WO2020191784A1 - 一种重传信息的传输方法及装置 - Google Patents

一种重传信息的传输方法及装置 Download PDF

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Publication number
WO2020191784A1
WO2020191784A1 PCT/CN2019/080271 CN2019080271W WO2020191784A1 WO 2020191784 A1 WO2020191784 A1 WO 2020191784A1 CN 2019080271 W CN2019080271 W CN 2019080271W WO 2020191784 A1 WO2020191784 A1 WO 2020191784A1
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WO
WIPO (PCT)
Prior art keywords
network device
information
terminal
downlink data
downlink
Prior art date
Application number
PCT/CN2019/080271
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English (en)
French (fr)
Inventor
唐珣
陈君
张戬
Original Assignee
华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2019/080271 priority Critical patent/WO2020191784A1/zh
Publication of WO2020191784A1 publication Critical patent/WO2020191784A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink

Definitions

  • This application relates to the field of communication technology, and in particular to a method and device for transmitting retransmission information.
  • a switching of the serving cell may occur, switching from a source cell to a target cell.
  • MBB connection maintenance
  • an enhanced make before break (eMBB) solution is proposed, or called a simultaneous connection switching solution.
  • eMBB enhanced make before break
  • the eMBB solution requires the terminal to have the ability to perform uplink and downlink transmissions with two cells at the same time, but in some scenarios, the terminal does not have such ability.
  • the terminal only has the dual-receiving capability but not the dual-transmit capability, that is, the terminal only has the capability to receive downlink data from two cells at the same time, but does not have the capability to send uplink data to the two cells at the same time.
  • the eMBB solution is not perfect. For example, in the design of hybrid automatic retransmission request (HARQ), if the terminal can receive the downlink data of the source cell, but cannot send feedback information (such as HARQ information) to the source cell ), it will affect data retransmission.
  • HARQ hybrid automatic retransmission request
  • the present application provides a method for transmitting retransmission information to solve the transmission problem of downlink data feedback information of a terminal with dual-receiving and single-sending capabilities.
  • a method for transmitting retransmission information is provided.
  • the subject of the method is a terminal.
  • the method includes: receiving downlink data from a first network device; sending retransmission information for the downlink data to a second network device,
  • the retransmission information may also be referred to as feedback information.
  • the retransmission information is used to indicate whether the downlink data is successfully received, or whether part or all of the downlink data needs to be retransmitted.
  • the first network device and the second network device serve for a terminal in common, and the terminal has dual reception from the first network device and the second network device and single transmission to the second network device Ability.
  • the second network device will forward the retransmission information to the first network device through the X2 interface, and the first network device will perform a new transmission or retransmission based on the retransmission information or feedback information, This will help improve the HARQ mechanism, improve the reliability of data transmission, and help improve the eMBB solution when applied in cell handover scenarios.
  • the retransmission information is hybrid automatic repeat request HARQ feedback information.
  • the HARQ feedback information includes a time domain resource index and first indication information, the time domain resource index is used to indicate a time domain resource for transmitting the downlink data, and the first indication information is used to indicate whether the downlink data is received success. Since the inter-station transmission between the first network device and the second network device may have a large delay, the second network device forwards the retransmission information to the first network device with a large delay, and time domain resources are used.
  • the index can clearly indicate which downlink data is successfully received and which downlink data is not successfully received, and it is better to schedule new transmission or retransmission of downlink data that fails to be received.
  • the time domain resource index includes one or more of the following: frame number, subframe number, and short transmission time interval sTTI index number.
  • the first indication information includes correct ACK information or incorrect NACK information.
  • the downlink data includes one or more transport blocks TB, or the downlink data includes one or more data packets, and the first indication information is used to indicate the data in the one or more TBs. Whether each TB is successfully received. That is, each TB uses an ACK/NACK message to indicate whether the TB is successfully received.
  • downlink scheduling assistance information is sent to the second network device, where the downlink scheduling assistance information is used to assist the first network device in performing downlink scheduling on the terminal.
  • the first network device determines the downlink data that the terminal fails to receive according to the HARQ feedback information received from the second network device, and sends the downlink data that has failed to be received by the terminal according to the downlink scheduling auxiliary information to the terminal in a new transmission manner.
  • the downlink scheduling assistance information includes one or more of the following information: channel state information, measurement report, reference signal received power, reference signal received quality, signal to interference and noise ratio, downlink transmission repetition times, Redundancy version RV or modulation and coding method for downlink transmission.
  • the downlink scheduling auxiliary information can help the first network device to send downlink data that the terminal fails to receive in a new transmission manner to the terminal.
  • the retransmission information is hybrid automatic repeat request HARQ feedback information.
  • the HARQ feedback information includes an HARQ process identifier and second indication information.
  • the HARQ process identifier is used to indicate the HARQ process for transmitting the downlink data
  • the second indication information is used to indicate whether the downlink data is successfully received. This method is compatible with the existing HARQ retransmission mechanism.
  • the second indication information includes correct ACK information or incorrect NACK information.
  • part of the bits in the HARQ process identifier is the RV field in the downlink control information DCI; and/or, part of the bits in the HARQ process identifier is the NDI field in the downlink control information DCI.
  • the downlink data includes one or more transport blocks TB, and the second indication information is used to indicate whether each TB of the one or more TBs is successfully received, and one of the TBs occupies One HARQ process; receiving downlink data from the first network device includes: receiving multiple times for each of the one or more TBs.
  • Using each TB to repeatedly transmit X times is equivalent to expanding the number of original HARQ processes by X times to achieve the purpose of expanding the number of processes. It can alleviate the impact of the large transmission delay between the first network device and the second network device station.
  • a conversion message is received from the first network device or the second network device, and the conversion message is used to instruct the terminal to send the HARQ to the second network device when a condition is met. Feedback. Instruct the terminal to switch the HARQ mode through the switch message.
  • a timer in response to receiving the conversion message, a timer is started; after the timer expires, the HARQ feedback information for the downlink data is sent to the second network device.
  • the first timer can be used to periodically report HARQ feedback information for downlink data.
  • the HARQ feedback information for the downlink data is sent to the second network device; or, it is determined to receive the first network device.
  • the HARQ feedback information for the downlink data is sent to the second network device.
  • the start time of the counting can be specified by the protocol or based on the displayed message indication, for example, the counting starts from the moment the switch message is received.
  • the method of receiving the number of downlink scheduling of the first network device reaches the first threshold, and the method of receiving when the number of TBs sent by the first network device reaches the second threshold can be compared with the first timing
  • the combination of timer timing methods, through the combination of two trigger mechanisms, can improve reporting efficiency and avoid reporting delays.
  • a method for transmitting retransmission information is provided.
  • the execution subject of the method may be a terminal.
  • the method includes: receiving downlink data from a first network device; The high-level status report of the device; wherein, the first network device and the second network device serve the terminal together, and the terminal has dual reception from the first network device and the second network device and sends it to the The ability of the second network device to send single.
  • the timer can be used to periodically report high-level status reports.
  • the triggering method of the number of lost packets reaching the threshold it can feed back the high-level status report in time in combination with the lost packets, and receive the high-level retransmission data in time.
  • the combination of the two methods can improve reporting efficiency and avoid reporting delays.
  • a conversion message is received from the first network device or the second network device, and the conversion message is used to instruct the terminal to send a message specific to the first network device to the second network device when a condition is met. High-level status report of the device.
  • a timer in response to receiving the conversion message, a timer is started.
  • the high-level status report includes a radio link control RLC status report and/or a packet data aggregation protocol PDCP status report.
  • RLC radio link control
  • PDCP status report a packet data aggregation protocol
  • the RLC can feed back the RLC status report and retransmit through the RLC layer, and it can also be combined with the PDCP layer for retransmission; if the RLC works in unacknowledged mode (UM) , Only the PDCP status report can be sent, and retransmission is performed through the PDCP layer.
  • AM acknowledged mode
  • UM unacknowledged mode
  • a device for transmitting retransmission information has the function of realizing any possible design of the first aspect, the second aspect, and the first aspect and any possible design of the second aspect.
  • the function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the device can be a chip or an integrated circuit.
  • the device includes a transceiver and a processor, the transceiver is used to communicate with other communication devices, and the processor is used to couple with the memory to execute the program stored in the memory.
  • the device can The method described in any possible design of the foregoing aspect, second aspect, and first aspect and any possible design of the second aspect is performed.
  • the device also includes a memory for storing programs executed by the processor.
  • the device is a terminal.
  • a chip is provided, the chip is connected to a memory or the chip includes a memory, and is used to read and execute a software program stored in the memory, so as to implement the above-mentioned first, second, and first aspects.
  • a method for transmitting retransmission information is provided.
  • the execution subject of the method is a network device, which can be recorded as a second network device.
  • the method includes: receiving retransmission information for downlink data from a terminal, and sending the retransmission information to the first network device.
  • the retransmission information may also be referred to as feedback information.
  • the retransmission information is used to indicate whether the downlink data is successfully received, or whether part or all of the downlink data needs to be retransmitted.
  • the downlink data is delivered by the first network device to the terminal, wherein the first network device and the second network device serve the terminal together, and the terminal has a slave network device from the first network device and the second network device.
  • the second network device is capable of dual receiving and single sending to the second network device. In this way, by sending retransmission information to the second network device, the second network device will forward the retransmission information to the first network device through the X2 interface, and the first network device will perform a new transmission or retransmission based on the retransmission information or feedback information, This will help improve the HARQ mechanism, improve the reliability of data transmission, and help improve the eMBB solution when applied in cell handover scenarios.
  • the retransmission information is hybrid automatic repeat request HARQ feedback information.
  • the HARQ feedback information includes a time domain resource index and first indication information, the time domain resource index is used to indicate a time domain resource for transmitting the downlink data, and the first indication information is used to indicate whether the downlink data is received success. Since the inter-station transmission between the first network device and the second network device may have a large delay, the second network device forwards the retransmission information to the first network device with a large delay, and time domain resources are used.
  • the index can clearly indicate which downlink data is successfully received and which downlink data is not successfully received, and it is better to schedule new transmission or retransmission of downlink data that fails to be received.
  • the time domain resource index includes one or more of the following: frame number, subframe number, and short transmission time interval sTTI index number.
  • the first indication information includes correct ACK information or incorrect NACK information.
  • the downlink data includes one or more transport blocks TB
  • the first indication information is used to indicate whether each TB of the one or more TBs is successfully received. That is, each TB uses an ACK/NACK message to indicate whether the TB is successfully received.
  • receiving downlink scheduling assistance information from the terminal the downlink scheduling assistance information is used to assist the first network device to perform downlink scheduling on the terminal; and sending the downlink scheduling information to the first network device Scheduling auxiliary information.
  • the first network device can determine the downlink data that the terminal fails to receive according to the HARQ feedback information received from the second network device, and send the downlink data that has failed to be received by the terminal in a new transmission mode according to the downlink scheduling assistance information.
  • the downlink scheduling assistance information includes one or more of the following information: channel state information, measurement report, reference signal received power, reference signal received quality, signal to interference and noise ratio, downlink transmission repetition times, Redundancy version RV or modulation and coding method for downlink transmission.
  • the downlink scheduling auxiliary information can help the first network device to send downlink data that the terminal fails to receive in a new transmission manner to the terminal.
  • the HARQ feedback information includes an HARQ process identifier and second indication information
  • the HARQ process identifier is used to indicate the HARQ process for transmitting the downlink data
  • the second indication information is used to indicate the downlink data Whether the reception is successful.
  • the second indication information includes correct ACK information or incorrect NACK information.
  • part of the bits in the HARQ process identifier is the RV field in the downlink control information DCI; and/or, part of the bits in the HARQ process identifier is the NDI field in the downlink control information DCI.
  • the downlink data includes one or more transport blocks TB
  • the second indication information is used to indicate whether each TB of the one or more TBs is successfully received, and one of the TBs occupies One HARQ process; for each of the one or more TBs, multiple repeated data is indicated by one ACK/NACK information.
  • a conversion message is sent to the terminal, where the conversion message is used to instruct the terminal to send the HARQ feedback information to the second network device when a condition is met.
  • a method for transmitting retransmission information is provided.
  • the execution subject of the method is a network device, which can be recorded as a second network device.
  • the method includes: receiving a high-level status report for a first network device from a terminal; sending the high-level status report to the first network device; wherein the first network device and the second network device serve the terminal together, and
  • the terminal has the capability of dual receiving from the first network device and the second network device and single sending to the second network device.
  • a conversion message is sent to the terminal, where the conversion message is used to instruct the terminal to send a high-level status report for the first network device to the second network device when a condition is met.
  • the high-level status report includes a radio link control RLC status report and/or a packet data aggregation protocol PDCP status report.
  • a device for transmitting retransmission information has the function of realizing any possible design of the fifth aspect, the sixth aspect, and the fifth aspect and any possible design of the sixth aspect.
  • the function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the device can be a chip or an integrated circuit.
  • the device includes a transceiver and a processor, the transceiver is used to communicate with other communication devices, and the processor is used to couple with the memory to execute the program stored in the memory.
  • the device can The method described in any possible design of the fifth aspect, the sixth aspect, and the fifth aspect and any possible design of the sixth aspect are implemented.
