WO2018137584A1 - Procédé, dispositif, et système de rétroaction - Google Patents

Procédé, dispositif, et système de rétroaction Download PDF

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Publication number
WO2018137584A1
WO2018137584A1 PCT/CN2018/073654 CN2018073654W WO2018137584A1 WO 2018137584 A1 WO2018137584 A1 WO 2018137584A1 CN 2018073654 W CN2018073654 W CN 2018073654W WO 2018137584 A1 WO2018137584 A1 WO 2018137584A1
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WIPO (PCT)
Prior art keywords
feedback information
bits
code block
transmission time
time unit
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PCT/CN2018/073654
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English (en)
Chinese (zh)
Inventor
彭金磷
董朋朋
唐浩
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from CN201710409456.7A external-priority patent/CN108365922B/zh
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP18744155.5A priority Critical patent/EP3550752B1/fr
Priority to JP2019540436A priority patent/JP6837564B2/ja
Publication of WO2018137584A1 publication Critical patent/WO2018137584A1/fr
Priority to US16/516,307 priority patent/US20190342053A1/en

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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

Definitions

  • the present application relates to wireless communication technologies, and in particular, to a communication method, device, and system related to whether feedback data is correctly received.
  • the transmitted data may correspond to a transport block (TB) at the physical layer, and the TB plus a cyclic redundancy check (CRC) for the receiving end to check whether the TB is successfully received.
  • TB transport block
  • CRC cyclic redundancy check
  • the TB can be divided into a number of code blocks (CBs), and the transmitting end further adds a corresponding CRC to each CB for the receiving end to check whether each CB is successfully received.
  • CBs code blocks
  • ACK 1-ack acknowledgement
  • NACK negative acknowledgement
  • the feedback overhead is bound to increase sharply.
  • the present application describes a method, apparatus and system for feedback in a communication system.
  • an embodiment of the present application provides a method for feedback in a communication system, the method comprising:
  • the first device sends data to the second device; the first device receives the data sent by the second device; and the first device sends, to the second device, feedback information about whether the data is successfully received,
  • the number of bits of the feedback information is associated with the size of the transmission time unit in the communication system; the second device receives the feedback information.
  • the number of bits of the feedback information is determined according to the size of the transmission time unit, which flexibly realizes a tradeoff between transmission efficiency and feedback overhead in the communication system, and improves the performance of the entire communication system.
  • the size of the transmission time unit is determined by at least one of the following parameters: a subcarrier spacing of the communication system and a number of time domain symbols of the transmission time unit.
  • the number of bits of the feedback information is related to the size of the transmission time unit in the communication system, including: when the size of the transmission time unit is smaller than a first threshold, the feedback information The number of bits is one; or, when the size of the transmission time unit is greater than or equal to the first threshold, and the first device is not configured with the additional demodulation reference signal DRMS, the number of bits of the feedback information is one. Or when the size of the transmission time unit is greater than or equal to the first threshold, and the number of sub-bands to which the data is mapped is one or the number of sub-carriers is one, the number of bits of the feedback information is one. .
  • the channel fluctuation is not large for the data, or the influence of the channel on the data is basically the same. Therefore, using 1 bit for feedback can save system overhead.
  • the number of bits of the feedback information is related to the size of the transmission time unit in the communication system, including: when the size of the transmission time unit is greater than or equal to a first threshold, the feedback The number of bits of the information is multiple; or when the size of the transmission time unit is greater than or equal to the first threshold, and the first device is configured with an additional DRMS, the number of bits of the feedback information is multiple; or, when When the size of the transmission time unit is greater than or equal to the first threshold, and the number of sub-bands to which the data is mapped is greater than one, or the number of sub-carriers is greater than one, the number of bits of the feedback information is multiple; or, when The size of the transmission time unit is greater than or equal to a first threshold, when the first device is configured with an additional demodulation reference signal DRMS, and the number of sub-bands to which the data is mapped is greater than one or when the number of sub-carriers is greater than one The number of bits of the feedback information is multiple.
  • the channel fluctuation is large, or the influence of the channel quality received by different segments of the data is likely to be different, so multiple bits can be used for feedback, so that the second The device only needs to retransmit the data part that the first device feeds back to the data that is not correctly received, and does not need to repeat the portion of the legend data that is correctly received.
  • an embodiment of the present application provides a method for feedback, including: a second device sends L transport blocks to a first device, where L is an integer greater than or equal to 1; Transmitting, by the first device, the L transport blocks, where the first device sends the feedback information of the L transport blocks to the second device, where the number of bits of the feedback information is related to the parameter of the control message .
  • the second device receives the feedback information.
  • the number of bits of the feedback information is determined according to the parameters of the control message, and the tradeoff between the transmission efficiency and the feedback overhead in the communication system is flexibly realized, and the performance of the entire communication system is improved.
  • the parameter of the control message is a codebook size of the feedback information
  • Ni is a number of original feedback bits corresponding to an i-th transport block in the L transport blocks, where i is 1
  • the number of bits of the feedback information is L, and the number of feedback bits corresponding to the L transport blocks is one; or
  • the number of bits of the feedback information is One.
  • the parameter of the control message is a capacity of the control message
  • the control message includes the feedback information and other information sent by the first device to the second device, Ni a number of original feedback bits of the i-th transport block in the L transport blocks, where i is an integer of 1 ⁇ i ⁇ L, the Ni is an integer greater than or equal to 1, and the bits occupied by the other information
  • the number is K, K is a positive integer; More than the capacity of the control message, the number of bits of the feedback information is L, and the number of feedback bits corresponding to the L transport blocks is one; or, when Less than or equal to the capacity of the control message, the number of bits of the feedback information is One.
  • the parameter of the control message is a channel that carries the control message; when the control message is carried on a short physical uplink control channel, the short PUCCH, the number of bits of the feedback information is L.
  • the number of feedback bits corresponding to the L transport blocks is one; or, when the control message is carried on the long physical uplink control channel long PUCCH or the physical uplink shared channel PUSCH, the number of bits of the feedback information,
  • the number of feedback bits corresponding to each of the L transport blocks is at least one.
  • the above design all needs to determine the number of bits of the feedback information on the premise of satisfying the requirements of the communication system, and prevent communication errors in the system communication process because the system requirements are not met.
  • an embodiment of the present application provides a method for feedback in a communication system, the method comprising:
  • the second device sends at least one code block to the first device; the first device receives at least one code block sent by the second device; the first device sends the at least one code to the second device
  • the number of bits of the feedback information is determined according to whether the partial data corresponding to the at least one code block is affected, and the tradeoff between the transmission efficiency and the feedback overhead in the communication system is flexibly realized, and the performance of the entire communication system is improved.
  • the number of bits of the feedback information is multiple.
  • the at least one code block is a plurality of code blocks
  • the number of bits of the feedback information is multiple, including: the number of bits of the feedback information is multiple, wherein at least one bit And indicating that the unaffected code blocks in the plurality of code blocks are successfully received, and at least one bit is used to indicate whether the affected code blocks in the plurality of code blocks are successfully received.
  • the at least one code block is a code block, and the number of bits of the feedback information is multiple, and the feedback information is used to indicate the reception quality of the one code block.
  • the at least one code block is a plurality of code blocks
  • the number of bits of the feedback information is associated with whether the partial data corresponding to the at least one code block is affected, including: when When part of the data corresponding to the plurality of code blocks is affected and the code rate of the plurality of code blocks is greater than the second threshold, the affected code blocks of the plurality of code blocks are not successfully received, and the feedback information occupies 1 a bit, the 1 bit is used to indicate whether an unaffected code block of the plurality of code blocks is successfully received. Because the code rate is high, the reception of the affected part of the data fails, so no additional feedback is needed.
  • the second device can be retransmitted immediately before the first device performs feedback or Retransmit the affected part of the data.
  • the at least one code block is a plurality of code blocks
  • the number of bits of the feedback information is associated with whether the partial data corresponding to the at least one code block is affected, including: when The part of the data corresponding to the plurality of code blocks is affected, and the first device receives the second device before the first device sends the feedback information corresponding to the at least one code block to the second device.
