KR20100134023A - Method for performing a harq in a radio communication system - Google Patents

Method for performing a harq in a radio communication system Download PDF

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KR20100134023A
KR20100134023A KR1020107022661A KR20107022661A KR20100134023A KR 20100134023 A KR20100134023 A KR 20100134023A KR 1020107022661 A KR1020107022661 A KR 1020107022661A KR 20107022661 A KR20107022661 A KR 20107022661A KR 20100134023 A KR20100134023 A KR 20100134023A
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subframe
subframe group
harq
data
frame
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KR1020107022661A
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Korean (ko)
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KR101117002B1 (en
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박형호
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엘지전자 주식회사
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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
    • H04L1/1854—Scheduling and prioritising arrangements
    • 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
    • H04L1/1861—Physical mapping arrangements

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

Abstract

PURPOSE: In the wireless telecommunications system, by reducing the control signal overhead for being proceed the HARQ process the HARQ implementing method reduces the time delay according to the HARQ process. CONSTITUTION: The base station transmits first data through the subframe group A with the terminal(S100). Second data is transmitted through the subframe group B to the terminal(S110). The subframe group A and subframe group B comprise one or more subframe. The terminal transmits the ACK/NACK about first data through the subframe group A with the base station(S120).

Description

How to perform HARQ in wireless communication system {METHOD FOR PERFORMING A HARQ IN A RADIO COMMUNICATION SYSTEM}

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.

Error compensation techniques for securing communication reliability include a forward error correction (FEC) scheme and an automatic repeat request (ARQ) scheme. In the FEC scheme, an error at the receiver is corrected by adding an extra error correction code to the information bits. In the ARQ scheme, 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. 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. To solve these shortcomings, a hybrid automatic repeat request (HARQ) method combining FEC and ARQ is proposed. According to the HARQ method, whether the data received by the physical layer includes an error that cannot be decoded, and when an error occurs, retransmission is requested to improve performance.

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). When the CRC detection process detects an error in the received data, 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. 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.

The HARQ retransmission scheme can be divided into synchronous and asynchronous. Synchronous HARQ retransmits data at a time point known to both the transmitter and the receiver, thereby reducing signaling required for data transmission such as a HARQ processor number. Asynchronous HARQ is a method of allocating resources at random times for retransmission, and requires overhead for data transmission.

In general, data packets are transmitted using HARQ in units of one subframe. Accordingly, the control signal overhead for HARQ has a large problem.

The technical problem to be solved by the present invention is to provide a method of performing HARQ.

In a wireless communication system according to an aspect of the present invention, a method for performing a hybrid automatic repeat request (HARQ) of a terminal includes receiving data through a first subframe group including a plurality of subframes and pairing with the first subframe group. And transmitting an ACK / NACK for the data through a second subframe group consisting of at least one subframe.

The ACK / NACK may be transmitted at least two subframes after the first data is received.

The plurality of subframes constituting the first subframe group may be located in a downlink region of a frame, and the at least one subframe constituting the second subframe may be located in an uplink region of the frame.

In a method of performing HARQ of a base station in a wireless communication system according to an aspect of the present invention, grouping subframes within a frame into a plurality of subframe groups, and transmitting to one of the plurality of subframe groups to a terminal And transmitting data and checking whether the data has been successfully received by the terminal, wherein each subframe group includes at least one subframe.

The frame is a TDD frame, and the number of subframe groups in the downlink region is the same as the number of subframe groups in the uplink region, and the subframe group in each downlink region is equal to the subframe group in each uplink region. Can be paired.

The HARQ process may be independently performed for each subframe group in the downlink region.

Whether the data has been successfully received by the terminal may be confirmed using ACK / NACK received through a subframe group in an uplink region paired with the subframe group in which the data is transmitted.

The method may further include signaling grouping information about the plurality of subframe groups to the terminal.

The grouping information may include information about the number of subframes constituting one subframe group and the index of the subframe.

