WO2018171607A1 - Procédé de communication, unité distribuée et unité de commande - Google Patents

Procédé de communication, unité distribuée et unité de commande Download PDF

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Publication number
WO2018171607A1
WO2018171607A1 PCT/CN2018/079731 CN2018079731W WO2018171607A1 WO 2018171607 A1 WO2018171607 A1 WO 2018171607A1 CN 2018079731 W CN2018079731 W CN 2018079731W WO 2018171607 A1 WO2018171607 A1 WO 2018171607A1
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WO
WIPO (PCT)
Prior art keywords
data
control unit
data packet
information
packet
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Application number
PCT/CN2018/079731
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English (en)
Chinese (zh)
Inventor
王曼
黄曲芳
刘星
罗海燕
酉春华
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华为技术有限公司
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Publication of WO2018171607A1 publication Critical patent/WO2018171607A1/fr

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    • 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1809—Selective-repeat protocols
    • 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
    • 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1806—Go-back-N protocols
    • 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1874—Buffer management
    • 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/188—Time-out mechanisms
    • 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a communication method, a data unit, and a control unit.
  • the Radio Link Control (RLC) layer uses an Automatic Repeat Request (ARQ) mechanism for data transmission. Specifically, when the access network device determines that the polling condition is met, the access network device initiates polling polling to trigger the terminal device to report the RLC data status report according to the polling.
  • the RLC data status report includes: a sequence number (SN) of the RLC data packet that the terminal device has received, and an SN of the RLC data packet that has not been received.
  • the access network device reports retransmission of the discarded RLC data packet according to the RLC data status report.
  • RRC Radio Resource Control
  • PDCP Packet Data Convergence Protocol
  • a similar retransmission mechanism can also be adopted.
  • the access network equipment is divided into two independent units: a CRAN Control Unit (CU) and a Data Unit (Distributed Unit, DU).
  • the CU is also It is called a control node or a central unit.
  • DU is also known as a distributed unit.
  • the CU can perform data processing on the RRC layer and the PDCP layer.
  • the DU can perform data processing on the RLC layer and several protocol layers below the RLC layer.
  • the CU may perform data processing on the RRC layer, the PDCP layer, and the Radio Link Control-High (RLC-H) layer.
  • the DU can perform data processing on the Radio Link Control-Low (RLC-L) layer and several protocol layers below the RLC layer.
  • RLC-L Radio Link Control-Low
  • the current retransmission mechanism is proposed based on the fact that the access network device does not have a CU-DU segmentation. Therefore, how to perform data retransmission based on CU-DU segmentation is an urgent problem to be solved, especially how to obtain data status report is an urgent problem to be solved.
  • the application provides a communication method, a data unit and a control unit. That is to say, based on the scenario of CU-DU segmentation, the present application provides a specific data retransmission method, and in particular, a method for obtaining a data status report.
  • the application provides a communication method, including:
  • the data unit receives the first data packet from the control unit, and the packet header of the first data packet includes first polling indication information
  • the data unit sends a second data packet to the terminal device, where the header of the second data packet includes first polling indication information;
  • the data unit receives the first data status report from the terminal device; wherein the first data status report is used to indicate that the data packet with the packet loss occurs;
  • the data unit sends a second data status report to the control unit; wherein the second data status report is used to indicate that a packet of packet loss has occurred.
  • the present application provides a specific data retransmission method, and in particular, a method for obtaining a first data state report.
  • the method further includes: receiving, by the data unit, priority information of the first data packet from the control unit;
  • the data unit sends the second data packet to the terminal device, including:
  • the data unit preferentially sends the second data packet to the terminal device.
  • the control unit can obtain the second data status report more quickly, thereby improving the data packet retransmission efficiency.
  • the method further includes: the data unit receives the third information from the control unit, where the third information is used to indicate the data packet to be retransmitted.
  • the method further includes: the data unit receives, from the control unit, priority information of the data packet to be retransmitted.
  • the data unit can transmit the priority information of the data packet to be retransmitted according to the priority of the data packet, thereby improving the data packet retransmission efficiency.
  • the application provides a communication method, including:
  • the data unit receives the first data packet from the control unit
  • the data unit If the polling condition is met, the data unit generates a second data packet; the header of the second data packet includes first polling indication information;
  • the data unit sends the second data packet to the terminal device
  • the data unit receives the first data status report from the terminal device; wherein the first data status report is used to indicate that the data packet with the packet loss occurs;
  • the data unit sends a second data status report to the control unit; wherein the second data status report is used to indicate that the packet of the lost packet occurred.
  • the present application provides a specific data retransmission method, and in particular, a method for obtaining a first data state report.
  • the polling condition is:
  • the number of data packets sent by the data unit cumulatively satisfies the first condition
  • the size of the data packet sent by the data unit cumulatively satisfies the second condition
  • the time when the data unit accumulates the data packet is sent to meet the third condition; or,
  • the buffer of the data unit idle satisfies the fourth condition
  • the second data packet is the last data packet to be sent on the data unit.
  • the polling timer of the data unit has timed out.
  • the method further includes: the data unit receives the first information from the control unit, where the first information is used to indicate that the polling condition is met.
  • the polling condition is:
  • the number of data packets sent by the control unit cumulatively satisfies the first condition
  • the size of the data packet sent by the control unit cumulatively satisfies the second condition
  • the cache of the control unit idle satisfies the fourth condition
  • the first data packet is the last data packet to be sent on the control unit.
  • the polling timer of the control unit times out.
  • the method further includes: the data unit receives the second information from the control unit, where the second information is used to indicate to stop sending the first polling indication information.
  • the method further includes: the data unit receives the third information from the control unit, where the third information is used to indicate the data packet to be retransmitted.
  • the method further includes: stopping, by the data unit, the first polling indication information.
  • the method further includes: the data unit receives, from the control unit, priority information of the data packet to be retransmitted.
  • the data unit can transmit the priority information of the data packet to be retransmitted according to the priority of the data packet, thereby improving the data packet retransmission efficiency.
  • the method further includes: when the data unit does not receive the fourth information sent by the control unit, the data unit sends the fifth information to the control unit; the fourth information is used to instruct the control unit to receive the second data status report; The information is used to request the control unit to delete the link between the data unit and the control unit and establish a link with another data unit. Thereby improving data transmission efficiency.
  • the method further includes: the data unit receives the sixth information sent by the control unit; and the sixth information is used to indicate the data packet that is discarded by the control unit.
  • the method further includes: the data unit sends the seventh information to the control unit; the seventh information is used to indicate the data packet discarded by the data unit.
  • the method further includes: the data unit receives the third data packet from the terminal device, where the third data packet includes: second polling indication information;
  • the data unit sends a fourth data packet to the control unit, where the fourth data packet includes: second polling indication information;
  • the data unit receives a third data status report from the control unit; wherein the third data status report is used to indicate that the packet of the lost packet occurs;
  • the data unit sends a fourth data status report to the terminal device; wherein the fourth data status report is used to indicate that the packet of the lost packet occurs.
  • the method further includes: the data unit sends the eighth information to the control unit, where the eighth information is used to indicate the data packet to be segmented;
  • the data unit receives the segmented data packet from the control unit.
  • the method further includes: the data unit receiving control unit sends the ninth information, where the ninth information is used to indicate the fourth data status report;
  • the data unit sends tenth information to the control unit, where the tenth information is used to indicate the data packet to be segmented;
  • the data unit receives the segmented data packet sent by the control unit.
  • the second data status report can be prevented from being cut to improve the reliability of data transmission.
  • the present application provides a communication method, including: if a polling condition is met, the control unit sends a first data packet to a data unit, where a header of the first data packet includes first polling indication information;
  • the control unit receives the second data status report from the data unit; wherein the second data status report is used to indicate that the packet of the lost packet occurred.
  • the polling condition is:
  • the number of data packets sent by the control unit cumulatively satisfies the first condition
  • the size of the data packet sent by the control unit cumulatively satisfies the second condition
  • the cache of the control unit idle satisfies the fourth condition
  • the first data packet is the last data packet to be sent on the control unit.
  • the polling timer of the control unit times out.
  • the method further includes: the control unit sending the priority information of the first data packet to the data unit;
  • the application provides a communication method, including:
  • the control unit sends the first data packet to the data unit
  • the control unit receives the first data status report from the data unit; wherein the first data status report is used to indicate that the packet of the lost packet occurred.
  • the method further includes: the control unit sends the first information to the data unit, where the first information is used to indicate that the polling condition is met.
  • the method further includes: the control unit sends the second information to the data unit, where the second information is used to indicate to stop sending the first polling indication information.
  • the method further includes: the control unit sends fourth information to the data unit, where the fourth information is used to instruct the control unit to receive the second data status report.
  • the method further includes: the control unit sends the fifth information to the data unit; the fifth information is used to request the control unit to delete the link between the data unit and the control unit, and establish a relationship with another data unit Link.
  • the method further includes: the control unit sends the third information to the data unit, where the third information is used to indicate the data packet to be retransmitted.
  • the method further includes: the control unit sends priority information of the data packet to be retransmitted to the data unit.
  • the method further includes: the control unit sends the sixth information to the data unit; the sixth information is used to indicate the data packet that is discarded by the control unit.
  • the method further includes: the control unit receives the seventh information sent by the data unit; and the seventh information is used to indicate the data packet that is discarded by the data unit.
  • the method further includes: the control unit receives the fourth data packet from the data unit, where the fourth data packet includes: the second polling indication information;
  • the control unit sends a second data status report to the data unit.
