WO2019137501A1 - 一种通信方法及装置 - Google Patents

一种通信方法及装置 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)
French (fr)
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/zh

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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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Abstract

一种通信方法及装置，其中方法包括：第一设备接收第二设备发送的数据包，并在确定数据包处理能力达到所述第一设备的处理上限时，生成第一窗口调整指示信息；所述第一窗口调整指示信息用于指示所述第二设备减少发送窗口的窗口长度；所述发送窗口的窗口长度与所述第二设备一次最多调度的数据包的数量成正比；所述第一设备向所述第二设备发送所述第一窗口调整指示信息。

Description

一种通信方法及装置
本申请要求在2018年01月12日提交国家专利局、申请号为201810032226.8、发明名称为“一种通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种通信方法及装置。
背景技术
现有的长期演进(Long Term Evolution,LTE)***空口传输技术中，在无线链路控制(Radio Link Control,RLC)层有两种传输模式，分别是确认模式(Acknowledged Mode，AM)和非确认模式(Unacknowledged Mode,UM)。对于RLC UM传输模式来说，发送端只负责将数据包发送给接收端即可，不需要接收端进一步对数据包接收情况向发送端进行确认反馈。也就是说，不论接收端是否成功接收到数据包，发送端都不再重新发送数据包。
对于RLC AM传输模式的接收端来说，需要保证数据包按序递交给接收层。所谓按序递交是指按照RLC层分配的包序号(SequenceNumber，SN)递增的顺序将接收到的数据包递交给接收层。在LTE***中，RLC层维护重排序窗口，负责重传和补齐空口丢失的数据包，并按序向上层递交收到的数据包。当RLC层收到一个重传的数据包时，有可能触发窗口的快速移动，触发大量的数据包递交到分组数据汇聚协议(Packet Data Convergence Protocol,PDCP)层，折算的数据脉冲速率可能非常高，从而导致PDCP层不能及时处理瞬时的数据脉冲，导致内存不足或者数据堆积并丢包，这时的丢包因为窗口已经滑动，RLC层不会再重传，需要上层应用重传才能补齐，时延会比较大，影响用户体验，同时丢包本身是对空口资源的一种浪费。
相应的，未来的新空口(new radio，NR)***中，RLC层支持乱序递交，重排序窗口放在PDCP层维护，RLC层收到的完整RLC业务数据单元(service data unit，SDU)会直接递交给PDCP层，当RLC层不断向PDCP层递交数据包时，可能因为PDCP层内存不足导致不得不丢弃RLC层递交数据包，这些数据包RLC层认为已经收到，不会进行重传，但因为PDCP层已经丢弃，不会实际上送到应用层，需要应用层重传才能补齐，时延会比较大，影响用户体验，同时丢包本身是对空口资源的一种浪费。当PDCP层收到窗口下界的数据包时，可能触发窗口的快速移动，触发大量的数据包递交到上层，折算的数据脉冲速率可能非常高，从而导致上层不能及时处理瞬时的数据脉冲，导致内存不足或者数据堆积并丢包。
综上，现有技术中，通信设备的处理能力和内存越来越难以应对脉冲数据的冲击，当通信设备接收到的数据包来不及处理，导致将接收到的数据包丢弃时，浪费了传输资源，影响了用户体验。
发明内容
本申请实施例提供一种通信方法及装置，用以解决在接收端处理能力不足时，如何降低接收端数据包丢弃的概率。
本申请实施例提供一种通信方法，该方法包括：
第一设备接收第二设备发送的数据包，并在确定数据包处理能力达到所述第一设备的处理上限时，生成第一窗口调整指示信息；所述第一窗口调整指示信息用于指示所述第二设备减少发送窗口的窗口长度；所述发送窗口的窗口长度与所述第二设备一次最多调度的数据包的数量成正比；
所述第一设备向所述第二设备发送所述第一窗口调整指示信息。
根据上述方法，第一设备在确定处理能力达到所述第一设备的处理上限时，通过第一窗口调整指示信息指示第二设备减少发送窗口的窗口长度，从而减少第二设备一次最多调度的数据包，从而减少接收到的数据包的数量，从而使得第一设备接收到的数据包能够及时得到处理，从而降低接收端数据包丢弃的概率。
可选的，所述确定数据包处理能力达到所述第一设备的处理上限，包括：
所述第一设备确定满足以下一项或多项预设条件时，确定数据包处理能力达到所述第一设备的处理上限：
所述第一设备的接收缓冲区的空闲缓存的大小小于第一阈值；
所述第一设备的接收缓冲区的占用缓存的大小大于第二阈值；
所述第一设备的接收缓冲区发生数据溢出；
所述第一设备确定没有空闲的资源处理接收到的数据包。
可选的，所述发送窗口调整前的窗口长度为M，M大于0；
所述发送窗口调整后的窗口长度为第一长度；
所述第一长度为α×M，或者，所述第一长度满足以下公式：
P＝α×min((RX_Next_Highest-RX_Next+LAST_UPLOAD)，M)
其中，P为所述第一长度，α为大于0且小于1的数，RX_Next_Highest为当前接收到的最大序列号SN的数据包的SN加1后的值，RX_Next为所述第一设备的接收窗口中第一个未接收全的数据包的SN，LAST_UPLOAD为所述第一设备在所述接收窗口上一次滑动时递交的数据包的数量，min()为取最小值运算。
可选的，所述发送窗口的窗口长度为预设的K个长度中的一个，K为大于0的整数；
所述第一长度为所述K个长度中小于所述发送窗口调整前的窗口长度的长度。
可选的，所述第一窗口调整指示信息对应的逻辑信道或数据无线承载在所述第一设备中占用的缓存大于第三阈值；或者，所述第一窗口调整指示信息对应的逻辑信道或数据无线承载在所述第一设备中占有的缓存最大。
可选的，所述第一设备生成第一窗口调整指示信息之前，所述方法还包括：
所述第一设备确定第一定时器已经超时；
所述第一定时器为所述第一设备上一次生成窗口调整指示信息时启动的，所述第一定时器的定时时长为第一时长。
可选的，所述第一设备向所述第二设备发送所述第一窗口调整指示信息之后，所述方法还包括：
所述第一设备向所述第二设备发送第二窗口调整指示信息；
所述第二窗口调整指示信息用于指示所述第二设备将所述发送窗口的窗口长度调整 为第二长度，所述第二长度大于所述第一长度，或者所述第二长度小于所述第一长度。
可选的，所述第二长度大于所述第一长度时，所述第一设备向所述第二设备发送第二窗口调整指示信息之前，所述方法还包括：
所述第一设备确定满足以下一项或多项预设条件：
所述第一设备的接收缓冲区的空闲缓存的大小大于第四阈值；
所述第一设备的接收缓冲区的占用缓存的大小小于第五阈值；
所述第一设备接收的数据速率小于预设速率。
可选的，所述第一设备在发送所述第一窗口调整指示信息时，若确定所述接收窗口对应的重排序定时器已经启动，则将所述重排序定时器状态变量的取值确定为所述接收窗口的滑动边界；所述滑动边界位于所述接收窗口内，且所述滑动边界与所述接收窗口的起始边界之间的长度为所述发送窗口的窗口长度。
可选的，所述第一设备向所述第二设备发送所述第一窗口调整指示信息之后，所述方法还包括：
所述第一设备在启动接收窗口对应的重排序定时器时，根据以下方式确定重排序定时器状态变量，所述重排序定时器状态变量为触发与所述接收窗口对应的重排序定时器启动的数据包的SN：
若RX_Next_Highest位于所述接收窗口的滑动边界内，则将所述重排序定时器状态变量的取值确定为RX_Next_Highest，其中，RX_Next_Highest为当前接收到的最大序列号SN的数据包的SN加1后的值；所述滑动边界位于所述接收窗口内，且所述滑动边界与所述接收窗口的起始边界之间的长度为所述发送窗口的窗口长度；
或者，若RX_Next_Highest位于所述接收窗口的滑动边界外，则将所述重排序定时器状态变量的取值确定为所述接收窗口的滑动边界。
可选的，所述第一设备向所述第二设备发送所述第一窗口调整指示信息，包括：
所述第一设备通过无线资源控制RRC信令向所述第二设备发送所述第一窗口调整指示信息；
或者，所述第一设备通过无线链路控制RLC层控制消息向所述第二设备发送所述第一窗口调整指示信息；
或者，所述第一设备通过媒体介入控制MAC控制元素CE向所述第二设备发送所述第一窗口调整指示信息。
第二方面，本申请实施例提供了一种通信装置，所述通信装置可以执行上述任意一种方法。
在一种可能的设计中，上述装置包括一个或多个处理器和通信单元。所述一个或多个处理器被配置为支持所述装置执行上述方法中第一设备相应的功能。例如，生成第一窗口调整指示信息。所述通信单元用于支持所述装置与其他设备通信，实现接收和/或发送功能。例如，发送第一窗口调整指示信息。
可选的，所述装置还可以包括一个或多个存储器，所述存储器用于与处理器耦合，其保存网络设备必要的程序指令和/或数据。所述一个或多个存储器可以和处理器集成在一起，也可以与处理器分离设置。本申请并不限定。
所述装置可以为基站，gNB或TRP等，所述通信单元可以是收发器，或收发电路。可选的，所述收发器也可以为输入/输出电路或者接口。