The signaling may be transmitted through a superframe header.

The signaling may be transmitted through a MAP message.

According to an aspect of the present invention, a terminal includes a radio frequency (RF) unit for transmitting and receiving a radio signal and a processor connected to the RF unit, wherein the processor transmits data through a first subframe group including a plurality of subframes. And an ACK / NACK for the data is transmitted through a second subframe group composed of at least one subframe, paired with the first subframe group.

A base station according to an aspect of the present invention includes a radio frequency (RF) unit for transmitting and receiving a radio signal and a processor connected to the RF unit, wherein the processor groups the subframes in the frame into a plurality of subframe groups, Data is transmitted to the terminal through one subframe group among the plurality of subframe groups, and it is checked whether the data has been successfully received by the terminal.

An efficient method of performing HARQ may be provided. In particular, it is possible to reduce the control signal overhead for performing the HARQ process, and to reduce the time delay according to the HARQ process. In addition, uplink cell coverage may be extended. A method of performing HARQ that can be applied to not only synchronous HARQ but also asynchronous HARQ can be provided.

1 shows a wireless communication system.
2 shows an example of a frame structure.
3 is an exemplary diagram illustrating processing of an information block for performing HARQ.
4 shows an example of a redundancy version of an encoded packet.
5 shows data transmission using HARQ.
6 is a flowchart illustrating a method of performing HARQ according to an embodiment of the present invention.
7 is a flowchart illustrating a method of performing HARQ according to another embodiment of the present invention.
8 to 10 illustrate a subframe grouping method for HARQ according to an embodiment of the present invention when the DL / UL ratio is 4: 4.
11 and 12 illustrate a subframe grouping method for HARQ according to an embodiment of the present invention when the DL / UL ratio is 5: 3.
13 to 21 illustrate a subframe grouping method for HARQ according to an embodiment of the present invention when the DL / UL ratio is 6: 2.
22 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.

DETAILED DESCRIPTION OF THE INVENTION

The following techniques include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and the like. It can be used in various wireless communication systems. 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). 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.

For clarity, the following description focuses on IEEE 802.16m, but the technical spirit of the present invention is not limited thereto.

1 shows a wireless communication system.

Referring to FIG. 1, 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 may again be divided into multiple regions (referred to as 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.

Hereinafter, downlink (DL) means communication from the base station to the terminal, and uplink (UL) means communication from the terminal to the base station. In downlink, a transmitter may be part of a base station and a receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal and a receiver may be part of a base station.

2 shows an example of a frame structure.

Referring to FIG. 2, 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). SFH is divided into P-SFH (Primary SFH) and S-SFH (Secondary SFH).

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. In TDD, 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. In FDD, 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. Uplink transmission and downlink transmission occupy different frequency bands and may be simultaneously performed.

The subframe includes at least one frequency partition. The frequency partition is composed of at least one Physical Resource Unit (PRU). 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).

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 (LRUs) 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.

Logical Distributed Resource Units (DRUs) may be used to obtain frequency diversity gain. 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 (CRUs) 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.

Referring to FIG. 3, all or part of an information block is sent to a transport block for transmission to a physical layer, and one transport block is appended with a CRC, which is an error detection code. This is called a CRC attachment. The information block may be referred to as a Protocol Data Unit (PDU) of Medium Access Control (MAC). When a layer that performs HARQ is called a physical layer, a MAC PDU is a data unit transmitted from the upper layer MAC layer to the physical layer.

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. However, the technical concept of the present invention can be applied to an LDPC (low density parity check code) or other convolutional codes as well as the error correction code.

One HARQ function is performed in units of transport blocks. 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.

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.

4 shows an example of a redundancy version of an encoded packet.

Referring to FIG. 4, an entire bit string of an encoded packet is called a mother codeword, and 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. When the mother code rate is I / 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 . If the encoder uses a Convolutional Turbo Code (CTC) with a double binary (duo-binary) structure, 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. When the size of the internal interleaver of the CTC turbo encoder is N, N EP = 2 × N. If the mother coding rate is 1/3, the mother code includes one structural bit and two parity bits.

