WO2021185350A1 - 一种通信方法、接入网设备、终端设备和核心网设备 - Google Patents

一种通信方法、接入网设备、终端设备和核心网设备 Download PDF

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Publication number
WO2021185350A1
WO2021185350A1 PCT/CN2021/081772 CN2021081772W WO2021185350A1 WO 2021185350 A1 WO2021185350 A1 WO 2021185350A1 CN 2021081772 W CN2021081772 W CN 2021081772W WO 2021185350 A1 WO2021185350 A1 WO 2021185350A1
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WIPO (PCT)
Prior art keywords
network device
access network
data packet
indication information
service
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PCT/CN2021/081772
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English (en)
French (fr)
Inventor
许斌
李秉肇
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华为技术有限公司
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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 BR112022018830A priority Critical patent/BR112022018830A2/pt
Priority to EP21771538.2A priority patent/EP4124107A4/en
Priority to MX2022011639A priority patent/MX2022011639A/es
Priority to KR1020227036489A priority patent/KR20220155383A/ko
Priority to JP2022556613A priority patent/JP2023517390A/ja
Publication of WO2021185350A1 publication Critical patent/WO2021185350A1/zh
Priority to US17/947,651 priority patent/US20230012998A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0007—Control or signalling for completing the hand-off for multicast or broadcast services, e.g. MBMS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1642—Formats specially adapted for sequence numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/023—Buffering or recovering information during reselection
    • H04W36/0235—Buffering or recovering information during reselection by transmitting sequence numbers, e.g. SN status transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0093—Point-to-multipoint
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/34—Flow control; Congestion control ensuring sequence integrity, e.g. using sequence numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H04W36/087—Reselecting an access point between radio units of access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast

Definitions

  • This application relates to the field of communications, and more specifically, to a communication method, access network equipment, terminal equipment, and core network equipment.
  • Multimedia Broadcast Multicast Service is a service for multiple terminal devices.
  • live broadcast service and some public safety services belong to MBMS service.
  • the MBMS service can be sent to the terminal device in a unicast transmission mode by establishing a dedicated bearer with a single terminal device, or it can be shared with multiple terminal devices.
  • the bearer is sent to the terminal device in a multicast (multicast) transmission mode.
  • different access network devices will independently determine the sequence numbers of the MBMS service data packets when sending MBMS service data packets to the terminal devices within their coverage.
  • the terminal device moves from the source access network device to the target access network device, in order to continue to receive the MBMS service, it needs to continue to receive the MBMS service originally received by the source access network device after switching to the target access network device.
  • the progress of the MBMS service sent by the two access network devices may be inconsistent, and the source access network device and the target access network device are independent of each other when determining the sequence number of the MBMS service data packet, the terminal device is in the handover process.
  • the source access network equipment and the target access network equipment will have inconsistent understanding of the MBMS service data packet sequence number, which will cause the terminal equipment to receive the MBMS service interruption or receive redundant data packets before and after the handover. Ensure the continuity of MBMS business.
  • This application provides a communication method, access network equipment, terminal equipment, and core network equipment.
  • the communication method avoids that in the prior art, for terminal equipment receiving MBMS services, when switching across access network equipment, Inconsistent multicast service progress of different access network equipment causes redundant reception of data packets by terminal equipment or interruption of service data.
  • a communication method which is applied to a first access network device, and is characterized in that it includes:
  • first indication information is used to indicate the order of the first data packet in at least one data packet; determining the first data packet according to the first indication information The first sequence number of the first protocol layer of the first data packet; sending the first data packet to the terminal device.
  • the second access network device can learn from the sequence number of the data packet forwarded by the first access network device
  • the first service progress of the first access network device does not need to introduce additional progress interaction information between the two access network devices.
  • the first indication information includes at least one of the following information: General Packet Radio Service Tunneling Protocol-User Plane GTP-U sequence number, first service sequence Number;
  • the first service serial number is set by the core network device or the data server, the first data packet is a data packet of the first service, and the at least one data packet is a data packet of the first service.
  • the first protocol layer includes at least one of the following: a service data adaptation protocol SDAP layer, a packet data convergence protocol PDCP layer, and a radio link control layer protocol RLC Floor.
  • the method further includes: any one of when the first protocol entity is newly created, the first protocol entity is rebuilt, and the first protocol entity is restored When the situation occurs, the starting sequence number of the first protocol layer of the first data packet is set according to the first indication information.
  • the first access network device when the first access network device establishes the first protocol entity, rebuilds the first protocol entity, and restores the first protocol entity, when any one of the conditions occurs, the first access network device sets the first protocol entity according to the first indication information.
  • the initial sequence number of the first protocol layer of the first data packet ensures the continuity of the first service data packet, and the setting of the initial sequence number of the first protocol layer will not cause the first Disorder of a business data packet.
  • the method further includes: sending second instruction information to the terminal device, where the second instruction information is used to instruct to create a new protocol entity in the first protocol entity. Or after the first protocol entity is rebuilt or the first protocol entity is restored, the sequence number of the first data packet belonging to the first service sent by the first access network device to the terminal device.
  • the terminal device can determine the start sequence number of the first protocol layer of the first received data packet according to the second indication information, which prevents the first terminal device and the first access network The device determines the packet loss caused by the inconsistency of the first packet.
  • the method further includes: receiving third indication information from a second access network device, where the third indication information is used to indicate the first access
  • the network access device stops forwarding the data packet to the second access network device; according to the third instruction information, it stops forwarding the data packet to the second access network device.
  • the second access network device determines whether the data forwarding of the first access network device can be stopped, and sends the data to the first access network device. Forwarding the stop instruction information can ensure the continuity of the terminal receiving the multicast service during the handover process, and avoid packet loss or redundant transmission.
  • the method further includes: receiving fourth indication information sent by the second access network device, where the fourth indication information is used to indicate the second The sequence number of the first data packet forwarded by an access network device to the second access network device; and forwarding the data packet to the second access network device according to the fourth indication information.
  • the fourth indication information indicates the sequence number of the first protocol layer of the first data packet not received by the first terminal device, that is, the initial data packet for data forwarding by the first access network device, so This can prevent the first terminal device from receiving redundant data packets, that is, although the data packets sent by the first access network device are successfully received by the first terminal device, they are still forwarded by the first access network device To the second access network device, and then sent by the second access network device to the first terminal device.
  • the method further includes: receiving fifth indication information sent by a second access network device, where the fifth indication information includes a second sequence number N, so The second sequence number is used to indicate the sequence number of the first data packet belonging to the first service sent by the second access network device to the terminal device after the terminal device is switched.
  • the protocol layer sequence number corresponding to the data packet successfully sent by an access network device to the terminal device is N-1, the first access network device stops sending the data packet to the terminal device.
  • the first access network device determines when to stop the connection of the terminal device according to the SN indicated by the second access network device, which can ensure that the terminal device receives multicast during the handover process.
  • the continuity of business avoids packet loss or redundant transmission.
  • the first access network device sends stop instruction information to the second access network device to instruct the first access network device to communicate with the The first terminal device is disconnected.
  • the second access network device sends fifth indication information to the first access network device, where the fifth indication information includes a second sequence number N-1, the second sequence number is used to indicate that the first protocol layer sequence number of the data packet successfully sent by the first access network device to the terminal device is N-1, the first access The network device stops sending data packets to the terminal device.
  • a communication method is provided.
  • the method is applied to a terminal device, and includes: receiving second indication information from a first access network device, where the second indication information is used to indicate that the first protocol The sequence number of the first data packet belonging to the first service sent by the first access network device to the terminal device after the entity is newly created or the first protocol entity is rebuilt or the first protocol entity is restored.
  • the method further includes: when the first protocol entity is rebuilt or restored, sending request information to the first access network device, and the request information is used After requesting the first access network device to send the first service-related first service sent by the first access network device to the terminal device after the first protocol entity is rebuilt or the first protocol entity is restored The sequence number of each packet.
  • the method further includes: sending status report information of the data packet to the second access network device, where the status report information of the data packet is used to indicate the The second access network device, the data packet successfully received by the terminal device and the data packet not successfully received, wherein the terminal device is switched from the first access network device to the second access network equipment.
  • a communication method which is applied to a second access network device, and includes: receiving a first data packet from a core network device and first indication information, where the first indication information is used to indicate The sequence of the first data packet in at least one data packet; determining the second sequence number of the first protocol layer of the first data packet according to the first indication information;
  • the first indication information includes at least one of the following information: General Packet Radio Service Tunneling Protocol-User Plane GTP-U serial number, first service serial number
  • the first service serial number is set by the core network device or the data server, the first data packet is a data packet of the first service, and the at least one data packet is a data packet of the first service.
  • the first protocol layer includes at least one of the following:
  • the method further includes: any one of when the first protocol entity is newly created, the first protocol entity is rebuilt, and the first protocol entity is restored When the situation occurs, the starting sequence number of the first protocol layer of the first data packet is set according to the first indication information.
  • the method further includes: sending second indication information to the terminal device, where the second indication information is used to instruct to create a new protocol entity in the first protocol entity. Or after the first protocol entity is rebuilt or the first protocol entity is restored, the sequence number of the first data packet belonging to the first service sent by the first access network device to the terminal device.
  • the method further includes: receiving a data packet from a first access network device, wherein the second terminal device in the first access network device The first access network device is switched to the second access network device, the first terminal device and the second terminal device both perform the first service, and the first access network device sends The data packet of is the data packet of the first service; the second sequence number of the first protocol layer of the data packet currently being sent to the first terminal device is equal to or greater than the data sent by the first access network device The first protocol layer first sequence number of the packet, send third indication information to the first access network device, where the third indication information is used to instruct the first access network device to stop sending the message to the second access network device.
  • the access network device forwards the data packet.
  • the method further includes: receiving status report information of a data packet from the second terminal device, where the status report information of the data packet is used to indicate all In the second access network device, data packets successfully received by the terminal device and data packets not successfully received; according to the status report information, fourth indication information is sent to the first access network device, The fourth indication information is used to indicate the sequence number of the first data packet forwarded by the first access network device to the second access network device.
  • the method further includes: sending fifth indication information to the first access network device, where the fifth indication information includes a second sequence number N, and the The second sequence number is used to indicate the sequence number of the first data packet belonging to the first service sent by the second access network device to the second terminal device after the handover of the second terminal device is completed.
  • a communication method is provided.
  • the method is applied to a core network device and includes: receiving a first data packet sent by a data server; sending a second data packet and first indication information to the first access network device,
  • the first indication information is used to indicate the order of the second data packet in at least one data packet sent by the core network device; sending the third data packet and the second indication information to the second access network device, the first An indication information is used to indicate the sequence of the third data packet in at least one data packet of the core network device, and the data of the second data packet and the data of the third data packet are the same as those of the first data packet.
  • the data is the same.
  • the first indication information includes at least one of the following information: General Packet Radio Service Tunneling Protocol-User Plane GTP-U sequence number, first service sequence Number;
  • the first service serial number is set by the core network device or the data server, the first data packet is a data packet of the first service, and the at least one data packet is a data packet of the first service.
  • an access network device may be a first access network device, a chip or module in the first access network device, or a chip or a system-on-chip ,
  • the access network device includes: a transceiving unit, configured to receive a first data packet from a core network device and first indication information, where the first indication information is used to indicate that the first data packet is in at least one The sequence in the data packet; a processing unit, configured to determine the first sequence number of the first protocol layer of the first data packet according to the first indication information; the transceiving unit, further configured to transfer the first data The packet is sent to the terminal device.
  • the first indication information includes at least one of the following information: General Packet Radio Service Tunneling Protocol-User Plane GTP-U sequence number, first service sequence Number; the first serial number of the first service is set by the core network device or data server, the first data packet is a data packet of the first service, and the at least one data packet is data of the first service Bag.
  • the first protocol layer includes at least one of the following: a service data adaptation protocol SDAP layer, a packet data convergence protocol PDCP layer, and a radio link control layer protocol RLC Floor.
  • the processing unit is further configured to: when the first protocol entity is newly created, the first protocol entity is rebuilt, and the first protocol entity is restored When any situation occurs, determine the starting sequence number of the first protocol layer of the first data packet according to the first indication information.
  • the transceiver unit is further configured to: send second indication information to the terminal device, where the second indication information is used to indicate that the The sequence number of the first data packet belonging to the first service sent by the first access network device to the terminal device after the entity is newly created or the first protocol entity is rebuilt or the first protocol entity is restored.
  • the transceiver unit is further configured to: receive third indication information from a second access network device, where the third indication information is used to indicate the second An access network device stops forwarding data packets to the second access network device; the processing unit is configured to stop forwarding data packets to the second access network device according to the third instruction information.
  • the transceiving unit is further configured to: receive fourth indication information sent by the second access network device, where the fourth indication information is used to indicate the The sequence number of the first data packet forwarded by the first access network device to the second access network device; the processing unit is configured to forward to the second access network device according to the fourth instruction information data pack.
  • the transceiver unit is further configured to: receive fifth indication information sent by the second access network device, where the fifth indication information includes the second sequence number N ,
  • the second sequence number is used to indicate the sequence number of the first data packet belonging to the first service sent by the second access network device to the terminal device after the terminal device is switched
  • the The processing unit is configured to determine that when the protocol layer sequence number corresponding to the data packet successfully sent by the first access network device to the terminal device is N-1, stop sending the data packet to the terminal device.
  • a terminal device may be a terminal device, a chip or module in the terminal device, or a chip or a system-on-chip.
  • the terminal device includes: a transceiver unit for Receive second indication information sent by the first access network device, where the second indication information is used to indicate that after the first protocol entity is newly created or the first protocol entity is rebuilt or the first protocol entity is restored, The sequence number of the first data packet belonging to the first service sent by the first access network device to the terminal device.
  • the transceiving unit is further configured to: when the first protocol entity is rebuilt or restored, send request information to the first access network device, the request The information is used to request the first access network device to send the first service sent by the first access network device to the terminal device after the first protocol entity is rebuilt or the first protocol entity is restored The sequence number of the first packet.
  • the transceiving unit is further configured to: send status report information of the data packet to the second access network device, where the status report information of the data packet is used to indicate The second access network device, the data packets successfully received by the terminal device and the data packets that are not successfully received, wherein the terminal device is switched from the first access network device to the second access device Connected to the network equipment.
  • an access network device may be a second access network device, a chip or module in the second access network device, or a chip or a system on a chip.
  • the access network device includes: a transceiving unit, configured to receive a first data packet and first indication information from a core network device, the first indication information being used to indicate that the first data packet is in at least one data packet
  • the processing unit is configured to determine the second sequence number of the first protocol layer of the first data packet according to the first indication information; the transceiving unit is configured to send the first data packet to the first One terminal equipment.
  • the first indication information includes at least one of the following information: General Packet Radio Service Tunneling Protocol-User Plane GTP-U serial number, first service serial number
  • the first service serial number is set by the core network device or the data server, the first data packet is a data packet of the first service, and the at least one data packet is a data packet of the first service.
  • the first protocol layer includes at least one of the following: a service data adaptation protocol SDAP layer, a packet data convergence protocol PDCP layer, and a radio link control layer protocol RLC Floor.
  • the processing unit is further configured to: when the first protocol entity is newly created, the first protocol entity is rebuilt, and the first protocol entity is restored When any situation occurs, the starting sequence number of the first protocol layer of the first data packet is set according to the first indication information.
  • the transceiver unit is further configured to: send second indication information to the terminal device, where the second indication information is used to indicate that the The sequence number of the first data packet belonging to the first service sent by the first access network device to the terminal device after the entity is newly created or the first protocol entity is rebuilt or the first protocol entity is restored.
  • the transceiving unit is further configured to: receive a data packet sent by a first access network device, wherein the second access network device in the first access network device The terminal device is switched from the first access network device to the second access network device, the first terminal device and the second terminal device both perform the first service, and the first access network device
  • the data packet sent by the device is the data packet of the first service; the second sequence number of the first protocol layer of the data packet currently being sent to the first terminal device is equal to or greater than that sent by the first access network device When the first sequence number of the first protocol layer of the data packet in the The second access network device forwards the data packet.
  • the transceiver unit is further configured to: receive status report information of a data packet sent by the second terminal device, where the status report information of the data packet is used for Instruct the second access network device, data packets successfully received by the terminal device and data packets that have not been successfully received; send fourth instruction information to the first access network device according to the status report information, The fourth indication information is used to indicate the sequence number of the first data packet forwarded by the first access network device to the second access network device.
  • the transceiving unit is further configured to: send fifth indication information to the first access network device, where the fifth indication information includes the second sequence number N,
  • the second sequence number is used to indicate the sequence number of the first data packet belonging to the first service sent by the second access network device to the second terminal device after the handover of the second terminal device is completed .
  • a core network device may be a core network device, a chip or module in a core network device, or a chip or a system-on-chip.
  • the core network device includes: The transceiving unit is configured to receive a first data packet sent by the data server; the transceiving unit is configured to send a second data packet and first indication information to the first access network device, and the first indication information is used to indicate the The sequence of the second data packet in at least one data packet sent by the core network device; the transceiving unit is used for sending the third data packet and the second indication information to the second access network device, and the first indication information is used for Indicate the sequence of the third data packet in at least one data packet sent by the core network device, and the data of the second data packet and the data of the third data packet are the same as the data of the first data packet.
  • the first indication information includes at least one of the following information: General Packet Radio Service Tunneling Protocol-User Plane GTP-U serial number, first service serial number
  • the first service serial number is set by the core network device or the data server, the first data packet is a data packet of the first service, and the at least one data packet is a data packet of the first service.
  • a communication device including a processor, the processor is connected to a memory, the memory is configured to store a computer program, and the processor is configured to execute the computer program stored in the memory to enable
  • the device executes the method in any possible implementation manner of the first aspect or the first aspect, or the method in any possible implementation manner of the second aspect or the second aspect, or any possibility of the third aspect or the third aspect Or the method in the fourth aspect or any possible implementation of the fourth aspect.
  • a computer-readable storage medium stores a computer program, and when the computer program is executed, the first aspect or any possible implementation manner of the first aspect is implemented.
  • a chip which is characterized by comprising a processor and an interface; the processor is configured to read instructions to execute the above-mentioned first aspect or any possible implementation method of the first aspect, or The method in any possible implementation of the second aspect or the second aspect, or in any possible implementation of the third aspect or the third aspect, or in any possible implementation of the fourth aspect or the fourth aspect Methods.
  • the chip may also include a memory in which instructions are stored, and the processor is used to execute instructions stored in the memory or instructions derived from other sources.
  • a communication system in a twelfth aspect, includes a device capable of implementing the methods and various possible designs of the above-mentioned first aspect, and a device capable of implementing the various methods and various possible designs of the above-mentioned second aspect.
  • Fig. 1 is a schematic diagram of an application scenario of an embodiment of the present application.
  • Fig. 2 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • Fig. 3 is a schematic flowchart of a method for handover of terminal equipment across access network equipment in the prior art.
  • Fig. 4 is a schematic diagram of an application scenario of a multicast service according to an embodiment of the present application.
  • Fig. 5 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of data forwarding in a communication method according to an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • Fig. 8 is a schematic block diagram of a communication device according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a terminal device provided by this application.
  • FIG. 10 is a schematic structural diagram of an access network device provided by this application.
  • GSM global system for mobile communications
  • CDMA code division multiple access
  • WCDMA broadband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • LTE frequency division duplex FDD
  • TDD LTE Time division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • 5G fifth generation
  • the system or new radio (NR) can also be applied to the use of subsequent evolutionary systems, such as the sixth-generation 6G communication system, and even the higher-level seventh-generation 7G communication system.
  • the terminal equipment in the embodiments of this application may also be referred to as: user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, Mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.
  • UE user equipment
  • MS mobile station
  • MT mobile terminal
  • access terminal user unit, user station, Mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.
  • the terminal device may be a wireless terminal or a wired terminal.
  • the wireless terminal may be a device that provides voice and/or other service data connectivity to users, a handheld device with wireless connection function, or other processing devices connected to a wireless modem.
  • a wireless terminal can communicate with one or more core networks via a radio access network (RAN).
  • the wireless terminal can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal For example, they can be portable, pocket-sized, handheld, computer-built or vehicle-mounted mobile devices that exchange language and/or data with the wireless access network.
  • PCS personal communication service
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • Wireless terminals can also be called systems, subscriber units (Subscriber Unit), subscriber stations (Subscriber Station), mobile stations (Mobile Station), mobile stations (Mobile), remote stations (Remote Station), remote terminals (Remote Terminal), Access terminal (Access Terminal), user terminal (User Terminal), user agent (User Agent), user equipment (User Device or User Equipment), mobile Internet device (mobile internet device, MID), wearable device, virtual reality (virtual) Reality, VR) equipment, augmented reality (AR) equipment, wireless terminals in industrial control, wireless terminals in self-driving, and wireless terminals in remote medical surgery , Wireless terminals in smart grid, wireless terminals in transportation safety, wireless terminals in smart city, wireless terminals in smart home (smart home), in-vehicle devices, wearables A device, a terminal device in a 5G network or a terminal device in a public land mobile network (PLMN) that will evolve in the future, etc., which are not limited in the embodiment of the present application.
  • PLMN public land
  • wearable devices can also be referred to as wearable smart devices. It is a general term for using wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, Gloves, watches, clothing and shoes, etc.
  • a wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. Wearable devices are not only a kind of hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones.
