WO2019137501A1 - Procédé et dispositif de communication - Google Patents

Procédé et dispositif de communication Download PDF

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Publication number
WO2019137501A1
WO2019137501A1 PCT/CN2019/071476 CN2019071476W WO2019137501A1 WO 2019137501 A1 WO2019137501 A1 WO 2019137501A1 CN 2019071476 W CN2019071476 W CN 2019071476W WO 2019137501 A1 WO2019137501 A1 WO 2019137501A1
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WIPO (PCT)
Prior art keywords
window
length
indication information
adjustment indication
data packet
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PCT/CN2019/071476
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English (en)
Chinese (zh)
Inventor
王刚
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华为技术有限公司
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Publication of WO2019137501A1 publication Critical patent/WO2019137501A1/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/20—Traffic policing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/27—Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/32—Flow control; Congestion control by discarding or delaying data units, e.g. packets or frames

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a communication method and apparatus.
  • Radio Link Control In the existing Long Term Evolution (LTE) system air interface transmission technology, there are two transmission modes in the Radio Link Control (RLC) layer, which are Acknowledged Mode (AM) and non-confirmation. Mode (Unacknowledged Mode, UM).
  • RLC Radio Link Control
  • AM Acknowledged Mode
  • UM Unacknowledged Mode
  • the transmitting end is only responsible for transmitting the data packet to the receiving end, and the receiving end does not need to further acknowledge the feedback to the transmitting end of the data packet receiving situation. That is to say, regardless of whether the receiving end successfully receives the data packet, the transmitting end does not resend the data packet.
  • the so-called in-order delivery means that the received data packet is delivered to the receiving layer in an increasing order according to the sequence number (SequenceNumber, SN) allocated by the RLC layer.
  • the RLC layer maintains a reordering window, which is responsible for retransmitting and filling the lost data packets, and delivering the received data packets to the upper layer in order.
  • the RLC layer When the RLC layer receives a retransmitted data packet, it may trigger a fast movement of the window, triggering a large number of data packets to be delivered to the Packet Data Convergence Protocol (PDCP) layer, and the converted data pulse rate may be very high. Therefore, the PDCP layer cannot process the instantaneous data pulse in time, resulting in insufficient memory or data accumulation and packet loss. At this time, because the window has been slid, the RLC layer will not retransmit, and the upper layer application needs to be retransmitted to complete the packet. The delay will be large, affecting the user experience, and the packet loss itself is a waste of air interface resources.
  • PDCP Packet Data Convergence Protocol
  • the RLC layer supports out-of-order delivery, the reordering window is maintained in the PDCP layer, and the complete RLC service data unit (SDU) received by the RLC layer Directly delivered to the PDCP layer.
  • SDU RLC service data unit
  • the RLC layer continuously submits data packets to the PDCP layer, it may have to drop the RLC layer to submit data packets because the PDCP layer has insufficient memory.
  • the RLC layer of these data packets is considered to have been received and will not be retransmitted.
  • the PDCP layer has been discarded, it will not actually be sent to the application layer. It needs to be retransmitted by the application layer to complete the delay. The delay will be large, which will affect the user experience.
  • the packet loss itself is a waste of air interface resources.
  • the PDCP layer may trigger the fast movement of the window, triggering a large number of data packets to be delivered to the upper layer, and the converted data pulse rate may be very high, thereby causing the upper layer to fail to process the instantaneous data pulse in time, resulting in memory. Insufficient or data accumulation and packet loss.
  • the processing capability and memory of the communication device are more and more difficult to cope with the impact of the pulse data.
  • the transmission packet is wasted when the received data packet is discarded. , affecting the user experience.
  • the embodiment of the present invention provides a communication method and device, which are used to solve the problem of how to reduce the probability of packet drop at the receiving end when the processing capability of the receiving end is insufficient.
  • An embodiment of the present application provides a communication method, where the method includes:
  • first window adjustment indication information is used to indicate The second device reduces the window length of the sending window; the window length of the sending window is proportional to the maximum number of data packets scheduled by the second device at one time;
  • the first device sends the first window adjustment indication information to the second device.
  • the first window adjustment indication information indicates that the second device reduces the window length of the sending window, thereby reducing the maximum scheduled data of the second device at one time. Packets, thereby reducing the number of received data packets, so that the data packets received by the first device can be processed in time, thereby reducing the probability of packet drop at the receiving end.
  • the determining that the data packet processing capability reaches the processing upper limit of the first device includes:
  • the first device determines that one or more of the following preset conditions are met, determining that the data packet processing capability reaches the processing upper limit of the first device:
  • the size of the idle buffer of the receiving buffer of the first device is less than a first threshold
  • the size of the occupied buffer of the receiving buffer of the first device is greater than a second threshold
  • the first device determines that there are no idle resources to process the received data packet.
  • the length of the window before the adjustment of the sending window is M, and M is greater than 0;
  • the length of the window after the adjustment of the sending window is a first length
  • the first length is ⁇ M, or the first length satisfies the following formula:
  • P is the first length
  • ⁇ is a number greater than 0 and less than 1
  • RX_Next_Highest is a value obtained by adding 1 to the SN of the currently received maximum sequence number SN
  • RX_Next is the reception of the first device.
  • the first SN in the window that does not receive the full data packet, LAST_UPLOAD is the number of data packets that the first device submits when it slides once on the receiving window, and min() is the minimum value operation.
  • the window length of the sending window is one of preset K lengths, and K is an integer greater than 0;
  • the first length is a length of the K lengths that is smaller than a length of the window before the transmission window is adjusted.
  • the buffer occupied by the logical channel or the data radio bearer corresponding to the first window adjustment indication information in the first device is greater than a third threshold; or the logical channel corresponding to the first window adjustment indication information or The data radio bearer occupies the largest cache in the first device.
  • the method before the first device generates the first window adjustment indication information, the method further includes:
  • the first device determines that the first timer has timed out
  • the first timer is started when the first device generates the window adjustment indication information, and the timing duration of the first timer is the first duration.
  • the method further includes:
  • the first device sends second window adjustment indication information to the second device
  • the second window adjustment indication information is used to indicate that the second device adjusts a window length of the sending window to a second length, the second length is greater than the first length, or the second length is smaller than Said first length.
  • the method further includes:
  • the first device determines that one or more of the following preset conditions are met:
  • the size of the idle buffer of the receiving buffer of the first device is greater than a fourth threshold
  • the size of the occupied buffer of the receiving buffer of the first device is less than a fifth threshold
  • the data rate received by the first device is less than a preset rate.
  • the first device when the first device sends the first window adjustment indication information, if it is determined that the reordering timer corresponding to the receiving window has been started, determining, by the first device, the value of the reordering timer state variable a sliding boundary of the receiving window; the sliding boundary is located within the receiving window, and a length between the sliding boundary and a starting boundary of the receiving window is a window length of the transmitting window.
  • the method further includes:
  • the first device determines a reordering timer state variable according to the following manner when the reordering timer corresponding to the receiving window is started, where the reordering timer state variable triggers a reordering timer corresponding to the receiving window to be started.
  • Packet SN Packet SN:
  • the value of the reordering timer state variable is determined as RX_Next_Highest, where RX_Next_Highest is the SN of the data packet of the currently received maximum sequence number SN plus one. a value; the sliding boundary is located in the receiving window, and a length between the sliding boundary and a starting boundary of the receiving window is a window length of the sending window;
  • the value of the reordering timer state variable is determined as the sliding boundary of the receiving window.
  • the sending, by the first device, the first window adjustment indication information to the second device includes:
  • the first device sends the first window adjustment indication information to the second device by using a radio link control RLC layer control message;
  • the first device sends the first window adjustment indication information to the second device by using a media intervention control MAC control element CE.
