WO2023137854A1 - 重发超限及双无条件下rlc确认模式增强方法及装置 - Google Patents

重发超限及双无条件下rlc确认模式增强方法及装置 Download PDF

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WO2023137854A1
WO2023137854A1 PCT/CN2022/081582 CN2022081582W WO2023137854A1 WO 2023137854 A1 WO2023137854 A1 WO 2023137854A1 CN 2022081582 W CN2022081582 W CN 2022081582W WO 2023137854 A1 WO2023137854 A1 WO 2023137854A1
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message
sending
receiving end
retransmission
rlc
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PCT/CN2022/081582
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English (en)
French (fr)
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沈庆国
林杨
韩小芳
邱睿奇
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网络通信与安全紫金山实验室
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Publication of WO2023137854A1 publication Critical patent/WO2023137854A1/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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1848—Time-out mechanisms
    • H04L1/1851—Time-out mechanisms using multiple timers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/188—Time-out mechanisms
    • H04L1/1883—Time-out mechanisms using multiple timers
    • 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
    • H04L47/29—Flow control; Congestion control using a combination of thresholds
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present application relates to the technical field of wireless communication, and in particular to a method and device for enhancing the RLC acknowledgment mode under retransmission exceeding limit and dual unconditional conditions.
  • the base station gNB gNodeB
  • the terminal UE User Equipment
  • the data packets received by the base station and the core network first pass through the packet data convergence protocol layer PDCP (Packet Data Convegence Protocol), after the IP (Internet Protocol) packet header is compressed and encrypted, and then transmitted to the radio link control layer RLC (Radio Link Control), segmented and concatenated according to the transmission requirements of the media access control layer MAC (Media Access Control), and then transmitted to the MAC layer, and finally form a wireless signal transmission from the air interface.
  • PDCP Packet Data Convegence Protocol
  • RLC Radio Link Control
  • MAC Media Access Control
  • the RLC protocol follows the 5G standard ts38.322 or 4G standard ts36.322, and provides transmission service modes such as direct mode TM (Transparent Mode), unacknowledged mode UM (Unacknowledge Mode), and acknowledged mode AM (Acknowledge Mode).
  • the RLC AM mode is a connection-oriented service mode, which can realize automatic repeat request ARQ (Automatic Repeat reQuest) error correction, duplicate packet detection, segmentation/reassembly and RLC SDU discard processing functions, etc., and the hybrid automatic repeat request HARQ (Hybrid Automatic Repeat reQuest) provided by the MAC layer cooperates to realize a more reliable transmission service.
  • ARQ Automatic Repeat reQuest
  • HARQ Hybrid Automatic Repeat reQuest
  • the retransmission overrun processing method and the polling processing method of the wireless link control layer in the confirmation mode are respectively: 1) Any message PDU (Protocol Data Unit) exceeding the maximum number of retransmissions must disconnect the RLC or even all air interface protocols of the corresponding terminal. When only a few PDUs exceed the maximum number of retransmissions, but its adjacent PDUs have been received correctly, it can be judged that the communication quality of the wireless link is good.
  • PDU Protocol Data Unit
  • the existing standard practice is to report to the radio resource control layer RRC (Radio Resource Control), and the RRC will disconnect and re-establish all air interface protocol connections of the corresponding terminal, so that all service flows on the UM and AM modes of the terminal will be seriously affected; If there is no data to send in the buffer, or a new message cannot be sent due to reasons such as no space in the sending window (referred to as "double unconditional"), the existing standard specification method is to select the PDU with the largest message sequence number in the sent message set. However, the message may be located above the highest_status of the receiver, and the status report cannot be triggered in time, resulting in delayed retransmission of the message that has not received a positive confirmation.
  • RRC Radio Resource Control
  • This application provides a method and device for enhancing the RLC confirmation mode under retransmission limit and dual unconditional conditions. It is used to solve the problem that when individual messages exceed the maximum number of retransmissions, immediately disconnect the RLC or even all the air interface protocols of the corresponding terminal have too much influence, and under dual unconditional conditions.
  • t-PollRetransmit expires, when the message with the largest message sequence number SN (Sequence Number) is selected for retransmission to carry Polling, the status report cannot be triggered in time, resulting in delayed retransmission of messages that have not received positive confirmation, effectively improving the terminal. Communication speed and reliability, and triggering the receiving end to send status messages as soon as possible to avoid side effects.
  • This application provides a method for enhancing the RLC acknowledgment mode under retransmission exceeding the limit and double unconditional, which is applied to the sending end, including:
  • the first message is an RLC/AM data message
  • the short message is a special RLC/AM data message with a data field length of 0, and the short message sequence number is the first message sequence number
  • the second message with the smallest message sequence number is sent to the receiving end in the message set that has not received the positive confirmation of the receiving end; wherein, the double unconditional conditions are that the sending buffer and the retransmission buffer have no data to send at the current moment, and a new message cannot be sent because there is no vacancy in the sending window.
  • the status message includes a negative acknowledgment for the first message and positive acknowledgments for other messages.
  • recombining the first message into a short message and sending it to the receiving end including:
  • the second message with the smallest message sequence number is sent to the receiving end in the set of messages that have not received the positive confirmation of the receiving end, including:
  • This application also provides a method for enhancing the RLC confirmation mode under retransmission exceeding the limit and double unconditional, which is applied to the receiving end, including:
  • the status message including a negative acknowledgment of the unreceived first message and positive acknowledgments of other messages
  • the short message is a special RLC/AM data message with a data field length of 0, and the short message sequence number is the first message sequence number.
  • the second message is the message with the smallest sequence number selected by the sending end from the set of messages that have not received a positive acknowledgment.
  • the present application also provides a sending end applied to a base station or a terminal, including:
  • the first processing module is configured to recombine the first message into a short message and send it to the receiving end when the number of times of retransmission of the first message not received by the receiving end reaches a preset threshold; wherein, the first message is an RLC/AM data message, the short message is a special RLC/AM data message with a data field length of 0, and the short message sequence number is the first message sequence number;
  • the second processing module is used to send the second message with the smallest message sequence number to the receiving end in the message set that has not received the positive confirmation of the receiving end when the polling timer expires and satisfies the double unconditional conditions; wherein, the double unconditional conditions are that there is no data to send in the sending buffer and the retransmission buffer at the current moment, and a new message cannot be sent because there is no space in the sending window.
  • the first processing module before retransmitting the first message not received by the receiving end, is further specifically configured to:
  • the status message includes a negative acknowledgment for the first message and a positive acknowledgment for other messages.
  • the present application also provides a receiving end applied to a base station or a terminal, including:
  • a third processing module configured to send a status message to the sender, where the status message includes a negative acknowledgment of the unreceived first message and positive acknowledgments of other messages;
  • the fourth processing module is used to receive the short message sent by the sending end, update the receiving window state variable according to the short message, and feed back a status report to the sending end;
  • the fifth processing module is configured to receive the second message carrying the Polling bit sent by the sending end, and trigger an operation of sending a status message to the sending end according to the second message.
  • the present application also provides a sender device, including a memory, a processor, and a computer program stored on the memory and operable on the processor.
  • a sender device including a memory, a processor, and a computer program stored on the memory and operable on the processor.
  • the processor executes the computer program, it implements the steps of the method for enhancing the retransmission overrun and double unconditional RLC mode applied to the sender as described above.
  • the present application also provides a receiving end device, including a memory, a processor, and a computer program stored on the memory and operable on the processor.
  • a processor executes the computer program, it implements the steps of the method for enhancing retransmission exceeding the limit and double unconditional RLC acknowledgment mode applied to the receiving end as described above.
  • the present application also provides a processor-readable storage medium, the processor-readable storage medium stores a computer program, and the computer program is used to enable the processor to execute the method for enhancing the RLC acknowledgment mode under the retransmission limit and double unconditional conditions applied to the sending end as described above, or the steps of the method for enhancing the RLC acknowledgment mode under the retransmission limit and double unconditional conditions applied to the receiving end.
  • the method and device for enhancing the RLC confirmation mode under the retransmission limit and double unconditional conditions provided by the application when the number of times of the first message not received by the retransmission receiving end reaches the preset threshold value, the first message is recombined into a short message and sent to the receiving end; In the set of messages positively confirmed by the receiving end, the second message with the smallest message sequence number is sent to the receiving end; wherein, the double unconditional condition is that the sending buffer and the retransmission buffer have no data to send at the current moment, and a new message cannot be sent because there is no space in the sending window.
  • the present application can quickly push the sending and receiving windows to slide forward by reorganizing the retransmission exceeding the limit message into a short message and send it to the receiving end, so as to avoid reporting to RRC too early for air interface protocol reconnection;
  • the AM mode of the RLC can avoid connection re-establishment when individual message retransmissions exceed the limit, reduce the protocol pause time under double unconditional conditions, and thus achieve the purpose of enhancing system performance.
