WO2019029399A1 - Procédé de retransmission de données, station de base, terminal, et système - Google Patents

Procédé de retransmission de données, station de base, terminal, et système Download PDF

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Publication number
WO2019029399A1
WO2019029399A1 PCT/CN2018/097788 CN2018097788W WO2019029399A1 WO 2019029399 A1 WO2019029399 A1 WO 2019029399A1 CN 2018097788 W CN2018097788 W CN 2018097788W WO 2019029399 A1 WO2019029399 A1 WO 2019029399A1
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WO
WIPO (PCT)
Prior art keywords
base station
data
ack
punctured
transport block
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Application number
PCT/CN2018/097788
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English (en)
Chinese (zh)
Inventor
苟伟
郝鹏
毕峰
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中兴通讯股份有限公司
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Publication of WO2019029399A1 publication Critical patent/WO2019029399A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—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
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • 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
    • 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

Definitions

  • the present application relates to the field of communications, but is not limited to the field of communications, and specifically relates to a data retransmission method, a base station, a terminal, and a system.
  • New Radio is being researched and standardized, which is one of the current work priorities of 3GPP.
  • eMBB Enhanced Mobile BroadBand
  • URLLC Ultra-Reliable and Low Latency Communications
  • Massive Machine Type Communications massive Machine Type Communications
  • mMTC Massive Machine Type Communications
  • eMBB the emphasis is on high peak transmission rates, low latency requirements (low latency is not required), and moderate reliability requirements.
  • URLLC emphasis is placed on low latency, high reliability transmission, which is very demanding for latency.
  • mMTC a large number of medium terminals are emphasized, the connection density is large and the transmission coverage is required, and there is almost no requirement for delay.
  • a mode of puncturing transmission is introduced in the NR, and the puncturing transmission is mainly introduced to meet the burstiness and timeliness requirements of the URLLC service.
  • the eMBB is transmitted in a slot. If the URLLC service needs to be transmitted suddenly after the transmission, the base station punches the eMBB service and transmits the URLLC service in the punctured position.
  • the puncturing refers to performing puncturing in the time domain and/or the frequency domain for the eMBB being transmitted, for example, omitting two orthogonal frequency division multiplexing (OFDM) and partial physical resources.
  • OFDM orthogonal frequency division multiplexing
  • the block PRB that is, 2 OFDM or part of PRB is selected for transmitting the URLLC service within a predetermined resource range.
  • the base station will notify the user equipment (User Equipment, for short, the UE (for example, the UE of the eMBB), the puncturing indication information is the time domain and frequency domain information describing the punctured area, where The puncturing indication information is used to notify the UE that puncturing occurs, so that when the transport block (Transport Block, TB for short) is retransmitted, the UE needs to start the joint decoding of the TP and the initial TB.
  • the data received in the transmitted punched position is discarded and cannot be combined with the retransmitted data for decoding.
  • a TB contains multiple code blocks (Code Blocks, abbreviated as CB).
  • the code block is a Cyclic Redundancy Check (CRC). If a code block is correctly decoded, it can pass the CRC check. definite.
  • CRC Cyclic Redundancy Check
  • the UE is configured with a TB-based feedback mechanism and a retransmission mechanism, that is, the UE for one TB, if the TB is correctly decoded (the CRC of the TB is passed), the UE feeds back a bit of acknowledgement character (ACK), otherwise A one-bit non-acknowledgment character (Non Acknowledgement character, NACK for short) is fed back. If the UE feeds back a NACK, the base station retransmits the TB. Obviously, under this mechanism, the overhead of UE feeding back ACK/NACK is small and efficient; but when retransmitting, the efficiency of retransmission is low.
  • the feedback mechanism of the UE causes the base station to retransmit the data with low efficiency, and there is no effective solution at present.
  • the embodiment of the present application provides a data retransmission method, a base station, a terminal, and a system.
  • a data retransmission method including: at least one of the following occurs in a process in which a base station sends transport block data to a terminal UE: a transport block TB data sent by the base station to the UE Punching transmission occurs; part or all of the sub-bands used by the base station to transmit the transport block data to the UE are sub-bands that allow puncturing transmission; the base station configures the UE to monitor puncturing indication information; After the at least one of the scenarios, the base station receives an acknowledgement (Acknowledgement, abbreviated as ACK) or a negative acknowledgement (Non Acknowledgement, abbreviated as NACK) information, where the base station receives the ACK, Determining, by the base station, that the UE decoding belongs to one of the following: the UE successfully decodes all CB data including the punctured code block CB in the transport block data; and the UE performs the transport block data All CB data except the punctured
  • ACK acknowledgement
  • NACK negative
  • a method for data retransmission including: a base station exhibiting at least one of the following: a transmission block TB data sent by a base station to a terminal UE is punctured; and the base station is The part or all of the sub-bands used by the UE to transmit the transport block data are sub-bands that allow puncturing transmission; the base station configures the UE to monitor puncturing indication information; after at least one of the situations occurs, the base station receives An ACK or a NACK fed back by the UE, wherein, when the base station receives an ACK, the base station determines that the UE successfully decodes all CB data except the punctured CB in the transport block; Transmitting, by the base station, the retransmission data to the UE according to the ACK or the NACK, where the base station determines whether the CB in the transport block data is punctured by: the base station acquiring the data of the CB punctured a ratio of the quantity to the
  • a method for data retransmission including: in a process in which a terminal UE receives transport block data sent by a base station, at least one of the following occurs: the transport block data received by the UE appears Punching transmission; part or all of the subband in which the data of the transport block received by the UE is located is a subband that allows perforation transmission; the UE is configured to monitor the puncturing indication information; after at least one of the situations occurs, The UE forms a feedback ACK or NACK; wherein the UE forms the ACK to belong to: the UE successfully decodes all CB data except the punctured CB in the transport block; the UE Transmitting the ACK or the NACK to the base station; wherein, the UE determines, according to the puncturing indication information and the resource allocation information sent by the base station, a ratio of the amount of data punched in the punched CB to the total data amount of the CB. And determining, when the ratio is greater than the
  • a method for data retransmission including: in a process in which a terminal UE receives transport block data sent by a base station, at least one of the following occurs: the transport block data received by the UE appears Punching transmission; part or all of the subbands of the data of the transport block received by the UE are subbands that allow perforation transmission; the UE is configured to monitor the puncturing indication information; after at least one of the situations occurs, The UE forms a feedback ACK or NACK; wherein the UE forms the ACK to belong to one of the following cases: In the first case, the UE includes the punctured code block CB in the transport block data. All CB data is successfully decoded; in the second case, the UE successfully decodes all CB data except the punctured CB in the transport block data; the UE sends the ACK or NACK to the Base station.
  • a method for data retransmission including:
  • the data is retransmitted to the UE.
  • a method for data retransmission including:
  • the terminal UE receives the transport block data, and forms an ACK or a NACK according to the agreed rule;
  • a base station including: a first communications apparatus, configured to send transport block data to a terminal UE, and receive an ACK and/or a NACK fed back by the UE, where At least one of the following occurs in the process of the UE transmitting the transport block data: the transport block TB data sent by the base station to the UE is punctured; and the base station sends the transport block data to the UE.
  • the base station configures the UE to monitor the puncturing indication information;
  • the first processor is configured to, after determining to occur at least one of the situations, receive the In the case of ACK, determining that the UE decoding belongs to one of the following: the UE successfully decodes all CB data including the punctured code block CB in the transport block data; the UE pairs the transmission All CB data in the block data except the punctured CB is successfully decoded; and the first processor is further configured to send the UE to the UE by using the first communication device according to the ACK or NACK Pass data.
  • the scenario that occurs also includes one of: the transport block data sent to the UE exhibits a punctured transmission and the base station configures the UE to monitor puncturing indication information; to the UE Some or all of the sub-bands used to transmit the transport block data are sub-bands that allow punctured transmission, and the base station configures the UE to monitor puncturing indication information.
  • the first processor determines, by at least one of the following manners, a situation in which the UE decoding belongs: different resources configured in advance with the UE to be configured in different situations, wherein the UE uses the resource And omitting, by the UE, in advance, when transmitting the ACK, simultaneously transmitting a bit and/or a sequence for indicating an adjacency; and determining, according to at least one of the following information, the ACK attribution: the first Whether the communication device sends the puncturing indication information to the UE; after determining that the puncturing indication information is sent, determining whether the UE has sufficient time to decode the puncturing indication information before feeding back the ACK or NACK.
  • a base station comprising: a second communication device configured to send transport block data to a terminal UE, and receive an ACK and/or a NACK fed back by the UE, where the terminal UE At least one of the following occurs in the process of transmitting the transport block data: the transport block TB data sent by the base station to the UE is punctured; and the base station sends the transport block data to the UE.