  • an embodiment of the present application provides a communication apparatus, where the communication apparatus can perform any one of the foregoing methods.
  • the above apparatus includes one or more processors and communication units.
  • the one or more processors are configured to support the apparatus to perform the respective functions of the first device of the above methods. For example, the first window adjustment indication information is generated.
  • the communication unit is configured to support the device to communicate with other devices to implement receiving and/or transmitting functions. For example, the first window adjustment indication information is sent.
  • the apparatus may further comprise one or more memories for coupling with the processor, which store program instructions and/or data necessary for the network device.
  • the one or more memories may be integrated with the processor or may be separate from the processor. This application is not limited.
  • the device may be a base station, a gNB or a TRP, etc.
  • the communication unit may be a transceiver, or a transceiver circuit.
  • the transceiver may also be an input/output circuit or an interface.
  • the device can also be a communication chip.
  • the communication unit may be an input/output circuit or interface of a communication chip.
  • the above apparatus includes a transceiver, a processor, and a memory.
  • the processor is for controlling a transceiver transceiver signal for storing a computer program for executing a computer program in a memory, such that the apparatus performs the first aspect or the first of any of the possible implementations of the first aspect The method by which the device is completed.
  • the above apparatus includes one or more processors and communication units.
  • the one or more processors are configured to support the apparatus to perform the respective functions of the first device of the above methods. For example, the first window adjustment indication information is generated.
  • the communication unit is configured to support the device to communicate with other devices to implement receiving and/or transmitting functions. For example, the first window adjustment indication information is sent to the second device.
  • the apparatus may further comprise one or more memories for coupling with the processor, which store program instructions and/or data necessary for the device.
  • the one or more memories may be integrated with the processor or may be separate from the processor. This application is not limited.
  • the device may be a smart terminal or a wearable device or the like, and the communication unit may be a transceiver or a transceiver circuit.
  • the transceiver may also be an input/output circuit or an interface.
  • the device can also be a communication chip.
  • the communication unit may be an input/output circuit or interface of a communication chip.
  • the above apparatus includes a transceiver, a processor, and a memory.
  • the processor is configured to control a transceiver transceiver signal for storing a computer program for executing a computer program in the memory, such that the device performs the terminal in any of the possible implementations of the second aspect or the second aspect The method of completion.
  • a system comprising the first device and the second device described above.
  • a fourth aspect a computer readable storage medium for storing a computer program, the computer program comprising instructions for performing the method of the first aspect or the possible implementation of any of the first aspects.
  • a fifth aspect a computer readable storage medium for storing a computer program, the computer program comprising instructions for performing the method of any of the possible implementations of the second aspect or the second aspect.
  • a computer program product comprising: computer program code, when the computer program code is run on a computer, causing the computer to perform any of the first aspect or the first aspect described above Possible methods in the implementation.
  • a computer program product comprising: computer program code, when the computer program code is run on a computer, causing the computer to perform any of the first aspect and the first aspect described above Possible methods in the implementation.
  • an embodiment of the present application provides a communication method, where the method includes:
  • the second device receives the first window adjustment indication information sent by the first device; the first window adjustment indication information is used to instruct the second device to reduce the window length of the sending window; the window length of the sending window is different from the first
  • the first device adjustment indication information is generated by the first device when determining that the data packet processing capability reaches the processing upper limit of the first device;
  • the second device adjusts a window length of the sending window according to the first window adjustment indication information.
  • the second device after receiving the first window adjustment indication information, the second device reduces the window length of the transmission window according to the first window adjustment indication information, thereby reducing the data packet sent to the second device at most once, thereby reducing the second device.
  • the number of received data packets so that the data packets received by the first device can be processed in time, thereby reducing the probability of packet loss at the receiving end.
  • the length of the window before the adjustment of the sending window is M, and M is greater than 0;
  • the length of the window after the adjustment of the sending window is a first length
  • the first length is ⁇ M, or the first length satisfies the following formula:
  • P is the first length
  • ⁇ is a number greater than 0 and less than 1
  • RX_Next_Highest is a value obtained by adding 1 to the SN of the currently received maximum sequence number SN
  • RX_Next is the reception of the first device.
  • the first SN in the window that does not receive the full data packet, LAST_UPLOAD is the number of data packets that the first device submits when it slides once on the receiving window, and min() is the minimum value operation.
  • the window length of the sending window is one of preset K lengths, and K is an integer greater than 0;
  • the first length is a maximum length of the K lengths that is smaller than a window length before the transmission window is adjusted.
  • the data signaling bearer of the logical channel corresponding to the sending window is greater than a third threshold in the cache occupied by the first device.
  • the method further includes:
  • the second device determines, according to the status report, that the data packet in the at least one data packet that is located in the sending window fails to be received, retransmitting the data packet that fails to be received;
  • the second device determines, according to the status report, that the data packet in the at least one data packet that is outside the sending window fails to be received, the data packet that fails to be received and located outside the sending window is marked, and When it is determined that the marked data packet is located in the sliding transmission window, the marked data packet is retransmitted.
  • the method further includes:
  • the second window adjustment indication information is used to indicate that the second device adjusts a window length of the sending window to a second length, the second length is greater than the first length, or the second length is smaller than Said first length;
  • the second device adjusts a window length of the sending window according to the second window adjustment indication information.
  • the embodiment of the present application provides a communication apparatus, where the communication apparatus can perform any one of the foregoing methods.
  • the above apparatus includes one or more processors and communication units.
  • the one or more processors are configured to support the apparatus to perform the corresponding functions of the access network device in the above method. For example, the first window adjustment indication information is generated.
  • the communication unit is configured to support the device to communicate with other devices to implement receiving and/or transmitting functions. For example, the first window adjustment indication information is sent.
  • the apparatus may further comprise one or more memories for coupling with the processor, which store program instructions and/or data necessary for accessing the network device.
  • the one or more memories may be integrated with the processor or may be separate from the processor. This application is not limited.
  • the device may be a base station, a gNB or a TRP, etc.
  • the communication unit may be a transceiver, or a transceiver circuit.
  • the transceiver may also be an input/output circuit or an interface.
  • the device can also be a communication chip.
  • the communication unit may be an input/output circuit or interface of a communication chip.
  • the above apparatus includes a transceiver, a processor, and a memory.
  • the processor is for controlling a transceiver transceiver signal for storing a computer program for executing a computer program in a memory, such that the apparatus performs the second aspect of any of the possible implementations of the eighth aspect or the eighth aspect The method by which the device is completed.
  • the above apparatus includes one or more processors and communication units.
  • the one or more processors are configured to support the apparatus to perform the corresponding functions of the second device in the above method. For example, the window length of the transmission window is adjusted according to the first window adjustment indication information.
  • the communication unit is configured to support the device to communicate with other devices to implement receiving and/or transmitting functions. For example, control information is transmitted through the resource.
  • the apparatus may further comprise one or more memories for coupling with the processor, which store program instructions and/or data necessary for the device.
  • the one or more memories may be integrated with the processor or may be separate from the processor. This application is not limited.
  • the device may be a smart terminal or a wearable device or the like, and the communication unit may be a transceiver or a transceiver circuit.
  • the transceiver may also be an input/output circuit or an interface.
  • the device can also be a communication chip.
  • the communication unit may be an input/output circuit or interface of a communication chip.
  • a tenth aspect a computer readable storage medium for storing a computer program, the computer program comprising instructions for performing the method of any of the eighth or eighth possible implementations.
  • a computer readable storage medium for storing a computer program, the computer program comprising instructions for performing the method of any of the eighth or eighth possible implementations.
  • a computer program product comprising: computer program code, when the computer program code is run on a computer, causing the computer to perform any of the above eighth aspect or eighth aspect A possible implementation.