  • This application can maintain compatibility with the existing fifth generation new wireless system 5G NR (5th generation New Radio) standard, and cooperate with PDCP, RRC and other layer protocols to effectively improve user service quality and enhance system performance.
  • 5G NR 5th generation New Radio
  • FIG. 1 is one of the schematic flow diagrams of the communication method applied to the radio link control layer of the sending end in the confirmation mode provided by the present application;
  • FIG. 2 is the second schematic flow diagram of the communication method applied to the radio link control layer of the sending end in the confirmation mode provided by the present application;
  • FIG. 3 is the third schematic flow diagram of the communication method applied to the radio link control layer of the sending end in the confirmation mode provided by the present application;
  • Fig. 4 is a schematic diagram of the overall structure of the protocol stack provided by the present application.
  • Fig. 5 is one of the schematic diagrams of the short message format provided by the present application.
  • Fig. 6 is the second schematic diagram of the short message format provided by the present application.
  • FIG. 7 is the fourth schematic flow diagram of the communication method applied to the radio link control layer of the sending end in the confirmation mode provided by the present application;
  • Fig. 8 is a schematic flow chart of a communication method applied to a radio link control layer at a receiving end in an acknowledgment mode provided by the present application;
  • FIG. 9 is a schematic structural diagram of a sending device provided by the present application.
  • FIG. 10 is a schematic structural diagram of a receiver device provided by the present application.
  • FIG. 11 is a schematic structural diagram of a sending end device provided by the present application.
  • Fig. 12 is a schematic structural diagram of a receiver device provided by the present application.
  • the base station gNB gNodeB
  • the terminal UE User Equipment
  • the data packets received by the base station and the core network first pass through the packet data convergence protocol layer PDCP (Packet Data Convegence Protocol), after performing IP (Internet Protocol) header compression and encryption, they are transmitted to the radio link control layer RLC (Radio Link Control), segmented and concatenated according to the transmission requirements of the media access control layer MAC (Media Access Control), and then transmitted to the MAC layer, and finally form a wireless signal transmission from the air interface.
  • PDCP Packet Data Convegence Protocol
  • IP Internet Protocol
  • RLC Radio Link Control
  • MAC Media Access Control
  • the RLC protocol follows the 5G standard ts38.322 or 4G standard ts36.322, and provides transmission service modes such as direct mode TM (Transparent Mode), unacknowledged mode UM (Unacknowledge Mode), and acknowledged mode AM (Acknowledge Mode).
  • the RLC AM mode is a connection-oriented service mode, which can realize automatic repeat request ARQ (Automatic Repeat reQuest) error correction, duplicate packet detection, segmentation/reassembly and RLC SDU discard processing functions, etc., and the hybrid automatic repeat request HARQ (Hybrid Automatic Repeat reQuest) provided by the MAC layer cooperates to realize a more reliable transmission service.
  • ARQ Automatic Repeat reQuest
  • HARQ Hybrid Automatic Repeat reQuest
  • the applicable system may be global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) general packet radio service (general packet radio service, GPRS) system, long term evolution (long term evolution) , LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, long term evolution advanced (LTE-A) system, universal mobile telecommunications system (UMTS), global interconnection microwave access (worldwide interoperability) for microwave access, WiMAX) system, 5G new air interface (New Radio, NR) system, etc.
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS general packet radio service
  • long term evolution long term evolution
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD LTE time division duplex
  • LTE-A long term evolution advanced
  • UMTS universal mobile telecommunications system
  • UMTS universal mobile
  • the terminal device involved in this application may be a device that provides voice and/or data connectivity to users, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem.
  • the name of the terminal equipment may be different.
  • the terminal equipment may be called User Equipment (User Equipment, UE).
  • Wireless terminal equipment can communicate with one or more core networks (Core Network, CN) via a radio access network (Radio Access Network, RAN).
  • the wireless terminal equipment can be mobile terminal equipment, such as mobile phones (or called "cellular" phones) and computers with mobile terminal equipment.
  • the wireless terminal device may also be called a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, a remote terminal, an access terminal, a user terminal, a user agent, a user
  • the device (user device) is not limited in this embodiment of the application. Since the terminal device and other network devices (such as core network devices and access network devices (ie, base stations)) together constitute a communication-capable network, in this application, the terminal device is also regarded as a kind of network device.
  • the network device involved in the embodiment of the present application may be a base station, and the base station may include multiple cells providing services for the terminal, or may be a CU (Central Unit, centralized control unit) or a DU (Distributed Unit, distributed unit).
  • the network device can also be called an access point, or it can be a device in the access network that communicates with the wireless terminal device through one or more sectors on the air interface, or other names.
  • the network device may be operable to interchange received over-the-air frames with Internet Protocol (IP) packets and act as a router between the wireless end device and the rest of the access network, which may include an Internet Protocol (IP) communications network.
  • IP Internet Protocol
  • Network devices may also coordinate attribute management for the air interface.
  • the network device involved in the embodiment of the present application may be a network device (Base Transceiver Station, BTS) in Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), or a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), It can also be an evolved network device (evolutional Node B, eNB or e-NodeB) in a long term evolution (LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), or a home evolved base station (Home evolved Node B, HeNB), a relay node (relay node), a home base station (femto), a pico base station (pico) etc., are not limited in the embodiments of the present application.
  • a network device may include a centralized unit (centralized unit, CU) node and a distributed unit (distributed unit, DU) node, and the centralized unit and the distributed unit may also be
  • both the base station and the terminal can be used as both the sending end and the receiving end.
  • the base station is used as the sending end and the terminal is used as the receiving end for illustration.
  • the method for enhancing the RLC acknowledgment mode applied to the sender when the retransmission exceeds the limit and double unconditional is provided by this application, including:
  • Step 101 When the number of times of retransmission of the first message not received by the receiving end reaches the preset threshold, recombining the first message into a short message and sending it to the receiving end; wherein, the first message is an RLC/AM data message, and the short message is a special RLC/AM data message with a data field length of 0, and the short message sequence number is the first message sequence number;
  • the base station first receives the status message sent by the terminal before retransmitting the first message not received by the terminal.
  • the status message includes the negative acknowledgment bit NACK information of the SN message or its segment that the terminal has not received completely and the explicit or implicit positive acknowledgment bit ACK information of other messages, and the sequence number of the short message is the same as the sequence number of the first message.
  • the base station After the base station receives the status message sent by the terminal, it finds the ACK of sn-1, sn+1, ..., sn+i and other messages, and starts the terminal to send the link available status timer TxLinkTimer (this timer is newly set by this application, and the timer needs to be restarted whenever the status message contains a new confirmed SN explicitly or implicitly), and the timer will expire after the predefined time TxLinkLive; if the message with the serial number sn or its segment needs to be retransmitted, the number of retransmissions + 1, and then If it is found that the retransmission has exceeded the maximum number of times and the timer TxLinkTimer is valid, a short message is constructed and sent to the terminal.
  • Step 102 When the polling timer expires and the double unconditional condition is met, send the second message with the smallest message sequence number to the receiving end in the message set that has not received the positive confirmation from the receiving end; wherein, the double unconditional condition is that there is no data to send in the sending buffer and the retransmission buffer at the current moment, and a new message cannot be sent because there is no space in the sending window.
  • the base station sets the Polling flag in the currently sent AM PDU when the conditions in section 5.3.3.2 of the standard ts38.322 are met, and the SN of the current PDU is stored as SNp, and the timer t-PollRetransmit is started at this time. If t-PollRetransmit expires and meets the double unconditional conditions, among the messages that have not received positive confirmation, the message with the smallest SN and the maximum number of retransmissions is preferentially selected for retransmission, and carries the Polling bit, as shown in Figure 7.
  • the specific processing process is: After a certain period of time, the timer t-PollRetransmit expires (indicating that the status message containing the ACK of SNp has not been received), and the double unconditional conditions are satisfied, the sending AM entity preferentially selects the message with the smallest sequence number that has not received positive confirmation from the current sending window and The SN message that has not reached the maximum number of retransmissions (if all messages that have not received confirmation have reached the maximum number of retransmissions, then select the message with the smallest SN); after the SN message that needs to be resent is selected, the Polling flag bit is inserted in the message, and it is sent by the RLC AM entity; wherein, if the status message that includes the SNp is received before the t-PollRetransmit timer expires, the t-PollRetransmit timer is stopped and reset.
  • the scheme is to find a PDU that has been sent to the terminal with the largest SN to retransmit and set Polling, or to randomly find a PDU corresponding to an SN that has not received a positive confirmation to retransmit and set Polling.
  • the retransmission overrun and double-unconditional RLC confirmation mode enhancement method provided by the present application, when the number of times of retransmission of the first message not received by the receiving end reaches the preset threshold, recombine the first message into a short message and send it to the receiving end; wherein, the first message is an RLC/AM data message, the short message is a special RLC/AM data message with a data field length of 0, and the short message sequence number is the first message sequence number; In the set of positively confirmed messages, the second message with the smallest message sequence number is sent to the receiving end; wherein, the two unconditional conditions are that the sending buffer and the retransmitting buffer have no data to send at the moment, and a new message cannot be sent because there is no space in the sending window.