  • all subbands are subbands that allow perforation transmission;
  • the base station configures the UE to listen for puncturing indication information; and the second processor is configured to receive the ACK after determining that at least one of the conditions occurs At the time, the UE successfully decodes all CB data except the punctured CB in the transport block; and the second processor is further configured to pass the first communication device according to the ACK or NACK Transmitting, to the UE, retransmission data, where the second processor determines whether the CB in the transport block data is punctured by: obtaining an amount of data of the CB punctured and the total data of the CB Ratio of quantity, , Upon determining that the ratio is greater than a predetermined threshold value, is determined as being the punctured CB CB; upon determining that the ratio is less than or equal to the preset threshold, determine that the CB is not punctured.
  • a terminal comprising: a third communication device configured to receive transport block data transmitted by a base station; and to feed back an ACK and/or a NACK to the base station; In the process of transferring the block data, at least one of the following occurs: the received transport block data has a punctured transmission; part or all of the received sub-band of the transport block data is a sub-band that allows the punctured transmission;
  • the third processor is configured to monitor the puncturing indication information; the third processor is configured to form a feedback ACK or NACK after at least one of the situations occurs; wherein, the situation in which the ACK belongs is formed : successfully decoding all CB data except the punctured CB in the transport block; wherein the third processor determines that the punctured CB is in accordance with the puncturing indication information and the resource allocation information sent by the base station.
  • the ratio of the amount of data to be punctured to the total amount of data of the CB wherein, when it is determined that the ratio is greater than a preset threshold, determining that the CB is a punctured CB; determining that the ratio is less than or equal to When the preset threshold, determine that the CB is not punctured.
  • a terminal comprising: a fourth communication device configured to receive data transmitted by a base station, and to feed back ACK and/or NACK to the base station; wherein receiving the transmission In the process of block data, at least one of the following occurs: the received transport block data has a punctured transmission; some or all of the sub-bands of the received transport block data are sub-bands that allow punctured transmission; the fourth processor The fourth processor is configured to form a feedback ACK or NACK after the occurrence of the at least one of the situations, wherein the case in which the ACK belongs is formed as one of the following: The fourth processor successfully decodes all data including the punctured code block CB; in the second case, the fourth processor successfully decodes data other than the punctured CB.
  • a system for data retransmission including: a base station transmitting transport block data to a UE, wherein at least one of the following occurs in the process of transmitting the transport block data: the base station Punching transmission occurs in the transport block TB data transmitted to the UE; part or all of the sub-bands used by the base station to transmit the transport block data to the UE are sub-bands that allow punching transmission;
  • the UE monitors the puncturing indication information; the UE feeds back an ACK and/or a NACK, where the UE forms the ACK to belong to one of the following situations: in the first case, the UE includes the All CB data including the punctured code block CB is successfully decoded; in the second case, the UE successfully decodes all CB data except the punctured CB in the transport block data; the base station receives And the ACK and/or the NACK, wherein, when the base station receives the ACK, the base station determines, according to the
  • a storage medium comprising a stored program, wherein the program is executed while performing the method described in any of the above alternative embodiments.
  • a processor for running a program wherein the program is executed to perform the method described in any of the above alternative embodiments.
  • the base station receives the ACK or NACK fed back by the UE, where the eNB receives the ACK.
  • the base station determines, according to the ACK, whether the situation in which the UE decoding belongs is the first case or the second case, and then determines whether to retransmit the data and send the retransmitted data according to the manner corresponding to the first situation or the second case. .
  • the above technical solution solves the problem that the UE feedback mechanism causes the base station to retransmit data with low efficiency when the transmitted data is punctured, and the base station does not always retransmit the entire transport block when retransmission is required.
  • the data can transmit part of the data with the punched transmission, which greatly reduces the amount of retransmitted data.
  • FIG. 1 is a block diagram showing the hardware structure of a mobile terminal according to a data retransmission method according to an embodiment of the present application
  • FIG. 2 is a flowchart of a data retransmission method according to an embodiment of the present application
  • FIG. 3 is a schematic diagram of data of a transport block in which punctured transmission occurs according to an embodiment of the present application
  • FIG. 4 is a hardware structural diagram of a base station according to an embodiment of the present application.
  • FIG. 5 is a hardware structural diagram of a terminal according to an embodiment of the present application.
  • the situation is used to indicate a phenomenon that occurs when the base station sends the transmission block data to the terminal, and the scenario is referred to as a background; the situation is used to indicate the information A fed back by the terminal (the information A identifier in the text)
  • the information A is used to indicate the information A fed back by the terminal (the information A identifier in the text)
  • the specific implementation can be seen in Embodiments A, A1, A2 and A3. If the information A is identified as NACK, the corresponding information A indicates the situation in which the terminal decodes.
  • the UE correctly receives the punch. After indicating the information, the UE decodes at least one CB data in the unpunctured CB in the received transport block data (whether or not the punctured CB is correctly decoded), the transport block decoding error; or the UE does not correctly receive the puncturing Indication information (here including UE decoding error, missed reception and unreceived puncturing indication information), transport block decoding error; Case B (here, for distinguishing information A is identified as ACK, here is referred to as Case B), the UE transmits to the receiving All CB data except the punctured CB in the block data is successfully decoded, the punctured CB is not successfully decoded, and the transmission block (the CRC check fails) decoding error.
  • Case B here, for distinguishing information A is identified as ACK, here is referred to as Case B
  • the base station retransmits the entire TB.
  • the base station retransmits the punctured CB.
  • the information A is identified as NACK, it shares the situation when the information A is identified as ACK (five scenarios described below). It shares the method used to distinguish the case A or the case B when the information A is identified as ACK. In the case of no conflict, it can share or combine all the methods when the information A is identified as an ACK.
  • NACK the situation when the information A is identified as ACK (five scenarios described below). It shares the method used to distinguish the case A or the case B when the information A is identified as ACK. In the case of no conflict, it can share or combine all the methods when the information A is identified as an ACK.
  • Embodiment A5 refer to Embodiment A5.
  • a mobile communication network including but not limited to a 5G mobile communication network or a new generation mobile communication system NR
  • the network architecture of the network may include a network side device (for example, a base station) and a terminal.
  • a network side device for example, a base station
  • an information transmission method that can be run on the network architecture is provided. It should be noted that the operating environment of the foregoing information transmission method provided in the embodiment of the present application is not limited to the foregoing network architecture.
  • FIG. 1 is a hardware structural block diagram of a mobile terminal of a data retransmission method according to an embodiment of the present application.
  • the mobile terminal 10 may include one or more (only one shown) processor 102 (the processor 102 may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA).
  • FIG. 1 is merely illustrative and does not limit the structure of the above electronic device.
  • the mobile terminal 10 may also include more or fewer components than those shown in FIG. 1, or have a different configuration than that shown in FIG.
  • the memory 104 can be configured as a software program and a module for storing application software, such as program instructions/modules corresponding to the data retransmission method in the embodiment of the present application, and the processor 102 executes by executing a software program and a module stored in the memory 104.
  • application software such as program instructions/modules corresponding to the data retransmission method in the embodiment of the present application
  • the processor 102 executes by executing a software program and a module stored in the memory 104.
  • Various functional applications and data processing, that is, the above methods are implemented.
  • Memory 104 may include high speed random access memory, and may also include non-volatile memory such as one or more magnetic storage devices, flash memory, or other non-volatile solid state memory.
  • memory 104 may further include memory remotely located relative to processor 102, which may be connected to mobile terminal 10 over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
  • Communication device 106 is configured to receive or transmit data via a network.
  • the above-described network specific example may include a wireless network provided by a communication provider of the mobile terminal 10.
  • communication device 106 includes a Network Interface Controller (NIC) that can be coupled to other network devices via a base station to communicate with the Internet.
  • NIC Network Interface Controller
  • the communication device 106 can be a Radio Frequency (RF) module for communicating with the Internet wirelessly.
  • RF Radio Frequency
  • FIG. 2 is a flowchart of a data retransmission method according to an embodiment of the present application. As shown in FIG. 2, the process includes the following steps:
  • Step S202 At least one of the following occurs in the process of the base station transmitting the transport block data to the terminal UE: the transport block TB data sent by the base station to the UE is punctured, and the base station sends the transmission to the UE. Some or all of the sub-bands used by the block data are sub-bands that allow for puncture transmission; the base station configures the UE to monitor the puncture indication information. It should be added that the puncturing indication information in the present application file is selectively sent by the base station and is not necessarily transmitted. For example, the puncturing indication information is optional for the base station to transmit, that is, the base station may not transmit the opening indication information although the puncturing transmission occurs in some cases. Typically, in the punching transmission, the position of the punching has a small influence on the data of the UE, or the position of the punching is relatively small, and the base station does not send the punching indication information.
  • Step S204 after the at least one of the situations occurs, the base station receives an ACK or a NACK fed back by the UE, where the base station determines that the UE decoding belongs to the first time when the base station receives the ACK.