所述装置还可以为通信芯片。所述通信单元可以为通信芯片的输入/输出电路或者接口。
另一个可能的设计中，上述装置，包括收发器、处理器和存储器。该处理器用于控制收发器收发信号，该存储器用于存储计算机程序，该处理器用于运行存储器中的计算机程序，使得该装置执行第一方面或第一方面中任一种可能实现方式中第一设备完成的方法。
在一种可能的设计中，上述装置包括一个或多个处理器和通信单元。所述一个或多个处理器被配置为支持所述装置执行上述方法中第一设备相应的功能。例如，生成第一窗口调整指示信息。所述通信单元用于支持所述装置与其他设备通信，实现接收和/或发送功能。例如，向第二设备发送所述第一窗口调整指示信息。
可选的，所述装置还可以包括一个或多个存储器，所述存储器用于与处理器耦合，其保存装置必要的程序指令和/或数据。所述一个或多个存储器可以和处理器集成在一起，也可以与处理器分离设置。本申请并不限定。
所述装置可以为智能终端或者可穿戴设备等，所述通信单元可以是收发器，或收发电路。可选的，所述收发器也可以为输入/输出电路或者接口。
所述装置还可以为通信芯片。所述通信单元可以为通信芯片的输入/输出电路或者接口。
另一个可能的设计中，上述装置，包括收发器、处理器和存储器。该处理器用于控制收发器收发信号，该存储器用于存储计算机程序，该处理器用于运行该存储器中的计算机程序，使得该装置执行第二方面或第二方面中任一种可能实现方式中终端完成的方法。
第三方面，提供了一种***，该***包括上述第一设备和第二设备。
第四方面，提供了一种计算机可读存储介质，用于存储计算机程序，该计算机程序包括用于执行第一方面或第一方面中任一种可能实现方式中的方法的指令。
第五方面，提供了一种计算机可读存储介质，用于存储计算机程序，该计算机程序包括用于执行第二方面或第二方面中任一种可能实现方式中的方法的指令。
第六方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码在计算机上运行时，使得计算机执行上述第一方面或第一方面中任一种可能实现方式中的方法。
第七方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码在计算机上运行时，使得计算机执行上述第一方面及第一方面中任一种可能实现方式中的方法。
第八方面，本申请实施例提供一种通信方法，所述方法包括：
第二设备接收第一设备发送的第一窗口调整指示信息；所述第一窗口调整指示信息用于指示所述第二设备减少发送窗口的窗口长度；所述发送窗口的窗口长度与所述第二设备一次最多调度的数据包的数量成正比；所述第一窗口调整指示信息为所述第一设备在确定数据包处理能力达到所述第一设备的处理上限时生成的；
所述第二设备根据所述第一窗口调整指示信息调整所述发送窗口的窗口长度。
根据上述方法，第二设备在接收到第一窗口调整指示信息之后，根据第一窗口调整指示信息减少发送窗口的窗口长度，从而减少向第二设备一次最多发送的数据包，从而减少第二设备接收到的数据包的数量，从而使得第一设备接收到的数据包能够及时得到处理，从而降低接收端数据包丢弃的概率。
可选的，所述发送窗口调整前的窗口长度为M，M大于0；
所述发送窗口调整后的窗口长度为第一长度；
所述第一长度为α×M，或者，所述第一长度满足以下公式：
P＝α×min((RX_Next_Highest-RX_Next+LAST_UPLOAD)，M)
其中，P为所述第一长度，α为大于0且小于1的数，RX_Next_Highest为当前接收到的最大序列号SN的数据包的SN加1后的值，RX_Next为所述第一设备的接收窗口中第一个未接收全的数据包的SN，LAST_UPLOAD为所述第一设备在所述接收窗口上一次滑动时递交的数据包的数量，min()为取最小值运算。
可选的，所述发送窗口的窗口长度为预设的K个长度中的一个，K为大于0的整数；
所述第一长度为所述K个长度中小于所述发送窗口调整前的窗口长度的最大长度。
可选的，所述发送窗口对应的逻辑信道的数据信令承载在所述第一设备中占用的缓存大于第三阈值。
可选的，所述第二设备根据所述第一窗口调整指示信息调整所述发送窗口的窗口长度之后，所述方法还包括：
所述第二设备接收所述第一设备发送的状态报告，所述状态报告指示出所述第一设备从所述第二设备接收到的至少一个数据包中每个数据包是否接收成功；
所述第二设备若根据所述状态报告确定所述至少一个数据包中位于所述发送窗口内的数据包接收失败，则重传接收失败的数据包；
或者，所述第二设备若根据所述状态报告确定所述至少一个数据包中位于所述发送窗口外的数据包接收失败，则标记接收失败且位于所述发送窗口外的数据包，并在确定标记的数据包位于滑动后的所述发送窗口内时，重传所述标记的数据包。
可选的，所述第二设备根据所述第一窗口调整指示信息调整所述发送窗口的窗口长度之后，所述方法还包括：
所述第二设备接收所述第一设备发送的第二窗口调整指示信息；
所述第二窗口调整指示信息用于指示所述第二设备将所述发送窗口的窗口长度调整为第二长度，所述第二长度大于所述第一长度，或者所述第二长度小于所述第一长度；
所述第二设备根据所述第二窗口调整指示信息调整所述发送窗口的窗口长度。
第九方面，本申请实施例提供了一种通信装置，所述通信装置可以执行上述任意一种方法。
在一种可能的设计中，上述装置包括一个或多个处理器和通信单元。所述一个或多个处理器被配置为支持所述装置执行上述方法中接入网设备相应的功能。例如，生成第一窗口调整指示信息。所述通信单元用于支持所述装置与其他设备通信，实现接收和/或发送功能。例如，发送第一窗口调整指示信息。
可选的，所述装置还可以包括一个或多个存储器，所述存储器用于与处理器耦合，其保存接入网设备必要的程序指令和/或数据。所述一个或多个存储器可以和处理器集成在一起，也可以与处理器分离设置。本申请并不限定。
所述装置可以为基站，gNB或TRP等，所述通信单元可以是收发器，或收发电路。可选的，所述收发器也可以为输入/输出电路或者接口。
所述装置还可以为通信芯片。所述通信单元可以为通信芯片的输入/输出电路或者接口。
另一个可能的设计中，上述装置，包括收发器、处理器和存储器。该处理器用于控制收发器收发信号，该存储器用于存储计算机程序，该处理器用于运行存储器中的计算机程序，使得该装置执行第八方面或第八方面中任一种可能实现方式中第二设备完成的方法。
在一种可能的设计中，上述装置包括一个或多个处理器和通信单元。所述一个或多个处理器被配置为支持所述装置执行上述方法中第二设备相应的功能。例如，根据所述第一窗口调整指示信息调整所述发送窗口的窗口长度。所述通信单元用于支持所述装置与其他设备通信，实现接收和/或发送功能。例如，通过所述资源传输控制信息。
可选的，所述装置还可以包括一个或多个存储器，所述存储器用于与处理器耦合，其保存装置必要的程序指令和/或数据。所述一个或多个存储器可以和处理器集成在一起，也可以与处理器分离设置。本申请并不限定。
所述装置可以为智能终端或者可穿戴设备等，所述通信单元可以是收发器，或收发电路。可选的，所述收发器也可以为输入/输出电路或者接口。
所述装置还可以为通信芯片。所述通信单元可以为通信芯片的输入/输出电路或者接口。
第十方面，提供了一种计算机可读存储介质，用于存储计算机程序，该计算机程序包括用于执行第八方面或第八方面中任一种可能实现方式中的方法的指令。
第十一方面，提供了一种计算机可读存储介质，用于存储计算机程序，该计算机程序包括用于执行第八方面或第八方面中任一种可能实现方式中的方法的指令。
第十二方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码在计算机上运行时，使得计算机执行上述第八方面或第八方面中任一种可能实现方式中的方法。
附图说明
图1示出了适用于本申请实施例的通信方法的通信***的示意图；
图2为本申请实施例提供的一种通信方法流程示意图；
图3为本申请实施例提供的一种消息结构示意图；
图4为本申请实施例提供的一种消息结构示意图；
图5为本申请实施例提供的一种消息结构示意图；
图6为本申请实施例提供的一种消息结构示意图；
图7为本申请实施例提供的一种消息结构示意图；
图8为本申请实施例提供的一种窗口结构示意图；
图9为本申请实施例提供的一种通信方法流程示意图；
图10为本申请实施例提供的一种通信方法流程示意图；
图11为本申请实施例提供的一种通信方法流程示意图；
图12为本申请实施例提供的一种通信方法流程示意图；
图13为本申请实施例提供的一种终端结构示意图；
图14为本申请实施例提供的一种接入网设备结构示意图；
图15为本申请实施例提供的一种通信装置结构示意图。
具体实施方式
下面结合说明书附图对本申请实施例做详细描述。
本申请实施例可以应用于各种移动通信***，例如：新无线(new radio，NR)***、全球移动通讯(global system of mobile communication，GSM)***、码分多址(code division  multiple access，CDMA)***、宽带码分多址(wideband code division multiple access，WCDMA)***、通用分组无线业务(general pcket radio service，GPRS)、长期演进(long term evolution，LTE)***、先进的长期演进(advanced long term evolution，LTE-A)***、通用移动通信***(universal mobile telecommunication system，UMTS)、演进的长期演进(evolved long term evolution，eLTE)***、未来通信***等其它通信***，具体的，在此不做限制。