  • the device also includes a memory for storing programs executed by the processor.
  • the device is a network device or an access network device or a base station.
  • a chip is provided, the chip is connected to a memory or the chip includes a memory, and is used to read and execute a software program stored in the memory, so as to implement the above-mentioned fifth, sixth, and fifth aspects. Any possible design or the method described in any possible design of the sixth aspect.
  • a communication system in a ninth aspect, includes a terminal and a network device.
  • the terminal is used to implement any of the above-mentioned first aspect, second aspect, any possible design of the first aspect, and any possible design of the second aspect.
  • the method, and/or, the network device is used to execute the method in any possible design of the fifth aspect, sixth aspect, and any possible design of the fifth aspect and any possible design of the sixth aspect.
  • a computer storage medium which stores a computer program, and the computer program includes instructions for executing the foregoing aspects and any possible design method in each aspect.
  • a computer program product containing instructions which when run on a computer, causes the computer to execute the above-mentioned aspects and the methods described in any possible design of the aspects.
  • Figure 1 is a schematic diagram of the system architecture in an embodiment of the application
  • FIG. 2 is one of the schematic flowcharts of a method for transmitting retransmission information in an embodiment of this application;
  • FIG. 3 is the second schematic diagram of the flow of a method for transmitting retransmission information in an embodiment of this application;
  • FIG. 4 is one of the schematic flowcharts of the method for transmitting retransmission information in a cell handover scenario in an embodiment of the application;
  • Fig. 5 is a second schematic diagram of the flow of a method for transmitting retransmission information in a cell handover scenario in an embodiment of the application;
  • FIG. 6 is one of the schematic structural diagrams of the retransmission information transmission device in an embodiment of this application.
  • FIG. 7 is the second structural diagram of the retransmission information transmission device in the embodiment of this application.
  • the embodiments of the present application provide a method and device for retransmitting information, which are used to improve the HARQ mechanism in the eMBB solution.
  • the method and the device are based on the same concept. Since the principles of the method and the device to solve the problem are similar, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.
  • "and/or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, and both A and B exist at the same time. There are three cases of B.
  • the character "/" generally indicates that the associated objects are in an "or” relationship.
  • At least one involved in this application refers to one or more; multiple involved refers to two or more.
  • words such as “first” and “second” are only used for the purpose of distinguishing description, and cannot be understood as indicating or implying relative importance, nor can it be understood as indicating Or imply the order.
  • FIG. 1 shows the architecture of a possible communication system to which the method for cell handover provided in an embodiment of the present application is applicable.
  • the communication system 100 includes: one or more network devices 101 and a terminal 102.
  • the network device 101 is a device with a wireless transceiver function or a chip that can be installed in the device.
  • the device includes but is not limited to: evolved Node B (eNB), radio network controller (RNC), Node B (Node B, NB), base station controller (BSC), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (baseband unit, BBU), the access point (AP), wireless relay node, wireless backhaul node, and transmission point (transmission and reception point, TRP or transmission) in the wireless fidelity (WIFI) system point, TP), etc., it can also be a gNB in a 5G (such as NR) system, or a transmission point (TRP or TP), one or a group of (including multiple antenna panels) antenna panels of a base station in a 5G system, or It can also be a network node that constitutes a gNB or a transmission point, such as a baseband unit (BBU), or a distributed unit (DU).
  • eNB evolved Node
  • the gNB may include a centralized unit (CU) and a DU.
  • the gNB may also include a radio unit (RU).
  • CU implements some functions of gNB
  • DU implements some functions of gNB, for example, CU implements radio resource control (radio resource control, RRC), packet data convergence protocol (packet data convergence protocol, PDCP) layer functions
  • DU implements wireless link
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • DU implements wireless link
  • RLC radio link control
  • MAC media access control
  • PHY physical
  • the network device may be a CU node, or a DU node, or a device including a CU node and a DU node.
  • the CU can be divided into network equipment in the access network RAN, and the CU can also be divided into network equipment in the core network CN, which is not limited here.
  • the terminal can also be called user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, terminal equipment, wireless communication equipment, user Agent or user device.
  • the terminal in the embodiment of this application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, and an augmented reality (AR) terminal device , Wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, transportation safety (transportation) Wireless terminals in safety), wireless terminals in smart cities, and wireless terminals in smart homes.
  • the embodiment of this application does not limit the application scenario.
  • a terminal with a wireless transceiver function and a chip that can be installed in the aforementioned terminal are collectively referred to as a terminal.
  • the transmission method of retransmission information provided in the embodiments of this application can be applied to various communication systems, such as: long term evolution (LTE) system, worldwide interoperability for microwave access (WiMAX) communication system, Fifth generation (5th Generation, 5G) systems, such as new-generation radio access technology (NR), and future communication systems, such as 6G systems.
  • LTE long term evolution
  • WiMAX worldwide interoperability for microwave access
  • 5G Fifth generation
  • NR new-generation radio access technology
  • future communication systems such as 6G systems.
  • the method provided in this application can be applied to scenarios where the terminal has the ability to support single-transmit and dual-receive, and of course can also be applied to terminals with higher capabilities, for example, the terminal has the ability of dual-receive and dual-transmit.
  • single-transmit and dual-receive means that when the terminal is connected to two network devices, it can receive downlink data/signals from the two network devices, and can only send uplink data/signals to one of the two network devices at any time .
  • the connection of a terminal to two network devices means that the two network devices jointly serve the terminal.
  • the terminal has the ability to keep the terminal connected to both the source cell and the target cell during the handover process, until the terminal and the target cell complete the random access process before disconnecting from the source cell, or the terminal is triggered by other means Disconnect from the source cell.
  • the terminal is handed over from the source cell to the target cell.
  • the network equipment to which the source cell belongs exchanges information or data with the terminal.
  • the network equipment to which the source cell belongs can be called the source base station, and the network equipment to which the target cell belongs can be It is called the target base station.
  • the information/data interaction between the terminal and the source cell can be understood as the information/data interaction between the terminal and the source base station.
  • the information/data interaction between the terminal and the target cell can be understood as the information/data interaction between the terminal and the target base station.
  • the terminal switching from the source cell to the target cell can be understood as the terminal switching from connecting with the source base station to connecting with the target base station.
  • the above connection may refer to a radio resource control (Radio Resource Control, RRC) connection.
  • RRC Radio Resource Control
  • the terminal maintains an RRC connection with the cell or base station, and can exchange information or data with the cell or base station.
  • RRC Radio Resource Control
  • This application relates to when a terminal switches from a source base station to a target base station, the source base station and the target base station may belong to the same communication system or may belong to different communication systems.
  • the source base station and the target base station are LTE base stations, or the source base station and the target base station are NR base stations, or the source base station is an LTE base station and the target base station is an NR base station, or the source base station is an NR base station and the target base station is an LTE base station.
  • the two network devices connected by the terminal are marked as the first network device and the second network device.
  • the terminal can receive downlink data from the two network devices, but can only send uplink data to one network device.
  • the terminal can only send uplink data to the second network device.
  • the prior art method has a defect.
  • the terminal After receiving the downlink data from the first network device, the terminal cannot directly send HARQ feedback information to the first network device.
  • the HARQ feedback information is also called downlink data feedback information.
  • the first network device cannot perform data retransmission through HARQ feedback information.
  • the terminal can send HARQ feedback information to the second network device, and forward the HARQ feedback information to the first network device through the second network device, and the first network device performs a new transmission based on the HARQ feedback information. Or retransmission, so as to help improve the HARQ mechanism, improve the reliability of data transmission, and help improve the eMBB solution when applied in cell handover scenarios.
  • the first network device is the source base station and the second network device is the target base station.
  • the first network device sends downlink data to the terminal, and the terminal receives the downlink data from the first network device.
  • the downlink data described here may include one or more data packets, or in other words, include one or more transport blocks (transport block, TB).
  • transport block transport block
  • S202 The terminal sends HARQ feedback information to the second network device, and the second network device receives the HARQ feedback information from the terminal.
  • the HARQ feedback information is used to indicate whether the downlink data described in S201 is successfully received, and specifically indicates whether one or more TBs in the downlink data are successfully received.
  • the HARQ feedback information includes at least one of ACK information and NACK information.
  • the terminal receives the downlink data from the first network device. When the TB arrives at the terminal, the terminal checks the TB. If the reception is correct, it will feed back ACK information, and if it is wrong, it will feed back NACK information. It can indicate whether the reception is successful for each TB in the downlink data.
  • the terminal may send an RRC message or a media access layer control element (MAC Control Element, MAC CE) to the second network device, and the HARQ feedback information is carried in the RRC message or MAC CE.
  • MAC Control Element MAC Control Element
  • the second network device forwards the HARQ feedback information to the first network device, and the first network device receives the HARQ feedback information from the second network device.
  • the terminal sends HARQ feedback information to the second network device, and forwards the HARQ feedback information to the first network device through the second network device, so that the first network device can be made the first
  • the network device learns the HARQ feedback information, so that the first network device can send the failed data to the terminal.
  • the first network device can send and receive failed data to the terminal in two ways. One is new transmission and the other is retransmission. Based on these two methods, the HARQ-based retransmission modes in this application may include two, denoted as HARQ mode one and HARQ mode two.
  • the first network device receives the HARQ feedback information sent by the second network device, it sends the failed data to the terminal based on the newly transmitted data.
  • the method of newly transmitting data requires the first network device to perform downlink scheduling to the terminal, so the first network device needs to obtain information for assisting downlink scheduling, or referred to as downlink scheduling auxiliary information.
  • the terminal sends downlink scheduling assistance information to the second network device.
  • the second network device After receiving the downlink scheduling auxiliary information from the terminal, the second network device forwards the downlink scheduling auxiliary information to the first network device.
  • the downlink scheduling assistance information may be transmitted together with HARQ feedback information.
  • the downlink scheduling assistance information can include the following forms.
  • the downlink scheduling auxiliary information may be several types of measurement information used by the terminal to measure the first network device. For example, channel state information (channel State Information, CSI). Since the CSI is time-sensitive, the CSI information will become invalid after timeout. Therefore, the CSI information as the downlink scheduling auxiliary information is suitable for scenarios where the communication delay between stations is short. Inter-station communication is the communication between the first network device and the second network device. Another example is some high-level measurement results, including reference signal received power (RSRP), reference signal received quality (RSRQ), or signal to interference plus noise ratio (SINR), The high-level measurement results are suitable for scenarios with large transmission delays between stations.
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • SINR signal to interference plus noise ratio
  • the downlink scheduling assistance information may also be the recommended value of the scheduling parameter, for example, the number of repetitions of the downlink transmission, the redundancy version, or the modulation and coding scheme (MCS).
  • the first network device may perform downlink scheduling with reference to the recommended value of the scheduling parameter.
  • the first network device determines the downlink data that the terminal fails to receive according to the HARQ feedback information received from the second network device, and sends the downlink data that has failed to be received by the terminal according to the downlink scheduling auxiliary information to the terminal in a new transmission manner.
  • the information format of the HARQ feedback information includes time domain resource index and indication information.
  • the time domain resource index refers to the time domain resource where the first network device sends downlink data to the terminal, or the time domain resource where the terminal receives the downlink data sent by the first network device.
  • the time domain resource index includes frame number and/or subframe number. If the first network device uses a short transmission time interval (sTTI), the time domain resource index may also include the sTTI sequence number, and the indication information is used to indicate whether the downlink data is successfully received. If successful, the indication information is ACK information, and if unsuccessful, the indication information is NACK information.
  • the sTTI sequence number or sTTI index number refers to the time domain resource where the first network device sends downlink data to the terminal, or the time domain resource where the terminal receives the downlink data sent by the first network device.
  • the time domain resource index includes frame number and/or subframe number. If the first network device uses a short transmission time interval (sTTI), the time domain
  • the terminal will feed back HARQ feedback information only when it receives one or more data packets/TB of the first network device. That is, the downlink data may include one or more TBs.
  • the terminal packs the results of the TB received on multiple subframes into a message for feedback.
  • the information format of the HARQ feedback information can be ⁇ SFN x+subframe y+ACK/NACK ⁇ , which means that the result of the downlink data received on the frame number x subframe number y is ACK/NACK.
  • the result of downlink data received on frame number 1 and subframe number 2 is ACK, which is represented by ⁇ SFN 1+subframe 2+ACK ⁇ .
  • the information format of the HARQ feedback information can be ⁇ SFN x+subframe y+sTTI k+ACK/NACK ⁇ , which means that the result of the downlink data received on the frame number x subframe number y and the sTTI sequence number k is ACK/NACK.
  • the terminal receives one or more TBs in one subframe or one TTI, and the information format for one TB feedback can refer to the above format. For multiple TBs, the reception results on each TB need to be fed back. At this time, the TB identifier is also carried in the information format of the HARQ feedback information.
  • the information format of HARQ feedback information can be ⁇ SFN x+subframe y+TB1 ACK/NACK+TB2 ACK/NACK ⁇ , which means TB1 received on frame number x subframe number y
  • the result of is ACK/NACK
  • the result of TB2 is ACK/NACK.
  • the result of TB1 received on frame number 1 and subframe number 2 is ACK
  • the result of TB2 is NACK
  • the identities of multiple TBs can be represented by HARQ process IDs.