  • an embodiment of the present application provides a method for feedback in a communication system, the method comprising:
  • the first device sends data to the second device; the first device receives the data sent by the second device; the first device sends, to the second device, feedback information whether the data is successfully received,
  • the number of bits of the feedback information is associated with at least one of the parameters in the communication system; the second device receives the feedback information.
  • the parameters include: interval of subcarriers, number of time domain symbols of a transmission time unit, time domain Doppler parameters, DMRS configuration, number of subbands of the data transmission or number of carriers, whether there is burst interference or cooperation, handover
  • the mode the code rate of the data, whether to retransmit or retransmit before the transmission of the feedback information, and the TBS.
  • the feedback information is The number of bits may be one.
  • the first device is a medium-to-nearpoint user, or the first device is not limited in coverage, and the number of bits of the feedback information may be multiple.
  • the embodiment of the present invention provides an indication manner, including: receiving, by the first device, control information sent by the second device, where the control information includes indication information, where the indication information is used to indicate that the second device is
  • the transmission block TB sent by the first device adopts a CBG-level feedback mode or a TB-level feedback mode, and when the CBG-level feedback mode is adopted, the indication information is further used to indicate the sending of each code block group CBG included in the TB.
  • the first device uses 1 bit to feedback whether the TB is successfully received.
  • the first device sends according to each CBG. State, using at least 1 bit to feed back whether the TB is successfully received.
  • an embodiment of the present invention provides a first device, which has a function of implementing behavior of a first device in the design of the foregoing method.
  • the function may be implemented by hardware, and the structure of the first device includes a transceiver and a processor.
  • the corresponding software implementation can also be performed by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the modules can be software and/or hardware.
  • the first device may be a terminal.
  • the embodiment of the present invention provides a second device, which has the function of realizing the behavior of the second device in the actual method.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the second device may be a base station.
  • an embodiment of the present invention provides a communication system, where the system includes the first device and the second device.
  • an embodiment of the present invention provides a computer storage medium for storing computer software instructions for use in the first device, including a program designed to perform the above aspects.
  • an embodiment of the present invention provides a computer storage medium for storing computer software instructions for use in the second device, including a program designed to perform the above aspects.
  • FIG. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of a terminal according to an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of a base station according to an embodiment of the present application.
  • FIG. 4(b) is a diagram showing another relationship between time domain resources and channel fluctuations according to an embodiment of the present application.
  • FIG. 5 is an interaction flowchart of a method for feedback according to an embodiment of the present application.
  • FIG. 6(a) is a diagram showing another relationship between time domain resources and channel fluctuations according to an embodiment of the present application.
  • FIG. 6(b) is a diagram showing still another relationship between time domain resources and channel fluctuations according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • the physical layer provides a service for data transmission to the upper layer in a manner of a transmission channel.
  • the physical layer performs a series of channel coding related processing according to the specified format, including cyclic redundancy check (CRC) calculation, channel coding, code block interleaving and rate matching, After the code block is connected, mapped to the physical layer channel, etc., after the above processing, the data of the data transmitting end can be transmitted to the data receiving end.
  • CRC cyclic redundancy check
  • the processing flow related to the CRC calculation is: at the data sending end, the physical layer obtains data to be transmitted from a media access control (MAC) layer, and the data is called a transport block (TB).
  • the CRC is added to the TB for the data receiving end to check whether the TB is successfully received, and the TB is segmented according to the TB size (TBB). For example, if the TBS is greater than 6144 bits, the TB is divided into a plurality of code blocks (CBs), and the size of each CB is substantially the same and both are less than or equal to 6144, and then a corresponding CRC is added for each CB.
  • the data receiving end verifies whether each CB is successfully received.
  • the third section of the partnership project (3GPP) technical specification (TS) 36.212 version 14.1.1 (v14.1.1) section 5.1.2 on the way of code block segmentation has been specifically Description can be referred to.
  • the received data needs to be decoded, if all CB CRCs are corrected. If the CRC check succeeds and the CRC of the TB is successful, the acknowledgment response (ACK) of the 1-bit feedback is sent to the data sender to indicate that the data reception is successful; if there is a CRC check failure of the CB or the CRC check of the TB If the failure occurs, the negative acknowledgement (NACK) of the 1-bit bit is sent to the data sender to indicate that the data reception fails. At this time, the data sender needs to retransmit the entire TB. The ACK or the NACK may be carried in the control information sent by the data receiving end to the data sending end.
  • HARQ hybrid automatic repeat request
  • a certain TB is divided into 10 CBs, and only one CB is not successfully received by the data receiving end.
  • the data transmitting end retransmits all 10 CB data, and the retransmission of the other 9 CBs is apparent. It is unnecessary.
  • the fifth generation 5G also known as the new radio (NR) communication system
  • this phenomenon will be more serious.
  • NR will adopt a larger transmission bandwidth and adopt more antennas.
  • Ports, as well as slot slot aggregation transmission, etc. provide support for TBS increase in the frequency domain, airspace, and time domain respectively. Therefore, there will be a larger TBS in the future, and the number of CBs divided by one TB will be more. As the number of CBs increases, communication efficiency will be lower if feedback is still followed by the HARQ mechanism in LTE.
  • ultra-reliable low latency communication (URLLC) services and enhanced mobile bandwidth communication In the scenario where the service is coexisting, in the process of data transmission in the eMBB service, only a few CBs may be affected by the URLLC service, that is, only a few CBs in one TB are not received by the data receiver. Success, at this time, if the feedback is still followed by the HARQ mechanism in LTE, the communication efficiency will also be low.
  • URLLC ultra-reliable low latency communication
  • enhanced mobile bandwidth communication In the scenario where the service is coexisting, in the process of data transmission in the eMBB service, only
  • the feedback information may indicate decoder state information (DSI), for example, DSI may be divided into ACK, NACK but close to correct reception or NACK and The decoding effect is extremely poor.
  • DSI decoder state information
  • the three different information contents can be indicated by different bit values respectively.
  • multiple bits are used to indicate how many CB decoding errors are in the current TB.
  • the feedback overhead is bound to increase sharply, and the coverage performance of the control channel carrying the feedback is also affected.
  • the present application provides a method for performing feedback, which is specifically applicable to whether the data that the data data receiving end feeds back to the data data sending end is correctly received, and the bits used for the feedback can be determined according to different situations. Thereby a balance of communication efficiency and feedback overhead in the communication system is achieved in a compromise.
  • the technology described in this application can be applied to an LTE system, or other wireless communication systems using various radio access technologies, for example, using code division multiple access (CDMA).
  • CDMA code division multiple access
  • FDMA Frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • the terminal involved in the present application may be a device that provides voice or data connectivity to a user, including a wired terminal and a wireless terminal.
  • the wireless terminal can be a handheld device with wireless connectivity, or other processing device connected to a wireless modem, and a mobile terminal that communicates with one or more core networks via a wireless access network.
  • the wireless terminal can be a mobile phone, a computer, a tablet, a personal digital assistant (PDA), a mobile internet device (MID), a wearable device, and an e-book reader. Wait.
  • the wireless terminal can also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device.
  • the wireless terminal can be a mobile station or an access point.
  • the aforementioned UE is a type of terminal and is a title in the LTE system.
  • the above-mentioned devices are collectively referred to as terminals.
  • the base station involved in the present application is a device deployed in a radio access network (RAN) to provide a wireless communication function for a terminal.
  • the base station may include various forms of macro base stations, micro base stations, relay stations, access point base station controllers, transmission and reception nodes (TRPs), and the like.
  • TRPs transmission and reception nodes
  • the specific name of the base station may be different.
  • an evolved NodeB eNB
  • gNB new radio node B
  • the terminal as described above may be used by the terminal 200 as shown in FIG. 2 for performing the method steps related to the terminal in the various embodiments involved in the present application.
  • the terminal 200 includes a processing unit 210 and a transceiver unit 220.
  • the base station as described above may be the base station 300 as shown in FIG. 3 for performing the method steps associated with the base station in the various embodiments involved in the present application.