为便于理解本申请实施例，首先以图1中示出的通信***为例详细说明适用于本申请实施例的通信***。图1示出了适用于本申请实施例的通信方法的通信***的示意图。如图1所示，该通信***100包括网络设备102和终端设备106，网络设备102可配置有多个天线，终端设备也可配置有多个天线。可选地，该通信***还可包括网络设备104，网络设备104也可配置有多个天线。
应理解，网络设备102或网络设备104还可包括与信号发送和接收相关的多个部件(例如，处理器、调制器、复用器、解调器或解复用器等)。
本申请实施例中，终端，为具有无线收发功能的设备或可设置于该设备的芯片，也可以称为用户设备(user equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。本申请的实施例中的终端可以是手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端、增强现实(augmented reality，AR)终端、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等等。本申请的实施例对应用场景不做限定。本申请中将前述终端及可设置于前述终端的芯片统称为终端。
网络设备，为具有无线收发功能的设备或可设置于该设备的芯片，该设备包括但不限于：演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(baseband unit，BBU)，无线保真(wireless fidelity，WIFI)***中的接入点(access point，AP)、无线中继节点、无线回传节点、传输点(transmission and reception point，TRP或者transmission point，TP)等，还可以为5G，如，NR，***中的gNB，或，传输点(TRP或TP)，5G***中的基站的一个或一组(包括多个天线面板)天线面板，或者，还可以为构成gNB或传输点的网络节点，如基带单元(BBU)，或，分布式单元(DU，distributed unit)等。
在一些部署中，gNB可以包括集中式单元(centralized unit，CU)和DU。gNB还可以包括射频单元(radio unit，RU)。CU实现gNB的部分功能，DU实现gNB的部分功能，比如，CU实现无线资源控制(radio resource control，RRC)，分组数据汇聚层协议(packet data convergence protocol，PDCP)层的功能，DU实现无线链路控制(radio link control，RLC)、媒体接入控制(media access control，MAC)和物理(physical，PHY)层的功能。由于RRC层的信息最终会变成PHY层的信息，或者，由PHY层的信息转变而来，因而，在这种架构下，高层信令，如RRC层信令或PHCP层信令，也可以认为是由DU发送的， 或者，由DU+RU发送的。可以理解的是，网络设备(包括网络设备)可以为CU节点、或DU节点、或包括CU节点和DU节点的设备。此外，CU可以划分为接入网RAN中的网络设备，也可以将CU划分为核心网CN中的网络设备，在此不做限制。
本申请将围绕可包括多个设备、组件、模块等的***来呈现各个方面、实施例或特征。应当理解和明白的是，各个***可以包括另外的设备、组件、模块等，并且/或者可以并不包括结合附图讨论的所有设备、组件、模块等。此外，还可以使用这些方案的组合。
另外，在本申请实施例中，“示例的”一词用于表示作例子、例证或说明。本申请中被描述为“示例”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用示例的一词旨在以具体方式呈现概念。
本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
参见图2，为本申请实施例提供的一种通信方法流程示意图。
该方法包括：
步骤201：第一设备接收第二设备发送的数据包，并在确定数据包处理能力达到所述第一设备的处理上限时，生成第一窗口调整指示信息；所述第一窗口调整指示信息用于指示所述第二设备减少发送窗口的窗口长度；所述发送窗口的窗口长度与所述第二设备一次最多调度的数据包的数量成正比。
需要说明的是，第二设备向第一设备发送的数据包数量为至少一个。
步骤202：所述第一设备向所述第二设备发送所述第一窗口调整指示信息。
步骤203：第二设备接收第一设备发送的第一窗口调整指示信息；所述第一窗口调整指示信息为所述第一设备在确定数据包处理能力达到所述第一设备的处理上限时生成的。
步骤204：所述第二设备根据所述第一窗口调整指示信息调整所述发送窗口的窗口长度。
图2所示的流程中，第二设备的RLC实体可以采用确认模式向第一设备发送数据包，本申请实施例中的数据包可以是指RLC PDU等。第一设备可以为终端，也可以为网络设备等通信设备；第二设备可以为终端，也可以为网络设备等通信设备，本申请实施例对此并不限定。
需要说明的是，RLC实体采用确认模式传输数据包时，接收端的RLC实体维护一个接收窗口，发送端的RLC实体维护一个发送窗口。其中，接收窗口和发送窗口与现有的重排序窗口或重组窗口的功能以及原理类似，用于重传和补齐空口丢失的数据包，并按序向上层递交收到的数据包。例如，发送端在发送数据包时，将发送窗口内的数据包按序排列，并在确定发送窗口内的数据包均按序发送到接收端时，滑动发送窗口，从而保证数据包按照数据包的序号递增的顺序发送。发送端每次最多发送的数据包的数量为发送窗口的窗口长度限定的数量。
步骤201中，所述第一设备确定满足以下一项或多项预设条件时，所述第一设备确定数据包处理能力达到所述第一设备的处理上限：
1、所述第一设备的接收缓冲区的空闲缓存的大小小于第一阈值。
接收缓冲区可以是指PDCP缓冲区、RLC缓冲区、网卡的缓冲区、应用程序的缓冲区 等，第一阈值的取值可以根据实际情况确定，例如第一阈值可以为接收缓冲区的总量的20％等，在此不再赘述。
2、所述第一设备的接收缓冲区发生数据溢出。其中，接收缓冲区可以是指PDCP缓冲区等。
在该条件下，第一设备的RLC实体向PDCP实体递交数据包时，携带RLC实体信息，包括逻辑信道标识等。
3、所述第一设备确定没有空闲的资源处理接收到的数据包。具体的，第一设备中的网卡或者传输控制协议/因特网互联协议(Transmission Control Protocol/Internet Protocol，TCP/IP)栈或者应用等检测到发生丢包，或者检测到第一设备的处理器负载很重，则可以确定没有空闲的资源处理接收到的数据包。所述空闲的资源可以是指存储资源、处理器资源等。
4、所述第一设备的接收缓冲区的占用缓存的大小大于第二阈值。
在第一设备确定满足上述一项或多项预设条件时，确定需要减少发送窗口的窗口长度。可选的，第一设备可以先确定出占用的缓存大于第三阈值的数据无线承载(data radio bearer，DRB)或者逻辑信道，或者，确定占用缓存最大的逻辑信道或DRB，然后将第二设备中与该逻辑信道或数据无线承载对应的发送窗口作为需要调整的发送窗口，即所述第一窗口调整指示信息对应的逻辑信道或数据无线承载在所述第一设备中占用的缓存大于第三阈值。其中，第三阈值的取值可以根据实际情况确定，在此不再赘述。
可选的，第一设备生成第一窗口调整指示信息之前，需要确定第一定时器是否超时。第一设备确定第一定时器已经超时，生成第一窗口调整指示信息，否则不再生成第一窗口调整指示信息。所述第一定时器为所述第一设备上一次生成窗口调整指示信息时启动，所述第一定时器的定时时长为第一时长，第一时长的具体取值可以根据实际情况确定，在此不再逐一举例说明。其中，上一次生成的窗口调整指示信息可以是用来调整第二设备的发送窗口的信息。
本申请实施例中，第一窗口调整指示信息可以指示发送窗口的窗口长度为第一长度，所述第一长度小于所述发送窗口调整前的窗口长度。具体的，第一设备生成第一窗口调整指示信息之前，可以先确定一个小于发送窗口调整前的窗口长度的第一长度。第一设备可以通过多种方式确定第一长度。
若所述发送窗口调整前的窗口长度为M，M大于0，一种可能的实现方式中，第一设备确定的所述第一长度满足以下公式：
P＝α×M······(1)
其中，P为所述第一长度，α为大于0且小于1的数，α的取值可以根据实际情况确定，在此不再逐一举例说明。
另一种可能的实现方式中，第一设备确定的所述第一长度满足以下公式：
P＝α×min((RX_Next_Highest-RX_Next+LAST_UPLOAD)，M)······(2)
其中，P为所述第一长度，α为大于0且小于1的数，RX_Next_Highest为当前接收到的最大序列号(Serial Number，SN)的数据包的SN加1后的值，RX_Next为所述第一设备的接收窗口中第一个未接收全的数据包的SN，LAST_UPLOAD为所述第一设备在所述接收窗口上一次滑动时递交的数据包的数量，min()为取最小值运算。
另一种可能的实现方式中，发送窗口的窗口长度为预设的K个长度中的一个，K为大 于0的整数。此时，所述第一长度为所述K个长度中小于所述发送窗口调整前的窗口长度的长度。例如，发送窗口的窗口长度为预设的五个长度中的一个长度，依次从小到大为：L0、L3、L4、L5、L6、L7。发送窗口调整前的窗口长度为L5时，第一设备确定数据包处理能力达到所述第一设备的处理上限时，确定出的第二长度为L4。
