WO2017177785A1 - Procédé et appareil de retransmission de données - Google Patents

Procédé et appareil de retransmission de données Download PDF

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Publication number
WO2017177785A1
WO2017177785A1 PCT/CN2017/076800 CN2017076800W WO2017177785A1 WO 2017177785 A1 WO2017177785 A1 WO 2017177785A1 CN 2017076800 W CN2017076800 W CN 2017076800W WO 2017177785 A1 WO2017177785 A1 WO 2017177785A1
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Prior art keywords
protocol entity
wireless carrier
upper layer
layer protocol
data packet
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English (en)
Chinese (zh)
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王昕�
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
    • H04W28/0242—Determining whether packet losses are due to overload or to deterioration of radio communication conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1858—Transmission or retransmission of more than one copy of acknowledgement message
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/142—Reselecting a network or an air interface over the same radio air interface technology

Definitions

  • the present application relates to, but is not limited to, the field of mobile communication technologies, and in particular, to a data retransmission method and apparatus.
  • the 5G network strives to achieve an order of magnitude increase in data capacity and transmission speed compared to the 4G network, and can be applied to various scenarios, support various architectures, and be compatible with various terminals at a low cost.
  • superior performance also means that the deployment of 5G networks will become more complicated.
  • the SeNB may be capable of supporting one or more of a plurality of frequency carriers and a plurality of radio access technologies (RATs), or supporting different carriers or RATs.
  • RATs radio access technologies
  • a high-performance interface (such as an ideal backhaul) is built between the SeNBs.
  • the 5G network hopes that the user experience can be as non-aware as possible during the service link replacement, that is, the data throughput will not be greatly reduced. Therefore, how to minimize the loss of the underlying data packet and realize the fast retransmission of the data packet in the process of service link replacement is an urgent problem to be solved.
  • the wireless signal coverage of the small station node is much smaller than that of the macro base station.
  • the deployment environment of the communication network is more complicated, such as various occlusions on the communication path and rapid movement of user equipment, etc., the wireless interface between the serving base station and the user equipment is caused. Signal quality fluctuates frequently, resulting in one or more of more frequent transmission link changes and service node handovers.
  • the signal quality measurement, the corresponding resource allocation and the mobility decision of the wireless interface basically have two levels on the wireless protocol stack:
  • Hybrid Automatic Repeat Request Hybrid Automatic Repeat Request
  • the HARQ Hybrid Automatic Repeat Request
  • RLC Radio Link Control
  • the other is a high-level (mainly referred to as a Radio Resource Control (RRC) entity) that measures the quality of the radio interface signal obtained by interacting with the reported control plane signaling.
  • RRC Radio Resource Control
  • This measurement requires a long execution time, reflecting It is the average signal quality of the wireless interface over a period of time.
  • the access network node configured with the RRC entity can make a mobility handover decision (such as changing at least one serving base station of the UE), and during the execution of the handover procedure, the RLC entity and the following sublayers
  • the context and data packets are all emptied. That is to say, after the UE accesses the new serving base station (target base station), the affected bearer data packet is at most the Packet Data Convergence Protocol (PDCP).
  • PDCP Packet Data Convergence Protocol
  • the AM RLC entity of the data bearer when configured as an Acknowledged Mode (AM), the AM RLC entity has an Automatic Repeat Request (ARQ) function, which can support error-free. Data transfer.
  • this error-free data transmission is the polling function of the active report status report (Status Report) of the data packet, the retransmission/re-segmentation function of the data packet, and the status of the receiving end of the data packet.
  • the report sending function is implemented.
  • the packet receiving end needs to detect the failure of receiving the data packet, which is related to the HARQ delay in the underlying MAC entity; on the other hand, the sending frequency of the status report needs to take into account the transmission delay and The balance between wireless efficiency, therefore, AM RLC also has a status prohibition function to avoid the status report is sent too frequently.
  • the RLC entity in the upper layer does not immediately respond to the retransmission-related response, but requires a certain waiting time, and correspondingly, the data packet accumulated in the retransmission buffer of the AM RLC entity during this period of time (RLC protocol) There will be more and more data units (Protocol Data Units, PDUs).
  • the serving base station node that bears a certain data bearer transmission of the user equipment (User Equipment, UE) performs the change
  • the data of the RLC entity and the following sublayers have not been submitted to the upper layer protocol entity regardless of the data transmitting end or the receiving end.
  • the package and related context will be emptied.
  • the source base station transmits to the target base station the conditions of the PDCP entity when the serving base station node changes/switches.
  • the data packet retransmission is implemented in the higher layer-PDCP sublayer of the wireless protocol stack, and the higher the level of the encapsulation processing protocol involved in the data packet, the relatively required processing. The longer the time.
  • the new carrier frequency band such as high-frequency millimeter wave millimeter wave, mmW
  • the codec and other processing schemes have a common purpose, that is, the order of the level to accelerate the underlying transmission rate. Therefore, when the above-mentioned underlying transmission link needs to be changed or the serving base station node needs to switch, and the like, the transmission throughput of the data packet is reduced or even greatly decreased in the process according to the existing processing mechanism. This has a very bad impact on the user experience.
  • the present application provides a data retransmission method and device, which can minimize the loss of the underlying data packet and implement fast retransmission of the data packet in the process of service link replacement, thereby effectively preventing the packet transmission throughput from decreasing.
  • the application provides a data retransmission method, including:
  • the upper layer protocol entity generates a status report according to the status of the buffer, and reports the status Sending to the peer protocol entity by using the second wireless carrier;
  • the upper layer protocol entity receives the data packet retransmitted by the peer protocol entity.
  • the upper layer protocol entity receives an indication that the first wireless carrier that is currently used to transmit the data packet is temporarily unavailable, and may include:
  • the second wireless carrier is the UE and the source serving node A wireless carrier used after stopping transmission of the first wireless carrier.
