WO2009154394A2 - Procédé pour exécuter une harq dans un système de radiocommunication - Google Patents

Procédé pour exécuter une harq dans un système de radiocommunication Download PDF

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WO2009154394A2
WO2009154394A2 PCT/KR2009/003224 KR2009003224W WO2009154394A2 WO 2009154394 A2 WO2009154394 A2 WO 2009154394A2 KR 2009003224 W KR2009003224 W KR 2009003224W WO 2009154394 A2 WO2009154394 A2 WO 2009154394A2
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data
frame
transmitted
base station
downlink
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PCT/KR2009/003224
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English (en)
Korean (ko)
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WO2009154394A3 (fr
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박형호
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엘지전자주식회사
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Priority to KR1020107022662A priority Critical patent/KR101140091B1/ko
Publication of WO2009154394A2 publication Critical patent/WO2009154394A2/fr
Publication of WO2009154394A3 publication Critical patent/WO2009154394A3/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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1848—Time-out mechanisms
    • 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]

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method for performing a hybrid automatic repeat request (HARQ) in a wireless communication system.
  • HARQ hybrid automatic repeat request
  • Error compensation techniques for securing communication reliability include a forward error correction (FEC) scheme and an automatic repeat request (ARQ) scheme.
  • FEC forward error correction
  • ARQ automatic repeat request
  • FEC forward error correction
  • ARQ automatic repeat request
  • errors are corrected through data retransmission, and there are a stop and wait (SAW), a go-back-N (GBN), and a selective repeat (SR) scheme.
  • SAW stop and wait
  • GBN go-back-N
  • SR selective repeat
  • the SAW method is a method of transmitting the next frame after checking whether the transmitted frame is correctly received.
  • the GBN method transmits N consecutive frames and retransmits all frames transmitted after the frame in which an error occurs if transmission is not successful.
  • the SR method selectively retransmits only a frame in which an error occurs.
  • the FEC method has a short time delay and does not require information to be exchanged between the transmitter and the receiver, but has a disadvantage in that the system efficiency is poor in a good channel environment.
  • ARQ method can improve the transmission reliability, but it has the disadvantage of incurring time delay and inferior system efficiency in poor channel environment.
  • HARQ hybrid automatic repeat request
  • the HARQ-type receiver basically attempts error correction on received data and determines whether to retransmit using an error detection code.
  • the error detection code may use a cyclic redundancy check (CRC).
  • CRC cyclic redundancy check
  • the receiver sends a non-acknowledgement (NACK) signal to the transmitter.
  • the transmitter receiving the NACK signal transmits appropriate retransmission data according to the HARQ mode.
  • the receiver receiving the retransmitted data improves the reception performance by combining and decoding the previous data and the retransmitted data.
  • the mode of HARQ may be classified into chase combining and incremental redundancy (IR).
  • Chase combining is a method of obtaining a signal-to-noise ratio (SNR) gain by combining with retransmitted data without discarding the data where an error is detected.
  • SNR signal-to-noise ratio
  • IR is a method in which additional redundant information is incrementally transmitted to retransmitted data, thereby reducing the burden of retransmission and obtaining a coding gain.
  • HARQ may be classified into adaptive HARQ and non-adaptive HARQ according to transmission attributes such as resource allocation, modulation technique, transport block size, and the like.
  • Adaptive HARQ is a method in which transmission attributes used for retransmission are changed in whole or in part compared to initial transmission according to a change in channel conditions.
  • Non-adaptive HARQ is a method of continuously using the transmission attribute used for the initial transmission regardless of the change in channel conditions.
  • HARQ may be classified into synchronous HARQ and asynchronous HARQ according to data retransmission timing.
  • the base station and the terminal knows the data retransmission time point (implicit).
  • the asynchronous HARQ since resources are allocated at random times for data retransmission, separate signaling for data retransmission is required.
  • An acknowledgment / non-acknowledgement (ACK / NACK) transmission time and a data retransmission time point may vary according to a ratio of a downlink region and an uplink region in a frame and a processing delay of a terminal / base station. Therefore, it is necessary to set the ACK / NACK transmission time and data retransmission time according to each case.
  • the technical problem to be solved by the present invention is to provide a method of performing HARQ.