In HARQ in incremental redundancy (IR) mode, 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). For example, the first bitstream block containing structural bits is RV 0, the second bitstream block contiguous to the first bitstream block is RV 1, and 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.

Although the sizes of the bit string blocks of different RVs are the same, the size of the bit string blocks of each RV 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.

5 shows data transmission using HARQ.

Referring to FIG. 5, data transmission is performed in units of transmission time interval (TTI). TTI is a transmission time of an encoded packet over an air interface, and the encoded packet is generated at the physical layer. The time from when the transmitter Tx transmits data to the time immediately before receiving the ACK / NACK signal for the data transmission from the receiver Rx and retransmitting the data is called a round trip time (RTT). The RTT includes a processing delay, which is a time required for data processing at the transmitter Tx and the receiver Rx.

In general, data packets are transmitted using HARQ in units of one subframe. Accordingly, the control signal overhead for HARQ may be large. Hereinafter, a method of performing HARQ to solve this problem 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.

6 is a flowchart illustrating a method of performing HARQ according to an embodiment of the present invention. For convenience of description, a case in which 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.

Referring to FIG. 6, the base station transmits first data to the terminal through the subframe group A (S100), and transmits second data to the terminal through the subframe group B (S110). Each of subframe group A and subframe group B includes at least one subframe. When a plurality of subframes are included in one subframe group, the plurality of subframes are contiguous in the time domain. Subframe group A and subframe group B consist of downlink subframes within one frame.

The terminal transmits the ACK / NACK for the first data received in step S100 to the base station through subframe group A '(S120), and the second data received in step S110 to the base station through subframe group B'. ACK / NACK is transmitted (S130). Subframe group A 'is paired with subframe group A, and subframe group B' is paired with subframe group B. Each of subframe group A 'and subframe group B' includes at least one subframe. When a plurality of subframes are included in one subframe group, the plurality of subframes are contiguous in the time domain. Subframe group A 'and subframe group B' consist of uplink subframes within one frame.

7 is a flowchart illustrating a method of performing HARQ according to another embodiment of the present invention. For convenience of description, a case in which 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.

Referring to FIG. 7, the base station groups subframes in a TDD frame to perform HARQ (S200). The grouping method may vary according to the downlink region to uplink region ratio (hereinafter, referred to as DL / UL ratio) in the TDD frame. For example, each of the downlink region and the uplink region in one TDD frame may be grouped into K subframe groups. Each subframe group includes at least one subframe. Each subframe group in the downlink region is paired with each subframe group in the uplink region.

The base station signals the information on the subframe grouping to the terminal (S210). The information on the subframe grouping may include information about the number of subframes constituting one subframe group and the index of the subframe. In this case, signaling may be performed through a MAP message or a control channel corresponding thereto. The control channel may be located in the superframe header. Signaling may be performed in units of superframes. Or, it may be performed in a unit in which the DL / UL ratio is determined. Alternatively, the HARQ process may be performed for UEs that are permanently assigned (Persistent Scheduling, for example, Voice over Internet Protocol (VoIP)) and Dynamic Scheduling.

The base station transmits data to the terminal through each subframe group in the downlink region (S220), and the terminal ACKs the data through the subframe group paired with the subframe group in which the data of step S220 is transmitted. Transmit / NACK to the base station (S230). If the base station receives a NACK from the terminal in step S230, or does not receive any signal within a certain time, the base station retransmits the data of step S220 (S240). RTT may vary according to the DL / UL ratio in the TDD frame. This will be described later.

As such, each HARQ process is performed in each subframe group. Accordingly, overhead due to a control signal (eg, HARQ channel ID, redundancy version, etc.) necessary for performing HARQ is reduced.