  • the indication is that the underlying protocol entity in the node sends out when detecting that the signal quality of the first wireless carrier drops to a preset threshold or is completely interrupted.
  • the upper layer protocol entity receives an indication, where the indication indicates that the UE accesses the target node, and may include:
  • the upper layer protocol entity receives the indication sent by the underlying protocol entity in the node, where the indication indicates that the UE accesses the target node; and the second wireless carrier is a wireless carrier used between the UE and the target node.
  • the data retransmission method may further include: before the receiving, by the upper layer protocol entity, the data retransmission method:
  • An upper layer protocol entity of the source serving node of the UE forwards the data packet in the buffer and its number information to an upper layer protocol entity located at the target node;
  • the upper layer protocol entity of the corresponding source serving node in the UE forwards the data packet in the buffer and its number information to an upper layer protocol entity of the corresponding target node in the UE.
  • the upper layer protocol entity may refer to an upper layer protocol entity corresponding to the source service node in the UE, or an upper layer protocol entity corresponding to the target node.
  • the upper layer protocol entity receives the indication, where the indication indicates the request for the status report
  • the method may include: the upper layer protocol entity receiving the indication on the second wireless carrier, where the indication is a polling request for the status report;
  • the second wireless carrier is a wireless carrier used by the UE and the source serving node after stopping transmission of the first wireless carrier, or a wireless carrier used between the UE and the target node.
  • the data retransmission method may further include: the upper layer protocol entity sorting and merging the data packets in the buffer with the received retransmission data packets.
  • the upper layer protocol entity may be a protocol entity above a medium access control layer (MAC) entity in a data packet receiving node on the wireless interface; the peer protocol entity may be a data packet sending node on the wireless interface a protocol entity in the same protocol stack level as the upper layer protocol entity; the underlying protocol entity being a physical layer (PHY) entity or the MAC entity.
  • MAC medium access control layer
  • PHY physical layer
  • the present application further provides a data retransmission method, including: receiving, by a peer protocol entity, a status report sent by an upper layer protocol entity by using a second wireless carrier, where the status report is received by the upper layer protocol entity according to the indication a state of the buffer, the indication indicating that the first wireless carrier currently used to transmit the data packet is temporarily unavailable, or indicating that the UE accesses the target node, or indicates a request for status reporting; the peer protocol entity is The upper layer protocol entity retransmits the data packet.
  • the data retransmission method may further include: receiving, by the peer protocol entity, a message sent by an underlying protocol entity in the node, where the peer protocol entity receives the status report sent by the upper layer protocol entity by using the second wireless carrier, The message indicates that the first wireless carrier currently used to transmit the data packet is temporarily unavailable, or the UE accesses the target node; the peer protocol entity sends a polling request to the upper layer protocol entity by using the second wireless carrier, requesting the request The upper layer protocol entity feedback status report; the second wireless carrier is a wireless carrier used by the UE and the source serving node after stopping transmission of the first wireless carrier, or a wireless carrier used between the UE and the target node .
  • the retransmission of the data packet by the peer protocol entity to the upper layer protocol entity may include: the peer protocol entity performing retransmission of the data packet on the second wireless carrier according to the information in the status report.
  • the data retransmission method may further include: detecting that a signal quality of the first wireless carrier is restored after a preset time period, and the first wireless carrier is superior to the first in a transmission rate or a resource load. After the retransmission of the data packet, the peer protocol entity forwards the data packet back to the underlying protocol entity corresponding to the first radio carrier for transmission.
  • the present application further provides a data retransmission apparatus, including: an indication module, a status reporting module, and a data packet receiving module; wherein the indication module is configured to receive an indication, wherein the indication indicates that the current is used for transmission The first wireless carrier of the data packet is temporarily unavailable, or indicates that the UE accesses the target node, or indicates a request for status reporting; the status reporting module is configured to be based on the buffer a status report is generated, and the status report is sent to the peer protocol entity by using the second wireless carrier; the data packet receiving module is configured to receive the data packet retransmitted by the peer protocol entity; wherein the data is heavy The transmitting device is deployed in an upper layer protocol entity.
  • the indication module may be configured to receive the indication sent by an underlying protocol entity in a node, where the indication indicates that a first wireless carrier currently used for transmitting a data packet is temporarily unavailable; the second wireless The carrier is a wireless carrier used by the UE and the source serving node after stopping transmission of the first wireless carrier.
  • the indication may be that the underlying protocol entity in the node sends out when detecting that the signal quality of the first wireless carrier drops to a preset threshold or is completely interrupted.
  • the indication module may be configured to receive the indication sent by an underlying protocol entity in a node, where the indication indicates that the UE accesses the target node; the second wireless carrier is the UE and the The wireless carrier used between the target nodes.
  • the status report module may be further configured to receive a data packet and a number information in a buffer forwarded by an upper layer protocol entity of the source serving node of the UE or an upper layer protocol entity of the corresponding source service node in the UE.
  • the upper layer protocol entity that is configured to be the data retransmission device may be an upper layer protocol entity corresponding to the source service node or an upper layer protocol entity corresponding to the target node.
  • the indication module may be configured to receive an indication on the second wireless carrier, where the indication is a polling request for a status report; the second wireless carrier is the UE and a source serving node a wireless carrier used after stopping transmission of the first wireless carrier, or a wireless carrier used between the UE and the target node.
  • the data packet receiving module may be further configured to sort and merge the data packets in the buffer with the received retransmission data packets.
  • the upper layer protocol entity deploying the data retransmission device may be a protocol entity above a MAC entity in a data packet receiving node on a radio interface; the peer protocol entity may send a data packet on a radio interface a protocol entity in the node that is the same as a protocol stack level of the upper layer protocol entity; the bottom layer protocol entity may be a PHY entity or the MAC entity.