  • FIG. 1 is a schematic diagram showing a communication system suitable for the communication method of the embodiment of the present application.
  • FIG. 2 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of a message according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a message according to an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a message according to an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a message according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a message according to an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a window according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 10 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 11 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 12 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of a terminal according to an embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of an access network device according to an embodiment of the present disclosure.
  • FIG. 15 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • NR new radio
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • LTE-A advanced long term evolution
  • UMTS universal mobile telecommunication system
  • eLTE evolved long term evolution
  • FIG. 1 shows a schematic diagram of a communication system suitable for the communication method of the embodiment of the present application.
  • the communication system 100 includes a network device 102 and a terminal device 106.
  • the network device 102 can be configured with multiple antennas, and the terminal device can also be configured with multiple antennas.
  • the communication system may also include a network device 104, which may also be configured with multiple antennas.
  • network device 102 or network device 104 may also include multiple components (eg, processors, modulators, multiplexers, demodulators or demultiplexers, etc.) associated with signal transmission and reception.
  • multiple components eg, processors, modulators, multiplexers, demodulators or demultiplexers, etc.
  • the terminal is a device having a wireless transceiver function or a chip that can be disposed on the device, and may also be referred to as a user equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, Mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device.
  • UE user equipment
  • the terminal in the embodiment of the present application may be a mobile phone, a tablet, a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, and an industrial Wireless terminal in industrial control, wireless terminal in self driving, wireless terminal in remote medical, wireless terminal in smart grid, transportation safety A wireless terminal in a wireless terminal, a wireless terminal in a smart city, a wireless terminal in a smart home, and the like.
  • the embodiment of the present application does not limit the application scenario.
  • the aforementioned terminal and a chip that can be disposed in the terminal are collectively referred to as a terminal.
  • the network device is a device with a wireless transceiver function or a chip that can be disposed on the device, and the device includes, but is not limited to, an evolved Node B (eNB), a radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (baseband unit, BBU), access point (AP), wireless relay node, wireless backhaul node, transmission point (transmission and reception point, TRP or transmission) in wireless fidelity (WIFI) system Point, TP), etc., may also be 5G, such as NR, gNB in the system, or transmission point (TRP or TP), one or a group of base stations (including multiple antenna panels) in the 5G system, Alternatively, it may be a network node constituting a gNB or a transmission point, such as a baseband unit (BBU), or a distributed unit (DU), or
  • the gNB may include a centralized unit (CU) and a DU.
  • the gNB may also include a radio unit (RU).
  • the CU implements some functions of the gNB, and the DU implements some functions of the gNB.
  • the CU implements radio resource control (RRC), the function of the packet data convergence protocol (PDCP) layer, and the DU implements the wireless chain.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • the DU implements the wireless chain.
  • the functions of the radio link control (RLC), the media access control (MAC), and the physical (PHY) layer Since the information of the RRC layer eventually becomes information of the PHY layer or is transformed by the information of the PHY layer, high-level signaling, such as RRC layer signaling or PHCP layer signaling, can also be used in this architecture.
  • the network device (including the network device) can be a CU node, or a DU node, or a device including a CU node and a DU node.
  • the CU may be divided into network devices in the access network RAN, and the CU may be divided into network devices in the core network CN, which is not limited herein.
  • the application will present various aspects, embodiments, or features in a system that can include multiple devices, components, modules, and the like. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules, etc. discussed in connection with the figures. In addition, a combination of these schemes can also be used.
  • the network architecture and the service scenario described in the embodiments of the present application are for the purpose of more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute a limitation of the technical solutions provided by the embodiments of the present application.
  • the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.
  • FIG. 2 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • the method includes:
  • Step 201 The first device receives the data packet sent by the second device, and generates a first window adjustment indication information when determining that the data packet processing capability reaches the processing upper limit of the first device, where the first window adjustment indication information is used. Instructing the second device to reduce a window length of the sending window; the window length of the sending window is proportional to the maximum number of data packets scheduled by the second device at one time.
  • the number of data packets sent by the second device to the first device is at least one.
  • Step 202 The first device sends the first window adjustment indication information to the second device.
  • Step 203 The second device receives the first window adjustment indication information sent by the first device, where the first window adjustment indication information is generated by the first device when determining that the data packet processing capability reaches the processing upper limit of the first device of.
  • Step 204 The second device adjusts a window length of the sending window according to the first window adjustment indication information.
  • the RLC entity of the second device may send a data packet to the first device in an acknowledgment mode, and the data packet in the embodiment of the present application may refer to an RLC PDU or the like.
  • the first device may be a terminal, or may be a communication device such as a network device; the second device may be a terminal or a communication device such as a network device, which is not limited in this embodiment of the present application.
  • the RLC entity at the receiving end maintains a receiving window
  • the RLC entity at the transmitting end maintains a sending window.
  • the receiving window and the sending window are similar to the functions and principles of the existing reordering window or reassembly window, and are used for retransmitting and filling the lost data packets, and delivering the received data packets to the upper layer in order.
  • the transmitting end arranges the data packets in the sending window in order, and when determining that the data packets in the sending window are sequentially sent to the receiving end, sliding the sending window, thereby ensuring that the data packet is in accordance with the data packet.
  • the sequence number is sent in ascending order.
  • the maximum number of packets sent by the sender at a time is the number of window lengths of the send window.
  • step 201 when the first device determines that one or more preset conditions are met, the first device determines that the data packet processing capability reaches the processing upper limit of the first device:
  • the size of the free buffer of the receiving buffer of the first device is less than a first threshold.
  • the receiving buffer may be a PDCP buffer, an RLC buffer, a buffer of the network card, a buffer of the application, etc.
  • the value of the first threshold may be determined according to actual conditions, for example, the first threshold may be the total amount of the receiving buffer. 20%, etc., will not be repeated here.
  • a data overflow occurs in the receive buffer of the first device.
  • the receiving buffer may be a PDCP buffer or the like.
  • the RLC entity of the first device delivers the data packet to the PDCP entity, it carries the RLC entity information, including the logical channel identifier and the like.
  • the first device determines that there are no idle resources to process the received data packet. Specifically, the network card in the first device or the Transmission Control Protocol/Internet Protocol (TCP/IP) stack or the application detects that packet loss occurs, or detects that the processor load of the first device is very If you are heavy, you can determine that there are no idle resources to process the received packets.
  • the idle resources may refer to storage resources, processor resources, and the like.
  • the size of the occupied buffer of the receiving buffer of the first device is greater than a second threshold.
  • the first device may first determine a data radio bearer (DRB) or a logical channel that is occupied by a cache greater than a third threshold, or determine a logical channel or DRB that occupies the largest cache, and then use the second device.
  • a transmission window corresponding to the logical channel or the data radio bearer is used as a transmission window to be adjusted, that is, the logical channel or the data radio bearer corresponding to the first window adjustment indication information is larger than the third cache occupied by the first device.
  • Threshold The value of the third threshold may be determined according to actual conditions, and details are not described herein again.
  • the first device before the first device generates the first window adjustment indication information, it is required to determine whether the first timer expires.
  • the first device determines that the first timer has timed out, generates the first window adjustment indication information, and does not generate the first window adjustment indication information.
  • the first timer is started when the first device generates the window adjustment indication information, and the timing of the first timer is the first duration.
  • the specific value of the first duration may be determined according to actual conditions. This is no longer an example.
  • the window adjustment indication information generated last time may be information used to adjust a transmission window of the second device.
  • the first window adjustment indication information may indicate that the window length of the sending window is a first length, and the first length is smaller than a window length before the sending window is adjusted. Specifically, before the first device generates the first window adjustment indication information, the first length may be determined to be smaller than the length of the window before the transmission window is adjusted. The first device can determine the first length in a variety of ways.