  • the terminal device may also be a terminal device in the Internet of Things (IoT) system.
  • IoT Internet of Things
  • Its main technical feature is to pass items through communication technology. Connect with the network to realize the intelligent network of human-machine interconnection and interconnection of things.
  • the various terminal devices introduced above if they are located on the vehicle (for example, placed in the vehicle or installed in the vehicle), can be considered as vehicle-mounted terminal equipment, for example, the vehicle-mounted terminal equipment is also called on-board unit (OBU). ).
  • OBU on-board unit
  • the terminal device may also include a relay. Or it can be understood that everything that can communicate with the base station can be regarded as a terminal device.
  • the access network equipment in the embodiments of the present application may be equipment used to communicate with terminal equipment, may be a base station, or an access point, or a network equipment, or may refer to the access network through one or more devices on the air interface.
  • Each sector is a device that communicates with the wireless terminal.
  • the network device can be used to convert received air frames and IP packets into each other, and act as a router between the wireless terminal and the rest of the access network, where the rest of the access network can include an Internet Protocol (IP) network.
  • IP Internet Protocol
  • the network equipment can also coordinate the attribute management of the air interface.
  • the access network equipment can be a base station (BTS) in Global System of Mobile Communications (GSM) or Code Division Multiple Access (CDMA), or it can be a broadband code division.
  • GSM Global System of Mobile Communications
  • CDMA Code Division Multiple Access
  • the base station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA) can also be an evolved NodeB (eNB or eNodeB) in an LTE system, or it can be a cloud radio access network (cloud radio).
  • the wireless controller in the access network, CRAN) scenario, or the access device can be a relay station, access point, in-vehicle device, wearable device, and access device in a 5G network or a network device in a future evolved PLMN network, etc. It may be an access point (access point, AP) in a WLAN, or a gNB in a new radio system (new radio, NR) system, and this embodiment of the application is not limited.
  • a network device can also be divided into a control unit (Control Unit, CU) and a data unit (Data Unit, DU). Under a CU, there can be multiple DUs, where each DU and terminal are The measurement report method described in the embodiment of the present application can be used.
  • the difference between the CU-DU separation scenario and the multi-TRP scenario is that the TRP is only a radio frequency unit or an antenna device, and the DU can implement the protocol stack function, for example, the DU can implement the physical layer function.
  • the access network device is a device in an access network (radio access network, RAN), or in other words, a RAN node that connects a terminal device to a wireless network.
  • RAN radio access network
  • the access network device can include: gNB, transmission reception point (TRP), evolved Node B (eNB), radio network controller (radio network controller) , RNC), Node B (Node B, NB), base station controller (BSC), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home Node B, HNB) ), baseband unit (BBU), or wireless fidelity (Wifi) access point (AP), etc.
  • TRP transmission reception point
  • eNB evolved Node B
  • RNC radio network controller
  • Node B Node B
  • BSC base station controller
  • BTS base transceiver station
  • BTS home base station
  • BBU baseband unit
  • Wifi wireless fidelity
  • the access network equipment provides services for the cell, and the terminal equipment communicates with the access network equipment through the transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell.
  • the cell may be an access network equipment (for example, a base station). ) Corresponding cell.
  • the cell can belong to a macro base station or a base station corresponding to a small cell.
  • the small cell here can include: metro cell, micro cell, pico cell ), femto cells, etc. These small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high-rate data transmission services.
  • Unicast A point-to-point communication technology, that is, a single point of communication between a network device and a terminal device.
  • the network device can send data separately for each terminal device.
  • Unicast can also be called unicast transmission mode or unicast transmission technology.
  • Sending by unicast transmission means when the sending device sends the transport block (TB) corresponding to the protocol data unit (protocol data unit, PDU), the cell network temporary identifier (C-RNTI) is used.
  • TB transport block
  • PDU protocol data unit
  • C-RNTI cell network temporary identifier
  • a receiving device receives the same PDU according to the C-RNTI; or the unicast transmission of the PDU may refer to the PDU Transmission is carried out in a radio bearer established for unicast transmission or in a channel specially designed for unicast transmission.
  • Receiving in the unicast transmission mode means that when the unicast transmission is used, the receiving device receives the PDU according to the C-RNTI; or the receiving device receives the PDU through a radio bearer established for unicast transmission or is used for unicast transmission. Receive on the transmitted channel.
  • Multicast Point-to-multipoint communication technology, which can also be called multicast transmission method or multicast transmission technology, used to serve multimedia broadcast multicast services. Multicast can also be called multicast, and can also be called a broadcast technology in some broad scenarios, but there are differences between multicast and traditional broadcast technology.
  • the multicast transmission mode is adopted, for the same data, multiple terminal devices simultaneously receive the same data during the transmission process of the network device (for example, the base station).
  • MBSFN multimedia broadcast multicast multicast service single frequency network
  • SC-PTM single cell point to multipoint service
  • other multicast transmission technologies are also being discussed, and the present invention is not limited.
  • Sending by multicast transmission means when the sending device sends the transport block (TB) corresponding to the protocol data unit (protocol data unit, PDU), it uses the group radio network temporary identifier (G-RNTI) ) Scramble the PDU, or scramble the downlink control information (DCI) corresponding to the PDU, and one or more receiving devices receive the same PDU according to the same G-RNTI.
  • G-RNTI group radio network temporary identifier
  • transmitting the PDU in a multicast manner may refer to informing multiple receiving devices of the location of the same PDU in a semi-static manner, and multiple receiving devices can receive the PDU at the same time.
  • the use of multicast to transmit the PDU may mean that the PDU is transmitted in a radio bearer established for multicast transmission or transmitted in a channel specially designed for multicast.
  • Receiving by multicast transmission means that when the opposite side uses multicast transmission, one of the multiple receiving devices receives the PDU according to the G-RNTI; or one of the multiple receiving devices receives the PDU according to G-RNTI;
  • the radio bearer established by the multicast transmission receives or receives PDUs on the channel used for the multicast transmission.
  • Broadcast Point-to-multipoint communication technology. Different from multicast, the technology involved in broadcasting is that the sending device sends the TB corresponding to the PDU on the broadcast channel, and all receiving devices can receive the PDU on the broadcast channel. Different from the multicast technology, in traditional broadcast transmission, the broadcast channel does not use the above-mentioned G-RNTI scrambling method.
  • Handover Switching an ongoing call from one wireless channel to another wireless channel to ensure uninterrupted communication.
  • each cell covers a limited range. Therefore, when a terminal device moves from the current serving cell to an adjacent cell, in order to ensure service continuity, the network side needs to switch the service to the adjacent cell without interruption Communication process.
  • Handover refers to the process of switching the link carrying communication data from one cell (or base station) to another cell (or base station) in order to ensure uninterrupted communication during the communication process.
  • the control plane protocol layer structure can include the radio resource control (RRC) layer, the Packet Data Convergence Protocol (PDCP) layer, the radio link control (RLC) layer, and the media interface. Access control (media access control, MAC) and physical layer, etc.
  • the user plane protocol layer structure may include the PDCP layer, the RLC layer, the MAC layer, and the physical layer. Among them, the physical layer is located at the lowest layer (layer one), the MAC layer, RLC, and PDCP belong to the second layer (layer two), and the RRC belongs to the third layer (layer three).
  • the PDCP layer may also include a service data adaptation protocol (SDAP) layer.
  • SDAP service data adaptation protocol
  • TCP/IP Transmission Control Protocol/Internet Protocol
  • the radio access network device can include a centralized unit (CU) and a distributed unit (CU).
  • CU distributed unit
  • multiple DUs can be centrally controlled by one CU.
  • CU and DU can be divided according to the protocol layer of the wireless network. For example, the functions of the PDCP layer and above are set in the CU, the protocol layers below the PDCP, and the functions of the RLC layer and MAC layer are set in the DU.
  • protocol layers is just an example, and it can also be divided in other protocol layers, for example, in the RLC layer.
  • the functions of the RLC layer and above protocol layers are set in the CU, and the protocol layers below the RLC layer
  • the functions are set in the DU; or, divided in a certain protocol layer, for example, part of the functions of the RLC layer and the functions of the protocol layer above the RLC layer are set in the CU, and the remaining functions of the RLC layer and the functions of the protocol layer below the RLC layer Set in DU.
  • it can also be divided in other ways, for example, by time delay.
  • the functions that need to meet the delay requirement for processing time are set in the DU, and the functions that do not need to meet the delay requirement are set in the CU.
  • Radio Bearer Generally, it can be understood as a transmission path or treatment that a data packet or signaling passes through when it is transmitted on an air interface.
  • Radio bearers include data radio bearers and signaling radio bearers.
  • the radio bearer is established and configured through the RRC signaling of the network equipment.
  • the configuration of the radio bearer includes the configuration of each protocol layer.
  • the entities of each protocol layer of the network equipment and terminal equipment perform data packets in the radio bearer according to the configuration. Or the sending, receiving or processing of signaling.
  • a radio bearer can be understood as a transmission channel. Whether on the terminal device side or on the network device side, each radio bearer contains a PDCP entity and at least one RLC entity to perform data packets transmitted in the radio bearer. deal with.
  • network equipment can also add, modify, or delete (release) radio bearers through RRC signaling.
  • Multimedia broadcast multicast service is a one-way multimedia service used for point-to-multipoint. For example, on the air interface, a multimedia broadcast service is sent to users in a cell through a common channel, or a multicast service subscribed by a user is sent to users in a cell in a multicast manner, thereby saving air interface resources.
  • FIG. 1 shows a schematic diagram of an application scenario 100 of an embodiment of the present application.
  • 1 includes an access network device 110, a terminal device 120, a terminal device 130, a terminal device 140, a terminal device 150, a terminal device 160, and a terminal device 170.
  • the access network device 110 for example, works in an evolved universal mobile communication system terrestrial radio access (evolved UMTS terrestrial radio access, E-UTRA) system, or works in an NR system, or works in a next-generation communication system or In other communication systems, the access network device 110 and the terminal device 120 to the terminal device 170 may communicate through a Uu interface.
  • E-UTRA evolved universal mobile communication system terrestrial radio access
  • the terminal device 120 to the terminal device 170 can send uplink data to the access network device 110, and the access network device 110 can send the downlink data to the terminal device 120 to the terminal device 170.
  • the terminal device 150 to the terminal device 170 may also form a communication system.
  • the access network device 110 can send downlink data to the terminal device 120 to the terminal device 150.
  • the access network device 110 sends the downlink data to the terminal device 120 and the terminal device 150 in unicast mode, and the access network device 110 uses multicast mode.
  • Send downlink data to the terminal device 130 and the terminal device 140, and the terminal device 150 may also send the downlink data to the terminal device 160 and the terminal device 170.
  • the access network device in FIG. 1 is, for example, a base station.
  • the access network equipment corresponds to different equipment in different systems.
  • a 4G system it can correspond to an eNB
  • a 5G system it corresponds to an access network equipment in 5G, such as gNB.
  • the technical solutions provided by the embodiments of the present application can also be applied to future mobile communication systems. Therefore, the access network equipment in FIG. 1 can also correspond to the access network equipment in the future mobile communication system.
  • Figure 1 takes the access network equipment as a base station as an example. In fact, the access network equipment can refer to the previous introduction.
  • the communication system shown in FIG. 1 may also include more network nodes, such as other terminal equipment or access network equipment, and the access network equipment or terminal equipment included in the communication system shown in FIG. 1 may be the aforementioned Various forms of access network equipment or terminal equipment.
  • the embodiments of the present application are not shown one by one in the figure.
  • this application can also be used in other communication systems, as long as the communication system needs to indicate the direction of transmission.
  • this application is not only applicable to scenarios where one access network device has multiple UEs (e.g. SC-PTM scenario), but also applicable to scenarios where multiple access network devices cooperate and perform data communication with multiple UEs at the same time (e.g. MBSFN scenario).
  • MBSFN scenario multiple access network devices cooperate and perform data communication with multiple UEs at the same time
  • FIG. 2 is a schematic flowchart of a communication method 200 according to an embodiment of the present application.
  • the method 200 can be applied in the scenario shown in FIG. It can be applied to other communication scenarios, and the embodiments of the present application are not limited herein.
  • the terminal device, the access network device, and the core network device are taken as an example of the execution subject of the execution method to describe the method.
  • the execution subject of the execution method may also be a chip, a chip system, or a processor applied to a terminal device, an access network device, and a core network device.
  • the method 200 shown in FIG. 2 may include S201 to S210. Each step in the method 200 will be described in detail below with reference to FIG. 2.
  • the data server sends at least one data packet of the first service to the core network device.
  • the data server when the data server sends at least one data packet of the first service to the core network device, it may carry progress indication information of the first service, and the progress indication information is used to indicate that the current data packet is in the first service.
  • the location in at least one data packet, and the progress indication information of the first service may be the serial number of the first service.
  • the progress indication information may be carried in the data packet, for example, in the packet header, or the indication information may be sent separately from the data packet.
  • the data server receives request information sent by the core network device, and the request information is used to request the data server to carry the first service when sending at least one data packet of the first service to the core network device.
  • the data server receives the request information sent by the core network device and sends at least one data packet of the first service to the core network device, each data packet may carry the progress indication information of the first service .
  • the first service may be an MBMS service.
  • S202 The core network device receives at least one data packet of the first service sent by the data server.
  • the core network device when the core network device receives at least one data packet of the first service sent by the data server, it will determine the access network device that needs to receive the first service, so that the at least one data packet is sent to different The access network equipment sent.
  • the core network device sends a first data packet and first indication information to the first access network device, where the first indication information is used to indicate that the first data packet is in at least one data packet sent by the core network device. order.
  • S201 and S202 are only used as optional steps, and S203 is not limited to rely on S201 and S202.
  • the data packets received by the specific core network device may be received from other places. Or generated by yourself, optionally, you can also receive progress indication information from other places, and determine the order of each data packet according to the progress indication information. In addition, it does not limit how the core network sends data packets to different access network devices.
  • the core network device sends a second data packet and second indication information to the second access network device, where the first indication information is used to indicate that the second data packet is in at least one data packet sent by the core network device.
  • the data of the first data packet and the data of the second data packet can be the same or different. There is no restriction on this.
  • the first indication information is the same as the second indication information.
  • the core network device sends 5 data packets with core network serial numbers 1-5 to the first access network device, and 5 data packets with core network serial numbers 5-9 to the second access network device ,
  • the last of the 5 data packets received by the first access network device has the same content and size as the first of the 5 data packets received by the second access network device.
  • the instructions corresponding to the two data packets are the same.
  • the first indication information may be carried, and the first indication The information can be realized by setting the core network serial number for the data packet.
  • the core network device sends data packets received from the data server to different access network devices, for the same data packet (with the same content or load), make it carry the same core network serial number, that is, the same first Indication information, where the first indication information is used to identify the position of the data packet in at least one data packet sent.
  • the first indication information includes at least one of the following information: General Packet Radio Service Tunneling Protocol-User Plane Sequence Number (GPRS Tunneling Protocol-U Sequence Number, GTP-U), and the first service sequence number; where The first service serial number is set by the core network device or the data server, the first data packet is a data packet of the first service, and the at least one data packet is a data packet of the first service.
  • GPRS Tunneling Protocol-U Sequence Number GTP-U
  • the first service serial number is set by the core network device or the data server, the first data packet is a data packet of the first service, and the at least one data packet is a data packet of the first service.
  • the core network equipment and different access network equipment establish different PDU sessions or GTP tunnels to operate independently, so even if the core network equipment receives the same data packet from the data server When sending to different access network devices, different GTP-U SN numbers may also be set.
  • the core network device sets the same GTP-U SN number when sending to different access network devices.
  • each data packet sets the GTP-U SN number according to the instructions of the data server. In this way, because the GTP-U SN number is associated with the content of the data packet, different access network devices can be based on the GTP-U SN number. SN number to judge the progress of the service transmission.
  • the core network device may connect to the core network device according to the first service serial number.
  • the network access device sends first indication information, where the first indication information may be the first service serial number carried in the at least one data packet. If the data server does not carry the first service serial number when sending at least one data packet of the first service to the core network device, the core network device resets the first data packet of the at least one data packet according to the order in which the at least one data packet is received.
  • Service sequence number for example, when the core network device receives data packet 1, data packet 2, and data packet 3 from the data server, the first service sequence number 1 can be set for data packet 1, and the first service sequence number 2 for data packet 2. Set the first service sequence number 3 to the data packet 3.
  • the first access network device receives the first data packet and the first indication information from the core network device.
  • S205 depends on the specific implementation of the previous steps, and it only needs to receive the first data packet and the first indication information from the core network device.
  • the first access network device determines the first sequence number of the first protocol layer of the first data packet according to the first indication information.
  • the first protocol layer includes at least one of the following protocol layers: a service data adaptation protocol SDAP layer, a packet data convergence protocol PDCP layer, and a radio link control layer protocol RLC layer.
  • the first protocol layer may be a high-level protocol layer on the radio access network side, and the first protocol layer may also be referred to as a layer two protocol layer.
  • SDAP, PDCP, RLC, and MAC all belong to layer two protocols.
  • a new protocol layer may be introduced for new functions in subsequent technologies. Therefore, this embodiment does not limit the first protocol layer to be an existing protocol layer, but may also be a newly defined protocol layer.
  • the first access network device determines the first sequence number of the first protocol layer of the first data packet according to the first indication information, and the first sequence number of the first protocol layer A sequence number is used by the first protocol layer to process the first data packet, such as sorting and duplicate detection.
  • the first protocol layer entity of the first access network device determines the starting sequence number of the first data packet according to the first indication information.
  • the first indication information of the first data packet received by the access network device for example, when the first indication information is the core network sequence number, The core network sequence number corresponding to the first data packet is 5, and the access network device also sets the PDCP sequence number of the first data packet to 5 instead of starting from 0 in the prior art. Even if the first protocol layer entity is rebuilt or restored, it can be guaranteed that the information corresponding to the data packet is the current actual business progress information.
  • the second access network device receives the second data packet and the first indication information from the core network device.
  • the second access network device determines the second sequence number of the first protocol layer of the second data packet according to the first indication information.
  • step S206 and step S208 after the first access network device and the second access network device receive the data packet sent by the core network device and the core network serial number, they need to determine the sequence of the received data packet No. In order to understand this step more clearly, it will be briefly described below in conjunction with FIG. 6.
  • the first access network device receives the first data packet whose core network serial number GTP-U SN is 8, and the first access network device determines the PDCP SN of the first data packet according to the GTP-U SN of the first data packet Is 8; the second access network device receives the data packet with the core network serial number GTP-U SN being 11, and the second access network device determines the second data packet according to the GTP-U SN of the second data packet being 11 PDCP SN is 11.
  • PDCP is an example of the first protocol layer.
  • the second access network device may also be the first access network device.
  • the second access network device reference may be made to the above description of the first access network device. Go into details.
  • the core network device sends the same first service to the first access network device and the second access network device, and carries the same first indication information for data packets with the same content, so that the first access
  • the network device and the second access network device can determine the same serial number of the first protocol layer according to the same first indication information for data packets of the same content, that is, the data packets of the same data are determined by different access network devices.
  • the serial numbers of a protocol layer are the same. Therefore, in the process that the terminal device is handed over from the first access network device to the second access network device, the second access network device can learn the information according to the SN status forwarding and data forwarding steps in the existing handover procedure.
  • the first service progress of the first access network device without introducing additional progress interaction information between the two access network devices.
  • each protocol layer of the data server, core network device, access network device, and terminal device may set a serial number belonging to each protocol layer, for example, the core network serial number is the core network device The serial number set for the data packet, and the PDCP serial number is the serial number set for the data packet by the PDCP layer of the access network device or the terminal device.
  • Different sequence numbers are located in different packets of the same data packet, have different functions, and are only visible to the corresponding device or protocol layer.
  • the "serial number" is a collective term for all serial numbers, and is not limited to which kind of serial number. It needs to be specifically determined according to the scenario.
  • the serial number of the PDCP layer is the PDCP serial number.
  • a data packet sent from the core network device to the access network device and then to the terminal device will go through many different protocol layers (such as increasing the header of the data packet). These processing are for transmission needs. After processing, the size or form of the data packet may change, but as long as the content of the load of the data packet does not change, it can be said to be the same data packet, such as the first data packet.
  • S209 The first access network device sends the first data packet to the first terminal device.
  • the first access network device may send second indication information to the first terminal device, where the second indication information is used to indicate that the first protocol entity of the first terminal device is newly established or the first protocol entity The sequence number of the first data packet of the first service sent by the first access network device to the first terminal device after the reconstruction occurs or the data recovery of the first protocol entity occurs.
  • the first terminal device before the first terminal device starts to receive the first service, when the first protocol entity is newly created, it first obtains the configuration information for receiving the first protocol entity from the first access network device.
  • the access network device carries second indication information in the configuration information, which is used to indicate the serial number (for example, PDCP SN) of the first data packet of the first service sent by the first access network device.
  • the terminal device can know the sequence number of the first data packet that should be received. If the sequence number of the first received data packet is greater than the sequence number indicated by the indication information, it means that a data packet has been lost. , The slave terminal device can determine the lost data packet and request the access network device to retransmit the lost data packet.
