WO2017107904A1 - Procédé, dispositif et système de transmission sur la base d'une demande de répétition automatique hybride (harq) - Google Patents

Procédé, dispositif et système de transmission sur la base d'une demande de répétition automatique hybride (harq) Download PDF

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Publication number
WO2017107904A1
WO2017107904A1 PCT/CN2016/111113 CN2016111113W WO2017107904A1 WO 2017107904 A1 WO2017107904 A1 WO 2017107904A1 CN 2016111113 W CN2016111113 W CN 2016111113W WO 2017107904 A1 WO2017107904 A1 WO 2017107904A1
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WIPO (PCT)
Prior art keywords
physical layer
codeword
retransmitted
data
base station
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PCT/CN2016/111113
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English (en)
Chinese (zh)
Inventor
蔺同宇
梁家伟
吕梦阳
望育梅
田春长
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华为技术有限公司
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Publication of WO2017107904A1 publication Critical patent/WO2017107904A1/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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a method, device and system for transmitting based on a hybrid automatic repeat request (English abbreviation: HARQ).
  • HARQ hybrid automatic repeat request
  • delay sensitive service includes: social, web browsing, online game, etc.
  • delay is not sensitive Services include: video, application download, storage and other services.
  • the flow service is insensitive because the flow service does not have real-time interaction requirements, and the local service is usually provided with a cache to keep the service for a certain period of time.
  • Figure 1 shows the percentage of total traffic consumption in China's various services. As can be seen from the figure, the amount of delay-insensitive traffic data accounts for 75% of the total downlink traffic.
  • the traditional HARQ mechanism retransmits data in the case where the cyclic redundancy check (English full name: cyclic redundancy check, English abbreviation: CRC) fails to pass the verification. All resources of the user equipment (English name: user equipment, English abbreviation: UE) will be occupied for the next time, that is, the data to be retransmitted needs to fill the currently available physical resources during retransmission, which is for delay-insensitive business data. Larger features can cause excessive redundant information to be transmitted, resulting in waste of physical resources and reduced resource utilization.
  • CRC cyclic redundancy check
  • the embodiments of the present invention provide a method, an apparatus, and a system for performing HARQ transmission, so as to at least solve the problem that the existing HARQ mechanism needs to fill the retransmitted data with the currently available physical resources during retransmission, which is related to the amount of delay-insensitive service data. Large features can cause excessive redundant information to be transmitted, resulting in waste of physical resources.
  • the embodiment of the present invention provides the following technical solutions:
  • a method for hybrid automatic repeat request HARQ transmission comprising:
  • the base station performs physical layer framing to obtain a physical layer frame, where the physical layer frame includes a redundancy version of each of the M codewords to be retransmitted and/or a codeword of the first new data, the first The codeword of the newly transmitted data is obtained by the base station performing error estimation coding on the first new transmission data, and then performing channel coding, where the codeword of the first new transmission data is used to fill the currently available physical resources. Remaining resources other than the resources occupied by the redundancy versions of the M codewords that need to be retransmitted, and M is a positive integer not less than one;
  • the base station modulates the physical layer frame, and sends the modulated physical layer frame to the user equipment UE.
  • the performing, by the base station, the physical layer framing, and obtaining the physical layer frame specifically:
  • the base station performs physical layer framing according to a preset rule to obtain a physical layer frame, where the preset rule includes:
  • the redundancy versions of the codewords that need to be retransmitted are in the front, and the codewords of the newly transmitted data are in the back. If M>1, the M codewords that need to be retransmitted are used.
  • the respective redundancy versions are sorted in the order in which the corresponding error data is transmitted.
  • whether the transmitted codeword is Retransmission codeword is Retransmission codeword
  • the base station sends a retransmission data identifier RTDI to the UE, where the RTDI is used to indicate whether each transmitted codeword is a retransmission codeword.
  • the physical layer frame includes a header header, where the header includes a retransmission data identifier RTDI, and the RTDI is used to indicate whether each transmitted codeword is a retransmission codeword. .
  • the method further includes:
  • an error location estimation check result sent by the UE where the error location estimation check result includes, after the UE performs channel decoding and error location estimation verification on S codewords that need to be retransmitted respectively.
  • the error location estimation verification result; and/or the error location estimation verification result obtained by the UE performing channel decoding and error location estimation verification on the codeword of the second new transmission data, S is not less than 1 Positive integer
  • the base station determines, according to the error location estimation check result, a data amount of each of the redundancy versions of the M codewords that need to be retransmitted;
  • the base station performs physical layer framing to obtain a physical layer frame, including:
  • the redundancy version of the mth codeword that needs to be retransmitted in the redundancy version of each of the M codewords that need to be retransmitted includes Km packets of the mth codeword that needs to be retransmitted at least one redundancy version of the packet, K m is the number of the m-th packet to be retransmitted codeword, K m is a positive integer not less than 2.
  • the obtained physical layer frame includes the redundancy versions of the M codewords that need to be retransmitted and/or Or a codeword of the first new data, where the codeword of the first new data is used to fill the resources of the currently available physical resources except for the redundancy versions of the M codewords that need to be retransmitted. Remaining resources outside. That is to say, unlike in the prior art, the retransmission data will occupy all the resources scheduled for the UE next time, that is, it needs to be retransmitted when retransmitting.
  • the data fills up the currently available physical resources, causing excessive redundant information to be transmitted.
  • the codewords of the newly transmitted data are used to fill the currently available physical resources, except for the M.
  • the remaining resources other than the resources occupied by the respective redundant versions of the transmitted codewords will reduce the transmission of redundant resources, thereby reducing the waste of physical resources and improving the utilization of resources.
  • the base station further performs error estimation coding on the first new transmission data, so that the UE may feedback the corresponding error position estimation verification result after performing error estimation verification, and may estimate the error when the error estimation verification is performed.
  • a method for hybrid HARQ transmission based on hybrid automatic repeat request comprising:
  • the user equipment UE receives a physical layer frame sent by the base station, where the physical layer frame includes a redundancy version of each of the M codewords to be retransmitted and/or a codeword of the first new data, the first new data.
  • the codeword is obtained by the base station performing error estimation coding on the first new transmission data, and then performing channel coding, where the codeword of the first new transmission data is used to fill the currently available physical resources except the M
  • M is a positive integer not less than one;
  • the UE needs to retransmit the M according to the redundancy version of each of the M codewords that need to be retransmitted.
  • the codewords are respectively subjected to channel decoding and error location estimation check to obtain a corresponding error location estimation check result; and, if the physical layer frame includes the codeword of the first new transmit data, the UE is The codeword of the first new transmission data is subjected to channel decoding and error position estimation verification, and a corresponding error position estimation verification result is obtained;
  • the UE sends the error location estimation check result to the base station.
  • the redundancy version of the mth codeword that needs to be retransmitted in the redundancy version of each of the M codewords that need to be retransmitted includes Km packets of the mth codeword that needs to be retransmitted at least one redundancy version of the packet, K m is the number of the m-th packet to be retransmitted codeword, K m is a positive integer not less than 2.
  • whether the transmitted codeword is a retransmission codeword can be indicated as follows:
  • the UE receives the retransmission data identifier RTDI sent by the base station, and the RTDI is used to indicate whether each transmitted codeword is a retransmission codeword.
  • the physical layer frame includes a header header, where the header includes a retransmission data identifier RTDI, and the RTDI is used to indicate whether each transmitted codeword is a retransmission codeword. .
  • the physical layer frame sent by the base station that is received by the UE includes a redundancy version of each of the M codewords that need to be retransmitted, and/or the first new Transmitting a codeword of the data, wherein the codeword of the first new data is used to fill remaining resources of the currently available physical resources except for the resources occupied by the redundancy versions of the M codewords that need to be retransmitted .
  • the retransmission data occupies all the resources scheduled for the UE next time, that is, the data to be retransmitted needs to fill the currently available physical resources during retransmission, thereby causing excessive transmission. Redundant information.
  • the codewords of the newly transmitted data are used to fill the currently available physical resources, except for the M.
  • the remaining resources other than the resources occupied by the respective redundant versions of the transmitted codewords will reduce the transmission of redundant resources, thereby reducing the waste of physical resources and improving the utilization of resources.
  • the base station further performs error estimation coding on the first new transmission data, so that the UE may feedback the corresponding error position estimation verification result after performing error estimation verification, and may estimate the error when the error estimation verification is performed.
  • the UE may feedback the corresponding error position estimation verification result after performing error estimation verification, and may estimate the error when the error estimation verification is performed.
