WO2018202110A1 - 数据传输方法、装置、设备及系统 - Google Patents

数据传输方法、装置、设备及系统 Download PDF

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Publication number
WO2018202110A1
WO2018202110A1 PCT/CN2018/085530 CN2018085530W WO2018202110A1 WO 2018202110 A1 WO2018202110 A1 WO 2018202110A1 CN 2018085530 W CN2018085530 W CN 2018085530W WO 2018202110 A1 WO2018202110 A1 WO 2018202110A1
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WO
WIPO (PCT)
Prior art keywords
sdu
complete
segment
rlc pdu
rlc
Prior art date
Application number
PCT/CN2018/085530
Other languages
English (en)
French (fr)
Inventor
许斌
曹振臻
李秉肇
王学龙
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to BR112019023248A priority Critical patent/BR112019023248A2/pt
Priority to EP22198096.4A priority patent/EP4178253A1/en
Priority to EP18794655.3A priority patent/EP3637843B1/en
Priority to CA3062488A priority patent/CA3062488C/en
Priority to RU2019139371A priority patent/RU2762801C2/ru
Priority to JP2019560639A priority patent/JP7046979B2/ja
Publication of WO2018202110A1 publication Critical patent/WO2018202110A1/zh
Priority to US16/674,843 priority patent/US10959129B2/en

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Classifications

    • 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
    • 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
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • 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
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0079—Formats for control data
    • 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
    • H04W28/10—Flow control between communication endpoints
    • H04W28/14—Flow control between communication endpoints using intermediate storage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

Definitions

  • the present application relates to communication technologies, and in particular, to a data transmission method, apparatus, device, and system.
  • the Radio Link Control (RLC) layer has three working modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM).
  • TM Transparent Mode
  • UM Unacknowledged Mode
  • AM Acknowledged Mode
  • the RLC layer under the UM mainly performs segment cascading, reordering, and repeated detection.
  • 5G Generation 5G Generation
  • the RLC layer under UM in order to shorten the processing delay, the RLC layer under UM no longer performs reordering and re-detection functions, and is implemented by the Packet Data Convergence Protocol (PDCP) layer. Perform reordering and repeat detection.
  • PDCP Packet Data Convergence Protocol
  • the embodiment of the present application provides a data transmission method, device, device, and system, which are used to solve the problem that the RLC layer under the UM in the prior art performs data transmission.
  • the present application provides a data transmission method, including: receiving, by a receiving end, an RLC PDU; the receiving end determining whether the RLC PDU includes a complete SDU or an SDU segment, and the RLC PDU is transmitted by using UM; As a result of the judgment, the complete SDU or the complete SDU assembled by the SDU segment is transmitted to the packet data convergence protocol PDCP layer.
  • the receiving end determines whether the RLC PDU includes a complete SDU or an SDU segment, and transmits the complete SDU or the complete SDU assembled into the SDU segment to the PDCP layer according to the result of the judgment. Data reception of the RLC layer under UM in 5G. In addition, since the receiving end directly transmits the complete SDU to the PDCP layer, the processing delay caused by the RLC layer waiting for reordering is avoided.
  • the receiving end determines whether the RLC PDU includes a complete SDU or an SDU segment, and the receiving end determines whether the RLC PDU includes an RLC header; when the RLC PDU does not include the RLC header The receiving end determines that the RLC PDU includes a complete SDU; when the RLC PDU includes an RLC header, the receiving end determines that the RLC PDU includes an SDU segment.
  • the receiving end can determine whether the RLC PDU contains a complete SDU or an SDU segment by determining whether the RLC PDU includes an RLC packet header.
  • the RLC PDU does not need to include the RLC header, thereby reducing transmission overhead.
  • the receiving end determines whether the RLC PDU includes an RLC packet header, and includes: the receiving end, according to an indication of the MAC header of the media access control MAC PDU, indicating whether the RLC PDU includes an RLC packet header Information, determining whether the RLC PDU includes an RLC header; wherein the MAC PDU includes the RLC PDU.
  • the SN of the complete SDU is not included in the RLC header of the RLC PDU.
  • the RLC PDU includes a complete SDU
  • the SN of the complete SDU is not included in the RLC header, thereby reducing transmission overhead.
  • the receiving end transmits the complete SDU or the complete SDU assembled into the SDU segment to the PDCP layer according to the result of the judgment, including:
  • the receiving end segments the SDU into the buffer window according to the receiving sequence, and determines whether the complete SDU to which the SDU segment belongs is stored in the buffer window. All SDU segments required, in the buffer window, store the most recently received M SDU segments that failed to be assembled into a complete SDU according to the receiving order; when the cache window stores the complete SDU to which the SDU segment belongs When all SDU segments are required, the receiving end assembles and transmits the assembled complete SDU to the PDCP layer, where M is an integer greater than 0 and less than or equal to the size of the buffer window;
  • the receiving end transmits the complete SDU included in the RLC PDU to the PDCP layer.
  • the complete SDU assembled by the SDU segment can be transmitted to the PDCP layer based on the buffer window manner, ensuring that the SDU segment does not stay in the buffer for a long time and occupies buffer.
  • the method further includes: the receiving end deleting the SDU segment in the buffer window for assembling the complete SDU, and rearranging the remaining SDU segments in the buffer window in the receiving order. .
  • the receiving end puts the SDU segment into the buffer window according to the receiving order, and further includes: when the number of segments in the buffer window is equal to the size of the buffer window, the receiving end The earliest received SDU segment in the buffer window and other SDU segments belonging to the same complete SDU as the earliest received SDU segment are deleted, and the remaining SDU segments in the buffer window are rearranged in the order of reception.
  • the method further includes:
  • the receiving end restarts the timer
  • the receiving end deletes the first SDU segments received in the buffer window and other SDU segments belonging to the same complete SDU with each SDU segment in the N SDU segments.
  • the remaining SDU segments in the buffer window are rearranged in the order of reception, and N is an integer greater than 0 and less than or equal to the size of the buffer window.
  • the receiving end transmits the complete SDU or the complete SDU assembled into the SDU segment to the PDCP layer according to the result of the judgment, including:
  • the receiving end determines whether all SDU segments required for assembling the complete SDU to which the SDU segment belongs are received; when the assembly is received When all SDU segments required for the complete SDU to which the SDU segment belongs, the receiving end assembles, transmits the assembled complete SDU to the PDCP layer, and stops the timer; wherein the timer and the SDU Corresponding to the complete SDU to which the segment belongs;
  • the receiving end transmits the complete SDU included in the RLC PDU to the PDCP layer.
  • the complete SDU assembled by the SDU segment can be transmitted to the PDCP layer based on a complete SDU corresponding to a timer, so that the SDU segments belonging to the same complete SDU are not Stay in the buffer for a long time and take up the buffer.
  • the method further includes: when the timer expires, the receiving end discards the SDU segment and the SDU segment that belongs to the same complete SDU with the SDU segment.
  • the receiving end determines whether all the SDU segments required for assembling the complete SDU to which the SDU segment belongs are received, and further includes: when the SDU is divided into When the segment is the first received SDU segment of the complete SDU to which the SDU segment belongs, the receiver starts the timer.
  • the receiving end determines whether all the SDU segments required for assembling the complete SDU to which the SDU segment belongs are received, and the receiving end, Determining whether the timer is running; when the timer is running, the receiving end restarts the timer; when the timer is not running, the receiving end starts the timer.
  • the receiving end transmits the complete SDU or the complete SDU assembled into the SDU segment to the PDCP layer according to the result of the judgment, including:
  • the receiving end determines whether all the SDU segments required to assemble the complete SDU to which the SDU segment belongs are received; when the assembly is received When all the SDU segments required for the complete SDU to which the SDU segment belongs, the receiving end assembles and transmits the assembled complete SDU to the PDCP layer; wherein the timer corresponds to the SDU segment;
  • the receiving end transmits the complete SDU included in the RLC PDU to the PDCP layer.
  • the complete SDU assembled by the SDU segment can be transmitted to the PDCP layer based on the implementation of the same timer for all SDU segments, and the SDU segment corresponding to the timer is ensured early.
  • the SDU segment received by the SDU segment corresponding to the timer does not stay in the buffer for a long time, and occupies the buffer.
  • the receiving end determines whether all the SDU segments required for assembling the complete SDU to which the SDU segment belongs are received, and the receiving end, Determining whether the timer is running; when the timer is not running, the receiving end determines that the SDU segment corresponding to the timer is an SDU segment included in the RLC PDU, and starts the timer.
  • the method further includes: when the timer expires, the receiving end segments the SDU corresponding to the timer and the SDU segment received earlier than the SDU segment corresponding to the timer. throw away.
  • the method further includes: when the timer expires, the receiving end determines whether there is an SDU segment waiting to be assembled; when there is an SDU segment waiting to be assembled, the receiving end determines the timing The device corresponds to the most recently received SDU segment in all SDU segments awaiting assembly and starts the timer.
  • the method further includes: when the timer expires, the receiving end is received later than the SDU segment corresponding to the timer, and belongs to the same complete segment as the discarded SDU segment.
  • the SDU segment of the SDU is discarded.
  • the data transmission method provided by the embodiment may be: when the timer expires, in addition to discarding the SDU segment corresponding to the timer and the SDU segment received earlier than the SDU segment corresponding to the timer, The SDU segment received after the SDU segment corresponding to the timer is discarded, and the SDU segment belonging to the same complete SDU is discarded, so that the cache space is saved.
  • the present application provides a data transmission method, including: a sending end determines whether a SDU to be sent needs to be segmented; and when the complete SDU does not need to be segmented, the transmitting end includes the complete SDU in the RLC PDU.
  • the RLC header of the RLC PDU does not include the SN of the complete SDU; the sender sends the RLC PDU through the MAC layer, and the RLC PDU is transmitted by using the UM.
  • the complete SDU is included in the RLC PDU, and the RLC PDU is sent out through the MAC layer, and The RLC header of the RLC PDU does not include the SN of the complete SDU, and implements data transmission of the RLC layer under the UM in the 5G.
  • the RL of the complete SDU is not included in the RLC header of the RLC PDU containing the complete SDU, the transmission overhead can be saved.
  • the present application provides a data transmission method, including: determining, by a transmitting end, whether a complete SDU to be sent needs to be segmented; when the complete SDU does not need to be segmented, the transmitting end uses the complete SDU as an RLC. PDU; the sender informs the MAC layer to add indication information indicating that the RLC PDU does not include the RLC header in the MAC header of the MAC PDU, and sends the RLC PDU through the MAC layer, where the MAC PDU includes the RLC PDU.
  • the RLC PDU is transmitted using UM.
  • the transmitting end when the transmitting end determines that the complete SDU to be sent does not need to be segmented, the transmitting end notifies the MAC layer as an RLC PDU, and notifies the MAC layer to add a MAC header in the MAC PDU to indicate the The RLC PDU does not include the indication information of the RLC header, and the RLC PDU is sent out through the MAC layer to implement data transmission of the RLC layer under the UM in the 5G.
  • the transmission overhead can be saved.
  • the application provides a data transmission apparatus, including:
  • a receiving module configured to receive a radio link control layer protocol data unit RLC PDU;
  • a processing module configured to determine whether the RLC PDU includes a complete service data unit SDU or an SDU segment, and according to the result of the judgment, transmit the complete SDU or the complete SDU assembled into the SDU segment to the PDCP layer of the packet data convergence protocol
  • the RLC PDU is transmitted using the no answer mode UM;
  • the processing module determines whether the RLC PDU includes a complete service data unit SDU or an SDU segment, and specifically includes: determining whether the RLC PDU includes an RLC header; and when the RLC PDU does not include the RLC header When it is determined that the RLC PDU contains a complete SDU; when the RLC PDU includes an RLC header, it is determined that the RLC PDU includes an SDU segment.
  • the processing module determines whether the RLC PDU includes an RLC header, and specifically includes:
  • the RLC PDU includes an RLC header according to the indication information in the MAC header of the Medium Access Control MAC PDU indicating whether the RLC PDU includes an RLC header, wherein the MAC PDU includes the RLC PDU.
  • the sequence number SN of the complete SDU is not included in the RLC header of the RLC PDU.
  • the processing module transmits the complete SDU or the complete SDU that is assembled into the packet data convergence protocol PDCP layer according to the result of the judgment, which specifically includes:
  • the SDU segment is put into the buffer window according to the receiving sequence, and it is determined whether all the required SDUs for assembling the SDU segment belong to the cache window are stored in the buffer window.
  • SDU segmentation when all the SDU segments required to assemble the complete SDU to which the SDU segment belongs are stored in the cache window, assembling, and transmitting the assembled complete SDU to the PDCP layer; Storing, in the receiving window, the most recently received M SDU segments M that failed to be assembled into a complete SDU are integers greater than 0 and less than or equal to the size of the buffer window;
  • the complete SDU included in the RLC PDU is transmitted to the PDCP layer.
  • the processing module is further configured to delete the SDU segment used to assemble the complete SDU in the buffer window, and rearrange the remaining SDU segments in the buffer window in the receiving order.
  • the processing module is further configured to: when the number of segments in the buffer window is equal to the size of the buffer window, the earliest received SDU segment in the buffer window and the earliest received SDU The other SDU segments belonging to the same complete SDU are deleted, and the remaining SDU segments in the buffer window are rearranged in the order of reception.
  • the processing module is further configured to: when the SDU segment received in the buffer window is updated, restart the timer; when the timer expires, the earliest received in the buffer window N SDU segments and other SDU segments belonging to the same complete SDU as each of the N SDU segments are deleted, and the remaining SDU segments in the buffer window are rearranged in the order of reception, N An integer greater than 0 and less than or equal to the size of the buffer window.
  • the processing module transmits the complete SDU or the complete SDU that is assembled into the packet data convergence protocol PDCP layer according to the result of the judgment, which specifically includes:
  • the RLC includes the SDU segment
  • the complete SDU included in the RLC PDU is transmitted to the PDCP layer.
  • the processing module is further configured to: when the timer expires, discard the SDU segment and the SDU segment that belongs to the same complete SDU as the SDU segment.
  • the processing module is further configured to start the timer when the SDU segment is the first received SDU segment of the complete SDU to which the SDU segment belongs.
  • the processing module is further configured to: determine whether the timer is running; when the timer is running, restart the timer; when the timer is not running, start the timer .
  • the processing module transmits the complete SDU or the complete SDU that is assembled into the packet data convergence protocol PDCP layer according to the result of the judgment, which specifically includes:
  • the RLC PDU includes the SDU segment
  • the complete SDU included in the RLC PDU is transmitted to the PDCP layer.
  • the processing module is further configured to: determine whether the timer is running; when the timer is not running, determine that the SDU segment corresponding to the timer is an SDU included in the RLC PDU. Segment and start the timer.
  • the processing module is further configured to: when the timer expires, discard the SDU segment corresponding to the timer and the SDU segment received earlier than the SDU segment corresponding to the timer. .
  • the processing module is further configured to: when the timer expires, determine whether there is an SDU segment waiting to be assembled; when there is an SDU segment waiting to be assembled, determine the timer and all waiting The newly received SDU segment in the assembled SDU segment corresponds to and starts the timer.
  • the processing module is further configured to: when the timer expires, receive the SDU segment that is later than the corresponding SDU segment, and belong to the same complete segment as the discarded SDU segment. The SDU segment of the SDU is discarded.
  • the application provides a data transmission apparatus, including:
  • a processing module configured to determine whether a complete service data unit SDU to be sent needs to be segmented, and when the complete SDU does not need to be segmented, the complete SDU is included in a radio link control layer protocol data unit RLC PDU, The RL of the complete SDU is not included in the RLC header of the RLC PDU;
  • a sending module configured to send the RLC PDU by using a media access control MAC layer, where the RLC PDU is transmitted by using a no-answer mode UM.
  • the application provides a data transmission apparatus, including:
  • a processing module configured to determine whether a complete SDU to be sent needs segmentation, when the complete service data unit SDU does not need to be segmented, the complete SDU is used as a radio link control layer protocol data unit RLC PDU;
  • a sending module configured to notify the media intervention control MAC layer to add indication information indicating that the RLC PDU does not include an RLC header in a MAC header of the MAC PDU, and send the RLC PDU through the MAC layer, where the MAC PDU includes the RLC PDU, which is transmitted using the no answer mode UM.
  • the application provides a receiving end, including: a receiver and a processor;
  • the receiver is configured to receive a radio link control layer protocol data unit RLC PDU;
  • the processor is configured to determine whether the RLC PDU includes a complete service data unit SDU or an SDU segment, and according to the result of the judgment, transmit the complete SDU or the complete SDU assembled into the SDU segment to the packet data convergence protocol PDCP. Layer, the RLC PDU is transmitted using the no-acknowledgment mode UM.
  • the processor determines whether the RLC PDU includes a complete SDU or an SDU segment, and specifically includes: determining whether the RLC PDU includes an RLC header; and when the RLC PDU does not include the RLC header, determining The RLC PDU contains a complete SDU; when the RLC header is included in the RLC PDU, it is determined that the RLC PDU contains an SDU segment.
  • the determining whether the RLC PDU includes the RLC header includes: determining, according to the indication information of the MAC header of the medium access control MAC PDU, whether the RLC PDU includes the RLC header, Whether the RLC PDU includes an RLC header; wherein the MAC PDU includes the RLC PDU.
  • the sequence number SN of the complete SDU is not included in the RLC header of the RLC PDU.
  • the processor transmits the complete SDU or the complete SDU that is assembled into the PDCP layer according to the result of the judgment, and specifically includes:
  • the SDU segment is put into the buffer window according to the receiving sequence, and it is determined whether all the required SDUs for assembling the SDU segment belong to the cache window are stored in the buffer window.
  • SDU segment, in the buffer window stores the most recently received M SDU segments that failed to be assembled into a complete SDU according to the receiving order; when the cache window stores the required SDU for assembling the complete SDU to which the SDU segment belongs
  • M is an integer greater than 0 and less than or equal to the size of the buffer window;
  • the complete SDU included in the RLC PDU is transmitted to the PDCP layer.
  • the processor is further configured to delete the SDU segment used to assemble the complete SDU in the buffer window, and rearrange the remaining SDU segments in the buffer window in the receiving order.
  • the processor is further configured to: when the number of segments in the buffer window is equal to the size of the buffer window, the earliest received SDU segment in the buffer window and the earliest received SDU The other SDU segments belonging to the same complete SDU are deleted, and the remaining SDU segments in the buffer window are rearranged in the order of reception.
  • the processor is further configured to restart a timer when the earliest received SDU segment is updated in the buffer window; when the timer expires, the earliest received N in the buffer window SDU segments and other SDU segments belonging to the same complete SDU as each of the N SDU segments are deleted, and the remaining SDU segments in the buffer window are rearranged in the order of receiving, N is An integer greater than 0 and less than or equal to the size of the buffer window.
  • the processor transmits the complete SDU or the complete SDU that is assembled into the PDCP layer according to the result of the judgment, and specifically includes:
  • the RLC includes the SDU segment
  • the complete SDU included in the RLC PDU is transmitted to the PDCP layer.
  • the processor is further configured to: when the timer expires, discard the SDU segment and the SDU segment that belongs to the same complete SDU as the SDU segment.
  • the processor is further configured to start the timer when the SDU segment is the first received SDU segment of the complete SDU to which the SDU segment belongs.
  • the processor is further configured to: determine whether the timer is running; when the timer is running, restart the timer; when the timer is not running, start the timer .
  • the processor transmits the complete SDU or the complete SDU that is assembled into the PDCP layer according to the result of the judgment, and specifically includes:
  • the RLC PDU includes the SDU segment
  • the complete SDU included in the RLC PDU is transmitted to the PDCP layer.
  • the processor is further configured to: determine whether the timer is running; when the timer is not running, determine that the SDU segment corresponding to the timer is an SDU segment included in the RLC PDU. Segment and start the timer.
  • the processor is further configured to: when the timer expires, discard the SDU segment corresponding to the timer and the SDU segment received earlier than the SDU segment corresponding to the timer .
  • the processor is further configured to: when the timer expires, determine whether there is an SDU segment waiting to be assembled; when there is an SDU segment waiting to be assembled, determine the timer and all waiting The newly received SDU segment in the assembled SDU segment corresponds to and starts the timer.
  • the processor is further configured to: when the timer expires, receive the SDU segment that is later than the corresponding SDU segment, and belong to the same complete segment as the discarded SDU segment. The SDU segment of the SDU is discarded.
  • the beneficial effects of the data transmitting apparatus provided by the seventh aspect and the possible implementation manners of the seventh aspect may refer to the first aspect and the beneficial effects of the possible implementation manners of the first aspect, and Let me repeat.
  • the application provides a sending end, including: a transmitter and a processor;
  • the processor is configured to determine whether a complete service data unit SDU to be sent needs to be segmented, and when the complete SDU does not need to be segmented, the complete SDU is included in a radio link control layer protocol data unit RLC PDU.
  • the RLC header of the RLC PDU does not include the SN of the complete SDU;
  • the transmitter is configured to send the RLC PDU by using a media access control MAC layer, where the RLC PDU is transmitted by using a no-answer mode UM.
  • the application provides a sending end, including: a transmitter and a processor;
  • the processor is configured to determine whether a complete SDU to be sent needs segmentation.
  • the complete SDU is notified as a radio link control layer protocol data unit RLC PDU.
  • the media intervention control MAC layer adds indication information indicating that the RLC PDU does not include an RLC packet header in a MAC header of the MAC PDU; wherein the MAC PDU includes the RLC PDU, and the RLC PDU is transmitted by using a no-answer mode UM;
  • the transmitter is configured to send the RLC PDU through the MAC layer.
  • the beneficial effects of the data transmitting apparatus provided in the ninth aspect may refer to the beneficial effects brought by the foregoing third aspect, and details are not described herein again.
  • the present application provides a receiving end comprising at least one processing element (or chip) for performing the method of the first aspect or the various embodiments of the first aspect described above.
  • the application provides a transmitting end comprising at least one processing element (or chip) for performing the method of the second aspect above.
  • the present application provides a transmitting end comprising at least one processing element (or chip) for performing the method of the above third aspect.
  • the present application provides a readable storage medium, where an executable instruction is stored, and when the at least one processor of the receiving end executes the execution instruction, the receiving end performs the first aspect or the first aspect.
  • Data transmission methods provided by various embodiments.
  • the present application provides a readable storage medium, where an executable instruction is stored, and when at least one processor of the transmitting end executes the execution instruction, the transmitting end executes the data transmission method provided by the second aspect. .