  • the access network device when the first protocol entity used by the terminal device to transmit the first service undergoes a reconstruction process or the first protocol entity undergoes a data recovery process, the access network device also needs to send the second indication information to the first terminal device. It is used to indicate the serial number (for example, PDCP SN) of the first data packet of the first service sent by the first access network device, so that it can prevent the first terminal device and the first access network device from interfering with the first data packet Understand the packet loss caused by inconsistency.
  • serial number for example, PDCP SN
  • S210 The second access network device sends the second data packet to the second terminal device.
  • the second access network device may send the second indication information to the second terminal device.
  • the second terminal device may send the second indication information to the second terminal device.
  • the communication method 200 provided in the present application can realize that when a terminal device is handed over from the first access network device to the second access network device, the second access network device can be based on the SN in the existing handover process.
  • the status forwarding and data forwarding steps learn the progress of the first service of the first access network device without introducing additional progress interaction information between the two access network devices, thereby avoiding inconsistent multicast service progress of different access network devices
  • the resulting terminal equipment redundantly receives data packets or service data is interrupted.
  • FIG. 3 is a schematic flowchart of a method 300 for handover of a terminal device across an access network device in the prior art.
  • the handover is a handover process initiated by the source gNB.
  • the source base station decides to switch the UE according to the measurement report reported by the UE, and initiates a handover request to the target base station (Target gNB, TgNB), and obtains the TgNB from the SgNB After the affirmative handover response, SgNB sends a handover command to the UE.
  • the UE receives the handover command, the UE stops sending uplink or downlink data with the SgNB, and the UE starts to synchronize to the TgNB and initiates a random access process.
  • the SgNB sends a handover command to the UE, it stops the uplink or downlink data transmission with the UE, and sends the data stored in the SgNB to the TgNB. After successfully accessing the TgNB, the UE starts to transmit uplink or downlink data with the TgNB.
  • the method 300 shown in FIG. 3 may include S301 to S308. In the following, each step in the method 300 will be briefly described with reference to FIG. 3.
  • the source gNB determines the target gNB for the UE according to the measurement report of the UE and the radio resource management algorithm RRM algorithm when the UE meets the handover condition, and sends the UE Context information along with the handover request to the target gNB.
  • the target gNB prepares for the UE to be handed over, and at the same time allocates the cell identification parameter C-RNTI and other parameters to the UE, and returns it to the source gNB in the handover request confirmation message. After receiving the handover request confirmation message, the source gNB prepares to forward the packet data to the target gNB.
  • the SgNB sends a "Handover Command" to the UE (the handover command includes the following information: the new C-RNTI, the SIB of the target gNB, and the configuration information of the UE, such as MAC, RLC, PDCP layer configuration, etc.), the UE After receiving the handover command, stop uplink or downlink data transmission with the source gNB, and synchronize to the target gNB.
  • the handover command includes the following information: the new C-RNTI, the SIB of the target gNB, and the configuration information of the UE, such as MAC, RLC, PDCP layer configuration, etc.
  • the source gNB forwards the buffered uplink data sent by the UE and the downlink data sent by the UPF to the target gNB.
  • S305 The source station sends SN status information and Data forwarding to the target station (dotted line step).
  • S306 After the UE disconnects the data transmission from the source gNB, it initiates a downlink synchronization process with the target gNB, and then initiates a random access process to obtain uplink timing and uplink resource allocation.
  • the target gNB sends the tracking area TA to the UE and indicates the resources allocated to it to the UE. This information will be used by the UE to send an RRC connection reconfiguration complete message to the target gNB to indicate the completion of the handover.
  • S307 The UE sends a "handover confirmation" message to the target gNB, indicating that the handover is complete.
  • the target gNB indicates to the source gNB that the handover is complete, so that the source gNB releases the context information of the UE.
  • the target gNB notifies the core network node to update the data forwarding destination gNB information, so that the core network can send the UE's data to the target gNB.
  • FIG. 4 shows a schematic diagram of a multicast service switching scenario 400.
  • 4 includes a core network device 410, an access network device 420, an access network device 430, a terminal device 440, and a terminal device 450.
  • the access network device 420 and the access network device 430 receive the multicast service data sent by the core network device 410 and send it to the terminal devices within its coverage.
  • the terminal device 450 is switched from the access network device 420 to the access network device 430 ,
  • the progress of the multicast service of the access network device 420 and the access network device 430 is inconsistent, and the existing handover procedure may cause the terminal device 450 to receive redundant data packets or cause the terminal device 450 to experience data interruption.
  • FIG. 5 is a schematic flowchart of a communication method 500 according to an embodiment of the present application.
  • the method 500 can be applied in the scenario shown in FIG. 1, of course, can also be applied in other communication scenarios, and the embodiment of the present application is not limited herein.
  • the first terminal device in the first access network device is switched from the first access network device to the second access network device, the first access network device and the second access network device The devices all perform this first service.
  • the first terminal device uses the same protocol entity to process the data packets received from the first access network device and the second access network device before and after the switch, for example, Perform sorting, duplicate detection, etc.
  • the terminal device and the access network device are taken as an example of the execution subject of the execution method to describe the method.
  • the execution body of the execution method may also be a chip, a chip system, or a processor applied to a terminal device and an access network device.
  • the method 500 shown in FIG. 5 may include S501 to S505.
  • each step in the method 500 will be described in detail with reference to FIG. 5.
  • the first access network device forwards a data packet to the second access network device, and the data packet sent by the first access network device is a data packet of the first service.
  • the second access network device receives a data packet sent by the first access network device.
  • the first access network device needs to forward the data sent from the core network device and not successfully sent to the first terminal device to the second access network device, that is, data forwarding Data forwading process. Since the serial numbers of the first protocol layer of the two access network devices are determined according to the first indication information sent by the core network device, for data packets with the same content, the two access network devices determine the first The sequence numbers of the protocol layers are the same, so after the second access network device receives the data packet forwarded by the first access network device, it can know that the first service is in the first protocol layer according to the serial number of the first protocol layer of the data packet. For the sending progress of the first access network device, a corresponding sending strategy can be adopted to ensure the service continuity of the first terminal device.
  • the second access network device according to the second sequence number of the first protocol layer of the data packet currently being sent to the first terminal device and the received first protocol of the data packet sent by the first access network device
  • the layer first sequence number determines whether to send third indication information to the first access network device, where the third indication information is used to instruct the first access network device to stop forwarding data packets to the second access network device.
  • the second sequence number of the first protocol layer of the data packet that the second access network device is currently sending to the first terminal device is equal to or greater than the first sequence number of the data packet sent by the first access network device.
  • the second access network device sends third indication information to the first access network device.
  • the second sequence number of the first protocol layer of the data packet currently being sent by the second access network device to the first terminal device is N
  • the first sequence number of the data packet sent by the first access network device When the first sequence number of the protocol layer is N-1, the second access network device sends third indication information to the first access network device.
  • the second access network device starts to send data packets of the first service to the terminal device, and at the same time, the first access network device forwards to the second access network device that the terminal is not connected from the first
  • the network device receives the data packet of the first service successfully, and when the sequence number of the data packet received by the second access network device from the first access network device is greater than or equal to the sequence number of the data packet sent to the terminal device, the data packet is indicated Forwarding stops.
  • the sending progress of the second access network device is fast, as shown in FIG. 6, FIG.
  • FIG. 6 is a schematic flowchart of data forwarding in a communication method according to an embodiment of the present application, and the user plane function receives The data packet of the first service sent by the data server.
  • the data server sends the data packet of the first service, it carries indication information such as the service serial number.
  • the user plane function sends the received data packet of the first service to the first service.
  • An access network device and the second access network device send data packets, but the progress of the user plane function sending data packets to the first access network device and the second access network device is inconsistent.
  • the second access network device When the progress of the data packet forwarded from the first access network device catches up with the transmission progress of the second access network device, that is, when the second access network device receives from the first access network device The sequence number of the data packet is greater than or equal to that after the terminal device is successfully handed over to the second access network device, when the second access network device passes the SN of the first data packet of the first service sent by the second access network device, the second access network device The network access device sends stop instruction information to the first access network device, indicating the end of data forwarding.
  • the third indication information may include identification information of the first service.
  • the first access network device receives the third indication information from the second access network device.
  • S505 The first access network device stops forwarding the data packet to the second access network device according to the third instruction information.
  • the first access network device stops data forwarding after receiving the instruction information. Until the first access network device receives the stop instruction information of the target station, data forwarding is always performed.
  • the second access network device determines whether the data forwarding of the first access network device can be stopped, and sends the data forwarding stop instruction information to the first access network device , It can ensure the continuity of the terminal equipment receiving the multicast service during the handover process, and avoid packet loss or redundant transmission.
  • the method 500 may further include:
  • the second access network device receives the status report information of the data packet sent by the first terminal device, and the status report information of the data packet is used to indicate to the second access network device that the first terminal device has successfully received Data packets of the first service and data packets that were not successfully received;
  • the second access network device sends fourth indication information to the first access network device according to the status report information, where the fourth indication information is used to instruct the first access network device to send the second access network device to the second access network device.
  • the first data packet refers to the data packet that the first access network device starts to forward to the second access network device or all the forwarded data packets during the data forwarding process The packet with the smallest sequence number;
  • the first access network device forwards the data packet to the second access network device according to the fourth instruction information.
  • the first terminal device sends the status report information of the data packet to the second access network device after the handover, indicating which data packets and which data the first terminal device successfully received by the second access network device The packet is not successfully received.
  • the second access network device After receiving the status report information, the second access network device sends the fourth indication information to the first access network device.
  • the fourth indication information indicates that the first terminal device did not receive it first.
  • the serial number of the first protocol layer of the received data packet that is, the initial data packet for data forwarding by the first access network device, so as to prevent the first terminal device from receiving redundant data packets, that is, the first access network device
  • the data packet sent by the network device is successfully received by the first terminal device, it is still forwarded by the first access network device to the second access network device, and then sent to the first access network device by the second access network device.
  • Terminal Equipment
  • FIG. 7 is a schematic flowchart of a communication method 600 according to an embodiment of the application.
  • the method 600 can be applied in The scenario shown in FIG. 1 can of course also be applied to other communication scenarios, and the embodiment of the present application does not limit it here.
  • the terminal device and the first access network device are simultaneously The connection with the second access network device is maintained, so that the first access network device and the second access network device can simultaneously send the first service to the terminal device.
  • the first access network device can continue to send data packets that were not successfully received by the terminal device before the handover.
  • the terminal device can also receive data packets of the first service from the second access network device.
  • the serial number of the data packet received by the access network device can be continuous with the serial number of the data packet received from the second access network device (for example, the maximum SN received from the first access network device is 9 data packets, and Receiving a data packet with a minimum SN of 10 from the second access network device)
  • the first access network device can stop sending data packets to the terminal device, and can disconnect the terminal device.
  • the terminal device and the access network device are taken as an example of the execution subject of the execution method to describe the method.
  • the execution body of the execution method may also be a chip, a chip system, or a processor applied to a terminal device and an access network device.
  • the method 600 shown in FIG. 7 may include S601 to S603.
  • each step in the method 600 will be described in detail with reference to FIG. 7.
  • the second access network device sends fifth indication information to the first access network device, where the fifth indication information includes a first sequence number N, and the first sequence number is used to instruct the first terminal device to receive After the first access network device successfully switches to the second access network device, the sequence number of the first data packet of the first service sent by the second access network device to the first terminal device.
  • the first access network device receives fifth indication information sent by the second access network device.
  • the first access network device decides when to stop the connection of the terminal device according to the SN indicated by the second access network device, which can ensure that the terminal device continuously receives multicast services during the handover process. Performance to avoid packet loss or redundant transmission.
  • the first terminal device simultaneously receives the data packet of the first service from the first access network device and the second access network device, and the first access network device does not need to send the data packet to the second access network device.
  • the second access network device forwards the data packet of the first service, that is, the data forwarding process is not required.
  • the data packets with SN 9 and 10 are not forwarded and directly pass the first access network device. Sent to the first terminal device.
  • the first access network device sends stop instruction information to the second access network device, instructing the first access network device to disconnect from the first terminal device.
  • the second access network device may send to the first access network device information that the first terminal device has successfully switched, and the first After the access network device receives the successful handover information of the first terminal device, the first access network device sends the latest first serial number of the first protocol layer sent to the first terminal device to the second access device.
  • the second access network device determines whether the first access network device stops sending the first terminal device to the first terminal device according to the first sequence number of the first protocol layer and the second sequence number of the first protocol layer A service data packet, the second sequence number of the first protocol layer is received from the second access network device after the first terminal device switches from the first access network device to the second access network device The serial number of the first protocol layer of the first data packet of the device.
  • the second access network device sends indication information to the first access network device for indicating the first access network The device is disconnected from the first terminal device.
  • the second access network device sends fifth indication information to the first access network device, where the fifth indication information includes a first sequence number N-1, and the first sequence number is used to indicate the first
  • the first access network device stops sending the data packet to the terminal device.
  • FIG. 8 shows a schematic block diagram of a communication device 700 according to an embodiment of the present application.
  • the apparatus 700 may be a terminal device, or a chip or circuit, for example, a chip or circuit that can be provided in a terminal device.
  • the apparatus 700 may be an access network device, or a chip or circuit, for example, a chip or circuit that can be provided in an access network device.
  • the apparatus 700 may be a core network device, or a chip or circuit, such as a chip or circuit that can be provided in a core network device.
  • the apparatus 700 may include a processing unit 710 (that is, an example of a processor) and a transceiver unit 730.
  • the processing unit 710 may also be referred to as a determining unit.
  • the transceiver unit 730 may include a receiving unit and a sending unit.
  • the transceiver unit 730 may be implemented by a transceiver or a transceiver-related circuit or interface circuit.
  • the device may further include a storage unit 720.
  • the storage unit 720 is used to store instructions.
  • the storage unit may also be used to store data or information.
  • the storage unit 720 may be implemented by a memory.
  • the processing unit 710 is configured to execute the instructions stored in the storage unit 720, so that the apparatus 700 implements the steps performed by the terminal device in the foregoing method.
  • the processing unit 710 may be used to call the data of the storage unit 720, so that the apparatus 700 implements the steps performed by the terminal device in the foregoing method.
  • the processing unit 710 is configured to execute the instructions stored in the storage unit 720, so that the apparatus 700 implements the steps performed by the access network device in the foregoing method.
  • the processing unit 710 may be used to call the data of the storage unit 720, so that the apparatus 700 implements the steps performed by the access network device in the foregoing method.
  • the processing unit 710, the storage unit 720, and the transceiving unit 730 may communicate with each other through an internal connection path to transfer control and/or data signals.
  • the storage unit 720 is used to store a computer program, and the processing unit 710 can be used to call and run the calculation program from the storage unit 720 to control the transceiver unit 730 to receive and/or send signals to complete the above method. Steps for terminal equipment or access network equipment.
  • the storage unit 720 may be integrated in the processing unit 710, or may be provided separately from the processing unit 710.
  • the transceiver unit 730 includes a receiver and a transmitter.
  • the receiver and the transmitter may be the same or different physical entities. When they are the same physical entity, they can be collectively referred to as transceivers.
  • the transceiving unit 730 may be a transmitting unit or a transmitter when sending information, and the transceiving unit 730 may be a receiving unit or a receiver when receiving information
  • the transceiver unit may be a transceiver, and the transceiver, transmitter or receiver may be a radio frequency circuit.
  • the storage unit is used to store computer instructions.
  • the processor is in communication with the memory, and the processor executes The computer instructions stored in the memory enable the apparatus to execute the method 200, the method 500, or the method 600.
  • the processor may be a general-purpose central processing unit (CPU), a microprocessor, or an application specific integrated circuit (ASIC).
  • the transceiver unit 730 includes an input interface and an output interface.
  • the transceiving unit 730 may be an input and/or output interface, pin or circuit, or the like.
  • the processing unit 710 can execute computer-executable instructions stored in the storage unit, so that the apparatus can execute the method 200, the method 500, or the method 600.
  • the storage unit is a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit in the terminal located outside the chip, such as a read-only memory (Read Only Memory). Only Memory (ROM) or other types of static storage devices that can store static information and instructions, Random Access Memory (RAM), etc.
  • ROM read-only memory
  • RAM Random Access Memory
  • the function of the transceiving unit 730 may be implemented by a transceiving circuit or a dedicated chip for transceiving.
  • the processing unit 710 may be implemented by a dedicated processing chip, a processing circuit, a processing unit, or a general-purpose chip.
  • a general-purpose computer may be considered to implement the communication device (such as a terminal device or an access network device) provided in the embodiment of the present application. That is to say, the program code for realizing the functions of the processing unit 710 and the transceiving unit 730 is stored in the storage unit 720, and the general processing unit implements the functions of the processing unit 710 and the transceiving unit 730 by executing the code in the storage unit 720.
  • the apparatus 700 may be an access network device, and the access network device is a first access network device, or a chip or circuit provided in the first access network device.
  • the transceiving unit 730 is configured to receive the first data packet and the first indication information from the core network device.
  • the instruction information is used to indicate the sequence of the first data packet in at least one data packet;
  • the processing unit 710 is used to determine the first sequence number of the first protocol layer of the first data packet according to the first instruction information;
  • the transceiver unit 730 It is used to send the first data packet to the terminal device.
  • the first indication information includes at least one of the following information: General Packet Radio Service Tunneling Protocol-User Plane GTP-U sequence number, first service sequence number; the first service sequence number is the core Set by the network device or the data server, the first data packet is a data packet of the first service, and the at least one data packet is a data packet of the first service.
  • the first protocol layer includes at least one of the following: a service data adaptation protocol SDAP layer, a packet data convergence protocol PDCP layer, and a radio link control layer protocol RLC layer.
  • the processing unit 710 is further configured to: when any one of the first protocol entity is newly created, the first protocol entity is rebuilt, and the first protocol entity is restored, according to the first indication information The initial sequence number of the first protocol layer of the first data packet is determined.
  • the transceiving unit 730 is further configured to send second indication information to the terminal device, where the second indication information is used to indicate a new establishment in the first protocol entity or a re-establishment of the first protocol entity or the second indication information. After a protocol entity is restored, the sequence number of the first data packet belonging to the first service sent by the first access network device to the terminal device.
  • the transceiving unit 730 is further configured to: receive third indication information from the second access network device, and the third indication information is used to instruct the first access network device to stop communicating with the second access network device.
  • the network access device forwards the data packet; the processing unit 710 is configured to stop forwarding the data packet to the second access network device according to the third instruction information.
  • the transceiving unit 307 is further configured to: receive fourth instruction information sent by the second access network device, where the fourth instruction information is used to instruct the first access network device to send to the second access network device.
  • the sequence number of the first data packet forwarded by the network access device; the processing unit 710 is configured to forward the data packet to the second access network device according to the fourth instruction information.
  • the transceiving unit 730 is further configured to: receive fifth indication information sent by the second access network device, where the fifth indication information includes the first sequence number N, and the fifth indication information includes the second sequence.
  • Number N the second serial number is used to indicate the serial number of the first data packet belonging to the first service sent by the second access network device to the terminal device after the terminal device is switched, and the processing unit 710 uses When it is determined that the protocol layer sequence number corresponding to the data packet successfully sent by the first access network device to the terminal device is N-1, stop sending the data packet to the terminal device.
  • each module or unit in the apparatus 700 can be used to perform various actions or processes performed by the first access network device in the foregoing method.
  • each module or unit in the apparatus 700 can be used to perform various actions or processes performed by the first access network device in the foregoing method.
  • the apparatus 700 may be a terminal device, or a chip or circuit provided in the terminal device.
  • the transceiving unit 730 is used to receive the second indication information sent by the first access network device, and the second indication information is used to indicate that it is in the first access network device. After a protocol entity is newly created or the first protocol entity is rebuilt or the first protocol entity is restored, the sequence number of the first data packet belonging to the first service sent by the first access network device to the terminal device.
  • the transceiving unit 730 is further configured to send request information to the first access network device when the first protocol entity is rebuilt or restored, and the request information is used to request the first access network device After the first protocol entity is rebuilt or the first protocol entity is restored, the sequence number of the first data packet belonging to the first service sent by the first access network device to the terminal device is sent.
  • the transceiving unit 730 is further configured to: send status report information of the data packet to the second access network device, and the status report information of the data packet is used to indicate that the second access network device and the terminal Data packets successfully received by the device and data packets not successfully received, wherein the terminal device is switched from the first access network device to the second access network device.
  • each module or unit in the device 700 can be used to execute each action or processing procedure performed by the first terminal device in the above method.
  • the details are omitted. illustrate.
  • the apparatus 700 may be an access network device, and the access network device is a first access network device, or a chip or circuit provided in the first access network device.
  • the transceiving unit 730 is configured to receive the first data packet and the first indication information from the core network device.
  • the instruction information is used to indicate the sequence of the first data packet in at least one data packet;
  • the processing unit 710 is used to determine the first sequence number of the first protocol layer of the first data packet according to the first instruction information;
  • the transceiver unit 730 It is used to send the first data packet to the terminal device.
  • the first indication information includes at least one of the following information: General Packet Radio Service Tunneling Protocol-User Plane GTP-U sequence number, first service sequence number; the first service sequence number is the core Set by the network device or the data server, the first data packet is a data packet of the first service, and the at least one data packet is a data packet of the first service.
  • the first protocol layer includes at least one of the following: a service data adaptation protocol SDAP layer, a packet data convergence protocol PDCP layer, and a radio link control layer protocol RLC layer.