  • the present application further provides a data retransmission apparatus, including: a receiving module and a retransmission module; wherein the receiving module is configured to receive a status report sent by an upper layer protocol entity by using a second wireless carrier, where the status The report is generated by the upper layer protocol entity according to the state of the buffer after receiving the indication, where the indication indicates that the first wireless carrier currently used for transmitting the data packet is temporarily unavailable, or indicates that the UE accesses the target node, or indicates the status The reported request; the retransmission module, configured to retransmit the data packet to the upper layer protocol entity; wherein the data retransmission device is deployed in a peer protocol entity of the upper layer protocol entity.
  • the receiving module may be configured to receive a message sent by an underlying protocol entity in a node where the peer protocol entity is located, where the message indicates that the first wireless carrier currently used for transmitting the data packet is temporarily unavailable.
  • the UE accesses the target node; the data retransmission device may further include: a sending module, configured to send a polling request to the upper layer protocol entity by using the second wireless carrier, requesting the upper layer protocol entity to feed back a status report
  • the second wireless carrier is a wireless carrier used by the UE and the source serving node after stopping transmission of the first wireless carrier, or a wireless carrier used between the UE and the target node.
  • the retransmission module may be configured to perform retransmission of the data packet on the second wireless carrier according to the information in the status report.
  • the retransmission module may be configured to detect that the signal quality of the first wireless carrier is restored after a preset time period, and the first wireless carrier is superior to the first in transmission rate or resource load. After the retransmission of the data packet, the data packet is transferred back to the underlying protocol entity corresponding to the first radio carrier for transmission.
  • the embodiment of the present application further provides a computer readable storage medium storing computer executable instructions, where the computer executable instructions are executed by a processor to implement the data retransmission method of the first aspect or the second aspect.
  • the embodiment of the present invention can immediately notify the upper layer protocol entity when detecting that the quality of a wireless carrier signal is degraded or completely interrupted, and the upper layer protocol entity generates a status report and sends the status report to the peer entity through another wireless carrier at the earliest transmission time; or The upper layer protocol entity requests the peer entity to feed back the status. Or, after the UE accesses the target SeNB, the status report is sent by the RLC entity of the corresponding source SeNB or the RLC entity of the corresponding target SeNB to the RLC entity in the target SeNB. In this way, the loss of the underlying data packet can be minimized and the data packet can be fastened during the service link replacement process.
  • FIG. 1a is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • FIG. 1b is a schematic structural diagram of still another communication system according to an embodiment of the present invention.
  • 2a is a schematic diagram of a user plane wireless protocol stack mode according to an embodiment of the present invention.
  • 2b is a schematic diagram of another user plane wireless protocol stack mode according to an embodiment of the present invention.
  • 2c is a schematic diagram of another user plane wireless protocol stack mode according to an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of a data retransmission method according to an embodiment of the present invention.
  • FIG. 4 is a schematic flowchart diagram of another data retransmission method according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart of a data retransmission method according to an exemplary embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a data retransmission method according to still another exemplary embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a data retransmission method according to still another exemplary embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a data retransmission apparatus according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of another data retransmission apparatus according to an embodiment of the present invention.
  • FIG. 1a and 1b are schematic diagrams showing the architecture of a communication system system according to an embodiment of the present invention.
  • SeNB-1 in the RAN can support carriers of different frequency points, SeNB-2 and SeNB-3 support different RATs, and the two nodes are connected by ideal backhaul; the SeNB and the service gateway in the CN (Serving Gateway) Whether the S1-U interface is established between S-GWs is optional, but an X2 interface is usually established between the SeNB and the MeNB.
  • a UE with multiple transceivers (multiple Rx/Tx) is in a dual connectivity (DC) or multiple connectivity (MC) state. In other words, the UE first accesses the MeNB, and between the UE and the MeNB.
  • the wireless interface can transmit at least control plane signaling (ie, establish a radio resource control connection (RRC Connection)), whether to establish a data plane bearer (DRB) of the user plane is optional; secondly, the UE is at least one SeNB Establishing a radio interface, the interface can transmit at least user plane data. For example, after accessing the SeNB-1, the UE-1 can obtain the data transmission service provided by the SeNB-1, where the SeNB-1 can decide to use Carrier-1. At least one of the carrier-2 and the carrier-2 communicate with each other, and after the UE-2 accesses the SeNB-2, the data transmission service provided by the SeNB-2 through the RAT-1 can be obtained.
  • RRC Connection radio resource control connection
  • DRB data plane bearer
  • a node capable of centrally managing the SeNB in the specific range may also be deployed, in the embodiment of the present invention.
  • This is called an SeNB Anchor.
  • the SeNB Anchor and its managed SeNB may be either an ideal backhaul or a non-ideal backhaul, such as an X2 interface.
  • the SeNB Anchor establishes an S1-U interface with the S-GW, and the SeNB-1 and SeNB-2 as the next-level nodes of the SeNB Anchor perform data transmission of the wired interface only through the X2 interface and the SeNB Anchor.
  • the DC state UE may access the SeNB-1 according to the indication of the MeNB, and obtain the data transmission service provided by the SeNB-1 for the UE through the RAT-1; and after the UE moves to the coverage of the SeNB-2, The data transmission service provided by the SeNB-2 through the RAT-2 can be obtained from the SeNB-1 to the SeNB-2 according to the indication of the control plane signaling.
  • the RAT-1/RAT-2 may be the same as or different from the RAT service provided by the MeNB for the UE.
  • the radio protocol stack is only located in the MeNB, that is, the E-UTRAN Radio Access Bearer (E-RAB) using only the MeNB resource may be referred to as a primary cell group.
  • the bearer Master Cell Group Bearer, MCG bearer
  • MCG bearer Master Cell Group Bearer
  • SeNB-1 SeNB-1 in FIG.