  • the present application provides a readable storage medium, where an executable instruction is stored, and when at least one processor of the transmitting end executes the execution instruction, the transmitting end executes the data transmission method provided by the third aspect. .
  • the application provides a program product, the program product comprising an execution instruction, the execution instruction being stored in a readable storage medium.
  • the at least one processor at the receiving end can read the execution instruction from a readable storage medium, and the at least one processor executes the execution instruction such that the receiving end implements the data transmission method provided by the first aspect or the various embodiments of the first aspect.
  • the application provides a program product, the program product comprising an execution instruction, the execution instruction being stored in a readable storage medium.
  • At least one processor at the transmitting end may read the execution instruction from a readable storage medium, and the at least one processor executes the execution instruction such that the transmitting end implements the data transmission method provided by the second aspect.
  • the application provides a program product, the program product comprising an execution instruction, the execution instruction being stored in a readable storage medium.
  • At least one processor at the transmitting end can read the execution instruction from a readable storage medium, and the at least one processor executes the execution instruction such that the transmitting end implements the data transmission method provided by the third aspect.
  • the present application provides a data transmission system, comprising the data transmission device according to the fifth aspect or the sixth aspect, and the data transmission device according to the fourth aspect or the fourth embodiment.
  • the application provides a data transmission method, including:
  • the transmitting end determines a protocol data unit PDU of the protocol layer, where the PDU includes a format indication field of a PDU of the upper layer of the protocol layer, where the format indication field is used to indicate whether the PDU of the upper layer includes a specific information;
  • the sending end sends the PDU of the protocol layer to the next layer of the protocol layer.
  • the protocol layer is a data convergence protocol layer PDCP or a radio link control RLC layer.
  • the upper layer of the protocol layer is a service data adaptation protocol data unit SDAP.
  • the upper layer of the protocol layer is a PDCP.
  • the specific information is a QoS flow ID.
  • the specific information is a PDU header.
  • the format indication domain may be specifically included in a PDU header of the protocol layer.
  • the specific information is a sequence number SN.
  • the data transmission method provided by the twentieth aspect since specific information does not have to be carried in some transmission scenarios, by including, in the PDU of the protocol layer, whether the upper layer of the protocol layer contains specific information
  • the format indicates the domain, and the length of the specific indication information is usually longer than the length of the format indication field, thereby reducing the transmission overhead.
  • the application provides a data transmission method, including:
  • the receiving end determines the RLC PDU, where the RLC PDU includes at least one format indication field, where the format indication field is used to indicate whether the specified indication area corresponding to the format indication field includes a specific indication domain, and the at least one format indicates the domain
  • the format indication fields corresponds to a designated area
  • the receiving end sends the RLC PDU through a layer of the protocol layer.
  • the specific indication domain comprises: a continuous lost packet SN number indication domain, and/or a SOstart domain, and/or a SOend domain.
  • the RLC PDU includes a format indication field, and the format indication field indicates whether a specific indication domain is included in the designated area corresponding to the format indication domain, and the specific indication domain is not required to be carried.
  • the transmission overhead caused by carrying, thereby reducing the transmission overhead.
  • the application provides a data transmission apparatus, including:
  • a processing module configured to determine a protocol data unit PDU of the protocol layer, where the PDU includes a format indication field of a PDU of the upper layer of the protocol layer, where the format indication field is used to indicate whether the PDU in the upper layer is Contain specific information;
  • a sending module configured to send the PDU of the protocol layer to the next layer of the protocol layer.
  • the protocol layer is a data convergence protocol layer PDCP or a radio link control RLC layer.
  • the upper layer of the protocol layer is a service data adaptation protocol data unit SDAP.
  • the upper layer of the protocol layer is a PDCP.
  • the specific information is a QoS flow ID.
  • the specific information is a PDU header.
  • the format indication domain may be specifically included in a PDU header of the protocol layer.
  • the specific information is a sequence number SN.
  • the application provides a data transmission apparatus, including:
  • a processing module configured to determine an RLC PDU, where the RLC PDU includes at least one format indication field, where the format indication field is used to indicate whether the specified indication area corresponding to the format indication field includes a specific indication domain, and the at least one format indication Each format indication field in the domain corresponds to a designated area;
  • a sending module configured to send the RLC PDU through a layer of the protocol layer.
  • the specific indication domain comprises: a continuous lost packet SN number indication domain, and/or a SOstart domain, and/or a SOend domain.
  • the application provides a sending end, including:
  • a processor configured to determine a protocol data unit PDU of the protocol layer, where the PDU includes a format indication field of a PDU of the upper layer of the protocol layer, where the format indication field is used to indicate whether the PDU in the upper layer is Contain specific information;
  • a transmitter configured to send the PDU of the protocol layer to the next layer of the protocol layer.
  • the protocol layer is a data convergence protocol layer PDCP or a radio link control RLC layer.
  • the upper layer of the protocol layer is a service data adaptation protocol data unit SDAP.
  • the upper layer of the protocol layer is a PDCP.
  • the specific information is a QoS flow ID.
  • the specific information is a PDU header.
  • the format indication domain may be specifically included in a PDU header of the protocol layer.
  • the specific information is a sequence number SN.
  • the application provides a receiving end, including:
  • a processor configured to determine an RLC PDU, where the RLC PDU includes at least one format indication field, where the format indication field is used to indicate whether the specified indication area corresponding to the format indication field includes a specific indication domain, and the at least one format indication Each format indication field in the domain corresponds to a designated area;
  • a transmitter configured to send the RLC PDU through a layer of the protocol layer.
  • the specific indication domain comprises: a continuous lost packet SN number indication domain, and/or a SOstart domain, and/or a SOend domain.
  • the present application provides a transmitting end comprising at least one processing element (or chip) for performing the method of the above twentieth aspect.
  • the present application provides a receiving end comprising at least one processing element (or chip) for performing the method of the above twenty first aspect.
  • the present application provides a readable storage medium, where an executable instruction is stored, and when at least one processor of the receiving end executes the execution instruction, the sending end provides the data provided by the twentieth aspect. Transmission method.
  • the present application provides a readable storage medium, where an execution instruction is stored, and when at least one processor of the transmitting end executes the execution instruction, the receiving end performs the foregoing twenty-first aspect.
  • Data transmission method
  • the application provides a program product, the program product comprising an execution instruction, the execution instruction being stored in a readable storage medium.
  • the at least one processor at the receiving end may read the execution instruction from the readable storage medium, and the at least one processor executes the execution instruction such that the transmitting end implements the data transmission method provided by the twentieth aspect.
  • the application provides a program product, the program product including an execution instruction stored in a readable storage medium.
  • At least one processor at the transmitting end may read the execution instruction from a readable storage medium, and the at least one processor executes the execution instruction such that the receiving end implements the data transmission method provided by the twenty-first aspect.
  • FIG. 1 is a flowchart of a data transmission method according to an embodiment of the present application
  • FIG. 2 is a schematic diagram of a MAC packet header in the prior art
  • FIG. 3 is a flowchart of a data transmission method according to another embodiment of the present application.
  • 4 to 7B are schematic views of a buffer window of the present application.
  • FIG. 8 is a flowchart of a data transmission method according to another embodiment of the present application.
  • FIG. 9 is a flowchart of a data transmission method according to another embodiment of the present disclosure.
  • FIG. 10 is a flowchart of a data transmission method according to another embodiment of the present application.
  • FIG. 11 is a flowchart of a data transmission method according to another embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of a data transmission apparatus according to another embodiment of the present disclosure.
  • FIG. 14 is a schematic structural diagram of a receiving end according to an embodiment of the present disclosure.
  • FIG. 15 is a schematic structural diagram of a sending end according to an embodiment of the present disclosure.
  • 16 is a flowchart of a data transmission method according to another embodiment of the present application.
  • FIG. 17 is a flowchart of a data transmission method according to another embodiment of the present application.
  • FIG. 18 is a schematic structural diagram of a device according to an embodiment of the present disclosure.
  • FIG. 19 is a schematic structural diagram of a device according to another embodiment of the present disclosure.
  • the RLC layer under UM no longer performs reordering and repetitive detection functions, and is reordered and repeatedly detected by the PDCP layer.
  • the present application is mainly applied to user equipment (UE, User Equipment) and base station (gNB) in a 5G network.
  • UE User Equipment
  • gNB base station
  • the UE sends data to the gNB
  • the UE is the transmitting end
  • the gNB is the receiving end
  • the receiving end may specifically be a receiving end RLC entity
  • the sending end may specifically be a sending end RLC entity. It should be noted that the present application is only for the scenario of transmitting data in the RLC layer under UM.
  • FIG. 1 is a flowchart of a data transmission method according to an embodiment of the present application.
  • the data transmission method provided by the embodiment of the present application may be performed by a receiving end.
  • the method in this embodiment may include:
  • Step 101 Receive an RLC Protocol Data Unit (PDU).
  • PDU RLC Protocol Data Unit
  • the RLC PDU is transmitted using UM.
  • the RLC PDU may include a complete Service Data Unit (SDU) or an SDU segment.
  • SDU Service Data Unit
  • the SDU needs to be segmented first in order to adapt to the resource size indicated by the MAC layer.
  • the complete SDU refers to an SDU that is assembled into an RLC PDU without being segmented.
  • An SDU segment refers to an SDU that is assembled into RLC PDUs after segmentation. It should be noted that the SDU in this application is specifically an RLC SDU.
  • Step 102 Determine whether the RLC PDU includes a complete SDU or an SDU segment.
  • the RLC PDU can be judged to be a complete SDU or an SDU segment by the following two methods.
  • the first type can be judged by the FI field in the RLC header of the RLC PDU.
  • the FI field is used to indicate whether a complete SDU is included in the RLC PDU. When the FI field indication does not contain a complete SDU, it may be determined that the RLC PDU contains an SDU segment. Optionally, when the FI field indication includes the complete SDU, the sequence number (SN) of the complete SDU is not included in the RLC header of the RLC PDU.
  • the RLC header of the RLC PDU can be judged by the RLC header of the RLC PDU.
  • the RLC PDU does not contain an RLC header, it is determined that the RLC PDU contains a complete SDU.
  • the PRL PDU includes an RLC header, it is determined that the RLC PDU contains an SDU segment.
  • whether the RLC PDU includes the RLC header may be determined according to the indication information in the MAC header of the MAC PDU that includes the RLC PDU that indicates whether the RLC PDU includes an RLC header.
  • an indication field may be added in an existing MAC header to indicate, or may be indicated by using a reserved bit in an existing MAC header; for example, for the MAC header shown in FIG. 2, Add a new byte between a byte and the second byte, and indicate a bit in the newly added byte as a new indicator field; or use the first byte Any reserved bit (R) is indicated.
  • E in Figure 2 represents an extended field indicating whether more domains exist behind this MAC header.
  • the LCID indicates a logical channel identifier indicating the logical channel to which the RLC PDU belongs or the type of MAC CE or padding.
  • F denotes a format field indicating the size of the length field (L field).
  • L denotes a length field indicating the length of the corresponding RLC PDU or variable-size MAC CE, the unit is Byte bytes, and the number of bits occupied by L may be 7 bits, 15 bits or 16 bits or 17 bits or other sizes.
  • Step 103 According to the result of the judgment, transmit the complete SDU or the complete SDU assembled into the SDU segment to the PDCP layer.
  • the complete SDU included in the RLC PDU is transmitted to the PDCP layer.
  • the complete SDU assembled by the SDU segment may be transmitted to the PDCP layer by using the following three methods.
  • the first one implemented by means of a buffer window. As shown in FIG. 3, the following steps may be specifically included:
  • Step 301 Put the SDU segment included in the RLC PDU into a buffer window according to the receiving sequence.
  • the buffer window stores the most recently received M SDU segments that are not assembled into a complete SDU according to the receiving order, and M is an integer greater than 0 and less than or equal to the size of the buffer window. For example, if the size of the buffer window is 8, and the buffer window is empty, the segments 1, segment 2, segment 3, segment 4, segment 5, segment 6, and minutes are respectively received in sequence. After the 7 SDU segments of segment 7, the SDU segments in the buffer window can be as shown in FIG.
  • Step 302 Determine whether all SDU segments required to assemble the complete SDU to which the SDU segment belongs are stored in the buffer window.
  • step 303 when all the SDU segments required for assembling the complete SDU to which the SDU segment belongs are stored in the buffer window, step 303 is performed. Otherwise, it ends.
  • Step 303 Perform assembly and transmit the assembled complete SDU to the PDCP layer.
  • Step 304 Delete the SDU segment of the buffer window for assembling the complete SDU, and rearrange the remaining SDU segments in the buffer window in the receiving order.
  • the complete SDU has three SDU segments, which are segment 1, segment 2, and segment 4, respectively, and segment 1, segment 2, and segment 4 are deleted.
  • the SDU segments in the buffer window are as shown in FIG. 5.
  • the method further includes: when the number of segments in the buffer window is equal to the size of the buffer window, segmenting the earliest received SDU in the buffer window and segmenting the earliest received SDU The other SDU segments belonging to the same complete SDU are deleted, and the remaining SDU segments in the buffer window are rearranged in the order of reception.
  • SDU segments have been stored in the buffer window before steps 301-303, respectively, which are segment a-segment h, where segment a is The earliest received SDU segment, and segment a, segment c, segment d, and segment f belong to the same complete SDU.
  • segment a and other SDU segments belonging to the same complete SDU as the segment a are deleted, and the remaining SDU segments in the buffer window are rearranged in the order of reception, the SDU segment in the buffer window may be as shown in FIG. 6B. Shown.
  • a timer may further be introduced to clear a useless SDU segment of the buffer window that is unable to form a complete SDU for a long time.
  • the method may include: restarting a timer when the earliest received SDU segment is updated in the buffer window; and when the timer expires, segmenting the N SDU segments received in the buffer window and segmenting the N SDUs
  • Each SDU segment in the SDU belongs to other SDU segments of the same complete SDU, and the remaining SDU segments in the buffer window are rearranged according to the receiving order; wherein N is greater than 0 and less than or equal to the buffer window.
  • the integer of the size is greater than 0 and less than or equal to the buffer window.
  • the timer is restarted.
  • the segment i-segment 1 is sequentially received as shown in Fig. 7A.
  • the segment j, and the segment 1 constitute a complete SDU and report it to the PDCP
  • the SDU segment in the buffer window is as shown in FIG. 7B.
  • the timer is restarted since the earliest received SDU segment in the buffer window is changed from segment b to segment e.
  • the segmentation e in the buffer window and the segmentation e and the buffer window may be segmented when the timer expires.
  • the SDU segments belonging to the same complete SDU are deleted, or the segmentation e in the buffer window, the segment g, the SDU segment belonging to the same complete SDU as the segment e, and the same complete SDU as the segment g
  • the SDU segment is deleted.
  • the size of the buffer window may be configured through a network, and the configuration may be configured by using Radio Resource Control (RRC) signaling.
  • RRC Radio Resource Control
  • the size of P may be fixed, or the network may be configured through RRC signaling.
  • the second method is implemented by using a complete SDU corresponding to a timer. As shown in FIG. 8, specifically, the following steps may be included:
  • Step 801 During the running of the timer, determine whether all SDU segments required to assemble the complete SDU to which the SDU segment belongs are received.
  • step 802 when all the SDU segments required to assemble the complete SDU to which the SDU segment belongs are received, step 802 is performed.
  • step 803 is performed.
  • the timer corresponds to the complete SDU to which the SDU segment belongs, that is, a complete SDU corresponds to a timer.
  • the correspondence between the complete SDU and the timer may be dynamically allocated or statically allocated, and is not limited herein.
  • only the SDU segment included in the RLC PDU may be the first of the complete SDU to which the SDU segment belongs.
  • any SDU segment of the complete SDU to which the SDU segment belongs may be received.
  • the timer corresponding to the complete SDU to which the segment of the SDU belongs is restarted.
  • the method may include: determining whether the SDU segment included in the RLC PDU is the first received SDU segment of the complete SDU to which the SDU segment belongs; when the SDU segment included in the RLC PDU is When the first SDU segment of the complete SDU to which the SDU segment belongs, the timer corresponding to the complete SDU segment to which the SDU segment belongs is started, and after the startup, step 801 is performed; when the RLC is performed When the SDU segment included in the PDU is not the first received SDU segment of the complete SDU to which the SDU segment belongs, step 801 is performed.
  • the method may include: determining whether a timer corresponding to the complete SDU to which the SDU segment belongs is running; when running, restarting the timer, and performing step 801 after restarting; when not running, The timer is started and step 801 is executed after startup.
  • Step 802 Perform assembly, and transmit the assembled complete SDU to the PDCP layer, and stop the timer.
  • all SDU segments required to assemble the complete SDU to which the SDU segment belongs are assembled, and the assembled complete SDU is transmitted to the PDCP layer.
  • the timer can be stopped after determining that the SDU segment can be assembled into a complete SDU with other SDU segments.
  • Step 803 When the timer expires, discard the SDU segment and the SDU segment that belongs to the same complete SDU as the SDU segment.
  • the timer When the timer expires, it indicates that the complete SDU cannot be assembled within the time range specified by the timer, and therefore the SDU segment and the SDU segment belonging to the same complete SDU as the SDU segment are discarded.
  • the timer corresponding to the complete SDU to which the SDU segment belongs is started.
  • the complete SDU1 has 4 SDU segments, which are Segment 1, Segment 2, Segment 3, and Segment 4, respectively, and the first SDU of the complete SDU1 is received.
  • the segment is segment 1.
  • timer 1 is started.
  • segment 1 - segment 4 is assembled into a complete SDU1 transmission to PDCP, and timer 1 is stopped;
  • timer 1 is stopped;
  • segment 2 and segment 3 are received during the running of the timer 1, it indicates that all the SDU segments of the complete SDU1 are not received within the time range specified by the timer 1, so when the timer 1 times out, Discard Segment 1, Segment 2, and Segment 3.
  • the timer corresponding to the complete SDU to which the segment of the SDU belongs is restarted. Assuming that Timer 1 corresponds to the complete SDU1, the complete SDU1 has 4 SDU segments, which are Segment 1, Segment 2, Segment 3, and Segment 4, respectively, and the first SDU of the complete SDU1 is received.
  • the segment is segment 1.
  • the third type is implemented by adopting a method in which all SDU segments correspond to one timer. As shown in FIG. 9, specifically, the following steps may be included:
  • Step 901 During the running of the timer, determine whether all SDU segments required to assemble the complete SDU to which the SDU segment belongs are received.
  • step 902 when all the SDU segments required to assemble the complete SDU to which the SDU segment belongs are received, step 902 is performed. When all the SDU segments required to assemble the complete SDU to which the SDU segment belongs are not received, step 903 is performed.
  • This timer corresponds to the SDU segment.
  • the SDU segment corresponding to the timer may be an SDU segment included in the RLC PDU, or may be an SDU segment received before the SDU segment included in the RLC PDU.
  • Step 902 assembling, and transmitting the assembled complete SDU to the PDCP layer.
  • Step 903 When the timer expires, discard the SDU segment corresponding to the timer and the SDU segment received earlier than the SDU segment corresponding to the timer.
  • the purpose of setting the timer is to limit the duration of the SDU segment corresponding to the timer and the SDU segment received before the SDU segment corresponding to the timer.
  • the SDU segment corresponding to the timer and the SDU segment received earlier than the SDU segment corresponding to the timer are too long to wait for assembly. Therefore, the SDU corresponding to the timer needs to be divided. The segment and the SDU segment received earlier than the SDU segment corresponding to the timer are discarded.
  • the trigger condition 1 for starting the timer may be: determining whether the timer is running when the RLC PDU is received; determining that the SDU segment corresponding to the timer is the RLC when the timer is not running.
  • the PDU contains the SDU segment and starts the timer.
  • the trigger condition 2 for starting the timer may be: when the timer expires, it is determined whether there is an SDU segment waiting to be assembled; when there is an SDU segment waiting to be assembled, determining the timer and all SDU segments waiting to be assembled The latest received SDU segment corresponds to and starts the timer. It should be noted that in the actual application, only the trigger condition 1 may be used, or the trigger condition 1 and the trigger condition 2 may be used at the same time.
  • the trigger condition 1 Only the trigger condition 1 is used.
  • the SDU segment waiting for assembly waits too long, and the cache time is too long.
  • the time that the segment 4 and the segment 5 wait for assembly is too long, and the cache time is too long. Based on this, the method of triggering condition 2 can be further adopted.
  • step 903 After the timer expires in step 903, the SDU segment corresponding to the timer and the SDU segment received earlier than the SDU segment corresponding to the timer are discarded, and the SDU segment corresponding to the timer is later. It is meaningless to receive an SDU segment that belongs to the same complete SDU as the discarded SDU segment. Therefore, when the timer expires, the SDU segment that is received later than the SDU segment corresponding to the timer may be discarded, and the SDU segment that belongs to the same complete SDU is discarded with the discarded SDU segment to save cache space.
  • the step 903 may further include: optionally, when the timer expires, the SDU segment corresponding to the timer is received later, and the SDU segment corresponding to the timer belongs to the same complete
  • the SDU segment of the SDU is discarded, and is received later than the SDU segment corresponding to the timer, and is discarded by the SDU segment of the same SDU segment with each SDU segment of the K SDU segments;
  • the K SDU segments are SDU segments received earlier than the SDU segment corresponding to the timer, and K is an integer greater than or equal to 0.
  • the complete SDU assembled by the SDU segment is transmitted to the PDCP layer in a manner that all SDU segments correspond to the same timer, and the SDU segment corresponding to the timer is ensured and the timer is earlier than the timer.
  • the SDU segment received by the corresponding SDU segment will not stay in the buffer for a long time, occupying the buffer.
  • the data transmission method provided by the embodiment of the present application determines whether the RLC PDU includes a complete SDU or an SDU segment by using the receiving end, and transmits the complete SDU or the complete SDU assembled into the SDU segment to the PDCP layer according to the result of the judgment. Data reception of the RLC layer under UM in 5G is realized. In addition, since the receiving end directly transmits the complete SDU to the PDCP layer, the processing delay caused by the RLC layer waiting for reordering is avoided.
  • FIG. 10 is a flowchart of a data transmission method according to another embodiment of the present application.
  • the data transmission method provided by the embodiment of the present application may be performed by a transmitting end. As shown in FIG. 10, the method in this embodiment may include:
  • Step 1001 Determine whether a complete SDU to be sent needs segmentation.
  • step 1002 when it is determined that the complete SDU to be sent needs to be segmented, step 1002 is performed.