  • only the new redundancy version of the error portion of the codeword can be retransmitted, which will greatly reduce the amount of retransmitted data, reduce the waste of physical resources, and enable more transmissions on the current physical resources. New data is being transmitted, which further improves the utilization of resources.
  • a third aspect provides a base station, where the base station includes: a processing unit and a sending unit;
  • the processing unit is configured to perform physical layer framing, obtain a physical layer frame, where the object The physical layer frame includes a redundancy version of each of the M codewords to be retransmitted and/or a codeword of the first new transmission data, where the codeword of the first new transmission data is the base station to the first new Transmitting data by performing error estimation coding and then performing channel coding, wherein the codeword of the first new transmission data is used to fill a redundancy version of each of the currently available physical resources except for the M codewords that need to be retransmitted.
  • the remaining resources other than the resources, M is a positive integer not less than 1;
  • the processing unit is further configured to modulate the physical layer frame
  • the sending unit is configured to send the modulated physical layer frame to the user equipment UE.
  • processing unit is specifically configured to:
  • Performing physical layer framing according to a preset rule to obtain a physical layer frame where the preset rules include:
  • the redundancy versions of the codewords that need to be retransmitted are in the front, and the codewords of the newly transmitted data are in the back. If M>1, the M codewords that need to be retransmitted are used.
  • the respective redundancy versions are sorted in the order in which the corresponding error data is transmitted.
  • whether the transmitted codeword is a retransmission codeword can be indicated as follows:
  • the sending unit is further configured to send a retransmission data identifier RTDI to the UE, where the RTDI is used to indicate whether each transmitted codeword is a retransmission codeword.
  • the physical layer frame includes a header header, where the header includes a retransmission data identifier RTDI, and the RTDI is used to indicate whether each transmitted codeword is a retransmission codeword. .
  • the base station further includes a receiving unit
  • the receiving unit is configured to: if the physical layer frame includes a redundancy version of each of the M codewords that need to be retransmitted, perform physical layer framing in the framing unit to obtain a physical layer frame, and receive the The error location estimation verification result sent by the UE, where the error location estimation verification result includes an error location estimation obtained by the UE after performing channel decoding and error location estimation verification on the S codewords that need to be retransmitted respectively. And a result of the error position estimation verification obtained by the UE performing channel decoding and error position estimation verification on the codeword of the second new transmission data, where S is a positive integer not less than 1;
  • the processing unit is further configured to: if the error location estimation check result indicates that the check has an error, determine, according to the error position estimation check result, a data amount of each of the redundancy versions of the M codewords that need to be retransmitted;
  • the processing unit is specifically configured to:
  • the redundancy version of the mth codeword that needs to be retransmitted in the redundancy version of each of the M codewords that need to be retransmitted includes Km packets of the mth codeword that needs to be retransmitted at least one redundancy version of the packet, K m is the number of the m-th packet to be retransmitted codeword, K m is a positive integer not less than 2.
  • the obtained physical layer frame when the base station performs physical layer framing, includes respective redundancy versions of M codewords to be retransmitted and/or the first new one. Transmitting a codeword of the data, wherein the codeword of the first new data is used to fill remaining resources of the currently available physical resources except for the resources occupied by the redundancy versions of the M codewords that need to be retransmitted . That is to say, unlike in the prior art, the retransmission data occupies all the resources scheduled for the UE next time, that is, the data to be retransmitted needs to fill the currently available physical resources during retransmission, thereby causing excessive transmission. Redundant information.
  • the base station when the redundancy versions of the M codewords that need to be retransmitted are not filled with the currently available physical resources, the codewords of the newly transmitted data are used to fill the currently available physical resources, except for the M.
  • the remaining resources other than the resources occupied by the respective redundant versions of the transmitted codewords will reduce the transmission of redundant resources, thereby reducing the waste of physical resources and improving the utilization of resources.
  • the base station further performs error estimation coding on the first new transmission data, so that the UE may feedback the corresponding error position estimation verification result after performing error estimation verification, and may estimate the error when the error estimation verification is performed.
  • a user equipment UE includes: a receiving unit, a processing unit, and a sending unit;
  • the receiving unit is configured to receive a physical layer frame sent by the base station, where the physical layer frame includes a redundancy version of each of the M codewords to be retransmitted and/or a codeword of the first new transmission data, the codeword of the first new transmission data is an error estimation of the first new transmission data by the base station After coding, the codeword of the first new data is used to fill the resources of the currently available physical resources except for the redundancy versions of the M codewords that need to be retransmitted. For the remaining resources, M is a positive integer not less than one;
  • the processing unit is configured to demodulate the physical layer frame, obtain a demodulated physical layer frame, and perform data separation on the demodulated physical layer frame to obtain the M retransmissions a respective redundancy version of the codeword and/or a codeword of the first new transmitted data;
  • the processing unit is further configured to: if the physical layer frame includes a redundancy version of each of the M codewords that need to be retransmitted, according to a redundancy version of each of the M codewords that need to be retransmitted M code words that need to be retransmitted are respectively subjected to channel decoding and error position estimation check to obtain a corresponding error position estimation check result; and, if the physical layer frame includes the code word of the first new data, Performing channel decoding and error location estimation verification on the codeword of the first new transmission data, and obtaining a corresponding error position estimation verification result;
  • the sending unit is configured to send the error location estimation verification result to the base station.
  • the redundancy version of the mth codeword that needs to be retransmitted in the redundancy version of each of the M codewords that need to be retransmitted includes Km packets of the mth codeword that needs to be retransmitted at least one redundancy version of the packet, K m is the number of the m-th packet to be retransmitted codeword, K m is a positive integer not less than 2.
  • whether the transmitted codeword is a retransmission codeword can be indicated as follows:
  • the receiving unit is further configured to receive a retransmission data identifier RTDI sent by the base station, where the RTDI is used to indicate whether each transmitted codeword is a retransmission codeword.
  • the physical layer frame includes a header header, where the header includes a retransmission data identifier RTDI, and the RTDI is used to indicate whether each transmitted codeword is a retransmission codeword. .
  • the base received by the UE The physical layer frame sent by the station includes a redundancy version of each of the M codewords to be retransmitted and/or a codeword of the first new data, where the codeword of the first new data is used to fill the currently available physics.
  • the base station when the redundancy versions of the M codewords that need to be retransmitted are not filled with the currently available physical resources, the codewords of the newly transmitted data are used to fill the currently available physical resources, except for the M.
  • the remaining resources other than the resources occupied by the respective redundant versions of the transmitted codewords will reduce the transmission of redundant resources, thereby reducing the waste of physical resources and improving the utilization of resources.
  • the base station further performs error estimation coding on the first new transmission data, so that the UE may feedback the corresponding error position estimation verification result after performing error estimation verification, and may estimate the error when the error estimation verification is performed.
  • a fifth aspect provides a base station, including: a processor, a memory, a system bus, and a communication interface;
  • the memory is configured to store a computer to execute instructions
  • the processor is coupled to the memory via the system bus, and when the base station is in operation, the processor executes the computer-executed instructions stored in the memory to enable
  • the base station performs the hybrid automatic repeat request (HARQ) based method according to the first aspect or any one of the possible implementation manners of the first aspect.
  • HARQ hybrid automatic repeat request
  • the base station provided by the embodiment of the present invention may perform the HARQ transmission-based method as described in the foregoing first aspect or any possible implementation manner of the first aspect, and therefore, the technical effects that can be obtained may refer to the foregoing first.
  • the technical effects of the method based on HARQ transmission described in the aspect are not described herein again.
  • a sixth aspect provides a user equipment UE, including: a processor, a memory, a system bus, and a communication interface;
  • the memory is configured to store a computer to execute instructions, and the processor and the memory pass The system bus is connected, the processor executing the computer-executed instructions stored by the memory to enable the UE to perform any one of the possible implementations of the second aspect or the second aspect described above when the UE is running A method based on hybrid automatic repeat request for HARQ transmission as described in the manner.
  • the UE provided by the embodiment of the present invention may perform the HARQ transmission-based method as described in the foregoing second aspect or any possible implementation manner of the second aspect. Therefore, the technical effects that can be obtained may refer to the foregoing second. The technical effects of the method based on HARQ transmission described in the aspect are not described herein again.
  • a seventh aspect a readable medium, comprising computer-executable instructions, when the processor of a base station executes the computer to execute an instruction, the base station performs the method as described in any one of the foregoing first aspect or the first aspect A method based on hybrid automatic repeat request for HARQ transmission.