  • the present application can quickly push the sending and receiving windows to slide forward by reorganizing the retransmission exceeding the limit message into a short message and send it to the receiving end, so as to avoid reporting to RRC too early for air interface protocol reconnection;
  • the AM mode of the RLC can avoid connection re-establishment when individual message retransmissions exceed the limit, reduce the protocol pause time under double unconditional conditions, and thus achieve the purpose of enhancing system performance.
  • This application can maintain compatibility with the existing fifth generation new wireless system 5G NR (5th generation New Radio) standard, and cooperate with PDCP, RRC and other layer protocols to effectively improve user service quality and enhance system performance.
  • 5G NR 5th generation New Radio
  • the status message includes a negative acknowledgment for the first message and positive acknowledgments for other messages.
  • the sending end restarts the sending link available state timer.
  • the short message is resent.
  • the second message with the smallest message sequence number is sent to the receiving end in the set of messages that have not received affirmative confirmation from the receiving end, including:
  • the individual message exceeds the maximum number of retransmissions, which means that the sending end has other messages sent successfully (received confirmation response) within a predefined time, and these messages do not exceed the maximum number of retransmissions;
  • the short message is a PDU of RLC AM mode, its data length is set to 0, and its sequence number SN is the sequence number of that PDU exceeding the maximum number of retransmissions; It refers to updating the RX_Next state variable, and at the same time, according to the SN sequence number of the current short message, update the state variables such as RX_Highest_Status, RX_Next_Highest, and RX_Next_Status_Trigger as needed; avoiding reporting the RRC too early for air interface protocol reconnection refers to not reporting this event to RRC when the maximum number of retransmissions is reached, thereby triggering the air interface protocol reconnection, but continuing to resend the short message to reach the predefined follow-up times before reporting to RRC for
  • the present application discloses a radio link control protocol RLC method for reducing connection re-establishment and polling-triggered retransmission messages in the confirmation mode AM, which involves wireless communication networks such as 5G and 4G, and can solve problems such as unnecessary connection re-establishment or long protocol pause time in some cases.
  • This application includes: when only a few messages exceed the maximum number of retransmissions, use the method of sending a short message containing the serial number SN of the message to promote the rapid sliding of the sending and receiving window, and avoid reporting to RRC too early for air interface protocol reconnection; Carry the Polling bit.
  • This application is applicable to data transmission between 5G, 4G and other base stations and terminals, and can effectively enhance the communication performance of the radio link control layer RLC in the acknowledgment mode AM.
  • the base station gNB in the RLC AM mode, sends the data packet of the PDCP layer to the AM entity of the RLC layer according to the service characteristics to form the data to be sent by the RLC AM entity.
  • the MAC layer of the gNB sending end obtains data to be sent from entities such as the RLC layer AM as needed, and assembles one or more RLC PDUs into a MAC PDU.
  • the RLC AM PDU formed by the data to be sent by the RLC AM entity includes fields such as SN, P, SI, SO and data.
  • the physical layer of the gNB transmitter sends the MAC PDU from the air interface to the UE receiver.
  • the physical layer of the UE receiving end receives the message sent from the air interface, and uploads it to the MAC layer after successful decoding.
  • the MAC unpacks the received message, obtains the AM PDU message and uploads it to the AM entity of the RLC.
  • the SN numbers contained in each AM PDU message completely received within a certain period of time are sn-1, sn+1, ..., sn+i, and sn+i is located in the receiving window, but the SN message is not completely accepted.
  • the RLC AM receiving end constructs a corresponding status message and sends it to the RLC AM sending end on the base station side.
  • the status message includes the NACK information of the SN message or its segment and the explicit or implicit ACK information of other messages.
  • gNB receives the status message, finds the ACK of sn-1, sn+1,..., sn+i and other messages, starts the terminal to send the link availability timer TxLinkTimer, and the timer will expire after the predefined time TxLinkLive; finds that the message with the sequence number sn or its segment needs to be retransmitted, after adding 1 to the number of retransmissions, and finds that the retransmission has exceeded the maximum number and the timer TxLinkTimer is valid, it constructs a short message and sends it to the receiver.
  • the method for enhancing the RLC acknowledgment mode applied to the receiving end for retransmission exceeding the limit and double unconditional provided by this application includes:
  • Step 201 Sending a status message to the sender, the status message including a negative acknowledgment of the unreceived first message and positive acknowledgments of other messages;
  • the physical layer of the UE receiving end receives the message sent from the air interface, and uploads it to the MAC layer after successful decoding, and the MAC unpacks the received message to obtain the AM PDU message and upload it to the AM entity of the RLC.
  • the SN numbers contained in each AM PDU message completely received within a certain period of time are sn-1, sn+1, ..., sn+i, and sn+i is located in the receiving window, but the SN message is not completely accepted.
  • the RLC AM receiving end constructs a corresponding status message and sends it to the RLC AM sending end on the base station side.
  • the status message includes the NACK information of the sn message or its segment and the explicit or implicit ACK information of other messages.
  • Step 202 Receive the short message sent by the sending end, update the receiving window state variable according to the short message, and feed back a status report to the sending end;
  • the UE receiving side receives the short message sent by the base station side, and after parsing the corresponding message header, finds that the data length part is 0, then it is considered to be a short message, and according to other information such as the SN number obtained by parsing the message header information, clears the original SN corresponding segment (if any) in its cache, and then updates the relevant state variables of the receiving window, and triggers a status report as needed. Since the data part is empty, the receiver of the RLC AM entity does not submit any data message to the upper layer. Correspondingly, the sender of the base station waits for the status report containing the ACK of the SN. If the short message is not received on time, it will continue to resend the short message.
  • Step 203 Receive the second message carrying the Polling bit sent by the sending end, and trigger the operation of sending a status message to the sending end according to the second message.
  • the terminal receives the message carrying the Polling bit sent by the base station, and triggers a normal process of sending a status message to the base station according to the message.
  • the short message is a special RLC/AM data message with a data field length of 0, and the short message sequence number is the first message sequence number.
  • the second message is the message with the smallest sequence number selected by the sending end from the set of messages that have not received positive confirmation.
  • FIG. 9 it is a schematic structural diagram of a device applied to a base station or a terminal in this application, and the device includes:
  • the first processing module 1 is used to recombine the first message into a short message and send it to the receiving end when the number of times of retransmission of the first message not received by the receiving end reaches a preset threshold; wherein, the first message is an RLC/AM data message, and the short message is a special RLC/AM data message with a data field length of 0, and the short message sequence number is the first message sequence number;
  • the second processing module 2 is used to send the second message with the smallest message sequence number to the receiving end in the message set that has not received the positive confirmation of the receiving end when the polling timer expires and satisfies the double unconditional conditions; wherein, the double unconditional conditions are that there is no data to send in the sending buffer and the retransmission buffer at the current moment, and a new message cannot be sent because there is no space in the sending window.
  • the first processing module before retransmitting the first message not received by the receiving end, is further specifically configured to:
  • the status message includes a negative acknowledgment for the first message and a positive acknowledgment for other messages.
  • this device can implement all the method steps of the embodiment of the RLC acknowledgment mode enhancement method applied to the base station or the transmitting end of the base station or terminal under the retransmission exceeding the limit and double unconditional conditions and can achieve the same technical effect, and will not repeat them here.
  • FIG. 10 it is a schematic structural diagram of a receiving end device applied to a base station or a terminal in this application, and the device includes:
  • the third processing module 3 is configured to send a status message to the sender, where the status message includes a negative acknowledgment of the unreceived first message and a positive acknowledgment of other messages;
  • the fourth processing module 4 is used to receive the short message sent by the sending end, and update the receiving window state variable according to the short message and feed back a status report to the sending end;
  • the fifth processing module 5 is configured to receive the second message carrying the Polling bit sent by the sending end, and trigger an operation of sending a status message to the sending end according to the second message.
  • this device can implement all the method steps of the embodiment of the RLC acknowledgment mode enhancement method applied to the receiving end under the retransmission limit and double unconditional conditions, and can achieve the same technical effect, and will not be repeated here.
  • FIG. 11 is one of the structural schematic diagrams of the sending end device provided in this application, including a memory 1120 , a transceiver 1100 , and a processor 1110 .
  • the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 1110 and various circuits of the memory represented by the memory 1120 are linked together.
  • the bus architecture can also link together various other circuits such as peripherals, voltage regulators, and power management circuits, etc., which are well known in the art and therefore will not be further described herein.
  • the bus interface provides the interface.
  • the transceiver 1100 may be a plurality of elements, including a transmitter and a receiver, providing a unit for communicating with various other devices over transmission media, including wireless channels, wired channels, optical cables, and other transmission media.
  • the processor 1110 is responsible for managing the bus architecture and general processing, and the memory 1120 can store data used by the processor 1110 when performing operations.