可选的，预设的K个长度可以位于第一窗口长度集合中。在减小发送窗口的长度时，可以从第一窗口长度集合中选取一个窗口长度作为发送窗口调整后的窗口长度。
具体的，第一窗口长度集合中包括K个窗口长度，K为大于0的整数。在减少发送窗口的长度时，可以将第一窗口长度集合中，小于发送窗口调整前的窗口长度的长度作为发送窗口调整后的窗口长度，即第一长度。
举例来说，第一窗口长度集合中包括5个窗口长度，分别为：2 17，2 14，2 13，2 12，2 11，2 10；对应的索引值依次为：0，3，4，5，6，7。发送窗口调整前的窗口长度为2 14，在减小发送窗口的窗口长度时，将第一窗口长度集合中小于2 14的最大窗口长度，即2 13作为发送窗口调整后的窗口长度，即第一长度。
本申请实施例中，第一窗口调整指示信息可以直接指示出第一长度，也可以间接指示出第一长度。第一窗口调整指示信息直接指示出第一长度时，可以为第一长度的取值，例如第一设备将发送窗口的窗口长度调整为长度为2 16，则第一窗口调整指示信息为2 16；第一窗口调整指示信息间接指示出第一长度时，可以为第一长度的索引值，例如，第一设备将发送窗口的窗口长度调整为长度为2 16，2 16对应的索引值为5，则第一窗口调整指示信息为5，当然窗口长度与索引值的预设关系需要提前约定，具体如何约定，在此不再赘述。
步骤202中，所述第一设备向所述第二设备发送所述第一窗口调整指示信息的具体实现方式，可以有多种，第一种可能的实现方式中，所述第一设备通过RRC信令向所述第二设备发送所述第一窗口调整指示信息。
第二种可能的实现方式中，所述第一设备通过RLC层控制消息向所述第二设备发送所述第一窗口调整指示信息。
在该实现方式中，第一窗口调整指示信息直接指示出第一长度时，RLC层控制消息的具体格式可以参考图3所示。图3中，RLC层控制消息包括数据/控制(data/control，D/C)字段，控制PDU类别(control PDU type，CPT)字段，窗口长度(window size)字段，保留(reversed，R)字段。其中，D/C字段用于指示该报文是数据报文还是控制报文；CPT字段用于指示报文的类别；窗口长度字段中承载第一窗口指示信息。
第一窗口调整指示信息间接指示出第一长度时，RLC层控制消息的具体格式可以参考图4所示。图4中，RLC层控制消息包括D/C字段，CPT字段，窗口等级(window level)字段，R字段。其中，D/C字段用于指示该报文是数据报文还是控制报文；CPT字段用于指示报文的类别；窗口等级字段中承载第一窗口指示信息。例如，第一窗口调整指示信息指示出的第一长度的索引值为5，对应的长度为2 16，则窗口等级字段中承载的第一窗口指示信息为5。
可选的，RLC层控制消息中还可以包括方向(direction，DIR)字段，用于指示上行方向的窗口还是下行方向的窗口。具体可以参考图5所示。
当然，图3至图5只是示例，RLC层控制消息还可以有其他形式，在此不再赘述。
第三种可能的实现方式中，所述第一设备通过MAC控制元素(Control Element，CE)向所述第二设备发送所述第一窗口调整指示信息。
在该实现方式中，第一窗口调整指示信息直接指示出第一长度时，MAC CE的具体格式可以参考图6所示。图6中，MAC CE包括R字段，逻辑信道标识(logical channel identify，LCID)字段，目标逻辑信道标识(object logical channel identify，O_LCID)字段，窗口长度字段。其中，窗口长度字段中承载第一窗口指示信息；O_LCID字段用于指示发送窗口对应的逻辑信道，其他字段的含义可以参考前面的描述，在此不再赘述。
在该实现方式中，第一窗口调整指示信息间接指示出第一长度时，MAC CE的具体格式可以参考图7所示。图7中，MAC CE包括R字段，LCID字段，O_LCID字段，窗口等级字段，DIR字段。其中，窗口等级字段中承载第一窗口指示信息，例如，第一窗口调整指示信息指示出的第一长度的索引值为5，对应的长度为2 16，则窗口等级字段中承载的第一窗口指示信息为5；O_LCID字段用于指示发送窗口对应的逻辑信道，其他字段的含义可以参考前面的描述，在此不再赘述。
当然，图6至图7只是示例，MAC CE还可以有其他形式，在此不再赘述。
可选的，第一设备向所述第二设备发送所述第一窗口调整指示信息的同时，还可以启动第二定时器，第二定时器的定时时长为第二时长，第二时长的取值可以根据实际情况确定，在此不再赘述。
第一设备在第二定时器超时之前，不再调整所述发送窗口的窗口长度，从而避免了信令风暴的产生。
可选的，本申请实施例中，所述第一设备向所述第二设备发送所述第一窗口调整指示信息之后，所述第一设备还可以根据实际情况对所述发送窗口的窗口长度进行调整。举例来说，所述第一设备还可以向所述第二设备发送第二窗口调整指示信息；所述第二窗口调整指示信息用于指示所述第二设备将所述发送窗口的窗口长度调整为第二长度，所述第二长度大于所述第一长度，或者所述第二长度小于所述第一长度。
当第一设备确定数据包处理能力达到所述第一设备的处理上限时，第二长度小于所述第一长度；相应的，当第一设备确定数据包处理能力未达到所述第一设备的处理上限时，第二长度大于所述第一长度。
本申请实施例中，所述第一设备确定满足以下一项或多项预设条件时，可以确定数据包处理能力未达到所述第一设备的处理上限：
所述第一设备的接收缓冲区的空闲缓存的大小大于第四阈值；
所述第一设备的接收缓冲区的占用缓存的大小小于第五阈值；
所述第一设备接收的数据速率小于预设速率。
其中，第四阈值、第五阈值、预设速率的取值，可以根据实际情况确定，在此不再赘述。
可选的，第二长度大于所述第一长度时，第二长度可以满足以下公式：
T＝β×P······(3)
其中，T为所述第二长度，P为所述第一长度，β为大于1的数，β的取值可以根据实际情况确定，在此不再逐一举例说明。
可选的，本申请实施例中，在增加发送窗口的长度时，可以从第二窗口长度集合中选取一个窗口长度。
具体的，第二窗口长度集合中包括Q个窗口长度，Q为大于0的整数。在增加发送窗口的长度时，可以将第二窗口长度集合中，大于发送窗口调整前的窗口长度的长度作为第 二长度。
举例来说，第二窗口长度集合中包括8个窗口长度，分别为：2 17，2 16，2 15，2 14，2 13，2 12，2 11，2 10；对应的索引值依次为：0，1，2，3，4，5，6，7。发送窗口调整前的窗口长度为2 14，在增加发送窗口的窗口长度时，将第二窗口长度集合中大于2 14的最小窗口长度，即2 15作为发送窗口调整后的窗口长度，即第二长度。
可选的，所述第一设备启动第二定时器时，所述第一设备在第二定时器超时之后，向所述第二设备发送第二窗口指示信息。
第一设备发送第二窗口指示信息的具体实现方式，可以参考发送第一窗口指示信息中的描述，在此不再赘述。
本申请实施例中，数据包的接收端，即第一设备也会维护一个接收窗口，接收窗口指定了在不向前移动该接收窗口的前提下，第一设备能够接收的数据包的数量。如果接收窗口向前移动，则滑出接收窗口之外的任一数据包，不管其状态如何，都需要进行重组。接收窗口的功能和定义可以参考现有技术中关于重排序窗口或重组窗口的描述。接收窗口对应一个重排序定时器，重排序定时器对应一个重排序定时器状态变量，所述重排序定时器状态变量为触发与所述接收窗口对应的重排序定时器启动的数据包的SN。当启动重排序定时器时，表示存在序列号小于重排序定时器状态变量的数据包还未接收到，此时要等待接收这些数据包，直至重排序定时器超时。
可选的，所述第一设备在需要启动接收窗口对应的重排序定时器时，可以根据以下方式确定重排序定时器状态变量：
若RX_Next_Highest位于所述接收窗口的滑动边界内，则将所述重排序定时器状态变量的取值确定为RX_Next_Highest。其中，RX_Next_Highest为当前接收到的最大序列号SN的数据包的SN加1后的值；所述滑动边界位于所述接收窗口内，且所述滑动边界与所述接收窗口的起始边界之间的长度为所述发送窗口的窗口长度。所述接收窗口的起始边界为所述第一设备的接收窗口中第一个未接收全的数据包的SN。
需要说明的是，RX_Next_Highest位于所述接收窗口的滑动边界内，是指RX_Next_Highest的取值大于或等于所述接收窗口的起始边界，且小于或等于所述接收窗口的滑动边界。
举例来说，如图8所示，为本申请实施例提供的一种接收窗口示意图。第二设备的发送窗口的窗口长度为M，第一设备的接收窗口的起始边界为N+1，第一设备的接收窗口的滑动边界为N+M。第一设备在启动接收窗口对应的重排序定时器时，RX_Next_Highest位于所述接收窗口的滑动边界内，即RX_Next_Highest为大于或等于N+1且小于或等于N+M时，位于所述接收窗口的滑动边界内，重排序定时器状态变量的取值为RX_Next_Highest。
若RX_Next_Highest位于所述接收窗口的滑动边界外，则将所述重排序定时器状态变量的取值确定为所述接收窗口的滑动边界。其中，RX_Next_Highest位于所述接收窗口的滑动边界外，可以是指RX_Next_Highest大于所述接收窗口的滑动边界。
结合图8，RX_Next_Highest大于N+M时，重排序定时器状态变量的取值为N+M。
所述第一设备在发送所述第一窗口调整指示信息时，若所述接收窗口对应的重排序定时器已经启动，则将所述重排序定时器状态变量的取值确定为所述接收窗口的滑动边界。
结合图8，第一设备在发送第一窗口调整指示信息时，确定接收窗口对应的重排序定 时器已经启动，则将重排序定时器状态变量的取值确定为N+M。
