JP5044025B2 - Method and apparatus for supporting HARQ - Google Patents

Method and apparatus for supporting HARQ Download PDF

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JP5044025B2
JP5044025B2 JP2010544894A JP2010544894A JP5044025B2 JP 5044025 B2 JP5044025 B2 JP 5044025B2 JP 2010544894 A JP2010544894 A JP 2010544894A JP 2010544894 A JP2010544894 A JP 2010544894A JP 5044025 B2 JP5044025 B2 JP 5044025B2
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uplink
data
control information
cqi
base station
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JP2011511547A (en
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クイ アン,ジュン
ソン キム,ハク
ウォン リ,デ
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エルジー エレクトロニクス インコーポレイティド
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  The present invention relates to wireless communication, and more particularly, to a method and apparatus for supporting hybrid automatic repeat request (HARQ) in a wireless communication system.

  Wireless communication systems are widely deployed to provide various types of communication services such as voice and data. Generally, a wireless communication system is a multiple access system that can support communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, There are orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and the like.

  Recently, wireless communication has been developed to meet communication requirements with high frequency efficiency and reliability. Unfortunately, packet errors limit the overall system capacity due to interference due to fading channel environment and various causes.

  HARQ (Hybrid Automatic Repeat Request), which is an Automatic Repeat Request (ARQ) protocol combined with Forward Error Correction (FEC), is a key technology for the next generation of reliable communication. One of them. HARQ schemes can be roughly classified into two types. One is D. Chase, Code Combining: A maximum-likelihood decoding approach for combinating an arbitrary number of noise packets, H. 59, 59. CC (Chase Combining). The other is HARQ-IR (Increment Redundancy). In HARQ-CC, if a receiver detects an error through cyclic redundancy check (CRC) during decoding of a transmitted packet, the same packet with the same modulation and coding is retransmitted to the receiver. Is done. On the other hand, HARQ-IR retransmits different packets in which parity bits are processed through puncturing and repetition to obtain coding gain. In order to execute HARQ, it is necessary to exchange ACK (Acknowledgement) / NACK (Not-Acknowledgement) information regarding retransmission availability.

  Adaptive modulation and coding (AMC) is also a technique for reliable communication. The base station determines a modulation and coding scheme (MCS) used for transmission using a channel quality indicator (CQI) received from the terminal. In general, the CQI is an index of an element of an MCS table indicating MCS. There are two main methods for the terminal to transmit CQI. One is to transmit CQI periodically, and the other is to transmit CQI when requested by the base station.

3GPP (3 rd Generation Partnership Project) LTE (long term evolution) is part of the E-UTRA (Evolved-Universal Terrestrial Radio Access) using the E-UMTS (Evolved-Universal Mobile Telecommunications System), downlink Employs OFDMA and SC-FDMA on the uplink. The resource allocation scheme of 3GPP LTE is based on dynamic scheduling. The downlink physical channel of 3GPP LTE can be divided into a PDCCH (Physical Downlink Control Channel) that carries resource allocation information and a PDSCH (Physical Downlink Shared Channel) that carries downlink data. The uplink physical channel includes a PUCCH (Physical Uplink Control Channel) that carries uplink control information and a PUSCH (Physical Uplink Shared Channel) that carries uplink data. In downlink transmission, the terminal first receives a downlink grant on the PDCCH, and receives downlink data on the PDSCH indicated by the downlink grant. In uplink transmission, the terminal receives an uplink grant on the PDCCH and transmits uplink data on the PUSCH indicated by the uplink grant. Dynamic scheduling is a method for efficiently allocating resources, but a terminal must always receive a downlink / uplink grant first in order to transmit and / or receive data.

  Signaling overhead is one of the main causes of lowering transmission efficiency and worsening frequency efficiency. In the dynamic scheduling method, in addition to reception of PDCCH, HARQ execution and CQI transmission are performed using a plurality of signaling such as exchange of ACK / NACK information and exchange of transmission parameters for CQI.

  What is needed is a method that can reduce signaling overhead due to CQI transmission during HARQ.

  The technical problem to be solved by the present invention is to provide a method for multiplexing and transmitting CQI and retransmission data.

  In one aspect, a method for supporting HARQ (Hybrid Automatic Repeat Request) in a wireless communication system includes receiving an initial uplink grant on a downlink channel, using the initial uplink grant to uplink on an uplink channel. Transmitting data, receiving a request to retransmit the uplink data, determining at least one transmission parameter of a channel quality indicator (CQI) from the initial uplink grant, and determining the CQI of the uplink data. Multiplexing with retransmission data, a resource amount for transmission of the CQI is determined based on the at least one transmission parameter, and transmitting the multiplexed data on the uplink channel .