  • the method further includes: the control unit receives the eighth information from the data unit, where the eighth information is used to indicate the data packet to be segmented;
  • the control unit segments the data packet according to the eighth information
  • the control unit sends the segmented data packet to the data unit.
  • the method further includes: the control unit sends the ninth information to the data unit, where the ninth information is used to indicate the fourth data status report;
  • the control unit receives the tenth information sent by the data unit, and the tenth information is used to indicate the data packet to be segmented;
  • the control unit segments the data packet according to the tenth information
  • the control unit sends the segmented data packet to the data unit.
  • the application provides a data unit, including:
  • a receiving module configured to receive, by the control unit, a first data packet, where a header of the first data packet includes first polling indication information
  • a sending module configured to send a second data packet to the terminal device, where the packet header of the second data packet includes first polling indication information
  • the receiving module is further configured to receive a first data status report from the terminal device, where the first data status report is used to indicate that the data packet with the packet loss occurs;
  • the sending module is further configured to send a second data status report to the control unit, where the second data status report is used to indicate that the packet of the lost packet occurs.
  • the method further includes: a receiving module, configured to receive, by the control unit, priority information of the first data packet;
  • the sending module is specifically configured to: preferentially send the second data packet to the terminal device.
  • the receiving module is further configured to receive third information from the control unit, where the third information is used to indicate a data packet to be retransmitted.
  • the receiving module is further configured to receive, from the control unit, priority information of the data packet to be retransmitted.
  • the application provides a data unit, including:
  • a receiving module configured to receive a first data packet from the control unit
  • a generating module configured to generate a second data packet if the polling condition is met; the packet header of the second data packet includes first polling indication information;
  • a sending module configured to send a second data packet to the terminal device
  • the receiving module is further configured to receive a first data status report from the terminal device, where the first data status report is used to indicate that the data packet with the packet loss occurs;
  • the sending module is further configured to send a second data status report to the control unit, where the second data status report is used to indicate that the packet of the lost packet occurs.
  • the polling condition is:
  • the number of data packets sent by the data unit cumulatively satisfies the first condition
  • the size of the data packet sent by the data unit cumulatively satisfies the second condition
  • the time when the data unit accumulates the data packet is sent to meet the third condition; or,
  • the buffer of the data unit idle satisfies the fourth condition
  • the second data packet is the last data packet to be sent on the data unit; or,
  • the polling timer of the data unit has timed out.
  • the receiving module is further configured to receive first information from the control unit, where the first information is used to indicate that the polling condition is met.
  • the polling condition is:
  • the number of data packets sent by the control unit cumulatively satisfies the first condition
  • the size of the data packet sent by the control unit cumulatively satisfies the second condition
  • the cache of the control unit idle satisfies the fourth condition
  • the first data packet is the last data packet to be sent on the control unit.
  • the polling timer of the control unit times out.
  • the receiving module is further configured to receive second information from the control unit, where the second information is used to indicate to stop sending the first polling indication information.
  • the receiving module is further configured to receive third information from the control unit, where the third information is used to indicate a data packet to be retransmitted.
  • the sending module is further configured to stop sending the first polling indication information.
  • the receiving module is further configured to receive, from the control unit, priority information of the data packet to be retransmitted.
  • the sending module is further configured to: when the receiving module does not receive the fourth information sent by the control unit, send the fifth information to the control unit; the fourth information is used to instruct the control unit to receive the second data status report; The five information is used to request the control unit to delete the link between the data unit and the control unit and establish a link with another data unit.
  • the receiving module is further configured to receive the sixth information sent by the control unit, and the sixth information is used to indicate the data packet that is discarded by the control unit.
  • the sending module is further configured to send the seventh information to the control unit, where the seventh information is used to indicate the data packet discarded by the data unit.
  • the receiving module is further configured to receive, by the terminal device, a third data packet, where the third data packet includes: second polling indication information;
  • the sending module is further configured to send a fourth data packet to the control unit, where the fourth data packet includes: second polling indication information;
  • a receiving module configured to receive a second data status report from the control unit
  • the sending module is further configured to send the second data status report to the terminal device.
  • the sending module is further configured to send the eighth information to the control unit, where the eighth information is used to indicate the data packet to be segmented;
  • the receiving module is further configured to receive the segmented data packet from the control unit.
  • the receiving module is further configured to: the receiving control unit sends the ninth information, where the ninth information is used to indicate the fourth data status report;
  • the sending module is further configured to send tenth information to the control unit, where the tenth information is used to indicate the data packet to be segmented;
  • the receiving module is further configured to receive the segmented data packet sent by the control unit.
  • control unit is described below, and the data unit can be used to perform the third aspect and the third aspect, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • control unit including:
  • a sending module configured to send a first data packet to the data unit if the polling condition is met, where the packet header of the first data packet includes first polling indication information;
  • a receiving module configured to receive a second data status report from the data unit, where the second data status report is used to indicate that the packet of the lost packet occurs.
  • the polling condition is:
  • the number of data packets sent by the control unit cumulatively satisfies the first condition
  • the size of the data packet sent by the control unit cumulatively satisfies the second condition
  • the cache of the control unit idle satisfies the fourth condition
  • the first data packet is the last data packet to be sent on the control unit.
  • the polling timer of the control unit times out.
  • the sending module is further configured to send priority information of the first data packet to the data unit;
  • control unit is described below, and the data unit can be used to perform the fourth and fourth alternatives.
  • the implementation principle and technical effects are similar, and details are not described herein.
  • control unit including:
  • a sending module configured to send the first data packet to the data unit
  • a receiving module configured to receive a second data status report from the data unit, where the second data status report is used to indicate that the packet of the lost packet occurs.
  • the sending module is further configured to send the first information to the data unit, where the first information is used to indicate that the polling condition is met.
  • the sending module is further configured to send the second information to the data unit, where the second information is used to indicate to stop sending the first polling indication information.
  • the sending module is further configured to send fourth information to the data unit, where the fourth information is used to instruct the control unit to receive the first data status report.
  • the sending module is further configured to send the fifth information to the data unit; the fifth information is used to request the control unit to delete the link between the data unit and the control unit, and establish a link with another data unit. .
  • the sending module is further configured to send third information to the data unit, where the third information is used to indicate the data packet to be retransmitted.
  • the sending module is further configured to send, to the data unit, priority information of the data packet to be retransmitted.
  • the sending module is further configured to send the sixth information to the data unit, where the sixth information is used to indicate the data packet that is discarded by the control unit.
  • the receiving module is further configured to receive the seventh information sent by the data unit, where the seventh information is used to indicate the data packet that is discarded by the data unit.
  • the receiving module is further configured to receive the fourth data packet from the data unit, where the fourth data packet includes: second polling indication information;
  • the sending module is further configured to send a second data status report to the data unit.
  • the method further includes: a segmentation module;
  • the receiving module is further configured to receive eighth information from the data unit, where the eighth information is used to indicate the data packet to be segmented;
  • a segmentation module configured to segment the data packet according to the eighth information
  • the sending module is further configured to send the segmented data packet to the data unit.
  • the method further includes: a segmentation module;
  • the sending module is further configured to send the ninth information to the data unit, where the ninth information is used to indicate the fourth data status report;
  • the receiving module is further configured to receive tenth information sent by the data unit, where the tenth information is used to indicate the data packet to be segmented;
  • a segmentation module configured to segment the data packet according to the tenth information
  • the sending module is further configured to send the segmented data packet to the data unit.
  • the embodiment of the present application provides a computer storage medium for storing computer software instructions for use in the foregoing data unit, including a program designed to execute the first aspect.
  • the embodiment of the present application provides a computer storage medium for storing computer software instructions for use in the foregoing data unit, which includes a program designed to execute the foregoing second aspect.
  • the embodiment of the present application provides a computer storage medium for storing computer software instructions used by the control unit, which includes a program designed to execute the third aspect.
  • the embodiment of the present application provides a computer storage medium for storing computer software instructions used by the control unit, which includes a program designed to execute the fourth aspect.
  • the embodiment of the present application provides a computer program product, including instructions, when the computer program is executed by a computer, the instruction causes the computer to execute the data unit executed by the first aspect and the optional method.
  • the embodiment of the present application provides a computer program product, comprising instructions, when executed by a computer, causing a computer to execute the data unit executed by the second aspect and the optional method Features.
  • the embodiment of the present application provides a computer program product, including instructions, when the computer program is executed by a computer, the instruction causes the computer to execute the third aspect and the optional method performed by the control unit Features.
  • the embodiment of the present application provides a computer program product, including instructions, when the computer program is executed by a computer, the instruction causes the computer to execute the fourth aspect and the optional method performed by the control unit Features.
  • the application provides a communication method, a data unit and a control unit.
  • the method includes: the data unit receives the first data packet from the control unit, and the packet header of the first data packet includes first polling indication information.
  • the data unit sends a second data packet to the terminal device, and the header of the second data packet includes first polling indication information.
  • the data unit receives the first data status report from the terminal device; the data unit transmits a second data status report to the control unit.
  • the first data status report and the second data status report are both used to indicate that a packet of packet loss occurs. That is to say, based on the CU-DU segmentation scenario, the present application provides a specific data retransmission method, and in particular, a method for obtaining a second data state report.
  • FIG. 1 is a schematic diagram of a CU-DU segmentation manner according to an embodiment of the present application
  • FIG. 2A is a schematic diagram of connection between a CU and a DU according to an embodiment of the present application
  • 2B is a schematic diagram of connection between a CU and a DU according to another embodiment of the present application.
