系为第一会话的QoS流与无线承载一对一映射，或者第一会话的所有QoS流与同一无线承载映射。
一种可能的实现方式中，上述按照第一映射关系传输来自第一会话的数据包具体包括：第一映射关系为第一会话的QoS流与无线承载一对一映射，第一接入网设备根据数据包的QFI序列号设置数据包的PDCP序列号，并且发送数据包；第一映射关系为第一会话的所有QoS流与同一无线承载映射，第一接入网设备根据数据包的GTP-U序列号设置数据的PDCP序列号，并且发送数据包。
本申请实施例中，核心网设备获取到某一业务的数据包之后，核心网设备为每一个数据包添加核心网序列号，如GTP-U序列号，另外也可以为每一个数据包添加QFI序列号，核心网设备可以为每一个数据包设置GTP-U序列号和/或QFI序列号；进而核心网设备将数据包发送至接入网设备，接入网设备接收数据包，并且建立会话的QoS流到无线承载的映射，即需要将QoS流的数据包通过映射的无线承载进行传输，这里 假设无线承载与PDCP一一对应，所以用PDCP指代无线承载。接入网设备去掉包含GTP-U序列号和/或QFI序列号的包头以后，将数据包传输到PDCP实体，并且由接入网设备的PDCP实体为数据包设置PDCP序列号，然后基于对应的无线承载将数据包在各个协议层实体处理以后发送至用户设备。
应理解，用户设备的源接入网设备与目标接入网设备均按照该方法设置数据包的PDCP序列号。当用户设备从第一接入网设备切换至第二接入网设备时，由于第一接入网设备和第二接入网设备对相同的QoS流中的相同的数据包设置的PDCP序列号是相同的，而且QoS流到无线承载的映射关系也是相同的，因此，UE在不同的接入网设备之间切换时，可以根据PDCP序列号确定接入网设备传输数据包的进度，并且可以通过data forwarding技术或者data buffering技术减少用户设备切换过程中数据包的丢失。
同理，当用户设备从第一接入网设备切换至第二接入网设备时，由于第一接入网设备和第二接入网设备对同一会话的相同的数据包设置的PDCP序列号是相同的，而且QoS流到无线承载的映射关系也是相同的，因此，UE在不同的接入网设备之间切换时，可以根据PDCP序列号确定接入网设备传输数据包的进度，并且可以通过data forwarding技术或者data buffering技术减少用户设备切换过程中数据包的丢失。
一种可能的实现方式中，上述第一映射关系为第一会话的QoS流与无线承载一对一映射，来自第一会话的数据包的PDCP序列号等于数据包的QFI序列号，或者，数据包的PDCP序列号与数据包的QFI序列号的差值为固定值。或者，第一映射关系为第一会话的所有QoS流与同一无线承载映射，来自第一会话的数据包的PDCP序列号等于数据包的GTP-U序列号，或者，数据包的PDCP序列号与数据包的GTP-U序列号的差值为固定值。
一种可能的实现方式中，第一映射关系为第一会话的QoS流与无线承载一对一映射，且来自第一会话的数据包的PDCP序列号的最大长度小于数据包的QFI序列号的长度，数据包的PDCP序列号满足：A＝(B)mod(X)，其中，其中，A表示数据包的PDCP序列号，B表示数据包的QFI序列号，X表示PDCP序列号的最大值，mod表示取模运算。或者，第一映射关系为第一会话的所有QoS流与同一无线承载映射，且来自第一会话的数据包的PDCP序列号的最大长度小于数据包的GTP-U序列号的长度，数据包的PDCP序列号满足：A＝(C)mod(X)，其中，A表示数据包的PDCP序列号，C表示数据包的GTP-U序列号，X表示PDCP序列号的最大值，mod表示取模运算。
通过上述方法设置数据包的PDCP序列号，可以保证根据QFI序列号设置的PDCP序列号不超过PDCP序列号的最大值；或者，保证根据GTP-U序列号设置的PDCP序列号不超过PDCP序列号的最大值。
一种可能的实现方式中，第一接入网设备根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系具体包括：第一指示信息指示第一映射关系。
可选地，上述第一指示信息为显式的指示信息，该第一指示信息中可以包括第一映射关系。或者，第一指示信息可以为一个索引，该索引指示第一映射关系，第一接入网设备根据该索引确定第一映射关系，索引与第一映射关系的对应关系可以由核心 网设备预先配置或者在协议中预定义。
一种可能的实现方式中，第一接入网设备根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系具体包括：第一接入网设备根据第一指示信息判断来自第一会话的数据包是否满足预设条件，如果数据包满足预设条件，第一接入网设备根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系，该第一指示信息包括QoS标识或QoS参数值。
可以理解的是，第一接入网设备根据第一指示信息判断来自第一会话的数据包满足预设条件，则说明该第一会话的数据包所属的业务在接入网设备切换时需保证无损传输或高可靠性传输，换句话说，对于该业务，不同的接入网设备需要对该业务的相同数据包设置相同的PDCP序列号；另外，对于该业务接入网设备需要按照第一映射关系建立QoS流到无线承载的映射。
可选地，在第一接入网设备根据第一指示信息判断来自第一会话的数据包满足预设条件的情况下，第一接入网设备根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系的方式可以为两种方式，一种方式是第一指示信息中包括第一映射关系，则第一接入网设备可以从第一指示信息中获取第一映射关系；另一种方式是第一映射关系预先定义在协议中或者预先由核心网设备配置给接入网设备，当第一接入网设备根据第一指示信息判断来自第一会话的数据包满足预设条件，第一接入网设备根据协议的预先定义或者预先配置确定第一映射关系。
可选地，第一指示信息包括QoS标识或QoS参数值，该QoS标识或QoS参数值可以携带在第一会话建立请求消息中。
针对第一指示信息的内容，上述预设条件可以为QoS标识满足一定的条件或者或QoS参数值满足一定的条件，可选地，该预设条件可以通过核心网设备配置给基站或者预先定义协议中。
一种可能的实现方式中，上述QoS标识包括5QI；QoS参数值包括下述至少一种优先级、包时延预算或包误码率。
以QoS标识为上述5QI为例，上述预设条件可以为数据包的5QI等于预设值；以QoS参数值为优先级为例，上述预设条件可以为优先级大于或等于预设优先级；以QoS参数值为包误码率为例，上述预设条件还可以为数据包的包误码率低于预设门限值。
需要注意的是，这里预设条件中的大小关系仅为示例，并不做严格限定，例如预设条件是某一QoS参数大于、小于、等于、大于或等于或者小于或等于的情况均落入本实施例保护范围。
一种可能的实现方式中，本申请实施例提供的数据传输方法还包括：第一接入网设备从核心网设备接收第二指示信息，该第二指示信息用于指示来自第一会话的数据包所属的业务为本地业务。
可选地，第二指示信息可以包含业务标识，例如MBS业务的业务标识；另外可选地，第二指示信息可以包含本地业务指示信息，该本地业务指示信息可以指示该业务是否为本地业务，第二指示信息也可以为其他指示信息，本申请实施例不作限定。另外可选地，第二指示信息也可以包含本地业务的本地区域信息，例如可以包含该本地业务对应的至少一个本地区域所包含的小区标识(列表)、跟踪区标识(列表)或者 基站标识(列表)等。
一种可能的实现方式中，上述第二指示信息还用于指示第一接入网设备所属的本地区域。
上述向第一接入网设备发送的用于指示来自第一会话的数据包所属的业务是否为本地业务的指示信息也可以与用于指示第一接入网设备所属的本地区域的指示信息为不同的指示信息，即通过两个独立的指示信息分别指示来自第一会话的数据包所属的业务是否为本地业务，指示第一接入网设备所属的本地区域的指示信息为不同的指示信息。
一种可能的实现方式中，本申请实施例提供的数据传输方法还包括：当用户设备从第一接入网设备切换至第二接入网设备时，第一接入网设备向第二接入网设备发送第三指示信息，该第三指示信息用于指示来自第一会话的数据包所属的业务为本地业务。
一种可能的实现方式中，上述第三指示信息还用于指示第一接入网设备所属的本地区域。
本申请实施例中，第二接入网设备根据第三指示信息确定来自第一会话的数据包所属的业务是本地业务，并且第一接入网设备所属的本地区域与第二接入网设备所属的本地区域是不同的本地区域(即第一接入网设备和第二接入网设备不属于相同业务的同一本地区域)，第二接入网设备可以确定该业务是跨本地区域的业务，因此在用户设备切换过程中无需保证业务的连续性，即无需保证不丢包，则无需执行上述data forwarding的流程，那么第二接入网设备也无需为第一接入网设备分配用于data forwarding的转发隧道信息，并且第二接入网设备在切换请求确认消息中也无需配置PDCP状态报告，则用户设备在收到切换命令之后，也无需向第二接入网设备发送PDCP状态报告。
本申请实施例中，通过指示信息指示数据包所属的业务是本地业务还是非本地业务，且指示接入网设备的本地区域，针对非本地业务和同一本地区域内的本地业务，保证用户设备切换过程中业务的连续性；针对非同一区域内的本地业务，无需保证用户设备切换过程中业务的连续性，能够降低接入网设备和用户设备的实现复杂度。
第二方面，本申请实施例提供一种数据传输方法，包括：核心网设备生成第一指示信息，该第一指示信息用于指示第一会话的QoS流到无线承载的映射关系；并且核心网设备向第一接入网设备发送第一指示信息。由于核心网设备可以向接入网设备指示会话的QoS流到无线承载的映射关系以使得接入设备按照指示的映射关系传输数据，从而在UE切换的过程中，能够减少用户设备切换过程中数据包的丢失，从而为用户设备提供更好的通信服务。
一种可能的实现方式中，上述第一会话的QoS流到无线承载的映射关系为第一映射关系，第一映射关系为第一会话的QoS流与无线承载一对一映射，或者第一会话的所有QoS流与同一无线承载映射。