  • a method of performing HARQ of a terminal may include receiving data from a base station and performing ACK / NACK on the data at a point in time passed from the time point at which the data is transmitted from the base station. And transmitting to the base station, wherein information about the predetermined period of time is shared between the base station and the terminal.
  • the information on the predetermined period may include at least one of the predetermined period and information for determining the predetermined period.
  • the information for determining the predetermined period includes at least one of a ratio of an uplink region and a downlink region in a time division duplex (TDD) frame, a processing delay of the terminal, a processing delay of the base station, and a time point at which the data is transmitted from the base station. There may be at least one.
  • TDD time division duplex
  • the method may further include receiving a control signal including information about the predetermined period from the base station.
  • the control signal may be transmitted through a super frame header.
  • the predetermined period according to the ratio of the uplink region and the downlink region in the TDD frame and the time point at which the data is transmitted may be as shown in the table below.
  • the predetermined period according to the ratio of the uplink region and the downlink region in the TDD frame and the time point at which the data is transmitted may be as shown in the following table.
  • a method for performing HARQ of a base station includes transmitting data to a terminal, receiving a non-acknowledgement (NACK) signal for the data transmission from the terminal, and transmitting the NACK signal. And retransmitting the data to the terminal at a time after a predetermined period of time has passed, wherein information about the predetermined period is shared between the base station and the terminal.
  • NACK non-acknowledgement
  • the predetermined period of time may be determined based on at least one of a ratio of an uplink region and a downlink region in a TDD frame, a processing delay of the terminal, a processing delay of the base station, and a time point at which the data is transmitted from the base station.
  • a terminal includes a radio frequency (RF) unit and a processor connected to the RF unit, wherein the processor receives data from a base station, and a predetermined period from a time point at which the data is transmitted from the base station The ACK / NACK for the data is transmitted to the base station at the last time, and the information about the predetermined period is shared between the base station and the terminal.
  • RF radio frequency
  • An efficient method of performing HARQ may be provided.
  • the waste of resources allocated for HARQ can be reduced.
  • it is possible to reduce the control signal overhead for performing the HARQ process it is possible to reduce the time delay (latency) according to the HARQ process.
  • 1 shows a wireless communication system.
  • FIG. 2 shows an example of a frame structure.
  • 3 is an exemplary diagram illustrating processing of an information block for performing HARQ.
  • FIG. 6 is a flowchart illustrating a method of performing HARQ according to an embodiment of the present invention.
  • FIG. 7 illustrates HARQ timing according to an embodiment of the present invention when the DL / UL ratio is 4: 4.
  • FIG. 10 illustrates HARQ timing according to another embodiment of the present invention when the DL / UL ratio is 5: 3.
  • 11 shows HARQ timing according to another embodiment of the present invention when the DL / UL ratio is 5: 3.
  • 13 and 14 illustrate HARQ timing according to an embodiment of the present invention when the DL / UL ratio is 6: 2.
  • 15 to 18 illustrate HARQ timing according to another embodiment of the present invention when the DL / UL ratio is 6: 2.
  • 19 shows HARQ timing according to another embodiment of the present invention when the DL / UL ratio is 6: 2.
  • 20 is a block diagram illustrating a transmitter and a receiver for transmitting and receiving data using a method of performing HARQ according to an embodiment of the present invention.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16e (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), and the like.
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
  • IEEE 802.16m is an evolution from IEEE 802.16e.
  • 1 shows a wireless communication system.
  • a wireless communication system includes at least one base station 20 (BS).
  • Each base station 20 provides a communication service for a particular geographic area (generally called a cell).
  • the cell can in turn be divided into a number of regions (called sectors).
  • the user equipment (UE) 10 may be fixed or mobile, and may include a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA), It may be called other terms such as a wireless modem and a handheld device.
  • the base station 20 generally refers to a fixed station communicating with the terminal 10, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point. have.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • downlink means communication from the base station to the terminal
  • uplink means communication from the terminal to the base station.
  • a transmitter may be part of a base station and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal and a receiver may be part of a base station.
  • FIG. 2 shows an example of a frame structure.
  • a superframe includes a superframe header and four frames (frames, F0, F1, F2, and F3).
  • the size of each superframe is 20ms and the size of each frame is illustrated as 5ms, but is not limited thereto.
  • the superframe header (SFH) may be disposed in the first subframe of the superframe and a common control channel may be allocated.
  • the common control channel is a channel used for transmitting control information that can be commonly used by all terminals in a cell, such as information on frames or system information of a superframe.