  • a readable medium comprising computer-executable instructions, when the processor of the user equipment UE executes the computer to execute an instruction, the UE performs any one of the possible implementations of the second aspect or the second aspect The method based on hybrid automatic repeat request for HARQ transmission.
  • FIG. 1 is a schematic diagram showing the percentage of various services in China in total traffic consumption provided by the prior art
  • FIG. 2 is a timing diagram showing a downlink HARQ process provided by the prior art
  • FIG. 3 is a schematic diagram of an existing LTE redundancy version
  • FIG. 4 is a schematic structural diagram of a system based on HARQ transmission according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a general flow of a method based on HARQ transmission according to an embodiment of the present disclosure
  • FIG. 6 is a schematic flowchart of a method for performing HARQ transmission according to a first transmission scenario of a MAC PDU according to an embodiment of the present disclosure
  • FIG. 7 is a first schematic flowchart 1 of a method for performing HARQ transmission according to a j+1 (j is a positive integer not less than 1) transmission scenario of a MAC PDU according to an embodiment of the present disclosure;
  • FIG. 8 is a second schematic flowchart of a method for performing HARQ transmission according to a j+1 (j is a positive integer not less than 1) transmission scenario of a MAC PDU according to an embodiment of the present disclosure
  • FIG. 9 is a schematic flowchart 3 of a method for corresponding HARQ transmission based on a j+1 (j is a positive integer not less than 1) transmission scenario of a MAC PDU according to an embodiment of the present disclosure
  • FIG. 10 is a schematic diagram 1 of a physical layer frame data structure according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram 1 of data redundancy retransmission according to an embodiment of the present invention.
  • FIG. 12 is a schematic diagram 2 of a physical layer frame data structure according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic diagram 2 of data redundancy retransmission according to an embodiment of the present invention.
  • FIG. 14 is a performance diagram of error quantity and retransmission times according to an embodiment of the present invention.
  • FIG. 15 is a performance diagram of a number of translated frames and a transmitted symbol according to an embodiment of the present invention.
  • FIG. 16 is a PSNR and a transmission symbol performance diagram according to an embodiment of the present invention.
  • FIG. 17 is a schematic structural diagram 1 of a base station according to an embodiment of the present disclosure.
  • FIG. 18 is a schematic structural diagram 2 of a base station according to an embodiment of the present disclosure.
  • FIG. 19 is a schematic structural diagram 1 of a UE according to an embodiment of the present disclosure.
  • FIG. 20 is a schematic structural diagram 3 of a base station according to an embodiment of the present disclosure.
  • FIG. 21 is a schematic structural diagram 2 of a UE according to an embodiment of the present disclosure.
  • the HARQ mechanism is used in LTE, which will automatically retransmit the request (English full name: automatic repeat) -request, English abbreviation: ARQ) and forward error correction (English full name: forward error correction, English abbreviation: FEC) mixed use.
  • FEC forward error correction
  • the FEC technique by adding a certain check bit to an information bit (English: bit), the coding rate is lowered, thereby ensuring quality of service.
  • the receiving end determines the correctness of the received data packet by using the CRC information.
  • HARQ can be divided into two types: synchronous and asynchronous. This is also one of the topics discussed in the LTE of the 3rd Generation Partnership Project (English: 3GPP).
  • Synchronous HARQ means that the transmission (retransmission) of a HARQ process occurs at a fixed time. Since the receiving end knows the occurrence time of the transmission in advance, no additional signaling overhead is required to indicate the sequence number of the HARQ process. At this time, HARQ The sequence number of the process can be obtained from the subframe number.
  • the asynchronous HARQ means that the transmission of one HARQ process can occur at any time. The receiving end does not know the time of occurrence of the transmission in advance. Therefore, the processing sequence number of the HARQ process needs to be sent together with the data.
  • HARQ can be divided into two types: non-adaptive and adaptive.
  • the transmission parameters include resource allocation, modulation mode, length of the transport block, and duration of transmission.
  • Adaptive transmission means that in each retransmission process, the transmitting end can change part of the transmission parameters according to the actual channel state information. Therefore, the control signaling of the transmission parameters is sent together in the process of each transmission.
  • the changeable transmission parameters include the modulation mode, the allocation of resources, and the duration of transmission. In a non-adaptive system, these transmission parameters are known in advance with respect to the receiving end, and therefore control signaling information containing transmission parameters does not need to be transmitted in the non-adaptive system.
  • the LTE downlink system uses asynchronous adaptive HARQ technology because of synchronization
  • asynchronous HARQ can make full use of the channel state information to improve the system throughput.
  • asynchronous HARQ can avoid resource allocation conflicts during retransmission and cause performance loss. For example, in synchronous HARQ, if a higher priority process needs to be scheduled, but resources at that time have been allocated to a certain HARQ process, resource allocation will conflict; and asynchronous HARQ retransmission does not occur at a fixed time. At the moment, this problem can be effectively avoided.
  • asynchronous HARQ has the advantages of large scheduling flexibility and can support multiple processes in one subframe.
  • the process of LTE mid-downlink asynchronous HARQ is completed by uplink ACK/NACK signaling transmission, new data indication, downlink resource allocation signaling transmission, and retransmission of downlink data.
  • the channel coding redundancy version of each retransmission is predefined and does not require additional signaling support. Wherein, since the channel coding rate of the downlink HARQ retransmission has been determined, that is, the channel coding efficiency of each retransmission is unchanged, the complete modulation and coding scheme (English name: modulation and coding scheme, English abbreviation: MCS) is not performed.
  • the modulation mode can still be selected, that is, due to the environmental change of the channel, the amount of data that the channel can receive is reduced, and the modulation mode needs to be changed to adapt to the channel change.
  • the change of the modulation mode will cause the difference of the number of resource blocks (English name: resource block, English abbreviation: RB). Therefore, it is necessary to allocate the indication to the UE through the downlink signaling resource.
  • a data indicator of one bit is required.
  • English full name: new data indication, English abbreviation: NDI indicates whether the transmission is new data or data that has not been translated before retransmission.
  • bit When the bit is a preset value, it indicates that the data transmitted before is not translated, and when the bit is inverted, it indicates that the new data is transmitted.
  • NDI when NDI is non-zero, it indicates that the data is not previously translated, and when NDI is 0, it indicates that the new data is transmitted; or, when NDI is 0, it indicates that the transmission is before There is no data translated, and when NDI is non-zero, it means that the new data is transmitted.
  • the base station sends a downlink data on the physical downlink shared channel (English short name: PDSCH) at time 0.
  • PDSCH physical downlink shared channel
  • the physical uplink control channel (PUCCH) feeds back the last transmitted NACK information to the base station, and the base station demodulates and processes the NACK information in the PUCCH, and then retransmits the data according to the downlink resource allocation situation. Scheduling, the scheduling time at this time is not specified, the base station schedules according to the situation. It is assumed that the retransmission is sent on the PDSCH at time 6. If the UE successfully decodes at this time, it sends an ACK at time 10, then a transmission is performed. ended.
  • PUCCH physical uplink control channel
  • redundancy version (English full name: redundancy version, English abbreviation: RV)
  • the MAC protocol data unit (English name: protocol data unit, English abbreviation: PDU) needs to be retransmitted, regardless of the amount of error, the physical layer should be correctly translated in the LTE network architecture.
  • the code resource has a bit error, and the physical layer will not deliver it upwards. Therefore, regardless of the number of wrong bits, it is fed back to the sender, and the sender retransmits the redundancy of the error data.
  • RV is designed to implement incremental redundancy (English full name: incremental redundancy, English abbreviation: IR) HARQ transmission, that is, the redundant bits generated by the encoder are divided into several groups, each RV has an initial position (also known as: transmission start Point), the first transmission and each HARQ retransmission use different RVs respectively to realize the gradual accumulation of redundant bits and complete the IR HARQ operation.
  • IR incremental redundancy
  • two RV numbers were considered: 4 and 8, after discussion, 4 RVs were determined.
  • the definition of RV is related to the size of the soft buffer. The smaller of the sender-side loop buffer and the receiver-side soft buffer is selected, and the four RVs are evenly distributed within this range.
  • FIG. 3 is a schematic diagram of RV for a certain transport block.
  • a circle formed by a circumference of radius r1 and a circle of radius r2 is filled with two parts, one part is a systematic bit, and one part is a parity bit, because one is encoded.
  • RV RV0 (assumed to be the first transmission)
  • the transmitting end is notified to perform the first retransmission (assumed to be RV1), which will transmit more. More new redundant bits.
  • the last failed data receiving end is not discarded, but is further decoded in combination with the retransmitted new redundant bits.