  • the processor 1110 may be a central processor (CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device, CPLD), and the processor may also adopt a multi-core architecture.
  • CPU central processor
  • ASIC Application Specific Integrated Circuit
  • FPGA field programmable gate array
  • CPLD Complex Programmable Logic Device
  • the memory 1120 is used to store computer programs; the transceiver 1100 is used to send and receive data under the control of the processor; the processor 1110 is used to read the computer programs in the memory and perform the following operations:
  • the first message is an RLC/AM data message
  • the short message is a special RLC/AM data message with a data field length of 0, and the short message sequence number is the first message sequence number
  • the second message with the smallest message sequence number is sent to the receiving end in the message set that has not received the positive confirmation of the receiving end; wherein, the double unconditional conditions are that the sending buffer and the retransmission buffer have no data to send at the current moment, and a new message cannot be sent because there is no vacancy in the sending window.
  • the sending end device provided by this application can realize all the method steps applied to the embodiment of the method for enhancing the RLC acknowledgment mode under the condition of overrun and double unconditional applied to the sending end device, and can achieve the same technical effect, and will not repeat them here.
  • FIG. 12 is one of the structural schematic diagrams of the sending end device provided by the present application, including a memory 1220 , a transceiver 1200 , and a processor 1210 .
  • the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 1210 and various circuits of the memory represented by the memory 1220 are linked together.
  • the bus architecture can also link together various other circuits such as peripherals, voltage regulators, and power management circuits, etc., which are well known in the art and therefore will not be further described herein.
  • the bus interface provides the interface.
  • the transceiver 1200 may be a plurality of elements, including a transmitter and a receiver, providing a unit for communicating with various other devices over transmission media, including wireless channels, wired channels, optical cables, and other transmission media.
  • the processor 1210 is responsible for managing the bus architecture and general processing, and the memory 1220 can store data used by the processor 1210 when performing operations.
  • the processor 1210 may be a central processor (CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device, CPLD), and the processor may also adopt a multi-core architecture.
  • CPU central processor
  • ASIC Application Specific Integrated Circuit
  • FPGA field programmable gate array
  • CPLD Complex Programmable Logic Device
  • the memory 1220 is used to store computer programs; the transceiver 1200 is used to send and receive data under the control of the processor; the processor 1210 is used to read the computer programs in the memory and perform the following operations:
  • the status message including a negative acknowledgment of the unreceived first message and positive acknowledgments of other messages
  • the receiving end device provided by the present application can implement all the method steps applied to the embodiment of the RLC acknowledgment mode enhancement method applied to the receiving end device when the retransmission exceeds the limit and double unconditional, and can achieve the same technical effect, so it will not be repeated here.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.
  • the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a processor-readable storage medium.
  • the computer software product is stored in a storage medium and includes several instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (processor) execute all or part of the steps of the method described in each embodiment of the application.
  • the aforementioned storage medium includes: various media that can store program codes such as U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk.
  • the present application also provides a processor-readable storage medium, where a computer program is stored in the processor-readable storage medium, and the computer program is configured to cause the processor to execute the method described in the above-mentioned embodiments.
  • the processor-readable storage medium may be any available medium or data storage device that the processor can access, including but not limited to magnetic storage (such as floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (such as CD, DVD, BD, HVD, etc.), and semiconductor storage (such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)) and the like.
  • magnetic storage such as floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.
  • optical storage such as CD, DVD, BD, HVD, etc.