  • a situation or a second situation The first case includes that the UE successfully decodes all CB data including the punctured code block CB in the transport block data; the second case includes the UE not including the transport block data. All CB data except the punctured CB is successfully decoded. It should be added that the first case may include that the UE successfully decodes all CB data including the punctured code block in the transport block data, and/or the UE determines that the CRC check of the transport block TB decoding passes.
  • Step S206 the base station sends retransmission data to the UE according to the ACK or NACK.
  • the base station receives the ACK or NACK fed back by the UE, where the ACK is received at the base station.
  • the base station determines, according to the ACK, whether the situation in which the UE decoding belongs is the first case or the second case, and then determines whether to retransmit the data and send the retransmitted data according to the manner corresponding to the first situation or the second case. .
  • the above technical solution solves the problem that the UE feedback mechanism causes the base station to retransmit data with low efficiency when the transmitted data is punctured, and the base station does not always retransmit the entire transport block when retransmission is required.
  • the data can transmit part of the data with the punched transmission, which greatly reduces the amount of retransmitted data.
  • the scenario that occurs by the base station further includes: one of the following: the base station sends a punctured transmission to the transport block data sent by the UE, and the base station configures the UE to monitor a puncturing indication Information: the part or all sub-bands used by the base station to send the transport block data to the UE are sub-bands that allow puncturing transmission, and the base station configures the UE to monitor puncturing indication information.
  • the base station determines, by at least one of the following methods, that the UE decoding belongs to:
  • the UE is pre-agreed to different resources configured in different situations, where the UE uses the resource to feed back the ACK; and the supplementary situation is that, in different situations, the foregoing two situations, the UE may feed back an ACK according to two conditions. Configure different resources.
  • the base station sends the puncturing indication information to the UE; after determining that the base station sends the puncturing indication information, the base station determines that the UE is in the feedback Whether there is enough time before decoding the ACK or NACK to decode the puncturing indication information. It should be added that the base station sends the puncturing indication information, and the base station determines whether the UE has enough time to decode the puncturing indication information before the UE sends the ACK according to the sending moment of the puncturing indication, the UE processing capability, and the time when the UE sends the ACK.
  • the UE may exclude the punctured CB in the transport block data according to the puncturing indication information when decoding the transport block data, that is, the base station considers that the ACK is the second case described above. Otherwise, it is considered that the UE does not receive the puncturing indication information or does not have enough time to decode the puncturing indication information, and the UE decodes the entire transmission block data, that is, the punctured CB is also correctly decoded.
  • the base station determines that the ACK of the UE is The first case in the above embodiment. Of course, if the base station does not send the puncturing indication information, the base station considers the first case corresponding to the ACK fed back by the UE. It should be added that whether the terminal has enough time for decoding can be a specific value, which is related to the different processing capabilities of different terminals.
  • different resources configured for different situations include at least one of the following: different sequences, different codewords, different time-frequency resources.
  • the transport block data sent by the base station to the UE is punctured; or the base station Sending part or all of the sub-bands used by the transmission block data to the UE is a sub-band that allows puncturing transmission; or the base station configures the UE to monitor puncturing indication information; or the base station sends the UE to the UE
  • the transmitted transport block data is punctured and the base station configures the UE to monitor puncturing indication information; or the base station sends some or all sub-bands of the transport block data to the UE to allow punching transmission a sub-band, and the base station configures the UE to monitor the puncturing indication information; in the case that the base station determines, the base station determines, by the following manner, that the UE decodes: the base station and the UE pre-arrange When the ACK is sent, the bit and/or the sequence for indicating the situation is simultaneously sent; or the base station
  • the UE may use a preset resource feedback ACK corresponding to the foregoing scenario to indicate to the base station the situation or background in which the ACK is sent. That is, when the UE is in one of the above five situations, when the UE feeds back the ACK, the UE transmits the bit and/or sequence for indicating the situation, and further indicates the status by the value of the bit or the agreed sequence; if the UE When not in the above five cases, when the UE feeds back the ACK, the bits and/or sequences for indicating the situation are not transmitted at the same time.
  • the transmitting, by the base station, the retransmission data to the UE according to the ACK includes: in determining that the UE successfully decodes all CB data including the punctured CB, The base station does not resend data to the UE; in the case of determining that the UE successfully decodes all CB data except the punctured CB, the base station resends the punctured to the UE CB.
  • the base station determines, according to the NACK, retransmission data retransmitted to the UE, the base station determining to retransmit all CB data to the UE.
  • the base station sends the retransmission data to the UE according to the ACK or the NACK, including: the base station sends the retransmission data by using the same downlink control information DCI format as the initial transmission, or The base station transmits the retransmission data using a DCI format agreed in advance with the UE.
  • the base station determines whether the CB is punctured by: the base station acquiring the CB is punctured.
  • the ratio of the amount of data to the total amount of data of the CB wherein, when it is determined that the ratio is greater than (or equal to) a preset threshold, determining that the CB is a punctured CB; determining that the ratio is less than or equal to ( Or less than the preset threshold, determining that the CB is not punctured; or, when the CB has punctured data, the base station determines that the CB is a punctured CB; When the CB does not have punctured data, the base station determines that the CB is not punctured.
  • a method for data retransmission is provided, which is applied to a base station side, and includes the following steps:
  • Step 1 The base station occurs at least one of the following: the transmission block TB data sent by the base station to the terminal UE is punctured; and the base station sends the transmission block data to the UE, part or all of the sub-bands are allowed to be punched. a subband of the transmission; the base station configuring the UE to monitor the puncturing indication information;
  • Step 2 after at least one of the situations occurs, the base station receives an ACK or a NACK fed back by the UE, where the base station determines that the UE is in the transport block when the base station receives an ACK. All CB data except the punctured CB is successfully decoded;
  • Step 3 The base station sends retransmission data to the UE according to the ACK or the NACK, where the base station determines whether the CB in the transport block data is punctured by: the base station acquiring the CB a ratio of the amount of data punched to the total amount of data of the CB, wherein, when it is determined that the ratio is greater than a preset threshold, determining that the CB is a punched CB; determining that the ratio is less than or equal to the When the threshold is preset, it is determined that the CB is not punctured.
  • a method for data retransmission is provided, which is applied to a terminal side, and includes the following steps:
  • the transport block data received by the UE is punctured, and the data of the transport block received by the UE is located in the sub-band portion or All are sub-bands that allow puncturing transmission; the UE is configured to monitor puncturing indication information;
  • Step 2 after at least one of the situations occurs, the UE forms a fed back ACK or NACK; wherein the UE forms the ACK to belong to: the UE is punched in the transport block except All CB data outside the CB is successfully decoded;
  • Step 3 The UE sends the ACK or NACK to the base station, where the UE determines, according to the puncturing indication information and resource allocation information sent by the base station, the amount of data punched in the punched CB. a ratio of a total amount of data of the CB, wherein, when it is determined that the ratio is greater than a preset threshold, determining that the CB is a punctured CB; and determining that the ratio is less than or equal to the preset threshold, determining the CB Not punched.
  • a method for data retransmission is provided, where the method is applied to a UE side, including:
  • the transport block data received by the UE is punctured, and the data of the transport block received by the UE is located in the sub-band portion or All are sub-bands that allow puncturing transmission; the UE is configured to monitor puncturing indication information;
  • Step 2 after at least one of the situations occurs, the UE forms a feedback ACK or NACK; wherein, the UE forms the ACK to belong to one of the following situations: in a first case, the UE pairs the All CB data including the punctured code block CB in the transport block data is successfully decoded; in the second case, the UE successfully succeeds all CB data except the punctured CB in the transport block data. Decoding; the UE sends the ACK or NACK to the base station. It should be added that the first case may include that the UE successfully decodes all CB data including the punctured code block in the transport block data, and/or the UE determines that the CRC check of the transport block TB decoding passes.
  • the method further includes: the UE receiving the puncturing indication information sent by the base station; The indication information determines the location of the punched CB.
  • the UE determines, by using the following manner, the case where the puncturing indication information is not received or the puncturing indication information is not received before the UE feeds back the ACK.
  • the decoding succeeds, the case in which the UE forms the ACK belongs to the first situation; in the case that the puncturing indication information is successfully decoded before the UE feeds back the ACK, the UE is formed.
  • the case in which the ACK belongs is the second case. It should be added that when the UE receives the puncturing indication information but does not have enough time to decode, and receives the puncturing indication information but the decoding fails, the ACK of the UE is also the first case.
  • the UE notifies the base station of the ACK of the eNB by at least one of: different resources configured in advance with the base station to be configured in different situations, wherein the UE uses the resource The ACK is fed back; and the base station pre-arranges that when the ACK is sent, bits and/or sequences for indicating the situation are simultaneously transmitted.
  • different resources configured for different situations include at least one of the following: different sequences, different codewords, different time-frequency resources.