  A retransmission uplink grant for retransmission of the uplink data is received, and the retransmission data of the uplink data is multiplexed using the retransmission uplink grant. The request for the CQI report is included in the retransmission uplink grant.

  The retransmission data of the uplink data is multiplexed using the initial uplink grant. The downlink channel is a PDCCH (Physical Downlink Control Channel), and the uplink channel is a PUSCH (Physical Uplink Shared Channel).

  At least one transmission parameter of the CQI is associated with an MCS (Modulation and Coding Scheme) of the CQI. At least one transmission parameter of the CQI is determined such that the MCS of the CQI is the same as the MCS of the uplink data.

  In another aspect, an apparatus for wireless communication is provided. The apparatus includes an RF (Radio Frequency) unit for transmitting and receiving a radio signal; and a processor coupled to the RF unit, wherein the processor receives an initial uplink grant on a downlink channel, and receives the initial uplink grant. To transmit uplink data on an uplink channel, receive a retransmission request for the uplink data, and determine at least one transmission parameter of a channel quality indicator (CQI) from the initial uplink grant. The CQI is multiplexed with retransmission data of the uplink data, and a resource amount for the transmission of the CQI is determined based on the at least one transmission parameter and is multiplexed on the uplink channel. Set to send the data.

  A method of transmitting retransmission data and CQI together in performing HARQ is proposed. HARQ and AMC operations can be clarified, and signaling overhead can be reduced.

1 shows a wireless communication system. 3 shows a structure of a radio frame in 3GPP LTE. An example of the structure of a downlink sub-frame is shown. The structure of the uplink subframe in 3GPP LTE is shown. Fig. 4 shows uplink HARQ and CQI transmission. Fig. 4 shows dynamic scheduling in uplink transmission. FIG. 3 is an exemplary diagram illustrating multiplexing of data and control information on a PUSCH. The resource mapping on PUSCH is shown. 3 is a message sequence chart illustrating a HARQ method according to an embodiment of the present invention. 6 is a message sequence chart illustrating a HARQ method according to another embodiment of the present invention. 6 is a message sequence chart illustrating a HARQ method according to another embodiment of the present invention. 6 is a message sequence chart illustrating a HARQ method according to another embodiment of the present invention. 1 is a block diagram illustrating an apparatus for wireless communication according to an embodiment of the present invention.

  The following technologies include 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), etc. It can be used for various wireless communication systems. The CDMA can be implemented by a radio technology such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented by a radio technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented by a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (Evolved UTRA), and the like. UTRA is part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (long term evolution) is part of E-UMTS (Evolved UMTS) using E-UTRA, adopts OFDMA in the downlink, and SC-FDMA in the uplink. adopt.

  For clarity of explanation, 3GPP LTE is mainly described, but the technical idea of the present invention is not limited thereto.

  FIG. 1 shows a wireless communication system.

  Referring to FIG. 1, a wireless communication system (10) includes at least one base station (11; Base Station, BS). Each base station (11) provides a communication service for a specific geographical area (generally called a cell) (15a, 15b, 15c). A cell can be divided into a plurality of regions (referred to as sectors). The terminal (12; User Equipment, UE) can be fixed or mobile, and can be a mobile station (MS), a user terminal (UT), a subscriber station (SS). ), Wireless device, PDA (personal digital assistant), wireless modem, handheld device, etc. The base station (11) generally refers to a fixed station that communicates with the terminal (12), such as eNB (evolved-NodeB), BTS (Base Transceiver System), access point (Access Point), etc. Can be called in terms.

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

  The wireless communication system may support uplink and / or downlink HARQ (Hybrid Automatic Repeat Request). Also, CQI (channel quality indicator) can be used to support AMC (Adaptive Modulation and Coding).

  The CQI indicates a downlink channel state and may include a CQI index and / or a precoding matrix index (PMI). The CQI index indicates each entity of an MCS (Modulation and Coding Scheme) table including a plurality of entities configured by combinations of coding rate and modulation scheme. PMI is an index of a precoding matrix based on a codebook. The CQI may indicate a channel state for the entire band and / or a channel state for a part of the entire band.