  • the existing HARQ mechanism fills the retransmitted data with the currently available physical resources during retransmission, which is characterized by a large amount of delay-insensitive service data, which causes excessive redundancy in transmission. Information also leads to waste of physical resources and reduces resource utilization.
  • the embodiment of the present invention provides a method, an apparatus, and a system for performing the HARQ transmission.
  • the technical solution in the embodiment of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.
  • a component can be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread in execution, a program, and/or a computer.
  • an application running on a computing device and the computing device can be a component.
  • One or more components can reside within a process and/or thread of execution, and a component can be located in a computer and/or distributed between two or more computers.
  • the pieces can be executed from a variety of computer readable media having various data structures thereon.
  • These components may be passed, for example, by having one or more data packets (eg, data from one component that interacts with the local system, another component of the distributed system, and/or signaled through, such as the Internet)
  • the network interacts with other systems to communicate in a local and/or remote process.
  • a wireless communication network is a network that provides wireless communication functions.
  • the wireless communication network can adopt different communication technologies, such as code division multiple access (English name: CDMA), wideband code division multiple access (English name: wideband code division multiple access, English abbreviation: WCDMA) Time division multiple access (English full name: time division multiple access, English abbreviation: TDMA), frequency division multiple access (English full name: frequency division multiple access, English abbreviation: FDMA), orthogonal frequency division multiple access (English: orthogonal frequency- Division multiple access, English abbreviation: OFDMA), single carrier frequency division multiple access (English full name: single carrier FDMA, English abbreviation: SC-FDMA), carrier sense multiple access / collision avoidance (English full name: carrier sense multiple access with Collision avoidance).
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • TDMA Time division multiple access
  • TDMA Time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • the network can be divided into 2G (English: generation) network, 3G network or 4G network.
  • a typical 2G network includes a global mobile communication system (global system for mobile communications/general packet radio service, English abbreviation: GSM) network or a general packet radio service (English name: general packet radio service, English abbreviation: GPRS) network.
  • GSM global system for mobile communications/general packet radio service
  • GPRS general packet radio service
  • a typical 3G network includes a universal mobile telecommunications system (English name: UMTS) network.
  • a typical 4G network includes an LTE network.
  • the UMTS network can also be called the universal terrestrial radio access network (English full name: UTRAN), and the LTE network can sometimes also be called the evolved universal terrestrial radio access network (English full name: Evolved universal terrestrial radio access network, English abbreviation: E-UTRAN).
  • E-UTRAN evolved universal terrestrial radio access network
  • it can be divided into cellular communication network and wireless local area network (English full name: wireless local area Networks, English abbreviation: WLAN), in which the cellular communication network is dominated by scheduling, and WLAN is dominant.
  • the aforementioned 2G, 3G and 4G networks are all cellular communication networks.
  • the embodiments of the present invention are equally applicable to other wireless communication networks, such as 4.5G or 5G networks, or other non-cellular communication networks.
  • the embodiment of the present invention sometimes abbreviates the wireless communication network into a network.
  • a UE is a terminal device, which may be a mobile terminal device or a non-mobile terminal device.
  • the device is mainly used to receive or send business data.
  • User equipment can be distributed in the network. User equipments have different names in different networks, such as: terminals, mobile stations, subscriber units, stations, cellular phones, personal digital assistants, wireless modems, wireless communication devices, handheld devices, knees. Upper computer, cordless phone, wireless local loop station, etc.
  • the user equipment can communicate with one or more core networks via a radio access network (radio access network, English abbreviation: RAN) (for accessing a wireless communication network), for example, exchanging voice and voice with a radio access network. / or data.
  • radio access network radio access network, English abbreviation: RAN
  • RAN for accessing a wireless communication network
  • a base station device also referred to as a base station, is a device deployed in a wireless access network to provide wireless communication functionality.
  • a device that provides a base station function in a 2G network includes a base transceiver station (English name: base transceiver station, English abbreviation: BTS) and a base station controller (English name: base station controller, English abbreviation: BSC), which is provided in a 3G network.
  • the base station function includes the Node B (English name: NodeB) and the radio network controller (English name: radio network controller, English abbreviation: RNC).
  • the device that provides the base station function in the 4G network includes the evolved Node B (English full name: Evolved NodeB, English abbreviation: eNB), in the WLAN, the device that provides the function of the base station is the access point (English full name: access point, English abbreviation: AP).
  • eNB evolved Node B
  • AP access point
  • a wireless network device which may be a base station, which may be used to communicate with one or more user devices, or may be used with one or more functions having partial user devices.
  • the base station performs communication (such as communication between the macro base station and the micro base station, such as an access point);
  • the wireless network device can also be a user equipment, and the user equipment can be used for communication by one or more user equipments (such as device to device) (English full name: Device-to-device (abbreviation: D2D) communication can also be used to communicate with one or more base stations.
  • D2D Device-to-device
  • User equipment may also be referred to as user terminals and may include systems, subscriber units, subscriber stations, mobile stations, mobile wireless terminals, mobile devices, nodes, devices, remote stations, remote terminals, terminals, wireless communication devices, wireless communication devices, or Some or all of the features of the user agent.
  • the user equipment can be a cellular phone, a cordless phone, a session initiation protocol (English name: session initiation protocol, English abbreviation: SIP), a smart phone, a wireless local loop (English name: wireless local loop, English abbreviation: WLL) station, Personal digital assistant (English full name: personal digital assistant: PDA), laptop computer, handheld communication device, handheld computing device, satellite wireless device, wireless modem card and / or used for communication on wireless systems Other processing equipment.
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA Personal digital assistant
  • a base station may also be referred to as an access point, a node, a Node B, an evolved Node B, or some other network entity, and may include some or all of the functions of the above network entities.
  • the base station can communicate with the wireless terminal over the air interface. This communication can be done by one or more sectors.
  • the base station can be used as a router between the wireless terminal and the rest of the access network by converting the received air interface frame into an internet protocol (English full name: internet protocol: IP) packet, wherein the access
  • the network includes an IP network.
  • the base station can also coordinate the management of air interface attributes and can also be a gateway between the wired network and the wireless network.
  • the application will present various aspects, embodiments, or features in a system that can include multiple devices, components, modules, and the like. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules, etc. discussed in connection with the figures. In addition, a combination of these schemes can also be used.
  • the words “exemplary” and “such as” are used to mean an example, an illustration, or a description. Any embodiment or design described as “exemplary” or “such as” in this application should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of the words “example”, “such as” is intended to present the concept in a specific manner.
  • information (information), signal (in English: signal), message (in English: message), and channel (English: channel) may sometimes be mixed, and should be referred to What is out is that when the difference is not emphasized, the meaning to be expressed is the same. "(English: of)”, “corresponding (relevant)” and “corresponding” can sometimes be mixed. It should be noted that when the difference is not emphasized, what is to be expressed The meaning is the same.
  • the network architecture and the service scenario described in the embodiments of the present invention are used to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation of the technical solutions provided by the embodiments of the present invention.
  • the technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.
  • the embodiment of the present invention is described in the context of a 4G network in a wireless communication network. It should be noted that the solution in the embodiment of the present invention may also be applied to other wireless communication networks, and the corresponding names may also be used in other wireless communication networks. Replace the name of the corresponding function.
  • FIG. 4 it is a schematic diagram of a system architecture based on HARQ transmission applicable to an embodiment of the present invention.
  • the system based on HARQ transmission includes: a base station, and multiple UEs in a cell managed by the base station.
  • the base station can separately communicate with each of the multiple UEs.
  • the embodiment of the present invention provides a method for performing HARQ transmission, and the interaction between the base station and the UE1 is taken as an example.
  • the UE1 is any UE in the cell managed by the base station. .
  • the method includes:
  • the base station performs physical layer framing to obtain a physical layer frame, where the physical layer frame includes a redundancy version of each of the M codewords to be retransmitted and/or a codeword of the first new data.
  • the codeword of the first new data is obtained by the base station after performing error estimation coding (English full name: error estimating coding, English abbreviation: EEC), and then performing channel coding, and the code of the first new data is obtained.
  • EEC error estimation coding
  • the word is used to fill the remaining resources of the currently available physical resources except for the resources occupied by the redundancy versions of the M codewords that need to be retransmitted, and M is a positive integer not less than 1.
  • the base station modulates the physical layer frame.
  • the base station sends the modulated physical layer frame to the UE1.
  • the UE1 receives a physical layer frame sent by the base station.