  • the method further includes: in a process in which the UE receives, by the base station, the transmission block data, the following situation occurs: the UE receives a transmission of the transmission block data sent by the base station, and performs a punching transmission; or Receiving, by the UE, part or all of the sub-bands through which the base station transmits the transport block data is a sub-band that allows puncturing transmission; or the UE is configured by the base station to monitor puncturing indication information; or The UE receives the punctured transmission of the transport block data sent by the base station, and the UE is configured by the base station to monitor the puncturing indication information; or the UE receives the part of the base station that the transport block data passes or All subbands are subbands that allow perforation transmission, and the UE is configured by the base station to listen for puncturing indication information; in the case where the base station occurs, the base station determines, by the following manner, that the UE decoding belongs to: The base station and the UE pre-arrange
  • the UE receives the puncturing indication information sent by the base station, and the UE determines whether the CB is punctured by: Determining, by the UE, the ratio of the amount of data punched in the punched hole CB to the total data amount of the CB according to the punching indication information and the resource allocation information, where, when determining that the ratio is greater than a preset threshold, determining The CB is the punctured CB; when it is determined that the ratio is less than or equal to the preset threshold, determining that the CB is not punctured; or, when the CB has punctured data, the base station Determining that the CB is a punctured CB; the base station determines that the CB is not punctured when there is no punctured data in the CB.
  • a method for data retransmission includes the following steps:
  • Step 1 The base station receives the ACK or NACK fed back by the UE, and determines retransmitted data according to the ACK or NACK according to the agreed rule.
  • step two the data is retransmitted to the UE.
  • a method for data retransmission comprising the following steps:
  • Step 1 The terminal UE receives the transport block data, and forms an ACK or a NACK according to the agreed rule;
  • step two the ACK or NACK is sent.
  • a transport block (TB) based feedback mechanism is configured, when a TB for Service 1 (eg, eMBB service) is transmitted within a scheduling unit (eg, a slot), if a bursty timeliness service 2 needs to be transmitted at this time (eg, For the URL1 service, the service 1 is punctured (the specific punctured time-frequency resource information will be indicated to the UE of the service 1, and the indication information is called the puncturing indication information, which is sent after the puncturing. ), transporting traffic 2 in the punctured resource.
  • a TB for Service 1 eg, eMBB service
  • a scheduling unit eg, a slot
  • a bursty timeliness service 2 For the URL1 service, the service 1 is punctured (the specific punctured time-frequency resource information will be indicated to the UE of the service 1, and the indication information is called the puncturing indication information, which is sent after the puncturing. ), transporting traffic 2 in the punctured resource.
  • the UE of the service 1 then forms feedback information for the TB level according to the TB level HARQ-ACK, and then the base station performs TB retransmission according to the HARQ-ACK of the feedback of the UE of the service 1.
  • the base station performs TB retransmission according to the HARQ-ACK of the feedback of the UE of the service 1.
  • two OFDM symbols are suddenly punctured (assuming that all frequency domain resources occupied by the eMBB of the UE1 are removed in the frequency domain, and sometimes the frequency domain resources of the UE1 are exceeded.
  • the range for example, the frequency domain resources of the eMBBs of the multiple UEs are punctured, and then the UE1 receives the TB of the eMBB service for decoding.
  • the UE1 feeds back the NACK to the base station, and then the base station retransmits the TB.
  • TB When the CRC check of the TB passes, UE1 feeds back the ACK to the base station, and then the base station does not retransmit the TB, and it is considered that UE1 correctly receives the TB.
  • the efficiency of the TB-based feedback mechanism and retransmission mechanism is low because it is possible that the correctly decoded CB (or CBG) in the CB included in the TB is also retransmitted.
  • the UE is configured to perform HARQ-ACK feedback based on the TB.
  • the base station schedules the TB of the transmission service 1 (for example, eMBB) to the UE in a scheduling unit (for example, a slot), in which a sudden service 2 (for example, a URLLC service) needs to be transmitted, and the base station transmits a partial OFDM symbol in a slot.
  • Punch with some physical resource blocks. 3 is a schematic diagram of transmission block data in which punctured transmission occurs according to an embodiment of the present application. As shown in FIG. 3, in one time slot, eMBB is punctured at the time of transmission. The time domain + frequency domain resource of the punch location is used to transmit service 2.
  • the puncturing location may only occur in the time-frequency domain resource of the eMBB service of one UE, or may occur in the time-frequency domain resource of the eMBB service of multiple UEs.
  • the base station sends the transport block data to the terminal UE: the transport block TB data sent by the base station to the UE is punctured, and the base station sends the location to the UE.
  • Some or all of the sub-bands used for the transport block data are sub-bands that allow punctured transmission; the base station configures the UE to monitor puncturing indication information; and the transmission block data sent by the base station to the UE appears to be punctured And transmitting, by the base station, the UE to monitor puncturing indication information; part or all of the sub-bands used by the base station to send the transport block data to the UE are sub-bands that allow puncturing transmission, and the base station configuration The UE monitors the puncturing indication information.
  • the above condition or situation can be regarded as a trigger condition, but the trigger condition does not directly affect the method implementation of the following embodiments. That is to say, the methods in the following embodiments can exist independently, without depending on the above conditions, but have better benefits under the trigger condition. That is, if other conditions arise, the methods in the following embodiments can still be used.
  • the base station sends the puncturing indication information to the UE before the UE feeds back the HARQ-ACK of the TB.
  • the puncturing indication information describes that the resources in the slot are punctured, for example, by OFDM symbols and frequency domain information.
  • the UE can calculate which CBs in the TB are punctured according to the received puncturing indication information, combined with the modulation coding rules of the TB, the mapping rule of the TB, and the time-frequency domain resources allocated during the TB transmission.
  • the base station can also infer which of the TBs punched by each UE at the punching hole are specifically punched.
  • the UE For the punctured TB, if the UE correctly decodes all unpunctured CBs (the CRC of the unpunctured CBs passes, and/or the CRC of the TB passes), the UE will feed back the ACK to the base station. Otherwise, the UE feeds back NACK. At this time, if the CRC check of the TB level is not passed (ie, the TB is not correctly decoded), but as long as the unpunctured CBs are correctly decoded by the UE, the UE feeds back the ACK at this time.
  • the CB here can be replaced by the code block group CBG.
  • the CBG does not have a CRC. When the CRC of all CBs included in one CBG passes, the CBG is considered to be correctly decoded, otherwise the CBG is considered to be incorrectly decoded.
  • the base station After receiving the ACK fed back by the UE, the base station determines that the puncturing indication information has been sent before the ACK is fed back (and leaving the UE with sufficient decoding puncturing indication information before the feedback ACK), and the base station side considers that the UE feedbacks at this time.
  • the meaning of ACK is that the unpunctured CBs in the TB are correctly decoded.
  • the base station retransmits the punctured CB without retransmitting the entire TB.
  • the base station can use the same downlink control information (DCI) format as the initial transmission, so that the UE can detect the DCI; the base station can also use other DCI formats, but the other DCI formats are agreed, and can be triggered by the above event.
  • DCI downlink control information
  • the base station uses the other DCI format by default when the feedback and retransmission occurs, so that the UE can easily detect the DCI.
  • the base station After receiving the NACK fed back by the UE, the base station considers that there is also a CB that is not correctly decoded in the CBs that are not punctured at this time. At this time, the base station retransmits the entire TB. Note that for the NACK, the base station does not need to refer to whether the puncturing indication information is sent before the UE feeds back the NACK (of course, the base station may also refer to whether the puncturing indication information is sent before the UE feeds back the NACK, but the meaning is not significant, so it is not performed here. Mandatory constraints).
  • the general CB can be encoded and decoded to obtain the correct decoding result; if the CB is destroyed, more data is destroyed. In general, this CB will not be decoded correctly.
  • the CB in the TB does not perform time domain interleaving in the TB as in the LTE system.
  • a reasonable threshold or ratio is obtained by simulation, that is, the amount of data of the CB being punctured is less than (equal to) the threshold; or, the ratio of the amount of data punched by CB to the amount of data of the entire CB is less than If the preset ratio is considered to be still correctly decoded, then these CBs belong to the minor punch CB.
  • the UE is configured to perform HARQ-ACK feedback based on the TB.
  • the base station schedules the TB of the transport service 1 (e.g., eMBB) to the UE in a scheduling unit (e.g., slot slot).
  • the abrupt service 2 e.g., URLLC service
  • the base station transmits part of the OFDM symbol and part of the physics in the slot.
  • the resource block is punctured.
  • eMBB is punctured during transmission in one time slot.
  • the time domain + frequency domain resource of the punch location is used to transmit service 2.
  • the puncturing location may only occur in the time-frequency domain resource of the eMBB service of one UE, or may occur in the time-frequency domain resource of the eMBB service of multiple UEs.
  • the base station does not send the puncturing indication information to the UE before the UE feeds back the HARQ-ACK of the TB (or the base station sends a puncturing indication, but the UE does not have time to decode).
  • the punching indication information describes that the resources in the slot are punctured.
