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WO2018127225A1 - Procédé de transmission de données, dispositif côté réseau et équipement d'utilisateur - Google Patents

Procédé de transmission de données, dispositif côté réseau et équipement d'utilisateur Download PDF

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Publication number
WO2018127225A1
WO2018127225A1 PCT/CN2018/075572 CN2018075572W WO2018127225A1 WO 2018127225 A1 WO2018127225 A1 WO 2018127225A1 CN 2018075572 W CN2018075572 W CN 2018075572W WO 2018127225 A1 WO2018127225 A1 WO 2018127225A1
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WIPO (PCT)
Prior art keywords
rlc
layer
pdu
rlc pdu
pdcp
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PCT/CN2018/075572
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English (en)
Chinese (zh)
Inventor
刘佳敏
伯特兰皮埃尔
许芳丽
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电信科学技术研究院
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Publication of WO2018127225A1 publication Critical patent/WO2018127225A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1809—Selective-repeat protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks

Definitions

  • the present disclosure relates to the field of communications technologies, and in particular, to a data transmission method, a network side device, and a user equipment.
  • ultra-dense networks in the future development of mobile communication systems, in order to better meet the needs of users and greatly improve network capacity and throughput, more transmission nodes will be introduced, that is, ultra-dense networks in the future.
  • ultra-dense network in order to achieve a high transmission rate, high-frequency small station coverage can be adopted.
  • the high-frequency stations are densely deployed, and the dual-connection or multi-connection technology can be adopted, that is, the UE (User Equipment) obtains data transmission through two or more links.
  • the data transmission between the UE and the eNB is usually through a Packet Data Convergence Protocol (PDCP), and a Radio Link Control (RLC). Layer Control Protocol), MAC (Media Access Control) and PHY (Physical Layer) transmission.
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • Layer Control Protocol Layer Control Protocol
  • MAC Media Access Control
  • PHY Physical Layer
  • PDCP mainly performs security operations and header compression and decompression processing, such as encryption and integrity protection, ROHC (Robust Header Compression) compression and decompression, etc.; RLC mainly completes segmentation and sequential delivery of data and The ARQ (Automatic Repeat Request) data transmission guarantee; the MAC mainly completes the scheduling and the cascade processing of different logical channels and the HARQ (Hybrid Automatic Repeat Request) operation; the PHY completes the transport block into packets and Air port is sent.
  • security operations and header compression and decompression processing such as encryption and integrity protection, ROHC (Robust Header Compression) compression and decompression, etc.
  • RLC mainly completes segmentation and sequential delivery of data and The ARQ (Automatic Repeat Request) data transmission guarantee
  • the MAC mainly completes the scheduling and the cascade processing of different logical channels and the HARQ (Hybrid Automatic Repeat Request) operation
  • the PHY completes the transport block into packets and Air port is sent.
  • user data can be offloaded between different eNBs.
  • each logical channel corresponds to three layers of L2 sub-entities (PDCP, RLC, and MAC).
  • PDCP L2 sub-entities
  • each logical channel has an independent PDCP and RLC layer, and the MAC layer is multiplexed, and the RLC performs direct feedback and retransmission between it and the peer.
  • each logical channel has an independent PDCP layer.
  • Each link under the PDCP layer has its own RLC layer, and the RLC layers of each link independently perform their respective Feedback and retransmission.
  • the present disclosure provides a data transmission method, a network side device, and a user equipment to improve network efficiency.
  • the present disclosure provides a data transmission method, which is applied to a network side, and includes:
  • the packet data convergence protocol PDCP layer processes the received high-level data packet to obtain a PDCP PDU, and sends the PDCP PDU to the RLC-H layer, where each PDCP layer corresponds to at least one RLC-H layer;
  • the RLC-H layer processes the received PDCP PDU to obtain an RLC PDU, and sends the RLC PDU to the RLC-L layer, where each RLC-H layer corresponds to at least one RLC-L layer;
  • the RLC-L layer processes the received RLC PDU, obtains an RLC PDU or an RLC PDU segment, and sends the RLC PDU segment to the MAC layer, where each RLC-L layer corresponds to one MAC layer, and each MAC layer corresponds to at least one RLC-L layer;
  • the MAC layer processes the received RLC PDU or RLC PDU segment to obtain a MAC PDU and sends it to the UE side.
  • each RLC-H layer corresponds to at least two RLC-L layers.
  • the step of sending, by the RLC-H layer, the RLC PDU to the RLC-L layer includes:
  • the RLC-H layer offloads the RLC PDU, and sends the offloaded RLC PDU to at least two RLC-L layers respectively;
  • the RLC-H layer replicates the RLC PDU and sends the copied RLC PDU to at least two RLC-L layers respectively;
  • the RLC-H layer selects one link from at least two links, and sends the RLC PDU to the RLC-L layer corresponding to the selected link.
  • the step of processing, by the PDCP layer, the received high-layer data packet to obtain a PDCP PDU and sending the signal to the RLC-H layer includes:
  • the PDCP layer processes the received high-level data packet to obtain a PDCP SDU, and stores the PDCP SDU in the cache;
  • the PDCP layer obtains a first number of PDCP SDUs from the cache, and processes the first number of PDCP SDUs, where the SN is allocated to the first number of PDCP SDUs to obtain a PDCP. PDU;
  • the PDCP layer sends the PDCP PDU to the RLC-H layer
  • a supplementary step when the second number of MAC PDUs in the MAC PDU corresponding to the first number of PDCP SDUs are sent, return to the pre-processing step.
  • the first quantity is determined in the following manner:
  • the first number N1 ⁇ GBR, where N1 is a positive integer; or
  • the first number N1 ⁇ PBR, where N1 is a positive integer; or
  • the first number N1 x M, where N1 is a positive integer and M is the actual amount of data scheduled for each previous TTI.
  • the step of the RLC-H layer processing the received PDCP PDU, obtaining the RLC PDU, and sending the RLC PDU to the RLC-L layer includes:
  • the RLC-H layer processes the received PDCP PDU, obtains the RLC SDU, and stores the RLC SDU in the cache;
  • the RLC-H layer acquires a third quantity of RLC SDUs from the cache, and processes the third quantity of RLC SDUs, including allocating SNs for the third number of RLC SDUs, Obtain an RLC PDU;
  • the RLC-H layer sends the RLC PDU to the RLC-L layer;
  • Supplementary step returning to the pre-processing step when a fourth number of MAC PDUs in the MAC PDU corresponding to the third number of RLC SDUs are sent.
  • the third quantity is determined in the following manner:
  • the third number N2 x GBR, where N2 is a positive integer; or
  • the third number N2 ⁇ PBR, where N2 is a positive integer; or
  • the third number N2 x M, where N2 is a positive integer and M is the actual amount of data scheduled for each previous TTI.
  • the step of the RLC-L layer processing the received RLC PDU to obtain the RLC PDU or the RLC PDU segment and sending the packet to the MAC layer includes:
  • the RLC-L layer stores the received RLC PDU in a cache
  • the RLC-L layer processes the buffered RLC PDU, obtains an RLC PDU or an RLC PDU segment, and sends the RLC PDU segment to the MAC layer.
  • the data transmission method further includes:
  • the RLC-H layer determines the RLC PDU or RLC PDU segment that needs to be retransmitted in the packet loss status report, and acquires the RLC PDU that needs to be retransmitted. Or RLC PDU segmentation and sent to the RLC-L layer;
  • the MAC layer processes the received RLC PDU or RLC PDU segment that needs to be retransmitted, obtains a MAC PDU, and sends the message to the UE side.
  • the interface information of the RLC PDU or the RLC PDU segment to be retransmitted and/or the RLC-H layer and the RLC-L layer includes information for indicating that the current RLC PDU or the RLC PDU segment is a retransmission packet. mark.
  • each RLC-H layer corresponds to at least two RLC-L layers
  • the step of acquiring the retransmitted RLC PDU or RLC PDU segment and sending to the RLC-L layer includes:
  • the RLC-H layer selects one link from the at least two links that is better than the other links, and sends the RLC PDU to the RLC-L layer corresponding to the selected link.
  • the step of the RLC-L layer transmitting the received RLC PDU or RLC PDU that needs to be retransmitted to the corresponding MAC layer of the network side includes:
  • the RLC-L layer When receiving the RLC PDU or RLC PDU segment that needs to be retransmitted, the RLC-L layer preferentially sends the RLC PDU or RLC PDU segment that needs to be retransmitted to the MAC layer.
  • the data transmission method is applied to a wireless transmission network of a CU-DU architecture, the PDCP layer and the RLC-H layer are located in a CU; the RLC-L layer and a MAC layer are located in a DU; or
  • the data transmission method is applied to a wireless transmission network of an NR dual connectivity or multi-connection architecture, and the PDCP layer and the RLC-H layer are located in the MeNB; or
  • the data transmission method is applied to a wireless transmission network of an NR-LTE interworking architecture, and the PDCP layer and the RLC-H layer are located in an NR MeNB.
  • the present disclosure also provides a data transmission method, which is applied to a UE side, and includes:
  • the MAC layer processes the received MAC PDU, obtains the RLC PDU or the RLC PDU segment, and sends the RLC PDU segment to the corresponding RLC layer, where each RLC layer corresponds to multiple MAC layers;
  • the RLC layer performs comprehensive processing on the received RLC PDUs or RLC PDU segments sent by different MAC layers to obtain a complete RLC PDU, and obtains a PDCP PDU from the complete RLC PDU, and sends the PDCP PDU to the PDCP layer.
  • Each RLC layer corresponds to a PDCP layer, and each PDCP layer corresponds to at least one RLC layer;
  • the PDCP layer processes the received PDCP PDU, obtains the PDCP SDU, and delivers it to the upper layer.
  • the step of the RLC layer performing comprehensive processing on the received RLC PDU or RLC PDU segment sent by different MAC layers includes:
  • the RLC layer sorts the received RLC PDUs or RLC PDU segments sent by different MAC layers, and determines whether there is a packet loss according to the sorting result. When there is a packet loss, the packet is sent to the RLC-H layer on the network side. report.
  • the RLC layer sorts the received RLC PDUs or RLC PDU segments sent by different MAC layers, and the step of determining whether there is packet loss according to the sorting result includes:
  • the RLC layer sorts the received RLC PDU or the RLC PDU segment according to the sequence number of the received RLC PDU or the RLC PDU segment, and determines whether there is an RLC PDU or an RLC PDU segment with a missing sequence number;
  • the present disclosure also provides a data transmission method, which is applied to a UE side, and includes:
  • the PDCP layer processes the received high-level data packet to obtain a PDCP PDU, and sends the PDCP PDU to the RLC layer, where each PDCP layer corresponds to at least one RLC layer;
  • the RLC layer processes the received PDCP PDU to obtain an RLC PDU or an RLC PDU segment, and sends the RLC PDU or the RLC PDU segment to the MAC layer, where each RLC layer corresponds to at least two MAC layers;
  • the MAC layer processes the received RLC PDU or RLC PDU segment to obtain a MAC PDU and sends it to the network side.