  • the processing unit 710 is further configured to: when any one of the first protocol entity is newly created, the first protocol entity is rebuilt, and the first protocol entity is restored, according to the first indication information The initial sequence number of the first protocol layer of the first data packet is determined.
  • the transceiving unit 730 is further configured to send second indication information to the terminal device, where the second indication information is used to indicate a new establishment in the first protocol entity or a re-establishment of the first protocol entity or the second indication information. After a protocol entity is restored, the sequence number of the first data packet belonging to the first service sent by the first access network device to the terminal device.
  • the transceiving unit 730 is further configured to: receive a data packet sent by the first access network device,
  • the second terminal device in the first access network device is switched from the first access network device to the second access network device, and both the first terminal device and the second terminal device perform the first service ,
  • the data packet sent by the first access network device is the data packet of the first service;
  • the second sequence number of the first protocol layer of the data packet currently being sent to the first terminal device is equal to or greater than that of the first access network device.
  • the third instruction information is sent to the first access network device, and the third instruction information is used to instruct the first access network device to stop sending the The second access network device forwards the data packet.
  • the transceiving unit 730 is further configured to: receive status report information of a data packet sent by the second terminal device, and the status report information of the data packet is used to indicate that the second access network device, the terminal Data packets successfully received by the device and data packets not successfully received; according to the status report information, fourth indication information is sent to the first access network device, and the fourth indication information is used to indicate the first access network device The sequence number of the first data packet forwarded to the second access network device.
  • the transceiver unit 730 is further configured to: send fifth indication information to the first access network device, where the fifth indication information includes a second sequence number N, and the fifth indication information includes a second sequence Number N, the second serial number is used to indicate the serial number of the first data packet belonging to the first service sent by the second access network device to the second terminal device after the second terminal device is switched.
  • each module or unit in the apparatus 700 can be used to perform various actions or processes performed by the second access network device in the above method.
  • each module or unit in the apparatus 700 can be used to perform various actions or processes performed by the second access network device in the above method.
  • the apparatus 700 may be a core network device, or a chip or circuit provided in the core network device.
  • the transceiver unit 730 is used to receive the first data packet sent by the data server; the transceiver unit 730 is used to send the first data packet to the first access network device Two data packets and first indication information, the first indication information is used to indicate the order of the second data packet in at least one data packet sent by the core network device; the transceiving unit 730 is used to send the second data packet to the second access network device
  • the third data packet and the second instruction information the first instruction information is used to indicate the order of the third data packet in at least one data packet sent by the core network device, the data of the second data packet and the third data packet
  • the data of is the same as the data of the first data packet.
  • the first indication information includes at least one of the following information: General Packet Radio Service Tunneling Protocol-User Plane GTP-U sequence number, first service sequence number; the first service sequence number is the core Set by the network device or the data server, the first data packet is a data packet of the first service, and the at least one data packet is a data packet of the first service.
  • each module or unit in the device 700 can be used to perform various actions or processing procedures performed by the core network device in the above method.
  • the details are omitted. illustrate.
  • FIG. 9 is a schematic structural diagram of a terminal device 800 provided by this application.
  • the terminal device 800 can execute the actions performed by the terminal device in the foregoing method embodiments.
  • FIG. 9 only shows the main components of the terminal device.
  • the terminal device 800 includes a processor, a memory, a control circuit, an antenna, and an input and output device.
  • the processor is mainly used to process the communication protocol and communication data, and to control the entire terminal device, execute the software program, and process the data of the software program. For example, it is used to support the terminal device to execute the above-mentioned transmission precoding matrix instruction method embodiment.
  • the memory is mainly used to store software programs and data, such as the codebook described in the above embodiments.
  • the control circuit is mainly used for the conversion of baseband signals and radio frequency signals and the processing of radio frequency signals.
  • the control circuit and the antenna together can also be called a transceiver, which is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users.
  • the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program.
  • the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna.
  • the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.
  • FIG. 9 only shows a memory and a processor. In an actual terminal device, there may be multiple processors and memories.
  • the memory may also be referred to as a storage medium or a storage device, etc., which is not limited in the embodiment of the present application.
  • the processor may include a baseband processor and a central processing unit.
  • the baseband processor is mainly used to process communication protocols and communication data.
  • the central processing unit is mainly used to control the entire terminal device, execute software programs, and process software programs. data.
  • the processor in FIG. 9 integrates the functions of the baseband processor and the central processing unit.
  • the baseband processor and the central processing unit may also be independent processors, which are interconnected by technologies such as a bus.
  • the terminal device may include multiple baseband processors to adapt to different network standards, the terminal device may include multiple central processors to enhance its processing capabilities, and various components of the terminal device may be connected through various buses.
  • the baseband processor may also be expressed as a baseband processing circuit or a baseband processing chip.
  • the central processing unit can also be expressed as a central processing circuit or a central processing chip.
  • the function of processing the communication protocol and the communication data can be built in the processor, or can be stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.
  • the antenna and the control circuit with the transceiving function may be regarded as the transceiving unit 810 of the terminal device 800, and the processor with the processing function may be regarded as the processing unit 820 of the terminal device 800.
  • the terminal device 800 includes a transceiving unit 810 and a processing unit 820.
  • the transceiving unit may also be referred to as a transceiver, a transceiver, a transceiving device, and so on.
  • the device for implementing the receiving function in the transceiving unit 810 can be regarded as the receiving unit, and the device for implementing the sending function in the transceiving unit 810 can be regarded as the sending unit, that is, the transceiving unit includes a receiving unit and a sending unit.
  • the receiving unit may also be called a receiver, a receiver, a receiving circuit, etc.
  • the sending unit may be called a transmitter, a transmitter, or a transmitting circuit, etc.
  • FIG. 10 is a schematic structural diagram of an access network device 900 provided by an embodiment of the application, which can be used to implement the access device (for example, the first access network device, the second access network device, or the third access network device) in the above method.
  • Access network equipment function.
  • the access network equipment 900 includes one or more radio frequency units, such as a remote radio unit (RRU) 910 and one or more baseband units (BBU) (also referred to as digital units, digital units, DU)920.
  • RRU 910 may be called a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and it may include at least one antenna 911 and a radio frequency unit 912.
  • the RRU910 part is mainly used for receiving and sending radio frequency signals and converting radio frequency signals and baseband signals, for example, for sending the signaling messages described in the foregoing embodiments to terminal equipment.
  • the BBU920 part is mainly used to perform baseband processing, control the base station, and so on.
  • the RRU 910 and the BBU 920 may be physically set together, or may be physically separated, that is, a distributed base station.
  • the BBU 920 is the control center of the base station, and may also be called a processing unit, which is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading.
  • the BBU (processing unit) 920 may be used to control the base station 40 to execute the operation procedure of the network device in the foregoing method embodiment.
  • the BBU 920 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network of a single access standard (such as an LTE system or a 5G system), and may also support different access networks. Enter the standard wireless access network.
  • the BBU 920 further includes a memory 921 and a processor 922.
  • the memory 921 is used to store necessary instructions and data.
  • the memory 921 stores the codebook in the above-mentioned embodiment and the like.
  • the processor 922 is configured to control the base station to perform necessary actions, for example, to control the base station to execute the operation procedure of the network device in the foregoing method embodiment.
  • the memory 921 and the processor 922 may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.
  • SoC system-on-chip
  • all or part of the functions of part 920 and part 910 can be realized by SoC technology, for example, a base station function chip Realization, the base station function chip integrates a processor, a memory, an antenna interface and other devices, the program of the base station related functions is stored in the memory, and the processor executes the program to realize the relevant functions of the base station.
  • the base station function chip can also read a memory external to the chip to implement related functions of the base station.
  • FIG. 10 the structure of the access network device illustrated in FIG. 10 is only a possible form, and should not constitute any limitation in the embodiment of the present application. This application does not exclude the possibility of other types of base station structures that may appear in the future.
  • the processor may be a central processing unit (central processing unit, CPU), and the processor may also be other general-purpose processors, digital signal processors (digital signal processors, DSP), and dedicated integration Circuit (application specific integrated circuit, ASIC), ready-made programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • Access memory synchronous DRAM, SDRAM