步骤204中，第二设备接收到第一窗口调整指示信息之后，将发送窗口的窗口减小。需要说明的是，发送窗口指定了在不向前移动该发送窗口的前提下，第二设备能够发送的数据包的数量。
可选的，所述第二设备根据所述第一窗口调整指示信息调整所述发送窗口的窗口长度之后，所述第二设备还可能接收到所述第一设备发送的状态报告，所述状态报告指示出所述第一设备从所述第二设备接收到的至少一个数据包中每个数据包是否接收成功。需要说明的是，所述至少一个数据包为通过所述发送窗口对应的逻辑信道发送的。
所述第二设备若根据所述状态报告确定所述至少一个数据包中位于所述发送窗口内的数据包接收失败，则重传接收失败的数据包。
相应的，所述第二设备若根据所述状态报告确定所述至少一个数据包中位于所述发送窗口外的数据包接收失败，则暂时不重传这些数据包，而是标记接收失败且位于所述发送窗口外的数据包，并在确定标记的数据包位于滑动后的所述发送窗口内时，重传所述标记的数据包。
可选的，所述第二设备根据所述第一窗口调整指示信息调整所述发送窗口的窗口长度之后，还可能接收所述第一设备发送的第二窗口调整指示信息；所述第二窗口调整指示信息用于指示所述第二设备将所述发送窗口的窗口长度调整为第二长度，所述第二长度大于所述第一长度，或者所述第二长度小于所述第一长度。
所述第二设备根据所述第二窗口调整指示信息调整所述发送窗口的窗口长度。
下面通过具体的实施例描述前面的过程。
实施例1
第一设备的接收窗口的窗口长度初始化时为M，第二设备的发送窗口的窗口长度初始化时为M，举例来说，M可以为2 17。
第二设备向第一设备发送数据包。第一设备的RLC层接收到数据包之后，第一设备的RLC层向第一设备的PDCP层递交数据包时，携带RLC实体信息，数据包的逻辑信道标识等信息。
步骤901：第一设备的接收缓冲区的空闲缓存的大小小于第一阈值时，第一设备确定数据包处理能力达到所述第一设备的处理上限。
步骤902：第一设备的PDCP层指示第一设备的RLC层减小第二设备的发送窗口的窗口长度。
第一设备可以将占用的缓存大于第三阈值的数据无线承载对应的逻辑信道的发送窗口作为需要调整的发送窗口。在该条件下，第一设备的PDCP层可以指示所述数据无线承载对应的逻辑信道的RLC实体，减小所述数据无线承载对应的逻辑信道的发送窗口。
步骤903：第一设备确定第一窗口调整指示信息。
具体的，第一设备的RLC实体可以先确定调整后的第二设备的发送窗口的窗口长度，即第一长度。
从发送窗口的初始窗口首次调整时，第一设备可以根据公式(2)确定第一长度；若不是从发送窗口的初始窗口进行调整，第一设备可以根据公式(1)确定第一长度。
第一设备通过第一窗口调整指示信息直接指示第一长度，此时第一窗口调整指示信息为第一长度的取值。
步骤904：第一设备向第二设备发送第一窗口调整指示信息，并启动第二定时器。
具体的，第一设备可以通过第一设备的RLC实体生成RLC层控制消息，并通过RLC层控制消息发送第一窗口调整指示信息。RLC层控制消息的结构可以参考图3至图5，在此不再赘述。
步骤905：第二设备根据第一窗口调整指示信息调整发送窗口的窗口长度。
第二设备发送的数据包和重传的数据包都不超出调整后的发送窗口的窗口长度的范围。
步骤906：第一设备向第二设备发送状态报告。
步骤907：第二设备根据所述状态报告，进行数据包重传。
具体的，所述第二设备若根据所述状态报告确定所述至少一个数据包中位于所述发送窗口内的数据包接收失败，则重传接收失败的数据包。相应的，所述第二设备若根据所述状态报告确定所述至少一个数据包中位于所述发送窗口外的数据包接收失败，则暂时不重传这些数据包，而是标记接收失败且位于所述发送窗口外的数据包，并在确定标记的数据包位于滑动后的所述发送窗口内时，重传所述标记的数据包。
若第二定时器超时后，第一设备的接收缓冲区的空闲缓存的大小仍然小于第一阈值，第一设备在上次减少的发送窗口的窗口长度的基础上,再次减小第二设备的发送窗口的窗口长度。
具体的，步骤908：第一设备向第二设备发送第二窗口调整指示信息，并启动第二定时器。
所述第二窗口调整指示信息用于指示所述第二设备将所述发送窗口的窗口长度调整为第二长度，所述第二长度小于所述第一长度。
所述第二长度可以通过公式(1)确定。
步骤909：第二设备根据第二窗口调整指示信息调整发送窗口的窗口长度。
若第二定时器超时后，第一设备的接收缓冲区的空闲缓存的大小大于第四阈值时，第一设备确定需要增加第二设备的发送窗口,从而可以在上次减少的发送窗口的窗口长度的基础上,增加第二设备的发送窗口的窗口长度。
需要说明的是，此时第一设备的接收缓冲区可以是指RLC层接收缓冲区，也可以是指PDCP层接收缓冲区。
具体的，步骤910：第一设备向第二设备发送第三窗口调整指示信息，所述第二窗口调整指示信息用于指示所述第二设备将所述发送窗口的窗口长度调整为第三长度，所述第三长度大于所述第二长度。
所述第三长度可以通过公式(3)确定。
第一设备发送第二窗口调整指示信息的同时，还可以再次启动第二定时器。
步骤911：第二设备根据第三窗口调整指示信息调整发送窗口的窗口长度。
第二设备发送的数据包和重传的数据包都不超出调整后的发送窗口的窗口长度的范围。
实施例2
第一设备的接收窗口的窗口长度初始化时为M，第二设备的发送窗口的窗口长度初始化时为M，举例来说，M可以为2 17。
第二设备向第一设备发送数据包。第一设备的RLC层接收到数据包之后，第一设备的 RLC层向第二设备的PDCP层递交数据包时，携带RLC实体信息，数据包的逻辑信道标识等信息。
步骤1001：第一设备的接收缓冲区发生数据溢出时，发生数据包丢包，此时，第一设备确定数据包处理能力达到所述第一设备的处理上限。
在该条件下，第一设备的RLC实体向PDCP实体递交数据包时，携带RLC实体信息，包括逻辑信道标识等。第一设备的接收缓冲区发生数据溢出时，第一设备的PDCP实体通知第一设备的RLC实体丢包相关信息，如果第一设备的RLC实体还没有给第二设备确认过对应数据包已经接收到，则可以继续等待第二设备重传上述丢包。
步骤1002：第一设备的PDCP层指示第一设备的RLC层减小第二设备的发送窗口的窗口长度。
第一设备可以将占用的缓存大于第三阈值的数据无线承载对应的逻辑信道的发送窗口作为需要调整的发送窗口。在该条件下，第一设备的PDCP层可以指示所述数据无线承载对应的逻辑信道的RLC实体，减小所述数据无线承载对应的逻辑信道的发送窗口。
步骤1003：第一设备确定第一窗口调整指示信息。
具体的，第一设备的RLC实体可以先确定调整后的第二设备的发送窗口的窗口长度，即第一长度。
从发送窗口的初始窗口首次调整时，第一设备可以根据公式(2)确定第一长度；若不是从发送窗口的初始窗口进行调整，第一设备可以根据公式(1)确定第一长度。
第一设备通过第一窗口调整指示信息直接指示第一长度，此时第一窗口调整指示信息为第一长度的取值。
步骤1004：第一设备向第二设备发送第一窗口调整指示信息，并启动第二定时器。
具体的，第一设备的RLC实体将第一窗口调整指示信息发送至第一设备的MAC实体，第一设备的MAC实体构建MAC CE，并通过MAC CE发送第一窗口调整指示信息。MAC CE的结构可以参考图6至图7，在此不再赘述。
步骤1005：第二设备根据第一窗口调整指示信息调整发送窗口的窗口长度。
第二设备发送的数据包和重传的数据包都不超出调整后的发送窗口的窗口长度的范围。
步骤1006：第一设备向第二设备发送状态报告。
步骤1007：第二设备根据所述状态报告，进行数据包重传。
具体的，所述第二设备若根据所述状态报告确定所述至少一个数据包中位于所述发送窗口内的数据包接收失败，则重传接收失败的数据包。相应的，所述第二设备若根据所述状态报告确定所述至少一个数据包中位于所述发送窗口外的数据包接收失败，则暂时不重传这些数据包，而是标记接收失败且位于所述发送窗口外的数据包，并在确定标记的数据包位于滑动后的所述发送窗口内时，重传所述标记的数据包。
若第二定时器超时后，第一设备的接收缓冲区的空闲缓存的大小仍然小于第一阈值，第一设备在上次减少的发送窗口的窗口长度的基础上,再次减小第二设备的发送窗口的窗口长度。
具体的，步骤1008：第一设备向第二设备发送第二窗口调整指示信息，并启动第二定时器。
所述第二窗口调整指示信息用于指示所述第二设备将所述发送窗口的窗口长度调整 为第二长度，所述第二长度小于所述第一长度。
所述第二长度可以通过公式(1)确定。
步骤1009：第二设备根据第二窗口调整指示信息调整发送窗口的窗口长度。
若第二定时器超时后，第一设备的接收缓冲区的空闲缓存的大小大于第四阈值，或所述第一设备的接收缓冲区的占用缓存的大小小于第五阈值时，第一设备确定需要增加第二设备的发送窗口,从而可以在上次减少的发送窗口的窗口长度的基础上,增加第二设备的发送窗口的窗口长度。
需要说明的是，此时第一设备的接收缓冲区可以是指RLC层接收缓冲区，也可以是指PDCP层接收缓冲区。
具体的，步骤1010：第一设备向第二设备发送第三窗口调整指示信息，所述第二窗口调整指示信息用于指示所述第二设备将所述发送窗口的窗口长度调整为第三长度，所述第三长度大于所述第二长度。
所述第三长度可以通过公式(3)确定。
第一设备发送第二窗口调整指示信息的同时，还可以再次启动第二定时器。
步骤1011：第二设备根据第三窗口调整指示信息调整发送窗口的窗口长度。
第二设备发送的数据包和重传的数据包都不超出调整后的发送窗口的窗口长度的范围。
实施例3
第一设备的接收窗口的窗口长度初始化时为M，第二设备的发送窗口的窗口长度初始化时为M2。其中M为预设的值。举例来说，M可以为2 17。第二设备可以根据根据实际情况确定初始化时的发送窗口的窗口长度，在此不再赘述。举例来说，M2可以为2 12。