  • the first length determined by the first device satisfies the following formula:
  • P is the first length
  • ⁇ is a number greater than 0 and less than 1.
  • the value of ⁇ may be determined according to actual conditions, and is not illustrated one by one.
  • the first length determined by the first device satisfies the following formula:
  • RX_Next_Highest is a value obtained by adding 1 to the SN of the currently received maximum serial number (SN)
  • RX_Next is the The first SN of the receiving device of the first device that does not receive the full data packet
  • LAST_UPLOAD is the number of data packets submitted by the first device when the first window is slid on the receiving window
  • min() is the minimum value operation.
  • the window length of the sending window is one of preset K lengths, and K is an integer greater than 0.
  • the first length is a length of the K lengths that is smaller than a length of the window before the transmission window is adjusted.
  • the length of the window of the sending window is one of the preset five lengths, which are sequentially from small to large: L0, L3, L4, L5, L6, L7.
  • the preset K lengths may be located in the first window length set.
  • a window length may be selected from the first window length set as the window length after the transmission window is adjusted.
  • the first window length set includes K window lengths, and K is an integer greater than 0.
  • the length of the first window length set smaller than the window length before the transmission window adjustment may be used as the window length after the transmission window adjustment, that is, the first length.
  • the first window length set includes five window lengths, namely: 2 17 , 2 14 , 2 13 , 2 12 , 2 11 , 2 10 ; the corresponding index values are: 0, 3, 4, 5,6,7.
  • the window length before the transmission window adjustment is 2 14 .
  • the maximum window length of the first window length set is less than 2 14 , that is, 2 13 is the window length after the transmission window is adjusted, that is, the first One length.
  • the first window adjustment indication information may directly indicate the first length, or may indirectly indicate the first length.
  • the first window adjustment indication information directly indicates the first length, it may be a value of the first length.
  • the first device adjusts the window length of the sending window to a length of 2 16 , and the first window adjustment indication information is 2 16 .
  • the first window adjustment indication information indirectly indicates the first length, it may be an index value of the first length.
  • the first device adjusts the window length of the sending window to a length of 2 16 , and the index value corresponding to 2 16 is 5
  • the first window adjustment indication information is 5, of course, the preset relationship between the window length and the index value needs to be agreed in advance, and the specific agreement is not repeated here.
  • the first device sends the first window adjustment indication information to the second device, which may be implemented in multiple manners.
  • the first device passes the RRC.
  • the signaling sends the first window adjustment indication information to the second device.
  • the first device sends the first window adjustment indication information to the second device by using an RLC layer control message.
  • the specific format of the RLC layer control message may be referred to FIG.
  • the RLC layer control message includes a data/control (D/C) field, a control PDU type (CPT) field, a window size field, and a reserved (R) field.
  • the D/C field is used to indicate whether the message is a data message or a control message;
  • the CPT field is used to indicate the type of the message; and
  • the window length field carries the first window indication information.
  • the specific format of the RLC layer control message may be as shown in FIG. 4 when the first window adjustment indication information indicates the first length indirectly.
  • the RLC layer control message includes a D/C field, a CPT field, a window level field, and an R field.
  • the D/C field is used to indicate whether the message is a data message or a control message;
  • the CPT field is used to indicate the type of the message;
  • the window level field carries the first window indication information.
  • the index value of the first length indicated by the first window adjustment indication information is 5, and the corresponding length is 2 16 , and the first window indication information carried in the window level field is 5.
  • the RLC layer control message may further include a direction (DIR) field, which is used to indicate a window in an uplink direction or a window in a downlink direction.
  • DIR direction
  • the RLC layer control message may further include a direction (DIR) field, which is used to indicate a window in an uplink direction or a window in a downlink direction.
  • DIR direction
  • FIG. 3 to FIG. 5 are only examples, and the RLC layer control message may have other forms, and details are not described herein again.
  • the first device sends the first window adjustment indication information to the second device by using a MAC Control Element (CE).
  • CE MAC Control Element
  • the specific format of the MAC CE may be referred to FIG. 6.
  • the MAC CE includes an R field, a logical channel identify (LCID) field, an object logical channel identify (O_LCID) field, and a window length field.
  • the window length field carries the first window indication information; the O_LCID field is used to indicate the logical channel corresponding to the sending window, and the meanings of other fields may refer to the foregoing description, and details are not described herein again.
  • the specific format of the MAC CE may be referred to FIG. 7.
  • the MAC CE includes an R field, an LCID field, an O_LCID field, a window level field, and a DIR field.
  • the window level field carries the first window indication information.
  • the index value of the first length indicated by the first window adjustment indication information is 5, and the corresponding length is 2 16 , and the first window carried in the window level field.
  • the indication information is 5; the O_LCID field is used to indicate the logical channel corresponding to the sending window, and the meanings of other fields may refer to the foregoing description, and details are not described herein again.
  • FIG. 6 to FIG. 7 are only examples, and the MAC CE may have other forms, and details are not described herein again.
  • the first device sends the first window adjustment indication information to the second device, and may also start a second timer, where the second timer has a second duration and a second duration
  • the value can be determined according to the actual situation, and will not be described here.
  • the first device does not adjust the window length of the sending window before the second timer expires, thereby avoiding the occurrence of a signaling storm.
  • the first device may further select a window length of the sending window according to an actual situation. Make adjustments.
  • the first device may further send second window adjustment indication information to the second device, where the second window adjustment indication information is used to instruct the second device to adjust a window length of the sending window. Is a second length, the second length is greater than the first length, or the second length is less than the first length.
  • the second length is smaller than the first length; correspondingly, when the first device determines that the data packet processing capability does not reach the first device When the upper limit is processed, the second length is greater than the first length.
  • the first device when the first device determines that one or more preset conditions are met, it may be determined that the data packet processing capability does not reach the processing upper limit of the first device:
  • the size of the idle buffer of the receiving buffer of the first device is greater than a fourth threshold
  • the size of the occupied buffer of the receiving buffer of the first device is less than a fifth threshold
  • the data rate received by the first device is less than a preset rate.
  • the value of the fourth threshold, the fifth threshold, and the preset rate may be determined according to actual conditions, and details are not described herein again.
  • the second length when the second length is greater than the first length, the second length may satisfy the following formula:
  • T is the second length
  • P is the first length
  • ⁇ is a number greater than 1, and the value of ⁇ can be determined according to actual conditions, and will not be exemplified one by one.
  • a window length may be selected from the second window length set.
  • the second window length set includes Q window lengths, and Q is an integer greater than 0.
  • Q is an integer greater than 0.
  • the second window length set includes 8 window lengths, which are: 2 17 , 2 16 , 2 15 , 2 14 , 2 13 , 2 12 , 2 11 , 2 10 ; the corresponding index values are: 0,1,2,3,4,5,6,7.
  • the window length before the transmission window adjustment is 2 14 .
  • the minimum window length greater than 2 14 in the second window length set, that is, 2 15 is used as the window length after the transmission window adjustment, that is, the second length.
  • the first device when the first device starts the second timer, the first device sends the second window indication information to the second device after the second timer expires.
  • the receiving end of the data packet that is, the first device also maintains a receiving window
  • the receiving window specifies the number of data packets that the first device can receive without moving the receiving window forward. If the receive window moves forward, then any packet outside the receive window will slide out, regardless of its state, and will need to be reorganized.
  • the function and definition of the receiving window can be referred to the description of the prior art regarding reordering windows or reorganizing windows.
  • the receiving window corresponds to a reordering timer
  • the reordering timer corresponds to a reordering timer state variable
  • the reordering timer state variable is an SN that triggers a data packet initiated by the reordering timer corresponding to the receiving window.