  • FIG. 3 is an interaction flowchart of a communication method according to Embodiment 1 of the present application.
  • FIG. 4 is a schematic diagram of a format of a data packet according to an embodiment of the present application.
  • FIG. 5 is an interaction flowchart of a communication method according to Embodiment 2 of the present application.
  • FIG. 6 is an interaction flowchart of a communication method according to Embodiment 3 of the present application.
  • FIG. 7 is a schematic structural diagram of a data unit provided by the present application.
  • FIG. 8 is a schematic structural diagram of a data unit provided by the present application.
  • FIG. 9 is a schematic structural diagram of a control unit provided by the present application.
  • FIG. 10 is a schematic structural diagram of a control unit provided by the present application.
  • FIG. 11 is a schematic structural diagram of a control unit provided by the present application.
  • FIG. 12 is a schematic structural diagram of a data unit provided by the present application.
  • FIG. 13 is a schematic structural diagram of a data unit provided by the present application.
  • FIG. 14 is a schematic structural diagram of a control unit provided by the present application.
  • control unit 15 is a schematic structural diagram of a control unit provided by the present application.
  • FIG. 16 is a schematic structural diagram of a control unit provided by the present application.
  • FIG. 1 is a schematic diagram of a CU-DU splitting manner according to an embodiment of the present application, as shown in FIG. 1 .
  • the CU-DU segmentation mode 1 is that the CU can perform data processing on the RRC layer, and the DU can be on the PDCP layer and the RLC layer below the PDCP layer (which may include the RLC-H layer and the RLC-L layer). ), a Media Access Control (MAC) layer (which may include a MAC-H layer and a MAC-L layer), a Physical Layer (PHY) (which may include a PHY-H layer and a PHY-L layer), and Radio frequency (RF) for data processing.
  • MAC Media Access Control
  • PHY Physical Layer
  • RF Radio frequency
  • the CU-DU split mode 2 is that the CU can perform data processing on the RRC layer and the PDCP layer, and the DU can perform data processing on the RLC layer and several protocol layers below the RLC layer.
  • the CU-DU split mode 3 is that the CU can perform data processing on the RRC layer, the PDCP layer, and the RLC-H layer, and the DU can perform data processing on the RLC-L layer and several protocol layers below the RLC layer.
  • the CU-DU split mode 4 is that the CU can perform data processing on the RRC layer, the PDCP layer, and the RLC layer, and the DU can perform data processing on the MAC layer and several protocol layers below the MAC layer.
  • the CU-DU split mode 5 is that the CU can perform data processing on the RRC layer, the PDCP layer, the RLC layer, and the MAC-H layer, and the DU can perform data processing on the MAC-L layer and several protocol layers below the MAC layer.
  • the CU-DU split mode 6 is that the CU can perform data processing on the RRC layer, the PDCP layer, the RLC layer, and the MAC layer, and the DU can perform data processing on the PHY layer and the RF layer.
  • the CU-DU split mode 7 is that the CU can perform data processing on the RRC layer, the PDCP layer, the RLC layer, the MAC layer, and the PHY-H layer, and the DU can perform data processing on the PHY-L layer and the RF layer.
  • the CU-DU split mode 8 is that the CU can perform data processing on the RRC layer, the PDCP layer, the RLC layer, the MAC layer, and the PHY layer, and the DU can perform data processing on the RF layer.
  • the above CU-DU segmentation is performed for the access network device.
  • the CU-DU segmentation can also be applied to the terminal device.
  • the functions of the CU are also different based on different CU-DU segmentation methods.
  • the functions of the DU are not the same based on different CU-DU segmentation methods. details as follows:
  • the CU function All protocol layer functions or partial protocol layer functions of specific existing access network devices.
  • the CU has an RRC function or a partial RRC function.
  • RRC layer and PDCP layer functions Or have RRC layer and PDCP and partial RLC functions.
  • RRC layer and PDCP and partial RLC functions Or have the functions of the RRC layer, the PDCP layer and the MAC layer, and even some or all of the PHY layers.
  • the splitting manner of the CU-DU is not limited to the above manners, and thus the CU function is not limited to this.
  • DU function It has all or part of the protocol layer functions of the existing access network equipment. For example: partial protocol layer functions with RRC layer, PDCP layer, RLC layer, MAC layer and PHY layer. Alternatively, it has functions such as a PDCP layer, an RLC layer, a MAC layer, and a PHY layer. Or have functions such as the RLC layer, the MAC layer, and the PHY layer or include some functions having an RLC layer, a MAC layer, and a PHY layer. Or have all or part of the functionality of the PHY layer.
  • FIG. 2A is a schematic diagram of a connection between a CU and a DU according to an embodiment of the present application. As shown in FIG. 2A, a connection state of a CU and a DU is a single connection state.
  • FIG. 2B is a schematic diagram of a connection between a CU and a DU according to another embodiment of the present application. As shown in FIG. 2B, a connection state of a CU and a DU is in a dual connectivity state. It should be noted that FIGS. 2A and 2B only show a part of the protocol layer. This is just to explain the connection status of the CU and the DU.
  • the CU and DU provided by the present application may be two independent physical devices or two independent logical network elements.
  • the CU can be a large station, a small station, a single board, or a network card.
  • the DU can also be a large station, a small station, a single board, or a network card. This embodiment of the present application does not limit this.
  • a wired connection is made between the CU and the DU through a fiber optic cable or an optical fiber.
  • the interface between the CU and the DU can be called Icu-du.
  • the access network device involved in the present application may be a base station (Base Transceiver Station, BTS for short) in Global System of Mobile communication (GSM) or Code Division Multiple Access (CDMA).
  • BTS Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • the access point (AP) or the relay station may be a base station or the like in the 5G network or the NR, and is not limited herein.
  • the terminal device referred to in this application may be a device that provides voice and/or data connectivity to a user, a handheld device with wireless connectivity, or other processing device that is connected to a wireless modem.
  • the terminal device can communicate with at least one core network via a Radio Access Network (RAN).
  • RAN Radio Access Network
  • the terminal device may be a mobile terminal such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal, for example, a portable, pocket, handheld, computer built-in or vehicle-mounted mobile device. Exchange voice and/or data with a wireless access network.
  • the terminal device may also be referred to as a Subscriber Unit, a Subscriber Station, a Mobile Station, a Mobile Station, a Remote Station, an Access Point, and a remote device.
  • a remote terminal, an access terminal, a user terminal, a user agent, or a user equipment are not limited herein.
  • the present application provides a communication method, a data unit, and a control unit.
  • the technical solution of the present application can be applied not only to a Cloud Radio Access Network (CRAN) communication network, but also to various systems including a part of the function of the access network device, such as Four generations of mobile communication systems (4 Generation, 4G) evolution system, Long Term Evolution (LTE) system, fifth generation mobile communication system (5 Generation, 5G).
  • CRAN Cloud Radio Access Network
  • 4G 4 Generation
  • LTE Long Term Evolution
  • 5G fifth generation mobile communication system
  • the baseband module and the radio frequency module are separated, that is, a radio remote scene, a dual connectivity (DC) scenario, a large and small station scenario, long term evolution and long term evolution, and wireless fidelity aggregation (Long Term) Evolution Wireless Fidelity Aggregarion (LWA) scenario; various non-boundary cell non-cell scenarios, virtualized scenarios, and different system/system coexistence scenarios exist in the 5G system.
  • DC dual connectivity
  • LWA wireless fidelity aggregation
  • FIG. 3 is a flow chart of interaction of a communication method according to Embodiment 1 of the present application. As shown in FIG. 3, the method includes the following process:
  • Step S301 The data unit receives the first data packet from the control unit, and the packet header of the first data packet includes first polling indication information.
  • the control unit determines that the current data transmission state satisfies the polling condition, the control unit generates a first data packet including the first polling indication information, and transmits the first data packet to the data unit.
  • the polling condition is a condition for polling for the second data status report.
  • the first polling indication information is used to indicate that the second data status report is obtained.
  • the control unit may set a fixed location in the first data packet for the first polling indication information. This position can be filled with 0 or 1. When the location is padded to 0, it indicates that the data packet does not carry the first polling indication information, that is, the data packet is a normal data packet.
  • the location When the location is filled with 1, it indicates that the data packet has carried the first polling indication information, that is, the data packet is the first data packet. For example, when the control unit and the data unit negotiate to determine that the first bit position of the data packet header is 1, it indicates that the data packet is the first data packet. And negotiating to determine that the first bit position of the data packet header is 0, indicating that the data packet is a normal data packet.
  • the data unit receives a data packet and identifies that the first bit position is 1, it indicates that the data packet is the first data packet.
  • the location when the location is filled with 1, it indicates that the data packet does not carry the first polling indication information, that is, the data packet is a normal data packet.
  • the location When the location is filled with 0, it indicates that the data packet has carried the first polling indication information, that is, the data packet is the first data packet.
  • the length of the corresponding location of the first polling indication information is not limited to 1 bit, and may be 2 bits or the like. This application does not limit this.
  • Step S302 The data unit sends a second data packet to the terminal device, where the header of the second data packet includes first polling indication information.
  • the second data packet can include a first data packet.
  • the first data packet is a PDCP data packet
  • the second data packet may be an RLC data packet obtained by adding information to the PDCP data packet.
  • the first data packet may also include a second data packet.
  • the second data packet includes only the same sequence number (SN) and the first polling indication information as the first data packet.