  FIG. 2 shows a structure of a radio frame in 3GPP LTE. A radio frame is composed of 10 subframes, and one subframe is composed of two slots. The time required for transmission of one subframe is called a transmission time interval (TTI). For example, the length of one subframe is 1 ms, and the length of one slot is 0.5 ms. One slot includes a plurality of SC-FDMA symbols in the time domain, and includes a plurality of RBs (resource blocks) in the frequency domain. The SC-FDMA symbol is used to represent one symbol period because 3GPP LTE uses SC-FDMA in the uplink, and may be referred to as an OFDMA symbol or a symbol period depending on the system. . The RB is a resource allocation unit and includes a plurality of consecutive subcarriers in one slot.

  The structure of the radio frame is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of SC-FDMA symbols included in the slots can be variously changed.

  FIG. 3 shows an exemplary structure of a downlink subframe. A subframe includes two consecutive slots. Up to three OFDM symbols in the front part of the first slot in the subframe are control regions to which PDCCH (Physical Downlink Control Channel) is allocated, and the remaining OFDM symbols are PDSCH (Physical Downlink Shared). Channel) is a data area to be allocated. A PCFICH (Physical Control Format Indicator Channel) transmitted in the first OFDM symbol of a subframe carries information regarding the number of OFDM symbols used for transmission of PDCCH in the subframe.

  The PDCCH carries a downlink grant that informs resource allocation for downlink transmission on the PDSCH. More specifically, PDCCH includes DL-SCH (Downlink Shared Channel) resource allocation and transmission format, paging information on PCH (Paging Channel), system information on DL-SCH, and random access response transmitted on PDSCH. It is possible to carry resource allocation, transmission power control command, activation of VoIP (voice over IP), etc. Also, the PDCCH can carry an uplink grant that informs the terminal of resource allocation for uplink transmission. PCFICH informs the terminal of the number of OFDM symbols used for PDCCH and is transmitted for each subframe. A PHICH (Physical Hybrid ARQ Indicator Channel) carries a HARQ ACK (Acknowledgement) / NACK (Not-Acknowledgement) signal as a response to uplink transmission.

  FIG. 4 shows an uplink subframe structure in 3GPP LTE.

  Referring to FIG. 4, an uplink subframe includes a control region to which a PUCCH (Physical Uplink Control Channel) carrying uplink control information is allocated in a frequency domain and a PUSCH (Physical Uplink Shared Channel) carrying user data. It can be divided into data regions to be allocated. In order to maintain the single carrier property, one terminal does not transmit PUCCH and PUSCH at the same time.

  A PUCCH for one terminal is assigned to an RB pair in a subframe, and RBs belonging to the RB pair occupy different subcarriers in each of the two slots. This is called frequency hopping of the RB pair allocated to the PUCCH at the slot boundary.

  FIG. 5 shows uplink HARQ and CQI transmission.

  Referring to FIG. 5, the base station that has received the uplink data (100) on the PUSCH from the terminal transmits an ACK / NACK signal (101) for the uplink data (100) on the PHICH after a predetermined time has elapsed. . The base station that has received the uplink data (100) can transmit PHICH after 4 TTI, but the present invention is not limited to this. The ACK / NACK signal (101) becomes an ACK signal if the uplink data is successfully decoded, and becomes a NACK signal if the decoding of the uplink data fails. If the ACK / NACK signal (101) is determined to be a NACK signal, the terminal retransmits retransmission data (110) for the uplink data (100) to the base station. The retransmission can be performed up to the maximum number of retransmissions when an ACK signal is received. If the ACK / NACK signal (111) for the retransmission data (110) is determined to be an ACK signal, the terminal can transmit new uplink data (120) to the base station.

  The transmission time and resource allocation of the ACK / NACK signal for uplink / downlink data can be dynamically notified by the base station via signaling, or depending on the transmission time and resource allocation of the uplink / downlink data It can be predetermined.

  The terminal may measure the downlink channel condition and report the CQI to the base station periodically and / or aperiodically. A periodic CQI report refers to transmitting a CQI without a separate request from the base station according to a period given to the base station or a predetermined period, and an aperiodic CQI report is a request from the base station. It is said that CQI is transmitted as a response to. CQI can be sent on PUCCH or PUSCH, but is always sent on PUSCH when multiplexed with data. The CQI (180, 184) transmitted independently can be transmitted on the PUCCH or PUSCH. The CQI (182) transmitted with the uplink data can only be transmitted on the PUSCH. The CQI transmitted on the PUSCH may be periodic CQI or aperiodic CQI. The base station can use CQI to perform downlink scheduling.