  • step 1003 is performed. Specifically, whether the complete SDU to be sent needs to be segmented may be determined according to the size of the RLC PDU that can be transmitted indicated in the transmission opportunity notified by the MAC layer.
  • Step 1002 Segment the complete SDU, include the SDU segment of the complete SDU in the RLC PDU, and send the RLC PDU through the MAC layer.
  • the RLC header of the RLC PDU includes a sequence number (SN) of the complete SDU.
  • the RLC PDU is transmitted using UM.
  • Step 1003 Include the complete SDU in the RLC PDU, and send the RLC PDU through the MAC layer.
  • the RLC header of the RLC PDU does not include the SN of the complete SDU, and the RLC PDU is transmitted by using the UM.
  • the SN is used to identify the transmission sequence number of the RLC PDU on the transmitting end, which is convenient for the receiving end to perform reordering and repeated detection, that is, if the sending sequence number is small, the representative first transmits, and the receiving end RLC layer If it needs to be delivered in order, it needs to be reordered according to the SN and then submitted to the PDCP layer. In addition, if the packet with the same serial number is received, it is necessary to discard one and then submit.
  • the RLC layer at the receiving end does not need to perform reordering and repeated detection.
  • the RLC layer receives the complete SDU and directly submits it to the PDCP layer, so the SN is no longer needed.
  • the SDU segment it needs to be assembled into a complete SDU before the submission, and it needs to identify which SDU segments belong to the same complete SDU, so the SN identifier is still needed.
  • the data transmission method when the transmitting end does not need to segment the complete SDU to be sent, the complete SDU is included in the RLC PDU, and the RLC PDU is sent out through the MAC layer, and The RLC header of the RLC PDU does not include the SN of the complete SDU, and implements data transmission of the RLC layer under the UM in the 5G.
  • the RL of the complete SDU is not included in the RLC header of the RLC PDU containing the complete SDU, the transmission overhead can be saved.
  • FIG. 11 is a flowchart of a data transmission method according to another embodiment of the present application.
  • the data transmission method provided by the embodiment of the present application may be performed by a transmitting end. As shown in FIG. 11, the method in this embodiment may include:
  • Step 1101 Determine whether a complete SDU to be sent needs segmentation.
  • step 1102 when it is determined that the complete SDU to be sent needs to be segmented, step 1102 is performed.
  • step 1103 is performed. Specifically, whether the complete SDU to be sent needs to be segmented may be determined according to the size of the RLC PDU that can be transmitted indicated in the transmission opportunity notified by the MAC layer.
  • Step 1102 Segment the complete SDU, include the SDU segment of the complete SDU in the RLC PDU, and send the RLC PDU through the MAC layer.
  • the RLC header of the RLC PDU may include a sequence number (SN) of the complete SDU.
  • the RLC PDU is transmitted using UM.
  • Step 1103 The complete SDU is used as an RLC PDU.
  • the main purpose of the RLC packet header is to carry the SN.
  • the RLC packet header does not need to carry the SN. Therefore, the complete SDU may not include the RLC packet header, and thus the complete SDU may be used as the RLC PDU.
  • Step 1104 The MAC layer is notified to add, in the MAC header of the MAC PDU, indication information indicating that the RLC PDU does not include the RLC header, and send the RLC PDU through the MAC layer.
  • the MAC PDU includes the RLC PDU, and the RLC PDU is transmitted using the no answer mode UM.
  • the data transmission method when the sender determines that the complete SDU to be sent does not need to be segmented, the complete SDU is used as the RLC PDU, and the MAC layer is notified to add the indication in the MAC header of the MAC PDU.
  • the RLC PDU does not include the indication information of the RLC header, and the RLC PDU is sent out through the MAC layer to implement data transmission of the RLC layer under the UM in the 5G.
  • the transmission overhead can be saved.
  • FIG. 12 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present application.
  • the apparatus provided in this embodiment may be implemented as part or all of the receiving end by software, hardware or a combination of both.
  • the apparatus may include: a receiving module 1201, configured to receive a radio link control layer protocol data unit RLC PDU; and a processing module 1202, configured to determine that the RLC PDU received by the receiving module 1201 includes a complete service.
  • the data unit SDU is also an SDU segment, and according to the result of the judgment, transmits the complete SDU or the complete SDU assembled into the SDU segment to the packet data convergence protocol PDCP layer, and the RLC PDU is performed by using the no-answer mode UM. transmission.
  • the processing module 1202 determines whether the received RLC PDU includes a complete service data unit SDU or an SDU segment, and specifically includes: determining whether the RLC PDU includes an RLC header; and when the RLC PDU does not include the RLC In the case of a packet header, it is determined that the RLC PDU includes a complete SDU; when the RLC PDU includes an RLC packet header, it is determined that the RLC PDU includes an SDU segment.
  • the processing module 1202 determines whether the RLC PDU includes an RLC packet header, and specifically includes: determining, according to the indication information in the MAC packet header of the media access control MAC PDU, whether the RLC PDU includes an RLC packet header, determining the RLC. Whether the PDU includes an RLC header; wherein the MAC PDU includes the RLC PDU.
  • the sequence number SN of the complete SDU is not included in the RLC header of the RLC PDU.
  • the processing module 1202 may specifically implement the function of transmitting the complete SDU or the complete SDU assembled by the SDU segment to the PDCP layer of the packet data convergence protocol according to the result of the determining.
  • the processing module 1202 transmits the complete SDU or the complete SDU that is assembled into the SDU segment to the packet data convergence protocol PDCP layer, and specifically includes:
  • the SDU segment is put into the buffer window according to the receiving sequence, and it is determined whether the complete SDU to which the SDU segment belongs is stored in the cache window. All SDU segments required, when the cache window stores all the SDU segments required to assemble the complete SDU to which the SDU segment belongs, assembles and transmits the assembled complete SDU to the a PDCP layer, wherein the buffer window stores, in the receiving order, the most recently received M SDU segments M that fail to be assembled into a complete SDU are integers greater than 0 and less than or equal to the size of the buffer window;
  • the complete SDU included in the RLC PDU is transmitted to the PDCP layer.
  • the processing module 1202 is further configured to delete the SDU segments in the buffer window for assembling the complete SDU, and rearrange the remaining SDU segments in the buffer window in the receiving order.
  • the processing module 1202 is further configured to: when the number of segments in the buffer window is equal to the size of the buffer window, divide the earliest received SDU segment in the buffer window and the earliest received SDU The other SDU segments belonging to the same complete SDU are deleted, and the remaining SDU segments in the buffer window are rearranged in the order of reception.
  • the processing module 1202 is further configured to: when the earliest received SDU segment in the buffer window is updated, restarting a timer; when the timer expires, the N most received in the buffer window.
  • N An integer greater than 0 and less than or equal to the size of the buffer window.
  • the processing module 1202 transmits the complete SDU or the complete SDU that is assembled into the SDU segment to the packet data convergence protocol PDCP layer, and specifically includes:
  • the RLC includes an SDU segment
  • the assembled complete SDU is transmitted to the PDCP layer, and the timer is stopped; wherein the timer is The complete SDU corresponding to the SDU segment corresponds to;
  • the complete SDU included in the RLC PDU is transmitted to the PDCP layer.
  • processing module 1202 is further configured to: when the timer expires, discard the SDU segment and the SDU segment that belongs to the same complete SDU as the SDU segment.
  • the processing module 1202 is further configured to start the timer when the SDU segment is the first received SDU segment of the complete SDU to which the SDU segment belongs.
  • the processing module 1202 is further configured to: determine whether the timer is running; when the timer is running, restart the timer; when the timer is not running, start the timer .
  • the processing module 1202 transmits the complete SDU or the complete SDU that is assembled into the SDU segment to the packet data convergence protocol PDCP layer, and specifically includes:
  • the RLC PDU includes an SDU segment
  • the assembled complete SDU is transmitted to the PDCP layer; wherein the timer corresponds to the SDU segment;
  • the complete SDU included in the RLC PDU is transmitted to the PDCP layer.
  • the processing module 1202 is further configured to: determine whether the timer is running; when the timer is not running, determine that the SDU segment corresponding to the timer is an SDU segment included in the RLC PDU. Segment and start the timer.
  • the processing module 1202 is further configured to: when the timer expires, discard the SDU segment corresponding to the timer and the SDU segment received earlier than the SDU segment corresponding to the timer.
  • the processing module 1202 is further configured to: when the timer expires, determine whether there is an SDU segment waiting to be assembled; when there is an SDU segment waiting to be assembled, determine the timer and all SDUs waiting to be assembled. The newly received SDU segment in the segment corresponds to and starts the timer.
  • the processing module 1202 is further configured to: when the timer expires, receive the SDU that is later than the SDU segment corresponding to the timer, and belongs to the same complete SDU as the discarded SDU segment. Segmentation is discarded.
  • the data transmission device provided in this embodiment may be used to implement the technical solution of any one of the foregoing method embodiments shown in FIG. 1 , FIG. 3 , FIG. 8 and FIG. 9 , and the implementation principle and technical effects thereof are The method embodiment is similar and will not be described here.
  • FIG. 13 is a schematic structural diagram of a data transmission apparatus according to another embodiment of the present disclosure.
  • the apparatus provided in this embodiment may be implemented as part or all of the transmitting end by software, hardware or a combination of both.
  • the apparatus may include: a processing module 1301, configured to determine whether a complete service data unit SDU to be sent needs to be segmented, and when it is determined that the complete SDU does not need to be segmented, the complete The SDU is included in the radio link control layer protocol data unit RLC PDU, where the RLC header of the RLC PDU does not include the SN of the complete SDU, and the sending module 1302 is configured to pass the RLC PDU obtained by the processing module 1301.
  • the media access control MAC layer sends out, and the RLC PDU is transmitted using the no answer mode UM.
  • the present application further provides a data transmission system, including: the data transmission device provided in this embodiment, and the data transmission device provided in the foregoing embodiment shown in FIG.
  • the data transmission device provided in this embodiment may be used to perform the technical solution of the foregoing method embodiment shown in FIG. 10, and the implementation principle and the technical effect are similar to the method embodiment, and details are not described herein again.
  • the present application can also provide a data transmission device, which can be implemented as part or all of the transmitting end by software, hardware or a combination of both.
  • the device has the same structure as the device shown in FIG. 13, and may also include a processing module and a transmitting module.
  • the processing module is configured to determine whether a complete SDU to be sent needs segmentation. When the complete service data unit SDU does not need to be segmented, the complete SDU is used as a radio link control layer protocol data unit RLC.
  • a sending module configured to notify the media intervention control MAC layer to add indication information indicating that the RLC PDU does not include an RLC header in a MAC header of the MAC PDU, and send the RLC PDU through the MAC layer,
  • the MAC PDU includes the RLC PDU, and the RLC PDU is transmitted using a no answer mode UM.
  • the present application further provides a data transmission system, including: the data transmission device provided in this embodiment, and the data transmission device provided in the foregoing embodiment shown in FIG.
  • the data transmission device provided in this embodiment may be used to perform the technical solution of the foregoing method embodiment shown in FIG. 11.
  • the implementation principle and the technical effect are similar to the method embodiment, and details are not described herein again.
  • FIG. 14 is a schematic structural diagram of a receiving end according to an embodiment of the present disclosure, where the receiving end is, for example, a UE or a gNB.
  • the receiving end may include a processor 1401, a memory 1402, a receiver 1403, and at least one communication bus 1404.
  • Communication bus 1404 is used to implement a communication connection between components.
  • Memory 1402 may include high speed RAM memory, and may also include non-volatile memory NVM, such as at least one disk memory, in which various programs may be stored for performing various processing functions and implementing the method steps of the present embodiments.
  • the receiver 1403 in this embodiment may be a corresponding input interface having a communication function and a receiving information function, and may also be a radio frequency module or a baseband module on the receiving end.
  • the receiver 1403 is configured to receive a radio link control layer protocol data unit RLC PDU;
  • the processor 1401 is configured to determine whether the RLC PDU includes a complete service data unit SDU or an SDU segment, and according to the result of the determining, transmit the complete SDU or the complete SDU assembled into the SDU segment to the packet data. Convergence Protocol PDCP layer, the RLC PDU is transmitted using the no answer mode UM.
  • the processor 1401 determines whether the RLC PDU includes a complete SDU or an SDU segment, and specifically includes: determining whether the RLC header is included in the RLC PDU; and determining, when the RLC PDU does not include an RLC packet header, The RLC PDU includes a complete SDU; when the RLC PDU includes an RLC header, it is determined that the RLC PDU includes an SDU segment.
  • the processor 1401 determines whether the RLC PDU includes an RLC packet header, and specifically includes: determining, according to the indication information in the MAC packet header of the media access control MAC PDU, whether the RLC PDU includes an RLC packet header, determining the RLC. Whether the PDU includes an RLC header; wherein the MAC PDU includes the RLC PDU.
  • the sequence number SN of the complete SDU is not included in the RLC header of the RLC PDU.
  • the functions performed by the processor 1401 may be specifically classified into the following three types.
  • the processor 1401 transmits, according to the result of the judgment, the complete SDU or the complete SDU that is assembled into the PDCP layer by the SDU, specifically including:
  • the SDU segment is put into the buffer window according to the receiving sequence, and it is determined whether the complete SDU to which the SDU segment belongs is stored in the cache window. All SDU segments required, in the buffer window, storing the most recently received M SDU segments that failed to be assembled into a complete SDU according to the receiving order; when the cache window stores the assembly of the SDU segments When all SDU segments required for the complete SDU are assembled, the assembled complete SDU is transmitted to the PDCP layer, and M is an integer greater than 0 and less than or equal to the size of the buffer window;
  • the complete SDU included in the RLC PDU is transmitted to the PDCP layer.
  • the processor 1401 is further configured to delete the SDU segments in the buffer window for assembling the complete SDU, and rearrange the remaining SDU segments in the buffer window in the receiving order.
  • the processor 1401 is further configured to: when the number of segments in the buffer window is equal to the size of the buffer window, divide the earliest received SDU segment in the buffer window and the earliest received SDU The other SDU segments belonging to the same complete SDU are deleted, and the remaining SDU segments in the buffer window are rearranged in the order of reception.
  • the processor 1401 is further configured to: when the SDU segment received in the buffer window is updated, restart the timer; when the timer expires, the N SDUs received in the buffer window are received first. Segmentation and other SDU segments belonging to the same complete SDU as each of the N SDU segments are deleted, and the remaining SDU segments in the buffer window are rearranged in the order of reception, N is An integer greater than 0 and less than or equal to the size of the buffer window.
  • the processor 1401 transmits, according to the result of the judgment, the complete SDU or the complete SDU that is assembled into the PDCP layer by the SDU, specifically including:
  • the RLC includes an SDU segment
  • the complete SDU included in the RLC PDU is transmitted to the PDCP layer.
  • the processor 1401 is further configured to: when the timer expires, discard the SDU segment and the SDU segment that belongs to the same complete SDU as the SDU segment.
  • the processor 1401 is further configured to start the timer when the SDU segment is the first received SDU segment of the complete SDU to which the SDU segment belongs.
  • the processor 1401 is further configured to: determine whether the timer is running; restart the timer when the timer is running; and start the timer when the timer is not running. .
  • the third type is the third type.
  • the processor 1401 transmits, according to the result of the judgment, the complete SDU or the complete SDU that is assembled into the PDCP layer by the SDU, specifically including:
  • the RLC PDU includes an SDU segment
  • the complete SDU included in the RLC PDU is transmitted to the PDCP layer.
  • the processor 1401 is further configured to: determine whether the timer is running; when the timer is not running, determine that the SDU segment corresponding to the timer is an SDU segment included in the RLC PDU. And start the timer.
  • the processor 1401 is further configured to: when the timer expires, discard the SDU segment corresponding to the timer and the SDU segment received earlier than the SDU segment corresponding to the timer.
  • processor 1401 is further configured to:
  • the timer corresponds to the most recently received SDU segment among all the SDU segments waiting to be assembled, and the timer is started.
  • the processor 1401 is further configured to: when the timer expires, receive the SDU that is later than the SDU segment corresponding to the timer, and belongs to the same complete SDU as the discarded SDU segment. Segmentation is discarded.
  • the receiving end provided in this embodiment may be used to implement the technical solution of any one of the foregoing method embodiments shown in FIG. 1 , FIG. 3 , FIG. 8 and FIG. 9 , the implementation principle, the technical effect and the method implementation.
  • the examples are similar and will not be described here.
  • FIG. 15 is a schematic structural diagram of a sending end according to an embodiment of the present disclosure, where the sending end is, for example, a UE or a gNB.
  • the receiving end may include a processor 1501, a memory 1502, a transmitter 1503, and at least one communication bus 1504.
  • Communication bus 1504 is used to implement a communication connection between components.
  • Memory 1502 may include high speed RAM memory, and may also include non-volatile memory NVM, such as at least one disk memory, in which various programs may be stored for performing various processing functions and implementing the method steps of the present embodiments.
  • the transmitter 1503 in this embodiment may be a corresponding output interface having a communication function and a receiving information function, and may also be a radio frequency module or a baseband module on the receiving end.
  • the processor 1501 is configured to determine whether a complete service data unit SDU to be sent needs to be segmented, and when the complete SDU does not need to be segmented, the complete SDU is included in the radio link control.
  • the layer protocol data unit RLC PDU, the RLC header of the RLC PDU does not include the SN of the complete SDU;
  • the transmitter 1503 is configured to send the RLC PDU by using a media access control MAC layer, where the RLC PDU is transmitted by using a no-answer mode UM.
  • the transmitting end provided in this embodiment may be used to perform the technical solution of the method embodiment shown in FIG. 10, and the implementation principle and the technical effect are similar to the method embodiment, and details are not described herein again.
  • the application may also provide a sender, which may be, for example, a UE or a gNB.
  • the transmitting end has the same structure as the transmitting end shown in FIG.
  • the processor is configured to determine whether a complete SDU to be sent needs segmentation.
  • the complete SDU is used as a radio link control layer protocol data unit RLC.
  • PDU informing the media intervention control MAC layer to add indication information indicating that the RLC PDU does not include an RLC header in a MAC header of the MAC PDU; wherein the MAC PDU includes the RLC PDU, and the RLC PDU uses no response
  • the mode UM performs transmission; the transmitter is configured to send the RLC PDU through the MAC layer.
  • the transmitting end provided in this embodiment may be used to perform the technical solution of any of the foregoing method embodiments, and the implementation principle and the technical effect are similar to the method embodiments, and details are not described herein again.
  • the present application also provides a readable storage medium.
  • the readable storage medium stores instructions. When at least one processor at the receiving end executes the instruction, the receiving end performs the operations shown in FIG. 1, FIG. 3, FIG. 8 and FIG. A data transmission method provided by any one of the method embodiments.
  • the present application further provides a readable storage medium.
  • the readable storage medium stores instructions. When at least one processor of the transmitting end executes the instruction, the transmitting end executes the data transmission method provided in the foregoing method embodiment shown in FIG.
  • the present application further provides a readable storage medium.
  • the readable storage medium stores instructions. When at least one processor at the transmitting end executes the instruction, the transmitting end executes the data transmission method provided in the foregoing method embodiment shown in FIG.
  • the application also provides a program product comprising instructions stored in a readable storage medium.
  • the at least one processor at the receiving end can read the instruction from the readable storage medium, and execute the instruction to enable the receiving end to implement the method embodiment provided by any of the method embodiments shown in FIG. 1, FIG. 3, FIG. 8 and FIG. Data transfer method.
  • the application also provides a program product comprising instructions stored in a readable storage medium.
  • the at least one processor on the transmitting end can read the instruction from the readable storage medium and execute the instruction to cause the transmitting end to implement the data transmission method provided by the method embodiment shown in FIG. 10 above.
  • the application also provides a program product comprising instructions stored in a readable storage medium.
  • the at least one processor on the transmitting end can read the instruction from the readable storage medium and execute the instruction to cause the transmitting end to implement the data transmission method provided by the method embodiment shown in FIG. 11 above.
  • the present application further provides a data transmission method, which may be performed by a transmitting end, and the transmitting end may be, for example, a UE or a gNB.
  • the method includes:
  • Step 1601 Determine a protocol data unit PDU of the protocol layer, where the PDU includes a format indication field of a PDU of a layer above the protocol layer.
  • the format indication field is used to indicate whether specific information is included in the PDU of the upper layer.
  • the protocol layer may be a data convergence protocol layer PDCP or a radio link control RLC layer.
  • the upper layer of the protocol layer is a service data adaptation protocol data unit SDAP; when the protocol layer is an RLC, the upper layer of the protocol layer is a PDCP.
  • the specific information may be a QoS flow ID.
  • the QoS flow ID is used to identify the QoS flow to which the SDAP PDU belongs, and is used for identifying by the UE or the gNB. For example, when the format indication field value is 1, it may indicate that the QoS flow ID is included in the SDAP PDU; when the format indication field value is 0, it may indicate that the QoS flow ID is not included in the SDAP PDU.
  • the specific information may also be a PDU header.
  • the format indication field value is 1, it may indicate that the SDAP PDU includes a PDU header; when the format indication field value is 0, it may indicate that the SDAP PDU does not include a PDU header.
  • the format indication domain may be specifically included in a PDU header of the protocol layer.
  • the specific information may be a sequence number SN.
  • Step 1602 Send the PDU of the protocol layer to the next layer of the protocol layer.
  • the data transmission method provided by the embodiment of the present application because specific information does not have to be carried in some transmission scenarios, includes a format for indicating whether the upper layer of the protocol layer contains specific information in the PDU of the protocol layer.
  • the domain is indicated, and the length of the specific indication information is usually longer than the length of the format indication field, thereby reducing the transmission overhead.
  • the present application further provides a data transmission method, which may be performed by a receiving end, and the receiving end may be, for example, a UE or a gNB.
  • the method includes:
  • Step 1701 Determine an RLC PDU, where the RLC PDU includes at least one format indication field.
  • the format indication field is used to indicate whether a specific indication domain is included in a specified area corresponding to the format indication field. Each of the at least one format indication domain corresponds to a designated area.
  • the specific indication field includes: a lost packet SN number indication field, and/or a continuous lost packet SN number indication field, and/or a SOstart domain, and/or a SOend domain.
  • the lost packet SN number indication field is used to indicate the SN number of the lost RLC PDU
  • the consecutive lost packet SN number indication field is used to indicate the number of consecutive lost RLC PDUs.
  • the SOend field is used to indicate the location of the last byte of the SDU segment in the complete SDU.
  • the SOstart field is used to indicate the location of the first byte of the SDU segment in the complete SDU.