  • the data transmission method further includes:
  • the RLC layer receives the packet loss status report fed back by the RLC-H layer on the network side, determines the RLC PDU or RLC PDU segment that needs to be retransmitted in the packet loss status report, and acquires the RLC PDU that needs to be retransmitted. Or RLC PDU segmentation and send to the MAC layer;
  • the MAC layer processes the received RLC PDU or RLC PDU segment that needs to be retransmitted, obtains a MAC PDU, and sends the packet to the network side.
  • the step of acquiring the RLC PDU or the RLC PDU segment that needs to be retransmitted and sending to the MAC layer includes:
  • the RLC layer acquires the link of the latest uplink resource, and sends the retransmitted RLC PDU or RLC PDU segment to the MAC layer corresponding to the link of the latest uplink resource.
  • the disclosure also provides a data transmission method, which is applied to the network side, and includes:
  • the MAC layer processes the received MAC PDU to obtain an RLC PDU or an RLC PDU segment, and sends the segment to the corresponding RLC-L layer, where each MAC layer corresponds to at least one RLC-L layer, and each RLC-L layer Corresponding to a MAC layer;
  • the RLC-L layer transparently transmits the received RLC PDU or RLC PDU segment to the RLC-H layer, where each RLC-H layer corresponds to at least one RLC-L layer;
  • the RLC-H layer processes the received RLC PDU or RLC PDU segment to obtain a complete RLC PDU, and obtains a PDCP PDU from the complete RLC PDU, and sends the PDCP PDU to the PDCP layer, where each RLC -
  • the H layer corresponds to a PDCP layer, and each PDCP layer corresponds to at least one RLC-H layer;
  • the PDCP layer processes the received PDCP PDU, obtains the PDCP SDU, and delivers it to the upper layer.
  • each RLC-H layer corresponds to at least two RLC-L layers, and the RLC-H layer processes the received RLC PDU or RLC PDU segment, and the step of obtaining the complete RLC PDU includes:
  • the RLC-H layer performs comprehensive processing on receiving RLC PDUs or RLC PDU segments sent by different RLC-L layers to obtain a complete RLC PDU.
  • the step of processing, by the RLC-H layer, the received RLC PDU or RLC PDU segment includes:
  • the RLC-H layer sorts the received RLC PDUs or RLC PDU segments sent by the different RLC-L layers, and determines whether there is a packet loss according to the sorting result. When there is a packet loss, the RLC layer sends the packet to the RLC layer on the UE side. Package status report.
  • the RLC-H layer sorts the received RLC PDUs or RLC PDU segments sent by different RLC-L layers, and the step of determining whether there is packet loss according to the sorting result includes:
  • the RLC-H layer sorts the received RLC PDU or the RLC PDU segment according to the received sequence number of the RLC PDU or the RLC PDU segment, and determines whether there is an RLC PDU or an RLC PDU segment with a missing sequence number;
  • the data transmission method is applied to a wireless transmission network of a CU-DU architecture, the PDCP layer and the RLC-H layer are located in a CU; the RLC-L layer and a MAC layer are located in a DU; or
  • the data transmission method is applied to a wireless transmission network of an NR dual connectivity or multi-connection architecture, and the PDCP layer and the RLC-H layer are located in the MeNB; or
  • the data transmission method is applied to a wireless transmission network of an NR-LTE interworking architecture, and the PDCP layer and the RLC-H layer are located in an NR MeNB.
  • the disclosure also provides a network side device, including:
  • the PDCP layer is configured to process the received high-level data packet to obtain a PDCP PDU, and send the PDCP PDU to the RLC-H layer, where each PDCP layer corresponds to at least one RLC-H layer;
  • An RLC-H layer configured to process the received PDCP PDU, obtain an RLC PDU, and send the RLC PDU to at least one RLC-L layer, where each RLC-H layer corresponds to at least one RLC-L layer;
  • the RLC-L layer is configured to process the received RLC PDU, obtain the RLC PDU or the RLC PDU segment, and send the segment to the MAC layer, where each RLC-L layer corresponds to one MAC layer, and each MAC layer corresponds to at least one MAC layer.
  • the MAC layer is configured to process the received RLC PDU or RLC PDU segment to obtain a MAC PDU and send it to the UE side.
  • each RLC-H layer corresponds to at least two RLC-L layers.
  • the RLC-H layer comprises:
  • a first routing module configured to offload the RLC PDU, and send the offloaded RLC PDU to at least two RLC-L layers respectively;
  • a second routing module configured to: replicate the RLC PDU, and send the copied RLC PDU to at least two RLC-L layers respectively;
  • the third routing module is configured to select one link from the at least two links, and send the RLC PDU to the RLC-L layer corresponding to the selected link.
  • the PDCP layer comprises:
  • a first cache module configured to process the received high-level data packet, obtain a PDCP SDU, and store the PDCP SDU in the cache;
  • a first pre-processing module configured to obtain a first number of PDCP SDUs from the cache, and process the first number of PDCP SDUs, including allocating SNs for the first number of PDCP SDUs to obtain PDCP PDUs ;
  • a first sending module configured to send a PDCP PDU to the RLC-H layer
  • a supplementing module configured to control the first pre-processing module and the first sending module to continue to work when a second number of MAC PDUs in the MAC PDU corresponding to the first number of PDCP SDUs are sent.
  • the first quantity is determined in the following manner:
  • the first number N1 ⁇ GBR, where N1 is a positive integer; or
  • the first number N1 ⁇ PBR, where N1 is a positive integer; or
  • the first number N1 x M, where N1 is a positive integer and M is the actual amount of data scheduled for each previous TTI.
  • the RLC-H layer comprises:
  • a second cache module configured to process the received PDCP PDU, obtain an RLC SDU, and store the RLC SDU in a cache;
  • a second pre-processing module configured to acquire a third quantity of RLC SDUs from the cache, and process the third quantity of RLC SDUs, including allocating SNs for the third quantity of RLC SDUs to obtain RLC PDU;
  • a second sending module configured to send the RLC PDU to the RLC-L layer
  • a second supplementing module configured to control the second pre-processing module and the second sending module to continue to work when a fourth number of MAC PDUs in the MAC PDU corresponding to the third number of RLC SDUs are sent.
  • the third quantity is determined in the following manner:
  • the third number N2 x GBR, where N2 is a positive integer; or
  • the third number N2 ⁇ PBR, where N2 is a positive integer; or
  • the third number N2 x M, where N2 is a positive integer and M is the actual amount of data scheduled for each previous TTI.
  • the RLC-L layer comprises:
  • a cache module configured to store the received RLC PDU in a cache
  • a sending module configured to: when the transmission timing of the MAC layer is reached, process the buffered RLC PDU, obtain an RLC PDU or an RLC PDU segment, and send the segment to the MAC layer.
  • the RLC-H layer is further configured to determine, when receiving a packet loss status report fed back by the RLC layer on the UE side, the RLC PDU or the RLC PDU segment that is required to be retransmitted in the packet loss status report. Obtaining the RLC PDU or RLC PDU segment that needs to be retransmitted and sending it to the RLC-L layer;
  • the RLC-L layer is further configured to send the received RLC PDU or RLC PDU segment that needs to be retransmitted to the MAC layer.
  • the MAC layer is further configured to process the received RLC PDU or RLC PDU segment that needs to be retransmitted, obtain a MAC PDU, and send the message to the UE side.
  • the interface information of the RLC PDU or the RLC PDU segment to be retransmitted and/or the RLC-H layer and the RLC-L layer includes information for indicating that the current RLC PDU or the RLC PDU segment is a retransmission packet. mark.
  • each RLC-H layer corresponds to at least two RLC-L layers
  • the RLC-H layer is further configured to select a link with a link condition better than other links from the at least two links, and send the RLC PDU to the RLC-L layer corresponding to the selected link.
  • the RLC-L layer is further configured to: when receiving the RLC PDU or RLC PDU segment that needs to be retransmitted, preferentially send the RLC PDU or RLC PDU segment that needs to be retransmitted to the MAC layer.
  • the network side device is applied to a wireless transmission network of a CU-DU architecture
  • the PDCP layer and the RLC-H layer are located in a CU
  • the RLC-L layer and a MAC layer are located in a DU; or
  • the network side device is applied to a wireless transmission network of an NR dual connectivity or multiple connection architecture, and the PDCP layer and the RLC-H layer are located in the MeNB; or
  • the network side device is applied to a wireless transmission network of an NR-LTE interworking architecture, and the PDCP layer and the RLC-H layer are located in an NR MeNB.
  • the present disclosure also provides a user equipment, including:
  • the MAC layer is configured to process the received MAC PDU, obtain the RLC PDU or the RLC PDU segment, and send the segment to the corresponding RLC layer, where each RLC layer corresponds to multiple MAC layers;
  • the RLC layer is configured to perform comprehensive processing on the received RLC PDUs or RLC PDU segments sent by different MAC layers to obtain a complete RLC PDU, obtain a PDCP PDU from the complete RLC PDU, and send the PDCP PDU to the PDCP layer.
  • each RLC layer corresponds to a PDCP layer
  • each PDCP layer corresponds to at least one RLC layer
  • the PDCP layer is configured to process the received PDCP PDU, obtain the PDCP SDU, and submit it to the upper layer.
  • the RLC layer is further configured to sort the received RLC PDUs or RLC PDU segments sent by different MAC layers, determine whether there is packet loss according to the sorting result, and when there is packet loss, the RLC to the network side
  • the -H layer sends a packet loss status report.
  • the RLC layer is further configured to sort the received RLC PDU or the RLC PDU segment according to the sequence number of the received RLC PDU or the RLC PDU segment, and determine whether there is a RLC PDU with a missing sequence number or RLC PDU segmentation; when there is a RLC PDU or RLC PDU segment with missing sequence number, the reordering timer is started; when the reordering timer expires, the RLC PDU or RLC PDU segment missing from the serial number is still not received. At the time, it is determined that there is a packet loss.
  • the present disclosure also provides a user equipment, including:
  • the PDCP layer is configured to process the received high-level data packet to obtain a PDCP PDU, and send the PDCP PDU to the RLC layer, where each PDCP layer corresponds to at least one RLC layer;
  • An RLC layer configured to process the received PDCP PDU, obtain an RLC PDU or an RLC PDU segment, and send the RLC PDU or the RLC PDU segment to the MAC layer, where each RLC layer corresponds to at least two MAC layers;
  • the MAC layer is configured to process the received RLC PDU or RLC PDU segment to obtain a MAC PDU and send it to the network side.