  • the first data packet and the second data packet are only the same as the first polling indication information, and other information is different.
  • the second data packet may be a data packet that is sent earliest after the data unit determines that the current data transmission state satisfies the polling condition. Or according to the situation of data packet transmission and/or MAC scheduling, arbitrarily select a data packet to add the first polling indication information as the second data packet, and wait for transmission (may be segmented based on the scheduling result), and finally the first Two data packets are sent to the terminal device.
  • the data unit may send the second data packet according to the MAC scheduling condition and/or the current packet condition.
  • the data unit may send the second data packet into a separate transport block (TB), or may find any one of the packets.
  • PDU Packet Data Unit
  • the present application does not limit the relationship between the first data packet and the second data packet, as long as the first data packet and the second data packet both include the first polling indication information.
  • the purpose of the second data packet sent by the data unit to the terminal device is to send the first polling indication information to the terminal device.
  • the first data packet is an RRC data packet.
  • the second data packet is a PDCP data packet.
  • the first data packet is a PDCP data packet.
  • the second data packet is an RLC data packet.
  • the first data packet is an RLC SDU data packet.
  • the second data packet is an RLC PDU data packet.
  • the first data packet is an RLC data packet.
  • the second data packet is a MAC data packet.
  • the first data packet is a MAC SDU data packet.
  • the second data packet is a MAC PDU data packet.
  • the first data packet is a MAC SDU data packet.
  • the second data packet is a PHY data packet.
  • the data units involved are all physical layer or radio unit related data units.
  • Step S303 The data unit receives the first data status report from the terminal device, where the first data status report is used to indicate that the data packet with the packet loss occurs.
  • Step S304 The data unit sends a second data status report to the control unit.
  • the terminal device sends a first data status report to the data unit.
  • the data unit transmits a second data packet to the terminal device.
  • the second data status report may be the same as the first data status report.
  • the second data status report may be a converted data status report for the first data status report.
  • the second data status report includes: an identifier of the data packet that the terminal device has received and/or an identifier of the data packet that is lost by the terminal device.
  • the control The unit can directly determine the packet that has lost packets.
  • the control unit determines the identifier of the data packet in which the packet loss occurs according to the identifier of the sent data packet and the identifier of the data packet received by the terminal device.
  • the identifier of the data packet may be the SN of the data packet. Of course, it can also be other identifiers of the data packet, as long as the identifier can uniquely identify the data packet.
  • An embodiment of the present application provides a communication method, where the method includes: a data unit receives a first data packet from a control unit, and the data unit sends a second data packet to the terminal device.
  • the header of the first data packet and the header of the second data packet each include first polling indication information.
  • the data unit receives the first data status report from the terminal device; the data unit transmits a second data status report to the control unit.
  • the first data status report and the second data status report are both used to indicate that a packet of packet loss occurs. That is to say, based on the CU-DU segmentation scenario, the present application provides a specific data retransmission method, and in particular, a method for obtaining a second data state report.
  • the polling condition is: the number of data packets sent by the control unit cumulatively satisfies the first condition.
  • the size of the data packet sent by the control unit cumulatively satisfies the second condition.
  • the time when the control unit accumulates the transmission of the data packet satisfies the third condition.
  • the cache of the control unit idle satisfies the fourth condition.
  • the first data packet is the last data packet to be transmitted on the control unit.
  • the polling timer of the control unit times out.
  • the first condition may be that the number of data packets that are sent by the control unit is up to a first preset threshold.
  • the second condition may be that the size of the data packet that is sent by the control unit is up to a second preset threshold.
  • the third condition may be that the control unit accumulates the time when the data packet is sent to reach a third preset threshold.
  • the fourth condition may be that the ratio of the idle buffer size of the control unit to the total cache size is less than a fourth preset threshold, or the ratio of the occupied cache size of the control unit to the total cache size is greater than or equal to a fifth preset threshold.
  • the first preset threshold, the second preset threshold, the third preset threshold, the fourth preset threshold, and the fifth preset threshold may be set according to actual conditions. This embodiment of the present application does not limit this.
  • the communication method further includes: the data unit receives the priority information of the first data packet from the control unit.
  • the data unit sends the second data packet to the terminal device, including: the data unit preferentially sending the second data packet to the terminal device.
  • the data packet sent by the control unit is divided into two cases: the first type is the first data packet, that is, the data packet including the first polling indication information.
  • the second type is a normal data packet, that is, a data packet that does not include the first polling indication information.
  • the control unit can set the priority of the first data packet to be higher than the priority of the normal data packet.
  • the data unit is preferentially sent to the terminal device to send the second data packet.
  • the priority information may be a piece of information that is populated on the idle domain based on the existing data packet. It is also possible to indicate the priority of a packet by augmenting at least one field in the packet.
  • FIG. 4 is a schematic diagram of a format of a data packet according to an embodiment of the present application. As shown in FIG. 4, the present application defines different PDU types to indicate a priority of a data packet. The 4-15 bits of the PDU type can be used as an extension bit, that is, 4-15 bits can represent priority information.
  • the data unit does not receive priority information of the first data packet from the control unit.
  • the data unit may preferentially send the second data packet carrying the first polling indication information.
  • the control unit can obtain the second data status report more quickly, thereby improving the data packet retransmission efficiency.
  • FIG. 5 is a flow chart of interaction of a communication method according to Embodiment 2 of the present application. As shown in FIG. 5, the method includes the following process:
  • Step S501 The data unit receives the first data packet from the control unit.
  • Step S502 If the polling condition is met, the data unit generates a second data packet; the header of the second data packet includes first polling indication information.
  • step S501 and step S502 if the polling condition is satisfied, it means that if the current data transmission state satisfies the polling condition, the polling condition is a condition for polling to acquire the second data status report.
  • the first polling indication information is used to indicate that the second data status report is obtained.
  • the data unit may set a fixed location in the second data packet for the first polling indication information. This position can be filled with 0 or 1. When the location is padded to 0, the terminal device determines that the first data status report does not need to be sent. When the location is filled with 1, the terminal device determines that the first data status report needs to be sent. Alternatively, when the location is filled with 1, the terminal device determines that the first data status report does not need to be sent.
  • the terminal device determines that a first data status report needs to be sent.
  • This application does not limit this.
  • the length of the corresponding location of the first polling indication information is not limited to 1 bit, and may be 2 bits or the like. This application does not limit this.
  • the second data packet can include a first data packet.
  • the first data packet is a PDCP data packet
  • the second data packet may be an RLC data packet obtained by adding information to the PDCP data packet.
  • the first data packet may also include a second data packet.
  • the second data packet only includes: the same SN as the first data packet.
  • the second data packet may be a data packet that is sent earliest after the data unit determines that the current data transmission status satisfies the polling condition.
  • the data unit may send the second data packet according to the MAC scheduling situation or the current grouping situation.
  • the present application does not limit the relationship between the first data packet and the second data packet, and the data unit sends the second data packet to the terminal device for the purpose of: sending the first polling indication information to the terminal device.
  • the first data packet is an RRC data packet.
  • the second data packet is a PDCP data packet.
  • the first data packet is a PDCP data packet.
  • the second data packet is an RLC data packet.
  • the first data packet is an RLC SDU data packet.
  • the second data packet is an RLC PDU data packet.
  • the first data packet is an RLC data packet.
  • the second data packet is a MAC data packet.
  • the first data packet is a MAC SDU data packet.
  • the second data packet is a MAC PDU data packet.
  • the first data packet is a MAC SDU data packet.
  • the second data packet is a PHY data packet.
  • the first data packet is a PHY SDU data packet.
  • the second data packet is a PHY PDU data packet.
  • the first data packet is a PHY data packet.
  • the second data packet is a PHY PDU data packet.
  • the first data packet in the second embodiment is different from the first data packet in the first embodiment and the optional mode in the first embodiment.
  • the first data packet is only a normal data packet, and the data packet does not carry the first polling indication information.
  • the second data packet in the second embodiment is the same as the second data packet in the first embodiment and the optional mode in the first embodiment, and needs to satisfy two conditions: first, the second data packet is a data unit to the terminal. The packet sent by the device.
  • the header of the second data packet includes first polling indication information.
  • Step S503 The data unit sends the second data packet to the terminal device.
  • Step S504 The data unit receives the first data status report from the terminal device, where the first data status report is used to indicate that the data packet with the packet loss occurs.
  • Step S505 The data unit sends a second data status report to the control unit, where the second data status report is used to indicate that the data packet with the packet loss occurs.
  • the terminal device sends a first data status report to the data unit.
  • the data unit sends a second data status report to the control unit.
  • the second data status report includes: an identifier of the data packet that the terminal device has received and/or an identifier of the data packet that is lost by the terminal device.
  • the control The unit can directly determine the packet that has lost packets.
  • the control unit determines the identifier of the data packet in which the packet loss occurs according to the identifier of the sent data packet and the identifier of the data packet received by the terminal device.
  • the identifier of the data packet may be the SN of the data packet. Of course, it can also be other identifiers of the data packet, as long as the identifier can uniquely identify the data packet.
  • the difference between the second embodiment and the first embodiment is that the second embodiment is that the data unit generates the second data packet including the first polling indication information.
  • the obtaining of the second data status report is indicated by the first polling indication information.
  • the control unit generates a first data packet including the first polling indication information.
  • the obtaining of the second data status report is indicated by the first polling indication information.