可选的，本申请实施例中，在减小发送窗口的长度时，可以从第一窗口长度集合中选取一个窗口长度作为发送窗口调整后的窗口长度。
具体的，第一窗口长度集合中包括K个窗口长度，K为大于0的整数。在减少发送窗口的长度时，可以将第一窗口长度集合中，小于发送窗口调整前的窗口长度的长度作为发送窗口调整后的窗口长度。
举例来说，第一窗口长度集合中包括5个窗口长度，分别为：2 17，2 14，2 13，2 12，2 11，2 10；对应的索引值依次为：0，3，4，5，6，7。发送窗口调整前的窗口长度为2 14，在减小发送窗口的窗口长度时，将第一窗口长度集合中小于2 14的最大窗口长度，即2 13，作为发送窗口调整后的窗口长度。
相应的，在增加发送窗口的长度时，可以从第二窗口长度集合中选取一个窗口长度。
具体的，第二窗口长度集合中包括Q个窗口长度，Q为大于0的整数。在增加发送窗口的长度时，可以将第二窗口长度集合中，大于发送窗口调整前的窗口长度的长度作为发送窗口调整后的窗口长度。
举例来说，第二窗口长度集合中包括8个窗口长度，分别为：2 17，2 16，2 15，2 14，2 13，2 12，2 11，2 10；对应的索引值依次为：0，1，2，3，4，5，6，7。发送窗口调整前的窗口长度为2 14，在增加发送窗口的窗口长度时，将第二窗口长度集合中大于2 14的最小窗口长度，即2 15，作为发送窗口调整后的窗口长度。
结合上面的描述，如图11所示，为本申请实施例提供的一种通信方法流程示意图。
在图11的流程之前，第二设备与网络侧激活了PDU session。
同时，图11的流程中，发送窗口的窗口长度在减少或增加时，分别通过第一窗口长度集合和第二窗口长度集合进行选择。
第一窗口长度集合中包括5个窗口长度，分别为：2 17，2 14，2 13，2 12，2 11，2 10；对应的索引值依次为：0，3，4，5，6，7。第二窗口长度集合中包括8个窗口长度，分别为：2 17，2 16，2 15，2 14，2 13，2 12，2 11，2 10；对应的索引值依次为：0，1，2，3，4，5，6，7。
步骤1101：第一设备的接收缓冲区的空闲缓存的大小小于第一阈值时，第一设备确定数据包处理能力达到所述第一设备的处理上限。
该接收缓冲区可以是指RLC层接收缓冲区。
此时，第一设备可以将占用的缓存大于第三阈值的数据无线承载对应的逻辑信道的发送窗口作为需要调整的发送窗口。
步骤1102：第一设备确定第一窗口调整指示信息。
具体的，第一设备的RLC实体可以将第一窗口长度集合中，小于发送窗口调整前的窗口长度的最大长度作为发送窗口调整后的窗口长度。结合前面的描述，第一设备的RLC实体从第一窗口长度集合中确定出的第一长度为2 11。此时，第一设备确定出的第一窗口调整指示信息可以为第一长度的取值，也可以为第一长度的索引值。
步骤1103：第一设备向第二设备发送第一窗口调整指示信息，并启动第二定时器。
具体的，第一设备可以通过第一设备的RLC实体生成RLC层控制消息，并通过RLC层控制消息发送第一窗口调整指示信息。RLC层控制消息的结构可以参考图3至图5，在此不再赘述。
步骤1104：第二设备根据第一窗口调整指示信息调整发送窗口的窗口长度。
第二设备发送的数据包和重传的数据包都不超出调整后的发送窗口的窗口长度的范围。
步骤1105：第一设备向第二设备发送状态报告。
步骤1106：第二设备根据所述状态报告，进行数据包重传。
具体的，所述第二设备若根据所述状态报告确定所述至少一个数据包中位于所述发送窗口内的数据包接收失败，则重传接收失败的数据包。相应的，所述第二设备若根据所述状态报告确定所述至少一个数据包中位于所述发送窗口外的数据包接收失败，则暂时不重传这些数据包，而是标记接收失败且位于所述发送窗口外的数据包，并在确定标记的数据包位于滑动后的所述发送窗口内时，重传所述标记的数据包。
若第二定时器超时后，第一设备的接收缓冲区的空闲缓存的大小仍然小于第一阈值，第一设备在上次减少的发送窗口的窗口长度的基础上,再次减小第二设备的发送窗口的窗口长度。
具体的，步骤1107：第一设备向第二设备发送第二窗口调整指示信息，并启动第二定时器。
所述第二窗口调整指示信息用于指示所述第二设备将所述发送窗口的窗口长度调整为第二长度，所述第二长度小于所述第一长度。结合前面的描述，第一设备的RLC实体从第一窗口长度集合中确定出的第二长度为2 10。
步骤1108：第二设备根据第二窗口调整指示信息调整发送窗口的窗口长度。
若第二定时器超时后，第一设备的接收缓冲区的空闲缓存的大小大于第四阈值时，第一设备确定需要增加第二设备的发送窗口,从而可以在上次减少的发送窗口的窗口长度的 基础上,增加第二设备的发送窗口的窗口长度。
需要说明的是，此时第一设备的接收缓冲区可以是指RLC层接收缓冲区，也可以是指PDCP层接收缓冲区。
具体的，步骤1109：第一设备向第二设备发送第三窗口调整指示信息，所述第二窗口调整指示信息用于指示所述第二设备将所述发送窗口的窗口长度调整为第三长度，所述第三长度大于所述第二长度。
结合前面的描述，第一设备的RLC实体从第二窗口长度集合中确定出的第三长度为2 11。
步骤1110：第二设备根据第三窗口调整指示信息调整发送窗口的窗口长度。
第二设备发送的数据包和重传的数据包都不超出调整后的发送窗口的窗口长度的范围。
实施例4
如图12所示，为本申请实施例提供的一种通信方法流程示意图。
在图12的流程之前，第二设备与网络侧激活了PDU session。
同时，图12的流程中，发送窗口的窗口长度在减少或增加时，分别通过第一窗口长度集合和第二窗口长度集合进行选择。
第一窗口长度集合中包括5个窗口长度，分别为：2 17，2 14，2 13，2 12，2 11，2 10；对应的索引值依次为：0，3，4，5，6，7。第二窗口长度集合中包括8个窗口长度，分别为：2 17，2 16，2 15，2 14，2 13，2 12，2 11，2 10；对应的索引值依次为：0，1，2，3，4，5，6，7。
步骤1201：第一设备的接收缓冲区的空闲缓存的大小小于第一阈值时，第一设备确定数据包处理能力达到所述第一设备的处理上限。
该接收缓冲区可以是指RLC层接收缓冲区。
此时，第一设备可以将占用的缓存大于第三阈值的数据无线承载对应的逻辑信道的发送窗口作为需要调整的发送窗口。
步骤1202：第一设备确定第一窗口调整指示信息。
结合前面的描述，第一设备的RLC实体从第一窗口长度集合中确定出的第一长度为2 11。此时，第一设备确定出的第一窗口调整指示信息可以为第一长度的取值，也可以为第一长度的索引值。
步骤1203：第一设备向第二设备发送第一窗口调整指示信息，并启动第二定时器。
具体的，第一设备的RLC实体将第一窗口调整指示信息发送至第一设备的MAC实体，第一设备的MAC实体构建MAC CE，并通过MAC CE发送第一窗口调整指示信息。MAC CE的结构可以参考图6至图7，在此不再赘述。
步骤1204：第二设备根据第一窗口调整指示信息调整发送窗口的窗口长度。
第一设备通过MAC CE发送第一窗口调整指示信息时，第二设备将MAC CE中的目标逻辑信道字段指示的逻辑信道对应的发送窗口确定为需要调整的发送窗口。
第二设备发送的数据包和重传的数据包都不超出调整后的发送窗口的窗口长度的范围。
步骤1205：第一设备向第二设备发送状态报告。
步骤1206：第二设备根据所述状态报告，进行数据包重传。
具体的，所述第二设备若根据所述状态报告确定所述至少一个数据包中位于所述发送 窗口内的数据包接收失败，则重传接收失败的数据包。相应的，所述第二设备若根据所述状态报告确定所述至少一个数据包中位于所述发送窗口外的数据包接收失败，则暂时不重传这些数据包，而是标记接收失败且位于所述发送窗口外的数据包，并在确定标记的数据包位于滑动后的所述发送窗口内时，重传所述标记的数据包。
若第二定时器超时后，第一设备的接收缓冲区的空闲缓存的大小仍然小于第一阈值，第一设备在上次减少的发送窗口的窗口长度的基础上,再次减小第二设备的发送窗口的窗口长度。
具体的，步骤1207：第一设备向第二设备发送第二窗口调整指示信息，并启动第二定时器。
所述第二窗口调整指示信息用于指示所述第二设备将所述发送窗口的窗口长度调整为第二长度，所述第二长度小于所述第一长度。结合前面的描述，第一设备的RLC实体从第一窗口长度集合中确定出的第二长度为2 10。
步骤1208：第二设备根据第三窗口调整指示信息调整发送窗口的窗口长度。
若第二定时器超时后，第一设备的接收缓冲区的空闲缓存的大小大于第四阈值时，第一设备确定需要增加第二设备的发送窗口,从而可以在上次减少的发送窗口的窗口长度的基础上,增加第二设备的发送窗口的窗口长度。
需要说明的是，此时第一设备的接收缓冲区可以是指RLC层接收缓冲区，也可以是指PDCP层接收缓冲区。
具体的，步骤1209：第一设备向第二设备发送第三窗口调整指示信息，所述第二窗口调整指示信息用于指示所述第二设备将所述发送窗口的窗口长度调整为第三长度，所述第三长度大于所述第二长度。
结合前面的描述，第一设备的RLC实体从第二窗口长度集合中确定出的第三长度为2 11。
步骤1210：第二设备根据第三窗口调整指示信息调整发送窗口的窗口长度。
第二设备发送的数据包和重传的数据包都不超出调整后的发送窗口的窗口长度的范围。
以上结合附图详细说明了本申请实施例的通信方法，以下结合附图详细说明本申请实施例的通信装置。