  • the RLC layer is further configured to: when receiving a packet loss status report fed back by the RLC-H layer on the network side, determine an RLC PDU or RLC PDU segment that is required to be retransmitted in the packet loss status report; Obtain the RLC PDU or RLC PDU segment that needs to be retransmitted, and send it to the MAC layer;
  • the MAC layer is further configured to process the received RLC PDU or RLC PDU segment that needs to be retransmitted, obtain a MAC PDU, and send the MAC PDU to the network side.
  • the RLC layer is further configured to acquire a link of the latest uplink resource, and send the RLC PDU or the RLC PDU segment that needs to be retransmitted to the MAC layer corresponding to the link of the latest uplink resource.
  • the disclosure also provides a network side device, including:
  • the MAC layer is configured to process the received MAC PDU, obtain an RLC PDU or an RLC PDU segment, and send the segment to the corresponding RLC-L layer, where each MAC layer corresponds to at least one RLC-L layer, and each RLC -L layer corresponds to one MAC layer;
  • An RLC-L layer configured to transparently transmit the received RLC PDU or RLC PDU segment to a corresponding RLC-H layer, where each RLC-H layer corresponds to at least one RLC-L layer;
  • the RLC-H layer is configured to process the received RLC PDU or RLC PDU segment to obtain a complete RLC PDU, obtain a PDCP PDU from the complete RLC PDU, and send the PDCP PDU to the PDCP on the network side.
  • a layer where each RLC layer corresponds to a PDCP layer, and each PDCP layer corresponds to at least one RLC-H layer;
  • the PDCP layer is configured to process the received PDCP PDU, obtain the PDCP SDU, and submit it to the upper layer.
  • each RLC-H layer corresponds to at least two RLC-L layers
  • the RLC-H layer is further configured to perform comprehensive processing on RLC PDUs or RLC PDU segments that are sent by different RLC-L layers to obtain a complete RLC PDU.
  • the RLC-H layer is further configured to sort the RLC PDUs or RLC PDU segments that are sent by different RLC-L layers, determine whether there is packet loss according to the sorting result, and when there is packet loss, to the UE
  • the RLC layer on the side sends a packet loss status report.
  • the RLC-H layer is further configured to sort the received RLC PDU or the RLC PDU segment according to the received sequence number of the RLC PDU or the RLC PDU segment, and determine whether there is a RLC with a missing sequence number.
  • PDU or RLC PDU segmentation when there is a RLC PDU or RLC PDU segment with a missing sequence number, the reordering timer is started; when the reordering timer expires, the RLC PDU or RLC PDU with the missing sequence number is still not received.
  • segmenting it is determined that there is a packet loss.
  • the network side device is applied to a wireless transmission network of a CU-DU architecture
  • the PDCP layer and the RLC-H layer are located in a CU
  • the RLC-L layer and a MAC layer are located in a DU; or
  • the network side device is applied to a wireless transmission network of an NR dual connectivity or multiple connection architecture, and the PDCP layer and the RLC-H layer are located in the MeNB; or
  • the network side device is applied to a wireless transmission network of an NR-LTE interworking architecture, and the PDCP layer and the RLC-H layer are located in an NR MeNB.
  • the embodiment of the present disclosure further provides a network side device, including a processor and a memory; wherein the processor is configured to execute the program implementation of the memory storage: the packet data convergence protocol PDCP layer processes the received high-level data packet to obtain a PDCP PDU, and the PDCP PDU is sent to the RLC-H layer, where each PDCP layer corresponds to at least one RLC-H layer; the RLC-H layer processes the received PDCP PDU to obtain an RLC PDU. And sending the RLC PDU to the RLC-L layer, where each RLC-H layer corresponds to at least one RLC-L layer; the RLC-L layer processes the received RLC PDU to obtain an RLC PDU.
  • the packet data convergence protocol PDCP layer processes the received high-level data packet to obtain a PDCP PDU
  • the PDCP PDU is sent to the RLC-H layer, where each PDCP layer corresponds to at least one RLC-H layer
  • the RLC-H layer processes the received PD
  • each RLC-L layer corresponds to one MAC layer
  • each MAC layer corresponds to at least one RLC-L layer
  • the MAC The layer processes the received RLC PDU or RLC PDU segment to obtain a MAC PDU, and sends the MAC PDU to the UE side.
  • An embodiment of the present disclosure further provides a user equipment, including a processor and a memory, where the processor is configured to perform the program implementation of the memory storage: the MAC layer processes the received MAC PDU to obtain an RLC PDU or an RLC PDU. Segmenting, and transmitting the RLC PDU or RLC PDU segment to a corresponding RLC layer, where each RLC layer corresponds to multiple MAC layers; the RLC layer sends RLC PDUs or RLC PDUs to different MAC layers received.
  • the segmentation is integrated to obtain a complete RLC PDU, and the PDCP PDU is obtained from the complete RLC PDU, and the PDCP PDU is sent to the PDCP layer, where each RLC layer corresponds to a PDCP layer, and each PDCP The layer corresponds to at least one RLC layer; the PDCP layer processes the received PDCP PDU, obtains a PDCP SDU, and delivers the PDCP SDU to a higher layer.
  • An embodiment of the present disclosure further provides a user equipment, including a processor and a memory, where the processor is configured to perform a program implementation of the memory storage: the PDCP layer processes the received high-level data packet to obtain a PDCP PDU, and Sending the PDCP PDU to the RLC layer, where each PDCP layer corresponds to at least one RLC layer; the RLC layer processes the received PDCP PDU to obtain an RLC PDU or an RLC PDU segment, and the RLC PDU or The RLC PDU segment is sent to the MAC layer, where each RLC layer corresponds to at least two MAC layers; the MAC layer processes the received RLC PDU or RLC PDU segment to obtain a MAC PDU, and the The MAC PDU is sent to the network side.
  • the processor is configured to perform a program implementation of the memory storage: the PDCP layer processes the received high-level data packet to obtain a PDCP PDU, and Sending the PDCP PDU to the RLC layer, where each PD
  • the embodiment of the present disclosure further provides a network side device, including a processor and a memory; wherein the processor is configured to perform the program implementation of the memory storage: the MAC layer processes the received MAC PDU to obtain an RLC PDU or an RLC PDU.
  • each MAC layer corresponds to at least one RLC-L layer, and each RLC-L layer corresponds to one MAC layer;
  • the RLC-L layer transparently transmits the received RLC PDU or RLC PDU segment to the RLC-H layer, where each RLC-H layer corresponds to at least one RLC-L layer;
  • the RLC-H layer pair receives The RLC PDU or the RLC PDU segment is processed to obtain a complete RLC PDU, and the PDCP PDU is obtained from the complete RLC PDU, and the PDCP PDU is sent to the PDCP layer, where each RLC-H layer corresponds to one
  • the PDCP layer each PDCP layer corresponding to at least one RLC-H layer;
  • the PDCP layer processes the received PDCP PDU, obtains a PDCP SDU, and delivers the PDCP SDU to a higher layer.
  • the embodiment of the present disclosure further provides a computer readable storage medium, where the program is stored on the computer readable storage medium, and the program is implemented by the processor: the packet data convergence protocol PDCP layer performs the received high layer data packet Processing, obtaining a PDCP PDU, and transmitting the PDCP PDU to an RLC-H layer, where each PDCP layer corresponds to at least one RLC-H layer; the RLC-H layer processes the received PDCP PDU, Obtaining an RLC PDU, and sending the RLC PDU to an RLC-L layer, where each RLC-H layer corresponds to at least one RLC-L layer; the RLC-L layer processes the received RLC PDU, Obtaining an RLC PDU or an RLC PDU segment, and sending the RLC PDU or the RLC PDU segment to the MAC layer, where each RLC-L layer corresponds to one MAC layer, and each MAC layer corresponds to at least one RLC-L layer; The MAC layer processes the received RLC PDU or
  • the embodiment of the present disclosure further provides a computer readable storage medium, where the computer readable storage medium stores a program, and when the program is executed by the processor, the MAC layer processes the received MAC PDU to obtain an RLC PDU. Or RLC PDU segmentation, and sending the RLC PDU or RLC PDU segment to a corresponding RLC layer, where each RLC layer corresponds to multiple MAC layers; the RLC layer sends RLCs to different MAC layers received.
  • the PDU or the RLC PDU segment is integrated to obtain a complete RLC PDU, and the PDCP PDU is obtained from the complete RLC PDU, and the PDCP PDU is sent to the PDCP layer, where each RLC layer corresponds to a PDCP layer.
  • Each PDCP layer corresponds to at least one RLC layer; the PDCP layer processes the received PDCP PDU, obtains a PDCP SDU, and delivers the PDCP SDU to a higher layer.
  • the embodiment of the present disclosure further provides a computer readable storage medium, where the program is stored by the processor, and the PDCP layer processes the received high-level data packet to obtain PDCP. And transmitting the PDCP PDU to the RLC layer, where each PDCP layer corresponds to at least one RLC layer; the RLC layer processes the received PDCP PDU to obtain an RLC PDU or an RLC PDU segment, and The RLC PDU or the RLC PDU segment is sent to the MAC layer, where each RLC layer corresponds to at least two MAC layers; the MAC layer processes the received RLC PDU or RLC PDU segment to obtain a MAC PDU. And sending the MAC PDU to the network side.
  • the embodiment of the present disclosure further provides a computer readable storage medium, where the computer readable storage medium stores a program, and when the program is executed by the processor, the MAC layer processes the received MAC PDU to obtain an RLC PDU. Or RLC PDU segmentation, and sending the RLC PDU or RLC PDU segment to a corresponding RLC-L layer, where each MAC layer corresponds to at least one RLC-L layer, and each RLC-L layer corresponds to one MAC layer.
  • the RLC-L layer transparently transmits the received RLC PDU or RLC PDU segment to the RLC-H layer, where each RLC-H layer corresponds to at least one RLC-L layer; the RLC-H layer Processing the received RLC PDU or RLC PDU segment to obtain a complete RLC PDU, and obtaining a PDCP PDU from the complete RLC PDU, and transmitting the PDCP PDU to the PDCP layer, where each RLC-H
  • the layer corresponds to a PDCP layer, and each PDCP layer corresponds to at least one RLC-H layer; the PDCP layer processes the received PDCP PDU, obtains a PDCP SDU, and delivers the PDCP SDU to a higher layer.
  • the RLC-H layer on the network side and the RLC layer on the UE side can comprehensively process the situation on multiple paths, for example, selection of multiple paths, reception and ordering of data on multiple paths, reassembly, state feedback, and retransmission. Thereby improving network efficiency.