  • the terminal receives downlink data from the first network device, and the downlink data may include multiple data packets or multiple TBs.
  • the terminal may package the reception results of multiple TBs or multiple data packets, and feed them back to the second network device in a message (that is, HARQ feedback information).
  • the HARQ feedback information includes ⁇ SFN 1, subframe 2, ACK ⁇ , ⁇ SFN 1, subframe 4, NACK ⁇ ,..., ⁇ SFN 2, subframe 5, NACK ⁇ .
  • the upper limit of the number of entries included in each HARQ feedback information may be indicated by the network device or stipulated by the protocol.
  • the first network device After receiving the HARQ feedback information sent by the second network device, the first network device sends the failed data to the terminal based on retransmission.
  • the format of the HARQ feedback information can be improved on the HARQ-based retransmission mechanism in the prior art.
  • the first network device can run N different HARQ processes in parallel when sending downlink data to the terminal, and N process IDs (process IDs) are used to distinguish N different processes.
  • the terminal can determine whether the TBs on the N processes are successfully received through verification, and carry an indication of whether the TBs on the N processes are successfully received in the HARQ feedback information.
  • the information format is ⁇ Process ID x + TB ACK/NACK ⁇ , which means that the TB result received on Process ID x is ACK/NACK.
  • the first network device indicates the process ID to the terminal in the downlink control information (DCI).
  • DCI downlink control information
  • RV redundancy version
  • the DCI sent by the terminal from the first network device Obtain the process ID in the process ID, and generate HARQ feedback information based on the error detection result and the process ID.
  • the HARQ feedback information is forwarded to the first network device through the second network device, if the transmission delay between stations is large, more HARQ processes are required, and the HARQ process can be extended in this application.
  • the DCI information sent by the first network device to the terminal includes multiple fields: process ID, redundancy version RV, and new data indication (NDI).
  • the redundant version RV domain and the NDI domain can be reused.
  • the original process ID and the RV field form a new process ID.
  • the original process ID is used as the high bit (bit) and the RV field is used as the low bit.
  • the NDI field is still used to indicate new transmission or retransmission.
  • the RV field is used to reconstruct the process ID, when the NDI field indicates retransmission, the default redundancy version RV value can be used.
  • the default RV value can be configured by the base station or specified by the protocol, for example, 0/1/2/3 Any number in.
  • the original process ID domain occupies 3 bits and can indicate up to 8 processes.
  • the RV domain occupies 2 bits, and the original process ID and RV domain are reconstructed into a new process ID, a total of 5 bits, which can indicate up to 32 processes.
  • the new process ID can indicate more processes than the original process ID.
  • the original process ID and the NDI field form a new process ID.
  • the original process ID is used as a high bit (bit)
  • the NDI field is used as a low bit.
  • the RV field can use some bits to indicate the new transmission or retransmission, and some bits to indicate the redundancy version.
  • FDD frequency domain duplex
  • the original process ID domain occupies 3 bits and can indicate up to 8 processes.
  • the NDI field has 1 bit, and the original process ID and NDI field are reconstructed into a new process ID, a total of 4 bits, which can indicate up to 16 processes.
  • the new process ID can indicate more processes than the original process ID.
  • the RV domain occupies 2 bits, of which 1 bit is used to indicate new transmission or retransmission, and the other 1 bit indicates the redundancy version.
  • the specific 1bit indicating the redundancy version, the RV value indicated by 0 or 1 respectively is specified by the base station configuration or protocol. Although the number of extended processes is limited in this way, the redundant version is retained.
  • the original process ID, RV domain, and NDI domain form a new process ID, which can also expand the number of processes indicated by the process ID.
  • the downlink transmission of the first network device to the terminal is based on a repetitive pattern, that is, each TB or data packet is repeatedly transmitted multiple times. For each TB, the terminal generates a reception result after receiving multiple data transmissions repeatedly. The terminal uses the HARQ feedback information to feed back the result of whether each TB is successfully received, and the feedback needs to be repeated after multiple transmissions. If the downlink data received by the terminal from the first network device includes multiple TBs, the terminal needs to repeatedly transmit each TB in the multiple TBs, and then generate a reception result for each repeated transmission of the TB. Multiple received results of TB are packaged and sent. One TB occupies one process, and multiple transmissions through one TB are equivalent to extending the time occupied by one process.
  • TB1 is repeatedly transmitted 4 times and TB2 is repeatedly transmitted 4 times
  • TB1 repeated transmission needs to occupy 4 subframes
  • TB2 repeated transmission also needs 4 subframes.
  • the terminal will generate an ACK/NACK message for TB1 only after receiving 4 transmissions of TB1.
  • one process occupies 4 subframes, that is, 4ms
  • 8 processes can occupy 32 subframes, that is, 32ms.
  • the ACK/NACK information of the TB of the first process within 32ms can be transmitted to the first network device through the second network device.
  • This method can alleviate the impact of the large transmission delay between the first network device and the second network device station.
  • the time domain index can also be used to replace the HARQ process.
  • the time domain index may include one or more of frame number, subframe number or sTTI.
  • the information format of HARQ feedback information is ⁇ SFN x+subframe y+sTTI k+TB ACK/NACK ⁇ , where SFN is the frame number and subframe is the subframe number, which means that the frame number is x, the subframe number is y, and sTTI The result of TB received on k is ACK/NACK.
  • the HARQ process ID can be used to identify different TBs. For example, if 2 TBs are transmitted in one subframe, the information format of HARQ feedback information is ⁇ SFN x+subframe y+sTTI k+TB1ACK/NACK+TB2ACK/NACK ⁇ .
  • the first network device may send a conversion message to the terminal, where the conversion message is used to instruct the HARQ mode to be converted to HARQ mode one or HARQ mode two.
  • the existing HARQ mechanism is called HARQ mode zero
  • the terminal after receiving the conversion message from the first network device, the terminal enters HARQ mode one or HARQ mode two from HARQ mode zero, and executes HARQ according to the method described in the above embodiment mechanism.
  • the conversion message may be a dedicated MAC CE or RRC message, which is indicated by display.
  • a default HARQ mode can be activated through the MAC CE header, such as default HARQ mode 1 or default HARQ mode 2.
  • MAC CE payload (payload) is not needed. Instructions.
  • the MAC CE payload can be used to indicate the specific HARQ mode, for example, the mode index number or mode name indication method.
  • the conversion message is an RRC message, and the RRC message may indicate to activate a new HARQ mode, or which HARQ mode to enable, for example, using the mode index number or mode name indication mode.
  • the trigger mechanism for sending HARQ feedback information for downlink data to the second network device includes two possible implementation manners.
  • the terminal may start a timer in response to the conversion message when receiving the conversion message, which is recorded as the first timer. After the first timer expires, triggering the sending of HARQ feedback information for the downlink data to the second network device. After the first timer expires, the terminal restarts the first timer or clears the first timer.
  • the first timer can be used to periodically report HARQ feedback information for downlink data.
  • the terminal may also trigger the sending of HARQ feedback information for downlink data to the second network device according to the number of downlink scheduling times or when the number of TBs reaches a threshold. Specifically, when the terminal determines that the number of times of receiving the downlink scheduling of the first network device reaches the first threshold, or when it determines that the number of TBs issued by the first network device reaches the second threshold, it triggers the sending of HARQ for downlink data to the second network device. Feedback.
  • the start time of the counting can be specified by the protocol or based on the displayed message indication, for example, the counting starts from the moment when the conversion message is received.
  • Triggering to send HARQ feedback information for downlink data to the second network device includes packaging and sending the unreported downlink data reception result for the first network device.
  • the above two possible implementations can be used in combination. For example, when the number of downlink scheduling times or the number of TBs reaches a threshold, the report is triggered and the first timer is restarted. For another example, when the number of downlink scheduling times or the number of TBs does not reach the threshold for a long time, but the first timer expires, the report will also be triggered, and the first timer will be restarted.
  • the combination of the two trigger mechanisms can improve reporting efficiency and avoid reporting delays.
  • an embodiment of the present application also provides another method for transmitting retransmission information, as shown in FIG. 3, and the specific process is as follows.
  • a high-level status report for the first network device is sent to the second network device.
  • the high-level status report includes at least one of radio link control (RLC) and packet data aggregation protocol (packet data convergence protocol, PDCP) status reports.
  • RLC radio link control
  • PDCP packet data aggregation protocol
  • the terminal starts a timer, which is recorded as a second timer.
  • the second network device forwards the high-level status report to the first network device, and the first network device receives the high-level status report from the second network device.
  • the threshold here is recorded as the third threshold.
  • Packet loss refers to the number of missed PDUs.
  • the second network device forwards the high-level status report to the first network device, and the first network device receives the high-level status report from the second network device.
  • the RLC if the RLC is working in acknowledged mode (AM), it can feed back the RLC status report and retransmit through the RLC layer, and it can also be combined with the PDCP layer for retransmission; if the RLC works in unacknowledged mode (UM) , Only the PDCP status report can be sent, and retransmission is performed through the PDCP layer.
  • AM acknowledged mode
  • UM unacknowledged mode
  • the method shown in FIG. 3 can also be considered as a kind of HARQ mode, denoted as HARQ mode three.
  • HARQ mode three the terminal does not send HARQ feedback information, nor does it receive new transmission or retransmission of physical layer downlink data from the first network device, but adopts a method of accelerating high-layer (RLC/PDCP) retransmission.
  • RLC/PDCP accelerating high-layer
  • the first network device sends a conversion message to the terminal, and the conversion message is used to instruct the HARQ mode to be converted from HARQ mode zero to HARQ mode 1, HARQ mode 2 or HARQ Mode three.
  • the conversion message can be a dedicated MAC CE or RRC message, which is indicated by display.
  • a MAC CE header can be used to indicate a default HARQ mode, such as default HARQ mode 1, default HARQ mode 2, or default HARQ mode 3. In this case, MAC CE is not required Payload to indicate.
  • the MAC CE payload can be used to indicate the specific HARQ mode, for example, the mode index number or mode name indication method.
  • the conversion message is an RRC message, and the RRC message may indicate which HARQ mode is enabled, for example, the mode index number or mode name indication mode is adopted.
  • the terminal when receiving the conversion message, can start the second timer in response to the conversion message. After the second timer expires, the sending of the RLC/PDCP status report to the second network device is triggered. After the second timer expires, the terminal restarts the second timer or clears the second timer.
  • the second timer can be used to report the RLC/PDCP status report periodically.
  • the foregoing manners in which the number of lost packets reaches the threshold or the second timer expires to trigger reporting can be used in combination. For example, when the number of lost packets reaches the third threshold, the report is triggered and the second timer is restarted. For another example, when the number of lost packets does not reach the third threshold for a long time, but the second timer will time out, the time out of the second timer will trigger the report, and the second timer will be restarted.
  • the combination of the two trigger reporting mechanisms can improve reporting efficiency and avoid reporting delays.
  • the value of some parameters such as the timing duration of the first timer, the timing duration of the second timer, the first threshold, the second threshold and the third threshold, and the configuration information of repeated transmission (such as RV value) can be set by the network device.
  • Instructions or agreement requirements For example, in a cell handover scenario, the first network device is the source base station, and the second network device is the target base station. The above information is carried in the handover command and sent by the source to the terminal.
  • the source base station can directly add this information to the handover command, or the source base station sends to the target base station during the handover preparation process, and the target base station adds this information to the content contained in the handover confirmation message (container)
  • the target base station is added to the handover command and the source base station indicates in the handover command.
  • the target base station sends to the terminal after the terminal completes random access to the target base station.
  • the following takes the application scenario of cell handover as an example, where the first network device is the source base station and the second network device is the target base station.
  • the method for transmitting the retransmission information provided by this application is further described with reference to FIGS. 4 and 5.
  • the terminal maintains connections with both the source base station and the target base station during the handover process.
  • the terminal can receive downlink data/signals from the source base station and the target base station, but can only send uplink data/signals to the target base station at any time.
  • the source base station and the target base station have a direct communication interface.
  • the protocol version supported by the source base station and the target base station are the same.
  • the source base station sends downlink data to the terminal, and the terminal receives the downlink data from the source base station.
  • the terminal sends HARQ feedback information to the target base station, and the target base station receives the HARQ feedback information from the terminal.
  • the HARQ feedback information includes information on whether the downlink data received from the source base station is successfully received. For the specific functions and meanings of the HARQ feedback information, refer to the above description.
  • the target base station forwards the HARQ feedback information to the source base station, and the source base station receives the HARQ feedback information from the target base station.
  • the transmission method of retransmission information in the eMBB scenario is as follows.
  • S501 The terminal sends capability information to the source base station, and the source base station receives the capability information from the terminal.
  • the capability information is used to indicate that the terminal has the capability of dual-receiving and single-transmitting and can receive downlink data from the source base station and the target base station, but can only send uplink data to the target base station at any time.
  • S502 The terminal sends a measurement report to the source cell, and the source cell receives the measurement report from the terminal.
  • the measurement report is the measurement result of the terminal on multiple neighboring cells.
  • S503 The source cell makes a handover decision.
  • S504 The source cell sends a handover request to the target cell, and the target cell receives the handover request from the source cell.
  • the target base station returns a handover confirmation message to the source base station, and the source cell receives the handover confirmation message from the target base station.