  • SFH is multiplexed by A-MAP (Advanced MAP) and TDM (Time Division Multiplexing).
  • A-MAP carries unicast service control information.
  • Unicast service control information includes user specific control information and non-user service control information.
  • the user specific control information is divided into assignment information, HARQ feedback information, and power control information, which may be transmitted in the allocation A-MAP, the HARQ feedback A-MAP, and the power control A-MAP, respectively.
  • One frame includes eight subframes (Subframe, SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7).
  • Each subframe may be used for uplink or downlink transmission.
  • the subframe may consist of 6 or 7 OFDM symbols, but this is only an example. Some of the OFDM symbols constituting the subframe may be idle symbols.
  • Time division duplexing (TDD) or frequency division duplexing (FDD) may be applied to the frame.
  • TDD Time division duplexing
  • FDD frequency division duplexing
  • each subframe is used in uplink or downlink at different times at the same frequency. That is, subframes in the TDD frame are divided into an uplink subframe and a downlink subframe in the time domain.
  • FDD frequency division duplexing
  • each subframe is used in uplink or downlink on different frequencies at the same time. That is, subframes in the FDD frame are divided into an uplink subframe and a downlink subframe in the frequency domain.
  • the subframe includes at least one frequency partition.
  • the frequency partition is composed of at least one Physical Resource Unit (PRU).
  • PRU Physical Resource Unit
  • the frequency partitions may include Localized PRUs and / or Distributed PRUs. Frequency partitioning may be used for other purposes such as Fractional Frequency Reuse (FFR) or Multicast and Broadcast Services (MBS).
  • FFR Fractional Frequency Reuse
  • MBS Multicast and Broadcast Services
  • a PRU is defined as a basic physical unit for resource allocation that includes a plurality of consecutive OFDM symbols and a plurality of consecutive subcarriers.
  • the number of OFDM symbols included in the PRU may be equal to the number of OFDM symbols included in one subframe. For example, when one subframe consists of 6 OFDM symbols, the PRU may be defined with 18 subcarriers and 6 OFDM symbols.
  • Logical Resource Units are basic logical units for distributed resource allocation and localized resource allocation. The LRU is defined by a plurality of OFDM symbols and a plurality of subcarriers and includes pilots used in a PRU. Thus, the appropriate number of subcarriers in one LRU depends on the number of pilots assigned.
  • DRUs Logical Distributed Resource Units
  • the DRU includes subcarrier groups distributed in one frequency partition.
  • the size of the DRU is equal to the size of the PRU.
  • the smallest unit that forms a DRU is one subcarrier.
  • Logical Contiguous Resource Units may be used to obtain frequency selective scheduling gains.
  • the CRU includes a local subcarrier group.
  • the size of the CRU is equal to the size of the PRU.
  • 3 is an exemplary diagram illustrating processing of an information block for performing HARQ.
  • the information block may be referred to as a Protocol Data Unit (PDU) of Medium Access Control (MAC).
  • PDU Protocol Data Unit
  • MAC Medium Access Control
  • the transport block appended with the CRC is divided into appropriate sizes for channel encoding. This is called code block segmentation.
  • the divided block is called a code block.
  • An encoder performs channel encoding on a code block and outputs an encoded packet.
  • the encoder can apply a turbo code, which is one of the error correction codes.
  • the turbo code is a structural code that includes information bits as structural bits. In the case of turbo codes with a code rate of 1/3, two parity bits are allocated to one structural bit.
  • LDPC low density parity check code
  • other convolutional codes as well as the error correction code.
  • the HARQ processor performs an HARQ mode (chase combined or IR) and an HARQ scheme (adaptive HARQ or non-adaptive HARQ) suitable for a retransmission environment in order to retransmit an errored packet.
  • HARQ mode chase combined or IR
  • HARQ scheme adaptive HARQ or non-adaptive HARQ
  • the channel interleaver disperses transmission errors according to channels by mixing encoded packets bit by bit.
  • a physical resource mapper converts interleaved encoded packets into data symbols and maps them to the data region.
  • an entire bit string of an encoded packet is called a mother codeword
  • a mother code generated by applying a turbo code has structural bits having a bit string having the same length as a code block. And at least one parity bit associated with it.