  • 1 is a user plane protocol stack in a mobile communication system in the related art
  • FIG. 3 is a schematic flowchart of a data transmission method according to Embodiment 1 of the present disclosure
  • FIG. 4 is a schematic structural diagram of a PDCP PDU
  • FIG. 5 is a schematic diagram of a method for a cache mechanism of a PDCP layer on a network side according to an embodiment of the present disclosure
  • FIG. 6 is a schematic structural diagram of an RLC PDU
  • FIG. 7 is a schematic diagram of a method for a cache mechanism of an RLC-H layer on a network side according to an embodiment of the present disclosure
  • FIG. 8 is a schematic flowchart of a data transmission method according to Embodiment 2 of the present disclosure.
  • FIG. 9 is a schematic flowchart of a data transmission method according to Embodiment 3 of the present disclosure.
  • FIG. 10 is a schematic flowchart diagram of a data transmission method according to Embodiment 4 of the present disclosure.
  • FIG. 11 is a schematic flowchart of a data transmission method according to Embodiment 5 of the present disclosure.
  • FIG. 12 is a schematic flowchart of a data transmission method according to Embodiment 6 of the present disclosure.
  • FIG. 13 is a schematic structural diagram of a wireless transmission network of a CU-DU architecture according to Embodiment 7 of the present disclosure
  • FIG. 14 is a schematic structural diagram of a wireless transmission network of an NR dual-connection or multi-connection architecture according to Embodiment 8 of the present disclosure
  • FIG. 15 is a schematic structural diagram of a wireless transmission network of an NR-LTE interworking architecture according to Embodiment 9 of the present disclosure.
  • FIG. 16 is a structural diagram of a network side device according to Embodiment 10 of the present disclosure.
  • FIG. 17 is a structural diagram of a user equipment according to Embodiment 11 of the present disclosure.
  • the network side device in the embodiment of the present disclosure includes a PDCP layer, an RLC-H layer, an RLC-L layer, and a MAC layer, that is, the RLC layer in the related art is divided into an RLC-H (RLC-High) entity and an RLC-L (RLC). -Low) entity, wherein the RLC-H layer is mainly responsible for data delivery and ARQ (Automatic Repeat Request) data transmission guarantee, and the RLC-L layer is mainly responsible for segmentation and cascading of data.
  • Each PDCP layer corresponds to at least one RLC-H layer
  • each RLC-H layer corresponds to at least one RLC-L layer
  • each RLC-L layer corresponds to one MAC layer
  • each MAC layer corresponds to at least one RLC-L layer.
  • a first embodiment of the present disclosure provides a data transmission method, where the data transmission method is applied to a downlink initial transmission on a network side, where the data transmission method includes:
  • Step 31 The PDCP layer on the network side processes the received high-level data packet to obtain a PDCP PDU (Protocol Data Unit), and sends the packet to the RLC-H layer on the network side, where each PDCP layer corresponds to at least An RLC-H layer;
  • PDCP PDU Protocol Data Unit
  • Step 32 The RLC-H layer processes the received PDCP PDU to obtain an RLC PDU, and sends the RLC PDU to the RLC-L layer on the network side, where each RLC-H layer corresponds to at least one RLC-L.
  • Floor
  • Step 33 The RLC-L layer processes the received RLC PDU to obtain an RLC PDU or an RLC PDU segment, and sends the RLC PDU segment to the MAC layer of the network side, where each RLC-L layer corresponds to one MAC layer, and each a MAC layer corresponding to at least one RLC-L layer;
  • Step 34 The MAC layer processes the received RLC PDU or RLC PDU segment to obtain a MAC PDU, and sends the message to the UE side.
  • each PDCP layer corresponds to one RLC-H layer, that is, the PDCP layer and the RLC-H layer are in one-to-one correspondence, and there is only one RLC-H on each logical channel.
  • each RLC-H layer corresponds to at least two RLC-L layers, that is, each RLC-H corresponds to at least two legs, so that the RLC-H layer can be on multiple paths.
  • the situation is comprehensively processed.
  • the link quality of multiple paths can be comprehensively considered, and the path with the best link quality can be selected to transmit data to transmit the data as soon as possible.
  • the link quality of one of the paths is deteriorated, it is also possible to switch to another path in time to perform remediation, thereby improving the user experience and facilitating the improvement of network efficiency.
  • the PDCP layer is mainly used for security operations and header compression and decompression processing, such as encryption and integrity protection, ROHC (Robust Header Compression) compression and decompression, etc., including:
  • the PDCP processes the received high-level data packet to obtain a PCDP SDU, and encapsulates the PDCP SDU to obtain a PDCP PDU (service data unit).
  • FIG. 4 is a schematic structural diagram of the PDCP PDU, which can be seen from FIG.
  • the PDCP PDU consists of a PDCP SDU and a PDCP header.
  • the PDCP layer has a Discard function for the data packet, that is, when the data packet is still not sent after the Discard timer expires, the data packet needs to be deleted, and the timeout packet has been assigned the PDCP SN.
  • the deletion of the data packet will cause a gap in the entire SN sequence, and an additional mechanism is needed for the sender and the receiver to confirm the matter.
  • the following method is adopted to avoid deleting the data packet to which the PDCP SN has been allocated:
  • the step of the PDCP layer on the network side processing the received high-layer data packet to obtain the PDCP PDU and sending the signal to the RLC-H layer on the network side may include:
  • Cache step 51 The PDCP layer processes the high-level data packet to obtain a PDCP SDU, and stores the PDCP SDU in the cache.
  • Pre-processing step 52 The PDCP layer obtains a first number of PDCP SDUs from the cache, and processes the first number of PDCP SDUs, including allocating SNs for the first number of PDCP SDUs to obtain PDCPs. PDU;
  • Sending step 53 the PDCP layer sends the PDCP PDU to the RLC-H layer;
  • Supplementary step 54 determining whether the second number of MAC PDUs in the MAC PDU corresponding to the first number of PDCP SDUs are sent, if yes, returning to the pre-processing step 52; otherwise, continuing to perform the supplementing step 54.
  • the function of the supplementary step is that once the packet part of the PDCP processing is sent out, the PDCP processing of the remaining data packets in the buffer is continued in the order of first in first out, so that the data packet that has been PDCP processed can be sufficient. Air interface transmission does not affect the transmission rate.
  • the buffering step 51 further includes:
  • the PDCP layer determines whether the PDCP SDU stored in the cache times out, and directly deletes the timeout PDCP SDU stored in the cache when the PDCP SDU stored in the cache times out.
  • the PDCP layer when receiving the high-level data packet, the PDCP layer does not immediately perform the processing of the PDCP layer, but stores the form of a PDCP SDU in the cache, and only stores a small portion of the PDCP stored in the cache.
  • the SDU allocates the SN and sends it to the RLC-H layer. These packets can be quickly transmitted, and then the SNs are allocated to the remaining SDUs in the cache.
  • the data packet can be directly deleted from the cache. Since the data packet stored in the cache is not allocated to the SN, the deletion of the data packet will not cause a gap in the entire SN sequence. There is no longer a need for additional mechanisms for both sender and receiver to confirm this.
  • the first two SNs may be assigned to the first two, and the SNs are sent according to the schedule, and the remaining three are stored in the cache, if in the process, the third If the data packet times out, it can be deleted directly from the cache.
  • the SN number is 3... so that the SN of the PDCP PDU is continuous, and no Gap (gap) needs to be processed.
  • the foregoing first quantity may be determined according to current scheduling information and/or transmission status, and specifically, may be determined in the following manner:
  • the first number N1 ⁇ GBR (guaranteed bit rate), where N1 is a positive integer; or
  • N1 a positive integer
  • M the actual amount of data scheduled for each previous TTI (transmission time interval).
  • the foregoing calculation method can ensure that the first number of data packets processed by the PCDP can satisfy the transmission of the N1 TTIs, and the value of the N1 is determined by the current link quality. If the current link transmission is relatively smooth, the timeout is relatively long. The value of N1 can be larger, and vice versa.
  • the SN of the PDCP PDU is continuous, and no Gap needs to be processed, so that it can be specified in the standard that once the PDCP SN packet is allocated, deletion is not allowed, and the transmission to the peer end must be continued.
  • the RLC-H layer is mainly responsible for data delivery and ARQ (Automatic Repeat Request) data transmission guarantee. Specifically, the allocation of the RLC SN is determined by the transmission window. If it is an AM (acknowledgement mode), it is necessary to consider whether the Polling bit is carried, etc., and finally form an RLC PDU.
  • AM acknowledgement mode
  • the RLC PDU includes one PDCP PDU. Of course, it can also contain several PDCP PDUs. Please refer to Figure 6.
  • the RLC may multiplex the PDCP SN.
  • the RLC-H layer may also perform the foregoing caching mechanism on the data packet, and the deletion of the data packet to which the RLC SN has been allocated is avoided, mainly because when the RLC-H layer has its own independent RLC SN, Equivalent to the RLC SN, the gap is not allowed.
  • the PDCP PDU is not particularly sensitive to the PDCP layer, that is, the PDCP PDU can be It is discarded. At this time, the PDCP may not buffer the data packet.
  • the data packet is received, it is sent to the RLC-H buffer after processing, and a large number of RLC SDUs are buffered by the RLC-H, and a small amount of RLC SDUs are processed.
  • the RLC PDU is obtained and sent to the MAC layer for transmission.
  • the following method may be used to avoid deleting the data packet to which the RLC SN has been allocated:
  • the step of the RLC-H layer processing the received PDCP PDU to obtain the RLC PDU, and sending the RLC PDU to the RLC-L layer on the network side includes:
  • the RLC-H layer processes the received PDCP PDU, obtains an RLC SDU, and stores the RLC SDU in a cache.
  • Preprocessing step 72 The RLC-H layer acquires a third quantity of RLC SDUs from the cache, and processes the third quantity of RLC SDUs, including allocating SNs for the third number of RLC SDUs , get the RLC PDU;
  • Sending step 73 the RLC-H layer sends the RLC PDU to the RLC-L layer;
  • Supplementary step 74 Return to the pre-processing step 72 when a fourth number of MAC PDUs in the MAC PDU corresponding to the third number of RLC SDUs are transmitted.
  • the function of the supplementary step is that once the data packet part processed by the RLC layer is sent out, the RLC layer processing is continued on the remaining data packets in the cache in the order of first in first out, to ensure that the data packet processed by the RLC layer is processed. It can be enough for air to send without affecting the sending rate.
  • the buffering step 71 further includes:
  • the RLC-H layer determines whether the RLC SDU stored in the cache times out, and directly deletes the timeout RLC SDU stored in the cache when the RLC SDU stored in the cache times out.