  • the first device may determine a reordering timer state variable according to the following manner:
  • RX_Next_Highest is a value obtained by adding 1 to the SN of the data packet of the currently received maximum sequence number SN; the sliding boundary is located in the receiving window, and the sliding boundary is between the starting boundary of the receiving window and The length is the window length of the send window.
  • the starting boundary of the receiving window is the first SN of the first device that does not receive the full data packet in the receiving window of the first device.
  • RX_Next_Highest is located in the sliding boundary of the receiving window, which means that the value of RX_Next_Highest is greater than or equal to the starting boundary of the receiving window and less than or equal to the sliding boundary of the receiving window.
  • FIG. 8 a schematic diagram of a receiving window provided by an embodiment of the present application.
  • the window length of the sending window of the second device is M
  • the starting boundary of the receiving window of the first device is N+1
  • the sliding boundary of the receiving window of the first device is N+M.
  • the RX_Next_Highest is located in the sliding boundary of the receiving window, that is, when the RX_Next_Highest is greater than or equal to N+1 and less than or equal to N+M, the receiving device is located in the receiving window.
  • the value of the reordering timer state variable is RX_Next_Highest.
  • RX_Next_Highest is outside the sliding boundary of the receiving window, the value of the reordering timer state variable is determined as the sliding boundary of the receiving window.
  • RX_Next_Highest is located outside the sliding boundary of the receiving window, and may mean that RX_Next_Highest is larger than a sliding boundary of the receiving window.
  • the first device sends the first window adjustment indication information, if the reordering timer corresponding to the receiving window has been started, determining the value of the reordering timer state variable as the receiving window The sliding boundary.
  • the first device when the first device sends the first window adjustment indication information, it is determined that the reordering timer corresponding to the receiving window has been started, and the value of the reordering timer state variable is determined to be N+M.
  • step 204 after receiving the first window adjustment indication information, the second device reduces the window of the transmission window.
  • the transmission window specifies the number of data packets that the second device can transmit without moving the transmission window forward.
  • the second device may further receive a status report sent by the first device, where the status The report indicates whether each of the at least one data packet received by the first device from the second device is successfully received. It should be noted that the at least one data packet is sent by using a logical channel corresponding to the sending window.
  • the second device determines, according to the status report, that the data packet in the at least one data packet that is located in the sending window fails to be received, retransmitting the data packet that fails to be received.
  • the second device determines, according to the status report, that the data packets in the at least one data packet that are outside the sending window fail to be received, the data packets are not retransmitted temporarily, but the labeling fails to be received and is located. Transmitting the data packet outside the window, and retransmitting the marked data packet when it is determined that the marked data packet is located in the sliding transmission window.
  • the second device may further receive the second window adjustment indication information sent by the first device;
  • the adjustment indication information is used to instruct the second device to adjust a window length of the sending window to a second length, the second length is greater than the first length, or the second length is smaller than the first length.
  • the second device adjusts a window length of the sending window according to the second window adjustment indication information.
  • the window length of the receiving window of the first device is initialized to M, and the window length of the transmitting window of the second device is initialized to M.
  • M may be 2 17 .
  • the second device sends a data packet to the first device.
  • the RLC layer of the first device After receiving the data packet, the RLC layer of the first device carries information such as RLC entity information, logical channel identifier of the data packet, and the like when the RLC layer of the first device delivers the data packet to the PDCP layer of the first device.
  • Step 901 When the size of the idle buffer of the receiving buffer of the first device is less than the first threshold, the first device determines that the data packet processing capability reaches the processing upper limit of the first device.
  • Step 902 The PDCP layer of the first device indicates that the RLC layer of the first device reduces the window length of the sending window of the second device.
  • the first device may use a transmission window of the logical channel corresponding to the data radio bearer whose buffer is larger than the third threshold as a transmission window that needs to be adjusted.
  • the PDCP layer of the first device may indicate the RLC entity of the logical channel corresponding to the data radio bearer, and reduce the sending window of the logical channel corresponding to the data radio bearer.
  • Step 903 The first device determines first window adjustment indication information.
  • the RLC entity of the first device may first determine the window length of the adjusted transmission window of the second device, that is, the first length.
  • the first device may determine the first length according to formula (2); if not from the initial window of the transmission window, the first device may determine the first length according to formula (1).
  • the first device directly indicates the first length by using the first window adjustment indication information, and the first window adjustment indication information is a value of the first length.
  • Step 904 The first device sends the first window adjustment indication information to the second device, and starts a second timer.
  • the first device may generate an RLC layer control message by using an RLC entity of the first device, and send the first window adjustment indication information by using an RLC layer control message.
  • RLC layer control message For the structure of the RLC layer control message, reference may be made to FIG. 3 to FIG. 5, and details are not described herein again.
  • Step 905 The second device adjusts the window length of the sending window according to the first window adjustment indication information.
  • the data packet sent by the second device and the retransmitted data packet do not exceed the range of the window length of the adjusted transmission window.
  • Step 906 The first device sends a status report to the second device.
  • Step 907 The second device performs data packet retransmission according to the status report.
  • the second device determines, according to the status report, that the data packet in the at least one data packet that is located in the sending window fails to be received, retransmitting the data packet that fails to be received.
  • the second device determines, according to the status report, that the data packets in the at least one data packet that are outside the sending window fail to be received, the data packets are not retransmitted temporarily, but the labeling fails to be received and is located. Transmitting the data packet outside the window, and retransmitting the marked data packet when it is determined that the marked data packet is located in the sliding transmission window.
  • the first device reduces the second device again based on the window length of the last reduced transmission window. The length of the window in the send window.
  • step 908 the first device sends the second window adjustment indication information to the second device, and starts the second timer.
  • the second window adjustment indication information is used to instruct the second device to adjust a window length of the sending window to a second length, where the second length is smaller than the first length.
  • the second length can be determined by equation (1).
  • Step 909 The second device adjusts the window length of the sending window according to the second window adjustment indication information.
  • the first device determines that the sending window of the second device needs to be added, so that the window of the last reduced sending window may be On the basis of the length, the window length of the sending window of the second device is increased.
  • the receiving buffer of the first device may refer to the RLC layer receiving buffer, and may also refer to the PDCP layer receiving buffer.
  • the first device sends the third window adjustment indication information to the second device, where the second window adjustment indication information is used to instruct the second device to adjust the window length of the sending window to a third length.
  • the third length is greater than the second length.
  • the third length can be determined by equation (3).
  • the second timer may also be started again.
  • Step 911 The second device adjusts the window length of the sending window according to the third window adjustment indication information.
  • the data packet sent by the second device and the retransmitted data packet do not exceed the range of the window length of the adjusted transmission window.
  • the window length of the receiving window of the first device is initialized to M, and the window length of the transmitting window of the second device is initialized to M.
  • M may be 2 17 .
  • the second device sends a data packet to the first device.
  • the RLC layer of the first device After receiving the data packet, the RLC layer of the first device carries information such as RLC entity information, logical channel identifier of the data packet, and the like when the RLC layer of the first device delivers the data packet to the PDCP layer of the second device.
  • Step 1001 When data overflow occurs in the receive buffer of the first device, packet loss occurs. At this time, the first device determines that the data packet processing capability reaches the processing upper limit of the first device.
  • the RLC entity of the first device delivers the data packet to the PDCP entity, it carries the RLC entity information, including the logical channel identifier and the like.
  • the PDCP entity of the first device notifies the RLC entity of the first device of packet loss related information, if the RLC entity of the first device has not confirmed to the second device that the corresponding data packet has been received. To, you can continue to wait for the second device to retransmit the above packet loss.
  • Step 1002 The PDCP layer of the first device indicates that the RLC layer of the first device reduces the window length of the sending window of the second device.
  • the first device may use a transmission window of the logical channel corresponding to the data radio bearer whose buffer is larger than the third threshold as a transmission window that needs to be adjusted.