  • the mother code rate is 1 / R m and the size of the code block into the encoder is N EP
  • the length of the mother code is Rm N EP .
  • N EP is the number of bits input to the CTC turbo encoder, which is defined as the size of the encoded packet. Is a parameter.
  • N EP 2 ⁇ N. If the mother coding rate is 1/3, the mother code includes one structural bit and two parity bits.
  • a mother code is divided into a plurality of bit string blocks and transmitted in units of bit string blocks.
  • the size of the bit string block may be determined according to the modulation technique applied, resource allocation, and the like.
  • the modulation technique may be determined in various ways, such as binary-phase shift keying (BPSK), quadrature-phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), and 64 QAM.
  • the bit string block is indicated by a redundancy version (RV).
  • RV redundancy version
  • the first bitstream block containing structural bits is RV 0
  • the second bitstream block contiguous to the first bitstream block is RV 1
  • the third bitstream block contiguous to the second bitstream block is RV.
  • the fourth bit string block subsequent to the second and third bit string blocks is indicated by RV 3. At this time, if successive bit string blocks exceed the length of the mother code, the excess portion is cyclically transmitted.
  • the size of the bit string blocks of different RVs may be determined differently. For example, in non-adaptive HARQ, the bit string blocks of each RV may be set to the same size, and in adaptive HARQ, the bit string blocks of different RVs may be set to different sizes. One bit string block may be mapped and transmitted in one subframe, and bit string blocks of different RVs may be mapped and transmitted in different subframes.
  • TTI transmission time interval
  • RTT round trip time
  • the ACK / NACK transmission time and the data retransmission time may vary according to the ratio of uplink and downlink in a time division duplex (TDD) frame and processing delay of the terminal / base station.
  • TDD time division duplex
  • the HARQ timing may be set to minimize the wasted time resources without overlapping each other in the time domain.
  • a method of performing HARQ for this will be described. For convenience of explanation, it will be described based on the TDD frame. However, the present invention is not limited thereto, and the technical spirit of the present invention may be extended to the FDD frame.
  • FIG. 6 is a flowchart illustrating a method of performing HARQ according to an embodiment of the present invention.
  • the base station transmits downlink data to the terminal is illustrated, but is not limited thereto. Even when the terminal transmits uplink data to the base station, the technical idea of the present invention can be applied.
  • HARQ timing means ACK / NACK transmission time and / or data retransmission time.
  • the ACK / NACK transmission time point may be represented as a time taken from the data transmission time point to the ACK / NACK transmission time, and may be expressed as an ACK channel delay.
  • the data retransmission time point may be represented as a time taken to retransmit data from an initial transmission time point or a time taken to retransmit data from an ACK / NACK transmission time point, and may be expressed as a retransmission channel delay.
  • the ACK channel delay and / or retransmission channel delay may be in subframe units.
  • the HARQ timing may vary depending on a ratio of a downlink region and an uplink region in a frame (hereinafter, referred to as a DL / UL ratio), a processing delay between a base station and a terminal, and a data transmission time point.
  • the DL / UL ratio may be various ratios such as 4: 4, 5: 3, 6: 2, and the like.
  • the processing delay is the time taken to decode the received message. Accordingly, in downlink data transmission, a terminal receiving data from a base station can transmit ACK / NACK at least from the time point at which the processing delay of the terminal has passed. In addition, the base station receiving the NACK from the terminal can retransmit the data at least from the time point of the processing delay of the base station.
  • the processing delay of the base station and the terminal may be the same or different.
  • the base station and the terminal implicitly imply a relationship between the DL / UL ratio, the processing delay between the base station and the terminal, and the time of ACK / NACK transmission and / or data retransmission according to the data transmission time.
  • the base station can inform the terminal of the DL / UL ratio, processing delay between the base station and the terminal and the data transmission time.
  • the base station may directly inform the terminal of an ACK / NACK transmission time and / or a data retransmission time.
  • the base station and the terminal may share HARQ timing according to various embodiments.
  • the base station may inform the terminal of the DL / UL ratio, the processing delay between the base station and the terminal and the data transmission time, or the ACK / NACK transmission time and / or the data retransmission time to the terminal through a control channel or a broadcast channel.
  • the control channel may be located in the super frame header.