  • the base station 300 includes a processing unit 310 and a transceiver unit 320.
  • the operations performed by the processing unit 210 or the transceiver unit 220 can be regarded as the operation of the terminal 200, and the operations performed by the processing unit 310 or the transceiver unit 320 can be regarded as the operation of the base station 300.
  • the processing unit 310 in the base station 300 can be implemented by a processor of the base station 300, and the transceiver unit 320 can be implemented by a transceiver in the base station 300; the processing unit 210 in the terminal 200 can be processed by a processor in the terminal 200.
  • the transceiver unit 220 can be implemented by a transceiver in the terminal 200.
  • the first device involved in the present application is a data receiving end, and the second device is a data transmitting end.
  • the first device may be a terminal, and the second device may be a base station. That is, the terminal receives the downlink data sent by the base station, and the data is successfully received to the base station.
  • the feedback may be carried in a physical uplink control channel (PUCCH) (or NR-PUCCH in the NR).
  • PUCCH physical uplink control channel
  • the first device may be a base station
  • the second device may be a terminal. That is, the base station receives the uplink data sent by the terminal, and the data is successfully received to the terminal.
  • the feedback may be carried in the physical downlink control channel (PDCCH).
  • PDCCH physical downlink control channel
  • the feedback information in the application may be used to indicate that the first device successfully receives the feedback information of the data sent by the second device.
  • the information may be feedback information of the HARQ feedback, and each bit may correspond to one. ACK, or a NACK.
  • the feedback information may further indicate the amount of data required for retransmission, or the feedback information may also indicate decoder state information (DSI), for example, DSI.
  • DSI decoder state information
  • the three different information contents can be divided into ACK, NACK but close to correct reception or NACK and the decoding effect is extremely poor at the time of reception, and they can each be indicated by different bit values.
  • the first device receives the data sent by the second device, and according to the HARQ mechanism, needs to send the feedback information to the second device whether the data is successfully received.
  • the purpose of the HARQ mechanism is to ensure the reliability of data transmission.
  • the longer the time domain resource corresponding to data transmission the greater the influence of channel quality fluctuations, and the higher the uncertainty of whether the data transmission is correct.
  • the time domain resources corresponding to the data transmission are relatively short, and in the range of the time domain resources, the degree of influence of the received channel is substantially the same, or is affected by a large impact at the same time, that is, The channel quality is poor, resulting in all the data transmission errors, or at the same time being affected by small, that is, the channel quality is good, and the data transmission is all correct.
  • one bit can be used to feedback whether the data is successfully received, that is, the number of bits of the feedback information is 1 bit.
  • the time domain resource corresponding to the data transmission is long, and in the range of the time domain resource, the degree of influence of the received channel may fluctuate greatly, and sometimes it is greatly affected, that is, the channel. Poor quality leads to all errors in the data transmission, sometimes small impact, ie good channel quality, and the data transmission is all correct.
  • the number of bits of the feedback information is related to the time domain resources of the data, and the scheduling and transmission of data in the communication system is generally based on a transmission time unit in the communication system, and the transmission time unit It may also be referred to as a minimum scheduling unit.
  • a transmission time unit in the communication system, it may be a transmission time interval (TTI), and the NR/5G system may also be a slot, a time domain symbol, or one or more time domain symbols.
  • the mini slot is composed of or composed of multiple slots or mini-slots.
  • the time domain symbol may be an orthogonal frequency division multiplexing (OFDM) symbol, or may be a single carrier frequency division multiple access (SC-FDMA) symbol.
  • OFDM orthogonal frequency division multiplexing
  • SC-FDMA single carrier frequency division multiple access
  • the number of bits of the feedback information may be associated with the size of the transmission time unit.
  • the present application provides a method for feedback, including the following steps:
  • the first device receives data sent by the second device.
  • the first device sends, to the second device, feedback information about whether the data is successfully received, and the number of bits of the feedback information is related to a size of a transmission time unit in the communication system.
  • a first condition may be set, and the number of bits of the feedback information is determined according to whether the transmission time unit satisfies the first condition.
  • a threshold may be set for the size of the transmission time unit. If the size of the transmission time unit is greater than or equal to the threshold, that is, the first condition is met, and the feedback is performed by using multiple bits. That is, the number of bits of the feedback information is multiple bits. If the size of the transmission time unit is less than the threshold, that is, the first condition is not satisfied, the feedback may be performed by using 1 bit, that is, the number of bits of the feedback information is 1 bit;
  • the feedback is performed using multiple bits. If the size of the transmission time unit is less than or equal to the threshold, that is, the first condition is not satisfied, the feedback may be performed using 1 bit.
  • the size of the transmission time unit may depend on the interval of subcarriers and the number of symbols of the time slot. For example, in the LTE system, the subcarrier spacing is 15 kilohertz (KHZ), the slot number of the slot is 14, and the corresponding TTI is 1 microsecond (ms).
  • KHZ kilohertz
  • ms microsecond
  • the carrier spacing is 60 kHz and the symbol number of the slot is 7.
  • it is also possible to transmit the data in a manner of slot aggregation that is, multiple transmission time units can be scheduled to transmit the data together, so that the length of the time domain resources occupied by the data will be lengthened.
  • the threshold may be determined by the second device according to actual conditions, and dynamically notified to the first device, or determined by the first device according to actual conditions. It may also be pre-agreed by the first device and the second device.
  • a specific value may be set.
  • the number of feedback bits corresponding to the value is the number of bits of the feedback information.
  • the following table 1-3 shows:
  • the data After determining the number of bits of the feedback information, combined with the error situation actually transmitted by the data, for example, when the number of bits of the feedback information is multiple bits, the data may be divided into multiple groups, and whether each group is correctly received for each group Each bit has a 1-bit corresponding to it. For example, when the bit is a "1" value, the corresponding group data is correctly received. When the bit is "0", the corresponding group data reception failure occurs.
  • the first device sends the feedback information to the second device.
  • the data received by the first device in this embodiment may be considered to correspond to 1 TB.
  • the size of the transmission time unit may depend on the interval of subcarriers and the number of time domain symbols of the transmission time unit. Therefore, different from the first embodiment, in the second embodiment, the number of bits of the feedback information may be associated with the interval of the subcarriers or with the number of time domain symbols of the transmission time unit.
  • the number of bits of the feedback information is associated with the interval of the subcarriers, and a threshold may be set for the interval of the subcarriers.
  • a threshold may be set for the interval of the subcarriers.
  • the subcarrier spacing is inversely proportional to the size of the transmission time unit, if the sub
  • the feedback may be performed by using 1 bit, that is, the number of bits of the feedback information is 1 bit; if the size of the subcarrier interval is less than or equal to the threshold, using multiple bits
  • the feedback that is, the number of bits of the feedback information is multiple bits.
  • the feedback may be performed using 1 bit; if the subcarrier spacing is less than the threshold, the feedback is performed using multiple bits.
  • the number of bits of the feedback information is associated with the number of time domain symbols of the transmission time unit, and a threshold may be set for the number of time domain symbols of the transmission time unit, as those skilled in the art may know that the transmission time unit
  • the number of time domain symbols is proportional to the size of the transmission time unit. If the number of time domain symbols of the transmission time unit is less than the threshold, the feedback may be performed using 1 bit, that is, the number of bits of the feedback information. It is 1 bit; if the number of time domain symbols of the transmission time unit is greater than or equal to the threshold, the feedback is performed using multiple bits, that is, the number of bits of the feedback information is multiple bits.
  • the feedback may be performed by using 1 bit; if the number of time domain symbols of the transmission time unit is greater than the threshold, multi-bit is used. The feedback is made.
  • a specific value may be set for the interval of the subcarrier, where the specific value corresponds to a feedback bit number.
  • Tables 4 and 5 below show two possible ways to do this:
  • a specific value may be set for the time domain symbol of the transmission time unit, the specific value corresponding to a feedback bit number.
  • Tables 5 and 6 below show two possible ways to do this:
  • the number of bits of the feedback information may be associated with the interval of the subcarriers and the number of symbols of the transmission unit.