  • S507 The source cell sends a handover command to the terminal, and the terminal receives the handover command from the source cell.
  • the handover command can carry the value of some parameters, such as the timing duration of the first timer, the timing duration of the second timer, the first threshold, the second threshold and the third threshold, the configuration information for repeated transmission (such as RV value), etc.
  • the value of the parameter such as the timing duration of the first timer, the timing duration of the second timer, the first threshold, the second threshold and the third threshold, the configuration information for repeated transmission (such as RV value), etc.
  • S508 The terminal sends a random access preamble to the target cell, and the target cell receives the random access preamble from the terminal.
  • the target cell returns a random access response message to the terminal, and the terminal receives the random access response message from the target cell.
  • the target cell After detecting the preamble sent by the terminal, the target cell sends a random access response message to the terminal.
  • steps S508 and S509 may be omitted.
  • S510 The terminal sends a handover complete message to the target cell, and the target cell receives the handover complete message from the terminal.
  • the terminal After receiving the handover complete message, the terminal completes the random access process, establishes an RRC connection with the target cell, and transmits user data with the source base station and the target base station. For example, receiving downlink data from the source base station and the target base station.
  • the source base station sends a conversion message to the terminal, and the terminal receives the conversion message from the source base station.
  • the terminal sends HARQ feedback information to the target base station, and the target base station receives the HARQ feedback information from the terminal.
  • the HARQ feedback information indicates whether the downlink data received by the terminal from the source base station is successfully received.
  • the target base station forwards the HARQ feedback information to the source base station, and the source base station receives the HARQ feedback information from the target base station.
  • an embodiment of the present application further provides a retransmission information transmission device 600, which has the functions performed by the terminal or network device in the foregoing method embodiment.
  • the function of the operation. This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the retransmission information transmission device 600 includes a processing unit 601 and a communication unit 602.
  • the communication unit 602 is configured to perform the sending and/or receiving steps in the method embodiment.
  • the processing unit 601 is used to perform other steps except sending and receiving.
  • the communication unit 602 may include a sending unit and/or a receiving unit.
  • the retransmission information transmission device 600 may be a terminal, or a chip or a functional module inside the terminal.
  • the communication device 900 is used to perform operations performed by the terminal in the foregoing method embodiment:
  • the communication unit 602 is configured to receive downlink data from the first network device; and send the HARQ feedback information of the hybrid automatic repeat request for the downlink data to the second network device.
  • the communication unit 602 is further configured to send downlink scheduling assistance information to the second network device, where the downlink scheduling assistance information is used to assist the first network device to perform downlink scheduling on the terminal.
  • the retransmission information transmission device 600 may be a network device, or a chip or a functional module inside the network device.
  • the processing unit 601 Used to schedule the communication unit 602 to communicate with other devices. Specifically, it is used to receive the HARQ feedback information of the hybrid automatic repeat request for downlink data from the terminal, and send the HARQ feedback information to the first network device.
  • processing unit 601 and the communication unit 602 may also perform other corresponding operations in the foregoing method embodiments, and details are not described herein again.
  • an embodiment of the present application also provides a retransmission information transmission device 700, which is used to implement the terminal and/or terminal in the foregoing method embodiment. Or operations performed by network devices.
  • FIG. 7 only shows the main components of the retransmission information transmission device 700.
  • the retransmission information transmission device 700 includes: a transceiver 701, a processor 702, and a memory 703.
  • the memory 703 is optional.
  • the transceiver 701 is used to transmit messages or signaling with other communication devices.
  • the processor 702 is coupled with the memory 703 and is used to call a program in the memory 703. When the program is executed, the processor 702 executes the above method embodiments. Operations performed by the terminal and/or network device.
  • the memory 703 is used to store a program executed by the processor 702.
  • the transceiver 701 may include a transmitter and/or a receiver, which respectively implement the transceiver function.
  • the number of processors 702 may be one or more.
  • the memory 703 may be located in the processor 702 or may exist separately.
  • the functional module processing unit 601 in FIG. 6 can be implemented by the processor 702, and the communication unit 602 can be implemented by the transceiver 701.
  • FIG. 7 only shows a memory and a processor. In actual terminals and/or network devices, there may be multiple processors and memories.
  • the memory may also be referred to as a storage medium or a storage device, etc., which is not limited in the embodiment of the present application.
  • the processor 702 is mainly used to process communication protocols and communication data, and to control the entire terminal and/or network equipment, execute software programs, and process data of the software programs, for example, to support the terminal and/or network equipment to execute the above methods The actions described in the embodiment.
  • the memory 703 is mainly used to store software programs and data.
  • the processor 702 When performing the function of the terminal, for example, the processor 702 performs the following operations: scheduling the transceiver 701 to receive downlink data from the first network device, and sending to the second network device a hybrid automatic repeat request HARQ feedback information for the downlink data .
  • the processor 702 When performing the function of the network device, for example, the processor 702 performs the following operations: scheduling the transceiver 701 to receive the HARQ feedback information of the hybrid automatic repeat request for downlink data from the slave terminal, and sending the HARQ feedback to the first network device information.
  • the processor 702 may also perform other operations or functions performed by the terminal or network device in the foregoing method embodiments, and the repetitions are not described again.
  • the retransmission information transmission device 700 is a base station.