  • the UE For the punctured TB, if the UE correctly decodes all CBs (and/or the CRC check of the TB passes), the UE will feed back the ACK to the base station; otherwise, the UE feeds back the NACK.
  • the base station After receiving the ACK fed back by the UE, the base station determines that the puncturing indication information is not sent before the ACK and/or NACK is fed back (or has been sent but cannot decode the puncturing indication information in time before the UE feeds back the ACK), and the base station side considers The meaning of the ACK and/or NACK fed back by the UE at this time is: ACK is that the TB is correctly decoded, and NACK is that the TB is not correctly decoded.
  • the base station can use the same downlink control information (DCI) format as the initial transmission, so that the UE can detect the DCI; the base station can also use other DCI formats, but the other DCI formats are agreed, and can be triggered by the above event. After being used by the base station, the base station uses the other DCI format by default when the feedback and retransmission occurs, so that the UE can easily detect the DCI.
  • DCI downlink control information
  • the general CB can be encoded and decoded to obtain the correct decoding result; if the CB is destroyed, more data is destroyed. In general, this CB will not be decoded correctly.
  • the CB in the TB does not perform time domain interleaving in the TB as in the LTE system.
  • Embodiments A and A1 Based on the embodiments A and A1, the actual embodiment A and the embodiment A1 can also be used in combination. The following mainly describes the difference, and other contents can be combined with Embodiments A and A1.
  • the base station when the puncturing position in the time slot of the service 1 is relatively small, the base station considers that the puncturing position does not affect the decoding of the TB and/or CBs in the slot (ie, the slot is hit. The TB and/or CBs of the hole position can still be correctly decoded.
  • the base station can not send the puncturing indication information (before the UE feeds back the ACK and/or NACK, it can also be understood that the base station sends the puncturing indication information but the UE has limited processing capability.
  • the puncturing indication information is not decoded before the ACK and/or NACK is fed back.
  • the processing capability of the UE is reported, and the base station is aware.
  • the puncturing indication information is a common information, and after the slot is punctured, it may be The data affecting multiple UEs, but the processing capabilities of different UEs are different, that is, the slot in which the base station sends the puncturing indication information is determined, but the UEs with different processing capabilities before they feed back the ACK and/or NACK (per UE)
  • the slots for feeding back ACK and/or NACK are not necessarily the same), some can successfully decode the puncturing indication information, and some cannot successfully decode the puncturing indication information, and then the UE and the base station process according to Embodiment A1; if the base station considers the puncturing The location may cause the TB and/or CBs in the slot to not be correctly decoded (ie, the TB and/or CBs in the slot cannot be correctly decoded), and the base station can send the puncturing indication information before the UE feeds back the ACK and/or NACK. (This means that the base station transmits the puncturing indication information and
  • the location of the puncturing indication information is generally two (discussing which one is not used), the first is that the puncturing indication information is sent at the end of one time slot, and the second is that the puncturing indication information is The start of a slot is sent. If it is the second type, the UE with strong processing capability can decode the puncturing indication information before feeding back the ACK and/or NACK in the slot, and the UE with weak processing capability may need at least one time slot duration to decode the puncturing indication information.
  • the puncturing indication information is a puncturing that is transmitted before the UE feeds back the ACK and/or NACK but the UE cannot decode before feeding back the ACK and/or NACK. Indicate the information.
  • puncturing occurs in slot n, but the UE feeds back ACK and/or NACK for data in slot n at the end of the slot n, at which time, if the second type is used, Obviously, the puncturing indication information can only be sent in the next time slot of the time slot n, and the UE cannot decode the puncturing indication information before feeding back the ACK and/or NACK.
  • the base station and the UE set the threshold values or ratios mentioned in the above embodiments A and A1. For example, a reasonable ratio K is obtained by simulation.
  • the ratio of the amount of data punched by one CB to the total amount of data of the CB is less than or equal to K, the base station and the UE consider that the CB can be correctly decoded by the codec gain; when a CB
  • the ratio of the amount of data to be punctured to the total amount of data of the CB is greater than K, the base station and the UE consider that the CB cannot be correctly decoded by the codec gain.
  • the base station can send the puncturing indication information (meaning that the base station considers the UE processing capability, so that the UE can decode the puncturing indication information in time before feeding back the ACK and/or NACK), and the base station and the UE according to the puncturing.
  • the indication information combined with the modulation coding rule of the TB, the mapping rule of the TB, and the time-frequency domain resource allocated during the TB transmission, the base station and the UE can estimate that those CBs in the TB are punctured, and the punched CB The amount of data that is destroyed accounts for the ratio of the entire CB.
  • the base station and the UE consider the CB to belong to the unpunctured CB; if the ratio is greater than K, the base station and the UE consider the CB to be The punctured CB, the base station and the UE can process the CB in accordance with the processed manner of the punctured CB in Embodiment A.
  • the ratio K it is possible that only one CB in a TB is punctured, and the ratio of the CB being punctured is less than k, so that the CB will be regarded as the unpunctured CB. And processing according to the unpunctured CB. If the UE correctly decodes the CB and other CBs (the TB is also correctly decoded), the UE will feed back the ACK; the UE does not correctly decode the CB but correctly decodes all other CBs. (But TB is not decoded correctly), at this time the UE feeds back NACK.
  • the base station side also determines, according to the ratio of the amount of data that the CB is destroyed in the TB, when determining whether the ACK and/or the NACK are received, determining the formation rule of the ACK and/or the NACK on the UE side (ie, determining the specificity of the UE side according to the ratio judgment)
  • the used ACK and/or NACK form a rule), and then the ACK and/or NACK meaning and subsequent retransmission processing are parsed. If an ACK is received, in this example, the entire TB is considered correct and no retransmission is needed. If a NACK is received, it is considered that there is a CB error in the entire TB, and the TB needs to be retransmitted.
  • an additional judgment condition ie, a threshold value or a ratio judgment according to the condition, and first determining the meaning of the ACK and/or NACK fed back by the UE according to the condition.
  • the extent to which a CB is punctured If the amount of data punched is relatively large, the CB belongs to the punched CB. If the number of punched holes is relatively small, the CB belongs to the unpunched CB.
  • the addition of the ratio condition is mainly to reduce the retransmission of the CB that is knocked out of a small amount of data, because these CB large probabilities can be correctly decoded by the codec gain.
  • the base station if the base station sends the puncturing indication information, the base station needs to determine, according to the processing capability of the UE and the time (or slot) of feeding back the ACK and/or the NACK, which of the ACK or NACK the UE feeds back is: Exclude the punched CB (if not specified in the text, consider whether to include the CB with a threshold or ratio of punches, can be agreed in advance), or not to remove the punched CB; UE is the same The UE should always try to receive the puncturing indication information and process it according to the punctured CB after receiving the puncturing indication information.
  • Embodiment A2 if puncturing occurs, but the base station does not transmit the puncturing indication information, it is apparent that the UE feedback ACK and/or NACK always includes the punctured CB.
  • Embodiment A2 even if the base station sends the puncturing indication information and leaves sufficient decoding time for the UE, the UE fails to decode the puncturing indication information. For example, in the current conclusion, the puncturing indication information will be transmitted through. A common group downlink control information (DCI) is transmitted. The general DCI transmission error rate is 1%. In the case of poor channel quality, the error rate will increase. This situation is also called DCI loss. Therefore, when the DCI loss occurs, the base station will misunderstand the meaning of the ACK and/or NACK fed back by the UE, for example, the base station sends the puncturing indication information.
  • DCI downlink control information
  • the UE does not correctly decode the puncturing indication information, and the UE still forms an ACK or NACK according to the CB that does not punctify the punctured, and the base station considers that the UE forms an ACK or NACK according to the punctured CB.
  • the base station considers that the UE forms an ACK or NACK according to the punctured CB.
  • misunderstanding will inevitably lead to additional retransmission problems.
  • Embodiment A3 In order to overcome the above problems, a mode is given in Embodiment A3.
  • the basic idea is to notify the base station by implicit or explicit indication when the UE feeds back the ACK or NACK.
  • the ACK or NACK of the feedback is in accordance with the CB (including case 1) containing the punched hole, or is not included. CB of the hole (denoted as case 2).
  • the base station side also receives the ACK/NACK fed back by the UE.
  • the base station determines, according to the implicit or explicitly indicated information, the belonging condition corresponding to the ACK is Case 1 or Case 2. Then, it is determined that the retransmitted data is retransmitted to the UE.
  • the base station considers that the TB is correctly decoded by the UE and does not need to retransmit; if the ACK corresponds to case 2, the base station considers that the TB needs to retransmit the punctured CB to the UE.
  • the punctured CB here is divided into two cases, and the base station and the UE need to define the definition in advance. The first one is CB that is punched as long as the CB is punched; the second is that the CB punched data exceeds the threshold, which is the punched CB.
  • NACK in case.
  • the base station and the UE agree to allocate different resources for forming a feedback ACK or NACK in different situations.