  • the SeNB-1 may determine the carrier- 1 or Carrier-2 schedules UE-1 to perform DRB-2 data transmission; corresponding to Carrier-1 and Carrier-2, PHY-1 and PHY-2 correspond to different HARQ entities in the MAC.
  • a bearer in which the radio protocol stack is located in the MeNB and the SeNB, that is, the MeNB and the SeNB resources are used together may be called a split bearer, such as DRB-3.
  • the DRB-3 uses the resources of the MeNB and the SeNB-2, and the MeNB acts as the anchor of the DRB-3 (the S1-U interface is established with the S-GW) to establish a complete radio protocol stack corresponding to the DRB, and the SeNB.
  • -2 establishes an RLC entity for DRB-3 and the following sublayers (ie, MAC and PHY), and the PDCP PDU is transmitted on the X2 interface between the MeNB and the SeNB-2.
  • the UE In the wireless protocol stack mode shown in FIG. 2c, the UE currently accesses the MeNB and the SeNB-1, and the SeNB Anchor serves as an anchor point of the SeNB side user plane, a PDCP entity configured with the DRB, and the SeNB-1 serves as the serving base station of the UE.
  • the RLC entity configured with the DRB and the following sublayers, the PDCP PDU is transmitted on the X2 interface between the SeNB Anchor and the SeNB-1.
  • the type of the small station node, the number of carriers that can be supported, the number and number of RATs that can be supported, whether a wired interface is established with the core network, and the interface between the small station node and the small station node and the macro base station are established.
  • the embodiments of the present invention are applicable under the schematic frameworks corresponding to Figs. 1a, 1b, 2a, 2b, and 2c.
  • the RLC entity of the transmitting node of the user plane radio bearer data packet is referred to as RLC-1
  • RLC-2 the RLC entity of the receiving node
  • the downlink node is a node in the access network, such as an SeNB
  • the sending node is a UE
  • the receiving node is a UE
  • the receiving node is a node in the access network, such as a SeNB.
  • an embodiment of the present invention provides a data retransmission method, where the method includes:
  • Step 301 The upper layer protocol entity receives an indication that the first wireless carrier currently used to transmit the data packet is temporarily unavailable, or indicates that the user equipment (UE) accesses the target node, or indicates a request for status reporting.
  • UE user equipment
  • Step 302 The upper layer protocol entity generates a status report according to the state of the buffer, and sends the status report to the peer protocol entity by using the second wireless carrier.
  • Step 303 The upper layer protocol entity receives a data packet that is retransmitted by the peer protocol entity.
  • the upper layer protocol entity receives an indication that the first wireless carrier that is currently used to transmit the data packet is temporarily unavailable, and may include: the upper layer protocol entity receiving the indication sent by the underlying protocol entity in the node where the upper layer protocol entity is located.
  • the indication indicates that the first wireless carrier currently used for transmitting the data packet is temporarily unavailable; the second wireless carrier is a wireless carrier used by the UE and the source serving node after stopping transmission of the first wireless carrier.
  • the indication may be issued when the underlying protocol entity in the node detects that the signal quality of the first wireless carrier drops to a preset threshold or is completely interrupted.
  • the upper layer protocol entity receives an indication, where the indication indicates that the UE accesses the target node, and the method includes: the upper layer protocol entity receiving the indication sent by the underlying protocol entity in the node, where the indication indicates that the UE accesses the target a node; the second wireless carrier is a wireless carrier used between the UE and the target node.
  • the data retransmission method may further include: the upper layer protocol entity of the source serving node of the UE forwards the data packet in the buffer and the number information thereof to the location where the upper layer protocol entity receives the indication An upper layer protocol entity of the target node; the upper layer protocol entity of the corresponding source service node in the UE forwards the data packet in the buffer and its number information to an upper layer protocol entity of the corresponding target node in the UE.
  • the upper layer protocol entity may be an upper layer protocol entity corresponding to the source service node in the UE, or an upper layer protocol entity corresponding to the target node.
  • the upper layer protocol entity receives the indication, where the indication indicates the request for the status report
  • the method may include: the upper layer protocol entity receiving the indication on the second wireless carrier, where the indication is a polling request for the status report;
  • the second wireless carrier is at the stop of the UE and the source serving node A wireless carrier used after transmission of the first wireless carrier, or a wireless carrier used between the UE and the target node.
  • the data retransmission method may further include: the upper layer protocol entity sorting and merging the data packets in the buffer with the received retransmission data packets.
  • the upper layer protocol entity may be a protocol entity above the MAC entity in the data packet receiving node on the wireless interface; the peer protocol entity may be a data packet sending node in the wireless interface and the upper layer
  • the protocol entity of the protocol entity is the same protocol entity; the underlying protocol entity may be a physical layer (PHY) entity or the MAC entity.
  • the embodiment of the present invention further provides a data retransmission method, including:
  • Step 310 The peer protocol entity receives a status report sent by the upper layer protocol entity by using the second wireless carrier, where the status report is generated by the upper layer protocol entity according to the state of the buffer after receiving the indication, where the indication indicates that the data is currently used for transmitting.
  • the first wireless carrier of the packet is temporarily unavailable, or indicates that the UE accesses the target node, or indicates a request for status reporting;
  • Step 311 The peer protocol entity retransmits the data packet to the upper layer protocol entity.
  • the data retransmission method may further include: receiving, by the peer protocol entity, a message sent by an underlying protocol entity in the node, where the peer protocol entity receives the status report sent by the upper layer protocol entity by using the second wireless carrier, The message indicates that the first wireless carrier currently used to transmit the data packet is temporarily unavailable, or the UE accesses the target node; the peer protocol entity sends a polling request to the upper layer protocol entity by using the second wireless carrier, requesting the request The upper layer protocol entity feedback status report; the second wireless carrier is a wireless carrier used by the UE and the source serving node after stopping transmission of the first wireless carrier, or a wireless carrier used between the UE and the target node .