  • the threshold 1 and the threshold 2 may be respectively set for the interval of the subcarrier and the number of symbols of the transmission unit, if the interval of the subcarrier is greater than or equal to the threshold 1, and the number of symbols of the transmission time unit is less than the threshold 2
  • the number of bits of the feedback information is 1 bit; if the interval of the subcarrier is less than the threshold 1, and the number of symbols of the transmission time unit is greater than or equal to the threshold 2, the number of bits of the feedback information is multiple bits. .
  • specific values may be respectively set for the interval of the subcarrier and the number of symbols of the transmission unit, and the two specific values correspond to a feedback bit number.
  • Tables 7, 8, and 9 show three possible ways to do this:
  • the number of bits of the feedback information may be 1 bit (or According to other embodiments, such as subbands; otherwise, the number of bits of the feedback information may be multi-bit, or the number of bits of the feedback information may be determined in combination with other embodiments.
  • the number of bits of the feedback information is associated with the time domain Doppler parameter.
  • the parameters of the channel quality fluctuation can be characterized by the Doppler effect parameter. The higher the Doppler effect parameter, the larger the channel fluctuation.
  • the greater the channel quality fluctuation in the time domain the greater the impact on the same time domain resource, and the higher the uncertainty of whether the data transmission is correct.
  • the Doppler effect is high for the same time domain resource, and the degree of influence of the received channel fluctuates greatly within the range of the time domain resource, and is sometimes greatly affected. That is, the channel quality is poor, resulting in all errors in the data transmission, sometimes small impact, that is, the channel quality is good, and the data transmission is all correct.
  • the Doppler effect is very low, then Within the scope of the time domain resource, the degree of influence of the received channel is basically the same, or is affected by a large influence at the same time, that is, the channel quality is poor, resulting in all the data transmission errors, or the small impact at the same time, that is, the channel quality is good.
  • the data transmission is all correct. At this time, in order to save resource overhead, one bit can be used to feedback whether the data is successfully received.
  • the Doppler parameter when the Doppler parameter reaches 200 Hz, it can be considered that the channel fluctuation is relatively large at this time.
  • the Doppler effect can be reflected in two ways:
  • Measurement information based on the first device or the second device for example, an anisotropy measurement.
  • the base station can determine the level of the Doppler effect according to the measurement information of the terminal.
  • a configurable demodulation reference signal has been introduced in the communication system, and an additional DMRS (additional DMRS) or a DMRS with a high time domain density is generally optionally configured when the Doppler effect is high.
  • additional DMRS additional DMRS
  • the Doppler effect can be determined by whether the communication system is semi-statically or dynamically configured with additional DMRS or DMRS with high time domain density. If additional DMRS or DMRS with high time domain density is configured, multiple bits can be fed back (because the Doppler effect is considered high at this time).
  • the feedback is performed using multiple bits, that is, the number of bits of the feedback information is multiple bits. Otherwise, if the DMRS with the additional DMRS or the high time domain density is not configured, the feedback is performed using 1 bit, that is, the number of bits of the feedback information is 1 bit.
  • the number of bits of the feedback information is related to the number of subbands or the number of carriers of the data transmission.
  • the first device may also be that the transmission condition of the data may be different in each sub-band or each carrier according to the quality condition of the frequency domain channel, so The first device may determine a number of bits of the feedback information by using a signal to noise ratio (SNR) or a channel quality indicator (CQI) of each subband or each carrier.
  • SNR signal to noise ratio
  • CQI channel quality indicator
  • the second device may map the data to multiple sub-bands or multiple carriers to the first device, for example, 1 TB of data is divided into several CBs, each sub-band or each At least 1 CB is mapped on the carrier.
  • the second device or the first device may configure a same modulation and coding scheme (MCS) for each sub-band or each carrier, that is, share an MCS domain indication, or Configure different MCSs, that is, multiple MCS domain indications, or configure different processes.
  • MCS modulation and coding scheme
  • the number of bits of the feedback information may be multiple.
  • each sub-band or each carrier is configured with 1 bit for the feedback.
  • the feedback information is associated with a codebook size of a control message carrying the feedback information.
  • the codebook size refers to an upper limit value of the number of feedback information bits capable of carrying data successfully received in the control message. For example, in the LTE system, the codebook size corresponding to UCI format 3 is 20 bits.
  • the feedback information sent by the first device to the second device needs to be carried in a control message.
  • the control message may be It is uplink control information (UCI). Therefore, the number of bits of the feedback information is limited by the codebook size of the UCI.
  • the codebook size is generally pre-agreed.
  • the first device receives the data sent by the second device.
  • the data includes at least one TB. It can also be said that the data includes at least one data block.
  • the second device may send the data to the first device by using a carrier aggregation manner, for example, when the data includes multiple TBs, respectively transmitting one or more TBs on multiple carriers;
  • the data may be located on different transmission time units, for example, when the data includes multiple TBs, one or more of the TBs may be carried on different time units.
  • the data needs to be fed back by the first device on the same UCI whether the reception is successful.
  • Ni is the original feedback corresponding to the i-th transport block in the at least one TB, without being constrained by the size of the control message codebook.
  • Number of bits, i is an integer of 1 ⁇ i ⁇ L
  • L is the number of TBs included in the data
  • L TBs may be different layers of MIMO, and/or different TRPs, and/or different carriers, and/or different
  • the number is an integer of Ni greater than or equal to 1. (The method for determining Ni can refer to other embodiments of the present application, and the present application does not describe it here.)
  • the number of original feedback bits corresponding to all TBs in the data is added.
  • the Ni determination mode may be that the number of feedback bits of each TB of the L TBs is a fixed value.
  • the i-th TB regardless of the TBS of the TB, regardless of the initial transmission or retransmission, the number of feedback bits is M
  • the method can avoid the problem that the feedback channel number or the CBG number of the TB is not known after the loss of the control channel of a certain TB transmission. If at least 1 TB is lost after using this method (ie, discontinuous transmission or its scheduling information is not detected and lost), then The bit corresponding to the lost TB in the bit may be set to NACK or discontinuous transmission (DTX). Since the number of feedback bits of each TB is determined, the transmitting end and the receiving end can understand the same.
  • DTX discontinuous transmission
  • the Ni determination mode may also be other ways, and may refer to other embodiments or other solutions.
  • the codebook size is now included in the scope of consideration of this embodiment, that is, the Compare with the codebook size, if If the size of the codebook is larger, the control message cannot be accommodated.
  • the feedback information of the bit then as a trade-off, the number of feedback bits corresponding to each TB in the data needs to be reduced or maintained to one, that is, the actual feedback information, the number of feedback bits corresponding to each TB is one; If the M is greater than the codebook size, the control message can be accommodated
  • the feedback information of the bit then each TB is fed back with the original feedback bit number, that is, the number of bits of the feedback information is Bit.
  • the number of bits of the feedback information may be determined by using a HARQ bundle bundling, for example, multiple input multiple output (multiple in multiple Out, MIMO)
  • MIMO multiple in multiple Out
  • this trade-off is made on the number of bits of the feedback information.
  • the upper limit of the codebook size feedback is satisfied, more bits are used for feedback as much as possible to reduce the retransmission information and improve the feedback.
  • the accuracy is determined, and when the upper limit of the codebook size feedback is exceeded, a process of backing up to 1 bit of TB is performed, and the number of bits of the feedback information is reduced to meet the requirements of the system, thereby reducing the overhead of the system.
  • L (L>1) TBs are aggregated and decoded on one UCI (also referred to as HARQ multiplexing)
  • HARQ multiplexing if TB adopts multi-bit feedback, only The dynamic codebook mechanism (for example, the downlink assignment index (DAI) mechanism) is used to determine the codebook size, but the semi-static codebook mechanism cannot be used to determine the UCI size, because for multi-bit feedback, the semi-static codebook mechanism (fixed The TB/physical downlink shared channel (PDSCH) number, which is feedback for the PDSCH that is not transmitted in the feedback window, is too expensive. If the TB uses 1-bit feedback, the dynamic codebook mechanism can be supported. And semi-static codebook mechanism.