一种可能的实现方式中，上述第一指示信息包括QoS标识或QoS参数值。
一种可能的实现方式中，上述QoS标识包括5QI；上述QoS参数值包括下述至少一种：优先级、包时延预算或包误码率。
一种可能的实现方式中，本申请实施例提供的数据传输方法还包括：核心网设备从数据服务器获取数据包；并且核心网设备设置数据包的GTP-U序列号和/或QFI序列号；以及核心网设备通过第一会话向第一接入网设备发送数据包。
本申请实施例中，核心网设备对通过第一会话传输的数据包统一设置数据包的GTP-U序列号，属于该第一会话的数据包的GTP-U SN依次递增。核心网设备对通过第一会话传输的数据包，按照数据包所属QoS流，在每一个QoS流内部统一设置数据包的QFI序列号，不同QoS流中的数据包的QFI SN是独立设置的，在一个QoS流中，属于该QoS流的数据包的QFI SN依次递增。
一种可能的实现方式中，来自第一会话的数据包所属的业务为本地业务，且第一接入网设备和第二接入网设备属于相同业务的同一本地区域，核心网设备向第一接入网设备和第二接入网设备发送相同的数据包时，相同的数据包的GTP-U序列号相同，和/或相同的数据包的QFI序列号相同。
本申请实施例中，核心网设备根据获取的数据包所属的业务服务质量(QoS)需求判断该业务在UE移动的过程中是否需要保证无损传输或者高可靠传输，如果该业务在UE移动的过程中需要保证无损传输或者高可靠传输，则核心网设备将相同的数据包发送至不同的接入网设备时，核心网设备为相同的数据包设置相同的GTP-U序列号，和/或为相同的数据包设置相同的QFI序列号。也就是说，对于相同的业务(例如TMGI相同的业务)，核心网设备向不同的接入网设备发送相同的数据包时，相同的数据包的GTP-U序列号相同，和/或相同的数据包的QFI序列号相同。
一种可能的实现方式中，本申请实施例提供的数据传输方法还包括：核心网设备向第一接入网设备发送第二指示信息，该第二指示信息用于指示来自第一会话的数据包所属的业务是否为本地业务。
一种可能的实现方式中，上述第二指示信息还用于指示第一接入网设备所属的本地区域。
本申请实施例中，若核心网设备获取的数据包所属的业务是本地业务，并且不同的接入网设备属于相同业务的同一本地区域，核心网设备向不同的接入网设备发送相同的数据包时，设置数据包的GTP-U序列号和/或QFI序列号，使得相同的数据包的GTP-U序列号相同，和/或相同的数据包的QFI序列号相同。
若核心网设备获取的数据包所属的业务是本地业务，并且不同的接入网设备不属于相同业务的同一本地区域，则核心网设备向不同的接入网设备发送相同的数据包时，无需限制相同的数据包的GTP-U序列号相同，和/或相同的数据包的QFI序列号相同。相同的数据包的GTP-U序列号可以相同也可以不同，和/或相同的数据包的QFI序列号可以相同，也可以不同。
关于第二方面的相关内容及对应的技术效果，可参考第一方面的内容和技术效果，此处不再赘述。
第三方面，本申请实施例提供一种第一接入网设备，包括接收模块、确定模块以及发送模块。其中，接收模块用于接收第一指示信息；确定模块用于根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系；发送模块用于按照第一映射关系传输来自第一会话的数据包。
一种可能的实现方式中，上述第一映射关系为第一会话的QoS流与无线承载一对一映射，或者第一会话的所有QoS流与同一无线承载映射。
一种可能的实现方式中，第一接入网设备还包括处理模块，该处理模块用于在第一映射关系为第一会话的QoS流与无线承载一对一映射的情况下，根据数据包的QFI序列号设置数据包的PDCP序列号；发送模块用于发送数据包。处理模块还用于在第一映射关系为第一会话的所有QoS流与同一无线承载映射的情况下，根据数据包的GTP-U序列号设置数据的PDCP序列号；发送模块用于发送数据包。
一种可能的实现方式中，上述第一映射关系为第一会话的QoS流与无线承载一对一映射，来自第一会话的数据包的PDCP序列号等于数据包的QFI序列号，或者，数据包的PDCP序列号与数据包的QFI序列号的差值为固定值。或者，第一映射关系为第一会话的所有QoS流与同一无线承载映射，来自第一会话的数据包的PDCP序列号等于数据包的GTP-U序列号，或者，数据包的PDCP序列号与数据包的GTP-U序列号的差值为固定值。
一种可能的实现方式中，第一映射关系为第一会话的QoS流与无线承载一对一映射，且来自第一会话的数据包的PDCP序列号的最大长度小于数据包的QFI序列号的长度，数据包的PDCP序列号满足：A＝(B)mod(X)，其中，A表示数据包的PDCP序列号，B表示数据包的QFI序列号，X表示PDCP序列号的最大值，mod表示取模运算。或者，第一映射关系为第一会话的所有QoS流与同一无线承载映射，且来自第一会话的数据包的PDCP序列号的最大长度小于数据包的GTP-U序列号的长度，数据包的PDCP序列号满足：A＝(C)mod(X)，其中，A表示数据包的PDCP序列号，C表示数据包的GTP-U序列号，X表示PDCP序列号的最大值，mod表示取模运算。
一种可能的实现方式中，上述第一接入网设备根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系具体包括：第一指示信息指示第一映射关系。
一种可能的实现方式中，上述第一接入网设备根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系具体包括：第一接入网设备根据第一指示信息判断数据包是否满足预设条件，如果数据包满足预设条件，第一接入网设备根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系，该第一指示信息包括QoS标识或QoS参数值。
一种可能的实现方式中，上述QoS标识包括5G服务质量标识5QI；上述QoS参数值包括下述至少一种优先级、包时延预算或包误码率。
一种可能的实现方式中，上述接收模块还用于从核心网设备接收第二指示信息，该第二指示信息用于指示来自第一会话的数据包所属的业务为本地业务。
一种可能的实现方式中，上述第二指示信息还用于指示第一接入网设备所属的本地区域。
一种可能的实现方式中，上述发送模块还用于在用户设备从第一接入网设备切换至第二接入网设备的情况下，向第二接入网设备发送第三指示信息，该第三指示信息用于指示来自第一会话的数据包所属的业务为本地业务。
一种可能的实现方式中，上述第三指示信息还用于指示第一接入网设备所属的本 地区域。
第四方面，本申请实施例提一种核心网设备，包括生成模块和发送模块。其中，生成模块用于生成第一指示信息，该第一指示信息用于指示第一会话的QoS流到无线承载的映射关系；发送模块用于向第一接入网设备发送第一指示信息。
一种可能的实现方式中，上述第一会话的QoS流到无线承载的映射关系为第一映射关系，第一映射关系为第一会话的QoS流与无线承载一对一映射，或者第一会话的所有QoS流与同一无线承载映射。
一种可能的实现方式中，上述第一指示信息包括QoS标识或QoS参数值。
一种可能的实现方式中，上述QoS标识包括5QI；上述QoS参数值包括下述至少一种：优先级、包时延预算或包误码率。
一种可能的实现方式中，核心网设备还包括获取模块和处理模块。其中，获取模块用于从数据服务器获取数据包；处理模块用于设置数据包的GTP-U序列号和/或QFI序列号；上述发送模块还用于通过第一会话向第一接入网设备发送数据包。
一种可能的实现方式中，来自第一会话的数据包所属的业务为本地业务，且第一接入网设备和第二接入网设备属于相同业务的同一本地区域，核心网设备向第一接入网设备和第二接入网设备发送相同的数据包时，相同的数据包的GTP-U序列号相同，和/或相同的数据包的QFI序列号相同。
一种可能的实现方式中，上述发送模块还用于向第一接入网设备发送第二指示信息，该第二指示信息用于指示来自第一会话的数据包所属的业务是否为本地业务。
一种可能的实现方式中，上述第二指示信息还用于指示第一接入网设备所属的本地区域。
第五方面，本申请实施例提供一种第一接入网设备，包括处理器和与处理器耦合连接的存储器；存储器用于存储计算机指令，当第一接入网设备运行时，处理器执行存储器存储的计算机指令，以使得第一接入网设备执行上述第一方面及其可能的实现方式中任意之一所述的方法。
第六方面，本申请实施例提供一种计算机可读存储介质，该计算机可读存储介质包括计算机程序，当计算机程序在计算机上运行时，以执行上述第一方面及其可能的实现方式中任意之一所述的方法。
第七方面，本申请实施例提供一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行第一方面及其可能的实现方式中任意之一所述的方法。
第八方面，本申请实施例提供一种芯片，包括存储器和处理器。存储器用于存储计算机指令。处理器用于从存储器中调用并运行该计算机指令，以执行第一方面及其可能的实现方式中任意之一所述的方法。
第九方面，本申请实施例提供一种核心网设备，包括处理器和与处理器耦合连接的存储器；存储器用于存储计算机指令，当核心网设备运行时，处理器执行存储器存储的计算机指令，以使得核心网设备执行上述第二方面及其可能的实现方式中任意之一所述的方法。
第十方面，本申请实施例提供一种计算机可读存储介质，该计算机可读存储介质包括计算机程序，当计算机程序在计算机上运行时，以执行上述第二方面及其可能的 实现方式中任意之一所述的方法。
第十一方面，本申请实施例提供一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行第二方面及其可能的实现方式中任意之一所述的方法。
第十二方面，本申请实施例提供一种芯片，包括存储器和处理器。存储器用于存储计算机指令。处理器用于从存储器中调用并运行该计算机指令，以执行第二方面及其可能的实现方式中任意之一所述的方法。
第十三方面，本申请实施例提供一种通信系统，包括上述第三方面所述的第一接入网设备或第五方面所述的第一接入网设备、第四方面所述的核心网设备或者第九方面所述的核心网设备、第二接入网设备以及用户设备。