6 and 7, each subframe group in the uplink region and each subframe group in the downlink region are paired, and each HARQ process is performed through a pair of subframe groups. This may perform each HARQ process through each subframe group in the downlink region, but the uplink region may be extended to be shared by all HARQ processes.

Hereinafter, an embodiment of a method of grouping subframes to perform a HARQ process will be described. Embodiments described in the present specification are merely exemplary and are not limited thereto. For convenience of description, the description is based on the TDD frame, but this may also be applied to the FDD frame.

8 to 10 illustrate a subframe grouping method for HARQ according to an embodiment of the present invention when the DL / UL ratio is 4: 4. It is assumed that each of the terminal and the base station has a processing delay of at least two subframes. If one subframe is assumed to be 1 TTI, the processing delay of each of the terminal and the base station is 2 TTIs. The processing delay of the terminal and the base station may be 2 subframes or more. In addition, the processing delay of the terminal and the base station may be different. In addition, the processing delay of the terminal and the base station may be set in subframe group units.

8 to 10, SF (subframe) # 0 to SF # 3 is a downlink subframe, and SF # 4 to SF # 7 are uplink subframes in each frame.

Referring to FIG. 8, the subframe group A of the downlink region is composed of two consecutive subframes SF ＃ 0 and SF ＃ 1, and the subframe group B is composed of two consecutive subframes SF ＃ 2, SF # 3). The subframe group A 'of the uplink region is composed of two consecutive subframes (SF # 4, SF # 5), and the subframe group B' is composed of two consecutive subframes (SF # 6, SF # 7). Is done.

Referring to FIG. 9, subframe group A of the downlink region consists of three consecutive subframes SF SF 0, SF ＃ 1, and SF ＃ 2, and subframe group B has one subframe SF ＃. 3) The subframe group A 'of the uplink region consists of three consecutive subframes (SF # 4, SF # 5, SF # 6), and the subframe group B' consists of one subframe (SF # 7). .

Referring to FIG. 10, the subframe group A of the downlink region consists of one subframe SF ＃ 0, and the subframe group B includes three consecutive subframes SF SF 1, SF ＃ 2, and SF ＃. 3) The subframe group A 'of the uplink region consists of one subframe (SF # 4), and the subframe group B' consists of three consecutive subframes (SF # 5, SF # 6, SF # 7). .

8 to 10, first downlink data is transmitted through subframe group A of frame n, and ACK / NACK for the first downlink data is transmitted through subframe group A ′ of frame n. Second downlink data is transmitted through subframe group B of frame n, and ACK / NACK for the second downlink data is transmitted through subframe group B 'of frame n.

When data retransmission is required, if synchronous HARQ, the first downlink data is retransmitted through subframe group A of frame n + 1, and the second downlink data is retransmitted through subframe group B of frame n + 1. In the case of asynchronous HARQ, the first downlink data and the second downlink data are retransmitted through a time point after the frame n + 1. Retransmission time in asynchronous HARQ may be shared through a separate scheduling between the terminal and the base station.

11 and 12 illustrate a subframe grouping method for HARQ according to an embodiment of the present invention when the DL / UL ratio is 5: 3. It is assumed that each of the terminal and the base station has a processing delay of at least two subframes. If one subframe is assumed to be 1 TTI, the processing delay of each of the terminal and the base station is 2 TTIs. The processing delay of the terminal and the base station may be 2 subframes or more. In addition, the processing delay of the terminal and the base station may be different. In addition, the processing delay of the terminal and the base station may be set in subframe group units.

11 and 12, in each frame, SF # 0 through SF # 4 are downlink subframes, and SF # 5 through SF # 7 are uplink subframes.

Referring to FIG. 11, the subframe group A of the downlink region consists of three consecutive subframes SF # 0, SF # 1, and SF # 2, and the subframe group B includes two consecutive subframes ( SF # 3, SF # 4). The subframe group A 'of the uplink region consists of two consecutive subframes SF # 5 and SF # 6, and the subframe group B' consists of one subframe SF # 7.