  • DAI downlink assignment index
  • the feedback information is associated with the capacity of the control message.
  • the capacity of the control message is an upper limit value of the amount of information that can be carried by the control message, and may also be a payload of the control message.
  • the control message may include other information, such as a rank indication, a channel quality indicator, a precoding matrix indicator, beam correlation information, a scheduling request, and a channel state information reference signal, in addition to the feedback information that may be successfully received by the data.
  • the resource indication, the reference signal received power, the reference signal reception quality, and the like, are not limited in this application.
  • the capacity of the control message not only takes into account the number of bits of the feedback information, but also the number of bits carrying the other information. Therefore, the priority of the feedback information and the manner in which the other information is transmitted or transmitted can be set in conjunction with the capacity of the control message.
  • each TB in the data is fed back using the original feedback bit number
  • Ni is the at least one under the premise of uncontrolled message capacity constraints.
  • the number of original feedback bits corresponding to the i-th transport block in the TB where i is an integer of 1 ⁇ i ⁇ L, L is the number of TBs included in the data, L TBs may be different layers of MIMO, and/or different TRPs , and/or different carriers, and/or TBs transmitted on different transmission time units.
  • the number is an integer of Ni greater than or equal to 1.
  • the method for determining the Ni can be referred to other embodiments of the present application, and the present application does not describe it here.
  • the number of bits occupied by the other messages in the control message is K, and K is a positive integer greater than or equal to 1.
  • the number of original feedback bits corresponding to all TBs in the data is added
  • the capacity of the control message is now included in the scope of consideration of this embodiment, and the And the sum of K Comparing with the capacity of the control message, if Less than or equal to the capacity of the control message, indicating that the control message is accommodated Feedback information of one bit and other information of K bits, then each TB is fed back with the original number of feedback bits, that is, the number of bits of the feedback information is Bits; if stated If the capacity of the control message is greater than the control message, the control message cannot be accommodated.
  • the number of feedback bits corresponding to each TB in the data can be reduced or maintained to 1 bit, that is, the actual feedback information, corresponding to each TB
  • the number of feedback bits is one, and the value of all the TBs in the data added by using 1 bit is L.
  • the number of feedback bits corresponding to each TB in the feedback information is 1 bit, and does not include other information or includes other parts of the information, and may depend on the priority setting in other information, first in the current control.
  • the message includes other pieces of information corresponding to the higher priority.
  • the priority of the feedback information is higher than the sending priority of the other messages, and each TB may use the original bit feedback with a priority lower than the TB and use one bit feedback.
  • the present application can also design a different priority, for example, other messages are sent with a higher priority than the feedback information, or each TB uses 1 bit of feedback higher than each TB can use original bit feedback.
  • the priority or other design, the scheme involved is similar to the above scheme, and will not be described here.
  • this trade-off is made for the number of bits of the feedback information.
  • the upper limit of the capacity of the control message is satisfied, more bits are used for feedback as much as possible to reduce the retransmission information and improve The accuracy of the feedback, and when the upper limit of the capacity of the control message is exceeded, a process of backing up to 1 bit of TB is performed, the number of bits of the feedback information is reduced to meet the requirements of the system, and the overhead of the system is further reduced. Further, The other information may be temporarily not transmitted by the control message transmitted this time to control the number of bits of information carried on the control message.
  • the feedback information is associated with the location of the control message, that is, the channel carried by the control message.
  • the control message may be a UCI.
  • the physical uplink control channel PUCCH
  • the physical uplink control channel PUCCH
  • the short PUCCH can only correspond to one to two symbols in the time domain, and supports transmission of several tens of bits.
  • the long PUCCH can correspond to two symbols or more in the time domain, and supports transmission of several hundred bits.
  • the UCI can be carried on a short PUCCH, such as 1 or 2 symbols, and can be carried on a long PUCCH, such as 14 symbols.
  • the UCI can also be carried on a physical uplink shared channel (PUSCH).
  • PUSCH physical uplink shared channel
  • the PUSCH is a data channel, and the supported transmission bits are generally larger than the control channel (for example, short PUCCH, long PUCCH).
  • the channel capacity or the coverage performance of the short PUCCH, the long PUCCH, and the PUSCH are different. Therefore, the present application may determine the number of bits of the feedback information according to at least the channel where the UCI is located. For example, according to the scenario requirement (such as the scenario considered in Embodiment 6) or the current scheduling situation, if the UCI is carried in the short PUCCH, each TB uses 1 bit in the feedback information; if the UCI is carried in the long PUCCH or the PUSCH. In the feedback information, each TB can use multiple bits, that is, support multiple bits or 1 bit per TB.
  • the second device (which may be a base station) is configured with a current frame format that only supports short PUCCH (for example, the first half of the current slot is a downlink symbol, and only the second half is an uplink symbol). Due to the capacity and coverage performance of the short PUCCH, the short PUCCH only supports certain UCI formats. These formats only support 1 bit feedback per TB. In the feedback information, the number of feedback bits per TB can only be 1 bit.
  • the base station configures the current frame format to support long PUCCH (for example, the current slot is a full uplink slot, or the current consecutive slots are uplink slots, or the number of uplink symbols in the current slot is greater than or equal to 2
  • the UCI format supported by the long PUCCH can support multiple bits per TB for feedback, and in the feedback information, the number of feedback bits per TB is multiple bits.
  • the method for determining the number of bits can be referred to other embodiments of the present application, and the present application does not describe it here.
  • the currently scheduled slot is a PUSCH transmission
  • the UCI is carried on a PUSCH.
  • the PUSCH can support multi-bit feedback per TB in consideration of the capacity and coverage performance of the PUSCH.
  • the feedback bit number of each TB is Multiple bits, or 1 bit.
  • the presence of the plurality of services requires simultaneous data transmission.
  • the plurality of services include a URLLC service and an eMBB service.
  • the data received by the first device may belong to an eMBB service, and may be affected by a related data transmission from a URLLC service during the receiving process, and the impact may be a burst, that is, a bearer. On a few symbols of the time-frequency resource of the data, the reception of the data will be affected, resulting in an increased likelihood of receiving errors.
  • the information related to the influence may be informed to the first device by display or implicitly.
  • the display mode may be that the second device uses the indication information to indicate to the first device, the affected time-frequency resource information, such as the time domain and/or the frequency domain region of the affected time-frequency resource, where Characterized by at least one of a physical block, a physical block group, a symbol, a symbol group, a mini-slot, a mini-slot group, a CB, a CB group, a TB, and a time slot.
  • the indication information may be transmitted in the same transmission time unit in which the data is transmitted, or may be transmitted in a transmission time unit after the transmission time unit in which the data is transmitted.
  • the display mode may further indicate that the second device uses the indication information to indicate to the first device whether the URLLC service is punctured, that is, the impact may be specifically punctured by the URLLC service, where the indication is
  • the information may be only 1 bit, indicating whether URLLC puncturing occurs in the current time slot.
  • the indication may be an on-indication, that is, on the punctured symbol, or may be a post-indication, for example, bearer.
  • the tail symbol of the current eMBB data transmission may also be carried on the next slot of the current eMBB data transmission, or may be carried on the next scheduled slot of the process or other process, and carried in the common control area or control information (such as downlink control information) and so on.
  • the implicit manner may be that the second device indicates the first device by changing a CRC of the sent data, specifically, if the data receives the impact, changing the CB or The CRC of the TB is different from the CRC when it is not affected, and the first device can pass as long as the first device and the second device perform the agreement that the CRC change corresponding data transmission is affected in advance. Detecting the CRC is known to affect the data transmission.
  • the data referred to above is affected, except that the data (ie, eMBB data) may be punctured by the URLLC data, and the time-frequency resource carrying the data may be set to zero power in some areas. Preemption on certain areas results in the data being unsendable, interference indications on certain areas, superimposed transmissions with other data on certain areas, and so on.
  • the present embodiment is different from the foregoing embodiment in that the data specifically includes at least one CB, and the feedback information is associated with whether the partial data corresponding to the at least one CB is affected.