  • the transmitting end After the transmitting end sends a set of RLC PDUs to the receiving end, when the receiving end does not receive one or more RLC PDUs, the RLC PDU indicating that the SDUs corresponding to the SN numbers are not successfully received needs to be sent to the sending end.
  • the RLC PDU sent by the receiving end includes all the SNs of the unsuccessfully received SDUs, and specifically, the SDU segments corresponding to the SDUs are not included in the SDU segment. And the SOend domain.
  • the specific indication domain includes the consecutive lost packet SN number indication domain, so that the number of SNs included in the RLC PDU can be reduced, for example, 10 SDUs whose SN is SN1-SN10 are not successfully received, and the prior art
  • the medium RLC PDU needs to include SN1, SN2, ..., SN10, and the present application only needs to include SN1 and a continuous lost packet SN number indication field with a value of 10.
  • only the start SN (for example, SN1) of the lost SDU needs to be included, and the SN number indication field of the continuous lost packet is not required to be included in the present application. Whether the continuous lost packet SN number indication field is included in the designated area can further reduce the transmission overhead.
  • the SOstart domain and the SOend domain need to be simultaneously indicated for the SDU segment.
  • the SDU segment is the first segment of a complete SDU or the SDU segment is the last segment of a complete SDU.
  • the transmission overhead can be further reduced by specifying whether the format indication field is used to indicate whether the SOstart domain, and/or the SOend domain are included in the designated area corresponding to the format indication domain.
  • the value of the format indication field when the value of the format indication field is “00”, it may be indicated that the designated area corresponding to the format indication field does not include the SOstart domain and the SOend domain.
  • the value of the format indication field is “01”, it may indicate that the specified area corresponding to the format indication field includes a SOstart domain but does not include a SOend domain, and when the consecutive lost packet SN number indicates that the domain exists, the SOstart domain Corresponding to the first packet indicated by the consecutive lost packet SN number indication field.
  • the specified area corresponding to the format indication field does not include the SOstart domain but includes the SOend domain, and when the consecutive lost packet SN number indicates that the domain exists, the SOend domain corresponds to The consecutive lost packet SN number indicates the last packet indicated by the field.
  • the value of the format indication field is "11" it may be indicated that the specified area corresponding to the format indication field includes both the SOstart domain and the SOend domain, and when the consecutive lost packet SN number indicates that the domain exists, the SOstart domain corresponds to consecutive The lost packet SN number indicates the first packet indicated by the domain, and the SOend field corresponds to the last packet indicated by the consecutive lost packet SN number indication field. It is worth noting that the binding relationship between the value of the indication field and the indication content is not limited here, as long as the indication domain is a different value, the meaning of the indication is different.
  • Step 1702 Send the RLC PDU to the next layer of the protocol layer.
  • the data transmission method provided by the embodiment of the present application includes a format indication field by using the RLC PDU, and the format indication field indicates whether a specific indication domain is included in the designated area corresponding to the format indication domain, and the specific indication domain is not required to be carried.
  • the transmission overhead caused by carrying, thereby reducing the transmission overhead.
  • the present application can also provide a data transmission device, which can be implemented as part or all of the transmitting end by software, hardware or a combination of both.
  • the device has the same structure as the device shown in FIG. 13, and may also include a processing module and a transmitting module.
  • the processing module is configured to determine a protocol data unit PDU of the protocol layer, where the PDU includes a format indication field of a PDU of a layer of the protocol layer, where the format indication field is used to indicate the PDU of the upper layer. Whether the specific information is included in the sending module, and the sending module is configured to send the PDU of the protocol layer to the next layer of the protocol layer.
  • the protocol layer is a data convergence protocol layer PDCP or a radio link control RLC layer.
  • the upper layer of the protocol layer is a service data adaptation protocol data unit SDAP.
  • the upper layer of the protocol layer is a PDCP.
  • the specific information is a QoS flow ID.
  • the specific information is a PDU header.
  • the format indication domain may be specifically included in a PDU header of the protocol layer.
  • the specific information is a sequence number SN.
  • the data transmission device provided in this embodiment may be used to perform the foregoing technical solution of the method embodiment shown in FIG. 16.
  • the implementation principle and the technical effect are similar to the method embodiment, and details are not described herein again.
  • the present application can also provide a data transmission device, which can be implemented as part or all of the receiving end by software, hardware or a combination of both.
  • the device has the same structure as the device shown in FIG. 13, and may also include a processing module and a transmitting module.
  • the processing module is configured to determine an RLC PDU, where the RLC PDU includes at least one format indication field, where the format indication field is used to indicate whether the specified indication area corresponding to the format indication field includes a specific indication domain, and the at least one Each format indication field in the format indication field corresponds to a designated area;
  • a sending module configured to send the RLC PDU through a layer of the protocol layer.
  • the specific indication domain includes: a continuous lost packet SN number indication domain, and/or a SOstart domain, and/or a SOend domain.
  • the data transmission device provided in this embodiment may be used to perform the foregoing technical solution of the method embodiment shown in FIG. 17.
  • the implementation principle and the technical effect are similar to the method embodiment, and details are not described herein again.
  • the application may also provide a sender, which may be, for example, a UE or a gNB.
  • the transmitting end of this embodiment has the same structure as the transmitting end shown in FIG. 15, and may also include a processor, a memory, a transmitter, and at least one communication bus.
  • the processor is configured to determine a protocol data unit PDU of the protocol layer, where the PDU includes a format indication field of a PDU of the upper layer of the protocol layer, where the format indication field is used to indicate the PDU of the upper layer. Whether the specific information is included in the sender; the transmitter is configured to send the PDU of the protocol layer through the next layer of the protocol layer.
  • the protocol layer is a data convergence protocol layer PDCP or a radio link control RLC layer.
  • the upper layer of the protocol layer is a service data adaptation protocol data unit SDAP.
  • the upper layer of the protocol layer is a PDCP.
  • the specific information is a QoS flow ID.
  • the specific information is a PDU header.
  • the format indication domain may be specifically included in a PDU header of the protocol layer.
  • the specific information is a sequence number SN.
  • the transmitting end provided in this embodiment may be used to perform the technical solution of the foregoing method embodiment shown in FIG. 16.
  • the implementation principle and the technical effect are similar to the method embodiment, and are not described herein again.
  • the application may also provide a receiving end, which may be, for example, a UE or a gNB.
  • the receiving end of this embodiment has the same structure as the transmitting end shown in Fig. 15, and may also include a processor, a memory, a transmitter, and at least one communication bus.
  • the processor is configured to determine an RLC PDU, where the RLC PDU includes at least one format indication field, where the format indication field is used to indicate whether the specified indication area corresponding to the format indication field includes a specific indication domain, and the at least one Each format indication field in the format indication field corresponds to a designated area, and a transmitter is configured to send the RLC PDU through the next layer of the protocol layer.
  • the specific indication domain includes: a continuous lost packet SN number indication domain, and/or a SOstart domain, and/or a SOend domain.
  • the receiving end provided in this embodiment may be used to perform the foregoing technical solution of the method embodiment shown in FIG. 17.
  • the implementation principle and the technical effect are similar to the method embodiment, and details are not described herein again.
  • the present application further provides a readable storage medium.
  • the readable storage medium stores execution instructions.
  • the transmitting end executes the data transmission method provided by the method embodiment shown in FIG. 16 .
  • the present application further provides a readable storage medium.
  • the readable storage medium stores execution instructions.
  • the receiving end executes the data transmission method provided by the method embodiment shown in FIG.
  • the application also provides a program product comprising an execution instruction stored in a readable storage medium.
  • the at least one processor at the receiving end can read the execution instruction from the readable storage medium, and the at least one processor executes the execution instruction such that the transmitting end implements the data transmission method provided by the method embodiment shown in FIG.
  • the application also provides a program product comprising an execution instruction stored in a readable storage medium.
  • At least one processor at the transmitting end can read the execution instruction from a readable storage medium, and the at least one processor executes the execution instruction such that the receiving end implements the data transmission method provided by the method embodiment shown in FIG.
  • the device can perform functions similar to the processor of Figure 14.
  • the device includes a processor 1801, a transmit data processor 1802, and a receive data processor 1803.
  • the above processing module may be the processor 1801 and perform the corresponding functions.
  • the above sending module may be the transmitting data processor 1802 in FIG. 18, and the receiving module may be the receiving data processor 1803 in FIG.
  • a channel coder and a channel decoder are shown in the drawings, it is to be understood that these modules are not intended to be limiting, and are merely illustrative.
  • the processing device 1900 includes modules such as a modulation subsystem, a central processing subsystem, and a peripheral subsystem.
  • the transmitting end and the receiving end in this embodiment can be used as a modulation subsystem therein.
  • the modulation subsystem may include a processor 1901, an interface 1902.
  • the processor 1901 performs the functions of the foregoing processing module, and the interface 1902 performs the functions of the foregoing sending module and/or the receiving module.
  • the modulation subsystem includes a memory 1903, a processor 1901, and a program stored on the memory and executable on the processor, the processor executing the program to implement the method described in the above method embodiments.