  • the retransmission of the data packet by the peer protocol entity to the upper layer protocol entity may include: the peer protocol entity performing retransmission of the data packet on the second wireless carrier according to the information in the status report.
  • the signal quality of the first wireless carrier is recovered after a preset time period, and the first wireless carrier is superior to the second wireless carrier in a transmission rate or a resource load, and the data packet is completed.
  • the peer protocol entity may further forward the data packet to the first radio bearer.
  • the underlying protocol entity corresponding to the wave is transmitted.
  • the serving base station such as SeNB-1) accessed by the UE has two or more radio carriers (such as Carrier-1 and Carrier-2, where Carrier-1/2 can be the same or different RAT), UE
  • the data packet of a certain data bearer is transmitted through Carrier-1 and SeNB-1; or the SeNB-1 accessed by the UE has one radio carrier Carrier-1, and the SeNB-1 passes the ideal backhaul with another base station node (SeNB-2).
  • Carrier-2) is connected, wherein Carrier-1 and Carrier-2 have different frequency points and RATs may be the same or different
  • SeNB-2 has the configuration of the RLC entity corresponding to the UE and the data bearer and the following sublayers. /Context.
  • the RLC PDU carried by the data can be retransmitted by Carrier-2 as necessary.
  • the MAC entity when the underlying protocol entity (the PHY and the MAC entity, or at least the data transmission part in the existing MAC entity, such as the HARQ entity) detects Carrier-1
  • the signal quality drops to a certain threshold (eg, a preset threshold) or even when it is completely interrupted (such as an obstruction in the transmission path of mmW)
  • the MAC entity immediately indicates the detection result to an upper layer protocol entity (such as RLC-2).
  • the upper layer protocol entity After receiving the indication of the detection result, the upper layer protocol entity checks the status of the data packet buffer to generate a status report, and sends it to the opposite entity through the carrier-2 at the earliest transmission timing (the protocol entity of the data packet sending node, such as RLC-1).
  • the peer entity performs corresponding packet retransmission on Carrier-2 according to the information indicated in the Status Report.
  • the upper layer protocol entity (such as RLC) -1)
  • the opposite entity such as RLC-2 or UE
  • the peer is requested to feed back a status report, wherein polling is sent through Carrier-2.
  • the peer entity generates a status report immediately after receiving the polling request and sends it through Carrier-2.
  • the MAC entity of Carrier-1 may be submitted to an upper layer protocol entity (such as RLC-1) to indicate an indication that Carrier-1 can be used, or a transmission opportunity to deliver a schedulable RLC packet to RLC-1.
  • an upper layer protocol entity such as RLC-1
  • the transmitting node knows the information that Carrier-1 can use.
  • the receiving node's protocol entity such as RLC-2 or UE
  • Scenario 2 The UE transmits a data packet of a bearer through Carrier-1 and SeNB-1, and the mobility decision determines that the bearer needs to be changed to SeNB-2 (Carrier-2) to continue transmission; wherein the bearer is connected.
  • the PDCP entity on the ingress side is located at the MeNB or the SeNB Anchor, that is, the node is not changed as the SeNB changes.
  • the protocol entity (such as the RLC entity) located above the MAC entity of the source SeNB will use the data packet in the buffer and the corresponding sequence number (Sequence Number, SN). Forwarding to the protocol entity located in the target SeNB; the RLC entity corresponding to the source SeNB in the UE forwards the data packet in the buffer to the RLC entity corresponding to the target SeNB.
  • the RLC entity of the target SeNB in the UE After the UE accesses the target SeNB, the RLC entity of the target SeNB in the UE sends a status report (Status Report) to the peer entity (ie, the RLC entity) located in the target SeNB, and the RLC entity in the target SeNB reports according to the status (Status) The information indicated in Report) performs the necessary RLC packet retransmission. If the RLC entity of the corresponding source SeNB has not cleared the data packet and the context after the UE is accessing the target SeNB, the status report may also be sent by the RLC entity of the corresponding source SeNB in the UE to the peer entity located in the target SeNB. The RLC entity corresponding to the target SeNB in the UE combines the data packet from the RLC entity of the corresponding source SeNB and the data packet from the RLC entity in the target SeNB for sorting and the like.
  • the RLC entity and the data packet are the names of the wireless protocol entity and the data packet in the E-UTRAN system in the embodiment of the present invention, and may actually refer to the protocol entity and the data packet above the MAC entity in the user plane ( It may even be a packet above the HARQ entity in the MAC entity, ie other references do not affect the essence of the solution described in the embodiments of the present invention.
  • FIG. 1a the system architecture is illustrated in FIG. 2a and the user plane radio protocol stack mode in FIG. 2a.
  • This embodiment mainly uses UE-1 as an example to illustrate the implementation process of the data retransmission of the present invention.
  • the serving base station currently accessed by the UE-1 in the DC state is the MeNB and the SeNB-1, wherein the control plane RRC connection is established between the MeNB and the UE-1, and the DRB-1 (MCG) is transmitted on the user plane with the UE-1.
  • Bearer data packet
  • SeNB-1 has an S1-U interface with the S-GW in the core network, and the node itself is configured with carrier-1 and carrier-2 carriers (which may be different frequency carriers of the same RAT, or two) The RAT of the carrier is different)
  • SeNB-1 currently uses Carrier-1 and the UE to transmit the data packet of the DRB-2 (SCG bearer).
  • Carrier-1 is mainly reflected in different PHY layers (PHY-1 and PHY-2, different parameter configurations), and SeNB-1 is Carrier-1.