应当理解的是，本申请实施例的第三方面至第十三方面技术方案及对应的可能的实施方式所取得的有益效果可以参见上述对第一方面、第二方面及其对应的可能的实施方式的技术效果，此处不再赘述。
附图说明
图1为本申请实施例提供的一种MBS业务的传输过程示意图；
图2为本申请实施例提供的一种本地MBS业务的示意图；
图3为本申请实施例提供的用户面协议栈的结构示意图；
图4为本申请实施例提供的一种UE的切换过程的方法示意图；
图5为本申请实施例提供的一种UE的切换示意图；
图6为本申请实施例提供的一种MBS会话的映射关系示意图；
图7为本申请实施例提供的一种数据传输方法的应用场景示意图；
图8为本申请实施例提供的一种基站的硬件示意图；
图9为本申请实施例提供的一种数据传输方法示意图一；
图10为本申请实施例提供的一种数据传输方法示意图二；
图11为本申请实施例提供的一种数据包的PDCP序列号的设置示意图一；
图12为本申请实施例提供的一种数据包的PDCP序列号的设置示意图二；
图13为本申请实施例提供的一种数据传输方法示意图三；
图14为本申请实施例提供的一种第一接入网设备的结构示意图一；
图15为本申请实施例提供的一种第一接入网设备的结构示意图二；
图16为本申请实施例提供的一种核心网设备的结构示意图一；
图17为本申请实施例提供的一种核心网设备的结构示意图二。
具体实施方式
本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。
本申请实施例的说明书和权利要求书中的术语“第一”和“第二”等是用于区别不同的对象，而不是用于描述对象的特定顺序。例如，第一接入网设备和第二接入网设备等是用于区别不同的接入网设备，而不是用于描述接入网设备的特定顺序；第一指示信息、第二指示信息以及第三指示信息等适用于区别不同的指示信息，而不是用于描述指示信息的特定顺序。
在本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
在本申请实施例的描述中，除非另有说明，“多个”的含义是指两个或两个以上。例如，多个处理单元是指两个或两个以上的处理单元；多个系统是指两个或两个以上的系统。
首先对本申请实施例提供的一种数据传输的方法及装置中涉及的一些概念做解释说明。
多播广播服务业务(MBS业务)：是面向多个UE的业务，常见的MBS业务包括直播业务、公共安全业务、批量软件更新业务等。参考图1，MBS业务的数据传输过程具体包括：核心网设备从MBS服务器(指产生MBS业务数据的服务器)获取MBS业务数据，然后核心网设备通过核心网设备与接入网设备(例如基站)之间建立的MBS会话向接入网设备发送MBS业务数据，进而接入网设备向多个UE发送同一MBS业务数据。
可选地，MBS业务数据传输方式(即接入网设备向多个UE发送MBS业务数据的方式)可以为点到多点(point to multi-point，PTM)的传输方式或者点到点(point to point，PTP)的传输方式。
可以理解的是，MBS业务可以分为本地MBS业务和非本地MBS业务。其中，非本地业务指的是在所有的区域内，MBS业务的内容相同；本地MBS业务指的是在本地的一定区域内有效的业务，对于业务标识相同的MBS业务(可以称为同一MBS业务)，在不同的区域该MBS业务的内容可能不同，并且不同区域的MBS业务的业务数据可以由不同MBS服务器提供。例如某些V2X业务、公共安全业务为本地MBS业务。MBS业务的业务标识可以为临时多播组标识(temporary multicast group identifier，TMGI)。
示例性的，参考图2，对于具有相同业务标识(TMGI)的本地V2X业务，在本地区域1和本地区域2中所广播的内容是不同的，即对于相同业务标识的本地V2X业务，本地区域1的V2X业务对应的内容(图2中的content 1)与本地区域2的V2X业务对应的内容(图2中的content 2)不同。例如，当图2中的车辆从本地区域2向本地区域1行驶，当该车辆行驶至本地区域2，未进入本地区域1时，该车辆接收到的MBS业务的内容为content 2；当该车辆行驶至本地区域1和本地区域2的重合区域时，该车辆既可以接收到content 1，也可以接收到content 2；当该车辆行驶至本地区域1，且驶出了本地区域2时，该车辆接收到的MBS业务的内容为content 1。
无线接入网侧协议栈：无线接入网侧的UE与接入网设备具有协议栈，UE与接入网设备基于协议栈进行通信，协议栈包括控制面的协议栈和用户面的协议栈。
用户面的协议栈中，UE和接入网设备的协议栈的结构均包括无线资源控制(radio resource control，RRC)层、业务数据适配(service data adaptation protocol，SDAP)层、分组数据汇聚协议(packet data convergence protocol，PDCP)层、无线链路控制(radio link control，RLC)层、媒体接入控制(media access control，MAC)层以及物 理层(PHY层)。其中，物理层位于最底层，属于层一；SDAP层、PDCP层、RLC层以及MAC层属于第二层(层二)；RRC层输入第三层(层三)。
图3是用户面协议栈的结构示意图，需要说明的是，图3中仅示意出了用户面协议栈的层二和层一的结构，层三未示意。图3中的箭头所示的传输方向是MBS业务的数据传输方向，即接入网设备向UE发送数据的过程示意。
结合图3，在接入网设备侧，数据到达接入网设备的SDAP层，通过SDAP层完成业务的QoS流到无线承载的映射之后，数据传输至PDCP层并经过PDCP层的处理(例如包括头压缩、加密、完整性保护等)之后再依次传输至RLC层和MAC层，并在RLC层和MAC层进行相应的处理，进而数据从物理层(PHY层)发送出去，通过空口传输至UE侧，然后UE的各个协议层按照与接入网设备相反的处理顺序对数据依次进行相应的处理。
应理解，上述接入网设备和UE的各个协议层均对应有功能实体，并且每一个协议层对应一个或多个功能实体，如此，各个协议层的功能由各个协议层对应的功能实体实现，例如，PDCP层对应的功能实体为PDCP实体。
无线承载：接入网设备与UE进行通信时需要建立无线承载，进而基于无线承载传输消息或数据。参考图3，上述接入网设备与UE的各个协议层对数据包的处理结合起来可以称为无线承载，应理解，无线承载的划分是以PDCP实体进行划分的，具体的，一个无线承载中包含一个PDCP实体，例如PDCP层建立了2个PDCP实体，则对应2个无线承载。一个无线承载中可以包含至少一个RLC实体，一个RLC实体对应一个逻辑信道。
切换技术(handover)：切换指的是在UE与接入网设备(例如基站)通信的过程中，由于UE的移动，源基站无法再为UE提供满足UE需求的服务，UE需断开与源基站的连接，然后建立与目标基站的连接，后续地，通过目标基站为UE提供服务，这一过程称为UE需从源基站切换至目标基站。
参考图4，UE从源基站切换至目标基站的过程包括步骤401至步骤409。
步骤401、源基站发送RRC重配置消息(RRCReconfigration)至连接态的UE。
该RRC重配置消息中包括测量对象、测量报告配置信息、测量标识等信息。
步骤402、UE根据RRC重配置消息对多个小区进行RRC测量，生成测量报告(Measure Report)并将测量报告发送至源基站。
应理解，测量报告中包括信号强度、信号接收功率等指标数据。
步骤403、源基站根据UE上报的测量报告确定UE是否需要切换(Handover Decision)。
步骤404、源基站确定UE需要切换时，源基站向目标基站发送切换请求消息(Handover Request)。
步骤405、目标基站确定是否允许UE接入(Admission Control)。
可选地，目标基站可以根据该目标基站的连接数等的情况确定是否允许UE接入，例如，目标基站的连接数较小时，目标基站允许UE接入；目标基站的连接数较大，该目标基站无法再为UE提供服务，则目标基站不允许UE接入。
步骤406、目标基站确定允许UE接入时，目标基站向源基站发送切换确认消息 (Handover Request ACK)。
该切换确认消息中包括UE待接入的目标小区的信息以及UE接入该目标小区所需的一些配置参数。目标小区的信息包括该目标小区的物理小区标识(physical cell identifier，PCI)，目标小区对应的频率信息，例如目标小区对应频点，具体的，在NR系统中，小区的频率信息的内容可参考协议TS38331中对FrequencyInfoDL IE的具体描述。UE接入目标小区所需的配置参数还可以包括UE接入目标小区所需的RACH资源信息(例如专用RACH资源和/或RACH资源)。
步骤407、源基站向UE发送切换命令。
该切换命令可以通过RRC重配置消息发送该切换命令，该切换命令中包含上述目标小区的信息以及UE接入该目标小区所需的一些配置参数。
步骤408、UE根据切换指令对目标基站发起随机接入(Random Access)。
步骤409、UE发送RRC重配置完成消息(RRCReconifiguration Complete)给目标基站。
可以理解的是，UE在切换的过程中，UE会断开与源基站的连接，在成功接入目标基站之前UE收发数据可能会出现短暂的中断。
应理解，在上述MBS业务数据传输过程中也可能会发生UE切换，例如，图5中的UE2由于发生位置移动从第一接入网设备切换至第二接入网设备，UE2切换至第二接入网设备之后，由第二接入网设备向UE2发送MBS业务的数据。