图13是本申请实施例提供的一种终端的结构示意图。该终端可适用于图2所示出的流程图中，执行上述方法实施例中第一设备或第二设备的功能。为了便于说明，图13仅示出了终端的主要部件。如图13所示，终端130包括处理器、存储器、控制电路、天线以及输入输出装置。处理器主要用于对通信协议以及通信数据进行处理，以及对整个终端进行控制，执行软件程序，处理软件程序的数据，例如用于支持终端执行上述方法实施例中所描述的动作，如，生成第一窗口调整指示信息，向所述第二设备发送所述第一窗口调整指示信息等。存储器主要用于存储软件程序和数据，例如存储上述实施例中所描述的第一窗口调整指示信息等。控制电路主要用于基带信号与射频信号的转换以及对射频信号的处理。控制电路和天线一起也可以叫做收发器，主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。
当终端开机后，处理器可以读取存储单元中的软件程序，解释并执行软件程序的指令， 处理软件程序的数据。当需要通过无线发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。
本领域技术人员可以理解，为了便于说明，图13仅示出了一个存储器和一个处理器。在实际的终端中，可以存在多个处理器和多个存储器。存储器也可以称为存储介质或者存储设备等，本申请实施例对此不做限定。
作为一种可选的实现方式，处理器可以包括基带处理器和中央处理器，基带处理器主要用于对通信协议以及通信数据进行处理，中央处理器主要用于对整个终端进行控制，执行软件程序，处理软件程序的数据。图13中的处理器可以包括基带处理器和/或中央处理器的功能，本领域技术人员可以理解，基带处理器和中央处理器也可以是各自独立的处理器，通过总线等技术互联。本领域技术人员可以理解，终端可以包括一个或多个基带处理器以适应不同的网络制式，终端可以包括多个中央处理器以增强其处理能力，终端的各个部件可以通过各种总线连接。所述基带处理器也可以表述为基带处理电路或者基带处理芯片。所述中央处理器也可以表述为中央处理电路或者中央处理芯片。对通信协议以及通信数据进行处理的功能可以内置在处理器中，也可以以软件程序的形式存储在存储单元中，由处理器执行软件程序以实现基带处理功能。
在本申请实施例中，可以将具有收发功能的天线和控制电路视为终端130的收发单元1301，例如，用于支持终端执行如图2部分所述的接收功能和发送功能。将具有处理功能的处理器视为终端130的处理单元1302。如图13所示，终端130包括收发单元1301和处理单元1302。收发单元也可以称为收发器、收发机、收发装置等。可选的，可以将收发单元1301中用于实现接收功能的器件视为接收单元，将收发单元1301中用于实现发送功能的器件视为发送单元，即收发单元1301包括接收单元和发送单元，接收单元也可以称为接收机、输入口、接收电路等，发送单元可以称为发射机、发射器或者发射电路等。
处理单元1302可用于执行该存储器存储的指令，以控制收发单元1301接收信号和/或发送信号，完成上述方法实施例中终端的功能。作为一种实现方式，收发单元1301的功能可以考虑通过收发电路或者收发的专用芯片实现。
图14是本申请实施例提供的一种网络设备的结构示意图，如可以为基站的结构示意图。如图14所示，该基站可应用于如图2所示的流程中，执行上述方法实施例中第一设备或第二设备的功能。基站140可包括一个或多个射频单元，如远端射频单元(remote radio unit,RRU)1401和一个或多个基带单元(baseband unit，BBU)(也可称为数字单元，digital unit，DU)1402。所述RRU 1401可以称为收发单元、收发机、收发电路、或者收发器等等，其可以包括至少一个天线14011和射频单元14012。所述RRU 1401部分主要用于射频信号的收发以及射频信号与基带信号的转换，例如用于向终端发送上述实施例中所述的信令消息。所述BBU 1402部分主要用于进行基带处理，对基站进行控制等。所述RRU 1401与BBU 1402可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。
所述BBU 1402为基站的控制中心，也可以称为处理单元，主要用于完成基带处理功能，如信道编码，复用，调制，扩频等等。例如所述BBU(处理单元)1402可以用于控制基站执行上述方法实施例中关于接入网设备的操作流程。
在一个实例中，所述BBU 1402可以由一个或多个单板构成，多个单板可以共同支持单一接入指示的无线接入网(如LTE网)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其他网)。所述BBU 1402还包括存储器14021和处理器14022，所述存储器14021用于存储必要的指令和数据。例如存储器14021存储上述实施例中的码本索引与预编码矩阵的对应关系。所述处理器14022用于控制基站进行必要的动作，例如用于控制基站执行上述方法实施例中关于接入网设备的操作流程。所述存储器14021和处理器14022可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路
图15给出了一种通信装置1500的结构示意图。装置1500可用于实现上述方法实施例中描述的方法，可以参见上述方法实施例中的说明。所述通信装置1500可以是芯片，接入网设备(如基站)，终端或者其他接入网设备等。
所述通信装置1500包括一个或多个处理器1501。所述处理器1501可以是通用处理器和/或专用处理器等。例如可以是基带处理器、或中央处理器。基带处理器可以用于对通信协议以及通信数据进行处理，中央处理器可以用于对通信装置(如，基站、终端、或芯片等)进行控制，执行软件程序，处理软件程序的数据。所述通信装置可以包括收发单元，用以实现信号的输入(接收)和输出(发送)。例如，通信装置可以为芯片，所述收发单元可以是芯片的输入和/或输出电路，或者通信接口。所述芯片可以用于终端或基站或其他接入网设备。又如，通信装置可以为终端或基站或其他接入网设备，所述收发单元可以为收发器，射频芯片等。
所述通信装置1500包括一个或多个所述处理器1501，所述一个或多个处理器1501可实现图2所示的实施例中接入网设备或者终端的方法。
在一种可能的设计中，所述通信装置1500包括用于生成第一窗口调整指示信息的部件(means)，以及用于发送第一窗口调整指示信息的部件(means)。可以通过一个或多个处理器来实现所述生成第一窗口调整指示信息的means以及发送第一窗口调整指示信息的means的功能。例如可以通过一个或多个处理器生成所述第一窗口调整指示信息，通过收发器、或输入/输出电路、或芯片的接口发送所述第一窗口调整指示信息。所述第一窗口调整指示信息可以参见上述方法实施例中的相关描述。
在一种可能的设计中，所述通信装置1500包括用于接收第一窗口调整指示信息的部件(means)，以及用于确定第一窗口调整指示信息指示的资源的部件(means)。所述第一窗口调整指示信息以及如何确定第一窗口调整指示信息指示的资源可以参见上述方法实施例中的相关描述。例如可以通过收发器、或输入/输出电路、或芯片的接口接收所述第一窗口调整指示信息，通过一个或多个处理器确定第一窗口调整指示信息指示的资源。
可选的，处理器1501除了实现图2所示的实施例的方法，还可以实现其他功能。
可选的，一种设计中，处理器1501也可以包括指令1503，所述指令可以在所述处理器上被运行，使得所述通信装置1500执行上述方法实施例中描述的方法。
在又一种可能的设计中，通信装置1500也可以包括电路，所述电路可以实现前述方法实施例中接入网设备或终端的功能。
在又一种可能的设计中所述通信装置1500中可以包括一个或多个存储器1502，其上存有指令1504，所述指令可在所述处理器上被运行，使得所述通信装置1500执行上述方法实施例中描述的方法。可选的，所述存储器中还可以存储有数据。可选的处理器中也可 以存储指令和/或数据。例如，所述一个或多个存储器1502可以存储上述实施例中所描述的对应关系，或者上述实施例中所涉及的相关的参数或表格等。所述处理器和存储器可以单独设置，也可以集成在一起。
在又一种可能的设计中，所述通信装置1500还可以包括收发单元1505以及天线1506。所述处理器1501可以称为处理单元，对通信装置(终端或者基站)进行控制。所述收发单元1505可以称为收发机、收发电路、或者收发器等，用于通过天线1506实现通信装置的收发功能。
本申请还提供一种通信***，其包括前述的一个或多个第一设备，和，一个或多个第二设备。
本申请实施例还提供了一种计算机可读介质，其上存储有计算机程序，该计算机程序被计算机执行时实现上述任一方法实施例所述的方法。
本申请实施例还提供了一种计算机程序产品，该计算机程序产品被计算机执行时实现上述任一方法实施例所述的方法。
应理解，在本申请实施例中的处理器可以是中央处理单元(Central Processing Unit，CPU)，该处理器还可以是其他通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
还应理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的随机存取存储器(random access memory，RAM)可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。
上述实施例，可以全部或部分地通过软件、硬件(如电路)、固件或其他任意组合来实现。当使用软件实现时，上述实施例可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令或计算机程序。在计算机上加载或执行所述计算机指令或计算机程序时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以为通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集合的服务器、数据中心等数据存储设备。所述可用介质可 以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质。半导体介质可以是固态硬盘。