  • An embodiment of the present application provides a communication method, where the method includes: a data unit receives a first data packet from a control unit, and if a polling condition is met, the data unit generates a second data packet; a packet header of the second data packet includes a first polling Instructions.
  • the data unit transmits a second data packet to the terminal device.
  • the data unit receives the first data status report from the terminal device; wherein the first data status report is used to indicate that the packet of the lost packet occurred.
  • the data unit sends a second data status report to the control unit. That is to say, based on the scenario of CU-DU segmentation, the present application provides a specific data retransmission method, and in particular, a method for obtaining a first data state report.
  • step S502 is divided into two cases:
  • the data unit determines whether the current data transmission status satisfies the polling condition.
  • control unit determines whether the current data transmission status satisfies the polling condition.
  • the polling condition is:
  • the number of data packets sent by the data unit cumulatively satisfies the first condition.
  • the size of the data packet sent by the data unit cumulatively satisfies the second condition.
  • the time when the data unit accumulates the transmission of the data packet satisfies the third condition.
  • the buffer of the data unit idle satisfies the fourth condition.
  • the second data packet is the last data packet to be transmitted on the data unit.
  • the polling timer of the data unit has timed out.
  • the first condition may be that the number of data packets that are sent by the data unit is up to a first preset threshold.
  • the second condition may be that the size of the data packet that is sent by the data unit is up to a second preset threshold.
  • the third condition may be that the data unit accumulates the time when the data packet is sent to reach a third preset threshold.
  • the fourth condition may be that the ratio of the free buffer size of the data unit to the total cache size is less than a fourth preset threshold, or the ratio of the occupied buffer size of the data unit to the total cache size is greater than or equal to a fifth predetermined threshold.
  • the first preset threshold, the second preset threshold, the third preset threshold, the fourth preset threshold, and the fifth preset threshold may be set according to actual conditions. This embodiment of the present application does not limit this.
  • the polling condition is that the number of data packets sent by the control unit cumulatively satisfies the first condition.
  • the size of the data packet sent by the control unit cumulatively satisfies the second condition.
  • the time when the control unit accumulates the transmission of the data packet satisfies the third condition.
  • the cache of the control unit idle satisfies the fourth condition.
  • the first data packet is the last data packet to be transmitted on the control unit.
  • the polling timer of the control unit times out.
  • the first condition may be that the number of data packets that are sent by the control unit is up to a first preset threshold.
  • the second condition may be that the size of the data packet that is sent by the control unit is up to a second preset threshold.
  • the third condition may be that the control unit accumulates the time when the data packet is sent to reach a third preset threshold.
  • the fourth condition may be that the ratio of the idle buffer size of the control unit to the total cache size is less than a fourth preset threshold, or the ratio of the occupied cache size of the control unit to the total cache size is greater than or equal to a fifth preset threshold.
  • the first preset threshold, the second preset threshold, the third preset threshold, the fourth preset threshold, and the fifth preset threshold may be set according to actual conditions. This embodiment of the present application does not limit this.
  • control unit determines that the current data transmission status satisfies the polling condition
  • the control unit transmits first information to the data unit, the first information being used to indicate that the polling condition is satisfied.
  • the control unit determines, according to the second data status report, that the SN of the data packet that the terminal device has received is greater than the SN of the retransmitted data packet, the status report indicating that the data packet before the retransmission data packet has been successfully received.
  • the communication method further includes: the data unit receiving the second information from the control unit, the second information being used to instruct to stop sending the first polling indication information. Specifically, after the control unit receives the second data status report, and the control unit determines that the polling is no longer triggered, the control unit sends the second information to the data unit, so that the first polling indication information is no longer generated, thereby stopping Send the first polling indication message. Thereby preventing the data unit from transmitting unnecessary first polling indication information, thereby saving data unit overhead.
  • the communication method further includes: when the data unit does not receive the fourth information sent by the control unit, the data unit sends the fifth information to the control unit; the fourth information is used to instruct the control unit to receive the second data.
  • the status report; the fifth information is used to request the control unit to delete the link between the data unit and the control unit and establish a link with another data unit.
  • the data unit may regenerate the second data packet. To reacquire the second data status report.
  • the data unit sends the fifth information to the control unit. So that the control unit deletes the link between the data unit and the control unit and establishes a link with another data unit.
  • the data unit when the data unit does not receive the fourth information sent by the control unit, the data unit counts the number of times of sending the same first polling indication information, when the number of times of sending the same first polling indication information is within a preset range, The data unit can regenerate the second data packet. To reacquire the second data status report. When the number of transmissions of the same first polling indication information is not within the preset range, the data unit transmits the fifth information to the control unit. So that the control unit deletes the link between the data unit and the control unit and establishes a link with another data unit.
  • the data unit can send the number of packet retransmissions to the control unit.
  • the control unit deletes the link with the control unit and establishes a link with another data unit.
  • the data unit can send a channel quality parameter to the control unit.
  • the control unit deletes the link with the control unit and establishes a link with another data unit.
  • the channel quality parameter may be a Channel Quality Indicator (CQI) or the like.
  • the control unit determines, according to the identifier of the data packet that the packet is lost, whether the data packet is cached in the data unit or the control unit according to the identifier of the data packet.
  • the control unit retransmits the data packet to be retransmitted to the data unit.
  • the control unit sends third information to the data unit, the third information being used to indicate the data packet to be retransmitted.
  • the data packet to be retransmitted may be a packet in which packet loss occurs, or a packet in which a packet loss occurs. For example, the SN of the packet that has lost packets is 1 and 2, and the SN of the packet to be retransmitted is only 1. Or, the SN of the data packet to be retransmitted is 1 and 2.
  • the method further includes: the data unit receives, from the control unit, priority information of the data packet to be retransmitted.
  • the control unit sets the priority of the data packet to be retransmitted to be higher than the priority of the first transmission data packet.
  • the control unit carries the priority information in the data packet to be retransmitted, and sends the data packet to the data unit.
  • the data unit transmits the priority information of the data packet to the data unit, so that the data unit transmits the data packet according to the priority information.
  • packet 1 is a packet to be retransmitted
  • packet 2 is a packet sent for the first time.
  • the control unit can set the priority of packet 1 to 1, and the priority of packet 2 to 2.
  • the priority information format of the data packet to be retransmitted may also adopt the priority information format of the first data packet. This embodiment of the present application does not limit this.
  • the data unit may put the data packet to be retransmitted into the TB, where the data packet to be retransmitted and the data packet sent for the first time are not TB multiplexed. To ensure that packets that need to be retransmitted are sent preferentially.
  • the data unit may stop sending the first polling indication information.
  • the data unit can transmit the priority information of the data packet to be retransmitted according to the priority of the data packet, thereby improving the data packet retransmission efficiency.
  • the communication method further includes: the data unit receives the sixth information sent by the control unit; the sixth information is used to indicate the data packet that is discarded by the control unit.
  • the control unit discards the PDCP SDU, but due to the PDCP pre-processing, the generated RLC PDU cannot be deleted.
  • the control unit discards the RLC SDU, and the RLC PDU that has been generated at the RLC-L layer cannot be deleted. That is to say, in the case of CU-DU segmentation, as long as the data unit has a buffer area, after the control unit discards the data packet, there is no mechanism to ensure that the data unit can also discard the data. Therefore, when the control unit finds that data congestion occurs in the protocol layer where it is located, the control unit sends the sixth information to the data unit; so that the data unit discards the data packet.
  • the sixth information includes: an SN of the first data packet discarded by the control unit. This situation indicates that the data unit is to discard all packets starting from the SN.
  • the sixth information includes: an SN of the data packet corresponding to the acknowledgement message received by the control unit last time. This case also means that the data unit is to discard all packets after the SN.
  • the sixth information includes: the SN that the control unit receives the data packet corresponding to the acknowledgement message and the SN that does not receive the data packet corresponding to the acknowledgement message.
  • the control unit sends the sixth information in the form of a bitmap, the MAP including the SN of the data packet corresponding to the acknowledgment message and the SN of the data packet corresponding to the acknowledgment message.
  • the sixth information includes: the SN of the data packet discarded by the control unit. So that the data unit discards the data packets corresponding to these SNs.
  • the sixth information may be transmitted through a CU-DU interface control plane or a user plane.
  • the sixth information may be a message populated on the idle domain based on the existing data packet. It is also possible to indicate the priority of a packet by augmenting at least one field in the packet. Similar to the situation shown in FIG. 4, the present application may extend the PDU type in the User Packet-General Packet Radio Service-Userplane (GTP-U) protocol to transmit the sixth information.
  • GTP-U User Packet-General Packet Radio Service-Userplane
  • the communication method further includes: the data unit sends the seventh information to the control unit; the seventh information is used to indicate the data packet discarded by the data unit.
  • the seventh information includes: the SN of the first data packet discarded by the data unit. This situation indicates that the control unit is to discard all packets starting from the SN.
  • the seventh information includes: an SN of the data packet corresponding to the acknowledgement message received by the data unit last time. This case also means that the control unit wants to discard all packets after the SN.
  • the seventh information includes: the SN of the data packet corresponding to the acknowledgment message received by the data unit and the SN of the data packet corresponding to the acknowledgment message not received.
  • the data unit sends the sixth information in the form of a bitmap bitmap, the bitmap includes: an SN of the data packet corresponding to the acknowledgement message and an SN of the data packet corresponding to the acknowledgement message not received.
  • the seventh information includes: the SN of the data packet discarded by the data unit. So that the control unit discards the data packets corresponding to these SNs.
  • the seventh information can be transmitted through the CU-DU interface control plane or the user plane.