  • the memory 1903 may be non-volatile or volatile, and its location may be located inside the modulation subsystem or in the processing device 1900 as long as the memory 1903 can be connected to the The processor 1901 is sufficient.
  • the processor may be a central processing unit (English: Central Processing Unit, CPU for short), or other general-purpose processor, digital signal processor (English: Digital Signal Processor) , referred to as: DSP), ASIC (English: Application Specific Integrated Circuit, referred to as: ASIC).
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in connection with the present application may be directly embodied by hardware processor execution or by a combination of hardware and software modules in a processor.
  • All or part of the steps of implementing the above method embodiments may be performed by hardware associated with the program instructions.
  • the aforementioned program can be stored in a readable memory.
  • the steps including the foregoing method embodiments are performed; and the foregoing memory (storage medium) includes: read-only memory (English: read-only memory, abbreviation: ROM), RAM, flash memory, hard disk, Solid state drive, magnetic tape (English: magnetic tape), floppy disk (English: floppy disk), optical disc (English: optical disc) and any combination thereof.

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Abstract

本申请提供一种数据传输方法、装置、设备及系统，该方法包括：接收端，接收无线链路控制层协议数据单元RLC PDU；所述接收端，判断所述RLC PDU包含完整的服务数据单元SDU还是SDU分段，所述RLC PDU使用无应答模式UM进行传输；所述接收端，根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层。本申请提供的数据传输方法、装置、设备及系统实现了5G中UM下RLC层的数据传输。

Description

数据传输方法、装置、设备及系统
本申请要求于2017年5月5日提交中国专利局、申请号为201710314173.4、申请名称为“数据传输方法、装置、设备及系统”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，尤其涉及一种数据传输方法、装置、设备及系统。
背景技术
无线链路控制(Radio Link Control，RLC)层有三种工作模式：透明模式(Transparent Mode，TM)、无应答模式(Unacknowledged Mode，UM)和应答模式(Acknowledged Mode,AM)。
现有技术中，UM下的RLC层主要完成分段级联、重排序和重复检测。在第五代移动通信技术(5rd Generation，5G)中，为了缩短处理时延，UM下的RLC层不再进行重排序和重复检测功能，由分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)层进行重排序和重复检测。
因此，5G中UM下的RLC层如何进行数据传输成为目前亟待解决的问题。
发明内容
本申请实施例提供一种数据传输方法、装置、设备及系统，用以解决现有技术中UM下的RLC层如何进行数据传输成为目前亟待解决的问题。
第一方面，本申请提供一种数据传输方法，该包括：接收端接收RLC PDU；该接收端判断该RLC PDU包含完整的SDU还是SDU分段，该RLC PDU使用UM进行传输；该接收端根据判断的结果，传输该完整的SDU或者该SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层。
通过第一方面提供的数据传输方法，接收端判断RLC PDU包含完整的SDU还是SDU分段，并根据判断的结果传输该完整的SDU或该SDU分段组装成的完整的SDU给PDCP层，实现了5G中UM下的RLC层的数据接收。另外，由于接收端直接将完整的SDU传输给PDCP层，避免了RLC层等待进行重排序时带来的处理时延。
在一种可能实现的方式中，该接收端判断该RLC PDU包含完整的SDU还是SDU分段，包括：该接收端判断该RLC PDU中是否包含RLC包头；当该RLC PDU中未包含RLC包头时，该接收端确定该RLC PDU包含完整的SDU；当该RLC PDU中包含RLC包头时，该接收端确定该RLC PDU包含SDU分段。
通过该实施方式提供的数据传输方法，接收端可以通过判断RLC PDU是否包含RLC包头来确定RLC PDU包含完整的SDU还是SDU分段。另外，当RLC PDU包含完整的SDU时，RLC PDU不需要包含RLC包头，从而减小了传输开销。
在一种可能实现的方式中，该接收端判断该RLC PDU是否包含RLC包头，包括：该接收端，根据媒体接入控制MAC PDU的MAC包头中用于指示该RLC PDU是否包含RLC包头的指示信息，判断该RLC PDU是否包含RLC包头；其中，该MAC PDU包含该RLC PDU。
在一种可能实现的方式中，当该RLC PDU包含完整的SDU时，该RLC PDU的RLC包头中未包含该完整的SDU的SN。
通过该实施方式提供的数据传输方法，RLC PDU包含完整的SDU时，其RLC包头中未包含该完整的SDU的SN，从而减小了传输开销。
在一种可能实现的方式中，该接收端根据判断的结果，传输该完整的SDU或者该SDU分段组装成的完整的SDU给PDCP层，包括：
当判断的结果为该RLC包含SDU分段时，该接收端按照接收顺序将该SDU分段放入缓冲窗中，并判断该缓存窗中是否存储了组装该SDU分段所属的完整的SDU所需的所有SDU分段，该缓冲窗中按照接收顺序存储了最近接收的未能组装成完整的SDU的M个SDU分段；当该缓存窗中存储了组装该SDU分段所属的完整的SDU所需的所有SDU分段时，该接收端进行组装，并将组装成的完整的SDU传输给该PDCP层，M为大于0且小于或等于该缓冲窗的大小的整数；
当判断的结果为该RLC PDU包含完整的SDU时，该接收端传输该RLC PDU包含的完整的SDU给该PDCP层。
通过该实施方式提供的数据传输方法，可以基于缓冲窗的方式实现传输该SDU分段组装成的完整的SDU给PDCP层，确保SDU分段不会长时间滞留在缓冲中，占用缓冲。
在一种可能实现的方式中，该方法还包括：该接收端将该缓冲窗中用于组装完整的SDU的SDU分段删除，并对该缓冲窗中剩余的SDU分段按照接收顺序重新排列。
在一种可能实现的方式中，该接收端按照接收顺序将该SDU分段放入缓冲窗之前，还包括：当该缓冲窗中分段数量等于该缓冲窗的大小时，该接收端将该缓冲窗中最早接收的SDU分段以及与该最早接收的SDU分段属于同一完整的SDU的其他SDU分段删除，并将该缓冲窗中剩余的SDU分段按照接收顺序重新排列。
在一种可能实现的方式中，该方法还包括：
当该缓冲窗中最早接收的SDU分段更新时，该接收端重启定时器；
当该定时器超时时，该接收端将该缓冲窗中最早接收的N个SDU分段以及与该N个SDU分段中的每一个SDU分段属于同一完整的SDU的其他SDU分段删除，并将该缓冲窗中剩余的SDU分段按照接收顺序重新排列，N为大于0且小于或等于该缓冲窗的大小的整数。
通过该实施方式提供的数据传输方法，可以清除缓冲窗中某个或某些长时间无法组成完整的SDU的无用SDU分段。
在一种可能实现的方式中，该接收端根据判断的结果，传输该完整的SDU或者该SDU分段组装成的完整的SDU给PDCP层，包括：
当判断的结果为该RLC包含SDU分段时，在定时器运行过程中，该接收端判断是否收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段；当收到了组装 该SDU分段所属的完整的SDU所需的所有SDU分段时，该接收端进行组装，将组装成的完整的SDU传输给该PDCP层，并停止该定时器；其中，该定时器与该SDU分段所属的完整的SDU对应；
当判断的结果为该RLC PDU包含完整的SDU时，该接收端传输该RLC PDU包含的完整的SDU给该PDCP层。
通过该实施方式提供的数据传输方法，可以基于一个完整的SDU对应一个定时器的方式实现传输该SDU分段组装成的完整的SDU给PDCP层，确保属于同一完整的SDU的SDU分段不会长时间滞留在缓冲中，占用缓冲。
在一种可能实现的方式中，该方法还包括：当该定时器超时时，该接收端将该SDU分段以及与该SDU分段属于同一完整的SDU的SDU分段丢弃。
在一种可能实现的方式中，该在定时器运行过程中，该接收端判断是否收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段之前，还包括：当该SDU分段为该SDU分段所属的完整的SDU的第一个接收到的SDU分段时，该接收端启动该定时器。
通过该实施方式提供的数据传输方法，可以实现对等待接收一完整的SDU的所有SDU分段的总时长的控制。
在一种可能实现的方式中，该在定时器运行过程中，该接收端判断是否收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段之前，还包括：该接收端，判断该定时器是否正在运行；当该定时器正在运行时，该接收端重启该定时器；当该定时器未运行时，该接收端启动该定时器。
通过该实施方式提供的数据传输方法，可以实现对等待接收与一SDU分段属于同一完整的SDU的下一个SDU分段的时长的控制。
在一种可能实现的方式中，该接收端根据判断的结果，传输该完整的SDU或者该SDU分段组装成的完整的SDU给PDCP层，包括：
当判断的结果为该RLC PDU包含SDU分段时，在定时器运行过程中，该接收端判断是否收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段；当收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段时，该接收端进行组装，并将组装成的完整的SDU传输给该PDCP层；其中，该定时器与SDU分段对应；
当判断的结果为该RLC PDU包含完整的SDU时，该接收端传输该RLC PDU包含的完整的SDU给该PDCP层。
通过该实施方式提供的数据传输方法，可以基于所有SDU分段对应同一个定时器的实现传输该SDU分段组装成的完整的SDU给PDCP层，确保与该定时器对应的SDU分段以及早于该定时器对应的SDU分段所接收到的SDU分段不会长时间滞留在缓冲中，占用缓冲。
在一种可能实现的方式中，该在定时器运行过程中，该接收端判断是否收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段之前，还包括：该接收端，判断该定时器是否正在运行；当该定时器未运行时，该接收端确定与该定时器对应的SDU分段为该RLC PDU包含的SDU分段，并启动该定时器。
在一种可能实现的方式中，该方法还包括：当该定时器超时时，该接收端将该定 时器对应的SDU分段以及早于该定时器对应的SDU分段所接收的SDU分段丢弃。
在一种可能实现的方式中，该方法还包括：当该定时器超时时，该接收端判断是否存在等待组装的SDU分段；当存在等待组装的SDU分段时，该接收端确定该定时器与所有等待组装的SDU分段中最新接收到的SDU分段对应，并启动该定时器。
在一种可能实现的方式中，该方法还包括：当该定时器超时时，该接收端将晚于该定时器对应的SDU分段接收到的，且与所丢弃的SDU分段属于同一完整的SDU的SDU分段丢弃。
通过该实施方式提供的数据传输方法，在该定时器超时时，除了将该定时器对应的SDU分段以及早于该定时器对应的SDU分段所接收的SDU分段丢弃之外，还可以将晚于该定时器对应的SDU分段接收到的，且与所丢弃的SDU分段属于同一完整的SDU的SDU分段丢弃，从而节省了缓存空间。
第二方面，本申请提供一种数据传输方法，包括：发送端判断待发送的SDU是否需要分段；当该完整的SDU不需要分段时，该发送端将该完整的SDU包含在RLC PDU中，该RLC PDU的RLC包头中不包含该完整的SDU的SN；该发送端将该RLC PDU通过MAC层发送出去，该RLC PDU使用UM进行传输。
通过第二方面提供的数据传输方法，通过发送端在确定待发送的完整的SDU不需要分段时，将该完整的SDU包含在RLC PDU中，并将该RLC PDU通过MAC层发送出去，且该RLC PDU的RLC包头中不包含该完整的SDU的SN，实现了5G中UM下的RLC层的数据发送。另外，由于包含完整的SDU的RLC PDU的RLC包头中未包含该完整的SDU的SN，因此可以节省传输开销。
第三方面，本申请提供一种数据传输方法，包括：发送端判断待发送的完整的SDU是否需要分段；当该完整的SDU不需要分段时，该发送端将该完整的SDU作为RLC PDU；该发送端通知MAC层在MAC PDU的MAC包头中增加用于指示该RLC PDU未包含RLC包头的指示信息，并将该RLC PDU通过该MAC层发送出去，该MAC PDU包含该RLC PDU，该RLC PDU使用UM进行传输。
通过第三方面提供的数据传输方法，发送端在确定待发送的完整的SDU不需要分段时，将该完整的SDU作为RLC PDU，通知MAC层在MAC PDU的MAC包头中增加用于指示该RLC PDU未包含RLC包头的指示信息，并将该RLC PDU通过MAC层发送出去，实现了5G中UM下的RLC层的数据发送。另外，由于包含完整的SDU的RLC PDU未包含RLC包头，因此可以节省传输开销。
第四方面，本申请提供一种数据传输装置，包括：
接收模块，用于接收无线链路控制层协议数据单元RLC PDU；
处理模块，用于判断该RLC PDU包含完整的服务数据单元SDU还是SDU分段，并根据判断的结果，传输该完整的SDU或者该SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层，该RLC PDU使用无应答模式UM进行传输；。
在一种可能实现的方式中，该处理模块判断该RLC PDU包含完整的服务数据单元SDU还是SDU分段，具体包括：判断该RLC PDU中是否包含RLC包头；当该RLC PDU中未包含RLC包头时，确定该RLC PDU包含完整的SDU；当该RLC PDU中包含RLC包头时，确定该RLC PDU包含SDU分段。
在一种可能实现的方式中，该处理模块判断该RLC PDU是否包含RLC包头，具体包括：
根据媒体接入控制MAC PDU的MAC包头中用于指示该RLC PDU是否包含RLC包头的指示信息，判断该RLC PDU是否包含RLC包头；其中，该MAC PDU包含该RLC PDU。
在一种可能实现的方式中，当该RLC PDU包含完整的SDU时，该RLC PDU的RLC包头中未包含该完整的SDU的序列号SN。
在一种可能实现的方式中，该处理模块根据判断的结果，传输该完整的SDU或者该SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层，具体包括：
当判断的结果为该RLC包含SDU分段时，按照接收顺序将该SDU分段放入缓冲窗中，并判断该缓存窗中是否存储了组装该SDU分段所属的完整的SDU所需的所有SDU分段，当该缓存窗中存储了组装该SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，并将组装成的完整的SDU传输给该PDCP层；其中，该缓冲窗中按照接收顺序存储了最近接收的未能组装成完整的SDU的M个SDU分段M为大于0且小于或等于该缓冲窗的大小的整数；
当判断的结果为该RLC PDU包含完整的SDU时，传输该RLC PDU包含的完整的SDU给该PDCP层。
在一种可能实现的方式中，该处理模块，还用于将该缓冲窗中用于组装完整的SDU的SDU分段删除，并对该缓冲窗中剩余的SDU分段按照接收顺序重新排列。
在一种可能实现的方式中，该处理模块，还用于当该缓冲窗中分段数量等于该缓冲窗的大小时，将该缓冲窗中最早接收的SDU分段以及与该最早接收的SDU分段属于同一完整的SDU的其他SDU分段删除，并将该缓冲窗中剩余的SDU分段按照接收顺序重新排列。
在一种可能实现的方式中，该处理模块，还用于：当该缓冲窗中最早接收的SDU分段更新时，重启定时器；当该定时器超时时，将该缓冲窗中最早接收的N个SDU分段以及与该N个SDU分段中的每一个SDU分段属于同一完整的SDU的其他SDU分段删除，并将该缓冲窗中剩余的SDU分段按照接收顺序重新排列，N为大于0且小于或等于该缓冲窗的大小的整数。
在一种可能实现的方式中，该处理模块根据判断的结果，传输该完整的SDU或者该SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层，具体包括：
当判断的结果为该RLC包含SDU分段时，在定时器运行过程中，判断是否收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段，当收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，将组装成的完整的SDU传输给该PDCP层，并停止该定时器；其中，该定时器与该SDU分段所属的完整的SDU对应；
当判断的结果为该RLC PDU包含完整的SDU时，传输该RLC PDU包含的完整的SDU给该PDCP层。
在一种可能实现的方式中，该处理模块，还用于当该定时器超时时，将该SDU分段以及与该SDU分段属于同一完整的SDU的SDU分段丢弃。
在一种可能实现的方式中，该处理模块，还用于当该SDU分段为该SDU分段所属的完整的SDU的第一个接收到的SDU分段时，启动该定时器。
在一种可能实现的方式中，该处理模块，还用于：判断该定时器是否正在运行；当该定时器正在运行时，重启该定时器；当该定时器未运行时，启动该定时器。
在一种可能实现的方式中，该处理模块根据判断的结果，传输该完整的SDU或者该SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层，具体包括：
当判断的结果为该RLC PDU包含SDU分段时，在定时器运行过程中，判断是否收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段，当收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，并将组装成的完整的SDU传输给该PDCP层；其中，该定时器与SDU分段对应；
当判断的结果为该RLC PDU包含完整的SDU时，传输该RLC PDU包含的完整的SDU给该PDCP层。
在一种可能实现的方式中，该处理模块，还用于：判断该定时器是否正在运行；当该定时器未运行时，确定与该定时器对应的SDU分段为该RLC PDU包含的SDU分段，并启动该定时器。
在一种可能实现的方式中，该处理模块，还用于当该定时器超时时，将该定时器对应的SDU分段以及早于该定时器对应的SDU分段所接收的SDU分段丢弃。
在一种可能实现的方式中，该处理模块还用于：当该定时器超时时，判断是否存在等待组装的SDU分段；当存在等待组装的SDU分段时，确定该定时器与所有等待组装的SDU分段中最新接收到的SDU分段对应，并启动该定时器。
在一种可能实现的方式中，该处理模块，还用于当该定时器超时时，将晚于该定时器对应的SDU分段接收到的，且与所丢弃的SDU分段属于同一完整的SDU的SDU分段丢弃。
上述第四方面以及第四方面的各可能的实施方式所提供的数据发送装置，其有益效果可以参照上述第一方面以及第一方面的各可能的实施方式所带来的有益效果，在此不再赘述。
第五方面，本申请提供一种数据传输装置，包括：
处理模块，用于判断待发送的完整的服务数据单元SDU是否需要分段，当该完整的SDU不需要分段时，将该完整的SDU包含在无线链路控制层协议数据单元RLC PDU中，该RLC PDU的RLC包头中不包含该完整的SDU的SN；
发送模块，用于将该RLC PDU通过媒体接入控制MAC层发送出去，该RLC PDU使用无应答模式UM进行传输。
上述第五方面所提供的数据发送装置，其有益效果可以参照上述第二方面所带来的有益效果，在此不再赘述。
第六方面，本申请提供一种数据传输装置，包括：
处理模块，用于判断待发送的完整的SDU是否需要分段，当该完整的服务数据单元SDU不需要分段时，将该完整的SDU作为无线链路控制层协议数据单元RLC PDU；
发送模块，用于通知媒体介入控制MAC层在MAC PDU的MAC包头中增加用于指示该RLC PDU未包含RLC包头的指示信息，并将该RLC PDU通过该MAC层发送 出去，该MAC PDU包含该RLC PDU，该RLC PDU使用无应答模式UM进行传输。
上述第六方面所提供的数据发送装置，其有益效果可以参照上述第三方面所带来的有益效果，在此不再赘述。
第七方面，本申请提供一种接收端，包括：接收器和处理器；
该接收器，用于接收无线链路控制层协议数据单元RLC PDU；
该处理器，用于判断该RLC PDU包含完整的服务数据单元SDU还是SDU分段，并根据判断的结果，传输该完整的SDU或者该SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层，该RLC PDU使用无应答模式UM进行传输。
在一种可能实现的方式中，该处理器判断该RLC PDU包含完整的SDU还是SDU分段，具体包括：判断该RLC PDU中是否包含RLC包头；当该RLC PDU中未包含RLC包头时，确定该RLC PDU包含完整的SDU；当该RLC PDU中包含RLC包头时，确定该RLC PDU包含SDU分段。
在一种可能实现的方式中，该处理器判断该RLC PDU是否包含RLC包头，具体包括：根据媒体接入控制MAC PDU的MAC包头中用于指示该RLC PDU是否包含RLC包头的指示信息，判断该RLC PDU是否包含RLC包头；其中，该MAC PDU包含该RLC PDU。
在一种可能实现的方式中，当该RLC PDU包含完整的SDU时，该RLC PDU的RLC包头中未包含该完整的SDU的序列号SN。
在一种可能实现的方式中，该处理器根据判断的结果，传输该完整的SDU或者该SDU分段组装成的完整的SDU给PDCP层，具体包括：
当判断的结果为该RLC包含SDU分段时，按照接收顺序将该SDU分段放入缓冲窗中，并判断该缓存窗中是否存储了组装该SDU分段所属的完整的SDU所需的所有SDU分段，该缓冲窗中按照接收顺序存储了最近接收的未能组装成完整的SDU的M个SDU分段；当该缓存窗中存储了组装该SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，并将组装成的完整的SDU传输给该PDCP层，M为大于0且小于或等于该缓冲窗的大小的整数；
当判断的结果为该RLC PDU包含完整的SDU时，传输该RLC PDU包含的完整的SDU给该PDCP层。
在一种可能实现的方式中，述处理器，还用于将该缓冲窗中用于组装完整的SDU的SDU分段删除，并对该缓冲窗中剩余的SDU分段按照接收顺序重新排列。
在一种可能实现的方式中，该处理器，还用于当该缓冲窗中分段数量等于该缓冲窗的大小时，将该缓冲窗中最早接收的SDU分段以及与该最早接收的SDU分段属于同一完整的SDU的其他SDU分段删除，并将该缓冲窗中剩余的SDU分段按照接收顺序重新排列。
在一种可能实现的方式中，该处理器还用于：当该缓冲窗中最早接收的SDU分段更新时，重启定时器；当该定时器超时时，将该缓冲窗中最早接收的N个SDU分段以及与该N个SDU分段中的每一个SDU分段属于同一完整的SDU的其他SDU分段删除，并将该缓冲窗中剩余的SDU分段按照接收顺序重新排列，N为大于0且小于或等于该缓冲窗的大小的整数。
在一种可能实现的方式中，该处理器根据判断的结果，传输该完整的SDU或者该SDU分段组装成的完整的SDU给PDCP层，具体包括：
当判断的结果为该RLC包含SDU分段时，在定时器运行过程中，判断是否收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段；当收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，将组装成的完整的SDU传输给该PDCP层，并停止该定时器；其中，该定时器与该SDU分段所属的完整的SDU对应；
当判断的结果为该RLC PDU包含完整的SDU时，传输该RLC PDU包含的完整的SDU给该PDCP层。
在一种可能实现的方式中，该处理器，还用于当该定时器超时时，将该SDU分段以及与该SDU分段属于同一完整的SDU的SDU分段丢弃。
在一种可能实现的方式中，该处理器，还用于当该SDU分段为该SDU分段所属的完整的SDU的第一个接收到的SDU分段时，启动该定时器。
在一种可能实现的方式中，该处理器，还用于：判断该定时器是否正在运行；当该定时器正在运行时，重启该定时器；当该定时器未运行时，启动该定时器。
在一种可能实现的方式中，该处理器根据判断的结果，传输该完整的SDU或者该SDU分段组装成的完整的SDU给PDCP层，具体包括：
当判断的结果为该RLC PDU包含SDU分段时，在定时器运行过程中，判断是否收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段；当收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，并将组装成的完整的SDU传输给该PDCP层；其中，该定时器与SDU分段对应；
当判断的结果为该RLC PDU包含完整的SDU时，传输该RLC PDU包含的完整的SDU给该PDCP层。
在一种可能实现的方式中，该处理器还用于：判断该定时器是否正在运行；当该定时器未运行时，确定与该定时器对应的SDU分段为该RLC PDU包含的SDU分段，并启动该定时器。
在一种可能实现的方式中，该处理器，还用于当该定时器超时时，将该定时器对应的SDU分段以及早于该定时器对应的SDU分段所接收的SDU分段丢弃。
在一种可能实现的方式中，该处理器还用于：当该定时器超时时，判断是否存在等待组装的SDU分段；当存在等待组装的SDU分段时，确定该定时器与所有等待组装的SDU分段中最新接收到的SDU分段对应，并启动该定时器。
在一种可能实现的方式中，该处理器，还用于当该定时器超时时，将晚于该定时器对应的SDU分段接收到的，且与所丢弃的SDU分段属于同一完整的SDU的SDU分段丢弃。
上述第七方面以及第七方面的各可能的实施方式所提供的数据发送装置，其有益效果可以参照上述第一方面以及第一方面的各可能的实施方式所带来的有益效果，在此不再赘述。
第八方面，本申请提供一种发送端，包括：发送器和处理器；