Referring to FIG. 12, subframe group A of the downlink region consists of two consecutive subframes SF ＃ 0 and SF ＃ 1, and subframe group B includes three consecutive subframes SF 서브 2, SF # 3, SF # 4). The subframe group A 'of the uplink region consists of one subframe SF # 5, and the subframe group B' consists of two consecutive subframes SF # 6 and SF # 7.

11 and 12, the first downlink data is transmitted through subframe group A of frame n, and the ACK / NACK for the first downlink data is transmitted through subframe group A ′ of frame n. Second downlink data is transmitted through subframe group B of frame n, and ACK / NACK for the second downlink data is transmitted through subframe group B 'of frame n.

When data retransmission is required, if synchronous HARQ, the first downlink data is retransmitted through subframe group A of frame n + 1, and the second downlink data is retransmitted through subframe group B of frame n + 1. In the case of asynchronous HARQ, the first downlink data and the second downlink data are retransmitted through a time point after the frame n + 1. Retransmission time in asynchronous HARQ may be shared through a separate scheduling between the terminal and the base station.

13 to 21 illustrate a subframe grouping method for HARQ according to an embodiment of the present invention when the DL / UL ratio is 6: 2. In each frame, SF # 0 through SF # 5 are downlink subframes, and SF # 6 and SF # 7 are uplink subframes.

13 to 15, the subframe group A of the downlink region is composed of three consecutive subframes (SF # 0, SF # 1, SF # 2), and the subframe group B is composed of three consecutive frames. It consists of subframes SF # 3, SF # 4, SF # 5. The subframe group A 'of the uplink region consists of one subframe SF # 6, and the subframe group B' consists of one subframe SF # 7.

First downlink data is transmitted through subframe group A of frame n, and ACK / NACK for the first downlink data is transmitted through subframe group A 'of frame n. Second downlink data is transmitted through subframe group B of frame n, and ACK / NACK for the second downlink data is transmitted through subframe group B 'of frame n.

At this time, the data retransmission time point may vary depending on the processing delay of the terminal and the base station. FIG. 13 illustrates a case where a processing delay of a base station is one subframe, and FIGS. 14 and 15 illustrate a case where a processing delay of a terminal and a base station is two subframes.

In FIG. 13, when data retransmission is required, if synchronous HARQ, the first downlink data is retransmitted through subframe group A of frame n + 1, and the second downlink data is transmitted through subframe group B of frame n + 1. Is resent. In the case of asynchronous HARQ, the first downlink data and the second downlink data are retransmitted through a time point after the frame n + 1. Retransmission time in asynchronous HARQ may be shared through a separate scheduling between the terminal and the base station.

In FIG. 14, if data retransmission is required, if synchronous HARQ, the first downlink data is retransmitted through subframe group A of frame n + 2, and the second downlink data is transmitted through subframe group B of frame n + 2. Is resent. In the case of asynchronous HARQ, the first downlink data and the second downlink data are retransmitted through a time point after the frame n + 2. Retransmission time in asynchronous HARQ may be shared through a separate scheduling between the terminal and the base station.

In FIG. 15, when data retransmission is required, if synchronous HARQ, the second downlink data is retransmitted through subframe group B of frame n + 1, and the first downlink data is transmitted through subframe group A of frame n + 2. Is resent. In the case of asynchronous HARQ, the second downlink data is retransmitted through a time point after the subframe group B of the frame n + 1, and the first downlink data is retransmitted through a time point after the subframe group A of the frame n + 2. Retransmission time in asynchronous HARQ may be shared through a separate scheduling between the terminal and the base station.

16 to 18, the subframe group A of the downlink region is composed of four consecutive subframes (SF # 0, SF # 1, SF # 2, SF # 3), and the subframe group B is It consists of two consecutive subframes (SF # 4, SF # 5). The subframe group A 'of the uplink region consists of one subframe SF # 6, and the subframe group B' consists of one subframe SF # 7.