  • semiconductor storage such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)
  • a computer program is stored in a processor-readable storage medium, and the computer program is used to enable the processor to execute the steps of the method for enhancing the RLC acknowledgment mode in double-unconditional and retransmission exceeding limits.
  • the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) having computer-usable program code embodied therein.
  • processor-executable instructions may also be stored in a processor-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, such that the instructions stored in the processor-readable memory produce an article of manufacture comprising instruction means that implement the functions specified in one or more flows of the flowchart and/or one or more blocks of the block diagram.
  • processor-executable instructions can also be loaded on a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate computer-implemented processing, so that the instructions executed on the computer or other programmable device provide steps for realizing the functions specified in one or more processes of the flow chart and/or one or more blocks of the block diagram.

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Abstract

本申请提供一种重发超限及双无条件下RLC确认模式增强方法及装置。所述方法包括：当重传接收端未接收的第一报文次数达到预设阀值时，将所述第一报文重组成短报文发送至接收端；当轮询定时器超期且满足双无条件时，在未收到接收端肯定确认的报文集合中将报文序号最小的第二报文发送至接收端；其中，所述双无条件为发送缓冲区和重发缓冲区当前时刻无数据可发送，以及因发送窗口无空位无法发新报文。本申请适用于基站和终端间的数据传输，在报文达到最大重发次数或轮询定时器超期需挑选重发报文等情况下，避免连接重建或减少协议停顿时间，有效提高基站和终端间的数据传输性能。

Description

重发超限及双无条件下RLC确认模式增强方法及装置
相关申请的交叉引用
本申请要求于2022年1月19日提交的申请号为202210061200.2，名称为“重发超限及双无条件下RLC确认模式增强方法及装置”的中国专利申请的优先权，其通过引用方式全部并入本文。
技术领域
本申请涉及无线通信技术领域，尤其涉及一种重发超限及双无条件下RLC确认模式增强方法及装置。
背景技术
在第五代新无线系统/第四代无线系统5G/4G(5th generation/4th generation)无线网络中，基站gNB(gNodeB)和终端UE(User Equipment)间通过空口协议进行通信。基站和核心网接收过来的数据包首先经过分组数据汇聚协议层PDCP(Packet Data Convegence Protocol)，在进行IP(Internet Protocol)包头压缩和加密后，传输至无线链路控制层RLC(Radio Link Control)，按照媒体接入控制层MAC(Media Access Control)的传输需求进行分段和串接后，再传输至MAC层，最终从空中接口形成无线信号发送。其中，RLC协议遵循5G标准ts38.322或4G标准ts36.322，提供直通模式TM(Transparent Mode)、非确认模式UM(Unacknowledge Mode)、确认模式AM(Acknowledge Mode)等传输服务模式。RLC AM模式是面向连接的服务模式，可实现自动重传请求ARQ(Automatic Repeat reQuest)纠错、重复包检测、分段/重组和RLC SDU丢弃处理等功能，和MAC层提供的混合自动重传请求HARQ(Hybrid Automatic Repeat reQuest)协同实现了一种更可靠的传输服务。
现有技术中，无线链路控制层在确认模式下的重传超限处理方法和轮询Polling处理方法分别为：1)任何报文PDU(Protocol Data Unit)超过最大重发次数一定要断开RLC甚至对应终端所有空口协议。当只有个别PDU超最大重发次数，但其邻近的PDU已正确接收时，可以判断无线链路通信质量是 较好的，而现有标准规范做法是向无线资源控制层RRC(Radio Resource Control)报告，由RRC断开并重建对应终端所有空口协议连接，使得该终端UM、AM模式上的所有业务流都受到严重影响；2)当轮询定时器t-PollRetransmit超期后需发轮询Polling时，若基站处于发送缓冲区和重发缓冲区无数据可发，或因发送窗口无空位等原因无法发送新报文等条件下(简称“双无条件”)，现有标准规范做法是选择已发送的报文集合中报文序号最大的PDU，然而该报文可能位于收方highest_status之上，而不能及时触发status报告，导致未收到肯定确认的报文延迟重发。
发明内容
本申请提供一种重发超限及双无条件下RLC确认模式增强方法及装置，用以解决当个别报文超最大重发次数就立即断开RLC甚至对应终端所有空口协议影响过大，以及在双无条件下，当t-PollRetransmit超期时，挑选最大报文序号SN(Sequence Number)的报文进行重发以携带Polling时，不能及时触发status报告，导致未收到肯定确认的报文延迟重发的问题，有效提高终端通信速率和可靠性，以及尽快触发接收端发送status报文避免带来副作用。
本申请提供一种重发超限及双无条件下RLC确认模式增强方法，应用于发送端，包括：
当重传接收端未接收的第一报文次数达到预设阀值时，将所述第一报文重组成短报文发送至所述接收端；其中，所述第一报文为RLC/AM数据报文，短报文为数据字段长度为0的特殊RLC/AM数据报文，且所述短报文序号为所述第一报文序号；
当轮询定时器超期且满足双无条件时，在未收到所述接收端肯定确认的报文集合中将报文序号最小的第二报文发送至所述接收端；其中，所述双无条件为发送缓冲区和重发缓冲区当前时刻无数据可发送，以及因发送窗口无空位无法发新报文。
在一个实施例中，在所述重传接收端未接收的第一报文前，还包括：
接收所述接收端发送的状态报文，并启动所述发送端发送链路可用状态定时器；其中，所述状态报文包括对所述第一报文的否定确认，以及其他报文的肯定确认。
在一个实施例中，所述当重传接收端未接收的第一报文次数达到预设阀 值时，将所述第一报文重组成短报文发送至所述接收端，包括：
当重传接收端未接收的第一报文次数达到预设阀值时，若所述发送端发送链路可用状态定时器处于有效状态，则将所述第一报文重组成短报文发送至所述接收端；
若所述发送端发送链路可用状态定时器处于超期状态，或重传所述短报文的次数达到预设阀值，则上报无线资源控制层进行空口协议重连。
在一个实施例中，当轮询定时器超期且满足双无条件时，在未收到所述接收端肯定确认的报文集合中将报文序号最小的第二报文发送至所述接收端，包括：
若未收到所述接收端肯定确认的报文集合中的全部报文的重传次数均已达到预设阀值，则选择报文序号最小的第二报文发送至所述接收端，否则将报文序号最小且重传次数未达到预设阀值的第二报文发送至所述接收端。
本申请还提供一种重发超限及双无条件下RLC确认模式增强方法，应用于接收端，包括：
向发送端发送状态报文，所述状态报文包括对未接收的第一报文的否定确认，以及其他报文的肯定确认；
接收所述发送端发送的短报文，并根据所述短报文更新接收窗口状态变量以及向所述发送端反馈状态报告；
接收所述发送端发送的携带Polling位的第二报文，并根据所述第二报文触发向所述发送端发送状态报文操作。
在一个实施例中，所述短报文为数据字段长度为0的特殊RLC/AM数据报文，且所述短报文序号为所述第一报文序号。
在一个实施例中，所述第二报文为所述发送端在未收到肯定确认的报文集合中挑选的报文序号最小的报文。
本申请还提供一种应用于基站或终端的发送端，包括：
第一处理模块，用于当重传接收端未接收的第一报文次数达到预设阀值时，将所述第一报文重组成短报文发送至所述接收端；其中，所述第一报文为RLC/AM数据报文，短报文为数据字段长度为0的特殊RLC/AM数据报文，且所述短报文序号为所述第一报文序号；
第二处理模块，用于当轮询定时器超期且满足双无条件时，在未收到所 述接收端肯定确认的报文集合中将报文序号最小的第二报文发送至所述接收端；其中，所述双无条件为发送缓冲区和重发缓冲区当前时刻无数据可发送，以及因发送窗口无空位无法发新报文。
在一个实施例中，所述第一处理模块在重传接收端未接收的第一报文前，还具体用于：
接收所述接收端发送的状态报文，并启动所述发送端发送链路可用状态定时器；其中，所述状态报文包括对所述第一报文的否定确认，以及对其他报文的肯定确认。
本申请还提供一种应用于基站或终端的接收端，包括：
第三处理模块，用于向发送端发送状态报文，所述状态报文包括对未接收的第一报文的否定确认，以及其他报文的肯定确认；
第四处理模块，用于接收所述发送端发送的短报文，并根据所述短报文更新接收窗口状态变量以及向所述发送端反馈状态报告；
第五处理模块，用于接收所述发送端发送的携带Polling位的第二报文，并根据所述第二报文触发向所述发送端发送状态报文操作。
本申请还提供一种发送端设备，包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序，所述处理器执行所述计算机程序时实现如上述任一种所述的应用于发送端的重发超限及双无条件下RLC确认模式增强方法的步骤。
本申请还提供一种接收端设备，包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序，所述处理器执行所述计算机程序时实现如上述任一种所述的应用于接收端的重发超限及双无条件下RLC确认模式增强方法的步骤。
本申请还提供一种处理器可读存储介质，所述处理器可读存储介质存储有计算机程序，所述计算机程序用于使所述处理器执行如上所述应用于发送端的重发超限及双无条件下RLC确认模式增强方法，或应用于接收端的重发超限及双无条件下RLC确认模式增强方法的步骤。