该处理器，用于判断待发送的完整的服务数据单元SDU是否需要分段，当该完整 的SDU不需要分段时，将该完整的SDU包含在无线链路控制层协议数据单元RLC PDU中，该RLC PDU的RLC包头中不包含该完整的SDU的SN；
该发送器，用于将该RLC PDU通过媒体接入控制MAC层发送出去，该RLC PDU使用无应答模式UM进行传输。
上述第八方面所提供的数据发送装置，其有益效果可以参照上述第二方面所带来的有益效果，在此不再赘述。
第九方面，本申请提供一种发送端，包括：发送器和处理器；
该处理器，用于判断待发送的完整的SDU是否需要分段，当该完整的服务数据单元SDU不需要分段时，将该完整的SDU作为无线链路控制层协议数据单元RLC PDU，通知媒体介入控制MAC层在MAC PDU的MAC包头中增加用于指示该RLC PDU未包含RLC包头的指示信息；其中，该MAC PDU包含该RLC PDU，该RLC PDU使用无应答模式UM进行传输；
该发送器，用于将该RLC PDU通过该MAC层发送出去。
上述第九方面所提供的数据发送装置，其有益效果可以参照上述第三方面所带来的有益效果，在此不再赘述
第十方面，本申请提供一种接收端，包括用于执行上述第一方面或者第一方面的各种实施方式的方法的至少一个处理元件(或芯片)。
第十一方面，本申请提供一种发送端，包括用于执行上述第二方面的方法的至少一个处理元件(或芯片)。
第十二方面，本申请提供一种发送端，包括用于执行上述第三方面的方法的至少一个处理元件(或芯片)。
第十三方面，本申请提供一种可读存储介质，可读存储介质中存储有执行指令，当接收端的至少一个处理器执行该执行指令时，接收端执行上述第一方面或者第一方面的各种实施方式提供的数据传输方法。
第十四方面，本申请提供一种可读存储介质，可读存储介质中存储有执行指令，当发送端的至少一个处理器执行该执行指令时，发送端执行上述第二方面提供的数据传输方法。
第十五方面，本申请提供一种可读存储介质，可读存储介质中存储有执行指令，当发送端的至少一个处理器执行该执行指令时，发送端执行上述第三方面提供的数据传输方法。
第十六方面，本申请提供一种程序产品，该程序产品包括执行指令，该执行指令存储在可读存储介质中。接收端的至少一个处理器可以从可读存储介质读取该执行指令，至少一个处理器执行该执行指令使得接收端实施第一方面或者第一方面的各种实施方式提供的数据传输方法。
第十七方面，本申请提供一种程序产品，该程序产品包括执行指令，该执行指令存储在可读存储介质中。发送端的至少一个处理器可以从可读存储介质读取该执行指令，至少一个处理器执行该执行指令使得发送端实施第二方面提供的数据传输方法。
第十八方面，本申请提供一种程序产品，该程序产品包括执行指令，该执行指令存储在可读存储介质中。发送端的至少一个处理器可以从可读存储介质读取该执行指 令，至少一个处理器执行该执行指令使得发送端实施第三方面提供的数据传输方法。
第十九方面，本申请提供一种数据传输系统，包括上述第五方面或第六方面所述的数据传输装置，以及第四方面或第四方面的各实施例方式所述的数据传输装置。
第二十方面，本申请提供一种数据传输方法，包括：
发送端，确定协议层的协议数据单元PDU，所述PDU包含所述协议层的上一层的PDU的格式指示域，所述格式指示域用于指示所述上一层的PDU中是否包含特定信息；
所述发送端，将所述协议层的PDU通过所述协议层的下一层发送出去。
在一种可能实现的方式中，所述协议层为数据汇聚协议层PDCP或者无线链路控制RLC层。
在一种可能实现的方式中，当所述协议层为PDCP时，所述协议层的上一层为服务数据适配协议数据单元SDAP。
在一种可能实现的方式中，当所述协议层为RLC时，所述协议层的上一层为PDCP。
在一种可能实现的方式中，当所述协议层的上一层为SDAP层时，所述特定信息为服务质量流标识(QoS flow ID)。
在一种可能实现的方式中，当所述协议层的上一层为SDAP层时，所述特定信息为PDU包头。
在一种可能实现的方式中，当所述协议层的上一层为SDAP层时，所述格式指示域具体可以包括在所述协议层的PDU包头中。
在一种可能实现的方式中，当所述协议层的上一层为PDCP层时，所述特定信息为序列号SN。
通过第二十方面提供的数据传输方法，由于在某些传输场景下特定信息并不是必须要携带的，通过在协议层的PDU中包括用于指示该协议层的上一层是否包含特定信息的格式指示域，且特定指示信息的长度通常较格式指示域的长度长，从而减小了传输开销。
第二十一方面，本申请提供一种数据传输方法，包括：
接收端，确定RLC PDU，所述RLC PDU包含至少一个格式指示域；所述格式指示域用于指示所述格式指示域对应的指定区域内是否包含特定指示域，所述至少一个格式指示域中的每一个格式指示域分别对应一个指定区域；
所述接收端，将所述RLC PDU通过所述协议层的下一层发送出去。
在一种可能实现的方式中，所述特定指示域包括：连续丢失包SN号指示域，和/或SOstart域，和/或SOend域。
通过第二十一方面提供的数据传输方法，RLC PDU包含格式指示域，且该格式指示域指示出与该格式指示域对应的指定区域内是否包含特定指示域，避免了不需要携带特定指示域时携带而带来的传输开销，从而减小了传输开销。
第二十二方面，本申请提供一种数据传输装置，包括：
处理模块，用于确定协议层的协议数据单元PDU，所述PDU包含所述协议层的上一层的PDU的格式指示域，所述格式指示域用于指示所述上一层的PDU中是否包含特定信息；
发送模块，用于将所述协议层的PDU通过所述协议层的下一层发送出去。
在一种可能实现的方式中，所述协议层为数据汇聚协议层PDCP或者无线链路控制RLC层。
在一种可能实现的方式中，当所述协议层为PDCP时，所述协议层的上一层为服务数据适配协议数据单元SDAP。
在一种可能实现的方式中，当所述协议层为RLC时，所述协议层的上一层为PDCP。
在一种可能实现的方式中，当所述协议层的上一层为SDAP层时，所述特定信息为服务质量流标识(QoS flow ID)。
在一种可能实现的方式中，当所述协议层的上一层为SDAP层时，所述特定信息为PDU包头。
在一种可能实现的方式中，当所述协议层的上一层为SDAP层时，所述格式指示域具体可以包括在所述协议层的PDU包头中。
在一种可能实现的方式中，当所述协议层的上一层为PDCP层时，所述特定信息为序列号SN。
上述第二十二方面所提供的数据发送装置，其有益效果可以参照上述第二十方面所带来的有益效果，在此不再赘述。
第二十三方面，本申请提供一种数据传输装置，包括：
处理模块，用于确定RLC PDU，所述RLC PDU包含至少一个格式指示域；所述格式指示域用于指示所述格式指示域对应的指定区域内是否包含特定指示域，所述至少一个格式指示域中的每一个格式指示域分别对应一个指定区域；
发送模块，用于将所述RLC PDU通过所述协议层的下一层发送出去。
在一种可能实现的方式中，所述特定指示域包括：连续丢失包SN号指示域，和/或SOstart域，和/或SOend域。
上述第二十三方面所提供的数据发送装置，其有益效果可以参照上述第二十一方面所带来的有益效果，在此不再赘述。
第二十四方面，本申请提供一种发送端，包括：
处理器，用于确定协议层的协议数据单元PDU，所述PDU包含所述协议层的上一层的PDU的格式指示域，所述格式指示域用于指示所述上一层的PDU中是否包含特定信息；
发送器，用于将所述协议层的PDU通过所述协议层的下一层发送出去。
在一种可能实现的方式中，所述协议层为数据汇聚协议层PDCP或者无线链路控制RLC层。
在一种可能实现的方式中，当所述协议层为PDCP时，所述协议层的上一层为服务数据适配协议数据单元SDAP。
在一种可能实现的方式中，当所述协议层为RLC时，所述协议层的上一层为PDCP。
在一种可能实现的方式中，当所述协议层的上一层为SDAP层时，所述特定信息为服务质量流标识(QoS flow ID)。
在一种可能实现的方式中，当所述协议层的上一层为SDAP层时，所述特定信息为PDU包头。
在一种可能实现的方式中，当所述协议层的上一层为SDAP层时，所述格式指示域具体可以包括在所述协议层的PDU包头中。
在一种可能实现的方式中，当所述协议层的上一层为PDCP层时，所述特定信息为序列号SN。
上述第二十四方面所提供的数据发送装置，其有益效果可以参照上述第二十方面所带来的有益效果，在此不再赘述。
第二十五方面，本申请提供一种接收端，包括：
处理器，用于确定RLC PDU，所述RLC PDU包含至少一个格式指示域；所述格式指示域用于指示所述格式指示域对应的指定区域内是否包含特定指示域，所述至少一个格式指示域中的每一个格式指示域分别对应一个指定区域；
发送器，用于将所述RLC PDU通过所述协议层的下一层发送出去。
在一种可能实现的方式中，所述特定指示域包括：连续丢失包SN号指示域，和/或SOstart域，和/或SOend域。
上述第二十五方面所提供的数据发送装置，其有益效果可以参照上述第二十一方面所带来的有益效果，在此不再赘述。
第二十六方面，本申请提供一种发送端，包括用于执行上述第二十方面的方法的至少一个处理元件(或芯片)。
第二十七方面，本申请提供一种接收端，包括用于执行上述第二十一方面的方法的至少一个处理元件(或芯片)。
第二十八方面，本申请提供一种可读存储介质，可读存储介质中存储有执行指令，当接收端的至少一个处理器执行该执行指令时，发送端行上述第二十方面提供的数据传输方法。
第二十九方面，本申请提供一种可读存储介质，可读存储介质中存储有执行指令，当发送端的至少一个处理器执行该执行指令时，接收端执行上述第二十一方面提供的数据传输方法。
第三十方面，本申请提供一种程序产品，该程序产品包括执行指令，该执行指令存储在可读存储介质中。接收端的至少一个处理器可以从可读存储介质读取该执行指令，至少一个处理器执行该执行指令使得发送端实施第二十方面提供的数据传输方法。
第三十一方面，本申请提供一种程序产品，该程序产品包括执行指令，该执行指令存储在可读存储介质中。发送端的至少一个处理器可以从可读存储介质读取该执行指令，至少一个处理器执行该执行指令使得接收端实施第二十一方面提供的数据传输方法。
附图说明
图1为本申请一实施例提供的数据传输方法的流程图；
图2为现有技术中MAC包头的示意图；
图3为本申请另一实施例提供的数据传输方法的流程图；
图4-图7B为本申请缓冲窗的示意图；
图8为本申请又一实施例提供的数据传输方法的流程图；
图9为本申请又一实施例提供的数据传输方法的流程图；
图10为本申请又一实施例提供的数据传输方法的流程图；
图11为本申请又一实施例提供的数据传输方法的流程图；
图12为本申请一实施例提供的数据传输装置的结构示意图；
图13为本申请另一实施例提供的数据传输装置的结构示意图；
图14为本申请一实施例提供的接收端的结构示意图；
图15为本申请一实施例提供的发送端的结构示意图；
图16为本申请又一实施例提供的数据传输方法的流程图；
图17为本申请又一实施例提供的数据传输方法的流程图；
图18为本申请一实施例提供的设备的结构示意图；
图19为本申请另一实施例提供的设备的结构示意图。
具体实施方式
本申请应用的背景为：在5G网络中，UM下的RLC层不再进行重排序和重复检测功能，由PDCP层进行重排序和重复检测。
本申请主要应用于5G网络中的用户设备(UE,User Equipment)和基站(gNB)。当UE向gNB发送数据时，UE为发送端，gNB为接收端；当gNB向UE发送数据时，gNB为发送端，gNB为接收端。其中，接收端具体可以为接收端RLC实体，发送端具体可以为发送端RLC实体。需要说明的是，本申请仅针对UM下的RLC层传输数据的场景。
下面以具体地实施例对本申请的技术方案进行详细说明。下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例不再赘述。
图1为本申请一实施例提供的数据传输方法的流程图。本申请实施例提供的数据传输方法可以由接收端来执行。如图1所示，本实施例的方法可以包括：
步骤101、接收RLC协议数据单元(Protocol Data Unit，PDU)。
其中，该RLC PDU使用UM进行传输。该RLC PDU中可以包括完整的服务数据单元(Service Data Unit，SDU)或者SDU分段。发送端在将SDU组装成RLC PDU的时候，为了适应MAC层指示的资源大小，有时候需要将SDU先进行分段，这里，完整的SDU是指没有经过分段就组装成RLC PDU的SDU，SDU分段是指经过分段后组装成RLC PDU的SDU。需要说明的是，本申请中的SDU具体为RLC SDU。
步骤102、判断该RLC PDU包含完整的SDU还是SDU分段。
其中，可以通过如下两种方式判断RLC PDU包含的是完整的SDU还是SDU分段。
第一种，可以通过该RLC PDU的RLC包头中的FI域来判断。其中，FI域用来指示RLC PDU中是否包含了完整的SDU。当FI域指示未包含完整的SDU时，可以确定该RLC PDU包含SDU分段。可选的，当FI域指示包含完整的SDU时，该RLC PDU的RLC包头中未包含该完整的SDU的序列号(Sequence Number，SN)。
第二种，可以通过该RLC PDU的RLC包头来判断。当该RLC PDU未包含RLC包头时，确定该RLC PDU包含完整的SDU。当该PRL PDU包含RLC包头时，确定该RLC PDU包含SDU分段。
可选的，可以根据包含该RLC PDU的MAC PDU的MAC包头中用于指示该RLC PDU是否包含RLC包头的指示信息，确定该RLC PDU是否包含RLC包头。具体的，可以在已有的MAC包头新增指示域来进行指示，或者也可以利用已有的MAC包头中的预留比特来进行指示；例如，对于图2所示的MAC包头，可以在第一个字节与第二个字节之间新增一个字节，并将新增的一个字节中的一个比特作为新增指示域来进行指示；或者也可以使用第一个字节中的任意一个预留比特(R)进行指示。另外，图2中E表示扩展域，指示此MAC头后面是否有更多的域存在。LCID表示逻辑信道标识，指示RLC PDU所属的逻辑信道或者对应MAC CE或者padding的类型。F表示格式域，指示长度域(L域)的大小。L表示长度域，指示对应的RLC PDU或者可变大小的MAC CE的长度，单位是Byte字节，且L所占的比特数可以是7比特，15比特或者16比特或者17比特或者其他大小。
步骤103、根据判断的结果，传输该完整的SDU或者该SDU分段组装成的完整的SDU给PDCP层。
其中，当判断的结果为该RLC PDU包含完整的SDU时，传输所述RLC PDU包含的完整的SDU给PDCP层。当判断的结果为该RLC PDU包含SDU分段时，可选的，可以采用如下三种方法传输该SDU分段组装成的完整的SDU给PDCP层。
第一种：采用缓冲窗的方式实现。如图3所示，具体可以包括以下步骤：
步骤301、按照接收顺序将该RLC PDU包含的SDU分段放入缓冲窗中。
其中，该缓冲窗中按照接收顺序存储了最近接收的未能组装成完整的SDU的M个SDU分段，M为大于0且小于或等于所述缓冲窗的大小的整数。例如，假设在缓冲窗的大小为8，且缓冲窗为空的前提下，依次接收到了分别为分段1、分段2、分段3、分段4、分段5、分段6、分段7的7个SDU分段之后，缓冲窗中的SDU分段可以如图4所示。
步骤302、判断该缓冲窗中是否存储了组装该SDU分段所属的完整的SDU所需的所有SDU分段。
其中，当该缓冲窗中存储了组装该SDU分段所属的完整的SDU所需的所有SDU分段时，执行步骤303。否则，结束。
步骤303、进行组装，并将组装成的完整的SDU传输给该PDCP层。
具体的，对组装该SDU分段所属的完整的SDU所需的所有SDU分段进行组装，并将组装成的完整的SDU传输给该PDCP层。
步骤304、将该缓冲窗中用于组装完整的SDU的SDU分段删除，并对该缓冲窗中剩余的SDU分段按照接收顺序重新排列。
例如，如图4所示的缓冲窗，假设完整的SDU共有三个SDU分段，分别为分段1、分段2、分段4，在将分段1、分段2、分段4删除并对缓冲窗中剩余的分段按照接收顺序重新排列后，缓冲窗中的SDU分段如图5所示。
可选的，步骤301-步骤303之前还可以包括：当该缓冲窗中分段数量等于该缓冲窗的大小时，将该缓冲窗中最早接收的SDU分段以及与该最早接收的SDU分段属于同一完整的SDU的其他SDU分段删除，并将该缓冲窗中剩余的SDU分段按照接收顺序重新排列。
例如，如图6A所示，假设缓冲窗的大小为10，步骤301-步骤303之前缓冲窗中已存储了8个SDU分段，分别为分段a-分段h，其中，分段a为最早接收的SDU分段，且分段a、分段c、分段d和分段f属于同一完整的SDU。在将分段a及与分段a属于同一完整的SDU的其他SDU分段删除，并将缓冲窗中剩余的SDU分段按照接收顺序重新排列之后，缓冲窗中的SDU分段可以如图6B所示。
可选的，进一步还可以引入定时器，以清除缓冲窗中某个或某些长时间无法组成完整的SDU的无用SDU分段。具体可以包括：当该缓冲窗中最早接收的SDU分段更新时，重启定时器；当该定时器超时时，将该缓冲窗中最早接收的N个SDU分段以及与该N个SDU分段中的每一个SDU分段属于同一完整的SDU的其他SDU分段删除，并将该缓冲窗中剩余的SDU分段按照接收顺序重新排列；其中，N为大于0且小于或等于该缓冲窗的大小的整数。
例如，如图6A和图6B所示，当缓冲窗中最早接收到的SDU分段由分段a变为分段b，即缓冲窗中最早接收的SDU分段更新时，重启定时器。在定时器运行过程中，如图7A所示依次接收到分段i-分段l。在分段b、分段j和分段l组成完整的SDU上报给PDCP之后，缓冲窗中的SDU分段如图7B所示。如图7A和图7B所示，由于缓冲窗中最早接收到的SDU分段由分段b变更为分段e，因此重启定时器。在定时器运行过程中，若分段e未能与其他SDU分段组成完整的SDU上报给PDCP，则当定时器超时时，可以将缓冲窗中分段e以及与缓冲窗中与分段e属于同一完整的SDU的SDU分段删除，或者也可以将缓冲窗中分段e、分段g、与分段e属于同一完整的SDU的SDU分段，以及与分段g属于同一完整的SDU的SDU分段删除。
可选的，上述缓冲窗的大小可以通过网络配置，配置方式可以是通过无线资源控制(Radio Resource Control，RRC)信令配置。具体大小设置可以根据SN的长度决定，可以是SN长度所能指示最大SDU数量的P分之一。例如，若SN长度为10比特，则最大指示的SDU数量为2^10＝1024个，如果P＝2，则缓冲窗的大小为1024/2＝512。P的大小可以是固定的，也可以是网络通过RRC信令配置的。
综上所述，通过基于缓冲窗的方式实现传输该SDU分段组装成的完整的SDU给PDCP层，可以确保SDU分段不会长时间滞留在缓冲中，占用缓冲。
第二种：采用一个完整的SDU对应一个定时器的方式实现。如图8所示，具体可以包括以下步骤：
步骤801、在定时器运行过程中，判断是否收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段。
其中，当收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，执行步骤802。当未收到组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，执行步骤803。
其中，该定时器与该SDU分段所属的完整的SDU对应，即一个完整的SDU对应一个定时器。完整的SDU与定时器的对应关系可以是动态分配的，也可以是静态分配的，这里并不做限制。可选的，基于等待接收一完整的SDU的所有SDU分段的总时长不应超过一定阈值的考虑，可以仅在RLC PDU包含的SDU分段为该SDU分段所属的完整的SDU的第一个接收到的SDU分段时，启动与该SDU的分段所属的完整的 SDU对应的定时器。或者，基于等待接收与一SDU分段属于同一完整的SDU的下一个SDU分段的时长不应超过一定阈值的考虑，可以在接收到该SDU分段所属的完整的SDU的任何一个SDU分段时，都重新启动与该SDU的分段所属的完整的SDU对应的定时器。
具体的，步骤801之前可以包括：判断该RLC PDU包含的SDU分段是否为该SDU分段所属的完整的SDU的第一个接收到的SDU分段；当该RLC PDU包含的SDU分段为该SDU分段所属的完整的SDU的第一个接收到的SDU分段时，启动与该SDU分段所属的完整的SDU分段对应的定时器，并在启动之后执行步骤801；当该RLC PDU包含的SDU分段不为该SDU分段所属的完整的SDU的第一个接收到的SDU分段时，执行步骤801。
或者，步骤801之前可以包括：判断与该SDU分段所属的完整的SDU对应的定时器是否正在运行；当正在运行时，重启该定时器，并在重启之后执行步骤801；当未运行时，启动该定时器，并在启动之后执行步骤801。
步骤802、进行组装，并将组装成的完整的SDU传输给该PDCP层，并停止该定时器。
具体的，对组装该SDU分段所属的完整的SDU所需的所有SDU分段进行组装，并将组装成的完整的SDU传输给该PDCP层。其中，在确定该SDU分段能够与其他SDU分段组装成完整的SDU之后，就可以停止该定时器。
步骤803、当该定时器超时时，将该SDU分段以及与该SDU分段属于同一完整的SDU的SDU分段丢弃。
其中，当该定时器超时时，说明在定时器规定的时间范围内未能组装成完整的SDU，因此将该SDU分段以及与该SDU分段属于同一完整的SDU的SDU分段丢弃。
以仅在RLC PDU包含的SDU分段为该SDU分段所属的完整的SDU的第一个接收到的SDU分段时，启动与该SDU的分段所属的完整的SDU对应的定时器为例。假设定时器1与完整的SDU1对应，完整的SDU1共有4个SDU分段，分别为分段1、分段2、分段3和分段4，且完整的SDU1的第一个接收到的SDU分段为分段1。当接收到分段1时，启动定时器1。之后，当在定时器1运行的过程中接收到分段2、分段3和分段时，将分段1-分段4组装成完整的SDU1传输给PDCP，并停止定时器1；当在定时器1运行的过程中仅接收到分段2和分段3时，说明未在定时器1规定的时间范围内接收到完整的SDU1的所有的SDU分段，因此在定时器1超时时则将分段1、分段2和分段3丢弃。
以在接收到该SDU分段所属的完整的SDU的任何一个SDU分段时，都重新启动与该SDU的分段所属的完整的SDU对应的定时器为例。假设定时器1与完整的SDU1对应，完整的SDU1共有4个SDU分段，分别为分段1、分段2、分段3和分段4，且完整的SDU1的第一个接收到的SDU分段为分段1。
一种场景：当接收到分段1时，启动定时器1。之后，当在定时器1运行的过程中接收到分段2时，重新启动定时器1。之后，当在定时器1运行的过程中收到分段3时，重新启动定时器1。之后，当在定时器1运行的过程中收到分段4时，将分段1-分段4组装成完整的SDU1传输给PDCP，并停止定时器1。
另一种场景：当接收到分段1时，启动定时器1。之后，当在定时器1运行的过程中接收到分段2时，重新启动定时器1。之后，当在定时器1运行的过程中收到分段3时，重新启动定时器1。之后，当在定时器1运行的过程中未收到分段4时，说明未在定时器1规定的时间范围内接收到完整的SDU1的下一个SDU分段，因此在定时器1超时时将分段1、分段2和分段3丢弃。
综上所述，通过基于一个完整的SDU对应一个定时器的方式实现传输该SDU分段组装成的完整的SDU给PDCP层，可以确保属于同一完整的SDU的SDU分段不会长时间滞留在缓冲中，占用缓冲。
第三种：采用所有SDU分段对应一个定时器的方式实现。如图9所示，具体可以包括以下步骤：
步骤901、在定时器运行过程中，判断是否收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段。
其中，当收到了组装该SDU分段所属的完整的SDU所需的所有SDU分段时，执行步骤902。当未收到组装该SDU分段所属的完整的SDU所需的所有SDU分段时，执行步骤903。该定时器与SDU分段对应。其中，与该定时器对应的SDU分段可以是该RLC PDU中包含的SDU分段，或者也可以是早于该RLC PDU包含的SDU分段之前接收到的SDU分段。
步骤902、进行组装，并将组装成的完整的SDU传输给该PDCP层。
具体的，对组装该SDU分段所属的完整的SDU所需的所有SDU分段进行组装，并将组装成的完整的SDU传输给该PDCP层。
步骤903、当该定时器超时时，将该定时器对应的SDU分段以及早于该定时器对应的SDU分段所接收的SDU分段丢弃。
其中，设置该定时器的目的是为了限制该定时器对应的SDU分段以及早于该定时器对应的SDU分段接收到的SDU分段等待组装的时长。当定时器超时时，可以认为该定时器对应的SDU分段以及早于该定时器对应的SDU分段接收到的SDU分段等待组装的时长过长，因此需要将该定时器对应的SDU分段以及早于该定时器对应的SDU分段所接收的SDU分段丢弃。
可选的，可以有如下两个触发条件来启动该定时器。具体的，启动该定时器的触发条件1可以为：当接收到该RLC PDU时，判断该定时器是否正在运行；当该定时器未运行时确定与该定时器对应的SDU分段为该RLC PDU包含的SDU分段，并启动该定时器。启动该定时器的触发条件2可以为：当该定时器超时时，判断是否存在等待组装的SDU分段；当存在等待组装的SDU分段时，确定该定时器与所有等待组装的SDU分段中最新接收到的SDU分段对应，并启动该定时器。需要说明的是，在实际应用中可以仅使用触发条件1，或者也可以同时使用触发条件1和触发条件2。
以使用触发条件1为例。假设已有5个等待组装的SDU分段，按照接收顺序由早至晚依次为分段1-分段5，分段3与定时器2对应，在定时器2运行过程中接收到了分段4和分段5。当定时器2超时时，将分段1、分段2和分段3丢弃，并在定时器2超时后再接收到SDU分段时，再启动定时器2。
仅使用触发条件1在特殊的场景下会存在等待组装的SDU分段等待时间过长，占 用缓存的时间过长的问题。具体的，当定时器2超时后长时间内不再接收到SDU分段时，会出现分段4和分段5等待组装的时间过长，占用缓存的时间过长的问题。基于此，可以进一步的采用触发条件2的方式。
以使用触发条件2为例，假设已有5个等待组装的SDU分段，按照接收顺序由早至晚依次为分段1-分段5，分段3与定时器2对应，在定时器2运行过程中接收到了分段4和分段5。当定时器2超时时，将分段1、分段2和分段3丢弃，确定定时器2与分段5对应，并启动定时器2。当定时器2超时后长时间内不再接收到SDU分段时，由于确定了定时器2与分段5对应并启动定时器2，因此不会出现分段4和分段5等待组装的时间过长，占用缓存的时间过长的问题。
由于步骤903中在该定时器超时时，将该定时器对应的SDU分段以及早于该定时器对应的SDU分段所接收的SDU分段丢弃之后，晚于该定时器对应的SDU分段接收到的，且与所丢弃的SDU分段属于同一完整的SDU的SDU分段已没有意义。因此当该定时器超时时，还可以将晚于该定时器对应的SDU分段接收到的，且与所丢弃的SDU分段属于同一完整的SDU的SDU分段丢弃，以节省缓存空间。具体的，步骤903之后还可以包括：可选的，当该定时器超时时，将晚于该定时器对应的SDU分段接收到的，且与该定时器对应的SDU分段属于同一完整的SDU的SDU分段丢弃，并将晚于该定时器对应的SDU分段接收到的，且与K个SDU分段中的每一个SDU分段属于同一完整的SDU的SDU分段丢弃；其中，该K个SDU分段为早于该定时器对应的SDU分段所接收的SDU分段，K为大于或等于0的整数。
综上所述，通过基于所有SDU分段对应同一个定时器的方式实现传输该SDU分段组装成的完整的SDU给PDCP层，确保与该定时器对应的SDU分段以及早于该定时器对应的SDU分段所接收到的SDU分段不会长时间滞留在缓冲中，占用缓冲。
本申请实施例提供的数据传输方法，通过接收端判断RLC PDU包含完整的SDU还是SDU分段，并根据判断的结果传输该完整的SDU或该SDU分段组装成的完整的SDU给PDCP层，实现了5G中UM下的RLC层的数据接收。另外，由于接收端直接将完整的SDU传输给PDCP层，避免了RLC层等待进行重排序时带来的处理时延。
图10为本申请又一实施例提供的数据传输方法的流程图。本申请实施例提供了的数据传输方法可以由发送端来执行。如图10所示，本实施例的方法可以包括：
步骤1001、判断待发送的完整的SDU是否需要分段。
其中，当确定待发送的完整的SDU需要分段时，执行步骤1002。当确定待发送的完整的SDU不需要分段时，执行步骤1003。具体的，可以根据MAC层通知的传输机会中指示的可以传输的RLC PDU的大小，判断待发送的完整的SDU是否需要分段。
步骤1002、对该完整的SDU进行分段，将该完整的SDU的SDU分段包含在RLC PDU中，并将该RLC PDU通过MAC层发送出去。