  • Different resources include different sequences, different codewords, and at least one of the three dimensions of different time-frequency resources are different, and can be distinguished as long as one dimension is different.
  • the eNB forms an ACK or a NACK according to different conditions of the configuration of the base station, the eNB transmits the ACK or the NACK, which is fed back by the UE, in the corresponding resource, and determines the manner in which the UE forms an ACK or a NACK according to the detection result.
  • the impact on the subsequent retransmission is relatively large, so in the selection 1, only different resources can be allocated only for the ACK. For example, assign a different sequence for the two cases, the same codeword at the same time-frequency resource (if the codeword is supported).
  • the base station configures the UE or the base station to agree with the UE.
  • the UE forms a feedback ACK using sequence 1
  • the UE forms a feedback ACK usage sequence 2.
  • Cases 1 and 2 use the same time-frequency domain resources, assuming that codeword resources are not supported. In this way, the base station detects that the ACK that the sequence 1 considers to be fed back corresponds to the case 1 according to the agreement, and if the ACK corresponding to the sequence 2 is deemed to correspond to the case 2.
  • the base station considers that the TB is correctly decoded by the UE and does not need to retransmit; if the ACK corresponds to case 2, the base station considers that the TB needs to retransmit the punctured CB to the UE.
  • the base station and the UE agree that when the UE sends an ACK or a NACK, the bits and/or sequences indicating the ACK or NACK formation mode are simultaneously transmitted. For example, when the UE feeds back an ACK or a NACK, the UE adds one bit at the same time. This added one bit is used to describe whether the UE includes the punctured CB when the ACK or NACK is formed (ie, Case 1 or Case 2).
  • the base station and the UE default to if the UE is scheduled to work in the subband that allows the punctured transmission, or when the eNB punctured the TB transmitted by the UE, or the base station configures the UE to monitor the puncturing indication.
  • the UE feeds back an ACK or a NACK that always carries the 1-bit information.
  • the 1 bit can also be represented by a sequence.
  • the original ACK or NACK is a sequence.
  • another sequence is additionally sent to indicate that ACK and/or NACK are formed.
  • the base station configures whether the UE forms a punctured CB when forming a fed back ACK or NACK. That is, the base station notifies the UE by signaling whether the ACK/NACK includes the punctured CB when the ACK/NACK is formed, that is, whether the ACK/NACK is formed according to the case 1 or the case 2.
  • Table 1 is a summary table of various HARQ-ACK cases according to the specific embodiment A4. As shown in Table 1, when the punching indication information is not always transmitted, that is, the base station selects the sending punching indication information, the table 1 gives The meaning of various HARQ-ACKs has emerged.
  • Table 1 Summary of various HARQ-ACK scenarios
  • the UE is configured to listen for puncturing indication information, but the UE may fail to decode after receiving it, or miss the reception or there is not enough time to decode the puncturing indication information before feeding back the HARQ-ACK.
  • the base station determines whether there is a severely punctured CB for a UE's TB.
  • the base station and the UE can send an ACK/NACK according to the situation in the table, and the base station determines whether the ACK fed back by the UE is ACK1 according to whether the puncturing indication information is sent, whether the UE is configured to monitor the puncturing indication information, and whether there is a serious puncturing CB.
  • Still ACK2 determines whether the ACK fed back by the UE is ACK1 according to whether the puncturing indication information is sent, whether the UE is configured to monitor the puncturing indication information, and whether there is a serious puncturing CB.
  • the base station when the UE feeds back the ACK, if the base station sends the puncturing indication information, the UE is configured to monitor the puncturing indication information, and the CB that is punctured in the TB of the UE is slight (not exceeding the set threshold value) The base station considers that the ACK at this time is ACK2. For example, when the UE feeds back the ACK, if the base station does not send the puncturing indication information, and the CB that is punctured in the TB of the UE is slight, the base station considers that the ACK at this time is ACK2.
  • the base station when the UE feeds back the ACK, if the base station sends the puncturing indication information, the UE is configured to monitor the puncturing indication information, and the CB that is punctured in the TB of the UE is severe (above the set threshold value), the base station It is considered that the ACK at this time is ACK1. For example, if the UE feeds back the ACK, the base station sends the puncturing indication information, but the UE does not configure the pinging indication information, and the ACK fed back by the UE is ACK2. In the judgment condition in the above embodiment, the CB that is punctured in the TB of the UE is severe or slight may not be a judgment condition.
  • the base station determines whether the ACK that the UE feeds back is ACK1 or ACK2 according to whether the UE is configured to monitor the puncturing indication information, whether there is a serious puncturing CB. For example, when the UE feeds back the ACK, if the ping punch indication information is configured for the UE, and the punctured CB in the TB is slight (not exceeding the set threshold value), the base station considers that the ACK at this time is ACK2.
  • the base station when the UE feeds back the ACK, if the ping punch indication information is configured for the UE, and the punctured CB in the TB is severe (beyond the set threshold value), the base station considers that the ACK at this time is ACK1. For example, when the UE feeds back the ACK, if the monitoring puncturing indication information is not configured for the UE, the ACK fed back by the UE is ACK2. In the judgment condition in the above embodiment, the CB that is punctured in the TB of the UE is severe or slight may not be a judgment condition.
  • the situation is used to indicate a phenomenon that occurs when the base station sends the transmission block data to the terminal, and the scenario is referred to as a background; the situation is used to indicate the information A fed back by the terminal (in other embodiments, the information A is identified.
  • the terminal indicated by ACK is decoded, for example, whether the entire transport block including the punctured CB is successfully decoded.
  • the information A is identified as NACK, the corresponding information A indicates the situation in which the terminal decodes.
  • the situation A (here, the identification information A is identified as ACK, and here is the case A)
  • the UE decodes at least one CB data in the unpunctured CB in the received transport block data (whether or not the punctured CB is correctly decoded), and the transport block decoding error; or The UE does not correctly receive the puncturing indication information (including the UE decoding error, the missed receiving and the non-receiving puncturing indication information), the transmission block decoding error, and the case B (here, the identification information A is identified as ACK, here is the case B) Yes, the UE successfully decodes all CB data except the punctured CB in the received transport block data, the punctured CB is not successfully decoded, and the transport block (the CRC check fails) decoding error.
  • the base station retransmits the entire TB.
  • the base station retransmits the punctured CB (eliminating the retransmission of the unpunctured CB).
  • the information A is identified as NACK, it shares the situation when the information A is identified as ACK (5 cases). It shares the method used to distinguish the case A or the case B when the information A is identified as ACK. In the case of no conflict, it can share or combine all the methods when the information A is identified as an ACK.
  • the base station when the UE feeds back the NACK, the base station is notified by implicit or explicit indication, whether the NACK of the current feedback is formed according to the case A or the case B.
  • the base station side also receives the NACK fed back by the UE.
  • the base station determines, according to the implicit or explicitly indicated information, that the corresponding situation of the NACK is Case A or Case B. Then, it is determined that the retransmitted data is retransmitted to the UE. If the NACK corresponds to case A, the base station retransmits the TB; if the NACK corresponds to case B, the base station considers that the TB needs to retransmit the punctured CB to the UE.
  • the punctured CB here is divided into two cases, and the base station and the UE need to define the definition in advance.
  • the first one is CB that is punched as long as the CB is punched; the second is that the CB punched data exceeds the threshold (as defined in the foregoing embodiment), which is the punched CB.
  • the base station and the UE agree to allocate different resources for forming a feedback ACK or NACK in different situations.
  • Different resources include different sequences, different codewords, and at least one of the three dimensions of different time-frequency resources are different, and can be distinguished as long as one dimension is different.
  • the eNB forms an ACK or a NACK according to different conditions of the configuration of the base station, the eNB transmits the ACK or the NACK, which is fed back by the UE, in the corresponding resource, and determines the manner in which the UE forms an ACK or a NACK according to the detection result.
  • the impact on the subsequent retransmission is relatively large, so in the selection 1, only different resources can be allocated only for the ACK. For example, assign a different sequence for the two cases, the same codeword at the same time-frequency resource (if the codeword is supported).
  • the base station configures the UE or the base station to agree with the UE.
  • the UE forms a feedback NACK using sequence 1
  • the UE forms a feedback NACK usage sequence 2.
  • Cases A and B use the same time-frequency domain resources, assuming that codeword resources are not supported. In this way, the base station detects that the NACK corresponding to the sequence 1 considers feedback A according to the agreement, and if the sequence 2 considers that the NACK of the feedback corresponds to the case B. If the NACK corresponds to Case A, the base station considers that the TB is not correctly decoded by the UE and needs to retransmit the TB. If the NACK corresponds to Case 2, the base station considers that the TB needs to retransmit the punctured CB to the UE.