  • the partial data corresponding to the at least one CB may be a part of the at least one CB data stream.
  • the at least one CB is a plurality of CBs, it may be a data stream of one CB or a plurality of CBs of the plurality of CBs.
  • the number of bits of the feedback information may be determined to be multiple bits. Further, if the CB is multiple, at least one bit of the feedback information is used to correspond to the unaffected portion of the data, that is, at least one bit is used to indicate that the plurality of CBs are unaffected. Whether the CB is successfully received, and additionally uses at least 1 bit corresponding to the feedback of the affected part of the data, that is, using at least 1 bit to indicate whether the affected CB of the plurality of CBs is successfully received.
  • the feedback information may also be associated with a code rate of the data.
  • a code rate of the data For example, if the data is affected by the influence, if the code rate of the data is high (or the MCS is large), at least 1 bit of the feedback information is used to correspond to the unaffected data portion, that is, The use of at least one bit indicates whether the unaffected CB of the plurality of CBs is successfully received.
  • the feedback is not performed on the affected part of the data, because the high code rate at this time necessarily causes the reception of the affected part of the data to fail, so no additional feedback is needed.
  • the second device may be in the The first device immediately retransmits or retransmits the affected portion of the data before performing feedback.
  • the code rate of the data is low (or the MCS is small)
  • at least 1 bit is used to correspond to the unaffected portion of the data, that is, the at least one bit is used to indicate the plurality of CBs.
  • the unaffected CB is successfully received, and additionally uses at least 1 bit to correspond to the affected part of the data, that is, using at least one bit to indicate whether the affected CB in the plurality of CBs is successfully received.
  • the code rate is low at this time, the affected part of the data still has the possibility of receiving success. Therefore, it is necessary to determine whether the affected part of the data is successfully received according to the specific determination of the first device, and perform feedback. By the above method, the overhead of feedback can be saved.
  • the level of the code rate may be determined by comparing with a threshold. When the threshold is greater than or equal to the threshold, the first device may consider that the code rate is higher. When the threshold is smaller than the threshold, the first A device can consider the code rate to be low, such that the first device can apply the above solution according to the result of the comparison.
  • the feedback information may further determine a number of bits of the feedback information whether the second device retransmits or retransmits the affected portion of the data before the sending of the feedback information.
  • the feedback information may use a total of 1 bit, and the base station does not retransmit or retransmit the data before the feedback.
  • the affected CB uses at least 1 bit of feedback corresponding to the unaffected CB in the data, and additionally uses at least 1 bit to correspond to the affected CB in the data. In this way, the overhead of feedback can be saved.
  • multiple bits may also be used for feedback, for example, using multiple bits to indicate that the first device receives the quality of the CB, the quality.
  • the second device can determine the amount of data to be retransmitted based on this.
  • CBG CB group
  • the content of the feedback information may be 0101 (representing that the first and third CBGs are not successfully received, and the second and fourth CBGs are successfully received).
  • DCI downlink control information
  • the first device After receiving the retransmitted DCI and the retransmitted data, performs data processing, for example, performing HARQ combining with the previously transmitted data, and re-feeding feedback according to the processing result.
  • the second device After the second device sends data, the impact of the URLLC service on the data is sent, and a small number of puncturing indications (such as 1 bit) are sent to indicate whether the puncturing of the URLLC service exists at the receiving end.
  • the first device determines the number of feedback bits according to whether the punching indication is received. For example, if there is a punch indication, there is multi-bit feedback, ie feedback 0101 (representing the 1st and 3rd CBG NACK).
  • Retransmit data After receiving the retransmitted DCI and the retransmitted data, the first device performs data processing, for example, combining or extracting the previously affected cached data with the previously transmitted data, and performing new feedback according to the processing result
  • the second device After the second device sends data, the impact of the URLLC service on the data is sent, and a small number of puncturing indications (such as 1 bit) are sent to indicate whether the puncturing of the URLLC service exists at the receiving end.
  • the first device determines the number of feedback bits according to whether the punching indication is received. For example, if there is a puncturing indication, for example, if there is a puncturing indication, multi-bit feedback, that is, feedback 0101 (representing the first and third CBG NACKs).
  • the second device After receiving the feedback information, the second device includes an index or a number indication of the current retransmission CBG in the retransmission DCI, for example, 1010 represents retransmission of the first and third CBGs, and further, the retransmission DCI may be Including multiple retransmission type indications (ordinary retransmission, or special retransmission; for example, normal retransmission corresponds to "1", special retransmission corresponds to "0"), and each retransmission type indication corresponds to 1 CBG, for example 1101 represents the third CBG as a special retransmission, for example, retransmission is affected by URLLC puncturing, and the first CBG is a normal retransmission.
  • the retransmission DCI may be Including multiple retransmission type indications (ordinary retransmission, or special retransmission; for example, normal retransmission corresponds to "1", special retransmission corresponds to "0"
  • each retransmission type indication corresponds to 1
  • the second device After receiving the retransmitted DCI and the retransmitted data, the second device performs data processing, for example, combining the first CBG initial transmission data HARQ, and buffering the affected cache data before the third CBG erasure. And make new feedback based on the processing results.
  • another independent domain may be introduced for each CBG, for example, multiple redundancy versions (RVs), etc.; or only one retransmission type indication (normal retransmission, Or special retransmissions), so it may take multiple retransmissions.
  • RVs redundancy versions
  • special retransmissions special retransmissions
  • the indication information of whether to perform HARQ merging may also be added to the downlink control information. For example, if the transmission of the previously scheduled data is affected by the preemption of the URLLC service, it may be indicated that some or all of the currently transmitted CBGs are not merged with the previous data HARQ to improve the decoding success rate.
  • the HARQ combination referred to in this embodiment is to combine the currently received data with the data in the previously transmitted buffer for decoding.
  • the feedback information is associated with the size of the data, that is, the TBS.
  • the data can correspond to TB, and the TB is further divided into multiple CBs for transmission.
  • the entire TB still needs to be retransmitted, which leads to low communication efficiency. Therefore, the number of bits of the feedback information can be determined according to the TBS.
  • an MCS field exists in the corresponding control information, and is used to indicate a modulation mode and a TBS used by the currently scheduled data transmission.
  • the CB number is M
  • M is a positive integer greater than or equal to 1.
  • the number of bits N of the feedback information is determined according to the M, and N is a positive integer greater than or equal to 1. For example, if the M is less than the threshold 1, the N value is determined to be 1 bit. Otherwise, if the M is less than the threshold 2, the N value is determined to be 2 bits. Otherwise, if the M is less than the threshold 3, the N value is determined to be 3 bits.
  • the N is determined as the maximum number of feedback bits of the communication system.
  • the threshold 1 ⁇ the threshold 2 ⁇ the threshold 3, and so on.
  • the number of thresholds can be determined according to actual conditions, and can be greater than or equal to one threshold.
  • Each of the thresholds may be determined based on a compromise between performance and cost, and the threshold is generally pre-agreed between the first device and the second device.
  • the feedback information is 1 bit.
  • the feedback information may be the maximum number of feedback bits supported by the communication system.
  • the number of bits of the feedback information may be determined according to the number of CBGs, and each bit corresponds to one CBG feedback.
  • the specific possible CB grouping method may be as follows:
  • the CB of the second CBG is ⁇ 3, 4 ⁇ of the CB number in the TB
  • the CB of the third CBG is the ⁇ 5, 6 ⁇ of the CB number in the TB.
  • M is not divisible by N1, the number of CBs of one or more CBGs will be less than N1.
  • the first CBG is formed by the first 4 CBGs
  • the second CBG is formed by the last 3 CBGs (or the first CBG is formed by the first 3 CBGs, and the second CBG is formed by the last 4 CBGs).
  • the maximum supported CBG number N2 can be introduced by convention, and N2 is greater than or equal to 1 and belongs to an integer. When the number of CBGs exceeds N2, the size of each CBG needs to be adjusted.