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • synchronous connection dynamic random access memory Take memory (synchlink DRAM, SLDRAM) and direct memory bus random access memory (direct rambus RAM, DR RAM).
  • the above-mentioned embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination.
  • the above-mentioned embodiments may be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions or computer programs.
  • the processes or functions described in the embodiments of the present application are generated in whole or in part.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server or data center via wired (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more sets of available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium.
  • the semiconductor medium may be a solid state drive.
  • the embodiment of the present application also provides a computer-readable medium on which a computer program is stored.
  • the steps performed by the terminal device in any of the above embodiments are implemented, or the first access network device executes the steps. , Or the steps performed by the second access network device, or the steps performed by the core network device.
  • the embodiments of the present application also provide a computer program product that, when executed by a computer, implements the steps performed by the terminal device in any of the above embodiments, or the steps performed by the first access network device, or the second Steps performed by the access network equipment, or steps performed by the core network equipment.
  • An embodiment of the present application also provides a system chip, which includes: a communication unit and a processing unit.
  • the processing unit may be a processor, for example.
  • the communication unit may be, for example, a communication interface, an input/output interface, a pin or a circuit, or the like.
  • the processing unit can execute computer instructions so that the chip in the communication device executes the steps performed by the terminal device provided in the embodiment of the present application, or the steps performed by the first access network device, or the steps performed by the second access network device. Steps, or steps performed by core network equipment.
  • the computer instructions are stored in a storage unit.
  • the embodiment of the present application also provides a communication system, which includes the aforementioned first access network device, second access network device, core network device, and terminal device.
  • computer-readable media may include, but are not limited to: magnetic storage devices (for example, hard disks, floppy disks, or tapes, etc.), optical disks (for example, compact discs (CD), digital versatile discs (digital versatile disc, DVD)) Etc.), smart cards and flash memory devices (for example, erasable programmable read-only memory (EPROM), cards, sticks or key drives, etc.).
  • magnetic storage devices for example, hard disks, floppy disks, or tapes, etc.
  • optical disks for example, compact discs (CD), digital versatile discs (digital versatile disc, DVD)
  • smart cards and flash memory devices for example, erasable programmable read-only memory (EPROM), cards, sticks or key drives, etc.
  • various storage media described herein may represent one or more devices and/or other machine-readable media for storing information.
  • the term "machine-readable medium” may include, but is not limited to, wireless channels and various other media capable of storing, containing, and/or carrying instructions and/or data.
  • the disclosed system, device, and method can be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

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Abstract

本申请提供了一种通信方法、接入网设备、终端设备和核心网设备，可以在该终端设备从该第一接入网设备切换至该第二接入网设备的过程中，该第二接入网设备可以根据第一接入网设备转发的数据包的第一序列号获知该第一接入网设备的第一业务进度，而无需在两个接入网设备间引入额外的进度交互信息。该方法包括：该第一接入网设备接收来自核心网设备的第一数据包以及第一指示信息，该第一指示信息用于指示该第一数据包在至少一个数据包中的顺序；根据该第一指示信息确定该第一数据包的第一协议层的第一序列号；将该第一数据包发送给终端设备。

Description

一种通信方法、接入网设备、终端设备和核心网设备
本申请要求于2020年3月20日提交中国专利局、申请号为202010203782.4、申请名称为“一种通信方法、接入网设备、终端设备和核心网设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，并且更具体的，涉及一种通信方法、接入网设备、终端设备和核心网设备。
背景技术
多媒体广播多播业务(Multimedia Broadcast Multicast Service，MBMS)是面向多个终端设备的业务，如现场直播业务、部分公共安全业务都属于MBMS业务。目前的通信系统中，在接入网设备与终端设备之间，MBMS业务可以通过与单个终端设备建立专用的承载以单播的传输模式发送给终端设备，也可以通过与多个终端设备建立共用的承载以多播(组播)的传输模式发送给终端设备。无论是单播传输模式还是多播传输模式，不同的接入网设备在向其覆盖范围内的终端设备发送MBMS业务的数据包时会独立确定MBMS业务数据包的序列号。
当终端设备从源接入网设备移动到目标接入网设备的时候，为了继续接收MBMS业务，需要在切换到目标接入网设备以后，继续接收原来在源接入网设备接收的MBMS业务。但是由于两个接入网设备发送的MBMS业务的进度快慢可能不一致，而且源接入网设备和目标接入网设备在确定MBMS业务数据包的序列号时相互独立的，所以终端设备在切换过程中源接入网设备和目标接入网设备对MBMS业务数据包序列号的理解会发生不一致，从而会导致切换前后终端设备对MBMS业务的接收出现中断或者出现接收冗余数据包的情况，无法保证MBMS业务的连续性。
发明内容
本申请提供一种通信方法、接入网设备、终端设备和核心网设备，所述通信方法避免了现有技术中，对于接收MBMS业务的终端设备，在跨接入网设备切换的时候，因为不同接入网设备多播业务进度不一致而导致的终端设备冗余接收数据包或者业务数据中断的情况。
第一方面，提供了一种通信方法，所述方法应用于第一接入网设备，其特征在于，包括：
接收来自核心网设备的第一数据包以及第一指示信息，所述第一指示信息用于指示所述第一数据包在至少一个数据包中的顺序；根据所述第一指示信息确定所述第一数据包的第一协议层的第一序列号；将所述第一数据包发送给终端设备。
因此，在所述终端设备从所述第一接入网设备切换至第二接入网设备的过程中，第二接入网设备可以根据第一接入网设备转发的数据包的序列号获知所述第一接入网设备的第一业务进度，而无需在两个接入网设备间引入额外的进度交互信息。
结合第一方面，在第一方面的某些实现方式中，所述第一指示信息包含以下信息中的至少一种：通用分组无线服务隧道协议-用户面GTP-U序列号、第一业务序列号；所述 第一业务序列号为所述核心网设备或者数据服务器设置的，所述第一数据包为第一业务的数据包，所述至少一个数据包为第一业务的数据包。
结合第一方面，在第一方面的某些实现方式中，所述第一协议层包含以下至少一种：服务数据适配协议SDAP层、分组数据汇聚协议PDCP层和无线链路控制层协议RLC层。
结合第一方面，在第一方面的某些实现方式中，所述方法还包括：当所述第一协议实体新建、所述第一协议实体重建和所述第一协议实体恢复时的任一情况发生时，根据所述第一指示信息设置所述第一数据包的所述第一协议层的起始序列号。
因此，所述第一接入网设备所述第一协议实体新建、所述第一协议实体重建和所述第一协议实体恢复时的任一情况发生时，根据所述第一指示信息设置所述第一数据包的所述第一协议层的起始序列号，确保所述第一业务数据包的连续性，不会因为所述第一协议层的起始序列号的设置引起所述第一业务数据包的断序。
结合第一方面，在第一方面的某些实现方式中，所述方法还包括：向所述终端设备发送第二指示信息，所述第二指示信息用于指示在所述第一协议实体新建或所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于所述第一业务的首个数据包的序列号。
因此，所述终端设备根据所述第二指示信息可以确定首个接收的数据包的所述第一协议层的起始序列号，防止了所述第一终端设备和所述第一接入网设备对首个数据包确定不一致而导致的数据包丢失。
结合第一方面，在第一方面的某些实现方式中，所述方法还包括：接收来自第二接入网设备的第三指示信息，所述第三指示信息用于指示所述第一接入网设备停止向所述第二接入网设备转发数据包；根据所述第三指示信息，停止向所述第二接入网设备转发数据包。
因此，在所述第一终端设备切换过成中，所述第二接入网设备判断所述第一接入网设备的数据转发是否可以停止，并向所述第一接入网设备发送数据转发停止指示信息，可以保证终端涉笔在切换过程中，接收多播业务的连续性，避免发生丢包或者冗余传输。
结合第一方面，在第一方面的某些实现方式中，所述方法还包括：接收所述第二接入网设备发送的第四指示信息，所述第四指示信息用于指示所述第一接入网设备向所述第二接入网设备转发的首个数据包的序列号；根据所述第四指示信息，向所述第二接入网设备转发数据包。
所述第四指示信息指示所述第一终端设备第一个没有收到的数据包的第一协议层的序列号，即所述第一接入网设备做数据转发的起始数据包，这样可以避免所述第一终端设备接收冗余数据包，即所述第一接入网设备发送的数据包虽然被所述第一终端设备成功接收，但是依然被所述第一接入网设备转发给所述第二接入网设备，再由所述第二接入网设备发送给所述第一终端设备。
结合第一方面，在第一方面的某些实现方式中，所述方法还包括：接收第二接入网设备发送的第五指示信息，所述第五指示信息包括第二序列号N，所述第二序列号用于指示所述终端设备切换完成后，所述第二接入网设备向所述终端设备发送的属于所述第一业务的首个数据包的序列号，当所述第一接入网设备向所述终端设备成功发送的数据包对应的协议层序列号为N-1时，所述第一接入网设备停止向所述终端设备发送数据包。
因此，在切换过成中，所述第一接入网设备根据所述第二接入网设备指示的SN，决定何时停止终端设备的连接，可以保证终端设备在切换过程中，接收多播业务的连续性，避免发生丢包或者冗余传输。
结合第一方面，在第一方面的某些实现方式中，所述第一接入网设备向所述第二接入网设备发送停止指示信息，指示所述第一接入网设备与所述第一终端设备断开连接。
结合第一方面，在第一方面的某些实现方式中，所述第二接入网设备向所述第一接入网设备发送第五指示信息，所述第五指示信息包括第二序列号N-1，所述第二序列号用于 指示所述第一接入网设备向所述终端设备成功发送的数据包的第一协议层序列号为N-1时，所述第一接入网设备停止向所述终端设备发送数据包。
因此不需要所述第一接入网设备再进行计算，直接发到第一序列号为N-1的数据包既可以停止发送。
第二方面，提供了一种通信方法，所述方法应用于终端设备，包括：接收来自第一接入网设备的第二指示信息，所述第二指示信息用于指示在所述第一协议实体新建或所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于第一业务的首个数据包的序列号。
结合第二方面，在第二方面的某些实现方式中，所述方法还包括：当所述第一协议实体重建或者恢复时，向第一接入网设备发送请求信息，所述请求信息用于请求所述第一接入网设备发送在所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于第一业务的首个数据包的序列号。
结合第二方面，在第二方面的某些实现方式中，所述方法还包括：向第二接入网设备发送数据包的状态报告信息，所述数据包的状态报告信息用于指示所述第二接入网设备，所述终端设备成功收到的数据包和没有成功接收的数据包，其中，所述终端设备是由所述第一接入网设备切换到所述第二接入网设备的。
第三方面，提供了一种通信方法，所述方法应用于第二接入网设备，包括：接收来自核心网设备的第一数据包以及第一指示信息，所述第一指示信息用于指示所述第一数据包在至少一个数据包中的顺序；根据所述第一指示信息确定所述第一数据包的第一协议层的第二序列号；
将所述第一数据包发送给第一终端设备。
结合第三方面，在第三方面的某些实现方式中，所述第一指示信息包含以下信息的至少一种：通用分组无线服务隧道协议-用户面GTP-U序列号、第一业务序列号；所述第一业务序列号为所述核心网设备或者数据服务器设置的，所述第一数据包为第一业务的数据包，所述至少一个数据包为第一业务的数据包。
结合第三方面，在第三方面的某些实现方式中，所述第一协议层包含以下至少一种：
服务数据适配协议SDAP层、分组数据汇聚协议PDCP层和无线链路控制层协议RLC层。
结合第三方面，在第三方面的某些实现方式中，所述方法还包括：当所述第一协议实体新建、所述第一协议实体重建和所述第一协议实体恢复时的任一情况发生时，根据所述第一指示信息设置所述第一数据包的所述第一协议层的起始序列号。
结合第三方面，在第三方面的某些实现方式中，所述方法还包括：向所述终端设备发送第二指示信息，所述第二指示信息用于指示在所述第一协议实体新建或所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于所述第一业务的首个数据包的序列号。
结合第三方面，在第三方面的某些实现方式中，所述方法还包括：接收来自第一接入网设备的数据包，其中，所述第一接入网设备中的第二终端设备由所述第一接入网设备切换到所述第二接入网设备，所述第一终端设备和所述第二终端设备均进行所述第一业务，所述第一接入网设备发送的数据包为所述第一业务的数据包；当前正在向所述第一终端设备发送的数据包的第一协议层的第二序列号等于或大于所述第一接入网设备发送的数据包的第一协议层第一序列号时，向所述第一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第一接入网设备停止向所述第二接入网设备转发数据包。
结合第三方面，在第三方面的某些实现方式中，所述方法还包括：接收来自所述第二终端设备的数据包的状态报告信息，所述数据包的状态报告信息用于指示所述第二接 入网设备，所述终端设备成功收到的数据包和没有成功接收的数据包；根据所述状态报告信息，向所述第一接入网设备发送第四指示信息，所述第四指示信息用于指示所述第一接入网设备向所述第二接入网设备转发的首个数据包的序列号。
结合第三方面，在第三方面的某些实现方式中，所述方法还包括：向第一接入网设备发送第五指示信息，所述第五指示信息包括第二序列号N，所述第二序列号用于指示所述第二终端设备切换完成后，所述第二接入网设备向所述第二终端设备发送的属于所述第一业务的首个数据包的序列号。
第四方面，提供了一种通信方法，所述方法应用于核心网设备，包括：接收数据服务器发送的第一数据包；向第一接入网设备发送第二数据包以及第一指示信息，所述第一指示信息用于指示所述第二数据包在核心网设备发送的至少一个数据包中的顺序；向第二接入网设备发送第三数据包以及第二指示信息，所述第一指示信息用于指示所述第三数据包在核心网设备的至少一个数据包中的顺序，所述第二数据包的数据和所述第三数据包的数据与所述第一数据包的数据相同。
结合第四方面，在第四方面的某些实现方式中，所述第一指示信息包含以下信息中的至少一种：通用分组无线服务隧道协议-用户面GTP-U序列号、第一业务序列号；所述第一业务序列号为所述核心网设备或者数据服务器设置的，所述第一数据包为第一业务的数据包，所述至少一个数据包为第一业务的数据包。
第五方面，提供了一种接入网设备，所述接入网设备可以是第一接入网设备，也可以是第一接入网设备内的芯片或模块，还可以是芯片或片上系统，所述接入网设备包括：包括：收发单元，用于接收来自核心网设备的第一数据包以及第一指示信息，所述第一指示信息用于指示所述第一数据包在至少一个数据包中的顺序；处理单元，用于根据所述第一指示信息确定所述第一数据包的第一协议层的第一序列号；所述收发单元，还用于将所述第一数据包发送给终端设备。
结合第五方面，在第五方面的某些实现方式中，所述第一指示信息包含以下信息中的至少一种：通用分组无线服务隧道协议-用户面GTP-U序列号、第一业务序列号；所述第一业务的第一序列号为所述核心网设备或者数据服务器设置的，所述第一数据包为第一业务的数据包，所述至少一个数据包为第一业务的数据包。
结合第五方面，在第五方面的某些实现方式中，所述第一协议层包含以下至少一种：服务数据适配协议SDAP层、分组数据汇聚协议PDCP层和无线链路控制层协议RLC层。
结合第五方面，在第五方面的某些实现方式中，所述处理单元还用于：当所述第一协议实体新建、所述第一协议实体重建和所述第一协议实体恢复时的任一情况发生时，根据所述第一指示信息确定所述第一数据包的所述第一协议层的起始序列号。
结合第五方面，在第五方面的某些实现方式中，所述收发单元还用于：向所述终端设备发送第二指示信息，所述第二指示信息用于指示在所述第一协议实体新建或所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于所述第一业务的首个数据包的序列号。
结合第五方面，在第五方面的某些实现方式中，所述收发单元还用于：接收来自第二接入网设备的第三指示信息，所述第三指示信息用于指示所述第一接入网设备停止向所述第二接入网设备转发数据包；所述处理单元用于根据所述第三指示信息，停止向所述第二接入网设备转发数据包。
结合第五方面，在第五方面的某些实现方式中，所述收发单元还用于：接收所述第二接入网设备发送的第四指示信息，所述第四指示信息用于指示所述第一接入网设备向所述第二接入网设备转发的首个数据包的序列号；所述处理单元用于根据所述第四指示信息， 向所述第二接入网设备转发数据包。
结合第五方面，在第五方面的某些实现方式中，所述收发单元还用于：接收第二接入网设备发送的第五指示信息，所述第五指示信息包括第二序列号N，所述第二序列号用于指示所述终端设备切换完成后，所述第二接入网设备向所述终端设备发送的属于所述第一业务的首个数据包的序列号，所述处理单元用于确定当所述第一接入网设备向所述终端设备成功发送的数据包对应的协议层序列号为N-1时，停止向所述终端设备发送数据包。
第六方面，提供了一种终端设备，所述终端设备可以是终端设备，也可以是终端设备内的芯片或模块，还可以是芯片或片上系统，所述终端设备包括：收发单元，用于接收第一接入网设备发送的第二指示信息，所述第二指示信息用于指示在所述第一协议实体新建或所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于第一业务的首个数据包的序列号。
结合第六方面，在第六方面的某些实现方式中，所述收发单元还用于：当所述第一协议实体重建或者恢复时，向第一接入网设备发送请求信息，所述请求信息用于请求所述第一接入网设备发送在所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于第一业务的首个数据包的序列号。
结合第六方面，在第六方面的某些实现方式中，所述收发单元还用于：向第二接入网设备发送数据包的状态报告信息，所述数据包的状态报告信息用于指示所述第二接入网设备，所述终端设备成功收到的数据包和没有成功接收的数据包，其中，所述终端设备是由所述第一接入网设备切换到所述第二接入网设备的。
第七方面，提供了一种接入网设备，所述接入网设备可以是第二接入网设备，也可以是第二接入网设备内的芯片或模块，还可以是芯片或片上系统，所述接入网设备包括：收发单元，用于接收来自核心网设备的第一数据包以及第一指示信息，所述第一指示信息用于指示所述第一数据包在至少一个数据包中的顺序；处理单元，用于根据所述第一指示信息确定所述第一数据包的第一协议层的第二序列号；所述收发单元用于将所述第一数据包发送给第一终端设备。
结合第七方面，在第七方面的某些实现方式中，所述第一指示信息包含以下信息的至少一种：通用分组无线服务隧道协议-用户面GTP-U序列号、第一业务序列号；所述第一业务序列号为所述核心网设备或者数据服务器设置的，所述第一数据包为第一业务的数据包，所述至少一个数据包为第一业务的数据包。
结合第七方面，在第七方面的某些实现方式中，所述第一协议层包含以下至少一种：服务数据适配协议SDAP层、分组数据汇聚协议PDCP层和无线链路控制层协议RLC层。
结合第七方面，在第七方面的某些实现方式中，所述处理单元还用于：当所述第一协议实体新建、所述第一协议实体重建和所述第一协议实体恢复时的任一情况发生时，根据所述第一指示信息设置所述第一数据包的所述第一协议层的起始序列号。
结合第七方面，在第七方面的某些实现方式中，所述收发单元还用于：向所述终端设备发送第二指示信息，所述第二指示信息用于指示在所述第一协议实体新建或所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于所述第一业务的首个数据包的序列号。
结合第七方面，在第七方面的某些实现方式中，所述收发单元还用于：接收第一接入网设备发送的数据包，其中，所述第一接入网设备中的第二终端设备由所述第一接入网设备切换到所述第二接入网设备，所述第一终端设备和所述第二终端设备均进行所述第一业务，所述第一接入网设备发送的数据包为所述第一业务的数据包；当前正在向所述第一终端设备发送的数据包的第一协议层的第二序列号等于或大于所述第一接入网设备发送的数据包的第一协议层第一序列号时，向所述第一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第一接入网设备停止向所述第二接入网设备转发数据包。
结合第七方面，在第七方面的某些实现方式中，所述收发单元还用于：接收所述第二终端设备发送的数据包的状态报告信息，所述数据包的状态报告信息用于指示所述第二接入网设备，所述终端设备成功收到的数据包和没有成功接收的数据包；根据所述状态报告信息，向所述第一接入网设备发送第四指示信息，所述第四指示信息用于指示所述第一接入网设备向所述第二接入网设备转发的首个数据包的序列号。
结合第七方面，在第七方面的某些实现方式中，所述收发单元还用于：向第一接入网设备发送第五指示信息，所述第五指示信息包括第二序列号N，所述第二序列号用于指示所述第二终端设备切换完成后，所述第二接入网设备向所述第二终端设备发送的属于所述第一业务的首个数据包的序列号。
第八方面，提供了一种核心网设备，所述核心网设备可以是核心网设备，也可以是核心网设备内的芯片或模块，还可以是芯片或片上系统，所述核心网设备包括：收发单元，用于接收数据服务器发送的第一数据包；所述收发单元用于向第一接入网设备发送第二数据包以及第一指示信息，所述第一指示信息用于指示所述第二数据包在核心网设备发送的至少一个数据包中的顺序；所述收发单元用于向第二接入网设备发送第三数据包以及第二指示信息，所述第一指示信息用于指示所述第三数据包在核心网设备发送的至少一个数据包中的顺序，所述第二数据包的数据和所述第三数据包的数据与所述第一数据包的数据相同。