  • Carrier-2 can be configured with a unified MAC entity (the HARQ-1 and HARQ-2 entities corresponding to PHY-1 and PHY-2 in the MAC entity), or two MAC entities respectively configured; and the upper layer protocol entity Speaking (such as RLC and PDCP entities), there is only one corresponding to DRB-2.
  • FIG. 5 is a schematic diagram of a status report sending process of the SCG bearer data packet receiving node (UE-1), which mainly includes the following steps:
  • Step 401 The PHY/MAC entity starts to receive SCG bearer data on the first radio link bearer (Carrier-1), the PHY performs signal measurement of the radio interface, and the PHY/MAC determines whether an obstruction occurs (blockage) if If yes, the MAC entity of the UE-1 indicates to the upper layer protocol entity (such as the RLC entity) that the carrier-1 is temporarily unavailable, and proceeds to step 402; otherwise, the signal measurement of the wireless interface is continued;
  • Carrier-1 the first radio link bearer
  • the PHY performs signal measurement of the radio interface
  • the PHY/MAC determines whether an obstruction occurs (blockage) if If yes, the MAC entity of the UE-1 indicates to the upper layer protocol entity (such as the RLC entity) that the carrier-1 is temporarily unavailable, and proceeds to step 402; otherwise, the signal measurement of the wireless interface is continued;
  • the PHY of the UE-1 measures the signal quality of the first radio link bearer (Carrier-1) chain in real time according to the configuration of the SeNB-1, and the PHY layer and At least one of the MAC sublayers determines the signal status of the radio link according to the measurement result and performs corresponding packet scheduling.
  • Carrier-1 as the HF carrier and the blockage in the transmission path as an example
  • the underlying protocol entity of UE-1 learns that Carrier-1 is temporarily unable to transmit the data packet (or The HARQ-1 entity has a higher transmission failure rate. Therefore, the MAC entity of the UE-1 indicates to the carrier layer that the carrier-1 is temporarily unavailable, and changes the underlying transmission link to Carrier-2. (PHY-2 and HARQ-2).
  • Step 402 As a receiving node of the data packet, the RLC entity corresponding to the DRB-2 in the UE-1 is connected. After receiving the indication submitted by the underlying entity (such as the MAC entity), it is known that the carrier-1 underlying transmission link has been interrupted (that is, the HARQ-1 entity cannot successfully complete the reception of the data packet), so the RLC entity (specifically The receiving side in the AM RLC entity checks the status in the current buffer and generates a status report, and transmits the said to the opposite entity (the RLC entity in SeNB-1) via the second radio link bearer (Carrier-2) as early as possible. status report.
  • the underlying entity such as the MAC entity
  • Step 403 After receiving the status report, the RLC entity corresponding to the DRB-2 in the SeNB-1 performs corresponding data packet retransmission and necessary re-segmentation according to the information indicated therein, and retransmits the data packet and the subsequent first transmission.
  • the data packet is sent to UE-1 through Carrier-2.
  • the RLC entity in UE-1 also processes the data packets in the buffer in association with the data packets received on Carrier-2, such as sorting and merging.
  • Carrier-1's signal quality is recovered after a short period of time (ie, other effects such as the mobility decision of the RRC entity have not been triggered), then if Carrier-1 is at transmission speed or resource load, etc.
  • the data packet can be changed back to the MAC/PHY entity corresponding to Carrier-1 for transmission.
  • the transmission condition of Carrier-2 may still be good (that is, the operation of the change back is not due to the occurrence of an occlusion in the transmission path of Carrier-2, etc.), is it necessary to perform the scheme described in this embodiment? It can be determined by the RLC entity of UE-1.
  • this embodiment mainly uses UE-2 as an example to illustrate the implementation process of the data retransmission of the present invention.
  • the serving base station currently accessed by the UE-2 in the DC state is the MeNB and the SeNB-2, wherein the MeNB and the UE-2 have a control plane RRC connection, and a complete protocol stack of the DRB-3 is built on the user plane, and Transmitting the data packet of the DRB-3 to the UE-2 through the radio interface; the SeNB-2 transmits the data packet of the DRB-3 in the same manner as the UE-2 through the RAT-1 carrier supported by itself, wherein the DRB-3 is an existing DC
  • the form of a split bearer in the user plane architecture is the MeNB and the SeNB-2, wherein the MeNB and the UE-2 have a control plane RRC connection, and a complete protocol stack of the DRB-3 is built on the user plane, and Transmitting the data packet of the DRB-3 to the UE-2 through the radio interface; the SeNB-2 transmits the data packet of the DRB-3 in the same manner as the UE-2 through the RAT-1 carrier supported by itself, wherein the DRB-3 is an existing
  • the SeNB-2 is connected to the neighboring node SeNB-3 (the RAT-2 carrier supported on the radio interface) through an ideal backhaul, and the SeNB-2/3 has an X2 interface with the MeNB; wherein, the SeNB-3 and the UE The wireless protocol stack corresponding to the SeNB part of DRB-3 has been established in -2.
  • FIG. 6 is a transmission between the SeNB node and the UE in the access network.
  • the process flow diagram of the status report is as follows:
  • Step 501 In the process of transmitting data to the UE-2, the underlying protocol entity (such as the PHY layer and the MAC entity) of the SeNB-2 detects the signal status of the wireless interface in real time through the "RLC PDU for Split bearer". Taking RAT-1 as the high-frequency carrier and the blockage appearing in the transmission path (that is, the PHY/MAC determines the blockage) as an example, SeNB-2 judges that RAT-1 cannot temporarily transmit the data packet, then the RLC in SeNB-2 The entity immediately forwards the data packet in the buffer to the SeNB-3 through an ideal interface (ideal backhaul). For example, the RLC entity in the SeNB-2 forwards the RLC PDU (Forwarding the RLC PDU in buffer) to the SeNB. 3.