  • the RLC-H layer when receiving the PDCP PDU, the RLC-H layer does not immediately perform RLC layer processing, but stores it in the cache in the form of RLC SDU, which is only a small part of the data packet stored in the cache.
  • Perform RLC layer processing allocate SN for the small part of the data packet, and send it to the RLC-L layer, the data can be quickly transmitted, and then, in order, the RLC layer is performed on the remaining data packets in the cache. deal with.
  • the data packet can be directly deleted from the cache. Since the data packet stored in the cache is not allocated to the SN, the deletion of the data packet will not cause a gap in the entire SN sequence. There is no longer a need for additional mechanisms for both sender and receiver to confirm this.
  • the foregoing third quantity may be determined according to current scheduling information and/or transmission status, and specifically, may be determined in the following manner:
  • N2 a positive integer
  • M the actual amount of data scheduled for each previous TTI.
  • the foregoing calculation method can ensure that the third number of data packets processed by the RLC can satisfy the transmission of N2 TTIs, and the value of N2 is determined by the current link quality. If the current link transmission is relatively smooth, the timeout is relatively long, N2 The value can be larger, and vice versa.
  • the SN of the RLC PDU is continuous, and no Gap needs to be processed. Therefore, it can be specified in the standard that once the data packet of the RLC SN is allocated, deletion is not allowed, and the peer must continue to be performed. transmission.
  • each RLC-H layer corresponds to at least two RLC-L layers
  • the RLC-H layer has a certain routing mechanism for the path of the data to be sent, and the following sending methods may be used to select which RLC PDU to send to.
  • RLC-L
  • the bearer split transmission means that the RLC-H layer splits the RLC PDU and sends the split RLC PDU to at least two RLC-L layers.
  • the RLC-H layer corresponds to two RLC-L layers, that is, the logical channel corresponding to the RLC-H corresponds to two data delivery paths, and when the two paths have equal rates, the data packets 0 and 2 can be , 4, 6, 8, ... are sent to a path to send packets 1, 3, 5, 7, 9, ... to another path. If the two path rates are relatively large, the transmission and load conditions of the two paths can be considered. In combination with the feedback of the flow control mechanism, the data packets are sent and sent off to ensure that the data can be sent to the peer end as soon as possible.
  • the main feature of the bearer separation transmission mode is that multiple links are transmitted simultaneously, and different data is transmitted.
  • the so-called duplicate transmission means that the RLC-H layer copies the RLC PDU and sends the copied RLC PDU to at least two RLC-L layers.
  • the copy transmission mode is mainly for some important data, or data with high reliability and delay requirements, which can be transmitted simultaneously on two or more links after being copied.
  • the main feature of the copy transmission mode is that multiple links are transmitted simultaneously, and the same data is transmitted.
  • the selective transmission means that the RLC-H layer selects one link from at least two links and sends the RLC PDU to the RLC-L layer corresponding to the selected link.
  • the RLC-H layer may select one of the best link quality transmissions according to the link quality of at least two links.
  • the main feature of the selective transmission method is that most of the time is to select one of the links to transmit.
  • the RLC-L layer is primarily responsible for the segmentation cascading of data.
  • the step of the RLC-L layer processing the received RLC PDU to obtain the RLC PDU or the RLC PDU segment and sending the packet to the MAC layer of the network side includes:
  • the RLC-L layer stores the received RLC PDU in a cache
  • the RLC-L layer processes the buffered RLC PDU, obtains an RLC PDU or an RLC PDU segment, and sends the RLC PDU segment to the MAC layer.
  • the RLC-L layer when the transmission timing of the MAC layer is reached, the RLC-L layer performs appropriate concatenation and segmentation on the RLC PDU according to the resource size scheduled by the MAC layer, and sends the RLC PDU to the MAC layer.
  • the MAC layer mainly performs scheduling and cascading processing and HARQ operations of different logical channels.
  • each MAC layer may correspond to multiple RLC-L layers.
  • data of different logical channels may be multiplexed at the MAC layer, that is, multiple RLC PDUs of different logical channels or RLC PDU segments can be multiplexed into one MAC PDU.
  • the data transmission method may be applied to a wireless transmission network of a CU-DU (Centralized Unit-Distributed Unit) architecture, in which case the PDCP layer and the RLC-H layer are located in a CU; the RLC- The L layer and the MAC layer are located in the DU;
  • CU-DU Centralized Unit-Distributed Unit
  • the data transmission method may be applied to a wireless transmission network of an NR dual connectivity or multi-connection architecture, where the PDCP layer and the RLC-H layer are located in the MeNB;
  • the data transmission method can be applied to a wireless transmission network of an NR (New Radio)-LTE interworking architecture, and the PDCP layer and the RLC-H layer are located in the NR MeNB.
  • NR New Radio
  • the data transmission method of the embodiment of the present disclosure can be implemented inside the 5G system, and across system contents.
  • the UE side device architecture involved in the embodiment of the present disclosure is described below.
  • the UE side device includes a PDCP layer, an RLC layer, and a MAC layer, where each PDCP layer corresponds to at least one RLC layer, and each RLC layer corresponds to multiple MAC layers.
  • a second embodiment of the present disclosure provides a data transmission method, where the data transmission method is applied to downlink reception on a UE side, where the data transmission method includes:
  • Step 81 The MAC layer on the UE side processes the received MAC PDU, and obtains the RLC PDU or the RLC PDU segment, and sends the RLC PDU segment to the corresponding RLC layer, where each RLC layer corresponds to multiple MAC layers;
  • the MAC layer does not distinguish between the RLC PDU or the RLC PDU segment, and performs the same processing, and the MAC layer may obtain the logical channel ID in the RLC PDU or the RLC PDU segment according to the The logical channel ID in the RLC PDU or RLC PDU segment determines the RLC layer to which the RLC PDU or RLC PDU segment belongs.
  • Step 82 The RLC layer performs comprehensive processing on the received RLC PDU or RLC PDU segment sent by different MAC layers to obtain a complete RLC PDU, and obtains a PDCP PDU from the complete RLC PDU, and sends the PDCP PDU to the RLC PDU.
  • a PDCP layer on the UE side where each RLC layer corresponds to a PDCP layer, and each PDCP layer corresponds to at least one RLC layer;
  • the segmentation is performed according to the segmented SN, and the complete RLC PDU is formed according to the segmentation information.
  • the PDCP PDU When the PDCP PDU is sent to the PDCP layer, even if the PDCP PDU is received out of order, it can still be sent.
  • Step 83 The PDCP layer processes the received PDCP PDU to obtain a PDCP SDU, and delivers the PDCP SDU to the upper layer of the UE side.
  • the PDCP layer performs decryption, decompression, and reordering processing on the received PDCP PDU, and after the PDCP SDU is solved from the sequenced data packet, the PDCP SDU is delivered to the upper layer.
  • each RLC layer corresponds to multiple MAC layers
  • the RLC layer may perform comprehensive processing from data on multiple paths, such as receiving ordering, reassembly, and state feedback, thereby improving network efficiency.
  • the step of synthesizing the received RLC PDU or RLC PDU segment by the RLC layer comprises: the RLC layer sorting the received RLC PDU or RLC PDU segment sent by different MAC layers, according to the ordering As a result, it is determined whether there is a packet loss. When there is a packet loss, the packet loss status report is sent to the RLC-H layer on the network side.
  • the one-to-one correspondence between the RLC layer on the UE side and the RLC-H layer on the network side corresponds to the same logical channel, and the ARQ (Automatic Repeat Request) related function is processed.
  • the RLC layer sorts the received RLC PDUs or RLC PDU segments sent by different MAC layers, and the step of determining whether there is packet loss according to the sorting result includes:
  • the RLC layer sorts the received RLC PDU or the RLC PDU segment according to the sequence number of the received RLC PDU or the RLC PDU segment, and determines whether there is an RLC PDU or an RLC PDU segment with a missing sequence number;
  • the UE side may return an acknowledgement (ACK) as needed, and a successful feedback and retransmission process ends.
  • ACK acknowledgement
  • the RLC layer combines the receiving conditions on multiple links to jointly generate feedback and packet loss status reports, thereby improving network efficiency.
  • a third embodiment of the present disclosure provides a data transmission method, where the data transmission method is applied to downlink retransmission on the network side, where the data transmission method includes:
  • Step 91 When receiving the packet loss status report fed back by the RLC layer on the UE side, the RLC-H layer determines the RLC PDU or RLC PDU segment that needs to be retransmitted in the packet loss status report, and obtains the RLC that needs to be retransmitted. Segment the PDU or RLC PDU and send it to the RLC-L layer;
  • Step 92 The RLC-L layer sends the received RLC PDU or RLC PDU segment that needs to be retransmitted to the MAC layer.
  • Step 93 The MAC layer processes the received RLC PDU or RLC PDU segment that needs to be retransmitted, obtains a MAC PDU, and sends the message to the UE side.
  • the RLC-H layer includes the segmentation information of the retransmission packet specified in the packet loss state to form a corresponding RLC PDU segmentation.
  • the interface information of the RLC PDU or the RLC PDU segment to be retransmitted and/or the RLC-H layer and the RLC-L layer is included in the interface information for indicating the current RLC PDU or the RLC PDU.
  • the segment is the tag of the retransmission packet.
  • the label of the retransmission packet may be carried in the interface information of the RLC-H layer and the RLC-L layer, for example, carried in the header of the GTP-U, or may be 1 bit, one value represents the initial transmission packet, and another value Represents a retransmission package.
  • the RLC-H layer acquires the RLC PDU or the RLC PDU segment that needs to be retransmitted, and sends the RLC PDU segment to the RLC-L layer, where the RLC-H layer selects one link status from the at least two links. A link that is superior to other links and sends the RLC PDU to the RLC-L layer corresponding to the selected link.
  • the path with the best link condition is selected for transmission, and the path selection of the initial transmission is not considered.
  • the initial transmission and the retransmission path are selected. Independent process.
  • the step of the RLC-L layer transmitting the received RLC PDU or the RLC PDU that needs to be retransmitted to the corresponding MAC layer of the network side includes: the RLC-L
  • the layer preferentially sends the RLC PDU or RLC PDU segment that needs to be retransmitted to the MAC layer.
  • the RLC-L layer identifies the retransmission packet based on the tag of the retransmission packet.
  • the RLC-H layer when an RLC-H layer corresponds to multiple RLC-L layers, the RLC-H layer can comprehensively process transmissions on multiple links, effectively perform retransmission, and improve user experience. It is also conducive to the improvement of network efficiency.
  • the data transmission method may be applied to a wireless transmission network of a CU-DU architecture.