  • the PDCP layer of the first device may indicate the RLC entity of the logical channel corresponding to the data radio bearer, and reduce the sending window of the logical channel corresponding to the data radio bearer.
  • Step 1003 The first device determines first window adjustment indication information.
  • the RLC entity of the first device may first determine the window length of the adjusted transmission window of the second device, that is, the first length.
  • the first device may determine the first length according to formula (2); if not from the initial window of the transmission window, the first device may determine the first length according to formula (1).
  • the first device directly indicates the first length by using the first window adjustment indication information, and the first window adjustment indication information is a value of the first length.
  • Step 1004 The first device sends the first window adjustment indication information to the second device, and starts a second timer.
  • the RLC entity of the first device sends the first window adjustment indication information to the MAC entity of the first device
  • the MAC entity of the first device constructs the MAC CE
  • sends the first window adjustment indication information by using the MAC CE For the structure of the MAC CE, reference may be made to FIG. 6 to FIG. 7 , and details are not described herein again.
  • Step 1005 The second device adjusts the window length of the sending window according to the first window adjustment indication information.
  • the data packet sent by the second device and the retransmitted data packet do not exceed the range of the window length of the adjusted transmission window.
  • Step 1006 The first device sends a status report to the second device.
  • Step 1007 The second device performs data packet retransmission according to the status report.
  • the second device determines, according to the status report, that the data packet in the at least one data packet that is located in the sending window fails to be received, retransmitting the data packet that fails to be received.
  • the second device determines, according to the status report, that the data packets in the at least one data packet that are outside the sending window fail to be received, the data packets are not retransmitted temporarily, but the labeling fails to be received and is located. Transmitting the data packet outside the window, and retransmitting the marked data packet when it is determined that the marked data packet is located in the sliding transmission window.
  • the first device reduces the second device again based on the window length of the last reduced transmission window. The length of the window in the send window.
  • step 1008 the first device sends the second window adjustment indication information to the second device, and starts the second timer.
  • the second window adjustment indication information is used to instruct the second device to adjust a window length of the sending window to a second length, where the second length is smaller than the first length.
  • the second length can be determined by equation (1).
  • Step 1009 The second device adjusts the window length of the sending window according to the second window adjustment indication information.
  • the first device determines It is necessary to increase the transmission window of the second device, so that the window length of the transmission window of the second device can be increased on the basis of the window length of the transmission window that was last reduced.
  • the receiving buffer of the first device may refer to the RLC layer receiving buffer, and may also refer to the PDCP layer receiving buffer.
  • the first device sends a third window adjustment indication information to the second device, where the second window adjustment indication information is used to instruct the second device to adjust the window length of the sending window to a third length.
  • the third length is greater than the second length.
  • the third length can be determined by equation (3).
  • the second timer may also be started again.
  • Step 1011 The second device adjusts the window length of the sending window according to the third window adjustment indication information.
  • the data packet sent by the second device and the retransmitted data packet do not exceed the range of the window length of the adjusted transmission window.
  • the window length of the receiving window of the first device is initialized to M
  • the window length of the transmitting window of the second device is initialized to M2.
  • M is the preset value.
  • M can be 2 17 .
  • the second device may determine the window length of the sending window at the time of initialization according to the actual situation, and details are not described herein again.
  • M2 can be 2 12 .
  • a window length when the length of the sending window is reduced, a window length may be selected from the first window length set as the window length after the sending window is adjusted.
  • the first window length set includes K window lengths, and K is an integer greater than 0.
  • K is an integer greater than 0.
  • the first window length set includes five window lengths, namely: 2 17 , 2 14 , 2 13 , 2 12 , 2 11 , 2 10 ; the corresponding index values are: 0, 3, 4, 5,6,7.
  • the window length before the transmission window adjustment is 2 14 .
  • the maximum window length of less than 2 14 in the first window length set, that is, 2 13 is used as the window length after the transmission window is adjusted.
  • a window length can be selected from the second window length set.
  • the second window length set includes Q window lengths, and Q is an integer greater than 0.
  • Q is an integer greater than 0.
  • the second window length set includes 8 window lengths, which are: 2 17 , 2 16 , 2 15 , 2 14 , 2 13 , 2 12 , 2 11 , 2 10 ; the corresponding index values are: 0,1,2,3,4,5,6,7.
  • the window length before the transmission window adjustment is 2 14 .
  • the minimum window length greater than 2 14 in the second window length set, that is, 2 15 is used as the window length after the transmission window is adjusted.
  • FIG. 11 a schematic flowchart of a communication method provided by an embodiment of the present application is provided.
  • the second device and the network side activate the PDU session.
  • the first window length set and the second window length set are respectively selected.
  • the first window length set includes five window lengths, namely: 2 17 , 2 14 , 2 13 , 2 12 , 2 11 , 2 10 ; the corresponding index values are: 0, 3, 4, 5, 6, 7.
  • the second window length set includes 8 window lengths, respectively: 2 17 , 2 16 , 2 15 , 2 14 , 2 13 , 2 12 , 2 11 , 2 10 ; the corresponding index values are: 0, 1, 2,3,4,5,6,7.
  • Step 1101 When the size of the idle buffer of the receiving buffer of the first device is less than the first threshold, the first device determines that the data packet processing capability reaches the processing upper limit of the first device.
  • the receive buffer may refer to an RLC layer receive buffer.
  • the first device may use a transmission window of the logical channel corresponding to the data radio bearer whose buffer is larger than the third threshold as a transmission window that needs to be adjusted.
  • Step 1102 The first device determines first window adjustment indication information.
  • the RLC entity of the first device may use the maximum length of the first window length set that is smaller than the window length before the transmission window is adjusted as the window length after the transmission window is adjusted.
  • the first length determined by the RLC entity of the first device from the first set of window lengths is 2 11 .
  • the first window adjustment indication information determined by the first device may be a value of the first length, or may be an index value of the first length.
  • Step 1103 The first device sends the first window adjustment indication information to the second device, and starts the second timer.
  • the first device may generate an RLC layer control message by using an RLC entity of the first device, and send the first window adjustment indication information by using an RLC layer control message.
  • RLC layer control message For the structure of the RLC layer control message, reference may be made to FIG. 3 to FIG. 5, and details are not described herein again.
  • Step 1104 The second device adjusts the window length of the sending window according to the first window adjustment indication information.
  • the data packet sent by the second device and the retransmitted data packet do not exceed the range of the window length of the adjusted transmission window.
  • Step 1105 The first device sends a status report to the second device.
  • Step 1106 The second device performs data packet retransmission according to the status report.
  • the second device determines, according to the status report, that the data packet in the at least one data packet that is located in the sending window fails to be received, retransmitting the data packet that fails to be received.
  • the second device determines, according to the status report, that the data packets in the at least one data packet that are outside the sending window fail to be received, the data packets are not retransmitted temporarily, but the labeling fails to be received and is located. Transmitting the data packet outside the window, and retransmitting the marked data packet when it is determined that the marked data packet is located in the sliding transmission window.
  • the first device reduces the second device again based on the window length of the last reduced transmission window. The length of the window in the send window.
  • the first device sends the second window adjustment indication information to the second device, and starts the second timer.
  • the second window adjustment indication information is used to instruct the second device to adjust a window length of the sending window to a second length, where the second length is smaller than the first length.
  • the second length determined by the RLC entity of the first device from the first set of window lengths is 2 10 .
  • Step 1108 The second device adjusts the window length of the sending window according to the second window adjustment indication information.
  • the first device determines that the sending window of the second device needs to be added, so that the window of the last reduced sending window may be On the basis of the length, the window length of the sending window of the second device is increased.
  • the receiving buffer of the first device may refer to the RLC layer receiving buffer, and may also refer to the PDCP layer receiving buffer.