  • the underlying protocol entity such as the PHY layer and the MAC entity
  • Step 502 After receiving the data packet forwarded by the SeNB-2, the SeNB-3 initiates polling to the UE-2 through the RAT-2 carrier, that is, actively requests the status report to the receiving node of the data packet; at this time, the SeNB The state-related timer of the RLC entity in -3 is in the off state.
  • Step 503 After receiving the polling, the UE-2 checks the status in the current buffer, generates a status report, and sends the status report as soon as the next transmission opportunity arrives, and queues the data packet waiting for transmission.
  • the status report is sent to the correspondent entity (the RLC entity in SeNB-3) via RAT-2.
  • the RLC entity in the SeNB-3 After receiving the status report (Status Report), the RLC entity in the SeNB-3 performs corresponding data packet retransmission and necessary re-segmentation according to the information indicated therein, and retransmits the data packet with the subsequent first-time data packet.
  • Sent to the UE-2 (RLC PDU for Split Bearer (Retransmission and Transmission)) by the RAT-2.
  • the RLC entity in the UE-2 receives the data packet in the buffer and the RAT-2. The data packets are combined for sorting and merging.
  • the data packet can be transferred back to SeNB-2 for continued transmission.
  • the scheme of turning back may refer to the related operation when the RAT-1 is changed to the RAT-2. If the RAT-1 carrier quality of the SeNB-2 is still not recovered after a certain time, the SeNB-2 or the SeNB-3 may pass the converted information to the MeNB, and the MeNB will generate the DRB after receiving the information. The partial RLC PDU of -3 is offloaded to SeNB-2 to continue the transmission.
  • this embodiment mainly uses the SeNB node handover procedure as an example to illustrate the implementation process of the data retransmission of the present invention.
  • the serving base station currently accessed by the UE in the DC state is the MeNB and the SeNB-1, wherein the control plane RRC connection is established between the MeNB and the UE, and the SeNB-1 transmits the data of a certain DRB through the RAT-1 carrier supported by the SeNB-1. package.
  • a SeNB Anchor node is built in the coverage of the MeNB, and the SeNB Anchor can have an S1-U interface with the S-GW in the core network.
  • the SeNB nodes in a certain range and the SeNB Anchor have X2. The interface and the data of the user plane.
  • Each of the data-bearing PDCP entities is built on the SeNB Anchor node, and the RLC entities of the data bearers and the following sub-layers are established on the SeNB nodes in the range.
  • the performance of the interface between the SeNB nodes in the SeNB Anchor range is good.
  • the SeNB-1 and the neighboring node SeNB-2 are connected by the ideal backhaul.
  • FIG. 7 is a schematic flowchart of data retransmission in the embodiment:
  • Step 601 The MeNB sends the measurement configuration to the UE and receives the measurement report of the UE. According to the measurement report and other radio resource management information, the MeNB decides to switch the UE from the currently accessed SeNB-1 to the SeNB-2. Therefore, the MeNB requests the SeNB-2 to the radio resource related to the UE (the request message carries the SeNB-1 to the RLC entity configuration parameter of the DRB) and obtains an acknowledgment reply message of the SeNB-2, where the message carries the SeNB-2 The radio resource configuration of the UE and the tunnel address at which the SeNB-1 forwards the data packet. The message exchanged between the MeNB and the SeNB-2 can be transmitted by the SeNB Anchor.
  • Step 602 After receiving the acknowledgment reply message of the SeNB-2, the MeNB sends RRC signaling to the UE through the radio interface to indicate that the UE leaves the SeNB-1 cell, accesses the SeNB-2 cell, and reconstructs the MAC according to the configuration information. Entity and physical layer, however, the buffer and context in the RLC entity are not cleared; on the other hand, the MeNB sends a message indicating the node handover to the SeNB-1 through the X2 interface, and the message carries the tunnel in which the SeNB-2 receives the forwarded data packet. address.
  • the UE After receiving the RRC signaling of the MeNB, the UE leaves the SeNB-1 cell and initiates random access to the SeNB-2 cell, and newly creates a MAC entity and a PHY inside the node. If the RLC entity corresponding to the SeNB-2 of the DRB is newly created, the RLC entity corresponding to the SeNB-1 forwards the data packet and the SN state in the buffer to the RLC entity corresponding to the SeNB-2, and the original RLC entity may be after the forwarding is completed. Delete; otherwise, the buffer in the original RLC entity can be kept unchanged. After the protocol entity reconfiguration is completed, the UE replies to the MeNB with the RRC signaling indicating completion.
  • the SeNB-1 After receiving the X2 message of the MeNB, the SeNB-1 forwards the data packet and the SN state in the RLC entity to the SeNB-2.
  • Step 603 After accessing the SeNB-2 cell, the UE checks the buffer status in its own RLC entity and sends a status report to the SeNB-2 as soon as possible. After receiving the Status Report, the RLC entity in the SeNB-2 receives the Status Report. Corresponding data packet retransmission and necessary re-segmentation are performed according to the information indicated therein, and the retransmitted data packet and the subsequent first-transferred data packet are sent to the UE through the RAT-2. The RLC entity in the UE performs processing such as sorting and merging the data packets in the buffer in association with the data packets received on the RAT-2.
  • the SeNB-2 sends an indication message to the SeNB Anchor to notify the SeNB of the Anchor Path Switch, so that the SeNB Anchor sends the subsequent PDCP PDU to the SeNB-2 to continue the transmission after receiving the indication message.
  • the embodiment of the present invention provides a data retransmission apparatus deployed in an upper layer protocol entity, including: an indication module 701, a status report module 702, and a data packet receiving module 703.