  • the base station may include one or more radio frequency units, such as a remote radio unit (RRU) and one or more baseband units (BBU) (or BBU). It is called a digital unit (DU)).
  • the RRU may be called a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and it may include at least one antenna and a radio frequency unit.
  • the RRU part is mainly used for receiving and sending radio frequency signals and converting radio frequency signals and baseband signals.
  • the BBU part is mainly used to perform baseband processing, control the base station, and so on.
  • the RRU and BBU may be physically set together, or physically separated, that is, a distributed base station.
  • the BBU is the control center of the base station, and may also be called a processing unit, which is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading.
  • the BBU processing unit
  • the BBU may be used to control the base station to execute the operation procedure of the network device in the foregoing method embodiment.
  • the BBU may be composed of one or more single boards, and multiple single boards may jointly support a radio access network with a single access indication (such as an LTE network), or may respectively support different access standards.
  • Wireless access network (such as LTE network, 5G network or other network).
  • the BBU further includes a memory 703 and a processor 702, and the memory 703 is used to store necessary instructions and data.
  • the processor 702 is used to control the base station to perform necessary actions, for example, to control the base station to execute the operation procedure of the network device in the foregoing method embodiment.
  • the memory and processor may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.
  • the processor 702 may be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and an NP.
  • CPU central processing unit
  • NP network processor
  • the processor 702 may further include a hardware chip.
  • the aforementioned hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof.
  • ASIC application-specific integrated circuit
  • PLD programmable logic device
  • the above-mentioned PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL) or any combination thereof.
  • CPLD complex programmable logic device
  • FPGA field-programmable gate array
  • GAL generic array logic
  • the memory 703 may include a volatile memory (volatile memory), such as a random-access memory (random-access memory, RAM); the memory 703 may also include a non-volatile memory (non-volatile memory), such as a flash memory (flash memory). memory), a hard disk drive (HDD) or a solid-state drive (SSD); the memory 703 may also include a combination of the foregoing types of memories.
  • volatile memory such as a random-access memory (random-access memory, RAM
  • non-volatile memory such as a flash memory (flash memory).
  • flash memory flash memory
  • HDD hard disk drive
  • SSD solid-state drive
  • the retransmission information transmission device 700 is not limited to the above-mentioned form, and may also be in other forms: for example, including BBU and adaptive radio unit (ARU), or BBU and active antenna
  • the unit active antenna unit, AAU); it can also be a customer premises equipment (CPE), or it can be in other forms, which is not limited in this application.
  • CPE customer premises equipment
  • an embodiment of the present application further provides a chip, including a processor, for supporting the communication device to implement the functions related to the terminal or network device in the foregoing method embodiment .
  • the chip is connected to a memory or the chip includes a memory, and the memory is used to store the necessary program instructions and data of the communication device.
  • the embodiment of the present application provides a computer storage medium storing a computer program, and the computer program includes instructions for executing the foregoing method embodiments.
  • the embodiments of the present application provide a computer program product containing instructions, which when run on a computer, cause the computer to execute the foregoing method embodiments.
  • the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.
  • a computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device.
  • the device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing functions specified in a flow or multiple flows in the flowchart and/or a block or multiple blocks in the block diagram.

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Abstract

一种重传信息的传输方法及装置，用于实现针对双收单发能力的终端传输下行数据的反馈信息。该方法包括：从第一网络设备接收下行数据；向第二网络设备发送针对所述下行数据的混合自动重传请求HARQ反馈信息；其中，所述第一网络设备和所述第二网络设备为终端共同服务，所述终端具有从所述第一网络设备和所述第二网络设备双接收且向所述第二网络设备单发送的能力。

Description

一种重传信息的传输方法及装置 技术领域
本申请涉及通信技术领域，特别涉及一种重传信息的传输方法及装置。
背景技术
在无线通信系统中，当终端移动时，根据信号强度的变化或者网络侧的负载均衡的需求，可能会发生服务小区的切换，从源小区切换到目标小区。为降低切换过程中的数据传输中断时间，现有技术提出了一种连接维持(make-before-break，MBB)技术，当终端接收到切换命令后，不立即中断与源小区的连接，而是继续维持到终端针对目标小区的首次上行传输时刻。例如，在终端收到切换命令后，仍然维持了与源小区的通信，直到终端向目标小区发送随机接入前导码时才中断。这样终端与目标小区的随机接入过程中，数据传输才是中断的状态，这样减少了数据中断的时间。进一步的，提出增强的连接维持(enhanced make before break，eMBB)方案，或称为同时连接切换方案。与MBB方案相比，即使在终端与目标小区的随机接入过程中，终端与源小区的连接也不中断。这样在切换过中，会有一段时间，终端同时与源小区和目标小区保持连接，也可以同时进行数据传输。这样能够达到零切换中断的效果。
eMBB方案需要终端具有同时与两个小区进行上下行传输的能力，但是在某些场景下终端不具备这样的能力。例如，终端只具备双收能力，不具备双发能力，即终端只具备同时接收两个小区下行数据的能力，而不具备同时向两个小区发送上行数据的能力。这时，eMBB方案还不完善，例如，在混合自动重传请求(hybrid automatic retransmission request，HARQ)设计方面，如果终端能够接收源小区的下行数据，但是不能向源小区发送反馈信息(例如HARQ信息)，就会影响数据重传。
发明内容
本申请提供一种重传信息的传输方法，用以解决针对双收单发能力的终端下行数据反馈信息的传输问题。
一方面，提供一种重传信息的传输方法，该方法的执行主体为终端，该方法包括：从第一网络设备接收下行数据；向第二网络设备发送针对所述下行数据的重传信息，该重传信息也可以称为反馈信息，重传信息是用于指示下行数据是否接收成功的，或者用于指示该下行数据的部分或全部是否需要重传的。其中，所述第一网络设备和所述第二网络设备为终端共同服务，所述终端具有从所述第一网络设备和所述第二网络设备双接收且向所述第二网络设备单发送的能力。这样，通过向第二网络设备发送重传信息，第二网络设备会通过X2接口将重传信息转给第一网络设备，第一网络设备根据该重新信息或反馈信息进行新传或者重传，从而有助于完善HARQ机制，提高数传输的可靠性，当应用在小区切换场景时有助于完善eMBB方案。
在一个可能的设计中，该重传信息为混合自动重传请求HARQ反馈信息。所述HARQ反馈信息包括时域资源索引和第一指示信息，所述时域资源索引用于指示传输所述下行数据的时域资源，所述第一指示信息用于指示所述下行数据是否接收成功。由于第一网络设 备和第二网络设备之间的站间传输可能会时延较大，由第二网络设备将重传信息转发给第一网络设备会有很大的时延，采用时域资源索引能够明确的指出哪些下行数据接收成功，哪些下行数据没有接收成功，更好的调度接收失败的下行数据新传或者重传。
在一个可能的设计中，所述时域资源索引包括以下一项或多项：帧号、子帧号和短传输时间间隔sTTI索引号。
在一个可能的设计中，所述第一指示信息包括正确ACK信息或错误NACK信息。
在一个可能的设计中，所述下行数据包括一个或多个传输块TB，或者说下行数据包括一个或多个数据包，所述第一指示信息用于指示所述一个或多个TB中的每一个TB是否接收成功。也就是，每一个TB均用一个ACK/NACK信息来指示该TB是否接收成功。
在一个可能的设计中，向所述第二网络设备发送下行调度辅助信息，所述下行调度辅助信息用于辅助所述第一网络设备对所述终端进行下行调度。这样，第一网络设备根据从第二网络设备接收到的HARQ反馈信息确定终端接收失败的下行数据，根据下行调度辅助信息对终端接收失败的下行数据采用新传的方式发送给终端。
在一个可能的设计中，所述下行调度辅助信息包括以下一项或多项信息：信道状态信息、测量报告、参考信号接收功率、参考信号接收质量、信干噪比、下行传输的重复次数、下行传输的冗余版本RV或调制编码方式。该下行调度辅助信息能够帮助第一网络设备对终端接收失败的下行数据采用新传的方式发送给终端。
在一个可能的设计中，该重传信息为混合自动重传请求HARQ反馈信息。所述HARQ反馈信息包括HARQ进程标识和第二指示信息，HARQ进程标识用于指示传输所述下行数据的HARQ进程，所述第二指示信息用于指示所述下行数据是否接收成功。这种方式能够兼容现有的HARQ重传机制。
在一个可能的设计中，所述第二指示信息包括正确ACK信息或错误NACK信息。
在一个可能的设计中，所述HARQ进程标识中的部分比特为下行控制信息DCI中的RV域；和/或，所述HARQ进程标识中的部分比特为下行控制信息DCI中的NDI域。通过上述方式，能够在不改变原有DCI的格式的基础上，达到扩展进程数的目的。能够缓解第一网络设备和第二网络设备站间传输时延较大的问题带来的影响。
在一个可能的设计中，所述下行数据包括一个或多个传输块TB，所述第二指示信息用于指示所述一个或多个TB中的每一个TB是否接收成功，一个所述TB占用一个HARQ进程；从第一网络设备接收下行数据，包括：针对所述一个或多个TB中的每一个TB，均接收多次。采用每个TB重复传输X次的方式，相当于将原有的HARQ进程数扩展了X倍，达到扩展进程数的目的。能够缓解第一网络设备和第二网络设备站间传输时延较大的问题带来的影响。
在一个可能的设计中，从所述第一网络设备或所述第二网络设备接收转换消息，所述转换消息用于指示所述终端在满足条件时向所述第二网络设备发送所述HARQ反馈信息。通过转换消息指示终端转换HARQ模式。
在一个可能的设计中，响应于接收到所述转换消息，启动定时器；在所述定时器超时后，向第二网络设备发送针对所述下行数据的HARQ反馈信息。采用该第一定时器能够实现周期性地上报针对下行数据的HARQ反馈信息。
在一个可能的设计中，确定接收所述第一网络设备下行调度的次数达到第一门限时，向第二网络设备发送针对所述下行数据的HARQ反馈信息；或者，确定接收所述第一网络 设备发送的的TB个数达到第二门限时，向第二网络设备发送针对所述下行数据的HARQ反馈信息。
在一个可能的设计中，计数的起始时刻可以由协议规定，或基于显示的消息指示，例如从接收到转换消息时刻开始计数。
在一个可能的设计中，接收所述第一网络设备下行调度的次数达到第一门限、以及接收所述第一网络设备发送的的TB个数达到第二门限时的方法，可以和第一定时器计时的方法进行结合，通过两种触发机制的结合，能提高上报效率，并避免上报延迟。