  • the base station and the UE agree that when the above situation occurs, when the UE sends an ACK or a NACK, the bits and/or sequences indicating the ACK or NACK formation mode are simultaneously transmitted. For example, when the UE feeds back an ACK or a NACK, the UE adds one bit at the same time. The added one bit bit value is used to describe whether the UE includes the punctured CB when the ACK or NACK is formed (ie, Case A or Case B).
  • the base station and the UE default to if the UE is scheduled to work in the subband that allows the punctured transmission, or when the eNB punctured the TB transmitted by the UE, or the base station configures the UE to monitor the puncturing indication.
  • the UE feeds back the ACK or NACK and always carries the 1-bit information.
  • This one bit can also be represented by a sequence.
  • the original ACK or NACK is a sequence.
  • another sequence is additionally sent to indicate that ACK and/or NACK are formed.
  • the base station configures whether the UE forms a punctured CB when forming a fed back ACK or NACK. That is, the base station notifies the UE by signaling whether the ACK/NACK includes the punctured CB when the UE forms an ACK/NACK, that is, whether the ACK/NACK is formed according to the case A or the case B.
  • the ACK is divided into two types.
  • the UE in the present application successfully decodes all CB data except the punctured CB in the transport block data, the UE.
  • the NACK may also be sent to the base station, and the NACK meaning at this time is recorded as follows: the UE successfully decodes all CB data except the punctured CB in the transport block data.
  • the NACK at this time can be written as NACK1, which is essentially a NACK formed differently from other cases (for example, a NACK formed when a CB that is not punctured by the UE also has a CB that is not correctly decoded).
  • the UE when the UE successfully decodes all CB data except the punctured CB in the transport block data, the UE feeds back an ACK or a NACK as long as the ACK or NACK representation at this time is essential.
  • the meaning is that the UE successfully decodes all CB data except the punctured CB in the transport block data.
  • the essence of the present application is to distinguish the above two cases, regardless of the second case (the UE successfully decodes all CB data except the punctured CB in the transport block data) (It can also be marked as ACK, and it can be marked as NACK, as long as it is agreed in advance, this article is marked with ACK as an example.)
  • the description is essentially to distinguish between two cases: the UE has the above mentioned in the transport block data. All CB data except the punctured CB is successfully decoded and the UE successfully decodes all CB data including the punctured code block CB in the transport block data.
  • the UE is configured to perform HARQ-ACK feedback based on the TB.
  • the base station schedules the TB of the transmission service 1 (for example, eMBB) to the UE in a scheduling unit (for example, a slot).
  • the abrupt service 2 for example, the URLLC service
  • the base station transmits part of the OFDM symbol and part of the physical resource in the slot.
  • the block is punched.
  • eMBB is punctured during transmission in a slot.
  • the time domain + frequency domain resource of the punch location is used to transmit service 2.
  • the puncturing location may only occur in the time-frequency domain resource of the eMBB service of one UE, or may occur in the time-frequency domain resource of the eMBB service of multiple UEs.
  • the base station sends the puncturing indication information to the UE before the UE feeds back the HARQ-ACK of the TB (or when the base station and the UE stipulate the five situations mentioned above).
  • the puncturing indication information describes that the resources in the slot are punctured, for example, by OFDM symbols and frequency domain information.
  • the UE Based on the received puncturing indication information, the UE combines the modulation coding rules of the TB, the mapping rules of the TB, and the time-frequency domain resources allocated during the TB transmission, and the UE can calculate that the CBs in the TB are punctured.
  • the base station can also infer that the specific CBs in the TB that are punched by each UE at the puncturing are punctured.
  • the base station and the UE agree that if a CB is punctured in one TB, when the UE feeds back the ACK and/or NACK of the TB, it feeds back according to the CBG level ACK and/or NACK.
  • the CBG format is previously configured to the UE.
  • the division of CB to CBG in TB can refer to the prior art.
  • the base station and the UE determine the corresponding retransmission process according to the ACK and/or NACK feedback of the CBG level (for example, refer to the CBG-based retransmission mechanism in the related art before the application date of the present application).
  • threshold values or ratios may also be introduced in the above embodiments, and the definitions and usages are similar to those in Embodiment A2.
  • the ratio of the CB being punctured is less than or equal to the threshold or the ratio, the base station and the UE consider the CB to belong to the unpunctured CB. If the ratio of the CB being punctured is greater than the threshold or the ratio, the base station and the UE consider the CB to belong to the punctured CB.
  • the processing after the threshold value or the ratio is increased is described in Reference Embodiment A2.
  • the base station can use the same downlink control information (DCI) format as the initial transmission to facilitate the UE to detect the DCI; or the base station can also use other DCI formats (for example, the DCI format with the CBG indication), but The other DCI format is agreed. It can be used by the base station after being triggered by the above event. That is, when the feedback and retransmission occur, the base station uses the other DCI format by default, so that the UE can easily detect the DCI.
  • DCI downlink control information
  • the CBG mechanism can also be applied to the CB level, and the specific processing is the same. It can be considered that the operation of CBG and the operation of CB are essentially the same, and can be interchanged, only the difference in granularity corresponding to CB and CBG.
  • the puncturing event occurs as a trigger condition (may also be that the base station and the UE agree to the five scenarios mentioned above as trigger conditions), and the CBG-level HARQ-ACK feedback mechanism is automatically triggered when the puncturing occurs, although the addition is made.
  • the UE feeds back the overhead of the information, but can reduce the amount of retransmitted data.
  • the correctly decoded CBG or CB will not be retransmitted, especially if the unpunctured CBs (or CBGs) are not correctly decoded.
  • CB (or CBG) in this case, can only retransmit such CBs (or CBGs).
  • the UE feeds back the NACK, and the base station retransmits the entire TB.
  • the feedback is performed according to the CBG level HARQ-ACK, it can be identified that those CBs (or CBGs) in the TB are not. Correct decoding, so only CBs (or CBGs) that are not correctly decoded can be retransmitted.
  • the UE is configured to perform HARQ-ACK feedback based on the TB.
  • the base station schedules the TB of the transmission service 1 (for example, eMBB) to the UE in a scheduling unit (for example, a slot).
  • the abrupt service 2 for example, the URLLC service
  • the base station transmits part of the OFDM symbol and part of the physical resource in the slot.
  • the block is punched.
  • eMBB is punctured during transmission in a slot.
  • the time domain + frequency domain resource of the punch location is used to transmit service 2.
  • the puncturing location may only occur in the time-frequency domain resource of the eMBB service of one UE, or may occur in the time-frequency domain resource of the eMBB service of multiple UEs.
  • the base station retransmits the punctured CB (or CBG) for the UE before the UE feeds back the HARQ-ACK of the TB, and uses the DCI format with CB (or CBG) indication (which can indicate the CB in the TB) Or CBG is transmitted), using the same process number as when transmitting TB.
  • the base station and the UE consider this retransmission to be a retransmission of the punctured data.
  • the UE receives the retransmitted data and replaces the previously received data of the punctured position with the received retransmission data according to the CB (CBG) indication.
  • the TB is then decoded and fed back to the TB level or CBG level HARQ-ACK.
  • the base station After the base station sends the puncturing indication information, the base station retransmits the punctured CB (or CBG) for the UE, and uses the same DCI format as the initial transmission, and uses the TB transmission time. The same process number.
  • the base station and the UE consider this retransmission to be a retransmission of the punctured data.
  • the UE receives the retransmitted data, and estimates the punctured CB (CBG) according to the puncturing indication information, and replaces the previously received punctured position data with the received retransmission data.
  • the TB is then decoded and fed back to the TB level or CBG level HARQ-ACK.
  • threshold values or ratios may also be introduced in the above embodiments, and the definitions and usages are similar to those in Embodiment A2.
  • the ratio of the CB being punctured is less than or equal to the threshold or the ratio, the base station and the UE consider the CB to belong to the unpunctured CB. If the ratio of the CB being punctured is greater than the threshold or the ratio, the base station and the UE consider the CB to belong to the punctured CB.
  • the processing after the threshold value or the ratio is increased is described in Reference Embodiment A2.
  • the CBG mechanism can also be applied to the CB level, and the specific processing is the same. It can be considered that the operation of CBG and the operation of CB are essentially the same, and can be interchanged, only the difference in granularity corresponding to CB and CBG.
  • the UE is configured to perform HARQ-ACK feedback based on the TB.
  • the base station schedules the TB of the transmission service 1 (for example, eMBB) to the UE in a scheduling unit (for example, a slot).
  • the abrupt service 2 for example, the URLLC service
  • the base station transmits part of the OFDM symbol and part of the physical resource in the slot.
  • the block is punched.
  • eMBB is punctured during transmission in a slot.
  • the time domain + frequency domain resource of the punch location is used to transmit service 2.
  • the puncturing location may only occur in the time-frequency domain resource of the eMBB service of one UE, or may occur in the time-frequency domain resource of the eMBB service of multiple UEs.
  • the base station and the UE agree that if the base station retransmits the TB, the base station uses the DCI format with the CBG indication.