下面从数据包的传输过程详细介绍MBS业务的数据的传输过程，结合图1，核心网设备通过MBS会话向接入网设备发送MBS业务的数据包。可以理解的是，一个MBS会话对应一个传输通道(例如一个GTP-U隧道或N3接口)，一个MBS会话或一个传输通道包含一个或多个服务质量流(quality of service，QoS)流，即QoS flow，MBS会话的QoS流也可以称为MBS flow或者其他名称，本申请实施例不作限定。一个无线承载对应一个分组数据汇聚协议(packet data convergence protocol，PDCP)实体。
核心网设备获取到MBS业务的数据包之后，核心网设备为每一个数据包添加核心网序列号，如通用分组无线服务隧道协议-用户面序列号(GPRS tunneling protocol-U serial number，GTP-U SN)，另外也可以为每一个数据包添加QoS流标识序列号(QoS flow identification serial number，QFI SN)，核心网设备可以为每一个数据包设置GTP-U SN和/或QFI SN。具体的，GTP-U SN的设置规则是：在一个MBS会话中进行统一设置，即在一个MBS会话中，属于该MBS会话的数据包的GTP-U SN依次递增，GTP-U SN的设置与该MBS会话包含的QoS流无关，即GTP-U SN不区分QoS流。QFI SN的设置规则是：在一个QoS流中进行统一设置，并且不同QoS流中的数据包的QFI SN是独立设置的，即在一个QoS流中，属于该QoS流的数据包的QFI SN依次递增，不同QoS流数据包QFI SN的设置互不影响。
示例性的，参考图6，以一个MBS会话为例，该MBS会话包括3个QoS流，分别记为QoS flow A，QoS flow B，QoS flow C，对于该MBS会话中的连续的6个数据包为例，分别记为数据包1、数据包2、数据包3、数据包4、数据包5以及数据包6，按照上述GTP-U SN的设置规则，这6个数据包的GTP-U SN依次可以为：1，2，3， 4，5，6。其中，数据包1和数据包4属于QoS flow A，数据包2和数据包5属于QoS flow B，数据包3和数据包6属于QoS flow C，按照上述QFI SN的设置规则，QoS flow A中的数据包1和数据包4的QFI SN依次为1，2；QoS flow B中的数据包2和数据包5的QFI SN依次为1，2；QoS flow C中的数据包3和数据包6的QFI SN依次为1，2。
综上，核心网设备对其接收到的数据包设置了GTP-U SN和/或QFI SN之后，将数据包发送至接入网设备，接入网设备接收数据包，并且建立MBS会话的QoS流到无线承载的映射，即需要将QoS流的数据包通过映射的无线承载进行传输，这里假设无线承载与PDCP一一对应，所以用PDCP指代无线承载。接入网设备去掉包含GTP-U SN和/或QFI SN的包头以后，将数据包传输到PDCP实体，并且由接入网设备的PDCP实体为数据包设置PDCP SN，然后基于对应的无线承载将数据包在各个协议层实体处理以后发送至用户设备。具体的，接入网设备是按照MBS会话的QoS流到无线承载的映射关系，通过无线承载传输相应QoS流的数据包。可选地，MBS会话的QoS流到无线承载的映射关系可以包括但不限于：MBS会话的QoS流与无线承载一对一映射，即一个QoS流对应一个无线承载，且一个无线承载对应一个QoS流，或者可以理解为同一个QoS流的所有数据包都只通过同一个无线承载传输，而该无线承载仅用于传输该QoS的数据包；MBS会话的QoS流与无线承载多对一映射，即多个QoS流对应一个无线承载；MBS会话的所有QoS流与同一个无线承载映射，即所有的QoS流对应一个无线承载，或者可以理解为该MBS会话与无线承载一对一映射，该MBS会话中的所有数据包都通过一个无线承载进行传输。
可选地，本申请实施例中，接入网设备可以根据数据包的GTP-U SN或数据包的QFI SN设置数据包的PDCP SN。仍以图6所示的MBS会话为例，该MBS会话包含的三个QoS流与无线承载的映射为：QoS flow A和QoS flow C映射到无线承载A(可以记为PDCP A，指的是PDCP实体A)；QoS flow B映射到无线承载B(记为PDCP B)，那么QoS flow A和QoS flow C的数据包通过无线承载A传输，由PDCP A为QoS flow A和QoS flow C的数据包添加PDCP SN；QoS flow B的数据包通过无线承载B传输，由PDCP B为QoS flow B的数据包添加PDCP SN。假设根据GTP-U SN设置数据包的PDCP SN，且数据包的PDCP SN等于GTP-U SN，该MBS会话的数据包的PDCP SN具体参考图6。
可以理解的，即使通信系统中的每一个基站都按照上述方式设置数据包的PDCP SN，在切换过程中，也可能会出现数据包丢失。具体的，在MBS业务传输过程中，当UE从一个接入网设备切换至另有一个接入网设备时，由于不同接入网设备对相同的MBS业务的数据包的传输进度可能不同，并且不同的接入网设备独立设置QoS流到无线承载的映射关系，例如，对于业务标识相同的MBS业务，不同的接入网设备建立的MBS会话的QoS流与无线承载的映射关系可能不同，不同的接入网设备对相同的数据包设置的PDCP SN也就会不同，因此，UE在切换过程中两个接入网设备无法获知对方实际传输数据包的状态，则可能导致UE在切换的过程中出现数据包丢失。
另外，UE切换过程中导致数据包丢失的现象不仅限于MBS业务，单播业务中也可能存在丢包的问题。
基于背景技术存在的问题，本申请实施例提供一种数据传输方法及装置，核心网设备可以向第一接入网设备发送第一指示信息，然后第一接入网设备接收到第一指示信息后，根据第一指示信息确定当前会话(称为第一会话)的QoS流到无线承载的映射关系为第一映射关系，进而第一接入网设备按照第一映射关系传输来自第一会话的数据包。通信系统中的接入网设备按照本申请实施例提供的数据传输方法传输数据包，能够减少用户设备切换过程中数据包的丢失，从而为用户设备提供更好的通信服务。
本申请实施例提供的数据传输方法可以应用于通信系统中的一个实体向另一个实体发送信息，另一个实体接收信息的场景中，并且该方法可用于接入网设备与一个用户设备通信的场景，即单播业务场景；该方法也可以用于接入网设备与多个用户设备通信的场景，即多播广播(MBS)业务场景。可选地，该方法可以应用于可应用于5G NR系统，也可以应用于其他通信系统。
示例性的，以5G NR系统为例，接入网设备可以基站，用户设备可以为UE。如图7所示为本申请实施例提供的一种应用场景，在图7中，通信系统包括基站和6个UE，分别记为UE1～UE6，在该通信系统中，基站可以分别向UE1～UE6发送下行数据，UE1～UE6可以向基站发送上行数据。可选地，通信系统中的UE4、UE5和UE6可以组成一个通信系统，基站发送下行数据至UE1、UE2、UE3以及UE5，然后UE5再发送下行信息至UE4和UE6，UE4和UE6也可以通过UE5向基站发送上行信息。
可选地，本申请实施例中的接入网设备例如第一接入网设备、第二接入网设备)，可以为基站，该基站可以通常所用的基站，演进型基站(evolved node base station，eNB)，5G系统中的下一代基站(next generation node base station，gNB)、新型无线电基站(new radio eNB)、宏基站、微基站、高频基站或发送和接收点(transmission and reception point，TRP))等设备。示例性的，本申请实施例以通常所用的基站为例，介绍网络设备的硬件结构。下面结合图8具体介绍本申请实施例提供的基站的各个构成部件。如图8所示，本申请实施例提供的基站可以包括：80部分以及81部分。80部分主要用于射频信号的收发以及射频信号与基带信号的转换；81部分主要用于基带处理，对基站进行控制等。80部分通常可以称为收发单元、收发机、收发电路、或者收发器等。81部分通常是基站的控制中心，通常可以称为处理单元。
80部分的收发单元，也可以称为收发机，或收发器等，其包括天线和射频单元，或者仅包括射频单元或其中的部分其中射频单元主要用于进行射频处理。可选地，可以将80部分中用于实现接收功能的器件视为接收单元，将用于实现发送功能的器件视为发送单元，即80部分包括接收单元和发送单元。接收单元也可以称为接收机、接收器、或接收电路等，发送单元可以称为发射机、发射器或者发射电路等。
81部分可以包括一个或多个单板或芯片，每个单板或芯片可以包括一个或多个处理器和一个或多个存储器，处理器用于读取和执行存储器中的程序以实现基带处理功能以及对基站的控制。若存在多个单板，各个单板之间可以互联以增加处理能力。作为一种可选的实施方式，也可以是多个单板共用一个或多个处理器，或者是多个单板共用一个或多个存储器。其中，存储器和处理器可以是集成在一起的，也可以是独立设置的。在一些实施例中，80部分和81部分可以是集成在一起的，也可以是独立设置的。另外，81部分中的全部功能可以集成在一个芯片中实现，也可以部分功能集成 在一个芯片中实现另外一部分功能集成在其他一个或多个芯片中实现，本申请实施例对此不进行限定。
本申请实施例中的核心网设备可以为5G NR系统中的相关网络功能(network function，NF)，例如接入和移动管理功能(access and mobility management function，AMF)、会话管理功能(session management function，SMF)以及用户面功能(user plane function，UPF)等。其中，UPF主要负责用户面数据包的相关处理，可以用于从数据网络(数据服务器)中获取数据包，为数据包设置核心网序列号，然后将数据包发送至接入网设备；AMF主要负责数据面信令的相关处理，例如可以用于生成指示信息等，并向接入网设备发送指示信息(例如下述实施例中的第一指示信息、第二指示信息)；SMF主要负责将一些数据包处理策略发送给UPF等。
当然，核心网设备也可以为4G等其他通信系统中具有上述功能的网元或网络功能，具体根据实际情况确定，本申请实施例不作限定。