应理解，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，通常为“和/或”的简略形式。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的***、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。

Claims (20)

  1. 一种通信方法，其特征在于，该方法包括：
    第一设备接收第二设备发送的数据包，并在确定数据包处理能力达到所述第一设备的处理上限时，生成第一窗口调整指示信息；所述第一窗口调整指示信息用于指示所述第二设备减少发送窗口的窗口长度；所述发送窗口的窗口长度与所述第二设备一次最多调度的数据包的数量成正比；
    所述第一设备向所述第二设备发送所述第一窗口调整指示信息。
  2. 根据权利要求1所述的方法，其特征在于，所述确定数据包处理能力达到所述第一设备的处理上限，包括：
    所述第一设备确定满足以下一项或多项预设条件时，确定数据包处理能力达到所述第一设备的处理上限：
    所述第一设备的接收缓冲区的空闲缓存的大小小于第一阈值；
    所述第一设备的接收缓冲区的占用缓存的大小大于第二阈值；
    所述第一设备的接收缓冲区发生数据溢出；
    所述第一设备确定没有空闲的资源处理接收到的数据包。
  3. 根据权利要求1或2所述的方法，其特征在于，所述发送窗口调整前的窗口长度为M，M大于0；
    所述发送窗口调整后的窗口长度为第一长度；
    所述第一长度为α×M，或者，所述第一长度满足以下公式：
    P＝α×min((RX_Next_Highest-RX_Next+LAST_UPLOAD)，M)
    其中，P为所述第一长度，α为大于0且小于1的数，RX_Next_Highest为当前接收到的最大序列号SN的数据包的SN加1后的值，RX_Next为所述第一设备的接收窗口中第一个未接收全的数据包的SN，LAST_UPLOAD为所述第一设备在所述接收窗口上一次滑动时递交的数据包的数量，min()为取最小值运算。
  4. 根据权利要求3所述的方法，其特征在于，所述发送窗口的窗口长度为预设的K个长度中的一个，K为大于0的整数；
    所述第一长度为所述K个长度中小于所述发送窗口调整前的窗口长度的长度。
  5. 根据权利要求1至4任一所述的方法，其特征在于，所述第一窗口调整指示信息对应的逻辑信道或数据无线承载在所述第一设备中占用的缓存大于第三阈值；或者，所述第一窗口调整指示信息对应的逻辑信道或数据无线承载在所述第一设备中占有的缓存最大。
  6. 根据权利要求1至5任一所述的方法，其特征在于，所述第一设备生成第一窗口调整指示信息之前，所述方法还包括：
    所述第一设备确定第一定时器已经超时；
    所述第一定时器为所述第一设备上一次生成窗口调整指示信息时启动的，所述第一定时器的定时时长为第一时长。
  7. 根据权利要求3至6任一所述的方法，其特征在于，所述第一设备向所述第二设备发送所述第一窗口调整指示信息之后，所述方法还包括：
    所述第一设备向所述第二设备发送第二窗口调整指示信息；
    所述第二窗口调整指示信息用于指示所述第二设备将所述发送窗口的窗口长度调整为第二长度，所述第二长度大于所述第一长度，或者所述第二长度小于所述第一长度。
  8. 根据权利要求7所述的方法，其特征在于，所述第二长度大于所述第一长度时，所述第一设备向所述第二设备发送第二窗口调整指示信息之前，所述方法还包括：
    所述第一设备确定满足以下一项或多项预设条件：
    所述第一设备的接收缓冲区的空闲缓存的大小大于第四阈值；
    所述第一设备的接收缓冲区的占用缓存的大小小于第五阈值；
    所述第一设备接收的数据速率小于预设速率。
  9. 根据权利要求1至8任一所述的方法，其特征在于，所述第一设备在发送所述第一窗口调整指示信息时，若确定所述接收窗口对应的重排序定时器已经启动，则将所述重排序定时器状态变量的取值确定为所述接收窗口的滑动边界；所述滑动边界位于所述接收窗口内，且所述滑动边界与所述接收窗口的起始边界之间的长度为所述发送窗口的窗口长度。
  10. 根据权利要求1至9任一所述的方法，其特征在于，所述第一设备向所述第二设备发送所述第一窗口调整指示信息之后，所述方法还包括：
    所述第一设备在启动接收窗口对应的重排序定时器时，根据以下方式确定重排序定时器状态变量，所述重排序定时器状态变量为触发与所述接收窗口对应的重排序定时器启动的数据包的SN：
    若RX_Next_Highest位于所述接收窗口的滑动边界内，则将所述重排序定时器状态变量的取值确定为RX_Next_Highest，其中，RX_Next_Highest为当前接收到的最大序列号SN的数据包的SN加1后的值；所述滑动边界位于所述接收窗口内，且所述滑动边界与所述接收窗口的起始边界之间的长度为所述发送窗口的窗口长度；
    或者，若RX_Next_Highest位于所述接收窗口的滑动边界外，则将所述重排序定时器状态变量的取值确定为所述接收窗口的滑动边界。
  11. 根据权利要求1至10任一所述的方法，其特征在于，所述第一设备向所述第二设备发送所述第一窗口调整指示信息，包括：
    所述第一设备通过无线资源控制RRC信令向所述第二设备发送所述第一窗口调整指示信息；
    或者，所述第一设备通过无线链路控制RLC层控制消息向所述第二设备发送所述第一窗口调整指示信息；
    或者，所述第一设备通过媒体介入控制MAC控制元素CE向所述第二设备发送所述第一窗口调整指示信息。
  12. 一种通信方法，其特征在于，包括：
    第二设备接收第一设备发送的第一窗口调整指示信息；所述第一窗口调整指示信息用于指示所述第二设备减少发送窗口的窗口长度；所述发送窗口的窗口长度与所述第二设备一次最多调度的数据包的数量成正比；所述第一窗口调整指示信息为所述第一设备在确定数据包处理能力达到所述第一设备的处理上限时生成的；
    所述第二设备根据所述第一窗口调整指示信息调整所述发送窗口的窗口长度。
  13. 根据权利要求12所述的方法，其特征在于，所述发送窗口调整前的窗口长度为M，M大于0；
    所述发送窗口调整后的窗口长度为第一长度；
    所述第一长度为α×M，或者，所述第一长度满足以下公式：
    P＝α×min((RX_Next_Highest-RX_Next+LAST_UPLOAD)，M)
    其中，P为所述第一长度，α为大于0且小于1的数，RX_Next_Highest为当前接收到的最大序列号SN的数据包的SN加1后的值，RX_Next为所述第一设备的接收窗口中第一个未接收全的数据包的SN，LAST_UPLOAD为所述第一设备在所述接收窗口上一次滑动时递交的数据包的数量，min()为取最小值运算。
  14. 根据权利要求13所述的方法，其特征在于，所述发送窗口的窗口长度为预设的K个长度中的一个，K为大于0的整数；
    所述第一长度为所述K个长度中小于所述发送窗口调整前的窗口长度的最大长度。
  15. 根据权利要求12至14任一所述的方法，其特征在于，所述发送窗口对应的逻辑信道的数据信令承载在所述第一设备中占用的缓存大于第三阈值。
  16. 根据权利要求12至15任一所述的方法，其特征在于，所述第二设备根据所述第一窗口调整指示信息调整所述发送窗口的窗口长度之后，所述方法还包括：
    所述第二设备接收所述第一设备发送的状态报告，所述状态报告指示出所述第一设备从所述第二设备接收到的至少一个数据包中每个数据包是否接收成功；
    所述第二设备若根据所述状态报告确定所述至少一个数据包中位于所述发送窗口内的数据包接收失败，则重传接收失败的数据包；
    或者，所述第二设备若根据所述状态报告确定所述至少一个数据包中位于所述发送窗口外的数据包接收失败，则标记接收失败且位于所述发送窗口外的数据包，并在确定标记的数据包位于滑动后的所述发送窗口内时，重传所述标记的数据包。
  17. 根据权利要求12至16任一所述的方法，其特征在于，所述第二设备根据所述第一窗口调整指示信息调整所述发送窗口的窗口长度之后，所述方法还包括：
    所述第二设备接收所述第一设备发送的第二窗口调整指示信息；
    所述第二窗口调整指示信息用于指示所述第二设备将所述发送窗口的窗口长度调整为第二长度，所述第二长度大于所述第一长度，或者所述第二长度小于所述第一长度；
    所述第二设备根据所述第二窗口调整指示信息调整所述发送窗口的窗口长度。
  18. 一种通信装置，其特征在于，用于执行如权利要求1至17中任一项所述的方法。
  19. 一种通信装置，其特征在于，包括至少一个处理器，所述至少一个处理器与至少一个存储器耦合：
    所述至少一个处理器，用于执行所述至少一个存储器中存储的计算机程序或指令，以使得所述装置执行如权利要求1至17中任一项所述的方法。
  20. 一种可读存储介质，其特征在于，包括程序或指令，当所述程序或指令被执行时，如权利要求1至17中任意一项所述的方法被执行。
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