  • the seventh information may be a piece of information that is populated on the idle domain on the basis of the existing data packet. It is also possible to indicate the priority of a packet by augmenting at least one field in the packet. For example, similar to the case shown in FIG. 4, the present application may extend the PDU type or reserved field in the GTP-U protocol to send the seventh information. The part of the ellipsis in Figure 4 is the reserved field.
  • control unit mitigates data congestion by transmitting sixth information to the data unit by transmitting the seventh information to the control unit.
  • FIG. 6 is an interaction flowchart of a communication method according to Embodiment 3 of the present application. As shown in FIG. 6, the method includes the following processes:
  • Step S601 The data unit receives the third data packet from the terminal device, where the third data packet includes: second polling indication information.
  • Step S602 The data unit sends a fourth data packet to the control unit, where the fourth data packet includes: second polling indication information.
  • step S601 and step S602 if the terminal device determines that the current data transmission state satisfies the polling condition, the terminal device generates a third data packet including the second polling indication information, and sends the third data packet to the data unit.
  • the polling condition is a condition for polling for the fourth data status report.
  • the second polling indication information is used to indicate that the fourth data status report is obtained.
  • the terminal device can set a fixed location for the second polling indication information. This position can be filled with 0 or 1. When the location is padded to 0, it indicates that the data packet does not carry the second polling indication information, that is, the data packet is a normal data packet.
  • the location When the location is filled with 1, it indicates that the data packet has carried the second polling indication information, that is, the data packet is the third data packet. Alternatively, when the location is filled with 1, it indicates that the data packet does not carry the second polling indication information, that is, the data packet is a normal data packet. When the location is filled with 0, it indicates that the data packet has carried the second polling indication information, that is, the data packet is the third data packet.
  • This application does not limit this.
  • the length of the corresponding location of the second polling indication information is not limited to 1 bit, and may be 2 bits or the like. This application does not limit this.
  • the association between the fourth data packet and the third data packet is that both of the second polling indication information are included.
  • Step S603 The data unit receives the third data status report from the control unit.
  • Step S604 The data unit sends a fourth data status report to the terminal device.
  • the control unit sends a third data status report to the data unit.
  • the data unit sends a fourth data status report to the terminal device.
  • the third data status report and the fourth data status report are both used to indicate that a packet of packet loss occurs.
  • the fourth data status report includes an identifier of the data packet that the control unit has received and/or an identifier of the data packet that the control unit has lost.
  • the terminal The device can directly determine the packet that has lost packets.
  • the terminal device determines the identifier of the data packet in which the packet loss occurs according to the identifier of the sent data packet and the identifier of the data packet received by the control unit.
  • the identifier of the data packet may be the SN of the data packet. Of course, it can also be other identifiers of the data packet, as long as the identifier can uniquely identify the data packet.
  • the third embodiment is similar to the first embodiment and the second embodiment.
  • the difference is that the third embodiment is a process in which the terminal device obtains the data status report, and the first and second embodiments are the processes in which the control unit obtains the data status report. Therefore, the optional manners of the first embodiment and the second embodiment can be applied to the third embodiment accordingly. I will not repeat them here.
  • the access network device obtains a fourth data status report at the RLC-H layer.
  • the data packet is segmented at the RLC-L layer, the segmented data packets are combined at the MAC layer, and the combined data is sent to the PHY layer.
  • the data unit sends indication information to the control unit (corresponding processing RLC-H layer), which may indicate that the data status report of the RLC-H layer is segmented.
  • the present application provides two alternatives.
  • the communication method further includes: the data unit sending the eighth information to the control unit, where the eighth information is used to indicate the data packet to be segmented.
  • the data unit receives the segmented data packet from the control unit.
  • the control unit determines, according to the eighth information, whether the data packet to be segmented is a fourth data status report, and if it is determined to be the fourth data status report, the control unit determines the previous or next data packet of the fourth data status report, and The previous or next data packet is segmented, and the segmented data packet and the fourth data status report are sent to the data unit.
  • the data unit is combined with the segmented data packet and the fourth data status report.
  • the communication method further includes: the data unit receiving control unit sends the ninth information, where the ninth information is used to indicate the fourth data status report.
  • the data unit sends tenth information to the control unit, the tenth information being used to indicate the data packet to be segmented.
  • the data unit receives the segmented data packet sent by the control unit. That is, the control unit sends the ninth information to the data unit, so that the data unit knows which is the fourth data status report. In this case, the tenth information sent by the data unit to the control unit does not include the fourth data status report. SN, thereby avoiding the fourth data status report being cut.
  • the data unit can delete the old fourth data status report and retain only the latest fourth data status report. Alternatively, the data unit reserves the location of the fourth data status report to avoid segmentation of the fourth data status report.
  • the fourth data status report can be prevented from being cut to improve the reliability of data transmission.
  • FIG. 7 is a schematic structural diagram of a data unit provided by the present application. As shown in FIG. 7, the data unit includes:
  • the receiving module 71 is configured to receive a first data packet from the control unit, where a header of the first data packet includes first polling indication information.
  • the sending module 72 is configured to send a second data packet to the terminal device, where the packet header of the second data packet includes the first polling indication information.
  • the receiving module 71 is further configured to receive a first data status report from the terminal device, where the first data status report is used to indicate that a packet of packet loss occurs.
  • the sending module 72 is further configured to send the second data status report to the control unit, where the second data status report is used to indicate that a packet of packet loss occurs.
  • the data unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the data unit in the optional manners of the first embodiment and the first embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • the receiving module 71 is further configured to receive priority information of the first data packet from the control unit.
  • the sending module 72 is specifically configured to: preferentially send the second data packet to the terminal device.
  • the receiving module 71 is further configured to receive third information from the control unit, where the third information is used to indicate a data packet to be retransmitted.
  • the receiving module 71 is further configured to receive, from the control unit, priority information of the data packet to be retransmitted.
  • the data unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the data unit in the optional manners of the first embodiment and the first embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 8 is a schematic structural diagram of a data unit provided by the present application. As shown in Figure 8, the data unit includes:
  • the receiving module 81 is configured to receive the first data packet from the control unit.
  • the generating module 82 is configured to generate a second data packet if the polling condition is met; the packet header of the second data packet includes first polling indication information.
  • the sending module 83 is configured to send the second data packet to the terminal device.
  • the receiving module 81 is further configured to receive a first data status report from the terminal device, where the first data status report is used to indicate that a packet of packet loss occurs.
  • the sending module 83 is further configured to send the second data status report to the control unit, where the second data status report is used to indicate that a packet of packet loss occurs.
  • the data unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the data unit in the optional manners of the second embodiment and the second embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • the polling condition is:
  • the number of data packets sent by the data unit cumulatively satisfies the first condition
  • the size of the data packet sent by the data unit cumulatively satisfies the second condition
  • the cache of the data unit idle satisfies the fourth condition
  • the second data packet is the last data packet to be sent on the data unit.
  • the polling timer of the data unit expires.
  • the receiving module 81 is further configured to receive first information from the control unit, where the first information is used to indicate that the polling condition is met.
  • the polling condition is:
  • the number of data packets sent by the control unit cumulatively satisfies the first condition
  • the size of the data packet sent by the control unit cumulatively satisfies the second condition
  • the cache of the control unit idle satisfies the fourth condition
  • the first data packet is the last data packet to be sent on the control unit.
  • the polling timer of the control unit expires.
  • the receiving module 81 is further configured to receive second information from the control unit, where the second information is used to indicate to stop sending the first polling indication information.
  • the receiving module 81 is further configured to receive third information from the control unit, where the third information is used to indicate a data packet to be retransmitted.
  • the sending module 83 is further configured to stop sending the first polling indication information.
  • the receiving module 81 is further configured to receive, from the control unit, priority information of the data packet to be retransmitted.
  • the sending module 83 is further configured to: when the receiving module does not receive the fourth information sent by the control unit, send the fifth information to the control unit; the fourth information is used to indicate Receiving, by the control unit, the second data status report; the fifth information is used to request the control unit to delete a link between the data unit and the control unit, and establish a relationship with another data unit The link between.
  • the receiving module 81 is further configured to receive sixth information sent by the control unit, where the sixth information is used to indicate a data packet that is discarded by the control unit.
  • the sending module 83 is further configured to send seventh information to the control unit, where the seventh information is used to indicate a data packet that is discarded by the data unit.
  • the data unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the data unit in the optional manners of the second embodiment and the second embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • the receiving module 81 is further configured to receive a third data packet from the terminal device, where the third data packet includes: second polling indication information.
  • the sending module 83 is further configured to send a fourth data packet to the control unit, where the fourth data packet includes: the second polling indication information.
  • the receiving module 81 is further configured to receive a third data status report from the control unit, where the third data status report is used to indicate that a packet of packet loss occurs;
  • the sending module 83 is further configured to send the fourth data status report to the terminal device, where the fourth data status report is used to indicate that a packet of packet loss occurs.
  • the sending module 83 is further configured to send, to the control unit, eighth information, where the eighth information is used to indicate a data packet to be segmented.
  • the receiving module 81 is further configured to receive the segmented data packet from the control unit.
  • the receiving module 81 is further configured to receive, by the control unit, ninth information, where the ninth information is used to indicate the fourth data status report.
  • the sending module 83 is further configured to send tenth information to the control unit, where the tenth information is used to indicate a data packet to be segmented.
  • the receiving module 81 is further configured to receive the segmented data packet sent by the control unit.