  • the UE1 demodulates the physical layer frame to obtain a demodulated physical layer frame.
  • the UE1 performs data separation on the demodulated physical layer frame, and obtains a redundancy version of each of the M codewords to be retransmitted and/or a codeword of the first new transmission data.
  • the UE1 performs channel decoding on each of the M codewords that need to be retransmitted according to respective redundancy versions of the M codewords that need to be retransmitted. And the error position estimation check, and obtain the corresponding error position estimation check result.
  • the UE1 performs channel decoding and error location estimation verification on the codeword of the first new transmission data, and obtains a corresponding error position estimation verification result.
  • the UE1 needs to be heavy according to the redundancy versions of the M codewords that need to be retransmitted.
  • the transmitted codeword performs channel decoding and error position estimation check respectively, obtains a corresponding error position estimation check result, and UE1 performs channel decoding and error position estimation check on the codeword of the first new data, and obtains a corresponding correspondence.
  • the error location estimates the verification result.
  • the UE1 sends the error location estimation verification result to the base station.
  • step S501 of the embodiment of the present invention
  • the physical layer frame includes a redundancy version of each of the M codewords to be retransmitted and/or a codeword of the first new data.
  • the physical layer frame includes M codewords that need to be retransmitted. a redundancy version; or, the physical layer frame includes a codeword of the first new data; or the physical layer frame includes a redundancy version of each of the M codewords to be retransmitted and the first new data. Codeword.
  • the embodiment of the present invention does not specifically limit the specific transmission scenario.
  • performing error estimation coding on the first new transmission data is a key to the embodiment of the present invention.
  • An example of providing an error estimation coding method is as follows: first, performing CRC check on the first new transmission data, adding the obtained CRC check code to the first new transmission data, and then performing error estimation coding, that is, according to The n bits are grouped, the first new data is divided into several groups, each group is subjected to parity check, and the obtained check code is added to the back of the packet to obtain the error estimation code. result.
  • Turbo coding in LTE reuses two WCDMA/(English full name: high-speed packet access, English abbreviation: HSPA) 1/2 code rate, 8
  • the interleaver based on quadratic polynomial permutation (QPP) is used instead of the internal interleaver of the WCDMA/HSPA Turbo encoder used, which reduces the complexity of Turbo coding/decoding. degree.
  • one bit level scrambling is performed in the bit block of the HARQ transmission, and the interference signal is randomly allocated after the descrambling code is received at the receiving end, thereby ensuring the true use of the channel code. Processing gain.
  • the existing low-density parity check code (English name: LDPC) channel coding mode may be selected for channel coding, and the present invention may be referred to the existing implementation manner. The embodiments are not described herein again.
  • the embodiment of the present invention may also use other channel coding methods for channel coding, which is not specifically limited in this embodiment of the present invention.
  • steps S507a, S507b, and S507c of the embodiment of the present invention are identical to steps S507a, S507b, and S507c of the embodiment of the present invention.
  • the UE1 performs channel decoding and error position estimation check on the codeword of the first new transmission data and/or the codewords to be retransmitted respectively, and obtains the corresponding error position estimation verification result, and the error estimation verification result is obtained. Specifically, it can include the following three situations:
  • the verification has an error and the location of the error cannot be estimated.
  • this is related to the error estimation method, and the reasons for the inability to estimate the error location may include the following:
  • the EEC estimates that more than 25% of the packets are wrong. At this time, the low code rate is not good for encoding these packets, and the possibility of packet miss detection is greater; or,
  • the obtained physical layer frame includes the redundancy versions of the M codewords that need to be retransmitted and/or Or a codeword of the first new data, where the codeword of the first new data is used to fill the resources of the currently available physical resources except for the redundancy versions of the M codewords that need to be retransmitted.
  • Redundant information when the redundancy versions of the M codewords that need to be retransmitted are not filled with the currently available physical resources, the codewords of the newly transmitted data are used to fill the currently available physical resources, except for the M.
  • the remaining resources other than the resources occupied by the respective redundant versions of the transmitted codewords will reduce the transmission of redundant resources, thereby reducing the waste of physical resources and improving the utilization of resources.
  • the base station further performs error estimation coding on the first new transmission data, so that the UE may feedback the corresponding error position estimation verification result after performing error estimation verification, and may estimate the error when the error estimation verification is performed.
  • the method includes steps S601-S608:
  • the base station performs physical layer framing to obtain a physical layer frame, where the physical layer frame is Contains the codeword of the newly transmitted data 1.
  • the codeword of the newly transmitted data 1 is obtained by the base station performing error estimation coding on the newly transmitted data 1 and then performing channel coding.
  • the base station modulates a physical layer frame.
  • the base station sends the modulated physical layer frame to the UE1.
  • the UE1 receives a physical layer frame sent by the base station.
  • the UE1 demodulates the physical layer frame to obtain a demodulated physical layer frame.
  • the UE1 performs data separation on the demodulated physical layer frame to obtain a codeword of the newly transmitted data 1.
  • the UE1 performs channel decoding and error location estimation verification on the codeword of the newly transmitted data 1, and obtains a corresponding error position estimation verification result.
  • the UE1 sends an error location estimation verification result to the base station.
  • the embodiment of the present invention corresponds to the first transmission scenario of the MAC PDU. Therefore, in the S601, the physical layer frame only includes the codeword of the newly transmitted data 1.
  • the j+1th transmission scenario of the MAC PDU includes steps S701-S708:
  • the base station performs physical layer framing to obtain a physical layer frame, where the physical layer frame includes a redundancy version of each of the M codewords to be retransmitted and a codeword of the newly transmitted data 2.
  • the codeword of the newly transmitted data 2 is obtained by the base station after performing error estimation coding on the newly transmitted data 2, and then performing channel coding, and the codeword of the newly transmitted data 2 is used to fill the currently available physical resources except the M needs to be heavy.
  • the remaining resources other than the resources occupied by the respective redundancy versions of the transmitted codewords, M is a positive integer not less than one.
  • the base station modulates the physical layer frame.
  • the base station sends the modulated physical layer frame to the UE1.
  • the UE1 receives a physical layer frame sent by the base station.
  • the UE1 demodulates the physical layer frame to obtain a demodulated physical layer frame.
  • the UE1 performs data separation on the demodulated physical layer frame, and obtains a redundancy version of each of the M codewords to be retransmitted and a codeword of the newly transmitted data 2.
  • the UE1 performs channel decoding and error location estimation verification on the M codewords that need to be retransmitted according to respective redundancy versions of the codewords that need to be retransmitted, to obtain a corresponding error position estimation verification result; and The UE1 performs channel decoding and error position estimation check on the codeword of the newly transmitted data 2, and obtains a corresponding error position estimation verification result.
  • the UE1 sends an error location estimation verification result to the base station.
  • the physical layer frame since the data transmission of the jth time is incorrect, the physical layer frame includes a redundancy version of each of the M codewords to be retransmitted and a codeword of the newly transmitted data 2.
  • the “redundant version of the M codewords that need to be retransmitted” herein refers specifically to the data that needs to be retransmitted during the j+1th transmission of the MAC PDU.
  • steps S701-S708 may refer to the related description in the embodiment shown in FIG. 5, and details are not described herein again.
  • the j+1th transmission scenario of the MAC PDU may further include steps S801-S808. :
  • the base station performs physical layer framing to obtain a physical layer frame, where the physical layer frame includes a redundancy version of each of the M codewords that need to be retransmitted.
  • M is a positive integer not less than one.
  • the base station modulates a physical layer frame.
  • the base station sends the modulated physical layer frame to the UE1.
  • the UE1 receives a physical layer frame sent by the base station.
  • the UE1 demodulates the physical layer frame to obtain a demodulated physical layer frame.
  • the UE1 performs data separation on the demodulated physical layer frame to obtain a redundancy version of each of the M codewords that need to be retransmitted.
  • the UE1 performs the M versions according to the redundancy versions of the M codewords that need to be retransmitted.
  • the code words that need to be retransmitted are respectively subjected to channel decoding and error position estimation verification, and the corresponding error position estimation verification result is obtained.
  • the UE1 sends an error location estimation verification result to the base station.
  • the method may further include:
  • the base station receives an error location estimation verification result sent by the UE1.
  • the error location estimation verification result includes an error location estimation verification result obtained by the UE1 performing channel decoding and error location estimation verification on the S codewords that need to be retransmitted respectively; and/or, UE1 is for the newly transmitted data 3
  • the error correction estimation result obtained after the codeword performs channel decoding and error position estimation verification.