其中，该RLC PDU的RLC包头中包含该完整的SDU的序列号(Sequence Number，SN)。该RLC PDU使用UM进行传输。
步骤1003、将该完整的SDU包含在RLC PDU中，并将该RLC PDU通过MAC层发送出去。
其中，该RLC PDU的RLC包头中不包含该完整的SDU的SN，该RLC PDU使用UM进行传输。第四代移动通信技术(4rd Generation，4G)中SN用于标识RLC PDU在发送端的发送序号，便于接收端进行重排序和重复检测，即如果发送序号小，则代表先发送，接收端RLC层如果需要按序递交，则需要根据SN先做重排序再向PDCP层递交，另外收到序号相同的包证明重复需要丢弃一个再递交。在5G中，接收端RLC层不需要进行重排序和重复检测，RLC层收到完整的SDU，直接递交到PDCP层，所以不再需要SN。而对于SDU分段，递交之前需要组装成完整的SDU，需要识别哪些SDU分段属于同一完整的SDU，所以仍然需要SN标识。
需要说明的是，本实施例描述了图1所示实施例的对侧实现，本实施例中对于相关术语的解释与图1所示实施例中相同，在此不再赘述。
本申请实施例提供的数据传输方法，通过发送端在确定待发送的完整的SDU不需要分段时，将该完整的SDU包含在RLC PDU中，并将该RLC PDU通过MAC层发送出去，且该RLC PDU的RLC包头中不包含该完整的SDU的SN，实现了5G中UM下的RLC层的数据发送。另外，由于包含完整的SDU的RLC PDU的RLC包头中未包含该完整的SDU的SN，因此可以节省传输开销。
图11为本申请又一实施例提供的数据传输方法的流程图。本申请实施例提供了的数据传输方法可以由发送端来执行。如图11所示，本实施例的方法可以包括：
步骤1101、判断待发送的完整的SDU是否需要分段。
其中，当确定待发送的完整的SDU需要分段时，执行步骤1102。当确定待发送的完整的SDU不需要分段时，执行步骤1103。具体的，可以根据MAC层通知的传输机会中指示的可以传输的RLC PDU的大小，判断待发送的完整的SDU是否需要分段。
步骤1102、对该完整的SDU进行分段，将该完整的SDU的SDU分段包含在RLC PDU中，并将该RLC PDU通过MAC层发送出去。
其中，该RLC PDU的RLC包头中可以包含该完整的SDU的序列号(Sequence Number，SN)。该RLC PDU使用UM进行传输。
步骤1103、将该完整的SDU作为RLC PDU。
其中，由于RLC包头的主要目的是为了携带SN，对于完整的SDU，RLC包头中不需要携带SN，因此对于完整的SDU可以不包含RLC包头，因此可以将该完整的SDU作为了RLC PDU。
步骤1104、通知MAC层在MAC PDU的MAC包头中增加用于指示该RLC PDU未包含RLC包头的指示信息，并将该RLC PDU通过该MAC层发送出去。
其中，该MAC PDU包含该RLC PDU，该RLC PDU使用无应答模式UM进行传输。
需要说明的是，本实施例描述了图1所示实施例的对侧实现，本实施例中对于相关术语的解释与图1所示实施例中相同，在此不再赘述。
本申请实施例提供的数据传输方法，通过发送端在确定待发送的完整的SDU不需要分段时，将该完整的SDU作为RLC PDU，通知MAC层在MAC PDU的MAC包头中增加用于指示该RLC PDU未包含RLC包头的指示信息，并将该RLC PDU通过 MAC层发送出去，实现了5G中UM下的RLC层的数据发送。另外，由于包含完整的SDU的RLC PDU未包含RLC包头，因此可以节省传输开销。
图12为本申请一实施例提供的数据传输装置的结构示意图。本实施例提供的装置可以通过软件、硬件或者两者的结合实现成为接收端的部分或者全部。如图12所示，该装置可以包括：接收模块1201，用于接收无线链路控制层协议数据单元RLC PDU；处理模块1202，用于判断接收模块1201接收到的所述RLC PDU包含完整的服务数据单元SDU还是SDU分段，并根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层，所述RLC PDU使用无应答模式UM进行传输。
可选的，处理模块1202判断接收到的所述RLC PDU包含完整的服务数据单元SDU还是SDU分段，具体包括：判断所述RLC PDU中是否包含RLC包头；当所述RLC PDU中未包含RLC包头时，确定所述RLC PDU包含完整的SDU；当所述RLC PDU中包含RLC包头时，确定所述RLC PDU包含SDU分段。
可选的，处理模块1202判断所述RLC PDU是否包含RLC包头，具体包括：根据媒体接入控制MAC PDU的MAC包头中用于指示所述RLC PDU是否包含RLC包头的指示信息，判断所述RLC PDU是否包含RLC包头；其中，所述MAC PDU包含所述RLC PDU。
可选的，当所述RLC PDU包含完整的SDU时，所述RLC PDU的RLC包头中未包含所述完整的SDU的序列号SN。
可选的，处理模块1202具体可以通过如下三种方式实现根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层的功能。
第一种
处理模块1202根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层，具体包括：
当判断的结果为所述RLC包含SDU分段时，按照接收顺序将所述SDU分段放入缓冲窗中，并判断所述缓存窗中是否存储了组装所述SDU分段所属的完整的SDU所需的所有SDU分段，当所述缓存窗中存储了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，并将组装成的完整的SDU传输给所述PDCP层；其中，所述缓冲窗中按照接收顺序存储了最近接收的未能组装成完整的SDU的M个SDU分段M为大于0且小于或等于所述缓冲窗的大小的整数；
当判断的结果为所述RLC PDU包含完整的SDU时，传输所述RLC PDU包含的完整的SDU给所述PDCP层。
可选的，处理模块1202，还用于将所述缓冲窗中用于组装完整的SDU的SDU分段删除，并对所述缓冲窗中剩余的SDU分段按照接收顺序重新排列。
可选的，处理模块1202，还用于当所述缓冲窗中分段数量等于所述缓冲窗的大小时，将所述缓冲窗中最早接收的SDU分段以及与所述最早接收的SDU分段属于同一完整的SDU的其他SDU分段删除，并将所述缓冲窗中剩余的SDU分段按照接收顺序 重新排列。
可选的，处理模块1202，还用于：当所述缓冲窗中最早接收的SDU分段更新时，重启定时器；当所述定时器超时时，将所述缓冲窗中最早接收的N个SDU分段以及与所述N个SDU分段中的每一个SDU分段属于同一完整的SDU的其他SDU分段删除，并将所述缓冲窗中剩余的SDU分段按照接收顺序重新排列，N为大于0且小于或等于所述缓冲窗的大小的整数。
第二种
处理模块1202根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层，具体包括：
当判断的结果为所述RLC包含SDU分段时，在定时器运行过程中，判断是否收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段，当收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，将组装成的完整的SDU传输给所述PDCP层，并停止所述定时器；其中，所述定时器与所述SDU分段所属的完整的SDU对应；
当判断的结果为所述RLC PDU包含完整的SDU时，传输所述RLC PDU包含的完整的SDU给所述PDCP层。
可选的，处理模块1202，还用于当所述定时器超时时，将所述SDU分段以及与所述SDU分段属于同一完整的SDU的SDU分段丢弃。
可选的，处理模块1202，还用于当所述SDU分段为所述SDU分段所属的完整的SDU的第一个接收到的SDU分段时，启动所述定时器。
可选的，处理模块1202，还用于：判断所述定时器是否正在运行；当所述定时器正在运行时，重启所述定时器；当所述定时器未运行时，启动所述定时器。
第三种
处理模块1202根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层，具体包括：
当判断的结果为所述RLC PDU包含SDU分段时，在定时器运行过程中，判断是否收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段，当收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，并将组装成的完整的SDU传输给所述PDCP层；其中，所述定时器与SDU分段对应；
当判断的结果为所述RLC PDU包含完整的SDU时，传输所述RLC PDU包含的完整的SDU给所述PDCP层。
可选的，处理模块1202，还用于：判断所述定时器是否正在运行；当所述定时器未运行时，确定与所述定时器对应的SDU分段为所述RLC PDU包含的SDU分段，并启动所述定时器。
可选的，处理模块1202，还用于当所述定时器超时时，将所述定时器对应的SDU分段以及早于所述定时器对应的SDU分段所接收的SDU分段丢弃。
可选的，处理模块1202还用于：当所述定时器超时时，判断是否存在等待组装的SDU分段；当存在等待组装的SDU分段时，确定所述定时器与所有等待组装的SDU分段中最新接收到的SDU分段对应，并启动所述定时器。
可选的，处理模块1202，还用于当所述定时器超时时，将晚于所述定时器对应的SDU分段接收到的，且与所丢弃的SDU分段属于同一完整的SDU的SDU分段丢弃。
本实施例中提供的数据传输装置，可以用于执行前述图1、图3、图8和图9所示的方法实施例中的任一方法实施例的技术方案，其实现原理和技术效果与方法实施例类似，在此不再赘述。
图13为本申请另一实施例提供的数据传输装置的结构示意图。本实施例提供的装置可以通过软件、硬件或者两者的结合实现成为发送端的部分或者全部。如图13所示，该装置可以包括：处理模块1301，用于判断待发送的完整的服务数据单元SDU是否需要分段，当确定所述完整的SDU不需要分段时，将所述完整的SDU包含在无线链路控制层协议数据单元RLC PDU中，所述RLC PDU的RLC包头中不包含所述完整的SDU的SN；发送模块1302，用于将处理模块1301获得的所述RLC PDU通过媒体接入控制MAC层发送出去，所述RLC PDU使用无应答模式UM进行传输。
本申请还提供一种数据传输系统，包括：本实施例提供的数据传输装置，以及上述图12所示实施例提供的数据传输装置。
本实施例中提供的数据传输装置，可以用于执行前述图10所示方法实施例的技术方案，其实现原理和技术效果与方法实施例类似，在此不再赘述。
本申请还可以提供一种数据传输装置，该装置可以通过软件、硬件或者两者的结合实现成为发送端的部分或者全部。该装置与图13所示装置的结构相同，同样可以包括处理模块和发送模块。其中，处理模块，用于判断待发送的完整的SDU是否需要分段，当所述完整的服务数据单元SDU不需要分段时，将所述完整的SDU作为无线链路控制层协议数据单元RLC PDU；发送模块，用于通知媒体介入控制MAC层在MAC PDU的MAC包头中增加用于指示所述RLC PDU未包含RLC包头的指示信息，并将所述RLC PDU通过所述MAC层发送出去，所述MAC PDU包含所述RLC PDU，所述RLC PDU使用无应答模式UM进行传输。
本申请还提供一种数据传输系统，包括：本实施例提供的数据传输装置，以及上述图12所示实施例提供的数据传输装置。
本实施例中提供的数据传输装置，可以用于执行前述图11所示方法实施例的技术方案，其实现原理和技术效果与方法实施例类似，在此不再赘述。
图14为本申请一实施例提供的接收端的结构示意图，该接收端例如可以为UE或gNB。如图14所示，该接收端可以包括：处理器1401、存储器1402、接收器1403和至少一个通信总线1404。通信总线1404用于实现元件之间的通信连接。存储器1402可能包含高速RAM存储器，也可能还包括非易失性存储NVM，例如至少一个磁盘存储器，存储器1402中可以存储各种程序，用于完成各种处理功能以及实现本实施例的方法步骤。本实施例中的接收器1403可以为相应的具有通信功能和接收信息功能的输入接口，还可以为接收端上的射频模块或者基带模块。
本实施例中，接收器1403，用于接收无线链路控制层协议数据单元RLC PDU；
处理器1401，用于判断所述RLC PDU包含完整的服务数据单元SDU还是SDU分段，并根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层，所述RLC PDU使用无应答模式UM进行传输。
可选的，处理器1401判断所述RLC PDU包含完整的SDU还是SDU分段，具体包括：判断所述RLC PDU中是否包含RLC包头；当所述RLC PDU中未包含RLC包头时，确定所述RLC PDU包含完整的SDU；当所述RLC PDU中包含RLC包头时，确定所述RLC PDU包含SDU分段。
可选的，处理器1401判断所述RLC PDU是否包含RLC包头，具体包括：根据媒体接入控制MAC PDU的MAC包头中用于指示所述RLC PDU是否包含RLC包头的指示信息，判断所述RLC PDU是否包含RLC包头；其中，所述MAC PDU包含所述RLC PDU。
可选的，当所述RLC PDU包含完整的SDU时，所述RLC PDU的RLC包头中未包含所述完整的SDU的序列号SN。
可选的，处理器1401所完成的功能具体可以分为如下三种。
第一种：
可选的，处理器1401根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给PDCP层，具体包括：
当判断的结果为所述RLC包含SDU分段时，按照接收顺序将所述SDU分段放入缓冲窗中，并判断所述缓存窗中是否存储了组装所述SDU分段所属的完整的SDU所需的所有SDU分段，所述缓冲窗中按照接收顺序存储了最近接收的未能组装成完整的SDU的M个SDU分段；当所述缓存窗中存储了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，并将组装成的完整的SDU传输给所述PDCP层，M为大于0且小于或等于所述缓冲窗的大小的整数；
当判断的结果为所述RLC PDU包含完整的SDU时，传输所述RLC PDU包含的完整的SDU给所述PDCP层。
可选的，处理器1401，还用于将所述缓冲窗中用于组装完整的SDU的SDU分段删除，并对所述缓冲窗中剩余的SDU分段按照接收顺序重新排列。
可选的，处理器1401，还用于当所述缓冲窗中分段数量等于所述缓冲窗的大小时，将所述缓冲窗中最早接收的SDU分段以及与所述最早接收的SDU分段属于同一完整的SDU的其他SDU分段删除，并将所述缓冲窗中剩余的SDU分段按照接收顺序重新排列。
可选的，处理器1401还用于：当所述缓冲窗中最早接收的SDU分段更新时，重启定时器；当所述定时器超时时，将所述缓冲窗中最早接收的N个SDU分段以及与所述N个SDU分段中的每一个SDU分段属于同一完整的SDU的其他SDU分段删除，并将所述缓冲窗中剩余的SDU分段按照接收顺序重新排列，N为大于0且小于或等于所述缓冲窗的大小的整数。
第二种：
可选的，处理器1401根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给PDCP层，具体包括：
当判断的结果为所述RLC包含SDU分段时，在定时器运行过程中，判断是否收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段；当收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，将组装成的完整的 SDU传输给所述PDCP层，并停止所述定时器；其中，所述定时器与所述SDU分段所属的完整的SDU对应；
当判断的结果为所述RLC PDU包含完整的SDU时，传输所述RLC PDU包含的完整的SDU给所述PDCP层。
可选的，处理器1401，还用于当所述定时器超时时，将所述SDU分段以及与所述SDU分段属于同一完整的SDU的SDU分段丢弃。
可选的，处理器1401，还用于当所述SDU分段为所述SDU分段所属的完整的SDU的第一个接收到的SDU分段时，启动所述定时器。
可选的，处理器1401，还用于：判断所述定时器是否正在运行；当所述定时器正在运行时，重启所述定时器；当所述定时器未运行时，启动所述定时器。
第三种：
可选的，处理器1401根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给PDCP层，具体包括：
当判断的结果为所述RLC PDU包含SDU分段时，在定时器运行过程中，判断是否收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段；当收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，并将组装成的完整的SDU传输给所述PDCP层；其中，所述定时器与SDU分段对应；
当判断的结果为所述RLC PDU包含完整的SDU时，传输所述RLC PDU包含的完整的SDU给所述PDCP层。
可选的，处理器1401还用于：判断所述定时器是否正在运行；当所述定时器未运行时，确定与所述定时器对应的SDU分段为所述RLC PDU包含的SDU分段，并启动所述定时器。
可选的，处理器1401，还用于当所述定时器超时时，将所述定时器对应的SDU分段以及早于所述定时器对应的SDU分段所接收的SDU分段丢弃。
可选的，处理器1401还用于：
当所述定时器超时时，判断是否存在等待组装的SDU分段；
当存在等待组装的SDU分段时，确定所述定时器与所有等待组装的SDU分段中最新接收到的SDU分段对应，并启动所述定时器。
可选的，处理器1401，还用于当所述定时器超时时，将晚于所述定时器对应的SDU分段接收到的，且与所丢弃的SDU分段属于同一完整的SDU的SDU分段丢弃。
本实施例中提供的接收端，可以用于执行前述图1、图3、图8和图9所示的方法实施例中任一方法实施例的技术方案，其实现原理和技术效果与方法实施例类似，在此不再赘述。
图15为本申请一实施例提供的发送端的结构示意图，该发送端例如可以为UE或gNB。如图15所示，该接收端可以包括：处理器1501、存储器1502、发送器1503和至少一个通信总线1504。通信总线1504用于实现元件之间的通信连接。存储器1502可能包含高速RAM存储器，也可能还包括非易失性存储NVM，例如至少一个磁盘存储器，存储器1502中可以存储各种程序，用于完成各种处理功能以及实现本实施例的方法步骤。本实施例中的发送器1503可以为相应的具有通信功能和接收信息功能的输 出接口，还可以为接收端上的射频模块或者基带模块。
本实施例中，处理器1501，用于判断待发送的完整的服务数据单元SDU是否需要分段，当所述完整的SDU不需要分段时，将所述完整的SDU包含在无线链路控制层协议数据单元RLC PDU中，所述RLC PDU的RLC包头中不包含所述完整的SDU的SN；
发送器1503，用于将所述RLC PDU通过媒体接入控制MAC层发送出去，所述RLC PDU使用无应答模式UM进行传输。
本实施例中提供的发送端，可以用于执行前述图10所示的任一方法实施例的技术方案，其实现原理和技术效果与方法实施例类似，在此不再赘述。
本申请还可以提供一种发送端，该发送端例如可以为UE或gNB。该发送端与图15所示发送端的结构相同。其中，处理器，用于判断待发送的完整的SDU是否需要分段，当所述完整的服务数据单元SDU不需要分段时，将所述完整的SDU作为无线链路控制层协议数据单元RLC PDU，通知媒体介入控制MAC层在MAC PDU的MAC包头中增加用于指示所述RLC PDU未包含RLC包头的指示信息；其中，所述MAC PDU包含所述RLC PDU，所述RLC PDU使用无应答模式UM进行传输；发送器，用于将所述RLC PDU通过所述MAC层发送出去。
本实施例中提供的发送端，可以用于执行前述图11所示的任一方法实施例的技术方案，其实现原理和技术效果与方法实施例类似，在此不再赘述。
本申请还提供一种可读存储介质，可读存储介质中存储有指令，当接收端的至少一个处理器执行该指令时，接收端执行上述图1、图3、图8和图9所示的方法实施例中任一方法实施例提供的数据传输方法。
本申请还提供一种可读存储介质，可读存储介质中存储有指令，当发送端的至少一个处理器执行该指令时，发送端执行上述图10所示方法实施例中提供的数据传输方法。
本申请还提供一种可读存储介质，可读存储介质中存储有指令，当发送端的至少一个处理器执行该指令时，发送端执行上述图11所示方法实施例中提供的数据传输方法。
本申请还提供一种程序产品，该程序产品包括指令，该指令存储在可读存储介质中。接收端的至少一个处理器可以从可读存储介质读取该指令，并执行该指令使得接收端实施上述图1、图3、图8和图9所示的方法实施例中任一方法实施例提供的数据传输方法。
本申请还提供一种程序产品，该程序产品包括指令，该指令存储在可读存储介质中。发送端的至少一个处理器可以从可读存储介质读取该指令，并执行该指令使得发送端实施上述图10所示的方法实施例提供的数据传输方法。
本申请还提供一种程序产品，该程序产品包括指令，该指令存储在可读存储介质中。发送端的至少一个处理器可以从可读存储介质读取该指令，并执行该指令使得发送端实施上述图11所示的方法实施例提供的数据传输方法。
为了减少传输开销，如图16所示，本申请还提供一种数据传输方法，该方法可以 发送端执行，该发送端例如可以为UE或gNB。如图16所示，该方法包括：
步骤1601、确定协议层的协议数据单元PDU，所述PDU包含所述协议层的上一层的PDU的格式指示域。
其中，所述格式指示域用于指示所述上一层的PDU中是否包含特定信息。所述协议层可以为数据汇聚协议层PDCP或者也可以为无线链路控制RLC层。当所述协议层为PDCP时，所述协议层的上一层为服务数据适配协议数据单元SDAP；当所述协议层为RLC时，所述协议层的上一层为PDCP。
可选的，当所述协议层的上一层为SDAP层时，所述特定信息可以为服务质量流标识(QoS flow ID)。其中，该QoS flow ID用于用来对SDAP PDU所属的QoS流进行标识，用于UE或gNB进行识别。例如，当所述格式指示域值为1时，可以表示所述SDAP PDU内包含QoS flow ID；当所述格式指示域值为0的时候，可以表示所述SDAP PDU内不包含QoS flow ID。
可选的，当所述协议层的上一层为SDAP层时，所述特定信息还可以为PDU包头。例如，当所述格式指示域值为1时，可以表示所述SDAP PDU内包含PDU包头；当所述格式指示域值为0的时候，可以表示所述SDAP PDU内不包含PDU包头。
可选的，当所述协议层的上一层为SDAP层时，所述格式指示域具体可以包括在所述协议层的PDU包头中。
可选的，当所述协议层的上一层为PDCP层时，所述特定信息可以为序列号SN。
步骤1602、将所述协议层的PDU通过所述协议层的下一层发送出去。
本申请实施例提供的数据传输方法，由于在某些传输场景下特定信息并不是必须要携带的，通过在协议层的PDU中包括用于指示该协议层的上一层是否包含特定信息的格式指示域，且特定指示信息的长度通常较格式指示域的长度长，从而减小了传输开销。
为了减少传输开销，如图17所示，本申请还提供一种数据传输方法，该方法可以接收端执行，该接收端例如可以为UE或gNB。如图17所示，该方法包括：
步骤1701、确定RLC PDU，所述RLC PDU包含至少一个格式指示域。
其中，所述格式指示域用于指示所述格式指示域对应的指定区域内是否包含特定指示域。其中，所述至少一个格式指示域中的每一个格式指示域分别对应一个指定区域。所述特定指示域包括：丢失包SN号指示域，和/或连续丢失包SN号指示域，和/或SOstart域，和/或SOend域。其中，所述丢失包SN号指示域用来指示丢失的RLC PDU的SN号，所述连续丢失包SN号指示域用来指示连续丢失的RLC PDU的个数。所述SOend域用来指示SDU分段的最后一个字节在完整的SDU中的位置。所述SOstart域用来指示SDU分段的第一个字节在完整的SDU中的位置。
发送端向接收端发送一组RLC PDU之后，当接收端未接收到其中的一个或多个RLC PDU时，需要向发送端发送用于指示哪些SN号对应的SDU未成功接收的RLC PDU。相关技术中，接收端所发送的RLC PDU中依次包括了所有未成功接收的SDU的SN，并且具体为未成功接收某个SDU的SDU分段时，还需要包括该SDU分段对应的SOstart域和SOend域。本实施例中，通过特定指示域包括连续丢失包SN号指示 域，从而可以减少RLC PDU中所包括的SN的个数，例如，SN为SN1-SN10的10个SDU未成功接收，现有技术中RLC PDU中需要包括SN1、SN2、……、SN10，而本申请只需要包括SN1及值为10的连续丢失包SN号指示域。并且，由于某些场景下只需要包含所丢失的SDU的起始SN(例如，SN1)而不需要包含连续丢失包SN号指示域，因此本申请通过格式指示域用于指示该格式指示域对应的指定区域内是否包含连续丢失包SN号指示域，能够进一步减小传输开销。
另外，相关技术中，当未成功接收某个SDU的SDU分段时，需要针对该SDU分段同时指示出SOstart域和SOend域。而在某些场景下并不需要同时指示出SOstart域和SOend域，例如，SDU分段为一个完整的SDU的第一个分段或者SDU分段为一个完整的SDU的最后一个分段。本实施例中，通过指定格式指示域用于指示该格式指示域对应的指定区域内是否包含SOstart域，和/或SOend域，能够进一步减小传输开销。
例如，当所述格式指示域的值为“00”的时候，可以表示与该格式指示域对应的指定区域不包含SOstart域和SOend域。当格式指示域的值为“01”的时候，可以表示与该格式指示域对应的指定区域包含SOstart域但是不包含SOend域，而且当连续丢失包SN号指示域存在的时候，所述SOstart域对应连续丢失包SN号指示域指示的第一个包。当格式指示域的值为“10”的时候，可以指示该格式指示域对应的指定区域不包含SOstart域但包含SOend域，而且当连续丢失包SN号指示域存在的时候，所述SOend域对应连续丢失包SN号指示域指示的最后一个包。当格式指示域的值为“11”的时候，可以指示该格式指示域对应的指定区域同时包含SOstart域和SOend域，而且当连续丢失包SN号指示域存在的时候，所述SOstart域对应连续丢失包SN号指示域指示的第一个包，所述SOend域对应连续丢失包SN号指示域指示的最后一个包。值得注意的是这里并不限定指示域的值和指示内容的绑定关系，只要指示域为不同值的时候，指示的意义不同即可。
步骤1702、将所述RLC PDU通过所述协议层的下一层发送出去。
本申请实施例提供的数据传输方法，通过RLC PDU包含格式指示域，且该格式指示域指示出与该格式指示域对应的指定区域内是否包含特定指示域，避免了不需要携带特定指示域时携带而带来的传输开销，从而减小了传输开销。
本申请还可以提供一种数据传输装置，该装置可以通过软件、硬件或者两者的结合实现成为发送端的部分或者全部。该装置与图13所示装置的结构相同，同样可以包括处理模块和发送模块。其中，处理模块，用于确定协议层的协议数据单元PDU，所述PDU包含所述协议层的上一层的PDU的格式指示域，所述格式指示域用于指示所述上一层的PDU中是否包含特定信息；发送模块，用于将所述协议层的PDU通过所述协议层的下一层发送出去。
可选的，所述协议层为数据汇聚协议层PDCP或者无线链路控制RLC层。
可选的，当所述协议层为PDCP时，所述协议层的上一层为服务数据适配协议数据单元SDAP。
可选的，当所述协议层为RLC时，所述协议层的上一层为PDCP。
可选的，当所述协议层的上一层为SDAP层时，所述特定信息为服务质量流标识 (QoS flow ID)。
可选的，当所述协议层的上一层为SDAP层时，所述特定信息为PDU包头。
可选的，当所述协议层的上一层为SDAP层时，所述格式指示域具体可以包括在所述协议层的PDU包头中。
可选的，当所述协议层的上一层为PDCP层时，所述特定信息为序列号SN。
本实施例中提供的数据传输装置，可以用于执行前述图16所示方法实施例的技术方案，其实现原理和技术效果与方法实施例类似，在此不再赘述。
本申请还可以提供一种数据传输装置，该装置可以通过软件、硬件或者两者的结合实现成为接收端的部分或者全部。该装置与图13所示装置的结构相同，同样可以包括处理模块和发送模块。其中，处理模块，用于确定RLC PDU，所述RLC PDU包含至少一个格式指示域；所述格式指示域用于指示所述格式指示域对应的指定区域内是否包含特定指示域，所述至少一个格式指示域中的每一个格式指示域分别对应一个指定区域；