  • the CB of the 4 CBGs is ⁇ 1, 2, 3 ⁇ , ⁇ 4, 5, 6 ⁇ , ⁇ 7, 8, 9 ⁇ , ⁇ 10 of the CB number in the TB. , 11, 12 ⁇ .
  • the minimum CB number N3 in the CBG is introduced by convention, and N3 is greater than or equal to 1 and belongs to an integer, and N3 ⁇ N2.
  • the total CB number M is 3, it is 2 CBGs, and the CB of 2 CBGs is ⁇ 1, 2 ⁇ of the CB number in TB. ⁇ 3 ⁇ or ⁇ 1 ⁇ , ⁇ 2, 3 ⁇ .
  • the CBG number or the maximum supported CBG number N2 is pre-agreed, and the size of the CBG number (for example, the number of bits of the CBG) is obtained according to the TBS, and whether each CBG is further divided into more CBs depends on the size of the CBG (for example, CBG bits)
  • the number (where CRC may or may not be included) is greater than a certain maximum value, such as 6144 bits or 8192 bits, and is further divided by the LTE system class).
  • the TBS which may or may not contain CRC
  • the TBS which may or may not contain CRC
  • each CBG is 10000 bits. Since it may contain CRC, it may or may not contain CRC.
  • each CBG is greater than the maximum value of 6144 bits, so each CBG needs to be subdivided into 2 CBs.
  • the minimum number of bits that can be introduced into the CBG can be pre-agreed.
  • each The CBG contains 500 bits, which is less than the minimum number of bits, and is actually divided into 2 CBGs, each CBG is 10000 bits, since 10000 bits may or may not contain CRC greater than the maximum value, for example, 6144 bits, so each CBG Need to be divided into 2 CBs.
  • Method 1 Take one or several symbols in the time domain as a group. For example, if there are 12 data symbols in one slot (regardless of the symbols that only carry control), then there are two groups of symbols, that is, there are 6 groups.
  • Manner 2 One or more RBs, subbands, or carriers in the frequency domain are grouped.
  • the information associated with the number of bits of the feedback information is different from the above embodiment, and the rest is the same and will not be described again.
  • the number of bits of the feedback information may be multiple.
  • the first device is a terminal
  • the second device is a base station
  • the first device can learn that there is burst interference according to the channel measurement result, and the number of bits of the feedback information is multiple.
  • the number of bits of the feedback information may be multiple.
  • the number of bits of the feedback information may be at least according to the cooperative signaling received by the first device from the second device. It is determined, for example, that multiple base stations are all served by one or more terminals, and the number of bits of the feedback information may be multiple bits, because there may be problems such as measurement when cooperating. For specific determination manners, reference may also be made to one or more of the other various embodiments of the present application.
  • the number of bits of the feedback information after the end of the cooperation may be returned to one.
  • the collaboration may be interference-free collaboration.
  • the feedback information may be 1 bit when there is interference coordination, because there is no interference after the interference cooperation at this time, and the feedback information may be a plurality of bits when there is no cooperation.
  • the mode switching may include: the first device switches the digital mode to the analog mode, or the analog mode switches to the digital mode, when the digital mode is switched.
  • the feedback information may take 1 bit when in the analog mode, or may be multi-bit when the analog mode is switched to the digital mode.
  • the number of bits of the feedback information may be multiple, for example, the specific mode is a digital mode, because the direction of the beam is relatively dispersed at this time, and needs to be directed to each direction. Whether the data is correctly received or not is fed back with different bits.
  • the number of bits of the feedback information needs to be multiple.
  • the above various embodiments indicate that the relationship between the factors indicated in the respective embodiments and the number of bits of the feedback information is separately considered, and the factors may include: the size of the transmission time unit, the interval of the subcarriers. The time slot symbol of the transmission time unit, the time domain Doppler parameter, the DMRS configuration, the number of subbands or the number of carriers of the data transmission, whether there is burst interference or cooperation, the switching mode, and the codebook size of the control message. Controlling the capacity of the message, the location of the control message, the indication information indicating that the data reception is affected in the multi-service coexistence scenario, the code rate of the data, whether to retransmit or retransmit before the transmission of the feedback information, and TBS And so on.
  • multiple factors in all the above embodiments may be comprehensively considered to determine the number of bits of the feedback information. That is, a combination can be made between the above two or more embodiments.
  • the size of the transmission time unit is less than a threshold, the size of the feedback information is 1 bit, (optionally, multiple bits may be considered in conjunction with the subband configuration). If the size of the transmission time unit is greater than or equal to the threshold, the first device may determine the number of bits of the feedback information in combination with the time domain Doppler parameter, for example, if the first device is configured with an additional DMRS, The number of bits of the feedback information is multi-bit, otherwise the number of bits of the feedback information may still be 1 bit. For the remaining solutions, reference may be made to the various embodiments described above.
  • the size of the transmission time unit is less than a threshold, the size of the feedback information is 1 bit. If the size of the transmission time unit is greater than or equal to the threshold, the first device may determine the number of bits of the feedback information according to the number of subbands or the number of carriers of the data transmission, for example, if the data transmission When the number of subbands or the number of carriers is multiple, the number of bits of the feedback information is multiple bits, otherwise the number of bits of the feedback information may still be 1 bit.
  • the various embodiments described above reference may be made to the various embodiments described above.
  • the manner of determining the number of bits of the feedback information may be determined by a pre-agreed, the first device of the data receiving device determines the number of bits of the feedback information according to the agreement, or may be static or dynamic by the radius of the data.
  • the second device of the sender such as the base station, indicates the number of bits of the feedback information to the first device of the data, such as the terminal.
  • the second device indicates to the first device by using high layer signaling, such as radio resource control (RRC) signaling, and does not receive new information in the first device.
  • RRC radio resource control
  • the number of bits of the feedback information is always determined according to the indication.
  • the high-level signaling notifies whether the multi-bit feedback mode is enabled. If not, the data is always used for one TB corresponding to one bit in each data scheduling process, and if it is enabled, in each data scheduling process.
  • the number of bits of feedback information used by each TB may be determined according to one or more of the above embodiments or other modes other than the present invention.
  • the second device sends an indication to the first device by using physical layer signaling, and the following information is controlled, for example, adding a new indication field to the downlink control information.
  • the indication may change in each data schedule.
  • the first device After the first device is configured to use the multi-bit feedback (also referred to as CBG-level feedback) or the CBG-level transmission, the first device is configured as a terminal, and the second device is a base station.
  • the second device may include indication information in the DCI sent to the first device, where the indication information is used to indicate which CBG of the TB that is transmitted this time.
  • the transmission may be an initial transmission or a retransmission.
  • the data may include at least one CBG.
  • the indication information may also indicate the number of groups into which the data is divided.
  • the embodiment uses a certain state or a certain value in the indication information to indicate that the first device falls back to the 1-bit feedback and/or the TB-level transmission.
  • the indication information indicates that no code block group needs to be transmitted.
  • This state does not make any sense, that is to say, it does not need to give an additional indication to the first device itself, nor does it occur in actual communication. Therefore, the new device can be instructed to indicate to the first device that the indication information indicates that no CBG needs to be transmitted.
  • the base station may decide to fall back to the 1-bit feedback mechanism.
  • the indication information may be used to indicate that no CBG needs to be transmitted, and it is re-defined as a feedback mechanism for instructing the first device to fall back to 1 bit at least in the current scheduling period (also referred to as feedback TB). Level feedback).
  • the current transmission is also the entire TB (ie, all code block groups). ), that is, the new meaning is that the scheduled transmission is the entire TB (all CBGs are transmitted, and the first device uses a 1-bit feedback manner for feedback.
  • the indication information may be embodied in the form of a bitmap, or may be embodied in the form of an existing indication field in the downlink control information, or jointly encoded with an existing indication field. reflect.
  • the number of bits corresponding to the indication information may also be N. Assuming that the value on each bit of the indication information is "1”, it represents the corresponding CBG for transmission. When the value on each bit is "0”, it means that the corresponding CBG is not transmitted. (The above is only an example. When the value on each bit of the indication information is “1”, it means that the corresponding CBG is not transmitted. When the value on each bit is “0”, it represents the corresponding CBG. The transmission is performed.