  • the data unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the data unit in the optional manners of the third embodiment and the third embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 9 is a schematic structural diagram of a control unit provided by the present application. As shown in FIG. 9, the control unit includes:
  • the sending module 91 is configured to send a first data packet to the data unit if the polling condition is met, where the header of the first data packet includes first polling indication information;
  • the receiving module 92 is configured to receive a second data status report from the data unit, where the second data status report is used to indicate that a packet of packet loss occurs.
  • control unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the control unit in the optional manners of the first embodiment and the first embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • the polling condition is:
  • the number of data packets sent by the control unit cumulatively satisfies the first condition
  • the size of the data packet sent by the control unit cumulatively satisfies the second condition
  • the cache of the control unit idle satisfies the fourth condition
  • the first data packet is the last data packet to be sent on the control unit.
  • the polling timer of the control unit expires.
  • the sending module 91 is further configured to send, to the data unit, priority information of the first data packet;
  • control unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the control unit in the optional manners of the first embodiment and the first embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 10 is a schematic structural diagram of a control unit provided by the present application. As shown in FIG. 10, the control unit includes:
  • the sending module 1001 is configured to send the first data packet to the data unit.
  • the receiving module 1002 is configured to receive a second data status report from the data unit, where the second data status report is used to indicate that a packet of packet loss occurs.
  • control unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the control unit in the optional manners of the second embodiment and the second embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • the sending module 1001 is further configured to send, to the data unit, first information, where the first information is used to indicate that a polling condition is met.
  • the sending module 1001 is further configured to send, to the data unit, second information, where the second information is used to indicate to stop sending the first polling indication information.
  • the sending module 1001 is further configured to send fourth information to the data unit, where the fourth information is used to instruct the control unit to receive the second data status report.
  • the receiving module 1002 is further configured to receive fifth information sent by the data unit, where the fifth information is used to request the control unit to delete a chain between the data unit and the control unit. Road and establish a link with another data unit.
  • the sending module 1001 is further configured to send, to the data unit, third information, where the third information is used to indicate a data packet to be retransmitted.
  • the sending module 1001 is further configured to send, to the data unit, priority information of the data packet to be retransmitted.
  • the sending module 1001 is further configured to send sixth information to the data unit, where the sixth information is used to indicate a data packet that is discarded by the control unit.
  • the receiving module 1001 is further configured to receive seventh information sent by the data unit, where the seventh information is used to indicate a data packet that is discarded by the data unit.
  • control unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the control unit in the optional manners of the second embodiment and the second embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 11 is a schematic structural diagram of a control unit provided by the present application. As shown in FIG. 11, the control unit includes:
  • the receiving module 1101 is further configured to receive a fourth data packet from the data unit, where the fourth data packet includes: the second polling indication information.
  • the sending module 1102 is further configured to send a third data status report to the data unit.
  • the method further includes: a segmentation module 1103.
  • the receiving module 1101 is further configured to receive eighth information from the data unit, where the eighth information is used to indicate a data packet to be segmented.
  • the segmentation module 1103 is configured to segment the data packet according to the eighth information.
  • the sending module 1102 is further configured to send the segmented data packet to the data unit.
  • the sending module 1102 is further configured to send, to the data unit, ninth information, where the ninth information is used to indicate the fourth data status report.
  • the receiving module 1101 is further configured to receive tenth information sent by the data unit, where the tenth information is used to indicate a data packet to be segmented.
  • the segmentation module 1103 is configured to segment the data packet according to the tenth information.
  • the sending module 1102 is further configured to send the segmented data packet to the data unit.
  • control unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the control unit in the optional manners of the third embodiment and the third embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 12 is a schematic structural diagram of a data unit provided by the present application. As shown in FIG. 12, the data unit includes:
  • the receiver 1201 is configured to receive a first data packet from the control unit, where a header of the first data packet includes first polling indication information.
  • the transmitter 1202 is configured to send a second data packet to the terminal device, where the packet header of the second data packet includes the first polling indication information.
  • the receiver 1201 is further configured to receive a first data status report from the terminal device, where the first data status report is used to indicate that a packet of packet loss occurs.
  • the transmitter 1202 is further configured to send the second data status report to the control unit, where the second data status report is used to indicate that a packet of packet loss occurs.
  • the data unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the data unit in the optional manners of the first embodiment and the first embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • the receiver 1201 is further configured to receive priority information of the first data packet from the control unit.
  • the transmitter 1202 is specifically configured to: preferentially send the second data packet to the terminal device.
  • the receiver 1201 is further configured to receive third information from the control unit, where the third information is used to indicate a data packet to be retransmitted.
  • the receiver 1201 is further configured to receive, from the control unit, priority information of the data packet to be retransmitted.
  • the data unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the data unit in the optional manners of the first embodiment and the first embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 13 is a schematic structural diagram of a data unit provided by the present application. As shown in FIG. 13, the data unit includes:
  • the receiver 1301 is configured to receive the first data packet from the control unit.
  • the processor 1302 is configured to generate a second data packet if the polling condition is met; the packet header of the second data packet includes first polling indication information.
  • the transmitter 1303 is configured to send the second data packet to the terminal device.
  • the receiver 1301 is further configured to receive a first data status report from the terminal device, where the first data status report is used to indicate that a packet of packet loss occurs.
  • the transmitter 1303 is further configured to send the second data status report to the control unit, where the second data status report is used to indicate that a packet of packet loss occurs.
  • the data unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the data unit in the optional manners of the second embodiment and the second embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • the polling condition is:
  • the number of data packets sent by the data unit cumulatively satisfies the first condition
  • the size of the data packet sent by the data unit cumulatively satisfies the second condition
  • the cache of the data unit idle satisfies the fourth condition
  • the second data packet is the last data packet to be sent on the data unit.
  • the polling timer of the data unit expires.
  • the receiver 1301 is further configured to receive first information from the control unit, where the first information is used to indicate that the polling condition is met.
  • the polling condition is:
  • the number of data packets sent by the control unit cumulatively satisfies the first condition
  • the size of the data packet sent by the control unit cumulatively satisfies the second condition
  • the cache of the control unit idle satisfies the fourth condition
  • the first data packet is the last data packet to be sent on the control unit.
  • the polling timer of the control unit expires.
  • the receiver 1301 is further configured to receive second information from the control unit, where the second information is used to indicate to stop sending the first polling indication information.
  • the receiver 1301 is further configured to receive third information from the control unit, where the third information is used to indicate a data packet to be retransmitted.
  • the transmitter 1303 is further configured to stop sending the first polling indication information.
  • the receiver 1301 is further configured to receive, from the control unit, priority information of the data packet to be retransmitted.
  • the transmitter 1303 is further configured to: when the receiving module does not receive the fourth information sent by the control unit, send the fifth information to the control unit; the fourth information is used to indicate Receiving, by the control unit, the second data status report; the fifth information is used to request the control unit to delete a link between the data unit and the control unit, and establish a relationship with another data unit The link between.
  • the receiver 1301 is further configured to receive sixth information sent by the control unit, where the sixth information is used to indicate a data packet that is discarded by the control unit.
  • the transmitter 1303 is further configured to send seventh information to the control unit, where the seventh information is used to indicate a data packet that is discarded by the data unit.
  • the data unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the data unit in the optional manners of the second embodiment and the second embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • the receiver 1301 is further configured to receive a third data packet from the terminal device, where the third data packet includes: second polling indication information.
  • the transmitter 1303 is further configured to send a fourth data packet to the control unit, where the fourth data packet includes: the second polling indication information.
  • the receiver 1301 is further configured to receive a third data status report from the control unit, where the third data status report is used to indicate that a packet of packet loss occurs;
  • the transmitter 1303 is further configured to send the fourth data status report to the terminal device, where the fourth data status report is used to indicate that a packet of packet loss occurs.
  • the transmitter 1303 is further configured to send, to the control unit, eighth information, where the eighth information is used to indicate a data packet to be segmented.
  • the receiver 1301 is further configured to receive the segmented data packet from the control unit.
  • the receiver 1301 is further configured to receive, by the control unit, ninth information, where the ninth information is used to indicate the fourth data status report.
  • the transmitter 1303 is further configured to send tenth information to the control unit, where the tenth information is used to indicate a data packet to be segmented.
  • the receiver 1301 is further configured to receive the segmented data packet sent by the control unit.
  • the data unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the data unit in the optional manners of the third embodiment and the third embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 14 is a schematic structural diagram of a control unit provided by the present application. As shown in FIG. 14, the control unit includes:
  • the transmitter 1401 is configured to send a first data packet to the data unit if the polling condition is met, where the header of the first data packet includes first polling indication information.
  • the receiver 1402 is configured to receive a second data status report from the data unit, where the second data status report is used to indicate that a packet of packet loss occurs.
  • control unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the control unit in the optional manners of the first embodiment and the first embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • the polling condition is:
  • the number of data packets sent by the control unit cumulatively satisfies the first condition
  • the size of the data packet sent by the control unit cumulatively satisfies the second condition
  • the cache of the control unit idle satisfies the fourth condition
  • the first data packet is the last data packet to be sent on the control unit.
  • the polling timer of the control unit expires.
  • the sender 1401 is further configured to send priority information of the first data packet to the data unit;
  • control unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the control unit in the optional manners of the first embodiment and the first embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 15 is a schematic structural diagram of a control unit provided by the present application. As shown in FIG. 15, the control unit includes:
  • a transmitter 1501 configured to send a first data packet to the data unit
  • the receiver 1502 is configured to receive a second data status report from the data unit, where the second data status report is used to indicate that a packet of packet loss occurs.