结合上述应用场景可知，本申请实施例提供的数据传输方法可以用于传输MBS业务，也可以用于传输单播业务，本申请实施例不作限定。在本申请实施例中，以MBS业务为例对本申请实施例提供的数据传输方法进行详细描述。如图9所示，本申请实施例提供的数据传输方法包括步骤901至步骤908。
步骤901、核心网设备从数据服务器获取数据包。
本申请实施例中，核心网设备从数据服务器或者内容服务器获取的数据包是某一业务的数据包，其中，核心网设备可以直接或者间接从数据服务器或者内容服务器获取数据包，例如数据包从数据服务器或者内容服务器经过网关或者其他转发设备发送给核心网设备。核心网设备获取到该业务的数据包之后，核心网设备通过核心网设备与接入网设备之间的传输通道或者通信接口向接入网设备发送数据包。可以理解的是，一个传输通道或者通信接口对应一个会话，以下实施例称为第一会话，第一会话是核心网设备与第一接入网设备之间建立的用于传输某一业务的数据的会话，第一会话可以包含一个或多个QoS流。
对于MBS业务，该第一会话为一个MBS会话，该MBS会话包含的QoS流可以称为MBS流(即MBS flow)。
步骤902、核心网设备设置数据包的GTP-U序列号和/或QFI序列号。
参考上述实施例中描述的关于设置GTP-U序列号(即GTP-U SN)的方法和设置QFI序列号(即QFI SN)的方法，核心网设备对通过第一会话传输的数据包统一设置数据包的GTP-U序列号，属于该第一会话的数据包的GTP-U SN依次递增。核心网设备对通过第一会话传输的数据包，按照数据包所属QoS流，在每一个QoS流内部统一设置数据包的QFI序列号，不同QoS流中的数据包的QFI SN是独立设置的，在一个QoS流中，属于该QoS流的数据包的QFI SN依次递增。可选地，除这两种SN之外，还可以为MBS业务新设计一种SN，例如MBS SN，本申请实施例不做限定。
本申请实施例中，核心网设备根据获取的数据包所属的业务服务质量(QoS)需求判断该业务在UE移动的过程中是否需要保证无损传输或者高可靠传输，如果该业务在UE移动的过程中需要保证无损传输或者高可靠传输，则核心网设备将相同的数据包发送至不同的接入网设备时，核心网设备为相同的数据包设置相同的GTP-U序列 号，和/或为相同的数据包设置相同的QFI序列号。也就是说，对于相同的业务(例如TMGI相同的业务)，核心网设备向不同的接入网设备发送相同的数据包时，相同的数据包的GTP-U序列号相同，和/或相同的数据包的QFI序列号相同。
例如，核心网设备通过第一会话向第一接入网设备发送的第一数据包的GTP-U序列号与核心网设备通过第二会话向第二接入网设备发送的第一数据包的GTP-U序列号相同，和/或核心网设备通过第一会话的QoS流向第一接入网设备发送的第一数据包的QFI序列号与核心网设备通过第二会话的QoS流向第二接入网设备发送的第一数据包的QFI序列号相同。
需要说明的是，本申请实施例中的相同的数据包指的是数据包的内容相同并且数据包的大小相同，核心网设备将一个数据包复制成的多个数据包，该多个数据包可以称为相同的数据包。
步骤903、核心网设备通过第一会话向第一接入网设备发送数据包。
步骤904、核心网设备生成第一指示信息。
该第一指示信息用于指示第一会话的QoS流到无线承载的映射关系。
步骤905、核心网设备向第一接入网设备发送第一指示信息。
可选地，核心网设备可以通过第一会话建立/修改请求消息或者QoS流建立/修改请求消息向第一接入网设备发送第一指示信息，也可以通过其他消息向第一接入网设备发送第一指示信息，本申请实施例不作限定。
步骤906、第一接入网设备接收第一指示信息。
步骤907、第一接入网设备根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系。
上述第一映射关系为第一会话的QoS流与无线承载一对一映射，或者第一会话的所有QoS流与同一无线承载映射。
示例性的，第一会话包含3个QoS流，分别记为QoS flow A，QoS flow B和QoS flow C，表1示出了第一会话的QoS流与无线承载一对一映射的一种示例，表2示出了第一会话的QoS流与同一无线承载映射的一种示例。
表1
QoS流 无线承载
QoS flow A 无线承载A
QoS flow B 无线承载B
QoS flow C 无线承载C
表2
QoS流 无线承载
QoS flow A 无线承载A
QoS flow B 无线承载A
QoS flow C 无线承载A
在一种实现方式中，上述第一接入网设备根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系具体包括：第一指示信息指示第一映射关系，如此，第一接入网设备接收到第一指示信息时，第一接入网设备根据该第一指示信息 的指示确定第一映射关系。
可选地，第一指示信息为显式的指示信息，该第一指示信息中可以包括第一映射关系。或者，第一指示信息可以为一个索引，该索引指示第一映射关系，第一接入网设备根据该索引确定第一映射关系，索引与第一映射关系的对应关系可以由核心网设备预先配置或者在协议中预定义。
在另一种实现方式中，上述第一接入网设备根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系具体包括：第一接入网设备根据第一指示信息判断来自第一会话的数据包或者其所属的业务是否满足预设条件，如果该数据包或者其所属的业务满足预设条件，第一接入网设备根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系。
可以理解的是，第一接入网设备根据第一指示信息判断来自第一会话的数据包满足预设条件，则说明该第一会话的数据包所属的业务在接入网设备切换时需保证无损传输或高可靠性传输，换句话说，对于该业务，不同的接入网设备需要对该业务的相同数据包设置相同的PDCP序列号；另外，对于该业务接入网设备需要按照第一映射关系建立QoS流到无线承载的映射。
可选地，在第一接入网设备根据第一指示信息判断来自第一会话的数据包满足预设条件的情况下，第一接入网设备根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系的方式可以为两种方式，一种方式是第一指示信息中包括第一映射关系，则第一接入网设备可以从第一指示信息中获取第一映射关系；另一种方式是第一映射关系预先定义在协议中或者预先由核心网设备配置给接入网设备，当第一接入网设备根据第一指示信息判断来自第一会话的数据包满足预设条件，第一接入网设备根据协议的预先定义或者预先配置确定第一映射关系。
可选地，第一指示信息包括QoS标识或QoS参数值，该QoS标识或QoS参数值可以携带在第一会话建立请求消息中。其中，QoS标识可以包括5G服务质量标识(5G quality of service identity，5QI)；QoS参数值包括下述至少一种优先级、包时延预算或包误码率。可选地，QoS参数值可以是上述现有的QoS参数的值，该QoS参数值也可以是本申请实施例新定义的一种QoS参数的值，具体根据实际需求选择，此处不作限定。
针对第一指示信息的内容，上述预设条件可以为QoS标识满足一定的条件或者或QoS参数值满足一定的条件，可选地，该预设条件可以通过核心网设备配置给基站或者预先定义协议中。
以QoS标识为上述5QI为例，上述预设条件可以为数据包的5QI等于预设值，例如，该预设条件为数据包的5QI等于73，第一接入网设备接收到第一指示信息之后，第一接入网设备从第一指示信息中获取数据包的5QI，然后第一接入网设备判断第一指示信息中携带的5QI是否等于73，在第一指示信息中的5QI等于73的情况下，第一接入网设备根据第一指示信息确定第一映射关系。
以QoS参数值为优先级为例，上述预设条件可以为优先级大于或等于预设优先级，第一接入网设备接收到第一指示信息之后，第一接入网设备从第一指示信息中获取优先级，然后第一接入网设备判断第一指示信息中携带的优先级是否大于或等于预设优 先级，在第一指示信息中的优先级大于或等于预设优先级的情况下，第一接入网设备根据第一指示信息确定第一映射关系。
以QoS参数值为包误码率为例，上述预设条件还可以为数据包的包误码率低于预设门限值，第一接入网设备接收到第一指示信息之后，第一接入网设备从第一指示信息中获取包误码率，然后第一接入网设备判断第一指示信息中携带的包误码率是否低于预设门限值，在第一指示信息中的包误码率低于预设门限值的情况下，第一接入网设备根据第一指示信息确定第一映射关系。
需要注意的是，这里预设条件中的大小关系仅为示例，并不做严格限定，例如预设条件是某一QoS参数大于、小于、等于、大于或等于或者小于或等于的情况均落入本实施例保护范围。
步骤908、第一接入网设备按照第一映射关系传输来自第一会话的数据包。
本申请实施例中，第一接入网设备确定第一会话的QoS流与无线承载的映射关系为第一映射关系，第一接入网设备建立第一会话的QoS流与无线承载的映射，然后，第一接入网设备按照第一映射关系传输来自第一会话的数据包。
可选地，结合图9，如图10所示，上述步骤908具体包括步骤9081或步骤9082
步骤9081、第一映射关系为第一会话的QoS流与无线承载一对一映射，第一接入网设备根据数据包的QFI序列号设置该数据包的PDCP序列号，并且发送该数据包。
在一种实施方式中，来自第一会话的数据包的PDCP序列号等于该数据包的QFI序列号，或者，该数据包的PDCP序列号与该数据包的QFI序列号的差值为固定值。该固定值可以是协议预定义或者核心网设备预配置或者通过第一指示信息指示。
在另一种实施方式中，若数据包的PDCP序列号的最大长度小于该数据包的QFI序列号的最大长度，则该数据包的PDCP序列号满足：A＝(B)mod(X)，其中，A表示数据包的PDCP序列号，B表示数据包的QFI序列号，X表示PDCP序列号的最大值，mod表示取模运算，这样可以保证根据QFI序列号设置的PDCP序列号不超过PDCP序列号的最大值。