发送模块，用于将所述RLC PDU通过所述协议层的下一层发送出去。
可选的，所述特定指示域包括：连续丢失包SN号指示域，和/或SOstart域，和/或SOend域。
本实施例中提供的数据传输装置，可以用于执行前述图17所示方法实施例的技术方案，其实现原理和技术效果与方法实施例类似，在此不再赘述。
本申请还可以提供一种发送端，该发送端例如可以为UE或gNB。本实施例的发送端与图15所示发送端的结构相同，同样可以包括：处理器、存储器、发送器和至少一个通信总线。其中，处理器，用于确定协议层的协议数据单元PDU，所述PDU包含所述协议层的上一层的PDU的格式指示域，所述格式指示域用于指示所述上一层的PDU中是否包含特定信息；发送器，用于将所述协议层的PDU通过所述协议层的下一层发送出去。
可选的，所述协议层为数据汇聚协议层PDCP或者无线链路控制RLC层。
可选的，当所述协议层为PDCP时，所述协议层的上一层为服务数据适配协议数据单元SDAP。
可选的，当所述协议层为RLC时，所述协议层的上一层为PDCP。
可选的，当所述协议层的上一层为SDAP层时，所述特定信息为服务质量流标识(QoS flow ID)。
可选的，当所述协议层的上一层为SDAP层时，所述特定信息为PDU包头。
可选的，当所述协议层的上一层为SDAP层时，所述格式指示域具体可以包括在所述协议层的PDU包头中。
可选的，当所述协议层的上一层为PDCP层时，所述特定信息为序列号SN。
本实施例中提供的发送端，可以用于执行前述图16所示方法实施例的技术方案，其实现原理和技术效果与方法实施例类似，在此不再赘述。
本申请还可以提供一种接收端，该接收端例如可以为UE或gNB。本实施例的接收端与图15所示发送端的结构相同，同样可以包括：处理器、存储器、发送器和至少 一个通信总线。其中，处理器，用于确定RLC PDU，所述RLC PDU包含至少一个格式指示域；所述格式指示域用于指示所述格式指示域对应的指定区域内是否包含特定指示域，所述至少一个格式指示域中的每一个格式指示域分别对应一个指定区域；发送器，用于将所述RLC PDU通过所述协议层的下一层发送出去。
可选的，所述特定指示域包括：连续丢失包SN号指示域，和/或SOstart域，和/或SOend域。
本实施例中提供的接收端，可以用于执行前述图17所示方法实施例的技术方案，其实现原理和技术效果与方法实施例类似，在此不再赘述。
本申请还提供一种可读存储介质，可读存储介质中存储有执行指令，当接收端的至少一个处理器执行该执行指令时，发送端执行图16所示方法实施例提供的数据传输方法。
本申请还提供一种可读存储介质，可读存储介质中存储有执行指令，当发送端的至少一个处理器执行该执行指令时，接收端执行图17所示方法实施例提供的数据传输方法。
本申请还提供一种程序产品，该程序产品包括执行指令，该执行指令存储在可读存储介质中。接收端的至少一个处理器可以从可读存储介质读取该执行指令，至少一个处理器执行该执行指令使得发送端实施图16所示方法实施例提供的数据传输方法。
本申请还提供一种程序产品，该程序产品包括执行指令，该执行指令存储在可读存储介质中。发送端的至少一个处理器可以从可读存储介质读取该执行指令，至少一个处理器执行该执行指令使得接收端实施图17所示方法实施例提供的数据传输方法。
本实施例中的发送端和接收端，可以参照图18所示的设备。作为一个例子，该设备可以完成类似于图14中处理器的功能。在图18中，该设备包括处理器1801，发送数据处理器1802，接收数据处理器1803。在图18中，上述处理模块可以是所述处理器1801，并完成相应的功能。上述发送模块可以是图18中发送数据处理器1802，上述接收模块可以是图18中接收数据处理器1803。虽然图中示出了信道编码器、信道解码器，但是可以理解这些模块并不对本实施例构成限制性说明，仅是示意性的。
图19示出本实施例的另一种形式。处理装置1900中包括调制子系统、中央处理子系统、周边子系统等模块。本实施例中的发送端和接收端可以作为其中的调制子系统。具体的，该调制子系统可以包括处理器1901，接口1902。其中处理器1901完成上述处理模块的功能，接口1902完成上述发送模块和/或接收模块的功能。作为另一种变形，该调制子系统包括存储器1903、处理器1901及存储在存储器上并可在处理器上运行的程序，所述处理器执行所述程序时实现上述方法实施例所述方法。需要注意的是，所述存储器1903可以是非易失性的，也可以是易失性的，其位置可以位于调制子系统内部，也可以位于处理装置1900中，只要该存储器1903可以连接到所述处理器1901即可。
在发送端或者接收端的具体实现中，应理解，处理器可以是中央处理单元(英文：Central Processing Unit，简称：CPU)，还可以是其他通用处理器、数字信号处理器(英文：Digital Signal Processor，简称：DSP)、专用集成电路(英文：Application Specific Integrated Circuit，简称：ASIC)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。结合本申请所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
实现上述各方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成。前述的程序可以存储于一可读取存储器中。该程序在执行时，执行包括上述各方法实施例的步骤；而前述的存储器(存储介质)包括：只读存储器(英文：read-only memory，缩写：ROM)、RAM、快闪存储器、硬盘、固态硬盘、磁带(英文：magnetic tape)、软盘(英文：floppy disk)、光盘(英文：optical disc)及其任意组合。

Claims (46)

  1. 一种数据传输方法，其特征在于，包括：
    接收端，接收无线链路控制层协议数据单元RLC PDU；
    所述接收端，判断所述RLC PDU包含完整的服务数据单元SDU还是SDU分段，所述RLC PDU使用无应答模式UM进行传输；
    所述接收端，根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层。
  2. 根据权利要求1所述的方法，其特征在于，所述接收端，判断所述RLC PDU包含完整的SDU还是SDU分段，包括：
    所述接收端，判断所述RLC PDU中是否包含RLC包头；
    当所述RLC PDU中未包含RLC包头时，所述接收端确定所述RLC PDU包含完整的SDU；
    当所述RLC PDU中包含RLC包头时，所述接收端确定所述RLC PDU包含SDU分段。
  3. 根据权利要求1所述的方法，其特征在于，当所述RLC PDU的RLC包头中未包含SDU的序列号SN时，所述RLC PDU包含完整的SDU。
  4. 根据权利要求1-3任一项所述的方法，其特征在于，所述接收端，根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给PDCP层，包括：
    当判断的结果为所述RLC PDU包含完整的SDU时，所述接收端传输所述RLC PDU包含的完整的SDU给所述PDCP层。
  5. 根据权利要求1-3任一项所述的方法，其特征在于，所述接收端，根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给PDCP层，包括：
    当判断的结果为所述RLC PDU包含SDU分段时，判断是否收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段；
    当收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，所述接收端进行组装，将组装成的完整的SDU传输给所述PDCP层。
  6. 根据权利要求1-3任一项所述的方法，其特征在于，所述接收端，根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给PDCP层，包括：
    当判断的结果为所述RLC包含SDU分段时，所述接收端按照接收顺序将所述SDU分段放入缓冲窗中，并判断所述缓存窗中是否存储了组装所述SDU分段所属的完整的SDU所需的所有SDU分段，所述缓冲窗中按照接收顺序存储了最近接收的未能组装成完整的SDU的M个SDU分段；
    当所述缓存窗中存储了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，所述接收端进行组装，并将组装成的完整的SDU传输给所述PDCP层，M为大于0且小于或等于所述缓冲窗的大小的整数；
    当判断的结果为所述RLC PDU包含完整的SDU时，所述接收端传输所述RLC PDU包含的完整的SDU给所述PDCP层。
  7. 根据权利要求6所述的方法，其特征在于，所述接收端按照接收顺序将所述SDU分段放入缓冲窗之前，还包括：
    当所述缓冲窗中分段数量等于所述缓冲窗的大小时，所述接收端将所述缓冲窗中最早接收的SDU分段以及与所述最早接收的SDU分段属于同一完整的SDU的其他SDU分段删除，并将所述缓冲窗中剩余的SDU分段按照接收顺序重新排列。
  8. 根据权利要求1-3任一项所述的方法，其特征在于，所述接收端，根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给PDCP层，包括：
    当判断的结果为所述RLC包含SDU分段时，在定时器运行过程中，所述接收端判断是否收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段；
    当收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，所述接收端进行组装，将组装成的完整的SDU传输给所述PDCP层，并停止所述定时器；其中，所述定时器与所述SDU分段所属的完整的SDU对应；
    当判断的结果为所述RLC PDU包含完整的SDU时，所述接收端传输所述RLC PDU包含的完整的SDU给所述PDCP层。
  9. 根据权利要求8所述的方法，其特征在于，所述方法还包括：
    当所述定时器超时时，所述接收端将所述SDU分段以及与所述SDU分段属于同一完整的SDU的SDU分段丢弃。
  10. 根据权利要求1-3任一项所述的方法，其特征在于，所述接收端，根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给PDCP层，包括：
    当判断的结果为所述RLC PDU包含SDU分段时，在定时器运行过程中，所述接收端判断是否收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段；
    当收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，所述接收端进行组装，并将组装成的完整的SDU传输给所述PDCP层；其中，所述定时器与SDU分段对应；
    当判断的结果为所述RLC PDU包含完整的SDU时，所述接收端传输所述RLC PDU包含的完整的SDU给所述PDCP层。
  11. 根据权利要求10所述的方法，其特征在于，所述方法还包括：
    当所述定时器超时时，所述接收端将所述定时器对应的SDU分段以及早于所述定时器对应的SDU分段所接收的SDU分段丢弃。
  12. 根据权利要求10或11所述的方法，其特征在于，所述方法还包括：
    当所述定时器超时时，所述接收端判断是否存在等待组装的SDU分段；
    当存在等待组装的SDU分段时，所述接收端确定所述定时器与所有等待组装的SDU分段中最新接收到的SDU分段对应，并启动所述定时器。
  13. 一种数据传输方法，其特征在于，包括：
    发送端，判断待发送的完整的服务数据单元SDU是否需要分段；
    当所述完整的SDU不需要分段时，所述发送端将所述完整的SDU包含在无线链路控制层协议数据单元RLC PDU中，所述RLC PDU的RLC包头中不包含所述完整的SDU的SN；
    所述发送端，将所述RLC PDU通过媒体接入控制MAC层发送出去，所述RLC PDU使用无应答模式UM进行传输。
  14. 一种数据传输方法，其特征在于，包括：
    发送端，判断待发送的完整的SDU是否需要分段；
    当所述完整的服务数据单元SDU不需要分段时，所述发送端将所述完整的SDU作为无线链路控制层协议数据单元RLC PDU；
    所述发送端，通知媒体介入控制MAC层在MAC PDU的MAC包头中增加用于指示所述RLC PDU未包含RLC包头的指示信息，并将所述RLC PDU通过所述MAC层发送出去，所述MAC PDU包含所述RLC PDU，所述RLC PDU使用无应答模式UM进行传输。
  15. 一种数据传输装置，其特征在于，包括：
    接收模块，用于接收无线链路控制层协议数据单元RLC PDU；
    处理模块，用于判断所述RLC PDU包含完整的服务数据单元SDU还是SDU分段，并根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层，所述RLC PDU使用无应答模式UM进行传输。
  16. 根据权利要求15所述的装置，其特征在于，所述判断模块判断所述RLC PDU包含完整的服务数据单元SDU还是SDU分段，具体包括：
    判断所述RLC PDU中是否包含RLC包头；当所述RLC PDU中未包含RLC包头时，确定所述RLC PDU包含完整的SDU；当所述RLC PDU中包含RLC包头时，确定所述RLC PDU包含SDU分段。
  17. 根据权利要求15所述的装置，其特征在于，当所述RLC PDU的RLC包头中未包含SDU的序列号SN时，所述RLC PDU包含完整的SDU。
  18. 根据权利要求15-17任一项所述的装置，其特征在于，所述处理模块，根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给PDCP层，包括：
    当判断的结果为所述RLC PDU包含完整的SDU时，所述接收端传输所述RLC PDU包含的完整的SDU给所述PDCP层。
  19. 根据权利要求15-17任一项所述的装置，其特征在于，所述处理模块，根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给PDCP层，包括：
    当判断的结果为所述RLC PDU包含SDU分段时，判断是否收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段；
    当收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，所述接收端进行组装，将组装成的完整的SDU传输给所述PDCP层
  20. 根据权利要求15-17任一项所述的装置，其特征在于，所述处理模块根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给分组数据 汇聚协议PDCP层，具体包括：
    当判断的结果为所述RLC包含SDU分段时，按照接收顺序将所述SDU分段放入缓冲窗中，并判断所述缓存窗中是否存储了组装所述SDU分段所属的完整的SDU所需的所有SDU分段，当所述缓存窗中存储了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，并将组装成的完整的SDU传输给所述PDCP层；其中，所述缓冲窗中按照接收顺序存储了最近接收的未能组装成完整的SDU的M个SDU分段M为大于0且小于或等于所述缓冲窗的大小的整数；
    当判断的结果为所述RLC PDU包含完整的SDU时，传输所述RLC PDU包含的完整的SDU给所述PDCP层。
  21. 根据权利要求20所述的装置，其特征在于，所述处理模块，还用于：
    当所述缓冲窗中分段数量等于所述缓冲窗的大小时，将所述缓冲窗中最早接收的SDU分段以及与所述最早接收的SDU分段属于同一完整的SDU的其他SDU分段删除，并将所述缓冲窗中剩余的SDU分段按照接收顺序重新排列。
  22. 根据权利要求15-17任一项所述的装置，其特征在于，所述处理模块根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层，具体包括：
    当判断的结果为所述RLC包含SDU分段时，在定时器运行过程中，判断是否收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段，当收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，将组装成的完整的SDU传输给所述PDCP层，并停止所述定时器；其中，所述定时器与所述SDU分段所属的完整的SDU对应；
    当判断的结果为所述RLC PDU包含完整的SDU时，传输所述RLC PDU包含的完整的SDU给所述PDCP层。
  23. 根据权利要求22所述的装置，其特征在于，所述处理器模块，还用于当所述定时器超时时，将所述SDU分段以及与所述SDU分段属于同一完整的SDU的SDU分段丢弃。
  24. 根据权利要求15-17任一项所述的装置，其特征在于，所述处理模块根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层，具体包括：
    当判断的结果为所述RLC PDU包含SDU分段时，在定时器运行过程中，判断是否收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段，当收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，并将组装成的完整的SDU传输给所述PDCP层；其中，所述定时器与SDU分段对应；
    当判断的结果为所述RLC PDU包含完整的SDU时，传输所述RLC PDU包含的完整的SDU给所述PDCP层。
  25. 根据权利要求24所述的装置，其特征在于，所述处理模块，还用于当所述定时器超时时，将所述定时器对应的SDU分段以及早于所述定时器对应的SDU分段所接收的SDU分段丢弃。
  26. 根据权利要求24或25所述的装置，其特征在于，所述处理模块还用于：
    当所述定时器超时时，判断是否存在等待组装的SDU分段；当存在等待组装的SDU分段时，确定所述定时器与所有等待组装的SDU分段中最新接收到的SDU分段对应，并启动所述定时器。
  27. 一种数据传输装置，其特征在于，包括：
    处理模块，用于判断待发送的完整的服务数据单元SDU是否需要分段，当所述完整的SDU不需要分段时，将所述完整的SDU包含在无线链路控制层协议数据单元RLC PDU中，所述RLC PDU的RLC包头中不包含所述完整的SDU的SN；
    发送模块，用于将所述RLC PDU通过媒体接入控制MAC层发送出去，所述RLC PDU使用无应答模式UM进行传输。
  28. 一种数据传输装置，其特征在于，包括：
    处理模块，用于判断待发送的完整的SDU是否需要分段，当所述完整的服务数据单元SDU不需要分段时，将所述完整的SDU作为无线链路控制层协议数据单元RLC PDU；
    发送模块，用于通知媒体介入控制MAC层在MAC PDU的MAC包头中增加用于指示所述RLC PDU未包含RLC包头的指示信息，并将所述RLC PDU通过所述MAC层发送出去，所述MAC PDU包含所述RLC PDU，所述RLC PDU使用无应答模式UM进行传输。
  29. 一种接收端，其特征在于，包括：接收器和处理器；
    所述接收器，用于接收无线链路控制层协议数据单元RLC PDU；
    所述处理器，用于判断所述RLC PDU包含完整的服务数据单元SDU还是SDU分段，并根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给分组数据汇聚协议PDCP层，所述RLC PDU使用无应答模式UM进行传输。
  30. 根据权利要求29所述的接收端，其特征在于，所述处理器判断所述RLC PDU包含完整的SDU还是SDU分段，具体包括：
    判断所述RLC PDU中是否包含RLC包头；
    当所述RLC PDU中未包含RLC包头时，确定所述RLC PDU包含完整的SDU；
    当所述RLC PDU中包含RLC包头时，确定所述RLC PDU包含SDU分段。
  31. 根据权利要求29所述的接收端，其特征在于，当所述RLC PDU的RLC包头中未包含SDU的序列号SN时，所述RLC PDU包含完整的SDU。
  32. 根据权利要求29-31任一项所述的接收端，其特征在于，所述处理器，根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给PDCP层，包括：
    当判断的结果为所述RLC PDU包含完整的SDU时，所述接收端传输所述RLC PDU包含的完整的SDU给所述PDCP层。
  33. 根据权利要求29-31任一项所述的接收端，其特征在于，所述处理器，根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给PDCP层，包括：
    当判断的结果为所述RLC PDU包含SDU分段时，判断是否收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段；
    当收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，所述接收端进行组装，将组装成的完整的SDU传输给所述PDCP层
  34. 根据权利要求29-31任一项所述的接收端，其特征在于，所述处理器根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给PDCP层，具体包括：
    当判断的结果为所述RLC包含SDU分段时，按照接收顺序将所述SDU分段放入缓冲窗中，并判断所述缓存窗中是否存储了组装所述SDU分段所属的完整的SDU所需的所有SDU分段，所述缓冲窗中按照接收顺序存储了最近接收的未能组装成完整的SDU的M个SDU分段；当所述缓存窗中存储了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，并将组装成的完整的SDU传输给所述PDCP层，M为大于0且小于或等于所述缓冲窗的大小的整数；
    当判断的结果为所述RLC PDU包含完整的SDU时，传输所述RLC PDU包含的完整的SDU给所述PDCP层。
  35. 根据权利要求34所述的接收端，其特征在于，所述处理器，还用于当所述缓冲窗中分段数量等于所述缓冲窗的大小时，将所述缓冲窗中最早接收的SDU分段以及与所述最早接收的SDU分段属于同一完整的SDU的其他SDU分段删除，并将所述缓冲窗中剩余的SDU分段按照接收顺序重新排列。
  36. 根据权利要求29-31任一项所述的接收端，其特征在于，所述处理器根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给PDCP层，具体包括：
    当判断的结果为所述RLC包含SDU分段时，在定时器运行过程中，判断是否收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段；当收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，将组装成的完整的SDU传输给所述PDCP层，并停止所述定时器；其中，所述定时器与所述SDU分段所属的完整的SDU对应；
    当判断的结果为所述RLC PDU包含完整的SDU时，传输所述RLC PDU包含的完整的SDU给所述PDCP层。
  37. 根据权利要求36所述的接收端，其特征在于，所述处理器，还用于当所述定时器超时时，将所述SDU分段以及与所述SDU分段属于同一完整的SDU的SDU分段丢弃。
  38. 根据权利要求29-31任一项所述的接收端，其特征在于，所述处理器根据判断的结果，传输所述完整的SDU或者所述SDU分段组装成的完整的SDU给PDCP层，具体包括：
    当判断的结果为所述RLC PDU包含SDU分段时，在定时器运行过程中，判断是否收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段；当收到了组装所述SDU分段所属的完整的SDU所需的所有SDU分段时，进行组装，并将组装成的完整的SDU传输给所述PDCP层；其中，所述定时器与SDU分段对应；
    当判断的结果为所述RLC PDU包含完整的SDU时，传输所述RLC PDU包含的完整的SDU给所述PDCP层。
  39. 根据权利要求38所述的接收端，其特征在于，所述处理器，还用于当所述定时器超时时，将所述定时器对应的SDU分段以及早于所述定时器对应的SDU分段所接收的SDU分段丢弃。
  40. 根据权利要求38或39所述的接收端，其特征在于，所述处理器还用于：
    当所述定时器超时时，判断是否存在等待组装的SDU分段；
    当存在等待组装的SDU分段时，确定所述定时器与所有等待组装的SDU分段中最新接收到的SDU分段对应，并启动所述定时器。
  41. 一种发送端，其特征在于，包括：发送器和处理器；
    所述处理器，用于判断待发送的完整的服务数据单元SDU是否需要分段，当所述完整的SDU不需要分段时，将所述完整的SDU包含在无线链路控制层协议数据单元RLC PDU中，所述RLC PDU的RLC包头中不包含所述完整的SDU的SN；
    所述发送器，用于将所述RLC PDU通过媒体接入控制MAC层发送出去，所述RLC PDU使用无应答模式UM进行传输。
  42. 一种发送端，其特征在于，包括：发送器和处理器；
    所述处理器，用于判断待发送的完整的SDU是否需要分段，当所述完整的服务数据单元SDU不需要分段时，将所述完整的SDU作为无线链路控制层协议数据单元RLC PDU，通知媒体介入控制MAC层在MAC PDU的MAC包头中增加用于指示所述RLC PDU未包含RLC包头的指示信息；其中，所述MAC PDU包含所述RLC PDU，所述RLC PDU使用无应答模式UM进行传输；
    所述发送器，用于将所述RLC PDU通过所述MAC层发送出去。
  43. 一种数据传输系统，其特征在于，包括：权利要求27或权利要求28所述的数据传输装置，以及权利要求15-26任一项所述的数据传输装置。
  44. 一种接收端，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程序，其特征在于，所述处理器执行所述程序时实现权利要求1至12中任一项所述方法。
  45. 一种发送端，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程序，其特征在于，所述处理器执行所述程序时实现权利要求13或14所述方法。
  46. 一种计算机可读存储介质，其上存储有指令，其特征在于，该指令被执行时执行权利要求1至14中任一项所述方法。
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CN108810985A (zh) 2018-11-13
RU2019139371A (ru) 2021-06-07
EP4178253A1 (en) 2023-05-10
EP3637843A1 (en) 2020-04-15
US20200077300A1 (en) 2020-03-05
CA3062488A1 (en) 2019-11-26
CN110677878B (zh) 2021-04-09
US10959129B2 (en) 2021-03-23
RU2019139371A3 (zh) 2021-06-30
JP2020520153A (ja) 2020-07-02
EP3637843B1 (en) 2022-09-28

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