  • the PDCP layer and the RLC-H layer are located in a CU;
  • the RLC-L layer and the MAC layer are located in a DU;
  • the data transmission method may be applied to a wireless transmission network of an NR dual connectivity or multi-connection architecture, where the PDCP layer and the RLC-H layer are located in the MeNB;
  • the data transmission method can be applied to a wireless transmission network of an NR-LTE interworking architecture, and the PDCP layer and the RLC-H layer are located in the NR MeNB.
  • the data transmission method of the embodiment of the present disclosure can be implemented inside the 5G system, and across system contents.
  • a fourth embodiment of the present disclosure provides a data transmission method, where the data transmission method is applied to an uplink initial transmission on a UE side, where the data transmission method includes:
  • Step 101 The PDCP layer on the UE side processes the received high-level data packet to obtain a PDCP PDU, and sends the PDCP PDU to the RLC layer on the UE side, where each PDCP layer corresponds to at least one RLC layer;
  • Step 102 The RLC layer processes the received PDCP PDU to obtain an RLC PDU or an RLC PDU segment, and sends the RLC PDU or the RLC PDU segment to the MAC layer of the UE side, where each RLC layer corresponds to at least Two MAC layers;
  • the RLC layer performs the processing of the RLC PDU, and may send the corresponding RLC PDU or the RLC PDU segment to the MAC layer for transmission in advance or after the MAC layer transmission resource is obtained.
  • Step 103 The MAC layer processes the received RLC PDU or RLC PDU segment to obtain a MAC PDU, and sends the packet to the network side.
  • each RLC layer corresponds to at least two MAC layers, that is, corresponding to at least two links, so that the RLC layer can select a path with a better link to send data according to the real-time situation of the current link, thereby Improve network efficiency.
  • the step of the RLC layer to send the RLC PDU or the RLC PDU segment to the MAC layer of the UE side may include: the RLC layer selects at least one link from the at least two links that is better than other links. And send the RLC PDU or RLC PDU segment to the MAC layer corresponding to the selected link.
  • a fifth embodiment of the present disclosure provides a data transmission method, where the data transmission method is applied to uplink reception on a network side, where the data transmission method includes:
  • Step 111 The MAC layer on the network side processes the received MAC PDU, obtains an RLC PDU or an RLC PDU segment, and sends the RLC PDU segment to the corresponding RLC-L layer, where each MAC layer corresponds to at least one RLC-L layer. Each RLC-L layer corresponds to one MAC layer;
  • the MAC layer may acquire a logical channel ID in an RLC PDU or an RLC PDU segment, and determine, according to a logical channel ID in the RLC PDU or the RLC PDU segment, an RLC-L layer to which the RLC PDU or the RLC PDU segment belongs. .
  • Step 112 The RLC-L layer transparently transmits the received RLC PDU or RLC PDU segment to the corresponding RLC-H layer, where each RLC-H layer corresponds to at least one RLC-L layer;
  • Step 113 The RLC-H layer processes the received RLC PDU or RLC PDU segment to obtain a complete RLC PDU, and obtains a PDCP PDU from the complete RLC PDU, and sends the PDCP PDU to the network side.
  • a PDCP layer wherein each RLC layer corresponds to a PDCP layer, and each PDCP layer corresponds to at least one RLC-H layer;
  • Step 114 The PDCP layer processes the received PDCP PDU to obtain a PDCP SDU, and delivers the PDCP SDU to the upper layer of the network side.
  • each RLC-H layer corresponds to at least two RLC-L layers, and the RLC-H layer processes the received RLC PDU or RLC PDU segment to obtain a complete RLC PDU.
  • the RLC-H layer performs comprehensive processing on receiving RLC PDUs or RLC PDU segments sent by different RLC-L layers to obtain a complete RLC PDU.
  • the step of synthesizing, by the RLC-H layer, the received RLC PDU or RLC PDU segment sent by different RLC-L layers comprises: sending, by the RLC-H layer, different RLC-L layers received
  • the RLC PDU or the RLC PDU segment is sorted, and the packet loss is judged according to the sorting result.
  • the packet loss status report is sent to the RLC layer of the UE side.
  • the RLC-H layer uniformly processes the receiving states of different paths to form feedback, and sends the packet loss status report to the RLC layer on the UE side, thereby improving network efficiency.
  • the NACK status may be included, or the ACK status may be included at the same time.
  • the RLC-H layer sorts the received RLC PDUs or RLC PDU segments sent by different RLC-L layers, and the step of determining whether there is packet loss according to the sorting result includes:
  • the RLC-H layer sorts the received RLC PDU or the RLC PDU segment according to the received sequence number of the RLC PDU or the RLC PDU segment, and determines whether there is an RLC PDU or a RLC PDU segment with a missing sequence number;
  • the data transmission method of the embodiment of the present disclosure can be applied to various types of wireless transmission networks, for example:
  • the data transmission method may be applied to a wireless transmission network of a CU-DU architecture.
  • the PDCP layer and the RLC-H layer are located in a CU;
  • the RLC-L layer and the MAC layer are located in a DU;
  • the data transmission method may be applied to a wireless transmission network of an NR dual connectivity or multi-connection architecture, in which case the PDCP layer and the RLC-H layer are located in the MeNB; or
  • the data transmission method can be applied to a wireless transmission network of an NR-LTE interworking architecture, in which case the PDCP layer and the RLC-H layer are located in the NR MeNB.
  • a sixth embodiment of the present disclosure provides a data transmission method, where the data transmission method is applied to an uplink retransmission on a UE side, where the data transmission method includes:
  • Step 121 When receiving the packet loss status report fed back by the RLC-H layer on the network side, the RLC layer on the UE side determines the RLC PDU or RLC PDU segment that needs to be retransmitted specified in the packet loss status report; The transmitted RLC PDU or RLC PDU is segmented and sent to the MAC layer;
  • Step 122 The MAC layer processes the received RLC PDU or RLC PDU segment that needs to be retransmitted, obtains a MAC PDU, and sends the MAC PDU to the network side.
  • each RLC layer corresponds to multiple MAC layers, the RLC layer can perform comprehensive processing on the packet loss status on multiple paths, thereby improving network efficiency.
  • the RLC layer acquires an RLC PDU or an RLC PDU segment that needs to be retransmitted, and sends the RLC PDU segment to the MAC layer, where the RLC layer acquires a link of the latest uplink resource, and needs to retransmit the RLC PDU.
  • the RLC PDU segment is sent to the MAC layer corresponding to the link of the latest uplink resource to ensure retransmission delay.
  • the uplink transmission needs to be scheduled, and has a certain delay.
  • the uplink resource is obtained at time t, which is generally used after 4 subframes, that is, t+4. If one of the two paths has obtained the uplink resource, 4 subframes can be used later, and the other has no resources, the first path has the latest uplink resource. If two paths are used, the first uplink resource can be used after 2 subframes, and the second path can be used after 3 subframes (meaning that both are waiting for different durations after receiving the uplink resource), then obviously Still the first path has the most recent upstream resource.
  • a path with higher reliability such as a path with a lower average block error rate or a better link quality, and a RLC PDU or RLC PDU that needs to be retransmitted may also be selected. segment.
  • FIG. 13 is a schematic structural diagram of a CU-DU architecture wireless transmission network according to Embodiment 7 of the present disclosure.
  • a PDCP layer and an RLC-H layer are located in a CU, and RLC The L-layer and the MAC layer are located in the DU.
  • one PDCP layer corresponds to one RLC-H layer
  • one RLC-H layer corresponds to two RLC-L layers, that is, one RLC-H layer corresponds to two legs ( Leg1 and leg2)
  • each RLC-L layer corresponds to one MAC layer.
  • one PDCP layer corresponds to one RLC layer
  • one RLC layer corresponds to two MAC layers (MAC-1 and MAC-2).
  • Step 1311 The PDCP layer of the CU entity processes the received high-level data packet to obtain a PDCP PDU (Protocol Data Unit), and sends the packet to the RLC-H layer.
  • PDCP PDU Protocol Data Unit
  • the PDCP layer may use the foregoing caching mechanism, and when receiving the high-level data packet, the PDCP SDU is stored in the buffer, and only a small number of PDCP SDUs in the buffer are processed by the PDCP layer to obtain the PDCP PDU and sent to the PDCP PDU.
  • the RLC-H layer can also directly process the PDCP layer when it receives the high-level data packet, and send it to the RLC-H layer.
  • the RLC layer and the PDCP layer are in one-to-one correspondence, and all belong to the same logical channel, and in the CU, each logical channel only corresponds to one RLC layer, and the RLC layer is also located at the upper end of the protocol stack, so it can also be called As the RLC-High (RLC-H) layer;
  • Step 1312 The RLC-H layer processes the received PDCP PDU to obtain an RLC PDU, and sends the RLC PDU to the RLC-L layer of the DU entity through the leg1;
  • the RLC-H may also use the foregoing caching mechanism.
  • the RLC SDU is stored in the cache, and only a small number of RLC SDUs in the buffer are processed by the RLC layer to obtain the RLC PDU and sent. Give the RLC-L layer of the DU entity.
  • Step 1313 The RLC-L layer of the DU entity stores the received RLC PDU in the cache.
  • the RLC-L layer processes the buffered RLC PDU to obtain an RLC PDU or
  • the RLC PDU is segmented and sent to the MAC layer.
  • Step 1314 The MAC layer processes the received RLC PDU or RLC PDU segment to obtain a MAC PDU, and sends the message to the UE side.
  • Step 1321 The MAC layer on the UE side processes the received MAC PDU, obtains an RLC PDU or an RLC PDU segment, and sends the segment to the corresponding RLC layer.
  • Step 1322 The RLC layer sorts the received RLC PDU or RLC PDU segments according to the sequence number of the received RLC PDU or RLC PDU segment, obtains a complete RLC PDU, and obtains the complete RLC PDU.
  • the PDCP PDU is sent to the PDCP layer on the UE side.
  • Step 1323 The PDCP layer processes the received PDCP PDU to obtain a PDCP SDU, and submits the PDCP SDU to the upper layer of the UE side.
  • Step 1331 The RLC-H layer of the CU entity of the network side receives the packet loss status report fed back by the RLC layer on the UE side, and determines the RLC PDU or RLC PDU segment that needs to be retransmitted specified in the packet loss status report. Obtain the RLC PDU or RLC PDU segment that needs to be retransmitted, and select one link from the two links with the link condition better than the other links (leg2), and send the RLC PDU to the RLC corresponding to the selected link.
  • -L layer
  • Step 1332 The RLC-L layer preferentially sends the RLC PDU or RLC PDU segment that needs to be retransmitted to the MAC layer when receiving the RLC PDU or RLC PDU segment that needs to be retransmitted.
  • Step 1333 The MAC layer processes the received RLC PDU or RLC PDU segment that needs to be retransmitted, obtains a MAC PDU, and sends the message to the UE side.