  • the first device sends a third window adjustment indication information to the second device, where the second window adjustment indication information is used to instruct the second device to adjust the window length of the sending window to a third length.
  • the third length is greater than the second length.
  • the third length determined by the RLC entity of the first device from the second set of window lengths is 2 11 .
  • Step 1110 The second device adjusts the window length of the sending window according to the third window adjustment indication information.
  • the data packet sent by the second device and the retransmitted data packet do not exceed the range of the window length of the adjusted transmission window.
  • FIG. 12 is a schematic flowchart diagram of a communication method according to an embodiment of the present application.
  • the second device and the network side activate the PDU session.
  • the first window length set and the second window length set are respectively selected.
  • the first window length set includes five window lengths, namely: 2 17 , 2 14 , 2 13 , 2 12 , 2 11 , 2 10 ; the corresponding index values are: 0, 3, 4, 5, 6, 7.
  • the second window length set includes 8 window lengths, respectively: 2 17 , 2 16 , 2 15 , 2 14 , 2 13 , 2 12 , 2 11 , 2 10 ; the corresponding index values are: 0, 1, 2,3,4,5,6,7.
  • Step 1201 When the size of the idle buffer of the receiving buffer of the first device is less than the first threshold, the first device determines that the data packet processing capability reaches the processing upper limit of the first device.
  • the receive buffer may refer to an RLC layer receive buffer.
  • the first device may use a transmission window of the logical channel corresponding to the data radio bearer whose buffer is larger than the third threshold as a transmission window that needs to be adjusted.
  • Step 1202 The first device determines first window adjustment indication information.
  • the first length determined by the RLC entity of the first device from the first set of window lengths is 2 11 .
  • the first window adjustment indication information determined by the first device may be a value of the first length, or may be an index value of the first length.
  • Step 1203 The first device sends the first window adjustment indication information to the second device, and starts the second timer.
  • the RLC entity of the first device sends the first window adjustment indication information to the MAC entity of the first device
  • the MAC entity of the first device constructs the MAC CE
  • sends the first window adjustment indication information by using the MAC CE For the structure of the MAC CE, reference may be made to FIG. 6 to FIG. 7 , and details are not described herein again.
  • Step 1204 The second device adjusts the window length of the sending window according to the first window adjustment indication information.
  • the second device determines, as the transmission window that needs to be adjusted, the transmission window corresponding to the logical channel indicated by the target logical channel field in the MAC CE.
  • the data packet sent by the second device and the retransmitted data packet do not exceed the range of the window length of the adjusted transmission window.
  • Step 1205 The first device sends a status report to the second device.
  • Step 1206 The second device performs data packet retransmission according to the status report.
  • the second device determines, according to the status report, that the data packet in the at least one data packet that is located in the sending window fails to be received, retransmitting the data packet that fails to be received.
  • the second device determines, according to the status report, that the data packets in the at least one data packet that are outside the sending window fail to be received, the data packets are not retransmitted temporarily, but the labeling fails to be received and is located. Transmitting the data packet outside the window, and retransmitting the marked data packet when it is determined that the marked data packet is located in the sliding transmission window.
  • the first device reduces the second device again based on the window length of the last reduced transmission window. The length of the window in the send window.
  • the first device sends the second window adjustment indication information to the second device, and starts the second timer.
  • the second window adjustment indication information is used to instruct the second device to adjust a window length of the sending window to a second length, where the second length is smaller than the first length.
  • the second length determined by the RLC entity of the first device from the first set of window lengths is 2 10 .
  • Step 1208 The second device adjusts the window length of the sending window according to the third window adjustment indication information.
  • the first device determines that the sending window of the second device needs to be added, so that the window of the last reduced sending window may be On the basis of the length, the window length of the sending window of the second device is increased.
  • the receiving buffer of the first device may refer to the RLC layer receiving buffer, and may also refer to the PDCP layer receiving buffer.
  • the first device sends a third window adjustment indication information to the second device, where the second window adjustment indication information is used to instruct the second device to adjust the window length of the sending window to a third length.
  • the third length is greater than the second length.
  • the third length determined by the RLC entity of the first device from the second set of window lengths is 2 11 .
  • Step 1210 The second device adjusts the window length of the sending window according to the third window adjustment indication information.
  • the data packet sent by the second device and the retransmitted data packet do not exceed the range of the window length of the adjusted transmission window.
  • FIG. 13 is a schematic structural diagram of a terminal according to an embodiment of the present application.
  • the terminal can be applied to the flowchart shown in FIG. 2 to perform the functions of the first device or the second device in the foregoing method embodiment.
  • FIG. 13 shows only the main components of the terminal.
  • the terminal 130 includes a processor, a memory, a control circuit, an antenna, and an input and output device.
  • the processor is mainly used for processing the communication protocol and the communication data, and controlling the entire terminal, executing the software program, and processing the data of the software program, for example, for supporting the terminal to perform the actions described in the foregoing method embodiment, for example, generating
  • the first window adjusts the indication information, and sends the first window adjustment indication information and the like to the second device.
  • the memory is mainly used to store software programs and data, such as storing the first window adjustment indication information and the like described in the above embodiments.
  • the control circuit is mainly used for converting baseband signals and radio frequency signals and processing radio frequency signals.
  • the control circuit together with the antenna can also be called a transceiver, and is mainly used for transmitting and receiving RF signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, keyboards, etc., are primarily used to receive user input data and output data to the user.
  • the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program.
  • the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit performs radio frequency processing on the baseband signal, and then sends the radio frequency signal to the outside through the antenna in the form of electromagnetic waves.
  • the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor, which converts the baseband signal into data and processes the data.
  • FIG. 13 shows only one memory and one processor for ease of illustration. In an actual terminal, there may be multiple processors and multiple memories.
  • the memory may also be referred to as a storage medium or a storage device, and the like.
  • the processor may include a baseband processor and a central processing unit, and the baseband processor is mainly used to process communication protocols and communication data, and the central processing unit is mainly used to control the entire terminal and execute the software.
  • the processor in FIG. 13 may include the functions of a baseband processor and/or a central processing unit. It will be understood by those skilled in the art that the baseband processor and the central processing unit may also be separate processors, interconnected by a bus or the like.
  • the terminal may include one or more baseband processors to accommodate different network standards.
  • the terminal may include multiple central processors to enhance its processing capabilities, and various components of the terminal may be connected through various buses.
  • the baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip.
  • the central processing unit can also be expressed as a central processing circuit or a central processing chip.
  • the functions of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, and the processor executes the software program to implement the baseband processing function.
  • the antenna and the control circuit having the transceiving function can be regarded as the transceiving unit 1301 of the terminal 130, for example, for supporting the terminal to perform the receiving function and the transmitting function as described in part in FIG.
  • the processor having the processing function is treated as the processing unit 1302 of the terminal 130.
  • the terminal 130 includes a transceiver unit 1301 and a processing unit 1302.
  • the transceiver unit can also be referred to as a transceiver, a transceiver, a transceiver, and the like.
  • the device for implementing the receiving function in the transceiver unit 1301 can be regarded as a receiving unit, and the device for implementing the sending function in the transceiver unit 1301 is regarded as a sending unit, that is, the transceiver unit 1301 includes a receiving unit and a sending unit.
  • the receiving unit may also be referred to as a receiver, an input port, a receiving circuit, etc.
  • the transmitting unit may be referred to as a transmitter, a transmitter, or a transmitting circuit or the like.
  • the processing unit 1302 is configured to execute the instructions stored in the memory to control the transceiver unit 1301 to receive signals and/or transmit signals to complete the functions of the terminal in the foregoing method embodiment.
  • the function of the transceiver unit 1301 can be implemented by a dedicated chip through a transceiver circuit or a transceiver.