  • the error location estimation verification result may specifically include three situations as described in the foregoing embodiment shown in FIG. 5, and details are not described herein again.
  • the “redundant version of the codewords that need to be retransmitted” herein refers specifically to the data that needs to be retransmitted during the jth transmission of the MAC PDU.
  • the base station determines, according to the error location estimation check result, the data amount of each of the redundancy versions of the M codewords that need to be retransmitted.
  • the performing, by the base station, the physical layer framing, and obtaining the physical layer frame may specifically include:
  • the base station determines the available resources of the newly transmitted data 2 according to the data amount of the redundancy versions of the M codewords that need to be retransmitted, and then performs physical layer framing to obtain a physical layer frame.
  • the data amount of the current transmission is first determined according to a signal to noise ratio (English full name: signal noise ratio, English abbreviation: SNR). And then performing MAC layer framing according to the currently available physical resources and the data amount according to the redundancy version of each of the M codewords that need to be retransmitted.
  • SNR signal to noise ratio
  • the base station determines, according to the error estimation check result, that the data volume of each of the M versions of the codewords to be retransmitted is 1.3M, and the base station performs physical layer framing.
  • the physical layer frame contains the redundancy versions of the M codewords to be retransmitted and the codewords of the newly transmitted data.
  • the base station determines, according to the error estimation check result, that the data volume of each of the M versions of the codewords to be retransmitted is 2M, and the base station performs a physical layer framing
  • the physical layer frame contains only the redundancy versions of the M codewords that need to be retransmitted.
  • the base station determines, according to the error estimation check result, that the data volume of each of the M versions of the codewords that need to be retransmitted is 2.3M, and the base station performs the physical layer framing, because the data is retransmitted. If the amount is greater than the current physical resource, the current physical resource will be used to transmit the retransmitted data, and can only be used to transmit 2M retransmission data, and the remaining retransmission data will be transmitted in the next transmission process. Specifically limited. At this time, the physical layer frame contains only the redundancy versions of the M codewords that need to be retransmitted.
  • the base station performs the physical layer framing to obtain the physical layer frame, and specifically includes:
  • the base station performs physical layer framing according to the preset rule to obtain a physical layer frame
  • the preset rule includes:
  • the redundancy versions of the codewords that need to be retransmitted are in the front, and the codewords of the newly transmitted data are in the back. If M>1, the M codewords that need to be retransmitted are used.
  • the respective redundancy versions are sorted in the order in which the corresponding error data is transmitted.
  • the data structure of the physical layer frame in the embodiment of the present invention may be as shown in FIG.
  • the redundancy version of the codeword 1 the redundancy version of the codeword 2, ..., the redundancy version of the codeword M are sorted in the chronological order of the previous transmission.
  • the redundancy version of the mth codeword to be retransmitted in each of the M redundant versions of the codewords to be retransmitted includes at least the Km packets of the mth codeword to be retransmitted a redundancy version of the packet, K m is the m-th codeword the number of packets to be retransmitted, K m is a positive integer not less than 2.
  • the error estimation check result is as shown in the above case 2 (ie, the check has an error and the error can be estimated)
  • only the new redundancy of the error portion of the code word may be generated.
  • the remaining versions are retransmitted, which greatly reduces the amount of data retransmitted, reduces the waste of physical resources, and enables more new data to be transmitted on the current physical resources, thereby improving resource utilization.
  • the overall redundancy of a codeword specifically refers to the redundancy generated by the coding of the entire information bits of the codeword.
  • the current physical resources are limited, it is possible to transmit only a part of the retransmissions, which is not specifically limited in the embodiment of the present invention.
  • whether the transmitted codeword is a retransmission codeword can be indicated as follows:
  • the base station sends a retransmission data identifier (English full name: RTDI) to the UE1, and the RTDI is used to indicate whether each transmitted codeword is a retransmission codeword.
  • RTDI retransmission data identifier
  • the base station may use RTDI to indicate whether the transmitted codeword is a retransmission codeword on the control plane, and then the base station sends the RTDI to the UE1 through the PDCCH.
  • RTDI equal to 0 may be used to indicate that the codeword is a new codeword
  • RTDI is a non-zero real number to indicate that the codeword is a retransmitted codeword
  • RTDI equal to 0 may be used to indicate that the codeword is retransmitted.
  • the code word which is a non-zero real number, indicates that the code word is a new code word, which is not specifically limited in the embodiment of the present invention.
  • NACK indicates that the previously transmitted data has an error
  • ACK indicates that the previously transmitted data is correctly decoded
  • PDU 1 is the data transmitted for the first time.
  • the base station transmits PDU 1 with The body transmission details are as shown in the embodiment of FIG. 6, and are not described herein again.
  • UE1 feeds back a NACK of a PDU 1 when it finds an error, indicating that PDU 1 has an error message. After receiving this feedback, UE1 performs physical layer framing according to the procedure of the embodiment shown in FIG.
  • the error partial redundancy version RV1 (redundant version 1 of PDU 1) obtained according to the error position estimation check result is filled in before the PDU 2, and a new physical layer frame is formed and transmitted.
  • the same filled boxes represent information for the same codeword.
  • the base station After the second transmission, it is assumed that the codeword transmitted for the first time is still not translated, and a new error occurs in the codeword transmitted for the second time.
  • UE1 feeds back the two errors at the same time, that is, PDU 1NACK, PDU 2NACK, and after receiving the feedback, the base station performs physical layer framing according to the process of the embodiment shown in FIG. 9.
  • the new redundancy version RV2 of the error portion of the first transmitted codeword and the redundancy version RV1 of the error portion of the second transmitted codeword are filled in before the PDU 3 to form a new one.
  • the physical layer frame is sent.
  • the transmission time order of the new redundancy version RV2 of the error portion of the first transmitted codeword and the redundancy version RV1 of the error portion of the second transmitted codeword are sorted according to the time sequence of the previous codeword transmission. That is, the error part of the first transmitted code word is the new redundancy version RV2, and the redundancy version RV1 of the error part of the second transmission code word is after.
  • the physical layer frame sent by the base station to the UE1 includes a header header, and the RTDI is included in the header, and the RTDI is used to indicate whether each transmitted codeword is a retransmission codeword.
  • a header may be added in front of the physical layer frame according to the group of each transmitted codeword, and the RTDI is allocated in the header. Space, that is, the part of RTDI is placed on the user side, not on the control side. Since the header part of the data is very important, and the data part has been channel-encoded, it can be coded separately with a low bit rate to ensure correct transmission of the header part (this scheme uses 1/4 of the code rate).
  • the codeword may be indicated as a new codeword by using RTDI equal to 0, and the codeword may be a retransmitted codeword by using a real number whose RTDI is non-zero; of course, RTDI is equal to 0.
  • the codeword is instructed to be a retransmitted codeword, and the real number indicating that the codeword is non-zero is a new codeword, which is not specifically limited in this embodiment of the present invention.
  • NACK indicates that the previously transmitted data has an error
  • ACK indicates that the previously transmitted data is correctly decoded
  • PDU 1 is the data transmitted for the first time.
  • the embodiment shown in FIG. 6 is not described here.
  • UE1 feeds back a NACK of a PDU 1 when it finds an error, indicating that PDU 1 has an error message. After receiving this feedback, UE1 performs physical layer framing according to the procedure of the embodiment shown in FIG.
  • the equally filled boxes represent information for the same codeword.
  • the base station After the second transmission, it is assumed that the codeword transmitted for the first time is still not translated, and a new error occurs in the codeword transmitted for the second time.
  • UE1 feeds back the two errors at the same time, that is, PDU 1 NACK, PDU 2 NACK, and after receiving the feedback, the base station performs physical layer framing according to the process of the embodiment shown in FIG. 9 .
  • the new redundancy version RV2 of the error portion of the first transmitted codeword and the redundancy version RV1 of the error portion of the second transmitted codeword are filled in before the PDU 3 to form a new one.
  • the physical layer frame is sent.
  • the transmission time order of the new redundancy version RV2 of the error portion of the first transmitted codeword and the redundancy version RV1 of the error portion of the second transmitted codeword are sorted according to the time sequence of the previous codeword transmission. That is, the error part of the first transmitted code word is the new redundancy version RV2, and the redundancy version RV1 of the error part of the second transmission code word is after.
  • the RTDI of the HARQ is set to 3 bits, that is, the redundancy version of the error part of the 7 code words can be retransmitted in at most one retransmission, and the maximum number of segments accumulated in each transmission is 7 segments. Retransmit the data.