  • the puncturing + UE feedback NACK is used as a condition, and the base station is triggered to retransmit using the DCI format including the CBG indication when retransmitting the TB, so that the UE performs DCI detection.
  • the UE may be in the TB level or the CBG level.
  • the CBG mechanism can also be applied to the CB level, and the specific processing is the same. It can be considered that the operation of CBG and the operation of CB are essentially the same, and can be interchanged, only the difference in granularity corresponding to CB and CBG.
  • the UE is configured to perform HARQ-ACK feedback based on the TB. For a data transmission, if the UE feeds back the NACK of the TB level, when the base station retransmits the TB, the behavior of the base station and the UE:
  • the base station and the UE agree that if the base station retransmits the TB, the base station uses the DCI format with the CBG indication.
  • the UE mainly feeds back the NACK of the TB level as a condition, and triggers the base station to perform retransmission using the DCI format including the CBG indication when retransmitting the TB, so that the UE performs DCI detection.
  • the UE When the UE feeds back HARQ-ACK for this retransmission (ie, two or more feedbacks), it may be in the TB level or the CBG level.
  • the CBG mechanism can also be applied to the CB level, and the specific processing is the same. It can be considered that the operation of CBG and the operation of CB are essentially the same, and can be interchanged, only the difference in granularity corresponding to CB and CBG.
  • the technical solution of the present application which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM and/or RAM, magnetic
  • a storage medium such as ROM and/or RAM, magnetic
  • the disc, the optical disc includes a plurality of instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method described in the various embodiments of the present application.
  • the behavior of the base station and the UE is:
  • the base station considers that the ACK or NACK fed back by the UE is formed as follows:
  • the UE feeds back the results of the two parts to the base station at the same time, and the base station determines, according to the feedback result of the UE, that part of the CB needs to be retransmitted, and then performs retransmission.
  • the UE receives the punching indication information:
  • the UE If the UE correctly decodes the puncturing indication information, the UE corresponds to an ACK or NACK for all unpunctured CBs (denoted as the first part), and if they are correctly decoded, an ACK is formed, otherwise a NACK is formed; for all punctured CBs (Remarked as the second part) Corresponding to an ACK or NACK, if both are correctly decoded, an ACK is formed, otherwise a NACK is formed; the UE feeds back the results of the two parts to the base station simultaneously.
  • the UE forms an ACK for both parts of the CB, and the CRC check of the transport block passes, two ACKs are sent; if the UE forms an ACK for both parts of the CB, but the transport block The CRC check fails, and the UE sends a NACK for the two parts of the CB.
  • the UE feeds back: if the CRC of the TB passes, the UE feeds back the ACK (in this case, it can be agreed to be 1 or 2). If the CRC check of the TB fails, the UE feeds back NACK (in this case, it can be agreed to be 1 or 2).
  • FIG. 4 is a hardware structural diagram of a base station according to an embodiment of the present application. As shown in FIG. 4, the base station 40 includes:
  • the first communication device 402 is configured to send the transport block data to the terminal UE, and receive the ACK and/or NACK fed back by the UE, wherein at least one of the following occurs in the process of transmitting the transport block data to the terminal UE:
  • the transmission block TB data sent by the base station to the UE is punctured;
  • the base station transmits to the UE, part or all of the sub-bands used by the transmission block data are sub-bands that allow puncturing transmission;
  • the base station Configuring the UE to monitor the punching indication information;
  • the first processor 404 is configured to: after determining that at least one of the situations occurs, determine, when the ACK is received, that the UE decoding belongs to one of the following: the UE is in the transport block data All CB data including the punctured code block CB is successfully decoded; the UE successfully decodes all CB data except the punctured CB in the transport block data; and, the first The processor 404 is further configured to send retransmission data to the UE by using the first communications device according to the ACK or the NACK.
  • the method embodiments that can be performed by the base station side can be performed by the base station 40 in this embodiment.
  • a base station comprising: a second communication device configured to send transport block data to a terminal UE, and receive an ACK and/or a NACK fed back by the UE, where the terminal UE At least one of the following occurs in the process of transmitting the transport block data: the transport block TB data sent by the base station to the UE is punctured; and the base station sends the transport block data to the UE.
  • all subbands are subbands that allow perforation transmission;
  • the base station configures the UE to listen for puncturing indication information; and the second processor is configured to receive the ACK after determining that at least one of the conditions occurs At the time, the UE successfully decodes all CB data except the punctured CB in the transport block; and the second processor is further configured to pass the first communication device according to the ACK or NACK.
  • the second processor determines whether the CB in the transport block data is punctured by: obtaining an amount of data of the CB punctured and the total data of the CB Ratio of matter , Upon determining that the ratio is greater than a predetermined threshold value, is determined as being the punctured CB CB; upon determining that the ratio is less than or equal to the preset threshold, determine that the CB is not punctured.
  • FIG. 5 is a hardware structural diagram of a terminal according to an embodiment of the present application. As shown in FIG. 5, the terminal 50 includes:
  • the third communication device 502 is configured to receive the transport block data sent by the base station; and to feed back the ACK and/or the NACK to the base station; wherein, in the process of receiving the transport block data, at least one of the following occurs: receiving The transport block data is punctured and transmitted; part or all of the subbands of the received transport block data are subbands that allow puncturing transmission; and the third processor 504 is configured to monitor puncturing indication information;
  • the third processor 504 is configured to form a feedback ACK or NACK after at least one of the occurrences of the situation; wherein, the case in which the ACK is formed is: in addition to the punched CB in the transport block All the CB data is successfully decoded; wherein the third processor determines, according to the puncturing indication information and the resource allocation information sent by the base station, the ratio of the amount of data punched in the punched CB to the total data amount of the CB, When it is determined that the ratio is greater than a preset threshold, determining that the CB is a punctured CB; and determining that the ratio is less than or equal to the preset threshold, determining that the CB is not punctured.
  • the terminal 50 may be the mobile terminal shown in FIG. 1 and also has the memory shown in FIG.
  • a terminal comprising: a fourth communication device configured to receive data transmitted by a base station, and to feed back ACK and/or NACK to the base station; wherein receiving the transmission In the process of block data, at least one of the following occurs: the received transport block data has a punctured transmission; some or all of the sub-bands of the received transport block data are sub-bands that allow punctured transmission; the fourth processor The fourth processor is configured to form a feedback ACK or NACK after the occurrence of the at least one of the situations, wherein the case in which the ACK belongs is formed as one of the following: The fourth processor successfully decodes all data including the punctured code block CB; in the second case, the fourth processor successfully decodes data other than the punctured CB.
  • a system for data retransmission including: a base station transmitting transport block data to a UE, wherein at least one of the following occurs in the process of transmitting the transport block data: the base station Punching transmission occurs in the transport block TB data transmitted to the UE; part or all of the sub-bands used by the base station to transmit the transport block data to the UE are sub-bands that allow punching transmission;
  • the UE monitors the puncturing indication information; the UE feeds back an ACK and/or a NACK, where the UE forms the ACK to belong to one of the following situations: in the first case, the UE includes the All CB data including the punctured code block CB is successfully decoded; in the second case, the UE successfully decodes all CB data except the punctured CB in the transport block data; the base station receives And the ACK and/or the NACK, wherein, when the base station receives the ACK, the base station determines, according to the
  • a processor configured to execute a program, wherein the program is executed while performing the method of any of the above alternative embodiments.
  • the processor can read the program from a storage medium and execute the program to implement the method provided by any of the foregoing implementations.
  • a storage medium comprising a stored program, wherein the program is executed while performing the method described in any of the above alternative embodiments.
  • the storage medium can be a non-transitory storage medium.
  • modules or steps of the present application can be implemented by a general computing device, which can be concentrated on a single computing device or distributed in a network composed of multiple computing devices.
  • they may be implemented by program code executable by a computing device such that they may be stored in a storage device for execution by the computing device and, in some cases, may differ from this
  • the steps shown or described are performed sequentially, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module.
  • the application is not limited to any particular combination of hardware and software.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

La présente invention concerne un procédé de retransmission de données, une station de base, un terminal, et un système. Le procédé de retransmission de données comprend les étapes suivantes : pendant qu'une station de base envoie des données de bloc de transport à un terminal, après que l'une de situations prédéterminées associées à une transmission discontinue s'est produite, la station de base reçoit l'ACK ou le NACK retourné par l'UE ; lorsque la station de base reçoit l'ACK, elle détermine, sur la base de l'ACK, si le décodage d'un UE appartient au premier cas ou au second cas ; et, d'une manière correspondant au premier cas ou au second cas, elle détermine s'il faut ou non retransmettre les données, et elle envoie les données retransmises.
PCT/CN2018/097788 2017-08-11 2018-07-31 Procédé de retransmission de données, station de base, terminal, et système WO2019029399A1 (fr)

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EP4171149A4 (fr) * 2020-07-17 2023-08-30 Huawei Technologies Co., Ltd. Procédé et appareil de transmission de données
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