  • control unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the control unit in the optional manners of the second embodiment and the second embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • the sender 1501 is further configured to send, to the data unit, first information, where the first information is used to indicate that a polling condition is met.
  • the transmitter 1501 is further configured to send, to the data unit, second information, where the second information is used to indicate to stop sending the first polling indication information.
  • the transmitter 1501 is further configured to send fourth information to the data unit, where the fourth information is used to instruct the control unit to receive the second data status report.
  • the receiver 1502 is further configured to receive fifth information sent by the data unit, where the fifth information is used to request the control unit to delete a chain between the data unit and the control unit. Road and establish a link with another data unit.
  • the sender 1501 is further configured to send, to the data unit, third information, where the third information is used to indicate a data packet to be retransmitted.
  • the sender 1501 is further configured to send, to the data unit, priority information of the data packet to be retransmitted.
  • the transmitter 1501 is further configured to send sixth information to the data unit, where the sixth information is used to indicate a data packet that is discarded by the control unit.
  • the receiver 1502 is further configured to receive seventh information sent by the data unit, where the seventh information is used to indicate a data packet that is discarded by the data unit.
  • control unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the control unit in the optional manners of the second embodiment and the second embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 16 is a schematic structural diagram of a control unit provided by the present application. As shown in FIG. 16, the control unit includes:
  • the receiver 1601 is further configured to receive a fourth data packet from the data unit, where the fourth data packet includes: the second polling indication information.
  • the transmitter 1602 is further configured to send a third data status report to the data unit.
  • the method further includes: a processor 1603.
  • the receiver 1601 is further configured to receive eighth information from the data unit, where the eighth information is used to indicate a data packet to be segmented.
  • the processor 1603 is configured to segment the data packet according to the eighth information.
  • the transmitter 1602 is further configured to send the segmented data packet to the data unit.
  • the transmitter 1602 is further configured to send, to the data unit, ninth information, where the ninth information is used to indicate the fourth data status report.
  • the receiver 1601 is further configured to receive tenth information sent by the data unit, where the tenth information is used to indicate a data packet to be segmented.
  • the processor 1603 is configured to segment the data packet according to the tenth information.
  • the transmitter 1602 is further configured to send the segmented data packet to the data unit.
  • control unit provided by the embodiment of the present application may be used to perform the actions or steps performed by the control unit in the optional manners of the third embodiment and the third embodiment.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • Embodiment 1 A communication method, comprising:
  • control unit sends a first data packet to the data unit, where the header of the first data packet includes first polling indication information;
  • the control unit receives a second data status report from the data unit; wherein the second data status report is used to indicate that a packet of packet loss has occurred.
  • Embodiment 2 The method according to Embodiment 1, wherein the polling condition is:
  • the number of data packets sent by the control unit cumulatively satisfies the first condition
  • the size of the data packet sent by the control unit cumulatively satisfies the second condition
  • the cache of the control unit idle satisfies the fourth condition
  • the first data packet is the last data packet to be sent on the control unit.
  • the polling timer of the control unit expires.
  • the control unit sends priority information of the first data packet to the data unit.
  • Embodiment 4 A communication method, comprising:
  • the control unit sends the first data packet to the data unit
  • the control unit receives a second data status report from the data unit; wherein the second data status report is used to indicate that a packet of packet loss has occurred.
  • the control unit sends first information to the data unit, the first information being used to indicate that a polling condition is satisfied.
  • the control unit sends second information to the data unit, where the second information is used to indicate to stop sending the first polling indication information.
  • the control unit sends fourth information to the data unit, where the fourth information is used to instruct the control unit to receive the second data status report.
  • the control unit receives fifth information sent by the data unit; the fifth information is used to request the control unit to delete a link between the data unit and the control unit, and establish another data unit with another The link between.
  • the control unit sends third information to the data unit, where the third information is used to indicate a data packet to be retransmitted.
  • the control unit sends priority information of the data packet to be retransmitted to the data unit.
  • the control unit sends sixth information to the data unit; the sixth information is used to indicate a data packet discarded by the control unit.
  • the control unit receives seventh information sent by the data unit; the seventh information is used to indicate a data packet that is discarded by the data unit.
  • the control unit receives a fourth data packet from the data unit, where the fourth data packet includes: the second polling indication information;
  • the control unit sends a third data status report to the data unit.
  • the control unit receives eighth information from the data unit, where the eighth information is used to indicate a data packet to be segmented;
  • the control unit segments the data packet according to the eighth information
  • the control unit sends the segmented data packet to the data unit.
  • the control unit sends ninth information to the data unit, where the ninth information is used to indicate the fourth data status report;
  • the control unit receives tenth information sent by the data unit, where the tenth information is used to indicate a data packet to be segmented;
  • the control unit segments the data packet according to the tenth information
  • the control unit sends the segmented data packet to the data unit.
  • Embodiment 16 a control unit, comprising:
  • a sending module configured to send a first data packet to the data unit if the polling condition is met, where the header of the first data packet includes first polling indication information
  • a receiving module configured to receive a second data status report from the data unit, where the second data status report is used to indicate that a packet of packet loss occurs.
  • Embodiment 17 The control unit of embodiment 16, wherein the polling condition is:
  • the number of data packets sent by the control unit cumulatively satisfies the first condition
  • the size of the data packet sent by the control unit cumulatively satisfies the second condition
  • the cache of the control unit idle satisfies the fourth condition
  • the first data packet is the last data packet to be sent on the control unit.
  • the polling timer of the control unit expires.
  • Embodiment 18 The control unit according to embodiment 16 or 17, wherein
  • the sending module is further configured to send priority information of the first data packet to the data unit.
  • Embodiment 19 A control unit, comprising:
  • a sending module configured to send the first data packet to the data unit
  • a receiving module configured to receive a second data status report from the data unit, where the second data status report is used to indicate that a packet of packet loss occurs.
  • Embodiment 20 The control unit according to embodiment 19, characterized in that
  • the sending module is further configured to send first information to the data unit, where the first information is used to indicate that a polling condition is met.
  • Embodiment 21 The control unit according to embodiment 19 or 20, characterized in that
  • the sending module is further configured to send second information to the data unit, where the second information is used to indicate to stop sending the first polling indication information.
  • Embodiment 22 The control unit of any of embodiments 19-21, wherein
  • the sending module is further configured to send fourth information to the data unit, where the fourth information is used to instruct the control unit to receive the second data status report.
  • control unit according to any one of embodiments 19-21, characterized in that
  • the receiving module is further configured to receive fifth information sent by the data unit, where the fifth information is used to request the control unit to delete a link between the data unit and the control unit, and establish and The link between another data unit.
  • Embodiment 24 The control unit of any of embodiments 19-23, wherein
  • the sending module is further configured to send third information to the data unit, where the third information is used to indicate a data packet to be retransmitted.
  • Embodiment 25 The control unit of embodiment 24, wherein
  • the sending module is further configured to send, to the data unit, priority information of the data packet to be retransmitted.
  • control unit according to any one of embodiments 19-25, characterized in that
  • the sending module is further configured to send sixth information to the data unit, where the sixth information is used to indicate a data packet that is discarded by the control unit.
  • Embodiment 27 The control unit of any of embodiments 19-26, wherein
  • the receiving module is further configured to receive seventh information sent by the data unit, where the seventh information is used to indicate a data packet that is discarded by the data unit.
  • control unit according to any one of embodiments 19-27, characterized in that
  • the receiving module is further configured to receive a fourth data packet from the data unit, where the fourth data packet includes: the second polling indication information;
  • the sending module is further configured to send a third data status report to the data unit.
  • control unit of embodiment 28, further comprising: a segmentation module
  • the receiving module is further configured to receive eighth information from the data unit, where the eighth information is used to indicate a data packet to be segmented;
  • the segmentation module is configured to segment the data packet according to the eighth information
  • the sending module is further configured to send the segmented data packet to the data unit.
  • control unit of embodiment 28, further comprising: a segmentation module
  • the sending module is further configured to send, to the data unit, ninth information, where the ninth information is used to indicate the fourth data status report;
  • the receiving module is further configured to receive tenth information sent by the data unit, where the tenth information is used to indicate a data packet to be segmented;
  • the segmentation module is configured to segment the data packet according to the tenth information
  • the sending module is further configured to send the segmented data packet to the data unit.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Communication Control (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention concerne un procédé de communication, une unité distribuée (DU) et une unité de commande (CU). Selon le procédé : une DU reçoit un premier paquet de données en provenance d'une CU, un en-tête de paquet du premier paquet de données comprenant des premières informations d'indication d'invitation à émettre ; la DU envoie à un dispositif terminal un second paquet de données, un en-tête de paquet du second paquet de données comprenant les premières informations d'indication d'invitation à émettre ; la DU reçoit un premier rapport d'état de données en provenance du dispositif terminal ; et la DU envoie à la CU un second rapport d'état de données, le premier et le second rapport d'état de données servant tous deux à indiquer un paquet de données dans lequel une perte de paquet s'est produite. Sur la base d'un scénario de division CU-DU, l'invention pourvoit à un procédé de retransmission de données spécifique, et en particulier à un procédé d'acquisition d'un second rapport d'état de données.
PCT/CN2018/079731 2017-03-24 2018-03-21 Procédé de communication, unité distribuée et unité de commande WO2018171607A1 (fr)

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