  • the experiment shows that, based on the HARQ transmission based method provided by the embodiment of the present invention, when the first transmission success rate is 84%, the probability of a retransmission success is 99.3%. This is a very high retransmission success rate.
  • the experiment shows that when retransmitting, there is a maximum of 4 pieces of retransmission data in one transmission, and the average number of times is slightly larger than 1.
  • FIG. 14 is a comparison diagram of retransmission times of the HARQ mechanism (abbreviated as the original HARQ scheme in FIG. 14) and the technical solution of the present invention (referred to as the new HARQ scheme in FIG. 14) in the existing LTE. It is assumed that the retransmission of the two schemes is 100-bit redundancy. As can be seen from FIG. 14, the technical solution of the present invention can effectively control the increase of the number of retransmissions. Since the technical solution of the present invention effectively reduces the amount of data retransmitted in the HARQ mechanism, it can effectively save physical resources and improve resource utilization.
  • FIG. 15 is a diagram showing the number of decoded frames and the transmission symbol
  • FIG. 16 is a peak signal to noise ratio (PSNR) and a transmission symbol performance map.
  • the original schemes in FIG. 15 and FIG. 16 correspond to the existing HARQ mechanism in the LTE
  • the enhancement scheme 0 corresponds to the case where the redundant error location is not considered in the technical solution of the present invention, and all the redundancy is retransmitted; In the technical solution of the present invention, the redundant error location is considered, and only the case of erroneous packet redundancy can be transmitted.
  • the enhancement scheme 1 is in the transmission phase with respect to the enhancement scheme 0.
  • the performance can be improved.
  • the method for the HARQ transmission when the base station performs physical layer framing, the obtained physical layer frame includes redundancy of M codewords that need to be retransmitted. a codeword of the version and/or the first new data, wherein the codeword of the first new data is used to fill a redundancy version of each of the currently available physical resources except the M codewords that need to be retransmitted The remaining resources beyond the resources. That is to say, unlike in the prior art, the retransmission data occupies all the resources scheduled for the UE next time, that is, the data to be retransmitted needs to fill the currently available physical resources during retransmission, thereby causing excessive transmission.
  • Redundant information when the redundancy versions of the M codewords that need to be retransmitted are not filled with the currently available physical resources, the codewords of the newly transmitted data are used to fill the currently available physical resources, except for the M.
  • the remaining resources other than the resources occupied by the respective redundant versions of the transmitted codewords will reduce the transmission of redundant resources, thereby reducing the waste of physical resources and improving the utilization of resources.
  • the base station further performs error estimation coding on the first new transmission data, so that the UE may feedback the corresponding error position estimation verification result after performing error estimation verification, and may estimate the error when the error estimation verification is performed.
  • an embodiment of the present invention provides a device based on HARQ transmission, which may be a base station 170, configured to perform the steps performed by a base station in the HARQ transmission-based method shown in FIG. 5 to FIG. 9 above.
  • the base station 170 may include a unit corresponding to the corresponding step.
  • the processing unit 1701 and the sending unit 1702 may be included.
  • the processing unit 1701 is configured to perform physical layer framing to obtain a physical layer frame, where the physical layer frame includes a redundancy version of each of the M codewords to be retransmitted and/or a first new data transmission.
  • a codeword the codeword of the first new data is obtained by the base station 170 performing error estimation coding on the first new data, and then performing channel coding, where the codeword of the first new data is used for Filling in the redundancy of each of the currently available physical resources except the M codewords that need to be retransmitted
  • M is a positive integer not less than 1.
  • the processing unit 1701 is further configured to modulate the physical layer frame.
  • the sending unit 1702 is configured to send the modulated physical layer frame to the UE.
  • processing unit 1701 is specifically configured to:
  • Performing physical layer framing according to a preset rule to obtain a physical layer frame where the preset rules include:
  • the redundancy versions of the codewords that need to be retransmitted are in the front, and the codewords of the newly transmitted data are in the back. If M>1, the M codewords that need to be retransmitted are used.
  • the respective redundancy versions are sorted in the order in which the corresponding error data is transmitted.
  • the sending unit 1702 is further configured to send an RTDI to the UE, where the RTDI is used to indicate whether each transmitted codeword is a retransmission codeword.
  • the physical layer frame includes a header header, where the header includes a retransmission data identifier RTDI, and the RTDI is used to indicate whether each transmitted codeword is a retransmission codeword.
  • RTDI retransmission data identifier
  • the base station 170 further includes a receiving unit 1703.
  • the receiving unit 1703 is configured to: if the physical layer frame includes a redundancy version of each of the M codewords that need to be retransmitted, perform physical layer framing in the framing unit, and receive the physical layer frame before receiving An error location estimation check result sent by the UE, where the error location estimation check result includes an error location estimate obtained by the UE after performing channel decoding and error location estimation verification on S codewords that need to be retransmitted respectively a check result; and/or an error position estimation check result obtained by the UE performing channel decoding and error position estimation check on the codeword of the second new data, S is a positive integer not less than 1.
  • the processing unit 1701 is further configured to: if the error location estimation check result indicates that the check has an error, determine, according to the error location estimation check result, a data amount of each of the redundant versions of the codewords that need to be retransmitted .
  • the processing unit 1701 is specifically configured to:
  • the redundancy version of the mth codeword that needs to be retransmitted in the redundancy version of each of the M codewords that need to be retransmitted includes Km packets of the mth codeword that needs to be retransmitted at least one redundancy version of the packet, K m is the number of the m-th packet to be retransmitted codeword, K m is a positive integer not less than 2.
  • the base station 170 in the embodiment of the present invention may correspond to the base station in the HARQ transmission based method shown in FIG. 5 to FIG. 9 above, and the division and/or function of each unit in the base station 170 in the embodiment of the present invention.
  • the flow of the method based on the HARQ transmission shown in FIG. 5 to FIG. 9 is implemented, and is not described here for brevity.
  • the base station 170 in the embodiment of the present invention may be used to perform the foregoing method, and therefore, the technical effects that can be obtained are also referred to the foregoing method embodiments, and details are not described herein again.
  • an embodiment of the present invention provides a device based on HARQ transmission, which may be a UE 190, configured to perform the steps performed by a base station in the HARQ transmission based method shown in FIG. 5 to FIG. 9 above.
  • the UE 190 may include a unit corresponding to the corresponding step.
  • the receiving unit 1901, the processing unit 1902, and the sending unit 1903 may be included.
  • the receiving unit 1901 is configured to receive a physical layer frame sent by the base station, where the physical layer frame includes a redundancy version of each of the M codewords to be retransmitted and/or a codeword of the first new data.
  • the codeword of the first new transmission data is obtained by performing error coding on the first new transmission data by the base station, and then performing channel coding, where the codeword of the first new transmission data is used to fill the currently available physical resources.
  • M is a positive integer not less than 1 except for the remaining resources other than the resources occupied by the redundant versions of the M codewords that need to be retransmitted.
  • the processing unit 1902 is configured to demodulate the physical layer frame, obtain a demodulated physical layer frame, and perform data separation on the demodulated physical layer frame to obtain the M required retransmissions.
  • the respective redundancy version of the codeword and/or the codeword of the first new transmitted data is configured to demodulate the physical layer frame, obtain a demodulated physical layer frame, and perform data separation on the demodulated physical layer frame to obtain the M required retransmissions.
  • the processing unit 1902 is further configured to: if the physical layer frame includes a redundancy version of each of the M codewords that need to be retransmitted, according to a redundancy version of each of the M codewords that need to be retransmitted M codewords that need to be retransmitted are respectively subjected to channel decoding and error position estimation and verification. Corresponding error location estimation verification result; and, if the physical layer frame includes the codeword of the first new transmission data, performing channel decoding and error location estimation on the codeword of the first new transmission data Check, obtain the corresponding error position estimation verification result.
  • the sending unit 1903 is configured to send the error location estimation verification result to the base station.
  • the redundancy version of the mth codeword that needs to be retransmitted in the redundancy version of each of the M codewords that need to be retransmitted includes Km packets of the mth codeword that needs to be retransmitted at least one redundancy version of the packet, K m is the number of the m-th packet to be retransmitted codeword, K m is a positive integer not less than 2.
  • the receiving unit 1901 is further configured to receive an RTDI sent by the base station, where the RTDI is used to indicate whether each transmitted codeword is a retransmission codeword.
  • the physical layer frame includes a header header, where the header includes a retransmission data identifier RTDI, and the RTDI is used to indicate whether each transmitted codeword is a retransmission codeword.