示例性的，图11为第一会话的QoS流与无线承载一对一映射时，来自第一会话的数据包的PDCP序列号的设置示意图。在图11中，第一会话的QoS流包括QoS flow A和QoS flow B，以来自第一会话的5个连续的数据包为例，数据包1、数据包3以及数据包5属于QoS flow A，数据包2和数据包4属于QoS flow B，此时，按照数据包的PDCP序列号等于该数据包的QFI序列号设置数据包的PDCP序列号，可见在同一个QoS流中，数据包的PDCP序列号是连续的，并且依次增加。
本申请实施例中，第一会话的QoS流与无线承载一对一映射，第一接入网设备根据数据包的QFI序列号设置该数据包的PDCP序列号，并且发送该数据包至用户设备。应理解，用户设备的源接入网设备与目标接入网设备均按照该方法设置数据包的PDCP序列号，结合上述图4所示的切换流程，当用户设备从第一接入网设备切换至第二接入网设备时，由于第一接入网设备和第二接入网设备对相同的QoS流中的相同的数据包设置的PDCP序列号是相同的，而且QoS流到无线承载的映射关系也是相同的，因此，UE在不同的接入网设备之间切换时，可以根据PDCP序列号确定接入网设备传输数据包的进度，并且可以通过data forwarding技术或者data buffering技术减少用户设 备切换过程中数据包的丢失。
可以理解的是，data forwarding技术指的是在UE切换的过程中，第一接入网设备将来自第一会话的数据包发送至第二接入网设备，从而当用户设备切换成功之后，由第二接入网设备将其从第一接入网设备接收到的数据包发送至用户设备，以减少用户设备切换过程中数据包的丢失。data buffering技术指的是用户设备切换过程中，第二接入网设备将其接收的来自第一会话的数据包缓存下来，当用户设备切换成功之后，由第二接入网设备将其缓存的数据包发送至用户设备，以减少用户设备切换过程中数据包的丢失。
步骤9082、第一映射关系为第一会话的所有QoS流与同一无线承载映射，第一接入网设备根据数据包的GTP-U序列号设置数据的PDCP序列号，并且发送该数据包。
在一种实施方式中，来自第一会话的数据包的PDCP序列号等于该数据包的GTP-U序列号，或者，该数据包的PDCP序列号与该数据包的GTP-U序列号的差值为固定值。同理，该固定值可以是协议预定义或者核心网设备预配置或者通过第一指示信息指示。
在另一种实施方式中，若数据包的PDCP序列号的最大长度小于该数据包的GTP-U序列号的最大长度，则该数据包的PDCP序列号满足：A＝(C)mod(X)，其中，A表该数据包的PDCP序列号，C表示该数据包的GTP-U序列号，X表示PDCP序列号的最大值，mod表示取模运算，这样可以保证根据GTP-U序列号设置的PDCP序列号不超过PDCP序列号的最大值。
示例性的，图12为第一会话的所有QoS流与同一无线承载映射时，来自第一会话的数据包的PDCP序列号的设置示意图。在图12中，第一会话的QoS流包括QoS flow A和QoS flow B，以来自第一会话的5个连续的数据包为例，数据包1、数据包3以及数据包5属于QoS flow A，数据包2和数据包4属于QoS flow B，此时，按照数据包的PDCP序列号等于该数据包的GTP-U序列号设置数据包的PDCP序列号，可见在第一会话中，数据包的PDCP序列号是连续的，并且依次增加。
本申请实施例中，第一会话的所有QoS流与同一无线承载映射，第一接入网设备根据数据包的GTP-U序列号设置该数据包的PDCP序列号，并且发送该数据包至用户设备。应理解，用户设备的源接入网设备与目标接入网设备均按照该方法设置数据包的PDCP序列号，同理，结合上述图4所示的切换流程，当用户设备从第一接入网设备切换至第二接入网设备时，由于第一接入网设备和第二接入网设备对同一会话的相同的数据包设置的PDCP序列号是相同的，而且QoS流到无线承载的映射关系也是相同的，因此，UE在不同的接入网设备之间切换时，可以根据PDCP序列号确定接入网设备传输数据包的进度，并且可以通过data forwarding技术或者data buffering技术减少用户设备切换过程中数据包的丢失。
综上，通过本申请实施例提供的数据传输方法，能够减少用户设备切换过程中数据包的丢失。
可选地，如图13所示，上述核心网设备从数据服务器获取数据包之后，本申请实施例提供的数据传输方法还可以包括步骤1301至步骤1304。
步骤1301、核心网设备向第一接入网设备发送第二指示信息。
第二指示信息用于指示来自第一会话的数据包所属的业务是否为本地业务。
本申请实施例中，核心网设备从数据服务器获取到数据包之后，核心网设备可以确定数据包所属的业务是本地业务还是非本地业务，然后核心网设备通过指示信息向第一接入网设备指示该数据包所属的业务的类型。
可选地，第二指示信息可以包含业务标识，例如MBS业务的业务标识；另外可选地，第二指示信息可以包含本地业务指示信息，该本地业务指示信息可以指示该业务是否为本地业务，第二指示信息也可以为其他指示信息，本申请实施例不作限定。另外可选地，第二指示信息也可以包含本地业务的本地区域信息，例如可以包含该本地业务对应的至少一个本地区域所包含的小区标识(列表)、跟踪区标识(tracking area，TA)(列表)或者基站标识(列表)等。
本申请实施例中，当第一接入网设备确定上述第一会话的数据包所属的业务为本地业务时，上述第二指示信息还用于指示第一接入网设备所属的本地区域(即第一接入网设备的area信息)，该第二指示信息可以指示在哪些区域内该业务的业务内容是相同的，例如，对于MBS业务，该第二指示信息可以为该MBS业务的小区标识列表(cell list)，以指示在哪些小区内业务内容相同，或者该第二指示信息为TA列表，以指示在哪些TA内业务内容相同。
可选地，上述向第一接入网设备发送的用于指示来自第一会话的数据包所属的业务是否为本地业务的指示信息也可以与用于指示第一接入网设备所属的本地区域的指示信息为不同的指示信息，即通过两个独立的指示信息分别指示来自第一会话的数据包所属的业务是否为本地业务，指示第一接入网设备所属的本地区域的指示信息为不同的指示信息，本申请实施例不作具体限定。
例如，指示第一接入网设备所属的本地区域的指示信息可以携带在该业务的上下文信息中。
本申请实施例中，核心网设备获取的数据包所属的业务是本地业务，核心网设备确定不同的接入网设备是否属于相同业务(例如TMGI相同的业务)的同一本地区域。例如第一业务为本地业务，对于第一接入网设备，若该第一接入网设备属于本地区域1，对于第二接入网设备，若该第二接入网设备属于本地区域2，则确定第一接入网设备与第二接入网设备不属于同一本地区域；若第一接入网设备属于本地区域1，该第二接入网设备属于本地区域1，则确定第一接入网设备与第二接入网设备属于同一本地区域。
若核心网设备获取的数据包所属的业务是本地业务，并且不同的接入网设备属于相同业务的同一本地区域，核心网设备向不同的接入网设备发送相同的数据包时，按照上述实施例设置GTP-U序列号和/或设置QFI序列号的方法设置数据包的GTP-U序列号和/或QFI序列号，使得相同的数据包的GTP-U序列号相同，和/或相同的数据包的QFI序列号相同。
例如，核心网设备获取的数据包所属的业务为本地业务，且第一接入网设备和第二接入网设备属于相同业务的同一本地区域，核心网设备向第一接入网设备和第二接入网设备发送相同的数据包时，相同的数据包的GTP-U序列号相同，和/或相同的数据包的QFI序列号相同。
若核心网设备获取的数据包所属的业务是本地业务，并且不同的接入网设备不属于相同业务的同一本地区域，则核心网设备向不同的接入网设备发送相同的数据包时，无需限制相同的数据包的GTP-U序列号相同，和/或相同的数据包的QFI序列号相同。相同的数据包的GTP-U序列号可以相同也可以不同，和/或相同的数据包的QFI序列号可以相同，也可以不同，可以由核心网设备自己实现，对与不同接入网设备连接的会话进行独立处理。
步骤1302、第一接入网设备从核心网设备接收第二指示信息。
本申请实施例中，当用户设备从第一接入网设备向第二接入网设备切换时，第一接入网设备根据上述第二指示信息确定第二接入网设备是否属于同一本地区域。例如第一接入网设备根据核心网设备指示的小区列表确定第二接入网设备是否属于该列表指示的区域，若第二接入网设备不属于该列表指示的区域，则确定第一接入网设备与第二接入网设备不属于相同业务的同一本地区域；若第二接入网设备属于该列表指示的区域，则确定第一接入网设备与第二接入网设备属于相同业务的同一本地区域。
步骤1303、当用户设备从第一接入网设备切换至第二接入网设备时，第一接入网设备向第二接入网设备发送第三指示信息。
第三指示信息用于指示来自第一会话的数据包所属的业务为本地业务。
可选地，该第三指示信息还用于指示第一接入网设备所属的本地区域。
同理，上述向第二接入网设备发送的用于指示来自第一会话的数据包所属的业务是否为本地业务的指示信息也可以与用于指示第一接入网设备所属的本地区域的指示信息为不同的指示信息，即通过两个独立的指示信息分别指示来自第一会话的数据包所属的业务是否为本地业务，指示第一接入网设备所属的本地区域的指示信息为不同的指示信息，本申请实施例不作具体限定。
步骤1304、第二接入网设备从第一接入网设备接收第三指示信息。
本申请实施例中，第二接入网设备根据第三指示信息确定来自第一会话的数据包所属的业务是本地业务，并且第一接入网设备所属的本地区域与第二接入网设备所属的本地区域是不同的本地区域(即第一接入网设备和第二接入网设备不属于相同业务的同一本地区域)，第二接入网设备可以确定该业务是跨本地区域的业务，因此在用户设备切换过程中无需保证业务的连续性，即无需保证不丢包，则无需执行上述data forwarding的流程，那么第二接入网设备也无需为第一接入网设备分配用于data forwarding的转发隧道信息，并且第二接入网设备在切换请求确认消息中也无需配置PDCP状态报告，则用户设备在收到切换命令之后，也无需向第二接入网设备发送PDCP状态报告。对于第一接入网设备所属的本地区域与第二接入网设备所属的本地区域是不同的本地区域的情况，通过上述步骤1301至步骤1304能够降低接入网设备和用户设备的实现复杂度。