第二方面，提供一种重传信息传输方法，该方法的执行主体可以是终端，该方法包括：从第一网络设备接收下行数据；在满足条件时，向第二网络设备发送针对第一网络设备的高层状态报告；其中，所述第一网络设备和所述第二网络设备为终端共同服务，所述终端具有从所述第一网络设备和所述第二网络设备双接收且向所述第二网络设备单发送的能力。通过该方法，能够在无法向第一网络设备反馈下行数据的接收结果时，通过加速高层数据重传的方式，有助于保证第一网络设备向终端的下行数据传输的稳定性和可靠性。
在一个可能的设计中，在定时器超时后，向第二网络设备发送针对第一网络设备的高层状态报告；和/或，在丢包数到达门限时，向第二网络设备针对第一网络设备的高层状态报告。采用该定时器能够实现周期性地上报高层状态报告。采用丢包数到达门限的触发方式，能够结合丢包及时反馈高层状态报告，以及时收到高层的重传数据。通过两种方式结合，能提高上报效率，并避免上报延迟。
在一个可能的设计中，从所述第一网络设备或所述第二网络设备接收转换消息，所述转换消息用于指示所述终端在满足条件时，向第二网络设备发送针对第一网络设备的高层状态报告。
在一个可能的设计中，响应于接收到所述转换消息，启动定时器。
在一个可能的设计中，高层状态报告包括无线链路控制RLC状态报告和/或分组数据聚合协议PDCP状态报告。其中，如果RLC工作在应答模式(acknowledged mode，AM)，可以反馈RLC状态报告，通过RLC层实现重传，还可以结合PDCP层进行重传；如果RLC工作在非应答模式(unacknowledged mode，UM)，只能发送PDCP状态报告，通过PDCP层进行重传。
第三方面，提供一种重传信息的传输装置，该装置具有实现上述第一方面、第二方面、第一方面的任一种可能的设计和第二方面任一种可能的设计的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
在一个可能的设计中，该装置可以是芯片或者集成电路。
在一个可能的设计中，该装置包括收发器和处理器，收发器用于与其他通信设备进行通信，处理器用于与存储器进行耦合，执行存储器存储的程序，当程序被执行时，所述装置可以执行上述一方面、第二方面、第一方面的任一种可能的设计和第二方面任一种可能的设计中所述的方法。
在一个可能的设计中，该装置还包括存储器，用于存储处理器执行的程序。
在一个可能的设计中，该装置为终端。
第四方面，提供一种芯片，该芯片与存储器相连或者该芯片包括存储器，用于读取并执行所述存储器中存储的软件程序，以实现如上述第一方面、第二方面、第一方面的任一 种可能的设计或第二方面的任一种可能的设计中所述的方法。
第五方面，提供一种重传信息传输方法，该方法的执行主体为网络设备，可以记为第二网络设备设备。该方法包括：从终端接收针对下行数据的重传信息，向所述第一网络设备发送该重传信息。该重传信息也可以称为反馈信息，重传信息是用于指示下行数据是否接收成功的，或者用于指示该下行数据的部分或全部是否需要重传的。所述下行数据为第一网络设备向所述终端下发的，其中，所述第一网络设备和第二网络设备为终端共同服务，所述终端具有从所述第一网络设备和所述第二网络设备双接收且向所述第二网络设备单发送的能力。这样，通过向第二网络设备发送重传信息，第二网络设备会通过X2接口将重传信息转给第一网络设备，第一网络设备根据该重新信息或反馈信息进行新传或者重传，从而有助于完善HARQ机制，提高数传输的可靠性，当应用在小区切换场景时有助于完善eMBB方案。
在一个可能的设计中，该重传信息为混合自动重传请求HARQ反馈信息。所述HARQ反馈信息包括时域资源索引和第一指示信息，所述时域资源索引用于指示传输所述下行数据的时域资源，所述第一指示信息用于指示所述下行数据是否接收成功。由于第一网络设备和第二网络设备之间的站间传输可能会时延较大，由第二网络设备将重传信息转发给第一网络设备会有很大的时延，采用时域资源索引能够明确的指出哪些下行数据接收成功，哪些下行数据没有接收成功，更好的调度接收失败的下行数据新传或者重传。
在一个可能的设计中，所述时域资源索引包括以下一项或多项：帧号、子帧号和短传输时间间隔sTTI索引号。
在一个可能的设计中，所述第一指示信息包括正确ACK信息或错误NACK信息。
在一个可能的设计中，所述下行数据包括一个或多个传输块TB，所述第一指示信息用于指示所述一个或多个TB中的每一个TB是否接收成功。也就是，每一个TB均用一个ACK/NACK信息来指示该TB是否接收成功。
在一个可能的设计中，从所述终端接收下行调度辅助信息，所述下行调度辅助信息用于辅助所述第一网络设备对所述终端进行下行调度；向所述第一网络设备发送该下行调度辅助信息。这样，能够使得第一网络设备根据从第二网络设备接收到的HARQ反馈信息确定终端接收失败的下行数据，根据下行调度辅助信息对终端接收失败的下行数据采用新传的方式发送给终端。
在一个可能的设计中，所述下行调度辅助信息包括以下一项或多项信息：信道状态信息、测量报告、参考信号接收功率、参考信号接收质量、信干噪比、下行传输的重复次数、下行传输的冗余版本RV或调制编码方式。该下行调度辅助信息能够帮助第一网络设备对终端接收失败的下行数据采用新传的方式发送给终端。
在一个可能的设计中，所述HARQ反馈信息包括HARQ进程标识和第二指示信息，HARQ进程标识用于指示传输所述下行数据的HARQ进程，所述第二指示信息用于指示所述下行数据是否接收成功。这种方式能够兼容现有的HARQ重传机制。
在一个可能的设计中，所述第二指示信息包括正确ACK信息或错误NACK信息。
在一个可能的设计中，所述HARQ进程标识中的部分比特为下行控制信息DCI中的RV域；和/或，所述HARQ进程标识中的部分比特为下行控制信息DCI中的NDI域。通过上述方式，能够在不改变原有DCI的格式的基础上，达到扩展进程数的目的。能够缓解第一网络设备和第二网络设备站间传输时延较大的问题带来的影响。
在一个可能的设计中，所述下行数据包括一个或多个传输块TB，所述第二指示信息用于指示所述一个或多个TB中的每一个TB是否接收成功，一个所述TB占用一个HARQ进程；针对所述一个或多个TB中的每一个TB，多次重复的数据用一个ACK/NACK信息指示。采用每个TB重复传输X次的方式，相当于将原有的HARQ进程数扩展了X倍，达到扩展进程数的目的。能够缓解第一网络设备和第二网络设备站间传输时延较大的问题带来的影响。
在一个可能的设计中，向所述终端发送转换消息，所述转换消息用于指示所述终端在满足条件时向所述第二网络设备发送所述HARQ反馈信息。
第六方面，提供一种重传信息传输方法，该方法的执行主体为网络设备，可以记为第二网络设备设备。该方法包括：从终端接收针对第一网络设备的高层状态报告；向所述第一网络设备发送该高层状态报告；其中，所述第一网络设备和第二网络设备为终端共同服务，所述终端具有从所述第一网络设备和所述第二网络设备双接收且向所述第二网络设备单发送的能力。通过该方法，能够在无法向第一网络设备反馈下行数据的接收结果时，通过加速高层数据重传的方式，有助于保证第一网络设备向终端的下行数据传输的稳定性和可靠性。
在一个可能的设计中，向所述终端发送转换消息，所述转换消息用于指示所述终端在满足条件时，向所述第二网络设备发送针对第一网络设备的高层状态报告。
在一个可能的设计中，高层状态报告包括无线链路控制RLC状态报告和/或分组数据聚合协议PDCP状态报告。
第七方面，提供一种重传信息的传输装置，该装置具有实现上述第五方面、第六方面、第五方面的任一种可能的设计和第六方面任一种可能的设计的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
在一个可能的设计中，该装置可以是芯片或者集成电路。
在一个可能的设计中，该装置包括收发器和处理器，收发器用于与其他通信设备进行通信，处理器用于与存储器进行耦合，执行存储器存储的程序，当程序被执行时，所述装置可以执行上述第五方面、第六方面、第五方面的任一种可能的设计和第六方面任一种可能的设计中所述的方法。
在一个可能的设计中，该装置还包括存储器，用于存储处理器执行的程序。
在一个可能的设计中，该装置为网络设备或接入网设备或基站。
第八方面，提供一种芯片，该芯片与存储器相连或者该芯片包括存储器，用于读取并执行所述存储器中存储的软件程序，以实现如上述第五方面、第六方面、第五方面的任一种可能的设计或第六方面的任一种可能的设计中所述的方法。
第九方面，提供了一种通信系统，该通信系统包括终端和网络设备，终端用于执行上述第一方面、第二方面、第一方面任一可能设计和第二方面任一可能设计中的方法，和/或，网络设备用于执行上述第五方面、第六方面、第五方面任一可能设计和第六方面任一可能设计中的方法。
第十方面，提供一种计算机存储介质，存储有计算机程序，该计算机程序包括用于执行上述各方面和各方面的任一可能的设计中方法的指令。
第十一方面，提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得 计算机执行上述各方面和各方面的任一可能的设计中所述的方法。
附图说明
图1为本申请实施例中系统架构示意图；
图2为本申请实施例中重传信息的传输方法流程示意图之一；
图3为本申请实施例中重传信息的传输方法流程示意图之二；
图4为本申请实施例中小区切换场景下重传信息的传输方法流程示意图之一；
图5为本申请实施例中小区切换场景下重传信息的传输方法流程示意图之二；
图6为本申请实施例中重传信息传输装置结构示意图之一；
图7为本申请实施例中重传信息传输装置结构示意图之二。
具体实施方式
本申请实施例提供一种重传信息的方法及装置，用于完善eMBB方案中的HARQ机制。方法和装置是基于同一构思的，由于方法及装置解决问题的原理相似，因此装置与方法的实施可以相互参见，重复之处不再赘述。本申请实施例的描述中，“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。本申请中所涉及的至少一个是指一个或多个；涉及的多个，是指两个或两个以上。另外，需要理解的是，在本申请的描述中，“第一”、“第二”等词汇，仅用于区分描述的目的，而不能理解为指示或暗示相对重要性，也不能理解为指示或暗示顺序。
下面将结合附图，对本申请实施例进行详细描述。
图1示出了本申请实施例提供的小区切换的方法适用的一种可能的通信系统的架构，参阅图1所示，该通信系统100包括：一个或多个网络设备101、和终端102。网络设备101为具有无线收发功能的设备或可设置于该设备的芯片，该设备包括但不限于：演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(baseband unit，BBU)，无线保真(wireless fidelity，WIFI)系统中的接入点(access point，AP)、无线中继节点、无线回传节点、传输点(transmission and reception point，TRP或者transmission point，TP)等，还可以为5G(如NR)系统中的gNB，或，传输点(TRP或TP)，5G系统中的基站的一个或一组(包括多个天线面板)天线面板，或者，还可以为构成gNB或传输点的网络节点，如基带单元(BBU)，或，分布式单元(distributed unit，DU)等。
在一些部署中，gNB可以包括集中式单元(centralized unit，CU)和DU。gNB还可以包括射频单元(radio unit，RU)。CU实现gNB的部分功能，DU实现gNB的部分功能，比如，CU实现无线资源控制(radio resource control，RRC)，分组数据汇聚层协议(packet data convergence protocol，PDCP)层的功能，DU实现无线链路控制(radio link control，RLC)、媒体接入控制(media access control，MAC)和物理(physical，PHY)层的功能。由于RRC层的信息最终会变成PHY层的信息(即通过PHY层发送)，或者，由PHY层 的信息转变而来，因而，在这种架构下，高层信令，如RRC层信令或PDCP层信令，也可以认为是由DU发送的，或者，由DU+RU发送的。可以理解的是，网络设备可以为CU节点、或DU节点、或包括CU节点和DU节点的设备。此外，CU可以划分为接入网RAN中的网络设备，也可以将CU划分为核心网CN中的网络设备，在此不做限制。
终端也可以称为用户设备(user equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端设备、无线通信设备、用户代理或用户装置。本申请的实施例中的终端可以是手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等等。本申请的实施例对应用场景不做限定。本申请中将具有无线收发功能的终端及可设置于前述终端的芯片统称为终端。
本申请实施例提供的重传信息的传输方法可以应用于各种通信系统，例如：长期演进(long term evolution，LTE)系统，全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统，第五代(5th Generation，5G)系统，如新一代无线接入技术(new radio access technology，NR)，及未来的通信系统，如6G系统等。
需要说明的是，本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
本申请提供的方法可以适用于终端具有支持单发双收的能力的场景，当然也可以适用于具有更高能力的终端，例如，终端具有双收双发的能力。其中，单发双收是指终端连接两个网络设备时，能够从两个网络设备接收下行数据/信号，且在任意时刻只能向两个网络设备中的其中一个网络设备发送上行数据/信号。终端连接两个网络设备是指，该两个网络设备共同服务于该终端。例如在eMBB方案中，终端具有能力使得终端在切换过程与源小区和目标小区均保持连接，直到终端与目标小区完成随机接入过程后再断开与源小区的连接，或通过其他触发方式终端断开与源小区的连接。在小区切换的相关过程，终端从源小区切换到目标小区，源小区所属的网络设备与终端进行信息交互或数据交互，源小区所属的网络设备可以称为源基站，目标小区所属的网络设备可以称为目标基站。终端与源小区进行的信息/数据交互可以理解为终端与源基站进行的信息/数据交互。终端与目标小区进行的信息/数据交互可以理解为终端与目标基站进行的信息/数据交互。终端从源小区切换到目标小区可以理解为终端从与源基站连接切换到与目标基站连接。上述连接可以是指无线资源控制(radio resource control，RRC)连接。终端与小区或基站保持RRC连接，就可以与小区或基站进行信息交互或数据交互。本申请涉及终端在源基站到目标基站的切换时，源基站和目标基站可以属于同一种通信系统，也可以属于不同的通信系统。例如，源基站和目标基站为LTE基站，或者，源基站和目标基站为NR基站，或者，源基站为LTE基站、目标基站为NR基站，或者，源基站为NR基站、目标基站为LTE基站。
为方便说明，终端连接的两个网络设备记为第一网络设备和第二网络设备。当终端与两个网络设备均保持连接时，终端可以从两个网络设备接收下行数据，但仅能够向一个网 络设备发送上行数据。例如，终端仅能够向第二网络设备发送上行数据。这种情况下现有技术的方法存在一个缺陷，终端从第一网络设备接收下行数据后，并不能直接向第一网络设备发送HARQ反馈信息，HARQ反馈信息或称为下行数据反馈信息，这样导致第一网络设备不能通过HARQ反馈信息进行数据重传。基于此，本申请的发明思想是，终端可以向第二网络设备发送HARQ反馈信息，通过第二网络设备向第一网络设备转发该HARQ反馈信息，第一网络设备根据该HARQ反馈信息进行新传或者重传，从而有助于完善HARQ机制，提高数传输的可靠性，当应用在小区切换场景时有助于完善eMBB方案。当应用在小区切换场景时，例如，第一网络设备为源基站，第二网络设备为目标基站。
下面详细介绍一下本申请提供的重传信息的传输方法。
如图2所示，本申请提供的重传信息的传输方法的具体流程如下所述。
S201、第一网络设备向终端发送下行数据，终端从第一网络设备接收下行数据。
这里所述的下行数据可以包括一个或多个数据包，或者说包括一个或多个传输块(transport block，TB)，以下用TB进行举例说明。
S202、终端向第二网络设备发送HARQ反馈信息，第二网络设备从终端接收该HARQ反馈信息。
该HARQ反馈信息用于指示S201所述的下行数据是否接收成功，具体的指示该下行数据中的一个或多个TB是否接收成功。该HARQ反馈信息包括ACK信息和NACK信息中的至少一种。终端从第一网络设备接收下行数据，当TB到达终端时，终端对该TB进行校验，如果接收正确，则反馈ACK信息，如果错误，则反馈NACK信息。可以针对下行数据中的每一个TB均指示是否接收成功。
终端可以向第二网络设备发送RRC消息或者媒体接入层控制单元(MAC Control Element，MAC CE)，在该RRC消息或MAC CE中携带该HARQ反馈信息。
S203、第二网络设备向第一网络设备转发该HARQ反馈信息，第一网络设备从第二网络设备接收该HARQ反馈信息。
以上方法中，终端向第二网络设备发送HARQ反馈信息，通过第二网络设备向第一网络设备转发该HARQ反馈信息，能够在终端不具有向第一网络设备发送上行的情况下，使得第一网络设备获知HARQ反馈信息，从而使得第一网络设备能够向终端发送接收失败的数据。
第一网络设备向终端发送接收失败的数据，可以通过两种方式实现。一种是新传，另一种是重传。基于这两种方式，本申请中基于HARQ的重传模式可以包括两种，记为HARQ模式一和HARQ模式二。