结合第八方面，在第八方面的某些实现方式中，所述第一指示信息包含以下信息的至少一种：通用分组无线服务隧道协议-用户面GTP-U序列号、第一业务序列号；所述第一业务序列号为所述核心网设备或者数据服务器设置的，所述第一数据包为第一业务的数据包，所述至少一个数据包为第一业务的数据包。
第九方面，提供了一种通信装置，包括处理器，所述处理器与存储器相连，所述存储器用于存储计算机程序，所述处理器用于执行所述存储器中存储的计算机程序，以使得所述装置执行上述第一方面或第一方面的任意可能的实现方式中的方法，或者第二方面或第二方面的任意可能的实现方式中的方法，或者第三方面或第三方面的任意可能的实现方式中的方法，或者第四方面或第四方面的任意可能的实现方式中的方法。
第十方面，提供了一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序，当所述计算机程序被运行时，实现上述第一方面或第一方面的任意可能的实现方式中的方法，或者第二方面或第二方面的任意可能的实现方式中的方法，或者第三方面或第三方面的任意可能的实现方式中的方法，或者第四方面或第四方面的任意可能的实现方式中的方法。
第十一方面，提供了一种芯片，其特征在于，包括处理器和接口；所述处理器用于读取指令以执行上述第一方面或第一方面的任意可能的实现方式中的方法，或者第二方面或第二方面的任意可能的实现方式中的方法，或者第三方面或第三方面的任意可能的实现方式中的方法，或者第四方面或第四方面的任意可能的实现方式中的方法。
可选地，所述芯片还可以包括存储器，所述存储器中存储有指令，处理器用于执行存储器中存储的指令或源于其他的指令。
第十二方面，提供了一种通信系统，所述系统包括具有实现上述第一方面的各方法及各种可能设计的功能的装置、具有实现上述第二方面的各方法及各种可能设计的功能的装 置、具有实现上述第三方面的各方法及各种可能设计的功能的装置和具有实现上述第四方面的各方法及各种可能设计的功能的装置。
附图说明
图1是本申请实施例的一种应用场景的示意图。
图2是本申请实施例的一种通信方法的示意性流程图。
图3是现有技术中终端设备跨接入网设备切换的方法的示意性流程图。
图4是本申请实施例多播业务的一种应用场景的示意图。
图5是本申请实施例的一种通信方法的示意性流程图。
图6是本申请实施例的一种通信方法的数据转发的示意性流程图。
图7是本申请实施例的一种通信方法的示意性流程图。
图8是本申请实施例的通信装置的示意性框图。
图9为本申请提供的一种终端设备的结构示意图。
图10为本申请提供的一种接入网设备的结构示意图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
为了更好地理解本申请，首先对本申请实施例可能出现的术语进行解释。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通信(global system for mobile communications，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(wideband code division multiple access，WCDMA)系统、通用分组无线业务(general packet radio service，GPRS)、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、第五代(5th generation，5G)系统或新无线(new radio，NR)，此外，还可以适用于使用后续的演进系统，如第六代6G通信系统、甚至更高级的第七代7G通信系统等。
本申请实施例中的终端设备也可以称为：用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端(mobile terminal，MT)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置等。
终端设备可以是无线终端也可以是有线终端，无线终端可以是指向用户提供语音和/或其他业务数据连通性的设备，具有无线连接功能的手持式设备、或连接到无线调制解调器的其他处理设备。无线终端可以经无线接入网(Radio Access Network，RAN)与一个或多个核心网进行通信，无线终端可以是移动终端，如移动电话(或称为“蜂窝”电话)和具有移动终端的计算机，例如，可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置，它们与无线接入网交换语言和/或数据。例如，个人通信业务(Personal Communication Service，PCS)电话、无绳电话、会话发起协议(Session Initiation Protocol，SIP)话机、无线本地环路(Wireless Local Loop，WLL)站、个人数字助理(Personal Digital Assistant，PDA)等设备。无线终端也可以称为系统、订户单元(Subscriber Unit)、订户 站(Subscriber Station)，移动站(Mobile Station)、移动台(Mobile)、远程站(Remote Station)、远程终端(Remote Terminal)、接入终端(Access Terminal)、用户终端(User Terminal)、用户代理(User Agent)、用户设备(User Device or User Equipment)，移动互联网设备(mobile internet device，MID)、可穿戴设备，虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程手术(remote medical surgery)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端、车载设备、可穿戴设备，5G网络中的终端设备或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的终端设备等，本申请实施例对此并不限定。
作为示例而非限定，在本申请实施例中，可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
此外，在本申请实施例中，终端设备还可以是物联网(internet of things，IoT)系统中的终端设备，IoT是未来信息技术发展的重要组成部分，其主要技术特点是将物品通过通信技术与网络连接，从而实现人机互连，物物互连的智能化网络。
而如上介绍的各种终端设备，如果位于车辆上(例如放置在车辆内或安装在车辆内)，都可以认为是车载终端设备，车载终端设备例如也称为车载单元(on-board unit，OBU)。
本申请实施例中，终端设备还可以包括中继(relay)。或者理解为，能够与基站进行数据通信的都可以看作终端设备。
本申请实施例中的接入网设备可以是用于与终端设备通信的设备，可以是基站，或者接入点，或者网络设备，或者可以是指接入网中在空中接口上通过一个或多个扇区与无线终端通信的设备。网络设备可用于将收到的空中帧与IP分组进行相互转换，作为无线终端与接入网的其余部分之间的路由器，其中接入网的其余部分可包括网际协议(IP)网络。网络设备还可协调对空中接口的属性管理。例如，接入网设备可以是全球移动通讯(Global System of Mobile communication，GSM)或码分多址(Code Division Multiple Access，CDMA)中的基站(Base Transceiver Station，BTS)，也可以是宽带码分多址(Wideband Code Division Multiple Access，WCDMA)中的基站(NodeB，NB)，也可以是LTE系统中的演进型基站(evolved NodeB，eNB或eNodeB)，还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器，或者该接入设备可以为中继站、接入点、车载设备、可穿戴设备以及5G网络中的接入设备或者未来演进的PLMN网络中的网络设备等，可以是WLAN中的接入点(access point，AP),可以是新型无线系统(new radio，NR)系统中的gNB本申请实施例并不限定。需要说明的是，对于5G系统，在一个基站下，可能存在一个或多个发送接收点(Transmission Reception Point，TRP)，所有的TRP属于同一个小区，其中，每个TRP和终端都可以使用本申请实施例所述的测量上报方法。在另一种场景下， 网络设备还可以分为控制单元(Control Unit，CU)和数据单元(Data Unit，DU)，在一个CU下，可以存在多个DU，其中，每个DU和终端都可以使用本申请实施例所述的测量上报方法。CU-DU分离场景和多TRP场景的区别在于，TRP只是一个射频单元或一个天线设备，而DU中可以实现协议栈功能，例如DU中可以实现物理层功能。
另外，在本申请实施例中，接入网设备是接入网(radio access network，RAN)中的设备，或者说，是将终端设备接入到无线网络的RAN节点。例如，作为示例而非限定，作为接入网设备，可以列举：gNB、传输接收点(transmission reception point，TRP)、演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(base band unit，BBU)，或无线保真(wireless fidelity，Wifi)接入点(access point，AP)等。
接入网设备为小区提供服务，终端设备通过该小区使用的传输资源(例如，频域资源，或者说，频谱资源)与接入网设备进行通信，该小区可以是接入网设备(例如基站)对应的小区，小区可以属于宏基站，也可以属于小小区(small cell)对应的基站，这里的小小区可以包括：城市小区(metro cell)、微小区(micro cell)、微微小区(pico cell)、毫微微小区(femto cell)等，这些小小区具有覆盖范围小、发射功率低的特点，适用于提供高速率的数据传输服务。
单播(unicast)：点对点的通信技术，即网络设备与终端设备之间的单点通信，网络设备可以针对每个终端设备单独发送数据。单播也可以称为单播传输方式或者单播传输技术。
通过单播传输方式发送是指：发送装置发送协议数据单元(protocol data unit,PDU)对应的传输块(transport block，TB)时，采用小区无线网络临时标识(cell network temporary identifier，C-RNTI)对PDU进行加扰，或对PDU对应的下行控制信息(downlink control information，DCI)进行加扰，一接收装置根据C-RNTI对同一PDU进行接收；或者采用单播的方式传输PDU可以指该PDU在为单播传输建立的无线承载中传输或者在专门为单播设计的信道中进行传输。
采用单播传输方式接收是指采用单播方式发送的时候，所述接收装置根据C-RNTI对PDU进行接收；或者所述接收装置通过为单播传输建立的无线承载接收或者在用于单播传输的信道上进行接收。
多播(multicast)：点到多点的通信技术，也可以称为多播传输方式或者多播传输技术，用来为多媒体广播多播业务服务。多播也可以称为组播，在某些广义的场景中也可以称为一种广播技术，但是多播与传统意义的广播技术存在差异。在采用多播传输方式时，针对同一数据，网络设备(例如基站)发送的过程中有多个终端设备同时进行接收。目前多播传输技术主要分为两种：多媒体广播多播单频网络业务(multimedia broadcast multicast service single frequency network，MBSFN)和单小区点到多点业务(single cell point to multipoint，SC-PTM)。除此之外，其他多播传输技术也在讨论，本发明不作限定。
通过多播传输方式发送是指：发送装置发送协议数据单元(protocol data unit,PDU)对应的传输块(transport block，TB)时，采用分组无线网络临时标识(group radio network  temporary identifier，G-RNTI)对PDU进行加扰，或对PDU对应的下行控制信息(downlink control information，DCI)进行加扰，一个或多个接收装置根据相同的G-RNTI对同一PDU进行接收。或者采用多播的方式传输PDU可以指通过半静态方式通知多个接收装置同一PDU的位置，多个接收装置可以同时对该PDU进行接收。或者采用多播的方式传输PDU可以指该PDU在为多播传输建立的无线承载中传输或者在专门为多播设计的信道中进行传输。
通过多播传输方式接收是指对侧采用多播方式发送的时候，所述多个接收装置中的一个装置根据G-RNTI对PDU进行接收；或者所述多个接收装置中的一个装置通过为多播传输建立的无线承载接收或者在用于多播传输的信道上进行接收PDU。
广播：点到多点的通信技术。与多播不同，广播涉及的技术是发送装置在广播信道上发送PDU对应的TB，所有接收装置都可以在广播信道上对PDU进行接收。与多播技术不同的是，传统意义的广播传输中，广播信道不采用上述G-RNTI加扰方式。
切换(handover，HO)：将一个正在进行中的呼叫从一个无线信道切换到另一个无线信道，以保证通信不中断。无线通信系统中，每个小区覆盖有限的范围，因此当终端设备从当前服务小区移动到相邻小区的时候，为了保证业务的连续性，网络侧需要将业务切换到相邻小区，从而不中断通信过程。切换就是指在通信过程中，为保证通信不中断，把承载通信数据的链路由一个小区(或基站)切换到另一个小区(或基站)的过程。
协议栈(Protocol Stack)：网络设备和终端设备具有一定的协议层结构，以用于相互通信。例如控制面协议层结构可以包括无线资源控制(radio resource control，RRC)层、分组数据汇聚层协议(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)和物理层等。用户面协议层结构可以包括PDCP层、RLC层、MAC层和物理层等。其中，物理层位于最低层(层一)，MAC层、RLC以及PDCP属于第二层(层二)，RRC属于第三层(层三)。在一种实现中，PDCP层之上还可以包括业务数据适配(service data adaptation protocol,SDAP)层。另外在SDAP层的上方还可以有传输控制协议/互联网协议(Transmission Control Protocol/Internet Protocol，TCP/IP)层等传输层以及应用层。
这些协议层的功能可以由一个节点实现，或者可以由多个节点实现；例如，在一种演进结构中，无线接入网设备可以包括集中单元(centralized unit，CU)和分布单元(distributed unit，DU)，多个DU可以由一个CU集中控制。CU和DU可以根据无线网络的协议层划分，例如，PDCP层及以上协议层的功能设置在CU，PDCP以下的协议层，RLC层和MAC层等的功能设置在DU等。
应该理解的是，这种协议层的划分仅仅是一种举例，还可以在其它协议层划分，例如在RLC层划分，将RLC层及以上协议层的功能设置在CU，RLC层以下协议层的功能设置在DU；或者，在某个协议层中划分，例如将RLC层的部分功能和RLC层以上的协议层的功能设置在CU，将RLC层的剩余功能和RLC层以下的协议层的功能设置在DU。此外，也可以按其它方式划分，例如按时延划分，将处理时间需要满足时延要求的功能设置在DU，不需要满足该时延要求的功能设置在CU。
无线承载(Radio Bearer)：一般，可以理解为数据包或者信令在空口上进行传输时所经过的传输路径或者经过的处理策略(treatment)。无线承载包含数据无线承载和信令无 线承载。无线承载通过网络设备的RRC信令进行建立和配置，在无线承载的配置中包含各个协议层的配置，网络设备和终端设备的各协议层的实体按照所述配置在该无线承载中进行数据包或者信令的发送、接收或者处理。技术上，无线承载可以理解为一个传输通道，无论是在终端设备侧还是在网络设备侧，每个无线承载都包含一个PDCP实体和至少一个RLC实体来对在该无线承载中传输的数据包进行处理。除建立无线承载之外，网络设备还可以通过RRC信令添加、修改或者删除(释放)无线承载。
多媒体广播多播业务是用于点到多点的单向多媒体业务。例如，在空中接口通过公共信道向小区内的用户发送多媒体的广播业务，或者以多播的方式向小区内的用户发送由用户订购的多播业务，从而节省空口资源。
下面对本申请实施例的一种应用场景进行介绍，图1示出了本申请实施例的一种应用场景100的示意图。在图1中包括一个接入网设备110、终端设备120、终端设备130、终端设备140、终端设备150、终端设备160和终端设备170。其中，该接入网设备110例如工作在演进的通用移动通信系统陆地无线接入(evolved UMTS terrestrial radio access，E-UTRA)系统中，或者工作在NR系统中，或者工作在下一代通信系统或其他通信系统中，接入网设备110和终端设备120～终端设备170之间可以通过Uu接口通信。在该通信系统中，终端设备120～终端设备170可以发送上行数据给接入网设备110，接入网设备110可以发送下行数据给终端设备120～终端设备170。此外，终端设备150～终端设备170也可以组成一个通信系统。接入网设备110可以发送下行数据给终端设备120～终端设备150，其中，接入网设备110通过单播方式发送下行数据给终端设备120和终端设备150，接入网设备110通过多播方式发送下行数据给终端设备130和终端设备140，终端设备150也可以发送下行数据给终端设备160和终端设备170。
图1中的接入网设备例如为基站。其中，接入网设备在不同的系统对应不同的设备，例如在4G系统中可以对应eNB，在5G系统中对应5G中的接入网设备，例如gNB。本申请实施例所提供的技术方案也可以应用于未来的移动通信系统中，因此图1中的接入网设备也可以对应未来的移动通信系统中的接入网设备。图1以接入网设备是基站为例，实际上接入网设备可以参考前文的介绍。
应理解，图1所示的通信系统中还可以包括更多的网络节点，例如其他终端设备或接入网设备，图1所示的通信系统中包括的接入网设备或者终端设备可以是上述各种形式的接入网设备或者终端设备。本申请实施例在图中不再一一示出。
本申请中的技术方案也可用于其他通信系统，只要该通信系统中需要进行传输方向的指示。另外本申请不仅适用于一个接入网设备多个UE的场景(例如SC-PTM场景)，而且适用于多个接入网设备协作同时与多个UE进行数据通信的场景(例如MBSFN场景)，以及5G中的多播广播场景。
下面结合图2详细说明本申请提供的一种通信方法，图2是本申请实施例的一种通信方法200的示意性流程图，该方法200可以应用在图1所示的场景中，当然也可以应用在其他通信场景中，本申请实施例在此不作限制。
还应理解，在本申请实施例中，以终端设备、接入网设备和核心网设备作为执行方法的执行主体为例，对方法进行说明。作为示例而非限定，执行方法的执行主体也可以是应用于终端设备、接入网设备和核心网设备的芯片、芯片系统、或处理器等。
如图2所示，图2中示出的方法200可以包括S201至S210。下面结合图2详细说明 方法200中的各个步骤。
S201，数据服务器向核心网设备发送第一业务的至少一个数据包。
可选的，该数据服务器在向核心网设备发送第一业务的至少一个数据包时，可以携带该第一业务的进度指示信息，该进度指示信息用于指示当前数据包在该第一业务的至少一个数据包中的位置，该第一业务的进度指示信息可以是该第一业务的序列号。进度指示信息可以携带在数据包中，例如包头中，或者指示信息独立于数据包单独发送。
可选的，在S201之前，该数据服务器接收到核心网设备发送的请求信息，该请求信息用于请求数据服务器在向核心网设备发送第一业务的至少一个数据包时，携带该第一业务的进度指示信息，该数据服务器接收到核心网设备发送的该请求信息，向核心网设备发送第一业务的至少一个数据包时，可以在每个数据包都携带该第一业务的进度指示信息。
可选的，该第一业务可以是MBMS业务。
S202，核心网设备接收数据服务器发送的该第一业务的至少一个数据包。
具体而言，核心网设备在接收到该数据服务器发送的该第一业务的至少一个数据包时，会确定需要接收该第一业务的接入网设备，从而将该至少一个数据包分别向不同的接入网设备发送。
S203，核心网设备向第一接入网设备发送第一数据包以及第一指示信息，所述第一指示信息用于指示所述第一数据包在核心网设备发送的至少一个数据包中的顺序。
值得注意的是，在本实施例中S201和S202仅作为一种可选的步骤，而并不限定S203依赖于S201和S202，具体的核心网设备接收到的数据包可以是从其他地方接收的或者自己产生的，可选的，也可以从其他地方接收进度指示信息，并根据进度指示信息确定各个数据包的顺序。另外也不限定核心网如何向不同接入网设备发送数据包。
S204，核心网设备向第二接入网设备发送第二数据包以及第二指示信息，所述第一指示信息用于指示所述第二数据包在核心网设备发送的至少一个数据包中的顺序，该第一数据包的数据和该第二数据包的数据可以相同，也可以不同，对此不做限制，当第一接入网设备收到的数据包中的数据与第二接入网设备收到的数据包中的数据相同时，第一指示信息与第二指示信息相同。
示例性的，核心网设备向第一接入网设备发送核心网序列号为1-5的5个数据包，向第二接入网设备发送核心网序列号为5-9的5个数据包，则第一接入网设备收到的5个数据包中的最后一个数据包与第二接入网设备收到的5个数据包中的第一个数据包中的内容和大小相同，这两个数据包对应的指示信息相同。
具体而言，核心网设备向接入网设备发送该第一业务的至少一个数据包时，为了能够让接入网设备了解该第一业务的发送进度可以携带第一指示信息，该第一指示信息可以通过为数据包设置核心网序列号实现。该核心网设备向不同接入网设备发送从数据服务器接收到的数据包时，针对相同的数据包(携带的内容或负载相同)，使其携带相同的核心网序列号，即相同的第一指示信息，该第一指示信息用于标识数据包在发送的至少一个数据包中的位置。
可选的，该第一指示信息包含以下信息中的至少一种:通用分组无线服务隧道协议-用户面序列号(GPRS Tunneling Protocol-U Sequence Number，GTP-U)、第一业务序列 号；其中，该第一业务序列号为该核心网设备或者数据服务器设置的，该第一数据包为第一业务的数据包，该至少一个数据包为第一业务的数据包。
下面以GTP-U序列号为例，对第一业务序列号进行简单说明。目前核心网设备与接入网设备在数据传输的时候，核心网设备与不同接入网设备建立不同的PDU session或者GTP隧道独立运作，因此即使核心网设备从数据服务器接收到的相同的数据包，在向不同的接入网设备发送的时候，也可能设置不同的GTP-U SN号。而在本申请中，针对核心网设备从数据服务器接收到的或者自己产生的相同的数据包，核心网设备在向不同的接入网设备发送的时候，设置相同的GTP-U SN号，一种可能的实现方式是每个数据包都根据数据服务器的指示信息设置GTP-U SN号，这样由于GTP-U SN号和数据包内容相关联，所以不同的接入网设备可以根据GTP-U SN号，来判断业务的传输进度。
可选的，数据服务器向核心网设备发送该第一业务的至少一个数据包时如果携带了至少一个数据包分别对应的第一业务序列号，核心网设备可以根据该第一业务序列号向接入网设备发送第一指示信息，第一指示信息可以是该至少一个数据包携带的该第一业务序列号。数据服务器向核心网设备发送该第一业务的至少一个数据包时如果没有携带该第一业务序列号，核心网设备根据接收该至少一个数据包的顺序，重新设置该至少一个数据包的第一业务序列号，例如核心网设备从数据服务器接收到数据包1、数据包2和数据包3，可以给数据包1设置第一业务序列号1，给数据包2设置第一业务序列号2，给数据包3设置第一业务序列号3。
S205，该第一接入网设备接收来自核心网设备的该第一数据包以及该第一指示信息。
值得注意的是，在本实施例中不限定S205依赖于之前步骤的具体实现方式，仅需要从核心网设备接收第一数据包以及第一指示信息即可。
S206，该第一接入网设备根据该第一指示信息确定该第一数据包的第一协议层的第一序列号。
可选的该第一协议层包含以下至少一种协议层：服务数据适配协议SDAP层、分组数据汇聚协议PDCP层和无线链路控制层协议RLC层。
应理解，该第一协议层可以是无线接入网侧的高层协议层，该第一协议层也可称作层二协议层，SDAP、PDCP、RLC和MAC都属于层二协议。除此之外，之后的技术中可能针对新的功能引入新的协议层，所以本实施例不限定第一协议层是现有的协议层，也可以是新定义的协议层。
具体而言，该第一接入网设备收到该第一数据包后，根据该第一指示信息确定该第一数据包的第一协议层的第一序列号，该第一协议层的第一序列号用于第一协议层对该第一数据包进行处理，比如排序、重复检测等。
可选的，当该第一接入网设备建立用于多播传输的第一协议层实体的时候，或者已经建立的用于多播传输的第一协议层实体发生重建(re-establishment)过程或者发生第一协议层实体数据恢复(data recovery)过程的时候，该第一接入网设备的第一协议层实体按照该第一指示信息确定该第一数据包的起始序列号。以PDCP实体为例，在用于多播传输的PDCP实体发生重建以后，该接入网设备收到的第一个数据包的第一指示信息，例如第一指示信息为核心网序列号时，第一数据包对应的核心网序列号为5，则该接入网设备将该第一个数据包的PDCP序列号也设置为5，而不是现有技术的从0开始。即使第一协议层实体发生重建或恢复，也可以保证数据包对应的信息为当前实际的业务进度信息。
S207，该第二接入网设备接收来自核心网设备的该第二数据包以及该第一指示信息。
S208，该第二接入网设备根据该第一指示信息确定该第二数据包的第一协议层的第二序列号。
在步骤S206和步骤S208中，该第一接入网设备和该第二接入网设备在接收到核心网设备发送的数据包及核心网序列号后，需要确定该接收到的数据包的序列号。为了更清楚的理解该步骤，下面结合图6对此进行简单描述。第一接入网设备接收到核心网序列号GTP-U SN为8的第一数据包，该第一接入网设备根据该第一数据包的GTP-U SN确定第一数据包的PDCP SN为8；第二接入网设备接收到核心网序列号GTP-U SN为11的数据包，该第二接入网设备根据第二数据包的GTP-U SN为11确定第二数据包的PDCP SN为11。其中，PDCP为第一协议层的一种示例。
应理解，该第二接入网设备也可以是该第一接入网设备，有关该第二接入网设备的描述可以参考上文关于该第一接入网设备的描述，此处不再赘述。
还应理解，该核心网设备向该第一接入网设备和该第二接入网设备发送相同第一业务，对于相同内容的数据包携带相同的第一指示信息，从而使得第一接入网设备和第二接入网设备可以针对相同内容的数据包，根据相同的第一指示信息确定相同的第一协议层的序列号，即相同数据的数据包在不同接入网设备确定的第一协议层的序列号是相同的。因此，在终端设备从该第一接入网设备切换至该第二接入网设备的过程中，该第二接入网设备可以根据现有切换流程中的SN状态转发以及数据转发步骤获知该第一接入网设备的第一业务进度，而无需在两个接入网设备间引入额外的进度交互信息。
该实施例中涉及多个序列号，其中数据服务器、核心网设备、接入网设备以及终端设备的各个协议层都可能会设置属于各个协议层的序列号，例如核心网序列号为核心网设备为数据包设置的序列号，而PDCP序列号为接入网设备或者终端设备的PDCP层为数据包设置的序列号。不同的序列号位于同一数据包的不同包中，有不同的作用，而且只对相应的设备或者协议层可见。另外“序列号”为所有序列号的统称，并不限定为哪一种序列号，需要根据场景具体确定是哪种序列号，例如PDCP层的序列号即为PDCP序列号。
还有一点值得注意的是，一个数据包从核心网设备发送到接入网设备再到终端设备，会经过很多不同协议层的处理(例如增加数据包的包头)，这些处理是为了传输需要，经过处理后，数据包的大小或者形式可能会发生变化，但是只要数据包负载的内容不发生改变，便可以称为是相同的数据包，例如第一数据包。
S209，该第一接入网设备将该第一数据包发送给第一终端设备。