综上，一方面，本申请实施例提供的数据传输方法中，无论是本地业务还是非本地业务，均可以采用上述步骤901至步骤908所描述的过程传输来数据，使得不同接入网设备对相同的数据包设置相同的PDCP序列号，能够保证UE切换过程中业务的连续性。
另一方面，核心网设备可以通过指示信息(上述第二指示信息)指示数据包所属 的业务是本地业务还是非本地业务，且指示接入网设备的本地区域，针对非本地业务和同一本地区域内的本地业务，核心网设备和接入网设备按照上述步骤901至步骤908描述的数据传输方法传输数据，使得不同接入网设备对相同的数据包设置相同的PDCP序列号，以保证用户设备切换过程中业务的连续性；针对非同一区域内的本地业务，第一接入网设备还可以进一步向第二接入网设备发送第三指示信息，从而第二接入网设备确定第一接入网设备和第二接入网设备不属于相同业务的同一本地区域，则无需保证用户设备切换过程中业务的连续性，进而无需执行data forwarding，能够降低接入网设备和用户设备的实现复杂度。
相应地，本申请实施例提供一种第一接入设备，该第一接入网设备用于执行上述数据传输方法中各个的步骤，本申请实施例可以根据上述方法示例对第一接入网设备进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。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。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。
在采用对应各个功能划分各个功能模块的情况下，图14示出上述实施例中所涉及的第一接入网设备的一种可能的结构示意图。如图14所示，该第一接入网设备包括接收模块1401、确定模块1402以及发送模块1403。
接收模块1401用于接收第一指示信息，例如执行上述方法实施例中的步骤906。
确定模块1402用于根据第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系，例如执行上述方法实施例中的步骤907。
发送模块1403用于按照第一映射关系传输来自第一会话的数据包，例如执行上述方法实施例中的步骤908。
可选地，申请实施例提供的第一接入网设备还包括处理模块1404，该处理模块1404用于在第一映射关系为第一会话的QoS流与无线承载一对一映射的情况下，根据来自第一会话的数据包的QFI序列号设置数据包的PDCP序列号，例如执行上述方法实施例中的步骤9081。
可选地，处理模块1404还用于在第一映射关系为第一会话的所有QoS流与同一无线承载映射的情况下，根据来自第一会话的数据包的GTP-U序列号设置数据的PDCP序列号，例如执行上述方法实施例中的步骤9082。
可选地，上述接收模块1401，还用于从核心网设备接收第二指示信息，该第二指示信息用于指示来自第一会话的数据包所属的业务为本地业务，第二指示信息还用于指示第一接入网设备所属的本地区域，例如执行上述方法实施例中的步骤1302。
可选地，上述发送模块1403还用于当用户设备从第一接入网设备切换至第二接入网设备时，向第二接入网设备发送第三指示信息，该第三指示信息用于指示来自第一会话的数据包所属的业务为本地业务，第三指示信息还用于指示第一接入网设备所属的本地区域，例如，执行上述方法实施例中的步骤1303。
上述第一接入网设备的各个模块还可以用于执行上述方法实施例中的其他动作，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在采用集成的单元的情况下，本申请实施例提供的第一接入网设备的结构示意图如图15所示。在图15中，第一接入网设备包括：处理模块1501和通信模块1502。处理模块1501用于对第一接入网设备的动作进行控制管理，例如，执行上述确定模块1402、处理模块1404执行的步骤，和/或用于执行本文所描述的技术的其它过程。通信模块1502用于支持第一接入网设备与其他设备之间的交互等，例如执行上述接收模块1401和发送模块1403的步骤。如图15所示，第一接入网设备还可以包括存储模块1503，存储模块1503用于存储第一接入网设备的程序代码和来自第一会话的数据。
其中，处理模块1501可以是处理器或控制器，例如图7中的81部分的处理器。通信模块1502可以是收发器、RF电路或通信接口等，例如图7中的80部分的射频单元。存储模块1503可以是存储器，例如图7中的81部分的存储器。
相应地，本申请实施例提供一种核心网设备，该核心网设备用于执行上述数据传输方法中各个的步骤，本申请实施例可以根据上述方法示例对核心网设备进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。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。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。
在采用对应各个功能划分各个功能模块的情况下，图16示出上述实施例中所涉及的核心网设备的一种可能的结构示意图。如图16所示，该核心网设备包括生成模块1601和发送模块1602。
生成模块1601用于生成第一指示信息，该第一指示信息用于指示第一会话的QoS流到无线承载的映射关系，例如执行上述方法实施例中的步骤904。
发送模块1602用于向第一接入网设备发送第一指示信息，例如执行上述方法实施例中的步骤905。
可选地，本申请实施例提供的核心网设备还包括获取模块1603和处理模块1604。获取模块1603用于从数据服务器获取数据包，例如执行上述方法实施例中的步骤901。处理模块1604用于设置来自第一会话的数据包的GTP-U序列号和/或QFI序列号，例如执行上述方法实施例中的步骤902。上述发送模块1602还用于通过第一会话向第一接入网设备发送该数据包，例如执行上述方法实施例中的步骤903。
可选地，上述发送模块1602还用于向第一接入网设备发送第二指示信息，该第二指示信息用于指示来自第一会话的数据包所属的业务是否为本地业务，第二指示信息还用于指示第一接入网设备所属的本地区域，例如，执行上述方法实施例中的步骤1301。
上述核心网设备的各个模块还可以用于执行上述方法实施例中的其他动作，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在采用集成的单元的情况下，本申请实施例提供的核心网设备的结构示意图如图17所示。在图17中，核心网设备包括：处理模块1701和通信模块1702。处理模块1701用于对核心网设备的动作进行控制管理，例如，执行上述生成模块1601、获取模块1603、处理模块1604执行的步骤，和/或用于执行本文所描述的技术的其它过程。 通信模块1702用于支持核心网设备与其他设备之间的交互等，例如执行发送模块1602的步骤。如图17所示，核心网设备还可以包括存储模块1703，存储模块1703用于存储核心网设备的程序代码和从数据服务器获取的数据。
其中，处理模块1701可以是处理器或控制器，通信模块1702可以是收发器、RF电路或通信接口等，存储模块1703可以是存储器。
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。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式实现。该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该计算机指令时，全部或部分地产生按照本申请实施例中的流程或功能。该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。该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，该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(digital subscriber line，DSL))方式或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心传输。该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括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。该可用介质可以是磁性介质(例如，软盘、磁盘、磁带)、光介质(例如，数字视频光盘(digital video disc，DVD))、或者半导体介质(例如固态硬盘(solid state drives，SSD))等。
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将装置的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述模块或单元的划分，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，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本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：快闪存储器、移动硬盘、只读存储器、随机存取存储器、磁碟或者光盘等各种可以存储程序代码的介质。
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 (30)

  1. 一种数据传输方法，其特征在于，包括：
    第一接入网设备接收第一指示信息；
    所述第一接入网设备根据所述第一指示信息确定第一会话的服务质量QoS流到无线承载的映射关系为第一映射关系；