在HARQ模式一下，第一网络设备接收到第二网络设备发送的HARQ反馈信息后，基于新传数据的方式向终端发送接收失败的数据。新传数据的方式需要第一网络设备向终端进行下行调度，所以第一网络设备需要获得辅助下行调度的信息，或称为下行调度辅助信息。基于此，终端向第二网络设备发送下行调度辅助信息。第二网络设备从终端接收到下行调度辅助信息后，向第一网络设备转发该下行调度辅助信息。可选的，该下行调度辅助信息可以与HARQ反馈信息一起传输。
下行调度辅助信息可以包括以下几种形式。
下行调度辅助信息可以是终端测量第一网络设备的几种测量信息。例如，信道状态信息(channel State Information，CSI)。由于CSI具有时效性，超时后该CSI信息将会失效， 因此CSI信息作为下行调度辅助信息适用于站间通信时延较短的场景。站间通信即第一网络设备和第二网络设备之间的通信。又例如一些高层的测量结果，包括参考信号接收功率(reference signal received power，RSRP)、参考信号接收质量(reference signal received quality，RSRQ)或信干噪比(signal to interference plus noise ratio，SINR)，高层的测量结果适合站间传输时延较大的场景。
下行调度辅助信息还可以是调度参数的推荐值，例如，下行传输的重复次数、冗余版本或调制编码方式(modulation and coding scheme，MCS)。第一网络设备可以参考调度参数的推荐值进行下行调度。
这样，第一网络设备根据从第二网络设备接收到的HARQ反馈信息确定终端接收失败的下行数据，根据下行调度辅助信息对终端接收失败的下行数据采用新传的方式发送给终端。
下面介绍在HARQ模式一下HARQ反馈信息的信息格式。该HARQ反馈信息的信息格式包括时域资源索引和指示信息。其中，时域资源索引是指第一网络设备向终端发送下行数据所在的时域资源，或者是终端接收到第一网络设备发送的下行数据的时域资源。时域资源索引包括帧号和/或子帧号。如果第一网络设备使用短时间传输间隔(short transmission time interval，sTTI)，该时域资源索引还可以包括sTTI序号，指示信息用于指示下行数据是否接收成功。若成功，则指示信息为ACK信息，若不成功，则指示信息为NACK信息。sTTI序号或称为sTTI索引号。一般情况下，终端在接收到第一网络设备的一个或多个数据包/TB时，才会反馈HARQ反馈信息。即，该下行数据可能包括一个或多个TB。终端将多个子帧上接收的TB的结果打包成一个消息进行反馈。针对一个子帧上接收的TB的结果来说，HARQ反馈信息的信息格式可以为{SFN x+subframe y+ACK/NACK}，表示在帧号x子帧号y上接收的下行数据的结果为ACK/NACK。例如，在帧号1子帧号2上接收的下行数据的结果为ACK，用{SFN 1+subframe 2+ACK}表示。如果包括sTTI序号，则HARQ反馈信息的信息格式可以为{SFN x+subframe y+sTTI k+ACK/NACK}，表示在帧号x子帧号y以及sTTI序号k上接收的下行数据的结果为ACK/NACK。有些场景下，终端在一个子帧或一个TTI上接收到一个或多个TB，针对一个TB反馈的信息格式可以参照上面的格式。针对多个TB来说，需要对每一个TB上的接收结果均进行反馈。此时在HARQ反馈信息的信息格式中还要携带TB的标识。例如，一个子帧上接收2个TB，HARQ反馈信息的信息格式可以为{SFN x+subframe y+TB1 ACK/NACK+TB2 ACK/NACK}，表示在帧号x子帧号y上接收的TB1的结果为ACK/NACK，TB2的结果为ACK/NACK。假设在帧号1子帧号2上接收的TB1的结果为ACK，TB2的结果为NACK，则用{SFN 1+subframe 2+TB1 ACK+TB2 NACK}表示。其中，多个TB的标识可以用HARQ进程ID来表示。
终端从第一网络设备接收到下行数据，该下行数据可能包括多个数据包或多个TB。终端可以将多个TB或多个数据包的接收结果进行打包，在一个消息(即HARQ反馈信息)中反馈给第二网络设备。举个例子，该HARQ反馈信息包括{SFN 1，subframe 2，ACK}，{SFN 1，subframe 4，NACK}，…，{SFN 2，subframe 5，NACK}。其中，每个HARQ反馈信息中包含的条目数上限可以由网络设备指示或者协议规定。
在HARQ模式二下，第一网络设备接收到第二网络设备发送的HARQ反馈信息后，基于重传的方式向终端发送接收失败的数据。HARQ反馈信息的格式可以在现有技术基于 HARQ的重传机制上做改进。第一网络设备向终端发送下行数据可以并行运行N个不同的HARQ进程，采用N个进程标识(process ID)来区分N个不同的进行。终端可以通过校验，确定N个进程上的TB是否接收成功，并在HARQ反馈信息中携带N个进程上的TB是否接收成功的指示。例如采用信息格式为{Process ID x+TB ACK/NACK}，表示在Process ID x上接收的TB结果为ACK/NACK。第一网络设备在下行控制信息(downlink control information，DCI)中向终端指示process ID，可选的，还可以指示相应的冗余版本(redundant version，RV)，终端从第一网络设备发送的DCI中获取process ID，根据检错结果和process ID生成HARQ反馈信息。
由于HARQ反馈信息是通过第二网络设备向第一网络设备转发的，因此若站间传输时延较大的话，需要较多的HARQ进程，本申请中可以对HARQ进程进行扩展。
现有的，第一网络设备向终端发送的DCI信息中包括多个域：process ID、冗余版本RV和新数据指示(new data indication，NDI)。本申请中可以复用冗余版本RV域和NDI域。例如，将原有的process ID和RV域构成新的process ID，可选的，原有的process ID作为高比特(bit)位，RV域作为低比特位。这种情况下NDI域仍然用于指示新传或重传。由于RV域用于重构进程ID，当NDI域指示重传时，可以使用默认的冗余版本RV值，该默认的RV值可以由基站配置或者协议规定，例如采用0/1/2/3中的任意一个数字。以频分双工(frequency domain duplex，FDD)为例，原有的process ID域占3bit，最多能指示8个进程。RV域占2bit，将原有的process ID和RV域重构成新的process ID，共5bit，最多可以指示32个进程。新的process ID较原有的process ID能够指示更多的进程。
又例如，将原有的process ID和NDI域构成新的process ID，可选的，原有的process ID作为高比特(bit)位，NDI域作为低比特位。这种情况下RV域可以用部分比特指示新传或重传，部分比特指示冗余版本。以频分双工(frequency domain duplex，FDD)为例，原有的process ID域占3bit，最多能指示8个进程。NDI域有1个比特，将原有的process ID和NDI域重构成新的process ID，共4bit，最多可以指示16个进程。新的process ID较原有的process ID能够指示更多的进程。RV域占2bit，其中1bit用于指示新传或重传，另外1bit指示冗余版本。具体的指示冗余版本的1bit，0或1分别指示的RV值由基站配置或协议规定。这种方式虽然扩展的进程数有限，但是保留了冗余版本。
或者，将原有的process ID、RV域和NDI域构成新的process ID，也能够扩大process ID指示的进程数目。
通过上述方式，能够在不改变原有DCI的格式的基础上，达到扩展进程数的目的。
本申请中除了上述对HARQ进程进行扩展的方法外，还可以通过重复传输的方式来解决站间时延较大带来的进程数不够的问题。
第一网络设备向终端的下行传输基于重复模式，重复模式即每个TB或数据包均重复传输多次。终端针对每个TB，在接收到重复传输的多次数据后，生成一个接收结果。终端通过HARQ反馈信息反馈每个TB是否接收成功的结果，则需要在重复传输多次后才能反馈。如果终端从第一网络设备接收的下行数据包括多个TB，则终端需要在多个TB中每一个TB均重复传输多次后，针对每一个TB的重复传输均生成一个接收结果，将多个TB的多个接收结果打包发送。一个TB占用一个进程，通过一个TB的多次传输相当于扩展了一个进程占用的时间。
例如，TB1重复传输4次，TB2重复传输4次，则TB1重复传输需要占用4个子帧， TB2重复传输也需要占用4个子帧。则终端在接收4次传输的TB1后，才会生成一个针对TB1的ACK/NACK信息。以最多8个HARQ进程为例，一个进程占用4个子帧，即4ms，则8个进程可占用32个子帧，即32ms。在32ms内第一个进程的TB的ACK/NACK信息能够通过第二网络设备传送到第一网络设备即可。
通过该方法，能够缓解第一网络设备和第二网络设备站间传输时延较大的问题带来的影响。
可选的，类似于HARQ模式一下HARQ反馈信息的信息格式，在HARQ模式一下为了降低对存储器的需求，还可以用时域索引来代替HARQ进程。其中时域索引可以包括帧号、子帧号或sTTI中的一个或多个。例如，HARQ反馈信息的信息格式为{SFN x+subframe y+sTTI k+TB ACK/NACK}，其中SFN是帧号，subframe是子帧号，表示帧号为x、子帧号为y、sTTI为k上接收的TB结果为ACK/NACK。若一个子帧上传输多个TB，则需要反馈每个TB的接收结果。可以用HARQ进程ID标识不同的TB。例如，一个子帧上传输2个TB，HARQ反馈信息的信息格式为{SFN x+subframe y+sTTI k+TB1ACK/NACK+TB2ACK/NACK}。
第一网络设备可以向终端发送转换消息，该转换消息用于指示将HARQ模式转换为HARQ模式一或HARQ模式二。如果现有的HARQ机制称为HARQ模式零，则终端从第一网络设备接收到该转换消息后，从HARQ模式零进入HARQ模式一或HARQ模式二，并按照上述实施例所述的方法执行HARQ机制。其中，该转换消息可以是专用的MAC CE或RRC消息，通过显示方式指示。例如，转换消息为MAC CE，可以通过MAC CE头(header)来激活一种默认的HARQ模式，如默认HARQ模式一或默认HARQ模式二，这种情况下可以不需要MAC CE负载(payload)来指示。当然，如果系统同时支持多种HARQ模式，可以通过MAC CE payload指示具体采用哪种HARQ模式，例如采用模式索引号或模式名称的指示方式。又例如，转换消息为RRC消息，RRC消息可以指示激活新HARQ模式，或使能哪一种HARQ模式，例如采用模式索引号或模式名称的指示方式。
另外，向第二网络设备发送针对下行数据的HARQ反馈信息的触发机制包括两种可能的实现方式。
在一种可能的实现方式中，终端可以在接收到该转换消息时，响应于该转换消息，启动一个定时器，记为第一定时器。在第一定时器超时后，触发向第二网络设备发送针对下行数据的HARQ反馈信息。终端在第一定时器超时后，重启该第一定时器，或将第一定时器清零。采用该第一定时器能够实现周期性地上报针对下行数据的HARQ反馈信息。
在另一种可能的实现方式中，终端也可以根据下行调度次数或TB个数达到门限时，触发向第二网络设备发送针对下行数据的HARQ反馈信息。具体地，终端判定接收第一网络设备下行调度的次数达到第一门限时，或者判定第一网络设备下发的TB个数达到第二门限时，触发向第二网络设备发送针对下行数据的HARQ反馈信息。计数的起始时刻可以由协议规定，或基于显示的消息指示，例如从接收到转换消息时刻开始计数。
触发向第二网络设备发送针对下行数据的HARQ反馈信息，包括将未上报的针对第一网络设备的下行数据的接收结果进行打包，并进行发送。
上述两种可能的实现方式可以结合使用。例如在下行调度次数或TB个数达到门限时，触发上报并重启第一定时器。又例如，下行调度次数或TB个数长时间未达到门限时，但是第一定时器超时也会触发上报，并重启第一定时器。通过两种触发机制的结合，能提高 上报效率，并避免上报延迟。
基于同一发明构思，本申请实施例还提供了另一种提供的重传信息的传输方法，如图3所示，具体流程如下所述。
S301、同S201。
在满足条件时，向第二网络设备发送针对第一网络设备的高层状态报告。
高层状态报告包括无线链路控制(radio link control，RLC)和分组数据聚合协议(packet data convergence protocol，PDCP)状态报告中的至少一种。
根据条件不同，执行S302～S304，或者执行S302’～S303’。
S302、终端启动定时器，记为第二定时器。
S303、在第二定时器超时后，向第二网络设备发送高层状态报告，第二网络设备从终端接收该高层状态报告。
S304、第二网络设备向第一网络设备转发该高层状态报告，第一网络设备从第二网络设备接收该高层状态报告。
S302’，确定丢包数达到门限时，向第二网络设备发送高层状态报告，第二网络设备从终端接收该高层状态报告。
这里的门限记为第三门限。丢包是指漏掉的PDU个数。
S303’、第二网络设备向第一网络设备转发该高层状态报告，第一网络设备从第二网络设备接收该高层状态报告。
其中，如果RLC工作在应答模式(acknowledged mode，AM)，可以反馈RLC状态报告，通过RLC层实现重传，还可以结合PDCP层进行重传；如果RLC工作在非应答模式(unacknowledged mode，UM)，只能发送PDCP状态报告，通过PDCP层进行重传。
通过该方法，能够在无法向第一网络设备反馈下行数据的接收结果时，通过加速高层数据重传的方式，有助于保证第一网络设备向终端的下行数据传输的稳定性和可靠性。
从另一种角度来看，图3所示的方法也可以认为是一种HARQ模式，记为HARQ模式三。在HARQ模式三下，终端不发送HARQ反馈信息，也不从第一网络设备接收物理层的下行数据新传或重传，而是采用加速高层(RLC/PDCP)重传的方式。
类似的，结合上述HARQ模式一或HARQ模式二的相应方法，第一网络设备向终端发送转换消息，该转换消息用于指示将HARQ模式从HARQ模式零转换为HARQ模式一、HARQ模式二或HARQ模式三。该转换消息可以是专用的MAC CE或RRC消息，通过显示方式指示。例如，转换消息为MAC CE，可以通过MAC CE头(header)来指示一种默认的HARQ模式，如默认HARQ模式一、默认HARQ模式二或默认HARQ模式三，这种情况下可以不需要MAC CE负载(payload)来指示。当然，如果系统同时支持多种HARQ模式，可以通过MAC CE payload指示具体采用哪种HARQ模式，例如采用模式索引号或模式名称的指示方式。又例如，转换消息为RRC消息，RRC消息可以指示使能哪一种HARQ模式，例如采用模式索引号或模式名称的指示方式。
类似的，终端可以在接收到该转换消息时，响应于该转换消息，启动第二定时器。在第二定时器超时后，触发向第二网络设备发送RLC/PDCP状态报告。终端在第二定时器超时后，重启该第二定时器，或将第二定时器清零。采用该第二定时器能够实现周期性地上报RLC/PDCP状态报告。
上述丢包数达到门限或第二定时器超时触发上报的方式可以结合使用。例如在丢包数 达到第三门限时，触发上报并重启第二定时器。又例如，丢包数长时间未达到第三门限时，但是第二定时器会超时，第二定时器超时也会触发上报，并重启第二定时器。通过两种触发上报机制的结合，能提高上报效率，并避免上报延迟。
文中类似第一定时器的计时时长、第二定时器的计时时长、第一门限、第二门限和第三门限、重复传输的配置信息(例如RV值)等一些参数的值均可以由网络设备指示或协议规定。例如，在小区切换场景中，第一网络设备为源基站，第二网络设备为目标基站。上述这些信息携带于切换命令中由源发送给终端。具体地，可以直接由源基站将这些信息添加到切换命令中，或者在切换准备过程中由源基站发送给目标基站，再由目标基站将这些信息添加到切换确认消息所包含的内容(container)中，即由目标基站添加到切换命令中由源基站在切换命令中指示。或者，在终端向目标基站完成随机接入后由目标基站发送给终端。
基于上述描述，下面以小区切换的应用场景为例，第一网络设备为源基站，第二网络设备为目标基站，结合图4和图5对本申请提供的重传信息的传输方法进一步说明。
如图4所示，终端在切换过程中，与源基站和目标基站均保持连接。终端能够从源基站和目标基站接收下行数据/信号，但在任意时刻只能向目标基站发送上行数据/信号。源基站与目标基站具有直接的通信接口。可选的，源基站与目标基站支持的协议版本相同。
S401、源基站向终端发送下行数据，终端从源基站接收下行数据。
S402、终端向目标基站发送HARQ反馈信息，目标基站从终端接收该HARQ反馈信息。
HARQ反馈信息包括从源基站接收的下行数据是否接收成功的信息。具体的HARQ反馈信息的功能和含义参见上文描述。
S403、目标基站向源基站转发该HARQ反馈信息，源基站从目标基站接收该HARQ反馈信息。
如图5所示，在eMBB场景下的重传信息的传输方法如下所述。
S501、终端向源基站发送能力信息，源基站从终端接收该能力信息。
该能力信息用于指示终端具有双收单发的能力，可以从源基站和目标基站接收下行数据，但在任意时刻仅能够向目标基站发送上行数据。
S502、终端向源小区发送测量报告，源小区从终端接收测量报告。
测量报告为终端对多个邻小区的测量结果。
S503、源小区进行切换判决。
S504、源小区向目标小区发送切换请求，目标小区从源小区接收切换请求。