可选的，该第一接入网设备可以向该第一终端设备发送第二指示信息，该第二指示信息用于指示在该第一终端设备的第一协议实体新建或该第一协议实体发生重建或该第一协议实体发生数据恢复后，该第一接入网设备向该第一终端设备发送的该第一业务的首个数据包的序列号。
作为一种可能实现方式，当该第一终端设备开始接收第一业务之前，第一协议实体新建时首先从该第一接入网设备获取用于接收第一协议实体的配置信息，该第一接入网设备在配置信息中携带第二指示信息，用于指示第一接入网设备发送的第一业务的第一个数据包的序列号(例如PDCP SN)。这样终端设备便可以知道第一个应该接收到的数据包的序列号是多少，如果第一个接收到的数据包的序列号大于该指示信息指示的序列号，则说明有数据包发生了丢失，从终端设备可以确定丢失的数据包并请求接入网设备对丢失的数据包进行重传。
另外，终端设备用于传输第一业务的第一协议实体发生重建过程或者第一协议实体发生数据恢复过程的时候，该接入网设备也需要向该第一终端设备发送该第二指示信息，用于指示第一接入网设备发送的第一业务的第一个数据包的序列号(例如PDCP SN)，因此可以防止该第一终端设备和该第一接入网设备对首个数据包理解不一致而导致的数据包丢失。
S210，该第二接入网设备将该第二数据包发送给第二终端设备。
可选的，该第二接入网设备可以向该第二终端设备发送该第二指示信息，具体描述可 以参考S209中的相关描述，此处不再赘述。
本申请提供的一种通信方法200可以实现终端设备从该第一接入网设备切换至该第二接入网设备的过程中，该第二接入网设备可以根据现有切换流程中的SN状态转发以及数据转发步骤获知该第一接入网设备的第一业务进度，而无需在两个接入网设备间引入额外的进度交互信息，从而可以避免不同接入网设备多播业务进度不一致而导致的终端设备冗余接收数据包或者业务数据中断的情况。
为了更好地理解本申请提供的方法的有益效果，下面对现有技术中终端设备跨接入网设备(以基站为例)切换流程进行简单介绍。跨基站(gNB)的切换流程如图3所示，图3是现有技术中终端设备跨接入网设备切换的方法300的示意性流程图。该切换是由源gNB发起的切换过程，源基站(Source gNB，SgNB)根据UE上报的测量报告决定对UE进行切换，并向目标基站(Target gNB,TgNB)发起切换请求，在SgNB获取到TgNB的肯定切换应答后，SgNB向UE发送切换命令，当UE接收到切换命令后，UE停止与SgNB进行的上行或下行数据发送，UE开始向TgNB进行同步，并发起随机接入过程。SgNB在向UE发送切换命令时，停止与UE之间的上行或下行数据传输，并将保存在SgNB的数据发往TgNB。UE在成功接入TgNB之后，开始与TgNB进行上行或下行数据的传输。图3中示出的方法300可以包括S301至S308。下面结合图3简单说明方法300中的各个步骤。
S301，在切换准备阶段，处于RRC连接态的UE根据基站配置的测量上报触发准则发送“测量报告”(Measurement Report)。
S302，源gNB根据UE的测量报告和无线资源管理算法RRM算法，当UE满足切换条件时，为UE确定目标gNB，并将UE的上下文(UE Context)信息随切换请求发送给目标gNB。
S303，目标gNB为即将切换过来的UE做准备，同时为UE分配小区标识参数C-RNTI和其他参数，在切换请求确认消息中返回给源gNB。在收到切换请求确认消息后，源gNB准备将分组数据转发给目标gNB。
S304，SgNB向UE发送“切换命令”(Handover Command)(切换命令中包括以下信息：新C-RNTI、目标gNB的SIB、UE的配置信息，如MAC、RLC、PDCP层的配置等)，UE在接收到切换命令后，停止与源gNB的上行或下行数据传输，并向目标gNB进行同步。
此时，源gNB将缓存的UE发来的上行数据和由UPF发来的下行数据转发给目标gNB。
S305，源站向目标站发送SN状态信息，以及数据转发Data forwarding(虚线步骤)。
S306，UE断开与源gNB的数据传输后，启动与目标gNB的下行同步过程，然后发起随机接入过程来获取上行的定时和上行资源分配。目标gNB向UE发送跟踪区TA并向UE指示分给它的资源。这些信息将用于UE向目标gNB发送RRC连接重配置完成消息，以指示切换完成。
S307，UE向目标gNB发送“切换确认”信息，指示切换完成。
S308，目标gNB向源gNB指示切换完成，以便于源gNB释放UE的上下文信息。
同时，目标gNB通知核心网节点更新数据转发目的gNB信息，以便使核心网可以将该UE的数据发送到目标gNB。
现有技术中，在一些多播应用场景中，UE在一个基站下接收多播(组播)业务，在某个时刻发生了移动，需要执行切换流程，切换到另外一个基站去接收多播业务，在两个基站多播业务的进度不一致的时候，现有的切换流程可能会导致UE接收冗余的数据包或者导致UE出现数据中断的情况。如图4所示，图4示出了一种多播业务切换场景400的示意图。 在图4中包括核心网设备410、接入网设备420、接入网设备430、终端设备440和终端设备450。接入网设备420和接入网设备430接收核心网设备410发送的多播业务数据，并发送给其覆盖范围内的终端设备，终端设备450由接入网设备420切换至接入网设备430，接入网设备420和接入网设备430多播业务的进度不一致，现有的切换流程可能会导致终端设备450接收冗余的数据包或者导致终端设备450出现数据中断的情况。
为了解决这一问题，本申请提供了一种通信方法500，下面结合图5详细说明本申请提供的一种通信方法，图5是本申请实施例的一种通信方法500的示意性流程图，该方法500可以应用在图1所示的场景中，当然也可以应用在其他通信场景中，本申请实施例在此不作限制。该方法500中，该第一接入网设备中的第一终端设备由该第一接入网设备切换到该第二接入网设备，该第一接入网设备和该第二接入网设备均进行该第一业务。
应理解，在该第一终端设备切换前后，该第一终端设备采用同一个协议实体对切换前后从该第一接入网设备和该第二接入网设备接收到的数据包进行处理，例如进行排序、重复检测等。
还应理解，在本申请实施例中，以终端设备和接入网设备作为执行方法的执行主体为例，对方法进行说明。作为示例而非限定，执行方法的执行主体也可以是应用于终端设备和接入网设备的芯片、芯片系统、或处理器等。
如图5所示，图5中示出的方法500可以包括S501至S505。下面结合图5详细说明方法500中的各个步骤。
S501，该第一接入网设备向该第二接入网设备转发数据包，该第一接入网设备发送的数据包为该第一业务的数据包。
S502，该第二接入网设备接收该第一接入网设备发送的数据包。
具体而言，在切换过程中，该第一接入网设备需要把核心网设备发送过来的并且没有向该第一终端设备发送成功的数据转发给该第二接入网设备，即数据转发Data forwading过程。由于两个接入网设备的第一协议层的序列号都是根据核心网设备发送的第一指示信息确定的，所以对于内容相同的数据包来说，两个接入网设备确定的第一协议层的序列号相同，所以该第二接入网设备收到该第一接入网设备转发过来的数据包以后，根据数据包的第一协议层的序列号即可知道该第一业务在第一接入网设备的发送进度，即可采取相应的发送策略保证该第一终端设备的业务连续性。
S503，该第二接入网设备根据当前正在向该第一终端设备发送的数据包的第一协议层的第二序列号和接收的该第一接入网设备发送的数据包的第一协议层第一序列号，确定是否向该第一接入网设备发送第三指示信息，该第三指示信息用于指示该第一接入网设备停止向该第二接入网设备转发数据包。
可选的，该第二接入网设备当前正在向该第一终端设备发送的数据包的第一协议层的第二序列号等于或大于该第一接入网设备发送的数据包的第一协议层第一序列号时，该第二接入网设备向该第一接入网设备发送第三指示信息。
可选的，该第二接入网设备当前正在向该第一终端设备发送的数据包的第一协议层的第二序列号为N，该第一接入网设备发送的数据包的第一协议层第一序列号为N-1时，该第二接入网设备向该第一接入网设备发送第三指示信息。
具体而言，终端设备切换成功以后，第二接入网设备开始向终端设备发送第一业务的数据包，同时第一接入网设备向第二接入网设备转发终端没有从第一接入网设备接收成功的第一业务的数据包，当第二接入网设备从第一接入网设备接收到数据包的序列号大于或等于发送给终端设备的数据包的序列号时，指示数据转发停止。对于该第一业 务，假如该第二接入网设备的发送进度快，如图6所示，图6是本申请实施例的一种通信方法的数据转发的示意性流程图，用户面功能接收数据服务器发送的第一业务的数据包，该数据服务器发送该第一业务的数据包时携带了指示信息如业务序列号，用户面功能将接收到的该第一业务的数据包分别向该第一接入网设备和该第二接入网设备发送，但是该用户面功能向该第一接入网设备和该第二接入网设备发送数据包的进度不一致。该第一接入网设备已发送的第一业务的数据包中序列号最大的为SN＝8，而该第二接入网设备已发送的第一业务的数据包中序列号最大的为SN＝11，此时该第一终端设备切换到该第二接入网设备以后，如果按照该第二接入网设备的发送进度接收该第一业务，则会丢失SN为9和10的数据包，所以该第一接入网设备将SN＝9和10的数据包转发给该第二接入网设备。当从该第一接入网设备转发过来的数据包的进度赶上该第二接入网设备的发送进度的时候，即当该第二接入网设备从该第一接入网设备收到的数据包的序列号大于或等于终端设备成功切换到该第二接入网设备以后，该第二接入网设备通过发送的首个第一业务的数据包的SN的时候，该第二接入网设备向该第一接入网设备发送停止指示信息，指示data forwarding结束。
作为一种可选的实现方式，第三指示信息可以包括第一业务的标识信息。
S504，该第一接入网设备接收来自第二接入网设备的该第三指示信息。
S505，该第一接入网设备根据该第三指示信息，停止向该第二接入网设备转发数据包。
具体而言，该第一接入网设备收到指示信息后停止数据转发。在该第一接入网设备接收到目标站的停止指示信息之前，一直进行data forwarding。
因此，在该第一终端设备切换过成中，该第二接入网设备判断该第一接入网设备的数据转发是否可以停止，并向该第一接入网设备发送数据转发停止指示信息，可以保证终端设备在切换过程中，接收多播业务的连续性，避免发生丢包或者冗余传输。
可选的，在步骤S501之前，该方法500还可以包括:
该第二接入网设备接收该第一终端设备发送的数据包的状态报告信息，该数据包的状态报告信息用于指示该第二接入网设备，该第一终端设备已经成功收到的第一业务的数据包和没有成功接收的数据包；
该第二接入网设备根据该状态报告信息，向该第一接入网设备发送第四指示信息，该第四指示信息用于指示该第一接入网设备向该第二接入网设备转发的首个数据包的序列号，该首个数据包是指在data forwarding过程中，该第一接入网设备开始向该第二接入网设备转发的数据包或者所有转发的数据包中序列号最小的数据包；
该第一接入网设备接收该第二接入网设备发送的第四指示信息；
该第一接入网设备根据该第四指示信息，向该第二接入网设备转发数据包。
具体而言，该第一终端设备在切换后向该第二接入网设备发送数据包的状态报告信息，指示该第二接入网设备该第一终端设备成功收到哪些数据包以及哪些数据包没有成功接收，该第二接入网设备收到状态报告信息以后，向该第一接入网设备发送该第四指示信息，该第四指示信息指示该第一终端设备第一个没有收到的数据包的第一协议层的序列号，即该第一接入网设备做数据转发的起始数据包，这样可以避免该第一终端设备接收冗余数据包，即该第一接入网设备发送的数据包虽然被该第一终端设备成功接收，但是依然被该第一接入网设备转发给该第二接入网设备，再由该第二接入网设备发送给该第一终端设备。
本申请提供了一种通信方法600，下面结合图7详细说明本申请提供的一种通信方法，图7是本申请实施例的一种通信方法600的示意性流程图，该方法600可以应用在图1所示的场景中，当然也可以应用在其他通信场景中，本申请实施例在此不作限制。该方法600中，该第一接入网设备中的第一终端设备由该第一接入网设备切换到该第二接入网设备的 过程中，该终端设备同时与第一接入网设备和第二接入网设备保持连接，这样第一接入网设备和第二接入网设备可以同时向终端设备发送第一业务。一方面第一接入网设备可以继续发送终端设备切换前未成功收到的数据包，另一方面终端设备也可以从第二接入网设备接收第一业务的数据包，当从第一接入网设备接收的数据包的序列号可以和从第二接入网设备接收的数据包的序列号连续起来的时候(比如从第一接入网设备收到最大SN为9号数据包，而从第二接入网设备收到最小SN为10的数据包)，第一接入网设备可以停止向终端设备发送数据包，并且可以断开与终端设备的连接。
还应理解，在本申请实施例中，以终端设备和接入网设备作为执行方法的执行主体为例，对方法进行说明。作为示例而非限定，执行方法的执行主体也可以是应用于终端设备和接入网设备的芯片、芯片系统、或处理器等。
如图7所示，图7中示出的方法600可以包括S601至S603。下面结合图7详细说明方法600中的各个步骤。
S601，该第二接入网设备向该第一接入网设备发送第五指示信息，该第五指示信息包括第一序列号N，该第一序列号用于指示该第一终端设备从该第一接入网设备成功切换到该第二接入网设备后，第二接入网设备向第一终端设备发送的第一业务的首个数据包的序列号。
S602，该第一接入网设备接收第二接入网设备发送的第五指示信息。
S603，当该第一接入网设备向该终端设备成功发送的数据包的序列号为N-1时，该第一接入网设备停止向该终端设备发送数据包。
因此，在切换过程中，该第一接入网设备根据该第二接入网设备指示的SN，决定何时停止终端设备的连接，可以保证终端设备在切换过程中，接收多播业务的连续性，避免发生丢包或者冗余传输。
具体而言，在切换过程中该第一终端设备同时从该第一接入网设备和该第二接入网设备接收该第一业务的数据包，该第一接入网设备不用向该第二接入网设备转发该第一业务的数据包，即不需要data forwarding过程，例如在图5中，SN为9和10的数据包，不进行数据转发，直接通过该第一接入网设备发送给该第一终端设备。该第一终端设备成功切换到该第二接入网设备以后，该第二接入网设备可以将发送给该终端设备的第一业务的第一个数据包的SN(例如为11)发送给该第一接入网设备，该第一接入网设备根据该第一个数据包的SN决定何时停止向该第一终端设备发送数据，当该第一接入网设备向该终端设备成功发送的数据包的第一协议层序列号为N-1时，该第一接入网设备停止向该第一终端设备发送数据包，如在图5中，该第一接入网设备发送完11-1＝10号数据包后，断开与该第一终端设备的连接。
可选的，该第一接入网设备向该第二接入网设备发送停止指示信息，指示该第一接入网设备与该第一终端设备断开连接。
可选的，在该终端设备成功切换到该第二接入网设备时，该第二接入网设备可以向该第一接入网设备发送该第一终端设备成功切换的信息，该第一接入网设备接收到该第一终端设备成功切换的信息后，该第一接入网设备将最新发送给该第一终端设备的第一协议层的第一序列号发送给该第二接入网设备，该第二接入网设备根据该第一协议层的第一序列号和该第一协议层的第二序列号确定该第一接入网设备是否停止向该第一终端设备发送第一业务的数据包，该第一协议层的第二序列号是该第一终端设备从该第一接入网设备切换到该第二接入网设备后接收到的来自该第二接入网设备的第一个数据包的第一协议层的序列号。当该第一协议层的第一序列号大于该第一协议层的第二序列号时，该第二接入网设备向第一接入网设备发送指示信息，用于指示第一接入网设备与该第一终端设备断开连接。
可选的，该第二接入网设备向该第一接入网设备发送第五指示信息，该第五指示信息 包括第一序列号N-1，该第一序列号用于指示该第一接入网设备向该终端设备成功发送的数据包的第一协议层序列号为N-1时，该第一接入网设备停止向该终端设备发送数据包。
因此不需要该第一接入网设备再进行计算，直接发到第一序列号为N-1的数据包既可以停止发送。
以上结合图1至图7对本申请实施例的多卡终端设备的通信参数测量方法做了详细说明。以下，结合图8至图10对本申请实施例通信装置进行详细说明。
图8示出了本申请实施例的通信装置700的示意性框图。
一些实施例中，该装置700可以为终端设备，也可以为芯片或电路，比如可设置于终端设备的芯片或电路。
一些实施例中，该装置700可以为接入网设备，也可以为芯片或电路，比如可设置于接入网设备的芯片或电路。
一些实施例中，该装置700可以为核心网设备，也可以为芯片或电路，比如可设置于核心网设备的芯片或电路。
一种可能的方式中，该装置700可以包括处理单元710(即，处理器的一例)和收发单元730。一些可能的实现方式中，处理单元710还可以称为确定单元。一些可能的实现方式中，收发单元730可以包括接收单元和发送单元。
在一种实现方式中，收发单元730可以通过收发器或者收发器相关电路或者接口电路实现。
在一种实现方式中，该装置还可以包括存储单元720。一种可能的方式中，该存储单元720用于存储指令。在一种实现方式中，该存储单元也可以用于存储数据或者信息。存储单元720可以通过存储器实现。
一些可能的设计中，该处理单元710用于执行该存储单元720存储的指令，以使装置700实现如上述方法中终端设备执行的步骤。或者，该处理单元710可以用于调用存储单元720的数据，以使装置700实现如上述方法中终端设备执行的步骤。
一些可能的设计中，该处理单元710用于执行该存储单元720存储的指令，以使装置700实现如上述方法中接入网设备执行的步骤。或者，该处理单元710可以用于调用存储单元720的数据，以使装置700实现如上述方法中接入网设备执行的步骤。
例如，该处理单元710、存储单元720、收发单元730可以通过内部连接通路互相通信，传递控制和/或数据信号。例如，该存储单元720用于存储计算机程序，该处理单元710可以用于从该存储单元720中调用并运行该计算计程序，以控制收发单元730接收信号和/或发送信号，完成上述方法中终端设备或接入网设备的步骤。该存储单元720可以集成在处理单元710中，也可以与处理单元710分开设置。
可选地，若该装置700为通信设备(例如，终端设备，或接入网设备)，该收发单元730包括接收器和发送器。其中，接收器和发送器可以为相同或者不同的物理实体。为相同的物理实体时，可以统称为收发器。
当该装置700为终端设备或者该装置为接入网设备或核心网设备时，收发单元730在发送信息时可以为发送单元或发射器，收发单元730在接收信息时可以为接收单元或接收器，收发单元可以为收发器，此收发器、发射器或接收器可以为射频电路，当该装置包含存储单元时，该存储单元用于存储计算机指令，该处理器与存储器通信连接，处理器执行存储器存储的计算机指令，使该装置可以执行方法200、方法500或者方法600。其中，处 理器可以是一个通用中央处理器(CPU)，微处理器，特定应用集成电路(Application Specific Intergrated Circuit，ASIC)。
可选地，若该装置700为芯片或电路，该收发单元730包括输入接口和输出接口。
当该装置700为芯片时，收发单元730可以是输入和/或输出接口、管脚或电路等。该处理单元710可执行存储单元存储的计算机执行指令，以使该装置可以执行方法200、方法500或者方法600。可选地，所述存储单元为所述芯片内的存储单元，如寄存器、缓存等，所述存储单元还可以是所述终端内的位于所述芯片外部的存储单元，如只读存储器(Read Only Memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(Random Access Memory，RAM)等。
作为一种实现方式，收发单元730的功能可以考虑通过收发电路或者收发的专用芯片实现。处理单元710可以考虑通过专用处理芯片、处理电路、处理单元或者通用芯片实现。
作为另一种实现方式，可以考虑使用通用计算机的方式来实现本申请实施例提供的通信设备(例如终端设备，或接入网设备)。即将实现处理单元710、收发单元730功能的程序代码存储在存储单元720中，通用处理单元通过执行存储单元720中的代码来实现处理单元710、收发单元730的功能。
一些实施例中，装置700可以为接入网设备，该接入如网设备为第一接入网设备，或设置于第一接入网设备的芯片或电路。当装置700为第一接入网设备，或设置于第一接入网设备的芯片或电路时，收发单元730用于接收来自核心网设备的第一数据包以及第一指示信息，该第一指示信息用于指示该第一数据包在至少一个数据包中的顺序；处理单元710用于根据该第一指示信息确定该第一数据包的第一协议层的第一序列号；收发单元730用于将该第一数据包发送给终端设备。
在一种实现方式中，该第一指示信息包含以下信息的至少一种:通用分组无线服务隧道协议-用户面GTP-U序列号、第一业务序列号；该第一业务序列号为该核心网设备或者数据服务器设置的，该第一数据包为第一业务的数据包，该至少一个数据包为第一业务的数据包。
在一种实现方式中，该第一协议层包含以下至少一种：服务数据适配协议SDAP层、分组数据汇聚协议PDCP层和无线链路控制层协议RLC层。
在一种实现方式中，该处理单元710还用于：当该第一协议实体新建、该第一协议实体重建和该第一协议实体恢复时的任一情况发生时，根据该第一指示信息确定该第一数据包的该第一协议层的起始序列号。
在一种实现方式中，该收发单元730还用于：向该终端设备发送第二指示信息，该第二指示信息用于指示在该第一协议实体新建或该第一协议实体重建或该第一协议实体恢复后，该第一接入网设备向该终端设备发送的属于该第一业务的首个数据包的序列号。
在一种实现方式中，该收发单元730还用于：接收来自第二接入网设备的第三指示信息，该第三指示信息用于指示该第一接入网设备停止向该第二接入网设备转发数据包；该处理单元710用于根据该第三指示信息，停止向该第二接入网设备转发数据包。
在一种实现方式中，该收发单元307还用于：接收该第二接入网设备发送的第四指示信息，该第四指示信息用于指示该第一接入网设备向该第二接入网设备转发的首个数据包的序列号；该处理单元710用于根据该第四指示信息，向该第二接入网设备转发数据包。
在一种实现方式中，该收发单元730还用于：接收第二接入网设备发送的第五指示信息，该第五指示信息包括第一序列号N，该第五指示信息包括第二序列号N，该第二序列号用于指示该终端设备切换完成后，该第二接入网设备向该终端设备发送的属于该第一业 务的首个数据包的序列号，该处理单元710用于确定当该第一接入网设备向该终端设备成功发送的数据包对应的协议层序列号为N-1时，停止向该终端设备发送数据包。
当该装置700配置在或本身即为第一接入网设备时，装置700中各模块或单元可以用于执行上述方法中第一接入网设备所执行的各动作或处理过程，这里，为了避免赘述，省略其详细说明。
一些实施例中，装置700可以为终端设备时，或设置于终端设备中的芯片或电路。当装置700为终端设备时，或设置于终端设备中的芯片或电路时，收发单元730用于接收第一接入网设备发送的第二指示信息，该第二指示信息用于指示在该第一协议实体新建或该第一协议实体重建或该第一协议实体恢复后，该第一接入网设备向该终端设备发送的属于第一业务的首个数据包的序列号。
在一种实现方式中，该收发单元730还用于：当该第一协议实体重建或者恢复时，向第一接入网设备发送请求信息，该请求信息用于请求该第一接入网设备发送在该第一协议实体重建或所述第一协议实体恢复后，该第一接入网设备向该终端设备发送的属于第一业务的首个数据包的序列号。
在一种实现方式中，该收发单元730还用于：向第二接入网设备发送数据包的状态报告信息，该数据包的状态报告信息用于指示该第二接入网设备，该终端设备成功收到的数据包和没有成功接收的数据包，其中，该终端设备是由该第一接入网设备切换到该第二接入网设备的。
当该装置700配置在或本身即为终端设备时，装置700中各模块或单元可以用于执行上述方法中第一终端设备所执行的各动作或处理过程，这里，为了避免赘述，省略其详细说明。
一些实施例中，装置700可以为接入网设备，该接入如网设备为第一接入网设备，或设置于第一接入网设备的芯片或电路。当装置700为第一接入网设备，或设置于第一接入网设备的芯片或电路时，收发单元730用于接收来自核心网设备的第一数据包以及第一指示信息，该第一指示信息用于指示该第一数据包在至少一个数据包中的顺序；处理单元710用于根据该第一指示信息确定该第一数据包的第一协议层的第一序列号；收发单元730用于将该第一数据包发送给终端设备。
在一种实现方式中，该第一指示信息包含以下信息的至少一种:通用分组无线服务隧道协议-用户面GTP-U序列号、第一业务序列号；该第一业务序列号为该核心网设备或者数据服务器设置的，该第一数据包为第一业务的数据包，该至少一个数据包为第一业务的数据包。
在一种实现方式中，该第一协议层包含以下至少一种：服务数据适配协议SDAP层、分组数据汇聚协议PDCP层和无线链路控制层协议RLC层。
在一种实现方式中，该处理单元710还用于：当该第一协议实体新建、该第一协议实体重建和该第一协议实体恢复时的任一情况发生时，根据该第一指示信息确定该第一数据包的该第一协议层的起始序列号。
在一种实现方式中，该收发单元730还用于：向该终端设备发送第二指示信息，该第二指示信息用于指示在该第一协议实体新建或该第一协议实体重建或该第一协议实体恢复后，该第一接入网设备向该终端设备发送的属于该第一业务的首个数据包的序列号。
在一种实现方式中，该收发单元730还用于：接收第一接入网设备发送的数据包，
其中，该第一接入网设备中的第二终端设备由该第一接入网设备切换到该第二接入网 设备，该第一终端设备和该第二终端设备均进行该第一业务，该第一接入网设备发送的数据包为该第一业务的数据包；当前正在向该第一终端设备发送的数据包的第一协议层的第二序列号等于或大于该第一接入网设备发送的数据包的第一协议层第一序列号时，向该第一接入网设备发送第三指示信息，该第三指示信息用于指示该第一接入网设备停止向该第二接入网设备转发数据包。
在一种实现方式中，该收发单元730还用于：接收该第二终端设备发送的数据包的状态报告信息，该数据包的状态报告信息用于指示该第二接入网设备，该终端设备成功收到的数据包和没有成功接收的数据包；根据该状态报告信息，向该第一接入网设备发送第四指示信息，该第四指示信息用于指示该第一接入网设备向该第二接入网设备转发的首个数据包的序列号。
在一种实现方式中，该收发单元730还用于：向第一接入网设备发送第五指示信息，该第五指示信息包括第二序列号N，，该第五指示信息包括第二序列号N，该第二序列号用于指示该第二终端设备切换完成后，该第二接入网设备向该第二终端设备发送的属于该第一业务的首个数据包的序列号。
当该装置700配置在或本身即为第二接入网设备时，装置700中各模块或单元可以用于执行上述方法中第二接入网设备所执行的各动作或处理过程，这里，为了避免赘述，省略其详细说明。
一些实施例中，装置700可以为核心网设备，或设置于核心网设备的芯片或电路。当装置700为核心网设备，或设置于核心网设备的芯片或电路时，收发单元730用于接收数据服务器发送的第一数据包；该收发单元730用于向第一接入网设备发送第二数据包以及第一指示信息，该第一指示信息用于指示该第二数据包在核心网设备发送的至少一个数据包中的顺序；该收发单元730用于向第二接入网设备发送第三数据包以及第二指示信息，该第一指示信息用于指示该第三数据包在核心网设备发送的至少一个数据包中的顺序，该第二数据包的数据和该第三数据包的数据与该第一数据包的数据相同。
在一种实现方式中，该第一指示信息包含以下信息的至少一种:通用分组无线服务隧道协议-用户面GTP-U序列号、第一业务序列号；该第一业务序列号为该核心网设备或者数据服务器设置的，该第一数据包为第一业务的数据包，该至少一个数据包为第一业务的数据包。
当该装置700配置在或本身即为核心网设备时，装置700中各模块或单元可以用于执行上述方法中核心网设备所执行的各动作或处理过程，这里，为了避免赘述，省略其详细说明。
该装置700所涉及的与本申请实施例提供的技术方案相关的概念，解释和详细说明及其他步骤请参见前述方法或其他实施例中关于这些内容的描述，此处不做赘述。
图9为本申请提供的一种终端设备800的结构示意图。该终端设备800可以执行上述方法实施例中终端设备执行的动作。
为了便于说明，图9仅示出了终端设备的主要部件。如图9所示，终端设备800包括处理器、存储器、控制电路、天线以及输入输出装置。