    所述第一接入网设备按照所述第一映射关系传输来自所述第一会话的数据包。
  2. 根据权利要求1所述的方法，其特征在于，
    所述第一映射关系为所述第一会话的QoS流与无线承载一对一映射，或者所述第一会话的所有QoS流与同一无线承载映射。
  3. 根据权利要求1或2所述的方法，其特征在于，按照所述第一映射关系传输来自所述第一会话的数据包，包括：
    所述第一映射关系为所述第一会话的QoS流与无线承载一对一映射，所述第一接入网设备根据所述数据包的服务质量流标识QFI序列号设置所述数据包的分组数据汇聚协议PDCP序列号，并且发送所述数据包；
    所述第一映射关系为所述第一会话的所有QoS流与同一无线承载映射，所述第一接入网设备根据所述数据包的通用分组无线服务隧道协议-用户面GTP-U序列号设置所述数据的PDCP序列号，并且发送所述数据包。
  4. 根据权利要求3所述的方法，其特征在于，
    所述第一映射关系为所述第一会话的QoS流与无线承载一对一映射，所述数据包的PDCP序列号等于所述数据包的QFI序列号，或者，所述数据包的PDCP序列号与所述数据包的QFI序列号的差值为固定值；或者，
    所述第一映射关系为所述第一会话的所有QoS流与同一无线承载映射，所述数据包的PDCP序列号等于所述数据包的GTP-U序列号，或者，所述数据包的PDCP序列号与所述数据包的GTP-U序列号的差值为固定值。
  5. 根据权利要求3所述的方法，其特征在于，
    所述第一映射关系为所述第一会话的QoS流与无线承载一对一映射，且所述数据包的PDCP序列号的最大长度小于所述数据包的QFI序列号的长度，所述数据包的PDCP序列号满足：
    A＝(B)mod(X)
    其中，A表示所述数据包的PDCP序列号，B表示所述数据包的QFI序列号，X表示PDCP序列号的最大值，mod表示取模运算；或者，
    所述第一映射关系为所述第一会话的所有QoS流与同一无线承载映射，且所述数据包的PDCP序列号的最大长度小于所述数据包的GTP-U序列号的长度，所述数据包的PDCP序列号满足：
    A＝(C)mod(X)
    其中，A表示所述数据包的PDCP序列号，C表示所述数据包的GTP-U序列号，X表示PDCP序列号的最大值，mod表示取模运算。
  6. 根据权利要求1至5任一项所述的方法，其特征在于，所述第一接入网设备根据所述第一指示信息确定第一会话的QoS流到无线承载的映射关系为所述第一映射关 系，包括：
    所述第一指示信息指示所述第一映射关系。
  7. 根据权利要求1至5任一项所述的方法，其特征在于，
    所述第一接入网设备根据所述第一指示信息确定第一会话的QoS流到无线承载的映射关系为第一映射关系，包括：
    所述第一接入网设备根据所述第一指示信息判断所述数据包是否满足预设条件，如果所述数据包满足所述预设条件，所述第一接入网设备根据所述第一指示信息确定所述第一会话的QoS流到无线承载的映射关系为第一映射关系，所述第一指示信息包括QoS标识或QoS参数值。
  8. 根据权利要求7所述的方法，其特征在于，
    所述QoS标识包括5G服务质量标识5QI；
    所述QoS参数值包括下述至少一种优先级、包时延预算或包误码率。
  9. 根据权利要求1至8任一项所述的方法，其特征在于，所述方法还包括：
    所述第一接入网设备从所述核心网设备接收第二指示信息，所述第二指示信息用于指示所述数据包所属的业务为本地业务。
  10. 根据权利要求9所述的方法，其特征在于，
    所述第二指示信息还用于指示所述第一接入网设备所属的本地区域。
  11. 根据权利要求9或10所述的方法，其特征在于，所述方法还包括：
    当用户设备从所述第一接入网设备切换至第二接入网设备时，所述第一接入网设备向所述第二接入网设备发送第三指示信息，所述第三指示信息用于指示所述数据包所属的业务为本地业务。
  12. 根据权利要求11所述的方法，其特征在于，
    所述第三指示信息还用于指示所述第一接入网设备所属的本地区域。
  13. 一种数据传输方法，其特征在于，包括：
    核心网设备生成第一指示信息，所述第一指示信息用于指示第一会话的服务质量QoS流到无线承载的映射关系；
    所述核心网设备向第一接入网设备发送所述第一指示信息。
  14. 根据权利要求13所述的方法，其特征在于，
    所述第一会话的QoS流到无线承载的映射关系为第一映射关系，所述第一映射关系为所述第一会话的QoS流与无线承载一对一映射，或者所述第一会话的所有QoS流与同一无线承载映射。
  15. 根据权利要求13或14所述的方法，其特征在于，
    所述第一指示信息包括QoS标识或QoS参数值。
  16. 根据权利要求15所述的方法，其特征在于，
    所述QoS标识包括5G服务质量标识5QI；
    所述QoS参数值包括下述至少一种：优先级、包时延预算或包误码率。
  17. 根据权利要求13至16任一项所述的方法，其特征在于，所述方法还包括：
    所述核心网设备从数据服务器获取数据包；
    所述核心网设备设置所述数据包的通用分组无线服务隧道协议-用户面GTP-U序 列号和/或服务质量流标识QFI序列号；
    所述核心网设备通过所述第一会话向所述第一接入网设备发送所述数据包。
  18. 根据权利要求17所述的方法，其特征在于，
    所述数据包所属的业务为本地业务，且所述第一接入网设备和第二接入网设备属于相同业务的同一本地区域，所述核心网设备向所述第一接入网设备和所述第二接入网设备发送相同的数据包时，所述相同的数据包的GTP-U序列号相同，和/或所述相同的数据包的QFI序列号相同。
  19. 根据权利要求13至18任一项所述的方法，其特征在于，所述方法还包括：
    所述核心网设备向所述第一接入网设备发送第二指示信息，所述第二指示信息用于指示所述数据包所属的业务是否为本地业务。
  20. 根据权利要求19所述的方法，其特征在于，
    所述第二指示信息还用于指示所述第一接入网设备所属的本地区域。
  21. 一种第一接入网设备，其特征在于，包括接收模块、确定模块以及发送模块；
    所述接收模块，用于接收第一指示信息；
    所述确定模块，用于根据所述第一指示信息确定第一会话的服务质量QoS流到无线承载的映射关系为第一映射关系；
    所述发送模块，用于按照所述第一映射关系传输来自所述第一会话的数据包。
  22. 根据权利要求21所述的第一接入网设备，其特征在于，
    所述第一映射关系为所述第一会话的QoS流与无线承载一对一映射，或者所述第一会话的所有QoS流与同一无线承载映射。
  23. 根据权利要求21或22所述的第一接入网设备，其特征在于，所述第一接入网设备还包括处理模块；
    所述处理模块，用于在所述第一映射关系为所述第一会话的QoS流与无线承载一对一映射的情况下，根据所述数据包的服务质量流标识QFI序列号设置所述数据包的分组数据汇聚协议PDCP序列号；所述发送模块，用于发送所述数据包；
    所述处理模块，还用于在所述第一映射关系为所述第一会话的所有QoS流与同一无线承载映射的情况下，根据所述数据包的通用分组无线服务隧道协议-用户面GTP-U序列号设置所述数据的PDCP序列号；所述发送模块，用于发送所述数据包。
  24. 根据权利要求21至23任一项所述的第一接入网设备，其特征在于，
    所述接收模块，还用于从所述核心网设备接收第二指示信息，所述第二指示信息用于指示所述数据包所属的业务为本地业务。
  25. 根据权利要求24所述的第一接入网设备，其特征在于，
    所述发送模块，还用于在用户设备从所述第一接入网设备切换至第二接入网设备的情况下，向所述第二接入网设备发送第三指示信息，所述第三指示信息用于指示所述数据包所属的业务为本地业务。
  26. 一种核心网设备，其特征在于，包括生成模块和发送模块；
    所述生成模块，用于生成第一指示信息，所述第一指示信息用于指示第一会话的服务质量QoS流到无线承载的映射关系；
    所述发送模块，用于向第一接入网设备发送所述第一指示信息。
  27. 根据权利要求26所述的核心网设备，其特征在于，
    所述第一会话的QoS流到无线承载的映射关系为第一映射关系，所述第一映射关系为所述第一会话的QoS流与无线承载一对一映射，或者所述第一会话的所有QoS流与同一无线承载映射。
  28. 根据权利要求26或27所述的核心网设备，其特征在于，所述核心网设备还包括获取模块和处理模块；
    所述获取模块，用于从数据服务器获取数据包；
    所述处理模块，用于设置所述数据包的通用分组无线服务隧道协议-用户面GTP-U序列号和/或服务质量流标识QFI序列号；
    所述发送模块，还用于通过所述第一会话向所述第一接入网设备发送所述数据包。
  29. 根据权利要求28所述的核心网设备，其特征在于，
    所述数据包所属的业务为本地业务，且所述第一接入网设备和第二接入网设备属于相同业务的同一本地区域，所述核心网设备向所述第一接入网设备和所述第二接入网设备发送相同的数据包时，所述相同的数据包的GTP-U序列号相同，和/或所述相同的数据包的QFI序列号相同。
  30. 根据权利要求26至29任一项所述的核心网设备，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第二指示信息，所述第二指示信息用于指示所述数据包所属的业务是否为本地业务。
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US20230345323A1 (en) 2023-10-26
CN116548012A (zh) 2023-08-04

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