  • FIG. 14 is a schematic structural diagram of a network device according to an embodiment of the present application, which may be a schematic structural diagram of a base station.
  • the base station 140 can include one or more radio frequency units, such as a remote radio unit (RRU) 1401 and one or more baseband units (BBUs) (also referred to as digital units, DUs).
  • RRU remote radio unit
  • BBUs baseband units
  • the RRU 1401 may be referred to as a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 14011 and a radio frequency unit 14012.
  • the RRU 1401 part is mainly used for transmitting and receiving radio frequency signals and converting radio frequency signals and baseband signals, for example, for transmitting the signaling messages described in the foregoing embodiments to the terminal.
  • the BBU 1402 portion is mainly used for performing baseband processing, controlling a base station, and the like.
  • the RRU 1401 and the BBU 1402 may be physically disposed together or physically separated, that is, distributed base stations.
  • the BBU 1402 is a control center of a base station, and may also be referred to as a processing unit, and is mainly used to perform baseband processing functions such as channel coding, multiplexing, modulation, spreading, and the like.
  • the BBU (processing unit) 1402 can be used to control the base station to perform an operation procedure of the access network device in the foregoing method embodiment.
  • the BBU 1402 may be composed of one or more boards, and multiple boards may jointly support a single access indication radio access network (such as an LTE network), or may support different access systems respectively. Radio access network (such as LTE network, 5G network or other network).
  • the BBU 1402 also includes a memory 14021 and a processor 14022 for storing the necessary instructions and data.
  • the memory 14021 stores the correspondence relationship between the codebook index and the precoding matrix in the above embodiment.
  • the processor 14022 is configured to control the base station to perform necessary actions, for example, to control the base station to perform an operation procedure of the access network device in the foregoing method embodiment.
  • the memory 14021 and the processor 14022 can serve one or more boards. That is, the memory and processor can be individually set on each board. It is also possible that multiple boards share the same memory and processor. In addition, the necessary circuits can be set on each board.
  • FIG. 15 shows a schematic structural diagram of a communication device 1500.
  • the device 1500 can be used to implement the method described in the foregoing method embodiments, and can be referred to the description in the foregoing method embodiments.
  • the communication device 1500 can be a chip, an access network device (such as a base station), a terminal or other access network device, and the like.
  • the communication device 1500 includes one or more processors 1501.
  • the processor 1501 may be a general purpose processor and/or a dedicated processor or the like.
  • it can be a baseband processor, or a central processing unit.
  • the baseband processor can be used to process communication protocols and communication data
  • the central processor can be used to control communication devices (eg, base stations, terminals, or chips, etc.), execute software programs, and process data of the software programs.
  • the communication device may include a transceiver unit for implementing input (reception) and output (transmission) of signals.
  • the communication device can be a chip, and the transceiver unit can be an input and/or output circuit of the chip, or a communication interface.
  • the chip can be used for a terminal or base station or other access network device.
  • the communication device may be a terminal or a base station or other access network device
  • the transceiver unit may be a transceiver, a radio frequency chip, or the like.
  • the communication device 1500 includes one or more of the processors 1501, and the one or more processors 1501 can implement a method of accessing a network device or terminal in the embodiment shown in FIG. 2.
  • the communication device 1500 includes means for generating first window adjustment indication information, and means for transmitting first window adjustment indication information.
  • the function of generating the first window adjustment indication information and the means of transmitting the first window adjustment indication information may be implemented by one or more processors.
  • the first window adjustment indication information may be generated by one or more processors, and the first window adjustment indication information may be sent through a transceiver, an input/output circuit, or an interface of a chip.
  • the first window adjustment indication information refer to the related description in the foregoing method embodiment.
  • the communication device 1500 includes means for receiving first window adjustment indication information, and means for determining resources indicated by the first window adjustment indication information.
  • first window adjustment indication information For the first window adjustment indication information and how to determine the resource indicated by the first window adjustment indication information, refer to the related description in the foregoing method embodiment.
  • the first window adjustment indication information may be received, for example, by a transceiver, or an input/output circuit, or an interface of the chip, and the resource indicated by the first window adjustment indication information is determined by one or more processors.
  • the processor 1501 can implement other functions in addition to the method of the embodiment shown in FIG. 2.
  • the processor 1501 may also include an instruction 1503 that may be executed on the processor such that the communication device 1500 performs the method described in the above method embodiments.
  • the communication device 1500 can also include circuitry that can implement the functionality of the access network device or terminal in the foregoing method embodiments.
  • the communication device 1500 can include one or more memories 1502 having instructions 1504 stored thereon that can be executed on the processor such that the communication device 1500 executes The method described in the above method embodiments.
  • data may also be stored in the memory.
  • Instructions and/or data can also be stored in the optional processor.
  • the one or more memories 1502 may store the correspondences described in the above embodiments, or related parameters or tables or the like involved in the above embodiments.
  • the processor and the memory may be provided separately or integrated.
  • the communication device 1500 may further include a transceiver unit 1505 and an antenna 1506.
  • the processor 1501 may be referred to as a processing unit that controls a communication device (terminal or base station).
  • the transceiver unit 1505 may be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., for implementing a transceiving function of the communication device through the antenna 1506.
  • the application also provides a communication system comprising one or more of the aforementioned first devices, and one or more second devices.
  • the embodiment of the present application further provides a computer readable medium having stored thereon a computer program, which is implemented by a computer to implement the method described in any one of the foregoing method embodiments.
  • the embodiment of the present application further provides a computer program product, which is implemented by a computer to implement the method described in any of the foregoing method embodiments.
  • processors in the embodiment of the present application may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSPs), and dedicated integration.
  • DSPs digital signal processors
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read only memory (ROMM), an erasable programmable read only memory (erasable PROM, EPROM), or an electrical Erase programmable EPROM (EEPROM) or flash memory.
  • the volatile memory can be a random access memory (RAM) that acts as an external cache.
  • RAM random access memory
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • synchronous dynamic randomness synchronous dynamic randomness.
  • Synchronous DRAM SDRAM
  • DDR SDRAM double data rate synchronous DRAM
  • ESDRAM enhanced synchronous dynamic random access memory
  • SLDRAM synchronous connection dynamic random access memory Take memory
  • DR RAM direct memory bus random access memory
  • the above embodiments may be implemented in whole or in part by software, hardware (such as circuitry), firmware, or any other combination.
  • the above-described embodiments may be implemented in whole or in part in the form of a computer program product.
  • the computer program product comprises one or more computer instructions or computer programs.
  • the processes or functions described in accordance with embodiments of the present application are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that contains one or more sets of available media.
  • the usable medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium.
  • the semiconductor medium can be a solid state hard drive.
  • the size of the sequence numbers of the foregoing processes does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and should not be applied to the embodiment of the present application.
  • the implementation process constitutes any limitation.

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

Abstract

L'invention concerne un procédé et un dispositif de communication, le procédé comprenant les étapes suivantes : un premier dispositif reçoit un paquet de données transmis par un second dispositif et génère des premières informations d'indication d'ajustement de fenêtre lorsqu'il est déterminé qu'une capacité de traitement de paquets de données atteint une limite supérieure de traitement du premier dispositif, les premières informations d'indication d'ajustement de fenêtre étant utilisées pour indiquer au second dispositif de réduire la longueur de fenêtre d'une fenêtre de transmission, et la longueur de fenêtre de la fenêtre de transmission étant proportionnelle au nombre maximal de paquets de données programmés par le second dispositif à un moment ; et le premier dispositif transmet les premières informations d'indication d'ajustement de fenêtre au second dispositif.
PCT/CN2019/071476 2018-01-12 2019-01-11 Procédé et dispositif de communication WO2019137501A1 (fr)

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