  • the base station transmits data to the terminal (S110), the terminal transmits ACK / NACK to the base station (S120). In this case, the terminal may transmit ACK / NACK according to the HARQ timing shared with the base station in step S100. If data retransmission is necessary, the base station may retransmit the data according to the HARQ timing shared with the terminal in step S100 (S130).
  • ACK / NACK transmission and data retransmission of each HARQ process are performed at a predetermined time point. Accordingly, all channels allocated for HARQ can be used without waste.
  • Embodiments described in the present specification are merely exemplary and are not limited thereto.
  • the description is based on the TDD frame, but this may also be applied to the FDD frame.
  • the technical idea of the present invention can be applied to the case of transmitting data in the uplink.
  • each of the terminal and the base station has a processing delay of at least 3 subframes. If one subframe is assumed to be 1 TTI, the processing delay of each of the terminal and the base station is 3 TTI.
  • SF (subframes) 0 to SF 3 are downlink subframes and SF 4 to SF 7 are uplink subframes in each frame.
  • RTT is 8 subframes.
  • RTT is 8 subframes.
  • RTT is 8 subframes.
  • RTT is 8 subframes.
  • the HARQ timing pattern may be the same as 8.
  • each of the terminal and the base station has a processing delay of at least 3 subframes. If one subframe is assumed to be 1 TTI, the processing delay of each of the terminal and the base station is 3 TTI.
  • SF 0 through SF 4 are downlink subframes
  • SF 5 through SF 7 are uplink subframes.
  • RTT is 9 subframes.
  • the fifth HARQ channel data is transmitted in downlink through SF 4 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 5 of frame n + 1. Since the processing delay of the terminal is three subframes, it takes three subframes for the terminal to decode the data received from the base station. Accordingly, a time point three subframes from SF 5 of the frame n + 1 is SF 0 of the frame n + 1, and the preceding uplink subframe is SF 5 of the frame n + 1. If data retransmission is needed, data retransmission is performed in downlink through SF 1 of frame n + 2. Accordingly, the RTT is 13 subframes.
  • the sixth HARQ channel data is transmitted in downlink through SF 0 of frame n + 1 and ACK / NACK is transmitted for the data in uplink through SF 6 of frame n + 1. If data retransmission is needed, data retransmission is performed in downlink through SF 2 of frame n + 2. Accordingly, the RTT is 10 subframes.
  • the base station has a processing delay of at least 3 subframes, and the terminal has a processing delay of at least 2 subframes. If one subframe is assumed to be 1 TTI, the processing delay of the base station is 3 TTI and the processing delay of the terminal is 2 TTI.
  • SF 0 through SF 4 are downlink subframes
  • SF 5 through SF 7 are uplink subframes.
  • the RTT is 16 subframes.
  • the second HARQ channel data is transmitted in downlink through SF 1 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 5 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 1 of frame n + 2. Accordingly, the RTT is 16 subframes.
  • the third HARQ channel data is transmitted in downlink through SF 2 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 6 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 2 of frame n + 2. Accordingly, the RTT is 16 subframes.
  • the fourth HARQ channel data is transmitted in downlink through SF 3 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 6 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 3 of frame n + 2. Accordingly, the RTT is 16 subframes.
  • the fifth HARQ channel data is transmitted in downlink through SF 4 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 7 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 54 of frame n + 2. Accordingly, the RTT is 16 subframes.
  • 11 shows HARQ timing according to another embodiment of the present invention when the DL / UL ratio is 5: 3. It is assumed that the base station has a processing delay of at least 2 subframes, and the terminal has a processing delay of at least 3 subframes. Assuming one subframe is 1 TTI, the processing delay of the base station is 2 TTIs, and the processing delay of the terminal is 3 TTIs.
  • SF 0 through SF 4 are downlink subframes
  • SF 5 through SF 7 are uplink subframes.
  • the RTT is 10 subframes.
  • the second HARQ channel data is transmitted in downlink through SF 1 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 5 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 3 of frame n + 1. Accordingly, the RTT is 10 subframes.
  • the third HARQ channel data is transmitted in downlink through SF 2 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 6 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 4 of frame n + 1. Accordingly, the RTT is 10 subframes.
  • the fourth HARQ channel data is transmitted in downlink through SF 3 of frame n, and ACK / NACK transmission of the data is performed in uplink through SF 7 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 0 of frame n + 2. Accordingly, the RTT is 13 subframes.