First downlink data is transmitted through subframe group A of frame n, and ACK / NACK for the first downlink data is transmitted through subframe group A 'of frame n. Second downlink data is transmitted through subframe group B of frame n, and ACK / NACK for the second downlink data is transmitted through subframe group B 'of frame n.

At this time, the data retransmission time point may vary depending on the processing delay of the terminal and the base station. FIG. 16 illustrates a case in which a processing delay of a base station is 1 subframe, and FIGS. 17 and 18 illustrate a case in which a processing delay of a terminal and a base station is 2 subframes.

In FIG. 16, when data retransmission is required, if synchronous HARQ, the first downlink data is retransmitted through subframe group A of frame n + 1, and the second downlink data is transmitted through subframe group B of frame n + 1. Is resent. In the case of asynchronous HARQ, the first downlink data and the second downlink data are retransmitted through a time point after the frame n + 1. Retransmission time in asynchronous HARQ may be shared through a separate scheduling between the terminal and the base station.

In FIG. 17, when data retransmission is required, if synchronous HARQ, the first downlink data is retransmitted through subframe group A of frame n + 2, and the second downlink data is transmitted through subframe group B of frame n + 2. Is resent. In the case of asynchronous HARQ, the first downlink data and the second downlink data are retransmitted through a time point after the frame n + 2. Retransmission time in asynchronous HARQ may be shared through a separate scheduling between the terminal and the base station.

In FIG. 18, when data retransmission is required, if synchronous HARQ, the second downlink data is retransmitted through subframe group B of frame n + 1, and the first downlink data is transmitted through subframe group A of frame n + 2. Is resent. In the case of asynchronous HARQ, the second downlink data is retransmitted through a time point after the subframe group B of the frame n + 1, and the first downlink data is retransmitted through a time point after the subframe group A of the frame n + 2. Retransmission time in asynchronous HARQ may be shared through a separate scheduling between the terminal and the base station.

19 to 21, the subframe group A of the downlink region is composed of two consecutive subframes SF ＃ 0 and SF ＃ 1, and the subframe group B is four consecutive subframes SF. # 2, SF # 3, SF4, SF5). The subframe group A 'of the uplink region consists of one subframe SF # 6, and the subframe group B' consists of one subframe SF # 7.

First downlink data is transmitted through subframe group A of frame n, and ACK / NACK for the first downlink data is transmitted through subframe group A 'of frame n. Second downlink data is transmitted through subframe group B of frame n, and ACK / NACK for the second downlink data is transmitted through subframe group B 'of frame n.

At this time, the data retransmission time point may vary depending on the processing delay of the terminal and the base station. 19 illustrates a case where a processing delay of a base station is one subframe, and FIGS. 20 and 21 illustrate a case where a processing delay of a terminal and a base station is two subframes.

In FIG. 19, when data retransmission is required, if synchronous HARQ, the first downlink data is retransmitted through subframe group A of frame n + 1, and the second downlink data is transmitted through subframe group B of frame n + 1. Is resent. In the case of asynchronous HARQ, the first downlink data and the second downlink data are retransmitted through a time point after the frame n + 1. Retransmission time in asynchronous HARQ may be shared through a separate scheduling between the terminal and the base station.

In FIG. 20, when data retransmission is required, if synchronous HARQ, the first downlink data is retransmitted through subframe group A of frame n + 2, and the second downlink data is transmitted through subframe group B of frame n + 2. Is resent. In the case of asynchronous HARQ, the first downlink data and the second downlink data are retransmitted through a time point after the frame n + 2. Retransmission time in asynchronous HARQ may be shared through a separate scheduling between the terminal and the base station.

In FIG. 21, if data retransmission is required, if synchronous HARQ, the second downlink data is retransmitted through subframe group B of frame n + 1, and the first downlink data is transmitted through subframe group A of frame n + 2. Is resent. In the case of asynchronous HARQ, the second downlink data is retransmitted through a time point after the subframe group B of the frame n + 1, and the first downlink data is retransmitted through a time point after the subframe group A of the frame n + 2. Retransmission time in asynchronous HARQ may be shared through a separate scheduling between the terminal and the base station.