  • the value on each bit of the indication information is compared to the value on the corresponding bit of the indication information transmitted previously, and the transmission is performed, and the non-reversal represents no transmission.
  • the value on each bit is compared with the value on the corresponding bit of the previous indication information, and the value is reversed to indicate no transmission, and the other is not to be reversed for transmission, etc., which is not limited in this application.
  • the value of the indication information is "0000”
  • no CBG needs to be transmitted, that is, no data needs to be transmitted this time.
  • the indication information is “0000”
  • a new indication meaning is specified for the new device, and the new meaning is consistent with the first device and the second device. Representing the first device to use 1 bit to feed back the transmitted data, that is, to fall back to the 1-bit feedback mechanism.
  • the first device receives the control information sent by the second device, and the control information includes indication information, where the indication information is used to indicate the sending of each CBG included in the transport block TB when the CBG-level feedback is based. State, the number of the CBG is greater than or equal to 1;
  • the first device When the indication information indicates that the sending status is the first status, the first device receives the TB sent by the second device, and performs feedback on whether the TB is successfully received based on 1 bit.
  • the first state is that each of the CBGs is not sent.
  • the first state is that the indication information field is all 0.
  • the so-called terabyte feedback (or terabyte HARQ feedback) is 1-bit feedback. If the TB decoding is successful (ie, the CRC of all CBs passes, the CRC of the TB is also verified), the ACK is fed back, otherwise the NACK is fed back.
  • the so-called CBG-level feedback (or CBG-level HARQ feedback) is the feedback of the HARQ-ACK to the CBG, and the decoding result. If a CBG is successfully decoded (the CRC of all CBs in the CBG passes, if the CBG adds the CRC) The CRC of the CBG also needs to be verified. Then the ACK is fed back, otherwise the NACK is fed back. )
  • different resources may be respectively corresponding, that is, feedback is performed on different resources, or UCI format ( UCI format).
  • UCI format UCI format
  • the first UCI format can be used
  • the second UCI format can be used.
  • the corresponding resource may be the first resource.
  • the corresponding resource may be the second resource.
  • the corresponding relationship between the feedback mode and the resource and the UCI format may be pre-configured by the base station or may be determined based on downlink control information and/or higher layer signaling.
  • the determining manner of the first resource and the second resource may be one of the following situations: 1) implicitly determining by using a control channel element (CCE) index in the DCI;
  • the high-level signaling eg, RRC signaling
  • RRC signaling is jointly determined with the content of the DCI, for example, a set of resources is configured by higher layer signaling, and the downlink control information indicates at least one resource in the set.
  • FIG. 7 A schematic structural diagram of a communication device 700 provided by the implementation of the present application. As shown in FIG. 7, the communication device 700 includes a transceiver 701, a processor 702, a memory 703, and a bus system 704;
  • the memory 703 is used to store a program.
  • the program can include program code, the program code including computer operating instructions.
  • the memory 703 may be a random access memory (RAM) or a non-volatile memory such as at least one disk storage. Only one memory is shown in the figure, of course, the memory can also be set to a plurality as needed. Memory 703 can also be a memory in processor 702.
  • the memory 703 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:
  • Operation instructions include various operation instructions for implementing various operations.
  • Operating system Includes a variety of system programs for implementing various basic services and handling hardware-based tasks.
  • the processor 702 controls the operation of the communication device 700, which may also be referred to as a central processing unit (CPU).
  • the various components of the communication device 700 are coupled together by a bus system 704, which may include, in addition to the data bus, a power bus, a control bus, a status signal bus, and the like.
  • bus system 704 may include, in addition to the data bus, a power bus, a control bus, a status signal bus, and the like.
  • bus system 704 may include, in addition to the data bus, a power bus, a control bus, a status signal bus, and the like.
  • various buses are labeled as bus system 704 in the figure. For ease of representation, only the schematic drawing is shown in FIG.
  • Processor 702 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 702 or an instruction in a form of software.
  • the processor 702 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or discrete hardware. Component.
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 703, and the processor 702 reads the information in the memory 703, and performs the method steps of the first device according to any one of the foregoing embodiments 1 to 12 in combination with the hardware thereof; or executes the above embodiment in combination with the hardware thereof.
  • Method steps of the second device of any of one to twelve.
  • the communication device 700 provided by this embodiment can determine the bit used for feedback according to different situations, thereby achieving a tradeoff between communication efficiency and feedback overhead in the communication system.
  • the various illustrative logic blocks, modules and circuits described in the embodiments of the present application may be implemented by a general purpose processing unit, a digital signal processing unit, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic. Devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above are designed to implement or operate the functions described.
  • the general purpose processing unit may be a micro processing unit.
  • the general purpose processing unit may be any conventional processing unit, controller, microcontroller or state machine.
  • the processing unit may also be implemented by a combination of computing devices, such as a digital signal processing unit and a microprocessing unit, a plurality of microprocessing units, one or more microprocessing units in conjunction with a digital signal processing unit core, or any other similar configuration. achieve.
  • the steps of the method or algorithm described in the embodiments of the present application may be directly embedded in hardware, a software module executed by a processing unit, or a combination of the two.
  • the software modules can be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium in the art.
  • the storage medium can be coupled to the processing unit such that the processing unit can read information from the storage medium and can write information to the storage medium.
  • the storage medium can also be integrated into the processing unit.
  • the processing unit and the storage medium may be configured in an ASIC, and the ASIC may be configured in the user terminal. Alternatively, the processing unit and the storage medium may also be configured in different components in the user terminal.
  • the above-described functions described in the embodiments of the present invention may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, these functions may be stored on a computer readable medium or transmitted as one or more instructions or code to a computer readable medium.
  • Computer readable media includes computer storage media and communication media that facilitates the transfer of computer programs from one place to another.
  • the storage medium can be any available media that any general purpose or special computer can access.
  • Such computer-readable media can include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage device, or any other device or data structure that can be used for carrying or storing Other media that can be read by a general purpose or special computer, or a general or special processing unit.
  • any connection can be appropriately defined as a computer readable medium, for example, if the software is from a website site, server or other remote source through a coaxial cable, fiber optic computer, twisted pair, digital subscriber line (DSL) Or wirelessly transmitted in, for example, infrared, wireless, and microwave, is also included in the defined computer readable medium.
  • DSL digital subscriber line
  • the disks and discs include compact disks, laser disks, optical disks, DVDs, floppy disks, and Blu-ray disks. Disks typically replicate data magnetically, while disks typically optically replicate data with a laser. Combinations of the above may also be included in a computer readable medium.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de rétroaction comprenant les étapes suivantes : un premier dispositif reçoit des données envoyées par un second dispositif ; le premier dispositif envoie des informations de rétroaction indiquant si les données ont été reçues avec succès au second dispositif, le nombre de bits dans les informations de rétroaction étant associé à la taille d'une unité de temps de transmission dans le système de communication. Le procédé ci-dessus détermine le nombre de bits dans les informations de rétroaction d'après la taille de l'unité de temps de transmission. Le procédé combine ainsi de manière flexible l'efficacité de transmission et le surdébit de rétroaction dans un système de communication, améliorant les performances de l'ensemble du système de communication.
PCT/CN2018/073654 2017-01-26 2018-01-22 Procédé, dispositif, et système de rétroaction WO2018137584A1 (fr)

Priority Applications (3)

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EP18744155.5A EP3550752B1 (fr) 2017-01-26 2018-01-22 Procédé, dispositif, et système de rétroaction
JP2019540436A JP6837564B2 (ja) 2017-01-26 2018-01-22 フィードバック方法、デバイス、及びシステム
US16/516,307 US20190342053A1 (en) 2017-01-26 2019-07-19 Feedback Method, Device, and System

Applications Claiming Priority (4)

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CN201710061738.2 2017-01-26
CN201710061738 2017-01-26
CN201710409456.7A CN108365922B (zh) 2017-01-26 2017-06-02 用于反馈的方法、设备和系统
CN201710409456.7 2017-06-02

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