处理器主要用于对通信协议以及通信数据进行处理，以及对整个终端设备进行控制，执行软件程序，处理软件程序的数据，例如用于支持终端设备执行上述传输预编码矩阵的指示方法实施例中所描述的动作。存储器主要用于存储软件程序和数据，例如存储上述实 施例中所描述的码本。控制电路主要用于基带信号与射频信号的转换以及对射频信号的处理。控制电路和天线一起也可以叫做收发器，主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。
当终端设备开机后，处理器可以读取存储单元中的软件程序，解释并执行软件程序的指令，处理软件程序的数据。当需要通过无线发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端设备时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。
本领域技术人员可以理解，为了便于说明，图9仅示出了一个存储器和处理器。在实际的终端设备中，可以存在多个处理器和存储器。存储器也可以称为存储介质或者存储设备等，本申请实施例对此不做限制。
例如，处理器可以包括基带处理器和中央处理器，基带处理器主要用于对通信协议以及通信数据进行处理，中央处理器主要用于对整个终端设备进行控制，执行软件程序，处理软件程序的数据。图9中的处理器集成了基带处理器和中央处理器的功能，本领域技术人员可以理解，基带处理器和中央处理器也可以是各自独立的处理器，通过总线等技术互联。本领域技术人员可以理解，终端设备可以包括多个基带处理器以适应不同的网络制式，终端设备可以包括多个中央处理器以增强其处理能力，终端设备的各个部件可以通过各种总线连接。所述基带处理器也可以表述为基带处理电路或者基带处理芯片。所述中央处理器也可以表述为中央处理电路或者中央处理芯片。对通信协议以及通信数据进行处理的功能可以内置在处理器中，也可以以软件程序的形式存储在存储单元中，由处理器执行软件程序以实现基带处理功能。
示例性的，在本申请实施例中，可以将具有收发功能的天线和控制电路视为终端设备800的收发单元810，将具有处理功能的处理器视为终端设备800的处理单元820。如图9所示，终端设备800包括收发单元810和处理单元820。收发单元也可以称为收发器、收发机、收发装置等。可选的，可以将收发单元810中用于实现接收功能的器件视为接收单元，将收发单元810中用于实现发送功能的器件视为发送单元，即收发单元包括接收单元和发送单元。示例性的，接收单元也可以称为接收机、接收器、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。
图10为本申请实施例提供的一种接入网设备900的结构示意图，可以用于实现上述方法中的接入设备(例如，第一接入网设备，第二接入网设备或者第三接入网设备)的功能。接入网设备900包括一个或多个射频单元，如远端射频单元(remote radio unit,RRU)910和一个或多个基带单元(baseband unit，BBU)(也可称为数字单元，digital unit，DU)920。所述RRU910可以称为收发单元、收发机、收发电路、或者收发器等等，其可以包括至少一个天线911和射频单元912。所述RRU910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，例如用于向终端设备发送上述实施例中所述的信令消息。所述BBU920部分主要用于进行基带处理，对基站进行控制等。所述RRU910与BBU920可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。
所述BBU920为基站的控制中心，也可以称为处理单元，主要用于完成基带处理功能，如信道编码，复用，调制，扩频等等。例如该BBU(处理单元)920可以用于控制基站40执行上述方法实施例中关于网络设备的操作流程。
在一个示例中，所述BBU920可以由一个或多个单板构成，多个单板可以共同支持单一接入制式的无线接入网(如LTE系统，或5G系统)，也可以分别支持不同接入制式的无线接入网。所述BBU920还包括存储器921和处理器922。所述存储器921用以存储必要的指令和数据。例如存储器921存储上述实施例中的码本等。所述处理器922用于控制基站进行必要的动作，例如用于控制基站执行上述方法实施例中关于网络设备的操作流程。所述存储器921和处理器922可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
在一种可能的实施方式中，随着片上系统(system-on-chip，SoC)技术的发展，可以将920部分和910部分的全部或者部分功能由SoC技术实现，例如由一颗基站功能芯片实现，该基站功能芯片集成了处理器、存储器、天线接口等器件，基站相关功能的程序存储在存储器中，由处理器执行程序以实现基站的相关功能。可选的，该基站功能芯片也能够读取该芯片外部的存储器以实现基站的相关功能。
应理解，图10示例的接入网设备的结构仅为一种可能的形态，而不应对本申请实施例构成任何限定。本申请并不排除未来可能出现的其他形态的基站结构的可能。
应理解，本申请实施例中，该处理器可以为中央处理单元(central processing unit，CPU)，该处理器还可以是其他通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
还应理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的随机存取存储器(random access memory，RAM)可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。
上述实施例，可以全部或部分地通过软件、硬件、固件或其他任意组合来实现。当使用软件实现时，上述实施例可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令或计算机程序。在计算机上加载或执行所述计算机指令或计算机程序时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机 可以为通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集合的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质。半导体介质可以是固态硬盘。
本申请实施例还提供了一种计算机可读介质，其上存储有计算机程序，该计算机程序被计算机执行时实现上述任一实施例中的终端设备执行的步骤，或者第一接入网设备执行的步骤，或者第二接入网设备执行的步骤，或者核心网设备执行的步骤。
本申请实施例还提供了一种计算机程序产品，该计算机程序产品被计算机执行时实现上述任一实施例中的的终端设备执行的步骤，或者第一接入网设备执行的步骤，或者第二接入网设备执行的步骤，或者核心网设备执行的步骤。
本申请实施例还提供了一种系统芯片，该系统芯片包括：通信单元和处理单元。该处理单元，例如可以是处理器。该通信单元例如可以是通信接口、输入/输出接口、管脚或电路等。该处理单元可执行计算机指令，以使该通信装置内的芯片执行上述本申请实施例提供的终端设备执行的步骤，或者第一接入网设备执行的步骤，或者第二接入网设备执行的步骤，或者核心网设备执行的步骤。
可选地，该计算机指令被存储在存储单元中。
根据本申请实施例提供的方法，本申请实施例还提供一种通信系统，其包括前述的第一接入网设备，第二接入网设备，核心网设备和终端设备。
本申请中的各个实施例可以独立的使用，也可以进行联合的使用，这里不做限定。
另外，本申请的各个方面或特征可以实现成方法、装置或使用标准编程和/或工程技术的制品。本申请中使用的术语“制品”涵盖可从任何计算机可读器件、载体或介质访问的计算机程序。例如，计算机可读介质可以包括，但不限于:磁存储器件(例如，硬盘、软盘或磁带等)，光盘(例如，压缩盘(compact disc，CD)、数字通用盘(digital versatile disc，DVD)等)，智能卡和闪存器件(例如，可擦写可编程只读存储器(erasable programmable read-only memory，EPROM)、卡、棒或钥匙驱动器等)。另外，本文描述的各种存储介质可代表用于存储信息的一个或多个设备和/或其它机器可读介质。术语“机器可读介质”可包括但不限于，无线信道和能够存储、包含和/或承载指令和/或数据的各种其它介质。
应理解，“和/或”，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。字符“/”一般表示前后关联对象是一种“或”的关系。“至少一个”是指一个或一个以上；“A和B中的至少一个”，类似于“A和/或B”，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B中的至少一个，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。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可 以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
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，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。
所述功能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)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请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申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (46)

  1. 一种通信方法，所述方法应用于第一接入网设备，其特征在于，包括：
    接收来自核心网设备的第一数据包以及第一指示信息，所述第一指示信息用于指示所述第一数据包在至少一个数据包中的顺序；
    根据所述第一指示信息确定所述第一数据包的第一协议层的第一序列号；
    将所述第一数据包发送给终端设备。
  2. 根据权利要求1所述的方法，其特征在于，
    所述第一指示信息包含以下信息中的至少一种:
    通用分组无线服务隧道协议-用户面GTP-U序列号、第一业务序列号；
    所述第一业务序列号为所述核心网设备或者数据服务器设置的，所述至少一个数据包为第一业务的数据包。
  3. 根据权利要求1或2所述的方法，其特征在于，所述第一协议层包含以下至少一种：
    服务数据适配协议SDAP层、分组数据汇聚协议PDCP层和无线链路控制层协议RLC层。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，所述方法还包括：
    当所述第一协议实体新建、所述第一协议实体重建和所述第一协议实体恢复时的任一情况发生时，根据所述第一指示信息设置所述第一数据包的所述第一协议层的起始序列号。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述方法还包括：
    向所述终端设备发送第二指示信息，所述第二指示信息用于指示在所述第一协议实体新建或所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于所述第一业务的首个数据包的序列号。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，所述方法还包括：
    接收来自第二接入网设备的第三指示信息，所述第三指示信息用于指示所述第一接入网设备停止向所述第二接入网设备转发数据包；
    根据所述第三指示信息，停止向所述第二接入网设备转发数据包。
  7. 根据权利要求6所述的方法，其特征在于，所述方法还包括：
    接收所述第二接入网设备发送的第四指示信息，所述第四指示信息用于指示所述第一接入网设备向所述第二接入网设备转发的首个数据包的序列号；
    根据所述第四指示信息，向所述第二接入网设备转发数据包。
  8. 根据权利要求1至5中任一项所述的方法，其特征在于，所述方法还包括：
    接收第二接入网设备发送的第五指示信息，所述第五指示信息包括第二序列号N，所述第二序列号用于指示所述终端设备切换完成后，所述第二接入网设备向所述终端设备发送的属于所述第一业务的首个数据包的序列号，
    当所述第一接入网设备向所述终端设备成功发送的数据包的序列号为N-1时，所述第一接入网设备停止向所述终端设备发送数据包。
  9. 一种通信方法，所述方法应用于终端设备，其特征在于，包括：
    接收第一接入网设备发送的第二指示信息，所述第二指示信息用于指示在所述第一协议实体新建或所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于第一业务的首个数据包的序列号。
  10. 根据权利要求9所述的方法，其特征在于，所述方法还包括：
    当所述第一协议实体重建或者恢复时，向第一接入网设备发送请求信息，所述请求信息用于请求所述第一接入网设备发送在所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于第一业务的首个数据包的序列号。
  11. 根据权利要求9或10所述的方法，其特征，所述方法还包括：
    向第二接入网设备发送数据包的状态报告信息，所述数据包的状态报告信息用于指示所述第二接入网设备，所述终端设备成功收到的数据包和没有成功接收的数据包，
    其中，所述终端设备是由所述第一接入网设备切换到所述第二接入网设备的。
  12. 一种通信方法，所述方法应用于第二接入网设备，其特征在于，包括：
    接收来自核心网设备的第一数据包以及第一指示信息，所述第一指示信息用于指示所述第一数据包在至少一个数据包中的顺序；
    根据所述第一指示信息确定所述第一数据包的第一协议层的第二序列号；
    将所述第一数据包发送给第一终端设备。
  13. 根据权利要求12所述的方法，其特征在于，
    所述第一指示信息包含以下信息的至少一种:
    通用分组无线服务隧道协议-用户面GTP-U序列号、第一业务序列号；
    所述第一业务序列号为所述核心网设备或者数据服务器设置的，所述第一数据包为第一业务的数据包，所述至少一个数据包为第一业务的数据包。
  14. 根据权利要求12或13所述的方法，其特征在于，所述第一协议层包含以下至少一种：
    服务数据适配协议SDAP层、分组数据汇聚协议PDCP层和无线链路控制层协议RLC层。
  15. 根据权利要求12至14中任一项所述的方法，其特征在于，所述方法还包括：
    当所述第一协议实体新建、所述第一协议实体重建和所述第一协议实体恢复时的任一情况发生时，根据所述第一指示信息确定所述第一数据包的所述第一协议层的起始序列号。
  16. 根据权利要求12至15中任一项所述的方法，其特征在于，所述方法还包括：
    向所述终端设备发送第二指示信息，所述第二指示信息用于指示在所述第一协议实体新建或所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于所述第一业务的首个数据包的序列号。
  17. 根据权利要求12至15中任一项所述的方法，其特征在于，所述方法还包括：
    接收来自第一接入网设备的数据包，
    其中，所述第一接入网设备中的第二终端设备由所述第一接入网设备切换到所述第二接入网设备，所述第一终端设备和所述第二终端设备均进行所述第一业务，所述第一接入网设备发送的数据包为所述第一业务的数据包；
    当前正在向所述第一终端设备发送的数据包的第一协议层的第二序列号等于或大于所述第一接入网设备发送的数据包的第一协议层第一序列号时，向所述第一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第一接入网设备停止向所述第二接入网设备转发数据包。
  18. 根据权利要求17所述的方法，其特征在于，所述方法还包括：
    接收所述第二终端设备发送的数据包的状态报告信息，所述数据包的状态报告信息用于指示所述第二接入网设备，所述终端设备成功收到的数据包和没有成功接收的数据包；
    根据所述状态报告信息，向所述第一接入网设备发送第四指示信息，所述第四指示信息用于指示所述第一接入网设备向所述第二接入网设备转发的首个数据包的序列号。
  19. 根据权利要求12至15中任一项所述的方法，其特征在于，所述方法还包括：
    向第一接入网设备发送第五指示信息，所述第五指示信息包括第二序列号N，所述第二序列号用于指示所述第二终端设备切换完成后，所述第二接入网设备向所述第二终端设备发送的属于所述第一业务的首个数据包的序列号。
  20. 一种通信方法，所述方法应用于核心网设备，其特征在于，包括：
    接收来自数据服务器的第一数据包；
    向第一接入网设备发送第二数据包以及第一指示信息，所述第一指示信息用于指示所述第二数据包在核心网设备发送的至少一个数据包中的顺序；
    向第二接入网设备发送第三数据包以及第二指示信息，所述第二指示信息用于指示所述第三数据包在核心网设备发送的至少一个数据包中的顺序，
    所述第二数据包的数据、所述第三数据包的数据与所述第一数据包的数据相同。
  21. 根据权利要求20所述的方法，其特征在于，
    所述第一指示信息包含以下信息中的至少一种:
    通用分组无线服务隧道协议-用户面GTP-U序列号、第一业务序列号；
    所述第一业务序列号为所述核心网设备或者数据服务器设置的，所述第一数据包为第一业务的数据包，所述至少一个数据包为第一业务的数据包。
  22. 一种接入网设备，所述接入网设备为第一接入网设备，其特征在于，包括：
    收发单元，用于接收来自核心网设备的第一数据包以及第一指示信息，所述第一指示信息用于指示所述第一数据包在至少一个数据包中的顺序；
    处理单元，用于根据所述第一指示信息确定所述第一数据包的第一协议层的第一序列号；
    所述收发单元，还用于将所述第一数据包发送给终端设备。
  23. 根据权利要求22所述的接入网设备，其特征在于，
    所述第一指示信息包含以下信息的至少一种:
    通用分组无线服务隧道协议-用户面GTP-U序列号、第一业务序列号；
    所述第一业务序列号为所述核心网设备或者数据服务器设置的，所述第一数据包为第一业务的数据包，所述至少一个数据包为所述第一业务的数据包。
  24. 根据权利要求22或23所述的接入网设备，其特征在于，所述第一协议层包含以下至少一种：
    服务数据适配协议SDAP层、分组数据汇聚协议PDCP层和无线链路控制层协议RLC层。
  25. 根据权利要求22至24中任一项所述的接入网设备，其特征在于，所述处理单元还用于：
    当所述第一协议实体新建、所述第一协议实体重建和所述第一协议实体恢复时的任一情况发生时，根据所述第一指示信息确定所述第一数据包的所述第一协议层的起始序列号。
  26. 根据权利要求22至25中任一项所述的接入网设备，其特征在于，所述收发单元还用于：
    向所述终端设备发送第二指示信息，所述第二指示信息用于指示在所述第一协议实体新建或所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于所述第一业务的首个数据包的序列号。
  27. 根据权利要求22至26中任一项所述的接入网设备，其特征在于，所述收发单元还用于：
    接收来自第二接入网设备的第三指示信息，所述第三指示信息用于指示所述第一接入网设备停止向所述第二接入网设备转发数据包；
    所述处理单元还用于根据所述第三指示信息，停止向所述第二接入网设备转发数据包。
  28. 根据权利要求27所述的接入网设备，其特征在于，所述收发单元还用于：
    接收所述第二接入网设备发送的第四指示信息，所述第四指示信息用于指示所述第一接入网设备向所述第二接入网设备转发的首个数据包的序列号；
    所述处理单元还用于根据所述第四指示信息，向所述第二接入网设备转发数据包。
  29. 根据权利要求22至26中任一项所述的接入网设备，其特征在于，所述收发单元 还用于：
    接收第二接入网设备发送的第五指示信息，所述第五指示信息包括第二序列号N，所述第二序列号用于指示所述终端设备切换完成后，所述第二接入网设备向所述终端设备发送的属于所述第一业务的首个数据包的序列号，
    所述处理单元还用于确定当所述第一接入网设备向所述终端设备成功发送的数据包的协议层序列号为N-1时，停止向所述终端设备发送数据包。
  30. 一种终端设备，其特征在于，包括：
    收发单元，用于接收第一接入网设备发送的第二指示信息，所述第二指示信息用于指示在所述第一协议实体新建或所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于第一业务的首个数据包的序列号。
  31. 根据权利要求30所述的终端设备，其特征在于，所述收发单元还用于：
    当所述第一协议实体重建或者恢复时，向第一接入网设备发送请求信息，所述请求信息用于请求所述接入网设备发送在所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于第一业务的首个数据包的序列号。
  32. 根据权利要求30或31所述的终端设备，其特征，所述收发单元还用于：
    向第二接入网设备发送数据包的状态报告信息，所述数据包的状态报告信息用于指示所述第二接入网设备，所述终端设备成功收到的数据包和没有成功接收的数据包，
    其中，所述终端设备是由所述第一接入网设备切换到所述第二接入网设备的。
  33. 一种接入网设备，所述接入网设备为第二接入网设备，其特征在于，包括：
    收发单元，用于接收来自核心网设备的第一数据包以及第一指示信息，所述第一指示信息用于指示所述第一数据包在至少一个数据包中的顺序；
    处理单元，用于根据所述第一指示信息确定所述第一数据包的第一协议层的第二序列号；
    所述收发单元，还用于将所述第一数据包发送给第一终端设备。
  34. 根据权利要求33所述的接入网设备，其特征在于，
    所述第一指示信息包含以下信息中的至少一种:
    通用分组无线服务隧道协议-用户面GTP-U序列号、第一业务序列号；
    所述第一业务序列号为所述核心网设备或者数据服务器设置的，所述第一数据包为第一业务的数据包，所述至少一个数据包为第一业务的数据包。
  35. 根据权利要求33或34所述的接入网设备，其特征在于，所述第一协议层包含以下至少一种：
    服务数据适配协议SDAP层、分组数据汇聚协议PDCP层和无线链路控制层协议RLC层。
  36. 根据权利要求33至35中任一项所述的接入网设备，其特征在于，所述处理单元还用于：
    当所述第一协议实体新建、所述第一协议实体重建和所述第一协议实体恢复时的任一情况发生时，根据所述第一指示信息确定所述第一数据包的所述第一协议层的起始序列号。
  37. 根据权利要求33至36中任一项所述的接入网设备，其特征在于，所述收发单元还用于：
    向所述终端设备发送第二指示信息，所述第二指示信息用于指示在所述第一协议实体新建或所述第一协议实体重建或所述第一协议实体恢复后，所述第一接入网设备向所述终端设备发送的属于所述第一业务的首个数据包的序列号。
  38. 根据权利要求33至37中任一项所述的接入网设备，其特征在于，所述收发单元还用于：
    接收第一接入网设备发送的数据包，
    其中，所述第一接入网设备中的第二终端设备由所述第一接入网设备切换到所述第二接入网设备，所述第一终端设备和所述第二终端设备均进行所述第一业务，所述第一接入网设备发送的数据包为所述第一业务的数据包；
    当前正在向所述第一终端设备发送的数据包的第一协议层的第二序列号等于或大于所述第一接入网设备发送的数据包的第一协议层第一序列号时，向所述第一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第一接入网设备停止向所述第二接入网设备转发数据包。
  39. 根据权利要求38所述的接入网设备，其特征在于，所述收发单元还用于：
    接收所述第二终端设备发送的数据包的状态报告信息，所述数据包的状态报告信息用于指示所述第二接入网设备，所述终端设备成功收到的数据包和没有成功接收的数据包；
    根据所述状态报告信息，向所述第一接入网设备发送第四指示信息，所述第四指示信息用于指示所述第一接入网设备向所述第二接入网设备转发的首个数据包的序列号。
  40. 根据权利要求33至36中任一项所述的接入网设备，其特征在于，所述收发单元还用于：
    向第一接入网设备发送第五指示信息，所述第五指示信息包括第二序列号N，所述第二序列号用于指示所述第二终端设备切换完成后，所述第二接入网设备向所述第二终端设备发送的属于所述第一业务的首个数据包的序列号。
  41. 一种核心网设备，其特征在于，包括：
    收发单元，用于接收数据服务器发送的第一数据包；
    所述收发单元，还用于向第一接入网设备发送第二数据包以及第一指示信息，所述第一指示信息用于指示所述第二数据包在核心网设备发送的至少一个数据包中的顺序；
    所述收发单元用于向第二接入网设备发送第三数据包以及第二指示信息，所述第一指示信息用于指示所述第三数据包在核心网设备发送的至少一个数据包中的顺序，
    所述第二数据包的数据和所述第三数据包的数据与所述第一数据包的数据相同。
  42. 根据权利要求41所述的核心网设备，其特征在于，
    所述第一指示信息包含以下信息的至少一种:
    通用分组无线服务隧道协议-用户面GTP-U序列号、第一业务序列号；
    所述第一业务序列号为所述核心网设备或者数据服务器设置的，所述第一数据包为第一业务的数据包，所述至少一个数据包为第一业务的数据包。
  43. 一种通信装置，包括处理器，所述处理器与存储器相连，所述存储器用于存储计算机程序，所述处理器用于执行所述存储器中存储的计算机程序，以使得所述装置执行如权利要求1至8中任一项所述的方法，或者9至11中任一项所述的方法，或者12至19中任一项所述的方法，或者20至21中任一项所述的方法。
  44. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机程序，当所述计算机程序被运行时，实现如权利要求1至8中任一项所述的方法，或者9至11中任一项所述的方法，或者12至19中任一项所述的方法，或者20至21中任一项所述的方法。
  45. 一种芯片，其特征在于，包括处理器和接口；
    所述处理器用于读取指令以执行权利要求1至8中任一项所述的数据传输的方法，或者9至11中任一项所述的方法，或者12至19中任一项所述的方法，或者20至21中任一项所述的方法。
  46. 一种通信系统，包括权利要求22-29任意一项所述的通信装置、权利要求30-32任意一项所述的通信装置、权利要求33-40任意一项所述的通信装置、权利要求40或41所述的通信装置。
PCT/CN2021/081772 2020-03-20 2021-03-19 一种通信方法、接入网设备、终端设备和核心网设备 WO2021185350A1 (zh)

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EP21771538.2A EP4124107A4 (en) 2020-03-20 2021-03-19 COMMUNICATION METHOD, ACCESS NETWORK DEVICE, TERMINAL DEVICE AND BACKGROUND NETWORK DEVICE
MX2022011639A MX2022011639A (es) 2020-03-20 2021-03-19 Método de comunicación, dispositivo de red de acceso, dispositivo terminal y dispositivo de red básica.
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