  • RTDI retransmission data identifier
  • the UE 190 in the embodiment of the present invention may correspond to the UE 190 in the HARQ transmission-based method shown in the foregoing FIG. 5 to FIG. 9 , and the division and/or function of each unit in the UE 190 in the embodiment of the present invention are In order to implement the method flow of the HARQ transmission based on the foregoing FIG. 5 to FIG. 9 , for brevity, details are not described herein again.
  • the UE 190 in the embodiment of the present invention may be used to perform the foregoing method, and therefore, the technical effects that can be obtained are also referred to the foregoing method embodiments, and details are not described herein again.
  • an embodiment of the present invention provides a device based on HARQ transmission, which may be a base station 200, including: a processor 2001, a memory 2002, a bus 2003, and a communication interface 2004.
  • the memory 2002 is used to store computer execution instructions
  • the processor 2001 is connected to the memory 2002 via a bus, and when the base station 200 is running, the processor 2001 executes computer execution instructions stored in the memory 2002 to cause the base station 200 to perform the operations as shown in FIGS. 5 to 9.
  • the method of transmission For a specific method based on the HARQ transmission, refer to the related description in the foregoing embodiment shown in FIG. 5 to FIG. 9 , and details are not described herein again.
  • the processor 2001 in the embodiment of the present invention may be a central processing unit (English name: central processing unit, English abbreviation: CPU), and may also be other general-purpose processors and digital signal processors (English full name: digital signal processing) , English abbreviation: DSP), ASIC (English full name: application specific integrated circuit, English abbreviation: ASIC), field programmable gate array (English full name: field-programmable gate array, English abbreviation: FPGA) or other programmable logic Devices, discrete gates or transistor logic devices, discrete hardware components, etc.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the processor may also be a dedicated processor, which may include at least one of a baseband processing chip, a radio frequency processing chip, and the like. Further, the dedicated processor may also include a chip having other dedicated processing functions of the base station 200.
  • the memory 2002 may include a volatile memory (English: volatile memory), such as a random access memory (English name: random-access memory, English abbreviation: RAM); the memory 2002 may also include a non-volatile memory (English: non- Volatile memory), such as read-only memory (English full name: read-only memory, English abbreviation: ROM), flash memory (English: flash memory), hard disk (English full name: hard disk drive, English abbreviation: HDD) or solid state drive (English full name: solid-state drive, English abbreviation: SSD); in addition, the memory 2002 may also include a combination of the above types of memory.
  • a volatile memory such as a random access memory (English name: random-access memory, English abbreviation: RAM)
  • non-volatile memory English: non- Volatile memory
  • read-only memory English full name: read-only memory, English abbreviation: ROM
  • flash memory English: flash memory
  • hard disk English full name: hard disk drive, English abbreviation: HDD
  • the bus 2003 can include a data bus, a power bus, a control bus, and a signal status bus.
  • various buses are illustrated as the bus 2003 in FIG.
  • Communication interface 2004 may specifically be a transceiver on base station 200.
  • the transceiver can be a wireless transceiver.
  • the wireless transceiver can be an antenna of the base station 200 or the like.
  • the processor 2001 performs data transmission and reception with other devices, such as the UE, through the communication interface 2004.
  • each step in the method flow shown in FIG. 5 to FIG. 9 above The computer executed instruction execution in the form of software stored in the memory 2002 can be implemented by the processor 2001 in hardware form. To avoid repetition, we will not repeat them here.
  • the base station 200 provided by the embodiment of the present invention can be used to perform the foregoing method, and the technical effects that can be obtained by reference to the foregoing method embodiments are not described herein.
  • an embodiment of the present invention provides a device based on HARQ transmission, which may be a UE 210, including: a processor 2101, a memory 2102, a bus 2103, and a communication interface 2104.
  • the memory 2102 is configured to store computer execution instructions
  • the processor 2101 is connected to the memory 2102 via a bus
  • the processor 2101 executes computer execution instructions stored in the memory 2103 to cause the UE 210 to perform the operations as shown in FIGS. 5 to 9.
  • a method based on HARQ transmission For a specific method based on the HARQ transmission, refer to the related description in the foregoing embodiment shown in FIG. 5 to FIG. 9 , and details are not described herein again.
  • the processor 2101 in the embodiment of the present invention may be a CPU, and may also be other general-purpose processors, DSPs, ASICs, FPGAs, or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and the like.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the processor may also be a dedicated processor, which may include at least one of a baseband processing chip, a radio frequency processing chip, and the like. Further, the dedicated processor may also include a chip having other dedicated processing functions of the UE 210.
  • the memory 2102 may include a volatile memory (English: volatile memory), such as a RAM; the memory 2102 may also include a non-volatile memory (English: non-volatile memory), such as a ROM, a flash memory (English: flash memory), The HDD or SSD; in addition, the memory 2102 may also include a combination of the above types of memories.
  • a volatile memory such as a RAM
  • the memory 2102 may also include a non-volatile memory (English: non-volatile memory), such as a ROM, a flash memory (English: flash memory),
  • the HDD or SSD in addition, the memory 2102 may also include a combination of the above types of memories.
  • the bus 2103 can include a data bus, a power bus, a control bus, and a signal status bus. For the sake of clarity in the present embodiment, various buses are illustrated as a bus 2103 in FIG.
  • Communication interface 2104 may specifically be a transceiver on UE 210.
  • the transceiver can be a wireless transceiver.
  • the wireless transceiver can be an antenna or the like of the UE 210.
  • Processor 2101 pass Data is transmitted and received between the communication interface 2104 and other devices, such as a base station.
  • each step in the method flow shown in FIG. 5 to FIG. 9 above may be implemented by the processor 2101 in hardware form executing a computer-executed instruction in the form of software stored in the memory 2102. To avoid repetition, we will not repeat them here.
  • the UE 210 provided by the embodiment of the present invention can be used to perform the foregoing method, and therefore, the technical effects that can be obtained by reference to the foregoing method embodiments are not described herein.
  • the embodiment further provides a readable medium, including computer execution instructions, when the processor of the base station executes the computer to execute the instruction, the base station may perform the HARQ transmission-based method as shown in FIG. 5 to FIG. .
  • a specific method based on the HARQ transmission refer to the related description in the foregoing embodiment shown in FIG. 5 to FIG. 9 , and details are not described herein again.
  • the embodiment further provides a readable medium, including computer execution instructions, when the processor of the UE executes the computer to execute the instruction, the UE may perform the HARQ transmission-based method as shown in FIG. 5 to FIG. .
  • a specific method based on the HARQ transmission refer to the related description in the foregoing embodiment shown in FIG. 5 to FIG. 9 , and details are not described herein again.
  • the above described device is only illustrated by the division of the above functional modules. In practical applications, the above functions may be assigned differently according to needs.
  • the function module is completed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.
  • the device and the unit described above refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the modules or units is only a logical function division.
  • there may be another division manner for example, multiple units or components may be used. Combinations can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, and the like, which can store a program code.

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Abstract

Conformément à des modes de réalisation, la présente invention concerne un procédé, un dispositif et un système de transmission sur la base d'une demande de répétition automatique hybride (HARQ), pour au moins résoudre le problème dans le mécanisme HARQ existant selon lequel une retransmission nécessite de remplir les ressources physiques actuellement disponibles avec des données retransmises, ce qui amènera, en ce qui concerne les services non sensibles au retard qui ont la caractéristique d'une grande quantité de données, des informations trop redondantes à être transmises, entraînant un gaspillage des ressources physiques. Le procédé comprend les opérations suivantes : une station de base réalise un tramage de couche physique pour obtenir des trames de couche physique, les trames de couche physique comprenant les versions redondantes respectives de M mots de code qui doivent être retransmis et/ou les mots de code de premières données nouvellement transmises, les mots de code des premières données nouvellement transmises étant obtenus au moyen de la réalisation, par la station de base, d'un codage par estimation d'erreur, puis au moyen de la réalisation, par la station de base, d'un codage de canal au niveau des premières données nouvellement transmises, et les mots de code des premières données nouvellement transmises étant utilisés pour remplir les ressources restantes des ressources physiques actuellement disponibles à l'exception des ressources occupées par les versions redondantes respectives des M mots de code qui ont besoin d'être retransmis ; et la station de base module les trames de couche physique, et envoie à un équipement utilisateur (UE) les trames de couche physique modulées. La présente invention peut s'appliquer au domaine des communications sans fil.
PCT/CN2016/111113 2015-12-21 2016-12-20 Procédé, dispositif et système de transmission sur la base d'une demande de répétition automatique hybride (harq) WO2017107904A1 (fr)

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