本申请提供的重发超限及双无条件下RLC确认模式增强方法及装置，当重传接收端未接收的第一报文次数达到预设阀值时，将所述第一报文重组成短报文发送至所述接收端；其中，所述第一报文为RLC/AM数据报文，短报 文为数据字段长度为0的特殊RLC/AM数据报文，且所述短报文序号为所述第一报文序号；当轮询定时器超期且满足双无条件时，在未收到所述接收端肯定确认的报文集合中将报文序号最小的第二报文发送至所述接收端；其中，所述双无条件为发送缓冲区和重发缓冲区当前时刻无数据可发送，以及因发送窗口无空位无法发新报文。由此可见，本申请一方面通过将重发超限的报文重组成短报文发送至接收端的方法，可以快速推动发送和接收窗口向前滑动，避免过早上报RRC进行空口协议重连；另一方面采用更合理的选择某些报文序号对应的报文进行重发的方方，可以尽快触发接收端发送status报文避免带来副作用。通过上述方法，使得RLC的AM模式在个别报文重传超限时可以避免连接重建、在双无条件下减少协议停顿时间，进而达到增强系统的性能的目的。本申请可以与现有第五代新无线系统5G NR(5th generation New Radio)标准保持兼容，配合PDCP、RRC等层协议，可以有效的提高用户服务质量和增强系统性能。
附图说明
为了更清楚地说明本申请或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一一简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请提供的应用于发送端的无线链路控制层在确认模式下的通信方法的流程示意图之一；
图2是本申请提供的应用于发送端的无线链路控制层在确认模式下的通信方法的流程示意图之二；
图3是本申请提供的应用于发送端的无线链路控制层在确认模式下的通信方法的流程示意图之三；
图4是本申请提供的协议栈总体结构示意图；
图5是本申请提供的短报文格式的示意图之一；
图6是本申请提供的短报文格式的示意图之二；
图7是本申请提供的应用于发送端的无线链路控制层在确认模式下的通信方法的流程示意图之四；
图8是本申请提供的应用于接收端的无线链路控制层在确认模式下的通 信方法的流程示意图；
图9是本申请提供的发送端装置的结构示意图；
图10是本申请提供的接收端装置的结构示意图；
图11是本申请提供的发送端设备的结构示意图；
图12是本申请提供的接收端设备的结构示意图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合本申请中的附图，对本申请中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
需要说明的是，如图4所示，基站gNB(gNodeB)和终端UE(User Equipment)间通过空口协议进行通信。基站和核心网接收过来的数据包首先经过分组数据汇聚协议层PDCP(Packet Data Convegence Protocol)，在进行IP(Internet Protocol)包头压缩和加密后，传输至无线链路控制层RLC(Radio Link Control),按照媒体接入控制层MAC(Media Access Control)的传输需求进行分段和串接后，再传输至MAC层，最终从空中接口形成无线信号发送。其中，RLC协议遵循5G标准ts38.322或4G标准ts36.322，提供直通模式TM(Transparent Mode)、非确认模式UM(Unacknowledge Mode)、确认模式AM(Acknowledge Mode)等传输服务模式。RLC AM模式是面向连接的服务模式，可实现自动重传请求ARQ(Automatic Repeat reQuest)纠错、重复包检测、分段/重组和RLC SDU丢弃处理等功能，和MAC层提供的混合自动重传请求HARQ(Hybrid Automatic Repeat reQuest)协同实现了一种更可靠的传输服务。
此外，需要说明的是，本申请提供的技术方案可以适用于多种系统，尤其是5G系统。例如适用的系统可以是全球移动通讯(global system of mobile communication，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)通用分组无线业务(general packet radio service，GPRS)系统、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD) 系统、LTE时分双工(time division duplex，TDD)系统、高级长期演进(long term evolution advanced，LTE-A)系统、通用移动系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)系统、5G新空口(New Radio,NR)系统等。这多种系统中均包括终端设备和网络设备。系统中还可以包括核心网部分，例如演进的分组系统(Evloved Packet System,EPS)、5G系统(5GS)等。
本申请涉及的终端设备，可以是指向用户提供语音和/或数据连通性的设备，具有无线连接功能的手持式设备、或连接到无线调制解调器的其他处理设备等。在不同的系统中，终端设备的名称可能也不相同，例如在5G系统中，终端设备可以称为用户设备(User Equipment，UE)。无线终端设备可以经无线接入网(Radio Access Network,RAN)与一个或多个核心网(Core Network,CN)进行通信，无线终端设备可以是移动终端设备，如移动电话(或称为“蜂窝”电话)和具有移动终端设备的计算机，例如，可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置，它们与无线接入网交换语言和/或数据。例如，个人通信业务(Personal Communication Service，PCS)电话、无绳电话、会话发起协议(Session Initiated Protocol，SIP)话机、无线本地环路(Wireless Local Loop，WLL)站、个人数字助理(Personal Digital Assistant，PDA)等设备。无线终端设备也可以称为系统、订户单元(subscriber unit)、订户站(subscriber station)，移动站(mobile station)、移动台(mobile)、远程站(remote station)、接入点(access point)、远程终端设备(remote terminal)、接入终端设备(access terminal)、用户终端设备(user terminal)、用户代理(user agent)、用户装置(user device)，本申请实施例中并不限定。由于终端设备与其它网络设备(例如核心网设备、接入网设备(即基站))一起构成一个可支持通信的网络，在本申请中，终端设备也视为一种网络设备。
本申请实施例涉及的网络设备，可以是基站，该基站可以包括多个为终端提供服务的小区，也可以是CU(Central Unit，集中控制单元)或者DU(Distributed Unit，分布式单元)。根据具体应用场合不同，网络设备又可以称为接入点，或者可以是接入网中在空中接口上通过一个或多个扇区与无线终端设备通信的设备，或者其它名称。网络设备可用于将收到的空中帧与网 际协议(Internet Protocol，IP)分组进行相互更换，作为无线终端设备与接入网的其余部分之间的路由器，其中接入网的其余部分可包括网际协议(IP)通信网络。网络设备还可协调对空中接口的属性管理。例如，本申请实施例涉及的网络设备可以是全球移动通信系统(Global System for Mobile communications，GSM)或码分多址接入(Code Division Multiple Access，CDMA)中的网络设备(Base Transceiver Station，BTS)，也可以是带宽码分多址接入(Wide-band Code Division Multiple Access，WCDMA)中的网络设备(NodeB)，还可以是长期演进(long term evolution，LTE)系统中的演进型网络设备(evolutional Node B，eNB或e-NodeB)、5G网络架构(next generation system)中的5G基站(gNB)，也可以是家庭演进基站(Home evolved Node B，HeNB)、中继节点(relay node)、家庭基站(femto)、微微基站(pico)等，本申请实施例中并不限定。在一些网络结构中，网络设备可以包括集中单元(centralized unit，CU)节点和分布单元(distributed unit，DU)节点，集中单元和分布单元也可以地理上分开布置。
在本申请中，基站和终端都是既可以做发送端又可以做接收端。不失一般性，在下面的实施例中，以基站为发送端，终端为接收端进行说明。
下面对本申请进行具体说明。
如图1所示，本申请提供的应用于发送端的重发超限及双无条件下RLC确认模式增强方法，包括：
步骤101：当重传接收端未接收的第一报文次数达到预设阀值时，将所述第一报文重组成短报文发送至所述接收端；其中，所述第一报文为RLC/AM数据报文，短报文为数据字段长度为0的特殊RLC/AM数据报文，且所述短报文序号为所述第一报文序号；
在本步骤中，基站在重传终端未接收的第一报文前，先接收终端发送的状态报文，该状态报文包括终端未接收完全的SN报文或其分段的否定应答位NACK信息和其他报文显式或隐含的肯定应答位ACK信息，且短报文序号与第一报文序号相同。基站接收终端发送的状态报文后，发现sn-1、sn+1、……、sn+i等报文的ACK，启动该终端发送链路可用状态定时器TxLinkTimer(该定时器为本申请新设，每当状态报文中显式或隐含地含有新的被确认的SN时需要重新启动该定时器)，该定时器将在预定义时间 TxLinkLive后失效；发现序号为sn的报文或其分段需要重发，将其重传次数+1后，又发现重传已超过最大次数而定时器TxLinkTimer有效，则构造短报文发送至终端。具体的，如图2所示，当SN已超过最大重传次数maxRetxThreshold时，如果定时器TxLinkTimer处于有效状态，则不按现有ts38.322做法(向RRC报告、启动RRC重连接)，而是将SN的PDU数据长度置为0(即data部分为空)形成短报文，然后发向终端；如果TxLinkTimer处于超期状态下，则仍按现有ts38.322做法处理(向RRC报告、启动RRC重连接)。其中，短报文的PDU格式如图5和图6所示。
步骤102：当轮询定时器超期且满足双无条件时，在未收到所述接收端肯定确认的报文集合中将报文序号最小的第二报文发送至所述接收端；其中，所述双无条件为发送缓冲区和重发缓冲区当前时刻无数据可发送，以及因发送窗口无空位无法发新报文。
在本步骤中，如图3所示，基站在步骤2至步骤3的处理过程中，当满足标准ts38.322之5.3.3.2节的条件时，在当前发送的AM PDU中设置Polling标记位，当前的PDU的SN存为SNp，此时启动定时器t-PollRetransmit。如果t-PollRetransmit超期且满足双无条件，在还未收到肯定确认的报文中优先选择SN最小的且未达最大重发次数的报文进行重发，并携带Polling位，如图7所示，具体处理过程为：经过一定时间，定时器t-PollRetransmit超期(说明还没有收到包含SNp之ACK的status报文)，并且满足双无条件，发送端AM实体从当前发送窗口中优先选择还未收到肯定确认的报文序号最小的且未达最大重发次数的SN报文(如果所有未收到确认的报文都已达到最大重发次数，则选择其中SN最小的报文)；在选出需要重发的SN报文后，同时在报文中插入Polling标记位，由RLC AM实体将其发送出去；其中，若在t-PollRetransmit定时器超期之前，收到包含对SNp的status报文，则停止和重置t-PollRetransmit定时器。需要说明的是，按照现有协议标准给出的方案，是找一个已发给终端最大SN的PDU进行重传并设置Polling，或者是随机找一个未收到肯定确认的SN所对应的PDU进行重传并设置Polling。其中，若用最大的SN之PDU，则在接收端该SN可能不满足SN<RX_Highest_Status或SN>＝RX_Next+AM_Window_Size，从而不能及时触发status报告；若用最小的SN之PDU，则可能已率先到达最大重发次数，再次重发就容易触 发链路故障事件，引起rlc连接复位。