  • Step 1341 The PDCP layer on the UE side processes the received high-level data packet to obtain a PDCP PDU, and sends the PDCP PDU to the RLC layer on the UE side.
  • Step 1342 The RLC layer processes the received PDCP PDU to obtain an RLC PDU or an RLC PDU segment, and sends the RLC PDU or the RLC PDU segment to the MAC layer of the UE side.
  • Step 1343 The MAC layer processes the received RLC PDU or RLC PDU segment to obtain a MAC PDU, and sends the packet to the network side.
  • Step 1351 The MAC layer on the network side processes the received MAC PDU, obtains an RLC PDU or an RLC PDU segment, and sends the segment to the corresponding RLC-L layer.
  • Step 1352 The RLC-L layer transparently transmits the received RLC PDU or RLC PDU segment to the corresponding RLC-H layer.
  • Step 1353 The RLC-H layer of the CU entity performs comprehensive processing on receiving RLC PDUs or RLC PDU segments sent by different RLC-L layers, obtains a complete RLC PDU, and obtains a PDCP PDU from the complete RLC PDU. And sending the PDCP PDU to the PDCP layer on the network side; and, in the sorting process, determining whether there is a packet loss according to the sorting result, and sending a packet loss status report to the RLC layer on the UE side when there is a packet loss.
  • Step 1354 The PDCP layer processes the received PDCP PDU to obtain a PDCP SDU, and submits the PDCP SDU to the upper layer of the network side.
  • Step 1361 When receiving the packet loss status report fed back by the RLC-H layer on the network side, the RLC layer on the UE side determines the RLC PDU or RLC PDU segment that needs to be retransmitted specified in the packet loss status report; The transmitted RLC PDU or the RLC PDU is segmented, and the link of the latest uplink resource is obtained, and the RLC PDU or the RLC PDU segment that needs to be retransmitted is sent to the MAC layer corresponding to the link of the latest uplink resource.
  • Step 1362 The MAC layer processes the received RLC PDU or RLC PDU segment that needs to be retransmitted, obtains a MAC PDU, and sends the MAC PDU to the network side.
  • FIG. 14 is a schematic structural diagram of a wireless transmission network of an NR dual-connection or multi-connection architecture according to Embodiment 8 of the present disclosure.
  • the PDCP layer and The RLC-H layer is located in the MeNB, and the MeNB further includes an RLC-L layer and a MAC layer.
  • the SeMB also includes an RLC-L layer and a MAC layer, wherein one PDCP layer corresponds to one RLC-H layer and one RLC.
  • the -H layer corresponds to two RLC-L layers, that is, one RLC-H layer corresponds to two legs, and each RLC-L layer corresponds to one MAC layer.
  • one PDCP layer corresponds to one RLC layer
  • one RLC layer corresponds to two MAC layers (MAC-1 and MAC-2).
  • dual-connection or multi-connection transmission may be performed.
  • dual connectivity is given, and if there are two or more SeNBs, it is regarded as More connections.
  • the dual-connected or multi-connected routing node is RLC-H.
  • the data processing in the embodiment of the present disclosure is similar to the data processing procedure in the foregoing embodiment.
  • the biggest difference is that the PDCP and the RLC-H on the network side are located inside one of the transmission paths MeNB, and the PDCP knows the state of the MeNB most clearly. Convenient, other processes are similar and will not be described in detail here.
  • FIG. 15 is a structural diagram of a wireless transmission network of an NR-LTE interworking architecture according to Embodiment 9 of the present disclosure.
  • the PDCP layer and the RLC- The H layer is located in the MeNB, and the MeNB further includes an RLC-L layer and a MAC layer.
  • the LTE SeMB also includes an RLC-L layer and a MAC layer, wherein one PDCP layer corresponds to one RLC-H layer, and one RLC- The H layer corresponds to two RLC-L layers, that is, one RLC-H layer corresponds to two legs, and each RLC-L layer corresponds to one MAC layer.
  • one PDCP layer corresponds to one RLC layer
  • one RLC layer corresponds to two MAC layers (MAC-1 and MAC-2).
  • the left side is the NR protocol stack
  • the right side is the LTE protocol stack.
  • the LTE protocol stack is explicitly written, and the LTE existing protocol is used.
  • the NR new protocol stack is required.
  • a new LTE SeNB is added, and the structure is similarly added.
  • a new SeNB may be added, that is, a new NR.
  • the SeNB constitutes a multi-connection.
  • the LTE link needs to maintain the existing processing.
  • the LTE link can treat the received data packet as an RLC SDU, and does not need to distinguish the specific data format.
  • the existing LTE protocol can ensure this, and even the LTE link can be configured into the UM mode. There is no need to acknowledge and retransmit the data, and all feedback and retransmissions are performed by the 5G RLC-H.
  • the RLC on the UE side sorts and reassembles the RLC data from multiple paths, and feeds the found packet loss to the network side RLC-H layer, and the RLC-H layer arranges retransmission of the corresponding data and retransmits.
  • the LTE path does not distinguish the type of the packet and processes it in the order of receiving.
  • the high-priority processing of the retransmission packet may not be implemented.
  • the LET path can also perform high priority. Processing. For NR paths, priority handling of retransmitted data is supported.
  • FIG. 16 is a schematic structural diagram of a network side device according to Embodiment 10 of the present disclosure, where the network side device includes:
  • the PDCP layer is configured to process the received high-level data packet to obtain a PDCP PDU, and send the PDCP PDU to the RLC-H layer, where each PDCP layer corresponds to at least one RLC-H layer;
  • An RLC-H layer configured to process the received PDCP PDU, obtain an RLC PDU, and send the RLC PDU to at least one RLC-L layer, where each RLC-H layer corresponds to at least one RLC-L layer;
  • the RLC-L layer is configured to process the received RLC PDU, obtain the RLC PDU or the RLC PDU segment, and send the segment to the MAC layer, where each RLC-L layer corresponds to one MAC layer, and each MAC layer corresponds to at least one MAC layer.
  • the MAC layer is configured to process the received RLC PDU or RLC PDU segment to obtain a MAC PDU and send it to the UE side.
  • each RLC-H layer corresponds to at least two RLC-L layers.
  • the RLC-H layer comprises:
  • a first routing module configured to offload the RLC PDU, and send the offloaded RLC PDU to at least two RLC-L layers respectively;
  • a second routing module configured to: replicate the RLC PDU, and send the copied RLC PDU to at least two RLC-L layers respectively;
  • the third routing module is configured to select one link from the at least two links, and send the RLC PDU to the RLC-L layer corresponding to the selected link.
  • the PDCP layer comprises:
  • a first cache module configured to process the received high-level data packet, obtain a PDCP SDU, and store the PDCP SDU in the cache;
  • a first pre-processing module configured to obtain a first number of PDCP SDUs from the cache, and process the first number of PDCP SDUs, including allocating SNs for the first number of PDCP SDUs to obtain PDCP PDUs ;
  • a first sending module configured to send a PDCP PDU to the RLC-H layer
  • a supplementing module configured to control the first pre-processing module and the first sending module to continue to work when a second number of MAC PDUs in the MAC PDU corresponding to the first number of PDCP SDUs are sent.
  • the first quantity is determined in the following manner:
  • the first number N1 ⁇ GBR, where N1 is a positive integer; or
  • the first number N1 ⁇ PBR, where N1 is a positive integer; or
  • the first number N1 x M, where N1 is a positive integer and M is the actual amount of data scheduled for each previous TTI.
  • the RLC-H layer comprises:
  • a second cache module configured to process the received PDCP PDU, obtain an RLC SDU, and store the RLC SDU in a cache;
  • a second pre-processing module configured to acquire a third quantity of RLC SDUs from the cache, and process the third quantity of RLC SDUs, including allocating SNs for the third quantity of RLC SDUs to obtain RLC PDU;
  • a second sending module configured to send the RLC PDU to the RLC-L layer
  • a second supplementing module configured to control the second pre-processing module and the second sending module to continue to work when a fourth number of MAC PDUs in the MAC PDU corresponding to the third number of RLC SDUs are sent.
  • the third quantity is determined in the following manner:
  • the third number N2 x GBR, where N2 is a positive integer; or
  • the third number N2 ⁇ PBR, where N2 is a positive integer; or
  • the third number N2 x M, where N2 is a positive integer and M is the actual amount of data scheduled for each previous TTI.
  • the RLC-L layer comprises:
  • a cache module configured to store the received RLC PDU in a cache
  • a sending module configured to: when the transmission timing of the MAC layer is reached, process the buffered RLC PDU, obtain an RLC PDU or an RLC PDU segment, and send the segment to the MAC layer.
  • the RLC-H layer is further configured to determine, when receiving a packet loss status report fed back by the RLC layer on the UE side, the RLC PDU or the RLC PDU segment that is required to be retransmitted in the packet loss status report. Obtaining the RLC PDU or RLC PDU segment that needs to be retransmitted and sending it to the RLC-L layer;
  • the RLC-L layer is further configured to send the received RLC PDU or RLC PDU segment that needs to be retransmitted to the MAC layer.
  • the MAC layer is further configured to process the received RLC PDU or RLC PDU segment that needs to be retransmitted, obtain a MAC PDU, and send the message to the UE side.
  • the interface information of the RLC PDU or the RLC PDU segment to be retransmitted and/or the RLC-H layer and the RLC-L layer includes information for indicating that the current RLC PDU or the RLC PDU segment is a retransmission packet. mark.
  • each RLC-H layer corresponds to at least two RLC-L layers
  • the RLC-H layer is further configured to select a link with a link condition better than other links from the at least two links, and send the RLC PDU to the RLC-L layer corresponding to the selected link.
  • the RLC-L layer is further configured to: when receiving the RLC PDU or RLC PDU segment that needs to be retransmitted, preferentially send the RLC PDU or RLC PDU segment that needs to be retransmitted to the MAC layer.
  • the network side device is applied to a wireless transmission network of a CU-DU architecture
  • the PDCP layer and the RLC-H layer are located in a CU
  • the RLC-L layer and a MAC layer are located in a DU; or
  • the network side device is applied to a wireless transmission network of an NR dual connectivity or multiple connection architecture, and the PDCP layer and the RLC-H layer are located in the MeNB; or
  • the network side device is applied to a wireless transmission network of an NR-LTE interworking architecture, and the PDCP layer and the RLC-H layer are located in an NR MeNB.
  • FIG. 17 is a schematic structural diagram of a user equipment according to Embodiment 11 of the present disclosure, where the user equipment includes:
  • the MAC layer is configured to process the received MAC PDU, obtain the RLC PDU or the RLC PDU segment, and send the segment to the corresponding RLC layer, where each RLC layer corresponds to multiple MAC layers;
  • the RLC layer is configured to perform comprehensive processing on the received RLC PDUs or RLC PDU segments sent by different MAC layers to obtain a complete RLC PDU, obtain a PDCP PDU from the complete RLC PDU, and send the PDCP PDU to the PDCP layer.