  • the indication module 701 is configured to Receiving an indication, wherein the indication indicates that a first wireless carrier currently used to transmit a data packet is temporarily unavailable, or indicates that the UE accesses the target node, or indicates a request for a status report;
  • the status report module 702 is configured to generate a status report according to the status of the buffer, and send the status report to the peer protocol entity by using the second wireless carrier;
  • the data packet receiving module 703 is configured to receive a data packet that is retransmitted by the peer protocol entity.
  • the indication module 701 may be configured to receive the indication sent by an underlying protocol entity in a node, where the indication indicates that a first wireless carrier currently used for transmitting a data packet is temporarily unavailable;
  • the wireless carrier is a wireless carrier used by the UE and the source serving node after stopping transmission of the first wireless carrier.
  • the indication may be issued when the underlying protocol entity in the node detects that the signal quality of the first wireless carrier drops to a preset threshold or is completely interrupted.
  • the indication module 701 may be configured to receive the indication sent by an underlying protocol entity in a node, where the indication indicates that the UE accesses the target node; the second wireless carrier is the UE and the The wireless carrier used between the target nodes.
  • the status report module 702 may be further configured to receive a data packet and its number information in a buffer forwarded by an upper layer protocol entity of the source serving node of the UE or an upper layer protocol entity of the corresponding source service node in the UE.
  • the upper layer protocol entity that is configured to be the data retransmission device may be an upper layer protocol entity corresponding to the source service node in the UE or an upper layer protocol entity corresponding to the target node.
  • the indication module 701 may be configured to receive an indication on the second wireless carrier, where the indication is a polling request for a status report, and the second wireless carrier is the UE and a source service. a wireless carrier used by the node after stopping transmission of the first wireless carrier, or a wireless carrier used between the UE and the target node.
  • the data packet receiving module 703 may be further configured to sort and merge the data packets in the buffer with the received retransmission data packets.
  • the upper layer protocol entity deploying the data retransmission device may be a protocol entity above a MAC entity in a data packet receiving node on a radio interface; the peer protocol entity may send a data packet on a radio interface a protocol entity in the node that is the same as a protocol stack level of the upper layer protocol entity; the bottom layer protocol entity may be a PHY entity or the MAC entity.
  • an embodiment of the present invention provides a data retransmission apparatus deployed in a peer protocol entity of the upper layer protocol entity, including: a receiving module 801 and a retransmission module 802; wherein, the receiving module 801 is configured.
  • the wireless carrier is temporarily unavailable, or indicates that the UE accesses the target node, or indicates a request for status reporting; and the retransmission module 802 is configured to retransmit the data packet to the upper layer protocol entity.
  • the receiving module 801 may be further configured to receive a message sent by an underlying protocol entity in a node where the peer protocol entity is located, where the message indicates that the first wireless carrier currently used for transmitting the data packet is temporarily unavailable.
  • the UE accesses the target node; the data retransmission device may further include: a sending module 803, configured to send a polling request to the upper layer protocol entity by using the second wireless carrier, requesting feedback of the upper layer protocol entity a status report; the second wireless carrier is a wireless carrier used by the UE and the source serving node after stopping transmission of the first wireless carrier, or a wireless carrier used between the UE and the target node.
  • the retransmission module 802 can be configured to perform retransmission of the data packet on the second wireless carrier according to the information in the status report.
  • the retransmission module 802 may be further configured to detect that the signal quality of the first wireless carrier is restored after a preset time period, and the A wireless carrier is superior to the second wireless carrier in transmission rate or resource load, and after completing the retransmission of the data packet, the data packet is transferred back to the underlying protocol entity corresponding to the first wireless carrier for transmission.
  • the data retransmission device provided by the embodiment of the present invention may be used to implement the technical solution of the foregoing method embodiment, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the embodiment of the present invention further provides a computer readable storage medium, where computer executable instructions are executed, and when the computer executable instructions are executed by the processor, data retransmission of the upper layer protocol entity side or the peer protocol entity side is implemented. method.
  • computer storage medium includes volatile and nonvolatile, implemented in any method or technology for storing information, such as computer readable instructions, data structures, program modules or other data. Sex, removable and non-removable media.
  • Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridge, magnetic tape, magnetic disk storage or other magnetic storage device, or may Any other medium used to store the desired information and that can be accessed by the computer.
  • communication media typically includes computer readable instructions, data structures, program modules, or other data in a modulated data signal, such as a carrier wave or other transport mechanism, and can include any information delivery media. .
  • the embodiment of the present application provides a data retransmission method and device, which can reduce the loss of the underlying data packet and implement fast retransmission of the data packet in the process of replacing the service link, thereby avoiding the decrease of the data packet transmission throughput and improving the throughput.
  • the rate of packet transmission and enables the transceiver nodes of the data transmission to effectively manage the protocol entity buffer, thereby providing the user with a communication experience that fully satisfies the requirements.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de retransmission de données. Le procédé comprend les étapes suivantes : une entité de protocole de couche supérieure reçoit une indication, l'indication indiquant qu'une première porteuse radio utilisée actuellement pour transmettre un paquet de données est temporairement indisponible ou l'indication indiquant qu'un équipement utilisateur (UE) accède à un nœud cible ou l'indication indiquant une demande de rapport d'état ; l'entité de protocole de couche supérieure produit un rapport d'état selon un état d'un tampon, et envoie le rapport d'état à une entité de protocole d'extrémité d'homologue grâce à une deuxième porteuse radio ; et l'entité de protocole de couche supérieure reçoit un paquet de données retransmis par l'entité de protocole d'extrémité d'homologue. L'invention concerne également un appareil de retransmission de données correspondant. Grâce au procédé et à l'appareil de retransmission de données de l'invention, la perte de paquets de données de couche inférieure dans un remplacement de liaison de service peut être réduite autant que possible et une retransmission rapide de paquets de données peut être mise en œuvre, ce qui permet d'éviter efficacement la réduction du débit de transmission de paquets de données.
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