本申请提供的重发超限及双无条件下RLC确认模式增强方法，当重传接收端未接收的第一报文次数达到预设阀值时，将所述第一报文重组成短报文发送至所述接收端；其中，所述第一报文为RLC/AM数据报文，短报文为数据字段长度为0的特殊RLC/AM数据报文，且所述短报文序号为所述第一报文序号；当轮询定时器超期且满足双无条件时，在未收到所述接收端肯定确认的报文集合中将报文序号最小的第二报文发送至所述接收端；其中，所述双无条件为发送缓冲区和重发缓冲区当前时刻无数据可发送，以及因发送窗口无空位无法发新报文。由此可见，本申请一方面通过将重发超限的报文重组成短报文发送至接收端的方法，可以快速推动发送和接收窗口向前滑动，避免过早上报RRC进行空口协议重连；另一方面采用更合理的选择某些报文序号对应的报文进行重发的方方，可以尽快触发接收端发送status报文避免带来副作用。通过上述方法，使得RLC的AM模式在个别报文重传超限时可以避免连接重建、在双无条件下减少协议停顿时间，进而达到增强系统的性能的目的。本申请可以与现有第五代新无线系统5G NR(5th generation New Radio)标准保持兼容，配合PDCP、RRC等层协议，可以有效的提高用户服务质量和增强系统性能。
基于上述实施例的内容，在本实施例中，在所述重传接收端未接收的第一报文前，还包括：
接收所述接收端发送的状态报文，并启动所述发送端发送链路可用状态定时器；其中，所述状态报文包括对所述第一报文的否定确认，以及其他报文的肯定确认。
在本实施例中，当状态报文中显式或隐含地含有以前未被确认的序号时，发送端重新启动发送链路可用状态定时器。
基于上述实施例的内容，在本实施例中，
所述当重传接收端未接收的第一报文次数达到预设阀值时，将所述第一报文重组成短报文发送至所述接收端，包括：
当重传接收端未接收的第一报文次数达到预设阀值时，若所述发送端发送链路可用状态定时器处于有效状态，则将所述第一报文重组成短报文发送至所述接收端；
若所述发送端发送链路可用状态定时器处于超期状态，或重传所述短报文的次数达到预设阀值，则上报无线资源控制层进行空口协议重连。
在本实施例中，若在预定时间内，未收到接收端发来的包括对所述短报文肯定确认的状态报文，则重发短报文。
基于上述实施例的内容，在本实施例中，当轮询定时器超期且满足双无条件时，在未收到所述接收端肯定确认的报文集合中将报文序号最小的第二报文发送至所述接收端，包括：
若未收到所述接收端肯定确认的报文集合中的全部报文的重传次数均已达到预设阀值，则选择报文序号最小的第二报文发送至所述接收端，否则将报文序号最小且重传次数未达到预设阀值的第二报文发送至所述接收端。
下面通过具体实施例进行说明：
第一实施例：
在本实施例中，如图2所示，当个别报文超最大重发次数时，采用发送包含该报文序号SN之短报文的方法，快速推动发送和接收窗口向前滑动，避免过早上报RRC进行空口协议重连。
在本实施例中，所述个别报文超最大重发次数，是指发送端在一个预先定义的时间内有其他报文发送成功(已收到确认应答)，这些报文没有超最大重发次数；所述短报文是一个RLC AM模式的PDU，它的数据长度置为0，它的序号SN为超过最大重发次数的那个PDU的序号；所述推动发送窗口向前滑动，是指发送端发送窗口的下沿TX_Next_Ack向上移动；所述推动接收窗口向前滑动，是指更新RX_Next状态变量，同时根据当前短报文的SN序号，按需更新RX_Highest_Status，RX_Next_Highest和RX_Next_Status_Trigger等状态变量；所述避免过早上报RRC进行空口协议重连，是指不在达到最大重发次数时就向RRC上报这一事件从而触发空口协议重连，而是继续重发短报文达到预先定义的后续次数时才上报RRC进行重连操作。
在本实施例中，如图7所示，当轮询定时器t-PollRetransmit超期需发Polling时，若发送端处于发送缓冲区和重发缓冲区无数据可发，以及因发送窗口无空位等原因无法发新报文等条件(简称“双无条件”)，采用合理地选择某些SN的报文进行重发的方法，以尽快触发接收端发送status报文且避免带来副作用。其中，所述合理地选择某些SN的报文进行重发的方法，是 指采用在还未收到肯定确认的报文中优先选择SN最小的且未达最大重发次数的报文进行重发(如果所有未收到确认的报文都已达到最大重发次数，则选择其中SN最小的报文)，并携带Polling位；所述尽快触发接收端发送status报文，是指较小SN的报文到达接收端后，SN满足标准ts38.322所规定的SN<RX_Highest_Status或SN>＝RX_Next+AM_Window_Size的可能性更大，从而实现statu报文的触发；所述避免带来副作用，是指所重发的报文未达最大重发次数，从而避免引起RRC进行空口协议重连等相关处理。
由此可见，本申请公开了无线链路控制协议RLC在确认模式AM下减少连接重建以及轮询触发的重传报文方法，涉及5G、4G等无线通信网，能够解决某些情况下不必要的连接重建或协议停顿时间较长等问题。本申请包括：当只有个别报文超最大重发次数，采用发送包含该报文序号SN之短报文的方法，促进发送和接收窗口快速滑动，避免过早上报RRC进行空口协议重连；当轮询定时器超期需发轮询时，若发送缓冲区和重发缓冲区无数据可发，以及因发送窗口无空位等原因无法发新报文，采用在还未收到肯定确认的报文中优先选择SN最小的且未达最大重发次数的报文进行重传，并携带Polling位。本申请适用于5G、4G等基站和终端间数据传输，能够有效增强无线链路控制层RLC在确认模式AM下的通信性能。
第二实施例：
在本实施例中，如图3所示，在RLC AM模式下，基站gNB发送端根据业务特性将PDCP层的数据包下发到RLC层的AM实体，形成RLC AM实体的待发数据。gNB发送端MAC层按需从RLC层AM等实体获取待发数据，将一个或多个RLC PDU组装成一个MAC PDU。其中，由RLC AM实体待发数据形成的RLC AM PDU包含SN、P、SI、SO和data等字段。gNB发送端物理层将MAC PDU从空中接口发送至UE接收端。UE接收端物理层收到从空中接口发送来的报文，解码成功之后上传到MAC层，MAC对收到的报文进行解包处理，获得AM PDU报文并上传到RLC的AM实体。假设在某段时间内完全接收的各AM PDU报文包含的SN号为sn-1、sn+1、……、sn+i，sn+i位于接收窗口内，但SN报文并未接受完全。由此，RLC AM接收端构造相应的状态报文并发给基站侧的RLC AM发送端，状态报文包含SN报文或其分段的NACK信息和其他报文显式或隐含的ACK信息。gNB收到状态 报文，发现sn-1、sn+1、……、sn+i等报文的ACK，启动该终端发送链路可用状态定时器TxLinkTimer，该定时器将在预定义时间TxLinkLive后失效；发现序号为sn的报文或其分段需要重发，将其重传次数+1后，又发现重传已超过最大次数而定时器TxLinkTimer有效，则构造短报文发送到接收方。
如图8所示，本申请提供的应用于接收端的重发超限及双无条件下RLC确认模式增强方法，包括：
步骤201：向发送端发送状态报文，所述状态报文包括对未接收的第一报文的否定确认，以及其他报文的肯定确认；
在本步骤中，UE接收端物理层收到从空中接口发送来的报文，解码成功之后上传到MAC层，MAC对收到的报文进行解包处理，获得AM PDU报文并上传到RLC的AM实体。假设在某段时间内完全接收的各AM PDU报文包含的SN号为sn-1、sn+1、……、sn+i，sn+i位于接收窗口内，但SN报文并未接受完全。由此，RLC AM接收端构造相应的状态报文并发给基站侧的RLC AM发送端，状态报文包含sn报文或其分段的NACK信息和其他报文显式或隐含的ACK信息。
步骤202：接收所述发送端发送的短报文，并根据所述短报文更新接收窗口状态变量以及向所述发送端反馈状态报告；
在本步骤中，如图2所示，UE收方收到基站侧发送的短报文，解析完相应的报文头部后，发现数据长度部分为0，则认为是短报文，根据解析报文头部信息得到的SN号等其他信息，将其缓存的原有sn对应分段(如果有的话)清空，然后更新接收窗口相关状态变量、按需触发status报告。由于data部分为空，RLC AM实体收方并不向上层提交任何数据报文。相应的，基站发方等待含有SN之ACK的status报告，若未按时收到则继续重发该短报文，如果SN的总重发次数超过最大次数maxRetxThreshold+后续次数Δ(Δ为某个预先定义的正整数)，则上报RRC进行重连操作。在同样的信道误码率情况下，短报文发送正确概率得到极大提高，能够快速推动发送和接收窗口向前滑动。因此，本申请既比单纯增大原始报文重发次数的方法更容易推动窗口滑动，也比过早上报RRC进行重连的方法合理。收发双方的其余行为，仍与现有标准ts38.322兼容，并使性能得到提高。
步骤203：接收所述发送端发送的携带Polling位的第二报文，并根据所 述第二报文触发向所述发送端发送状态报文操作。
在本步骤中，如图7所示，终端接收基站发送的携带Polling位的报文，并根据报文触发正常的向基站发送状态报文的流程。
由此可见，本申请当只有个别报文超最大重发次数，采用发送包含该报文序号SN之短报文的方法，促进发送和接收窗口快速滑动，避免过早上报RRC进行空口协议重连；当轮询定时器超期需发轮询时，若发送缓冲区和重发缓冲区无数据可发，以及因发送窗口无空位等原因无法发新报文，采用在还未收到肯定确认的报文中优先选择SN最小的且未达最大重发次数的报文进行重传，并携带Polling位。本申请适用于5G、4G等基站和终端间的数据传输，能够有效增强无线链路控制层RLC在确认模式AM下的通信性能。
基于上述实施例的内容，在本实施例中，所述短报文为数据字段长度为0的特殊RLC/AM数据报文，且所述短报文序号为所述第一报文序号。
基于上述实施例的内容，在本实施例中，所述第二报文为所述发送端在未收到肯定确认的报文集合中挑选的报文序号最小的报文。
此外，如图9所示，为本申请应用于基站或终端的装置结构示意图，该装置包括：
第一处理模块1，用于当重传接收端未接收的第一报文次数达到预设阀值时，将所述第一报文重组成短报文发送至所述接收端；其中，所述第一报文为RLC/AM数据报文，短报文为数据字段长度为0的特殊RLC/AM数据报文，且所述短报文序号为所述第一报文序号；
第二处理模块2，用于当轮询定时器超期且满足双无条件时，在未收到所述接收端肯定确认的报文集合中将报文序号最小的第二报文发送至所述接收端；其中，所述双无条件为发送缓冲区和重发缓冲区当前时刻无数据可发送，以及因发送窗口无空位无法发新报文。
基于上述实施例的内容，在本实施例中，所述第一处理模块在重传接收端未接收的第一报文前，还具体用于：
接收所述接收端发送的状态报文，并启动所述发送端发送链路可用状态定时器；其中，所述状态报文包括对所述第一报文的否定确认，以及对其他报文的肯定确认。
在此需要说明的是，本装置能够实现应用于基站或终端的发送端的重发 超限及双无条件下RLC确认模式增强方法实施例的所有方法步骤并能够达到相同的技术效果，在此不再进行赘述。
此外，如图10所示，为本申请应用于基站或终端的接收端装置的结构示意图，该装置包括：
第三处理模块3，用于向发送端发送状态报文，所述状态报文包括对未接收的第一报文的否定确认，以及其他报文的肯定确认；
第四处理模块4，用于接收所述发送端发送的短报文，并根据所述短报文更新接收窗口状态变量以及向所述发送端反馈状态报告；