  • each RLC layer corresponds to a PDCP layer
  • each PDCP layer corresponds to at least one RLC layer
  • the PDCP layer is configured to process the received PDCP PDU, obtain the PDCP SDU, and submit it to the upper layer.
  • the RLC layer is further configured to sort the received RLC PDUs or RLC PDU segments sent by different MAC layers, determine whether there is packet loss according to the sorting result, and when there is packet loss, the RLC to the network side
  • the -H layer sends a packet loss status report.
  • the RLC layer is further configured to sort the received RLC PDU or the RLC PDU segment according to the sequence number of the received RLC PDU or the RLC PDU segment, and determine whether there is a RLC PDU with a missing sequence number or RLC PDU segmentation; when there is a RLC PDU or RLC PDU segment with missing sequence number, the reordering timer is started; when the reordering timer expires, the RLC PDU or RLC PDU segment missing from the serial number is still not received. At the time, it is determined that there is a packet loss.
  • the PDCP layer is configured to process the received high-level data packet to obtain a PDCP PDU, and send the PDCP PDU to the RLC layer, where each PDCP layer corresponds to at least one RLC layer;
  • An RLC layer configured to process the received PDCP PDU, obtain an RLC PDU or an RLC PDU segment, and send the RLC PDU or the RLC PDU segment to the MAC layer, where each RLC layer corresponds to at least two MAC layers;
  • the MAC layer is configured to process the received RLC PDU or RLC PDU segment to obtain a MAC PDU and send it to the network side.
  • the RLC layer is further configured to: when receiving a packet loss status report fed back by the RLC-H layer on the network side, determine an RLC PDU or RLC PDU segment that is required to be retransmitted in the packet loss status report; Obtain the RLC PDU or RLC PDU segment that needs to be retransmitted, and send it to the MAC layer;
  • the MAC layer is further configured to process the received RLC PDU or RLC PDU segment that needs to be retransmitted, obtain a MAC PDU, and send the MAC PDU to the network side.
  • the RLC layer is further configured to acquire a link of the latest uplink resource, and send the RLC PDU or the RLC PDU segment that needs to be retransmitted to the MAC layer corresponding to the link of the latest uplink resource.
  • the MAC layer is configured to process the received MAC PDU, obtain an RLC PDU or an RLC PDU segment, and send the segment to the corresponding RLC-L layer, where each MAC layer corresponds to at least one RLC-L layer, and each RLC -L layer corresponds to one MAC layer;
  • An RLC-L layer configured to transparently transmit the received RLC PDU or RLC PDU segment to a corresponding RLC-H layer, where each RLC-H layer corresponds to at least one RLC-L layer;
  • the RLC-H layer is configured to process the received RLC PDU or RLC PDU segment to obtain a complete RLC PDU, obtain a PDCP PDU from the complete RLC PDU, and send the PDCP PDU to the PDCP on the network side.
  • a layer where each RLC layer corresponds to a PDCP layer, and each PDCP layer corresponds to at least one RLC-H layer;
  • the PDCP layer is configured to process the received PDCP PDU, obtain the PDCP SDU, and submit it to the upper layer.
  • each RLC-H layer corresponds to at least two RLC-L layers
  • the RLC-H layer is further configured to perform comprehensive processing on RLC PDUs or RLC PDU segments that are sent by different RLC-L layers to obtain a complete RLC PDU.
  • the RLC-H layer is further configured to sort the RLC PDUs or RLC PDU segments that are sent by different RLC-L layers, determine whether there is packet loss according to the sorting result, and when there is packet loss, to the UE
  • the RLC layer on the side sends a packet loss status report.
  • the RLC-H layer is further configured to sort the received RLC PDU or the RLC PDU segment according to the received sequence number of the RLC PDU or the RLC PDU segment, and determine whether there is a RLC with a missing sequence number.
  • PDU or RLC PDU segmentation when there is a RLC PDU or RLC PDU segment with a missing sequence number, the reordering timer is started; when the reordering timer expires, the RLC PDU or RLC PDU with the missing sequence number is still not received.
  • segmenting it is determined that there is a packet loss.
  • the network side device is applied to a wireless transmission network of a CU-DU architecture
  • the PDCP layer and the RLC-H layer are located in a CU
  • the RLC-L layer and a MAC layer are located in a DU; or
  • the network side device is applied to a wireless transmission network of an NR dual connectivity or multiple connection architecture, and the PDCP layer and the RLC-H layer are located in the MeNB; or
  • the network side device is applied to a wireless transmission network of an NR-LTE interworking architecture, and the PDCP layer and the RLC-H layer are located in an NR MeNB.
  • Embodiment 14 of the present disclosure provides a data processing apparatus including: a processor; and a memory connected to the processor through a bus interface, the memory being used to store a memory used by the processor when performing an operation Programs and data, when the processor calls and executes the programs and data stored in the memory, includes functional modules or units that implement the following:
  • the PDCP layer is configured to process the received high-level data packet to obtain a PDCP PDU, and send the PDCP PDU to the RLC-H layer, where each PDCP layer corresponds to at least one RLC-H layer;
  • An RLC-H layer configured to process the received PDCP PDU, obtain an RLC PDU, and send the RLC PDU to at least one RLC-L layer, where each RLC-H layer corresponds to at least one RLC-L layer;
  • the RLC-L layer is configured to process the received RLC PDU, obtain the RLC PDU or the RLC PDU segment, and send the segment to the MAC layer, where each RLC-L layer corresponds to one MAC layer, and each MAC layer corresponds to at least one MAC layer.
  • the MAC layer is configured to process the received RLC PDU or RLC PDU segment to obtain a MAC PDU and send it to the UE side.
  • Embodiment 15 of the present disclosure provides a data processing apparatus including: a processor; and a memory connected to the processor through a bus interface, the memory being used to store a memory used by the processor when performing an operation Programs and data, when the processor calls and executes the programs and data stored in the memory, includes functional modules or units that implement the following:
  • the MAC layer is configured to process the received MAC PDU, obtain the RLC PDU or the RLC PDU segment, and send the segment to the corresponding RLC layer, where each RLC layer corresponds to multiple MAC layers;
  • the RLC layer is configured to perform comprehensive processing on the received RLC PDUs or RLC PDU segments sent by different MAC layers to obtain a complete RLC PDU, obtain a PDCP PDU from the complete RLC PDU, and send the PDCP PDU to the PDCP layer.
  • each RLC layer corresponds to a PDCP layer
  • each PDCP layer corresponds to at least one RLC layer
  • the PDCP layer is configured to process the received PDCP PDU, obtain the PDCP SDU, and submit it to the upper layer.
  • Embodiment 16 of the present disclosure provides a data processing apparatus including: a processor; and a memory connected to the processor through a bus interface, the memory being used to store a memory used by the processor when performing an operation Programs and data, when the processor calls and executes the programs and data stored in the memory, includes functional modules or units that implement the following:
  • the PDCP layer is configured to process the received high-level data packet to obtain a PDCP PDU, and send the PDCP PDU to the RLC layer, where each PDCP layer corresponds to at least one RLC layer;
  • An RLC layer configured to process the received PDCP PDU, obtain an RLC PDU or an RLC PDU segment, and send the RLC PDU or the RLC PDU segment to the MAC layer, where each RLC layer corresponds to at least two MAC layers;
  • the MAC layer is configured to process the received RLC PDU or RLC PDU segment to obtain a MAC PDU and send it to the network side.
  • Embodiment 17 of the present disclosure provides a data processing apparatus comprising: a processor; and a memory connected to the processor through a bus interface, the memory being used to store a memory used by the processor when performing an operation Programs and data, when the processor calls and executes the programs and data stored in the memory, includes functional modules or units that implement the following:
  • the MAC layer is configured to process the received MAC PDU, obtain an RLC PDU or an RLC PDU segment, and send the segment to the corresponding RLC-L layer, where each MAC layer corresponds to at least one RLC-L layer, and each RLC -L layer corresponds to one MAC layer;
  • An RLC-L layer configured to transparently transmit the received RLC PDU or RLC PDU segment to a corresponding RLC-H layer, where each RLC-H layer corresponds to at least one RLC-L layer;
  • the RLC-H layer is configured to process the received RLC PDU or RLC PDU segment to obtain a complete RLC PDU, obtain a PDCP PDU from the complete RLC PDU, and send the PDCP PDU to the PDCP on the network side.
  • a layer where each RLC layer corresponds to a PDCP layer, and each PDCP layer corresponds to at least one RLC-H layer;
  • the PDCP layer is configured to process the received PDCP PDU, obtain the PDCP SDU, and submit it to the upper layer.
  • the apparatus provided by the fourteenth, fifteenth, sixteenth and seventeenth embodiments of the present disclosure is a device capable of corresponding to the data transmission method provided by the foregoing method embodiment, and therefore the data transmission method provided by the foregoing method embodiment All of the embodiments can be applied to the fourteenth, fifteenth, sixteenth and seventeenth embodiments, and all of the same or similar benefits can be achieved.
  • the disclosed method and apparatus may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • each functional unit in various embodiments of the present disclosure may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium.
  • the above software functional unit is stored in a storage medium and includes a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform part of the steps of the transceiving method of the various embodiments of the present disclosure.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, and the program code can be stored. Medium.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de transmission de données, un dispositif côté réseau et un équipement d'utilisateur. Le procédé de transmission de données comporte les étapes suivantes: une couche PDCP sur un côté réseau traite un paquet de données de couche supérieure pour obtenir une PDU PDCP et l'envoie à une couche RLC-H, chaque couche PDCP correspondant à au moins une couche RLC-H; la couche RLC-H traite la PDU PDCP reçue, de façon à obtenir une PDU RLC, et envoie la PDU RLC à une couche RLC-L, chaque couche RLC-H correspondant à au moins une couche RLC-L; la couche RLC-L traite la PDU RLC reçue, de façon à obtenir une PDU RLC ou un segment de PDU RLC et l'envoie à une couche MAC, chaque couche RLC-L correspondant à une couche MAC; et la couche MAC traite la PDU RLC ou le segment de PDU RLC reçus, de façon à obtenir une PDU MAC et envoie la PDU MAC à un côté UE.
PCT/CN2018/075572 2017-01-05 2018-02-07 Procédé de transmission de données, dispositif côté réseau et équipement d'utilisateur WO2018127225A1 (fr)

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CN115606230A (zh) * 2020-07-31 2023-01-13 Oppo广东移动通信有限公司（Cn） 层二测量量增强表示和报告方法及设备
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