  • the fifth HARQ channel data is transmitted in downlink through SF 4 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 5 of frame n + 1. If data retransmission is needed, data retransmission is performed in downlink through SF 1 of frame n + 2. Accordingly, the RTT is 13 subframes.
  • the sixth HARQ channel data is transmitted in downlink through SF 0 of frame n + 1 and ACK / NACK is transmitted for the data in uplink through SF 6 of frame n + 1. If data retransmission is needed, data retransmission is performed in downlink through SF 2 of frame n + 2. Accordingly, the RTT is 10 subframes.
  • the seventh HARQ channel data is transmitted in downlink through SF 1 of frame n + 1 and ACK / NACK is transmitted for the data in uplink through SF 7 of frame n + 1. If data retransmission is needed, data retransmission is performed in downlink through SF 3 of frame n + 2. Accordingly, the RTT is 10 subframes.
  • the base station has a processing delay of at least 2 subframes
  • the terminal has a processing delay of at least 3 subframes. Assuming one subframe is 1 TTI, the processing delay of the base station is 2 TTIs, and the processing delay of the terminal is 3 TTIs.
  • SF 0 through SF 4 are downlink subframes
  • SF 5 through SF 7 are uplink subframes.
  • the RTT is 16 subframes.
  • ACK / NACK is transmitted for the data in uplink through SF 5 or SF 6 of frame n.
  • ACK / NACK may be transmitted through SF 5 or SF 6. If data retransmission is needed, data retransmission is performed in downlink through SF 1 of frame n + 2. Accordingly, the RTT is 16 subframes.
  • the third HARQ channel data is transmitted in downlink through SF 2 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 6 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 2 of frame n + 2. Accordingly, the RTT is 16 subframes.
  • the fourth HARQ channel data is transmitted in downlink through SF 3 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 7 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 3 of frame n + 2. Accordingly, the RTT is 16 subframes.
  • the RTT is 16 subframes.
  • 13 and 14 illustrate HARQ timing according to an embodiment of the present invention when the DL / UL ratio is 6: 2. It is assumed that each of the terminal and the base station has a processing delay of at least 3 subframes. If one subframe is assumed to be 1 TTI, the processing delay of each of the terminal and the base station is 3 TTI.
  • SF (subframe) 0 to SF 5 are downlink subframes
  • SF 6 and SF 7 are uplink subframes.
  • the RTT is 10 subframes.
  • the second HARQ channel data is transmitted in downlink through SF 1 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 6 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 3 of frame n + 1. Accordingly, the RTT is 10 subframes.
  • ACK / NACK is transmitted for the data in uplink through SF 7 of frame n.
  • the ACK / NACK transmission may be transmitted through SF 6 of frame n, which is 3 subframes after the downlink data transmission time.
  • ACK / NACK is transmitted through SF 7 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 4 of frame n + 1. Accordingly, the RTT is 10 subframes.
  • the fourth HARQ channel data is transmitted in downlink through SF 3 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 7 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 5 of frame n + 1. Accordingly, the RTT is 10 subframes.
  • ACK / NACK is transmitted for the data in uplink through SF 6 of frame n + 1. Since the processing delay of the terminal is three subframes, it takes three subframes for the terminal to decode the data received from the base station. Therefore, a time point 3 subframes from SF 4 of frame n is SF 0 of frame n + 1, and the most uplink subframe therefrom is SF 6 of frame n + 1. If data retransmission is needed, data retransmission is performed in downlink through SF 2 of frame n + 2. Accordingly, RTT is 14 subframes.
  • HARQ channel data is transmitted in downlink through SF 5 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 6 of frame n + 1. Since the processing delay of the terminal is three subframes, it takes three subframes for the terminal to decode the data received from the base station. Accordingly, a time point three subframes from SF 5 of frame n becomes SF 1 of frame n + 1, and the most uplink subframe therefrom is SF 6 of frame n + 1. If data retransmission is needed, data retransmission is performed in downlink through SF 3 of frame n + 2. Accordingly, RTT is 14 subframes.
  • ACK / NACK is transmitted for the data in uplink through SF 7 of frame n + 1. Since the processing delay of the UE is 3 subframes, ACK / NACK may be transmitted through SF 6 of frame n + 1. However, since SF 6 of frame n + 1 is used for ACK / NACK transmission in the fifth HARQ channel and the sixth HARQ channel, ACK / NACK is performed through SF 7 of frame n + 1 to distribute resources evenly. send. If data retransmission is needed, data retransmission is performed in downlink through SF 4 of frame n + 2. Accordingly, the RTT is 12 subframes.