第五处理模块5，用于接收所述发送端发送的携带Polling位的第二报文，并根据所述第二报文触发向所述发送端发送状态报文操作。
在此需要说明的是，本装置能够实现应用于接收端的重发超限及双无条件下RLC确认模式增强方法实施例的所有方法步骤并能够达到相同的技术效果，在此不再进行赘述。
图11是本申请提供的发送端设备的结构示意图之一，包括存储器1120，收发机1100，处理器1110。
其中，在图11中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器1110代表的一个或多个处理器和存储器1120代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机1100可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元，这些传输介质包括无线信道、有线信道、光缆等传输介质。处理器1110负责管理总线架构和通常的处理，存储器1120可以存储处理器1110在执行操作时所使用的数据。
处理器1110可以是中央处埋器(CPU)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field－Programmable Gate Array，FPGA)或复杂可编程逻辑器件(Complex Programmable Logic Device，CPLD)，处理器也可以采用多核架构。
存储器1120，用于存储计算机程序；收发机1100，用于在所述处理器的控制下收发数据；处理器1110，用于读取所述存储器中的计算机程序并执行 以下操作：
当重传接收端未接收的第一报文次数达到预设阀值时，将所述第一报文重组成短报文发送至所述接收端；其中，所述第一报文为RLC/AM数据报文，短报文为数据字段长度为0的特殊RLC/AM数据报文，且所述短报文序号为所述第一报文序号；
当轮询定时器超期且满足双无条件时，在未收到所述接收端肯定确认的报文集合中将报文序号最小的第二报文发送至所述接收端；其中，所述双无条件为发送缓冲区和重发缓冲区当前时刻无数据可发送，以及因发送窗口无空位无法发新报文。
在此需要说明的是，本申请提供的发送端设备能够实现应用于发送端设备的重发超限及双无条件下RLC确认模式增强方法实施例的所有方法步骤并能够达到相同的技术效果，在此不再进行赘述。
图12是本申请提供的发送端设备的结构示意图之一，包括存储器1220，收发机1200，处理器1210。
其中，在图12中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器1210代表的一个或多个处理器和存储器1220代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机1200可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元，这些传输介质包括无线信道、有线信道、光缆等传输介质。处理器1210负责管理总线架构和通常的处理，存储器1220可以存储处理器1210在执行操作时所使用的数据。
处理器1210可以是中央处埋器(CPU)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field－Programmable Gate Array，FPGA)或复杂可编程逻辑器件(Complex Programmable Logic Device，CPLD)，处理器也可以采用多核架构。
存储器1220，用于存储计算机程序；收发机1200，用于在所述处理器的控制下收发数据；处理器1210，用于读取所述存储器中的计算机程序并执行以下操作：
向发送端发送状态报文，所述状态报文包括对未接收的第一报文的否定确认，以及其他报文的肯定确认；
接收所述发送端发送的短报文，并根据所述短报文更新接收窗口状态变量以及向所述发送端反馈状态报告；
接收所述发送端发送的携带Polling位的第二报文，并根据所述第二报文触发向所述发送端发送状态报文操作。
在此需要说明的是，本申请提供的接收端设备能够实现应用于接收端设备的重发超限及双无条件下RLC确认模式增强方法实施例的所有方法步骤并能够达到相同的技术效果，在此不再进行赘述。
需要说明的是，本申请中对单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个处理器可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)或处理器(processor)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
在此需要说明的是，本申请提供的上述装置，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
另一方面，本申请还提供一种处理器可读存储介质，所述处理器可读存储介质存储有计算机程序，所述计算机程序用于使所述处理器执行上述实施例中所述的方法。
所述处理器可读存储介质可以是处理器能够存取的任何可用介质或数据 存储设备，包括但不限于磁性存储器(例如软盘、硬盘、磁带、磁光盘(MO)等)、光学存储器(例如CD、DVD、BD、HVD等)、以及半导体存储器(例如ROM、EPROM、EEPROM、非易失性存储器(NAND FLASH)、固态硬盘(SSD))等。
由上述实施例可见，处理器可读存储介质存储有计算机程序，所述计算机程序用于使所述处理器执行上述重发超限及双无条件下RLC确认模式增强方法的步骤。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机可执行指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机可执行指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些处理器可执行指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的处理器可读存储器中，使得存储在该处理器可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些处理器可执行指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要 求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (13)

  1. 一种重发超限及双无条件下RLC确认模式增强方法，应用于发送端，包括：
    当重传接收端未接收的第一报文次数达到预设阀值时，将所述第一报文重组成短报文发送至所述接收端；其中，所述第一报文为RLC/AM数据报文，短报文为数据字段长度为0的特殊RLC/AM数据报文，且所述短报文序号为所述第一报文序号；
    当轮询定时器超期且满足双无条件时，在未收到所述接收端肯定确认的报文集合中将报文序号最小的第二报文发送至所述接收端；其中，所述双无条件为发送缓冲区和重发缓冲区当前时刻无数据可发送，以及因发送窗口无空位无法发新报文。
  2. 根据权利要求1所述的重发超限及双无条件下RLC确认模式增强方法，其特征在于，在所述重传接收端未接收的第一报文前，还包括：
    接收所述接收端发送的状态报文，并启动所述发送端发送链路可用状态定时器；其中，所述状态报文包括对所述第一报文的否定确认，以及其他报文的肯定确认。
  3. 根据权利要求2所述的重发超限及双无条件下RLC确认模式增强方法，其特征在于，所述当重传接收端未接收的第一报文次数达到预设阀值时，将所述第一报文重组成短报文发送至所述接收端，包括：
    当重传接收端未接收的第一报文次数达到预设阀值时，若所述发送端发送链路可用状态定时器处于有效状态，则将所述第一报文重组成短报文发送至所述接收端；
    若所述发送端发送链路可用状态定时器处于超期状态，或重传所述短报文的次数达到预设阀值，则上报无线资源控制层进行空口协议重连。
  4. 根据权利要求1所述的重发超限及双无条件下RLC确认模式增强方法，其特征在于，当轮询定时器超期且满足双无条件时，在未收到所述接收端肯定确认的报文集合中将报文序号最小的第二报文发送至所述接收端，包括：
    若未收到所述接收端肯定确认的报文集合中的全部报文的重传次数均已达到预设阀值，则选择报文序号最小的第二报文发送至所述接收端， 否则将报文序号最小且重传次数未达到预设阀值的第二报文发送至所述接收端。
  5. 一种重发超限及双无条件下RLC确认模式增强方法，应用于接收端，包括：
    向发送端发送状态报文，所述状态报文包括对未接收的第一报文的否定确认，以及其他报文的肯定确认；
    接收所述发送端发送的短报文，并根据所述短报文更新接收窗口状态变量以及向所述发送端反馈状态报告；
    接收所述发送端发送的携带Polling位的第二报文，并根据所述第二报文触发向所述发送端发送状态报文操作。
  6. 根据权利要求5所述的重发超限及双无条件下RLC确认模式增强方法，其特征在于，所述短报文为数据字段长度为0的特殊RLC/AM数据报文，且所述短报文序号为所述第一报文序号。
  7. 根据权利要求5所述的重发超限及双无条件下RLC确认模式增强方法，其特征在于，所述第二报文为所述发送端在未收到肯定确认的报文集合中挑选的报文序号最小的报文。
  8. 一种应用于基站或终端的发送端，包括：
    第一处理模块，用于当重传接收端未接收的第一报文次数达到预设阀值时，将所述第一报文重组成短报文发送至所述接收端；其中，所述第一报文为RLC/AM数据报文，短报文为数据字段长度为0的特殊RLC/AM数据报文，且所述短报文序号为所述第一报文序号；
    第二处理模块，用于当轮询定时器超期且满足双无条件时，在未收到所述接收端肯定确认的报文集合中将报文序号最小的第二报文发送至所述接收端；其中，所述双无条件为发送缓冲区和重发缓冲区当前时刻无数据可发送，以及因发送窗口无空位无法发新报文。
  9. 根据权利要求8所述的发送端，其特征在于，所述第一处理模块在重传接收端未接收的第一报文前，还具体用于：
    接收所述接收端发送的状态报文，并启动所述发送端发送链路可用状态定时器；其中，所述状态报文包括对所述第一报文的否定确认，以及对其他报文的肯定确认。
  10. 一种应用于基站或终端的接收端，包括：
    第三处理模块，用于向发送端发送状态报文，所述状态报文包括对未接收的第一报文的否定确认，以及其他报文的肯定确认；
    第四处理模块，用于接收所述发送端发送的短报文，并根据所述短报文更新接收窗口状态变量以及向所述发送端反馈状态报告；
    第五处理模块，用于接收所述发送端发送的携带Polling位的第二报文，并根据所述第二报文触发向所述发送端发送状态报文操作。
  11. 一种发送端设备，包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序，其特征在于，所述处理器执行所述计算机程序时实现如权利要求1至4任一项所述的重发超限及双无条件下RLC确认模式增强方法的步骤。
  12. 一种接收端设备，包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序，其特征在于，所述处理器执行所述计算机程序时实现如权利要求5至7任一项所述的重发超限及双无条件下RLC确认模式增强方法的步骤。
  13. 一种非暂态计算机可读存储介质，其上存储有计算机程序，其特征在于，该程序被处理器执行时实现如权利要求1至4任一项所述的重发超限及双无条件下RLC确认模式增强方法的步骤，或执行如权利要求5至7任一项所述的重发超限及双无条件下RLC确认模式增强方法的步骤。
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