22 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.

Referring to FIG. 20, the transmitter 100 includes a HARQ processor 110 and a radio frequency (RF) unit 120, and 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, and 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 through a first subframe group consisting of a plurality of subframes, pairs with the first subframe group, and comprises a second subframe consisting of at least one subframe. The ACK / NACK for the data is transmitted through the frame group. The HARQ processor 110 of the transmitter 100 groups subframes within a frame into a plurality of subframe groups, transmits data to a terminal through one subframe group among the plurality of subframe groups, and transmits the data. Check whether or not is successfully received by the terminal. In downlink data transmission, a transmitter may be a base station and a receiver may be a terminal.

The present invention may be implemented in hardware, software, or a combination thereof. (DSP), a programmable logic device (PLD), a field programmable gate array (FPGA), a processor, a controller, a microprocessor, and the like, which are designed to perform the above- , Other electronic units, or a combination thereof. In the software implementation, 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.

As mentioned above, preferred embodiments of the present invention have been described in detail, but those skilled in the art to which the present invention pertains should understand the present invention without departing from the spirit and scope of the present invention as defined in the appended claims. It will be appreciated that various modifications or changes can be made. Accordingly, modifications of the embodiments of the present invention will not depart from the scope of the present invention.

Claims (13)

In a method of performing a hybrid automatic repeat request (HARQ) of a terminal in a wireless communication system,
Receiving data via a first subframe group consisting of a plurality of subframes; And
And pairing with the first subframe group and transmitting an ACK / NACK for the data through a second subframe group including at least one subframe. The method of claim 1,
And transmitting the ACK / NACK at least two subframes after the first data is received. The method of claim 1,
The plurality of subframes constituting the first subframe group are located in a downlink region of a frame, and the at least one subframe constituting the second subframe is located in an uplink region of the frame. How to do it. In a method of performing HARQ of a base station in a wireless communication system,
Grouping subframes within the frame into a plurality of subframe groups;
Transmitting data to a terminal through one subframe group among the plurality of subframe groups; And
Including checking whether the data has been successfully received by the terminal,
Each subframe group includes at least one subframe. The method of claim 4, wherein
The frame is a TDD frame, and the number of subframe groups in the downlink region is the same as the number of subframe groups in the uplink region, and the subframe group in each downlink region is equal to the subframe group in each uplink region. HARQ method characterized in that the pairing. The method of claim 5, wherein
HARQ method, characterized in that the HARQ process is performed independently for each subframe group in the downlink region. The method of claim 5, wherein
Whether or not the data has been successfully received by the terminal is HARQ performed by using ACK / NACK received through the subframe group in the uplink region paired with the subframe group to which the data is transmitted Way. The method of claim 4, wherein
And signaling the grouping information for the plurality of subframe groups to the terminal. The method of claim 8,
The grouping information, HARQ performing method comprising the information on the number of subframes and the index of the subframe constituting one subframe group. The method of claim 8,
The signaling is performed HARQ method characterized in that transmitted through the superframe header. The method of claim 8,
The signaling is a method of performing HARQ, characterized in that transmitted through the MAP message. RF (Radio Frequency) unit for transmitting and receiving a wireless signal; And
Including a processor connected to the RF unit,
The processor receives data through a first subframe group consisting of a plurality of subframes, pairs with the first subframe group,
A terminal for transmitting an ACK / NACK for the data through a second subframe group consisting of at least one subframe. RF (Radio Frequency) unit for transmitting and receiving a wireless signal; And
Including a processor connected to the RF unit,
The processor groups the subframes in the frame into a plurality of subframe groups, transmits data to the terminal through one subframe group of the plurality of subframe groups, and the data is successfully received by the terminal. To check whether the base station.
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