  • ACK / NACK is transmitted for the data in uplink through SF 7 of frame n + 1. Since the processing delay of the UE is 3 subframes, ACK / NACK may be transmitted through SF 6 of frame n + 1. However, since SF 6 of frame n + 1 is used for ACK / NACK transmission in the fifth HARQ channel and the sixth HARQ channel, ACK / NACK is performed through SF 7 of frame n + 1 to distribute resources evenly. send. If data retransmission is needed, data retransmission is performed in downlink through SF 5 of frame n + 2. Accordingly, the RTT is 12 subframes.
  • 15 to 18 illustrate HARQ timing according to another embodiment of the present invention when the DL / UL ratio is 6: 2. It is assumed that the base station has a processing delay of at least 2 subframes, and the terminal has a processing delay of at least 3 subframes. Assuming one subframe is 1 TTI, the processing delay of the base station is 2 TTIs, and the processing delay of the terminal is 3 TTIs.
  • SF (subframe) 0 to SF 5 are downlink subframes
  • SF 6 and SF 7 are uplink subframes.
  • the RTT is 10 subframes.
  • the second HARQ channel data is transmitted in downlink through SF 1 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 6 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 3 of frame n + 1. Accordingly, the RTT is 10 subframes.
  • ACK / NACK is transmitted for the data in uplink through SF 7 of frame n.
  • the ACK / NACK transmission may be transmitted through SF 6 of frame n, which is 3 subframes after the downlink data transmission time.
  • ACK / NACK is transmitted through SF 7 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 4 of frame n + 1. Accordingly, the RTT is 10 subframes.
  • the fourth HARQ channel data is transmitted in downlink through SF 3 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 7 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 5 of frame n + 1. Accordingly, the RTT is 10 subframes.
  • ACK / NACK is transmitted for the data in uplink through SF 6 of frame n + 1. Since the processing delay of the terminal is three subframes, it takes three subframes for the terminal to decode the data received from the base station. Therefore, a time point 3 subframes from SF 4 of frame n is SF 0 of frame n + 1, and the most uplink subframe therefrom is SF 6 of frame n + 1. If data retransmission is needed, data retransmission is performed in downlink through SF 2 of frame n + 2. Accordingly, RTT is 14 subframes.
  • HARQ channel data is transmitted in downlink through SF 5 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 6 of frame n + 1. Since the processing delay of the terminal is three subframes, it takes three subframes for the terminal to decode the data received from the base station. Accordingly, a time point three subframes from SF 5 of frame n becomes SF 1 of frame n + 1, and the most uplink subframe therefrom is SF 6 of frame n + 1. If data retransmission is needed, data retransmission is performed in downlink through SF 3 of frame n + 2. Accordingly, RTT is 14 subframes.
  • ACK / NACK is transmitted for the data in uplink through SF 7 of frame n + 1. Since the processing delay of the UE is 3 subframes, ACK / NACK may be transmitted through SF 6 of frame n + 1. However, since SF 6 of frame n + 1 is used for ACK / NACK transmission in the fifth HARQ channel and the sixth HARQ channel, ACK / NACK is performed through SF 7 of frame n + 1 to distribute resources evenly. send. If data retransmission is needed, data retransmission is performed in downlink through SF 4 of frame n + 2. Accordingly, the RTT is 12 subframes.
  • ACK / NACK is transmitted for the data in uplink through SF 7 of frame n + 1. Since the processing delay of the UE is 3 subframes, ACK / NACK may be transmitted through SF 6 of frame n + 1. However, since SF 6 of frame n + 1 is used for ACK / NACK transmission in the fifth HARQ channel and the sixth HARQ channel, ACK / NACK is performed through SF 7 of frame n + 1 to distribute resources evenly. send. If data retransmission is needed, data retransmission is performed in downlink through SF 5 of frame n + 2. Accordingly, the RTT is 12 subframes.
  • the RTT is 13 subframes.
  • the RTT is 13 subframes.
  • 19 shows HARQ timing according to another embodiment of the present invention when the DL / UL ratio is 6: 2. It is assumed that the base station has a processing delay of at least 3 subframes, and the terminal has a processing delay of at least 2 subframes. If one subframe is assumed to be 1 TTI, the processing delay of the base station is 3 TTI and the processing delay of the terminal is 2 TTI.