S505、目标基站在接收到切换请求后，进行准入控制。
S506、目标基站向源基站返回切换确认消息，源小区从目标基站接收该切换确认消息。
S507、源小区向终端发送切换命令，终端从源小区接收切换命令。
切换命令中可以携带一些参数的值，例如第一定时器的计时时长、第二定时器的计时时长、第一门限、第二门限和第三门限、重复传输的配置信息(例如RV值)等参数的值。
S508、终端向目标小区发送随机接入前导码，目标小区从终端接收随机接入前导码。
S509、目标小区向终端返回随机接入响应消息，终端从目标小区接收随机接入响应消息。
目标小区在检测到终端发送的前导码后，向终端发送随机接入响应消息。
如果是随机接入信道(random access channel，RACH)-less切换，可以没有步骤S508，S509。
S510、终端向目标小区发送切换完成消息，目标小区从终端接收切换完成消息。
终端在接收到切换完成消息后，完成随机接入过程，与目标小区建立RRC连接，并与源基站与目标基站进行用户数据传输。例如，从源基站和目标基站接收下行数据。
S511、源基站向终端发送转换消息，终端从源基站接收该转换消息。
转换消息的解释如上文所述，在此不再赘述。
S512、终端向目标基站发送HARQ反馈信息，目标基站从终端接收该HARQ反馈信息。
具体的，HARQ反馈信息指示终端从源基站接收的下行数据是否接收成功。
S513、目标基站向源基站转发该HARQ反馈信息，源基站从目标基站接收该HARQ反馈信息。
基于上述方法实施例的同一构思，如图6所示，本申请实施例还提供一种重传信息传输装置600，该重传信息传输装置600具有执行上述方法实施例中终端或网络设备执行的操作的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。例如，该重传信息传输装置600包括处理单元601和通信单元602。通信单元602用于执行方法实施例中发送和/或接收的步骤。处理单元601用于执行除发送接收外的其它步骤。进一步的，通信单元602可以包括发送单元和/或接收单元。
该重传信息传输装置600可以是终端，也可以是终端内部的芯片或功能模块，当该通信装置900用于执行上述方法实施例中终端执行的操作时：
通信单元602，用于从第一网络设备接收下行数据；向第二网络设备发送针对所述下行数据的混合自动重传请求HARQ反馈信息。
可选的，通信单元602，还用于向所述第二网络设备发送下行调度辅助信息，所述下行调度辅助信息用于辅助所述第一网络设备对所述终端进行下行调度。
该重传信息传输装置600可以是网络设备，也可以是网络设备内部的芯片或功能模块，当该重传信息传输装置600用于执行上述方法实施例中网络设备执行的操作时，处理单元601用于调度通信单元602与其他设备通信。具体的用于从终端接收针对下行数据的混合自动重传请求HARQ反馈信息，以及向所述第一网络设备发送该HARQ反馈信息。
可以理解的是，处理单元601和通信单元602还可以执行上述方法实施例中的其他相应操作，在此不再赘述。
基于与上述方法实施例的同一构思，如图7所示，本申请实施例还提供了一种重传信息传输装置700，该重传信息传输装置700用于实现上述方法实施例中终端和/或网络设备执行的操作。图7仅仅示出了重传信息传输装置700的主要部件。
重传信息传输装置700包括：收发器701、处理器702、存储器703。存储器703为可选的。收发器701用于与其它通信设备进行消息或信令的传输，处理器702与存储器703耦合，用于调用存储器703中的程序，当程序被执行时，使得处理器702执行上述方法实施例中终端和/或网络设备执行的操作。存储器703用于存储处理器702执行的程序。收发器701可以包括发射器和/或接收器，分别实现收发功能。处理器702可以为一个或多个。存储器703可以位于处理器702中，也可以单独存在。图6中的功能模块处理单元601可 以通过处理器702来实现，通信单元602可以通过收发器701来实现。本领域技术人员可以理解，为了便于说明，图7仅示出了一个存储器和处理器。在实际的终端和/或网络设备中，可以存在多个处理器和存储器。存储器也可以称为存储介质或者存储设备等，本申请实施例对此不做限制。
处理器702主要用于对通信协议以及通信数据进行处理，以及对整个终端和/或网络设备进行控制，执行软件程序，处理软件程序的数据，例如用于支持终端和/或网络设备执行上述方法实施例中所描述的动作。存储器703主要用于存储软件程序和数据。
当执行终端的功能时，例如，处理器702执行以下操作：调度收发器701从第一网络设备接收下行数据，以及向第二网络设备发送针对所述下行数据的混合自动重传请求HARQ反馈信息。
当执行网络设备的功能时，例如，处理器702执行以下操作：调度收发器701从从终端接收针对下行数据的混合自动重传请求HARQ反馈信息，以及向所述第一网络设备发送该HARQ反馈信息。
处理器702还可以执行上述方法实施例中终端或网络设备执行的其它操作或功能，重复之处不再赘述。
当执行网络设备的功能时，重传信息传输装置700的形态可以如下所述。重传信息传输装置700为一种基站，该基站可包括一个或多个射频单元，如远端射频单元(remote radio unit,RRU)和一个或多个基带单元(baseband unit，BBU)(也可称为数字单元(digital unit，DU))。所述RRU可以称为收发单元、收发机、收发电路、或者收发器等等，其可以包括至少一个天线和射频单元。所述RRU部分主要用于射频信号的收发以及射频信号与基带信号的转换。所述BBU部分主要用于进行基带处理，对基站进行控制等。所述RRU与BBU可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。
所述BBU为基站的控制中心，也可以称为处理单元，主要用于完成基带处理功能，如信道编码，复用，调制，扩频等等。例如所述BBU(处理单元)可以用于控制基站执行上述方法实施例中关于网络设备的操作流程。
在一个实施例中，所述BBU可以由一个或多个单板构成，多个单板可以共同支持单一接入指示的无线接入网(如LTE网络)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其它网)。所述BBU还包括存储器703和处理器702，所述存储器703用于存储必要的指令和数据。所述处理器702用于控制基站进行必要的动作，例如用于控制基站执行上述方法实施例中关于网络设备的操作流程。所述存储器和处理器可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
处理器702可以是中央处理器(central processing unit，CPU)，网络处理器(network processor，NP)或者CPU和NP的组合。
处理器702还可以进一步包括硬件芯片。上述硬件芯片可以是专用集成电路(application-specific integrated circuit，ASIC)，可编程逻辑器件(programmable logic device，PLD)或其组合。上述PLD可以是复杂可编程逻辑器件(complex programmable logic device，CPLD)，现场可编程逻辑门阵列(field-programmable gate array，FPGA)，通用阵列逻辑(generic array logic,GAL)或其任意组合。
存储器703可以包括易失性存储器(volatile memory)，例如随机存取存储器 (random-access memory，RAM)；存储器703也可以包括非易失性存储器(non-volatile memory)，例如快闪存储器(flash memory)，硬盘(hard disk drive，HDD)或固态硬盘(solid-state drive，SSD)；存储器703还可以包括上述种类的存储器的组合。
另外，当执行网络设备的功能时，重传信息传输装置700不限于上述形态，也可以是其它形态：例如：包括BBU和自适应无线单元(adaptive radio unit，ARU)，或BBU和有源天线单元(active antenna unit，AAU)；也可以为客户终端设备(customer premises equipment，CPE)，还可以为其它形态，本申请不限定。
在本申请上述方法实施例描述的终端所执行的操作和功能中的部分或全部，或网络设备所执行的操作和功能中的部分或全部，可以用芯片或集成电路来完成。
为了实现上述图6或图7所述的通信装置的功能，本申请实施例还提供一种芯片，包括处理器，用于支持该通信装置实现上述方法实施例中终端或网络设备所涉及的功能。在一种可能的设计中，该芯片与存储器连接或者该芯片包括存储器，该存储器用于保存该通信装置必要的程序指令和数据。
本申请实施例提供了一种计算机存储介质，存储有计算机程序，该计算机程序包括用于执行上述方法实施例的指令。
本申请实施例提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述方法实施例。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本申请的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本申请范围的所有变更和修改。
显然，本领域的技术人员可以对本申请实施例进行各种改动和变型而不脱离本申请实施例的精神和范围。这样，倘若本申请实施例的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (30)

  1. 一种重传信息传输方法，其特征在于，包括：
    从第一网络设备接收下行数据；
    向第二网络设备发送针对所述下行数据的混合自动重传请求HARQ反馈信息；其中，所述第一网络设备和所述第二网络设备为终端共同服务，所述终端具有从所述第一网络设备和所述第二网络设备双接收且向所述第二网络设备单发送的能力。
  2. 如权利要求1所述的方法，其特征在于，所述HARQ反馈信息包括时域资源索引和第一指示信息，所述时域资源索引用于指示传输所述下行数据的时域资源，所述第一指示信息用于指示所述下行数据是否接收成功。
  3. 如权利要求2所述的方法，其特征在于，所述时域资源索引包括以下一项或多项：帧号、子帧号和短传输时间间隔sTTI索引号。
  4. 如权利要求2或3所述的方法，其特征在于，所述第一指示信息包括正确ACK信息或错误NACK信息。
  5. 如权利要求2～4任一项所述的方法，其特征在于，所述下行数据包括一个或多个传输块TB，所述第一指示信息用于指示所述一个或多个TB中的每一个TB是否接收成功。
  6. 如权利要求1～5任一项所述的方法，其特征在于，所述方法还包括：
    向所述第二网络设备发送下行调度辅助信息，所述下行调度辅助信息用于辅助所述第一网络设备对所述终端进行下行调度。
  7. 如权利要求6所述的方法，其特征在于，所述下行调度辅助信息包括以下一项或多项信息：信道状态信息、测量报告、参考信号接收功率、参考信号接收质量、信干噪比、下行传输的重复次数、下行传输的冗余版本RV或调制编码方式。
  8. 如权利要求1所述的方法，其特征在于，所述HARQ反馈信息包括HARQ进程标识和第二指示信息，HARQ进程标识用于指示传输所述下行数据的HARQ进程，所述第二指示信息用于指示所述下行数据是否接收成功。
  9. 如权利要求8所述的方法，其特征在于，所述第二指示信息包括正确ACK信息或错误NACK信息。
  10. 如权利要求8或9所述的方法，其特征在于，所述HARQ进程标识中的部分比特为下行控制信息DCI中的RV域；和/或，所述HARQ进程标识中的部分比特为下行控制信息DCI中的NDI域。
  11. 如权利要求8～10任一项所述的方法，其特征在于，所述下行数据包括一个或多个传输块TB，所述第二指示信息用于指示所述一个或多个TB中的每一个TB是否接收成功，一个所述TB占用一个HARQ进程；
    从第一网络设备接收下行数据，包括：
    针对所述一个或多个TB中的每一个TB，均接收多次。
  12. 如权利要求1～11任一项所述的方法，其特征在于，所述方法还包括：
    从所述第一网络设备或所述第二网络设备接收转换消息，所述转换消息用于指示所述终端在满足条件时向所述第二网络设备发送所述HARQ反馈信息。
  13. 如权利要求12所述的方法，其特征在于，所述方法还包括：
    响应于接收到所述转换消息，启动定时器；
    向第二网络设备发送针对所述下行数据的HARQ反馈信息，包括：
    在所述定时器超时后，向第二网络设备发送针对所述下行数据的HARQ反馈信息。
  14. 如权利要求1～13任一项所述的方法，其特征在于，向第二网络设备发送针对所述下行数据的HARQ反馈信息，包括：
    确定接收所述第一网络设备下行调度的次数达到第一门限时，向第二网络设备发送针对所述下行数据的HARQ反馈信息；或者，
    确定接收所述第一网络设备发送的的TB个数达到第二门限时，向第二网络设备发送针对所述下行数据的HARQ反馈信息。
  15. 一种重传信息传输方法，其特征在于，包括：
    从第一网络设备接收下行数据；
    在满足条件时，向第二网络设备发送针对第一网络设备的高层状态报告；
    其中，所述第一网络设备和所述第二网络设备为终端共同服务，所述终端具有从所述第一网络设备和所述第二网络设备双接收且向所述第二网络设备单发送的能力。
  16. 如权利要求15所述的方法，其特征在于，在满足条件时，向第二网络设备发送针对第一网络设备的高层状态报告，包括：
    在定时器超时后，向第二网络设备发送针对第一网络设备的高层状态报告；或者，
    在丢包数到达门限时，向第二网络设备针对第一网络设备的高层状态报告。
  17. 如权利要求16所述的方法，其特征在于，所述方法还包括：
    从所述第一网络设备或所述第二网络设备接收转换消息，所述转换消息用于指示所述终端在满足条件时，向第二网络设备发送针对第一网络设备的高层状态报告。
  18. 如权利要求17所述的方法，其特征在于，所述方法还包括：
    响应于接收到所述转换消息，启动定时器。
  19. 如权利要求15～18任一项所述的方法，其特征在于，高层状态报告包括无线链路控制RLC状态报告和/或分组数据聚合协议PDCP状态报告。
  20. 一种重传信息传输方法，其特征在于，包括：
    从终端接收针对下行数据的混合自动重传请求HARQ反馈信息，所述下行数据为第一网络设备向所述终端下发的，其中，所述第一网络设备和第二网络设备为终端共同服务，所述终端具有从所述第一网络设备和所述第二网络设备双接收且向所述第二网络设备单发送的能力；
    向所述第一网络设备发送该HARQ反馈信息。
  21. 如权利要求20所述的方法，其特征在于，所述HARQ反馈信息包括时域资源索引和第一指示信息，所述时域资源索引用于指示传输所述下行数据的时域资源，所述第一指示信息用于指示所述下行数据是否接收成功。
  22. 如权利要求20或21所述的方法，其特征在于，所述方法还包括：
    从所述终端接收下行调度辅助信息，所述下行调度辅助信息用于辅助所述第一网络设备对所述终端进行下行调度；
    向所述第一网络设备发送该下行调度辅助信息。
  23. 如权利要求20所述的方法，其特征在于，所述HARQ反馈信息包括HARQ进程标识和第二指示信息，HARQ进程标识用于指示传输所述下行数据的HARQ进程，所述第二指示信息用于指示所述下行数据是否接收成功。
  24. 如权利要求23所述的方法，其特征在于，所述HARQ进程标识中的部分比特为下行控制信息DCI中的RV域；和/或，所述HARQ进程标识中的部分比特为下行控制信息DCI中的NDI域。
  25. 一种重传信息传输方法，其特征在于，包括：
    从终端接收针对第一网络设备的高层状态报告；
    向所述第一网络设备发送该高层状态报告；
    其中，所述第一网络设备和第二网络设备为终端共同服务，所述终端具有从所述第一网络设备和所述第二网络设备双接收且向所述第二网络设备单发送的能力。
  26. 如权利要求25所述的方法，其特征在于，高层状态报告包括无线链路控制RLC状态报告和/或分组数据聚合协议PDCP状态报告。
  27. 一种通信装置，其特征在于，包括：
    收发器，用于与其它通信设备进行通信；
    处理器，用于与存储器耦合，调用所述存储器中的程序，执行所述程序以实现如权利要求1-19任意一项所述的方法。
  28. 一种计算机可读存储介质，其特征在于，所述计算机存储介质中存储有计算机可读指令，当计算机读取并执行所述计算机可读指令时，使得计算机执行如权利要求1-19任意一项所述的方法。
  29. 一种计算机程序产品，其特征在于，当计算机读取并执行所述计算机程序产品时，使得计算机执行如权利要求1-19任意一项所述的方法。
  30. 一种芯片，其特征在于，所述芯片与存储器相连或者所述芯片包括所述存储器，用于读取并执行所述存储器中存储的软件程序，以实现如权利要求1-19任意一项所述的方法。
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WO2014056198A1 (zh) * 2012-10-12 2014-04-17 华为技术有限公司 Harq反馈的传输方法和装置
CN108112041A (zh) * 2016-11-24 2018-06-01 中国移动通信有限公司研究院 一种切换方法、源基站、目标基站及终端

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