  • SF (subframes) 0 to SF 5 are downlink subframes
  • SF 6 and SF 7 are uplink subframes in each frame.
  • the RTT is 16 subframes.
  • the second HARQ channel data is transmitted in downlink through SF 1 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 6 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 1 of frame n + 2. Accordingly, the RTT is 16 subframes.
  • the third HARQ channel data is transmitted in downlink through SF 2 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 6 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 2 of frame n + 2. Accordingly, the RTT is 16 subframes.
  • ACK / NACK transmission of the data is performed in uplink through SF 7 of frame n.
  • the ACK / NACK transmission may be transmitted through SF 6 of frame n, which is 2 subframes after the downlink data transmission time.
  • ACK / NACK is transmitted through SF 7 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 3 of frame n + 2. Accordingly, the RTT is 16 subframes.
  • the fifth HARQ channel data is transmitted in downlink through SF 4 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 7 of frame n. If data retransmission is needed, data retransmission is performed in downlink through SF 4 of frame n + 2. Accordingly, the RTT is 16 subframes.
  • the sixth HARQ channel data is transmitted in downlink through SF 5 of frame n, and ACK / NACK is transmitted for the data in uplink through SF 6 of frame n + 1. If data retransmission is needed, data retransmission is performed in downlink through SF 5 of frame n + 2. Accordingly, the RTT is 16 subframes.
  • Table 1 shows an ACK channel delay according to each DL / UL ratio and data transmission time when the processing delay of the UE is 3 subframes. If a subframe in which downlink data transmission occurs is called SF n, a subframe in which ACK / NACK transmission occurs is SF n + k. k is the number in the table. For example, if the DL / UL ratio is 4: 4 and downlink data transmission occurs in SF 0, ACK / NACK transmission may be interpreted as occurring in SF (0 + 4).
  • ACK / NACK transmission occurs in SF (4 + 10), that is, in the next frame SF 6 of the frame in which downlink data transmission occurs. It can be interpreted as.
  • Table 2 shows an ACK channel delay according to each DL / UL ratio and data transmission time when the processing delay of the UE is 2 subframes.
  • 20 is a block diagram illustrating a transmitter and a receiver for transmitting and receiving data using a method of performing HARQ according to an embodiment of the present invention.
  • the transmitter 100 includes a HARQ processor 110 and a radio frequency (RF) unit 120
  • the receiver 200 includes a HARQ processor 210 and a radio frequency (RF) unit 220. It includes.
  • the RF unit 120 is connected to the HARQ processor 110 to transmit and receive a radio signal
  • the RF unit 220 is connected to the HARQ processor 210 to transmit and receive a radio signal.
  • the HARQ processor 210 of the receiver 200 receives data from a base station, and transmits an ACK / NACK for the data to the base station at a point in time passed from the time point at which the data is transmitted from the base station.
  • the HARQ processor 110 of the transmitter 100 transmits data to a terminal, receives a non-acknowledgement (NACK) signal for the data transmission from the terminal, and passes a predetermined period from the time when the NACK signal is transmitted. At this point, the data is retransmitted to the terminal. Information about the predetermined period may be shared between the transmitter and the receiver.
  • a transmitter may be a base station and a receiver may be a terminal.
  • the invention can be implemented in hardware, software or a combination thereof.
  • an application specific integrated circuit ASIC
  • DSP digital signal processing
  • PLD programmable logic device
  • FPGA field programmable gate array
  • the module may be implemented as a module that performs the above-described function.
  • the software may be stored in a memory unit and executed by a processor.
  • the memory unit or processor may employ various means well known to those skilled in the art.

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

Abstract

L'invention concerne un procédé pour exécuter une HARQ dans un système de radiocommunication. Le procédé comprend les étapes suivantes : réception de données de la part d'une station de base et émission d'un ACK/NACK pour les données à la station de base après l'écoulement d'une période prédéterminée à partir de l'instant où les données sont émises depuis la station de base. Selon l'invention, les informations relatives à la période prédéterminée sont partagées entre la station de base et un terminal.
PCT/KR2009/003224 2008-06-16 2009-06-16 Procédé pour exécuter une harq dans un système de radiocommunication WO2009154394A2 (fr)

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