  Hereinafter, HARQ in uplink transmission will be described, but those skilled in the art can easily apply the technical idea of the present invention to HARQ in downlink transmission.

  FIG. 6 shows dynamic scheduling in uplink transmission.

  Referring to FIG. 6, for uplink transmission, the UE transmits a scheduling request (SR) on the PUCCH to the base station. SR is a type of prior information exchange for data exchange in which a terminal requests uplink radio resource allocation to a base station. In order to transmit uplink data to the base station, the terminal first requests radio resource allocation via the SR. The base station transmits an uplink grant to the terminal on the PDCCH as a response to the SR. The uplink grant includes the allocation of uplink radio resources. The terminal transmits uplink data on the PDCCH through the allocated uplink radio resource.

  FIG. 7 is an exemplary diagram illustrating multiplexing of data and control information on the PUSCH. The PUSCH carries data and / or control information via resources allocated using the uplink grant.

Referring to FIG. 7, data bits a 0 , a 1 ,..., A A-1 are given in the form of one transport block for each TTI. First, data bits a 0, a 1, ..., a A-1 to CRC (Cyclic Redundancy Check) parity bits p 0, p 1, ..., and p L-1 are added, CRC overhead bits b 0 , b 1 ,..., B B-1 are generated (200). Here, B = A + L. The relationship between a k and b k can be shown as follows.

CRC additional bits b 0 , b 1 ,..., B B-1 are divided in units of code blocks, and CRC parity bits are added in units of code blocks again (210). The bit sequence output after code block segmentation is referred to as cr0 , cr1 , ..., cr (Kr-1) . Here, when the total number of code blocks is C, r represents a code block number and Kr represents the number of bits for the code block number r.

Channel coding is performed 220 on the bit sequence for a given code block. d (i) 0 , d (i) 0 ,..., d (i) D-1 means the encoded bits, D is the number of bits encoded per output stream, i is the bit from the encoder The stream output index.

The encoded bits are subjected to rate matching (230), code block concatenation (240), and data bit sequences f 0 , f 1 ,..., F G−. Generate 1 Here, G means the total number of encoded bits used to transmit bits excluding bits used for control information transmission when the control information is multiplexed on the PUSCH.

  On the other hand, control information can be multiplexed together with data. Data and control information can use different coding rates by assigning different numbers of coded symbols for their transmission. Hereinafter, CQI is considered as control information.

Channel coding is performed on the CQI values o 0 , o 1 ,..., O O-1 (O is the number of CQI bits), and the control information bit sequence q 0 , q 1 ,. -1 is generated (260). CQI can use independent channel coding different from data. For example, when the block code (32, O) is used as channel coding for CQI, the basic sequence M i, n is as shown in the following table.

Intermediate sequences b 0 , b 1 ,..., B 31 for CQI channel coding are generated as follows.

Control information bit sequence q 0, q 1, ..., q Q-1 , the intermediate sequence b 0, b 1, ..., is generated a b 31 is circulated repeated as follows.

Data bit sequence f 0, f 1 generated as described above, ..., f G-1 and the control information bit sequence q 0, q 1, ..., q Q-1 is multiplexed sequence g 0 , g 1 ,..., G H-1 are multiplexed (270). During multiplexing, the control information bit sequence q 0, q 1, ..., q Q-1 is located, the data bit sequence f 0, f 1 in the subsequent, ..., is f G-1 Can be arranged. That is, when H = G + Q, [g 0 , g 1 , ..., g H-1 ] = [q 0 , q 1 , ..., q Q-1 , f 0 , f 1 ,. .., f G-1 ].

The multiplexed sequences g 0 , g 1 ,..., G H-1 are mapped to the modulation sequences h 0 , h 1 ,. Here, h i is a modulation symbol on the constellation, and H ′ = H / Q m . Q m is the number of bits per modulation symbol for the modulation scheme. For example, when QPSK (Quadrature Phase Shift Keying) is used as the modulation method, Q m = 2.

Each modulation symbol of the modulation sequence h 0 , h 1 ,..., H H′-1 is mapped to a resource element for PUSCH (290). The resource element is an allocation unit on a subframe defined by one SC-FDMA symbol (or OFDMA symbol) and one subcarrier. The modulation symbols are mapped in time order. FIG. 8 shows resource mapping on PUSCH. One slot includes seven SC-FDMA symbols, and the fourth SC-FDMA symbol in each slot is used for transmission of a reference signal. Therefore, the maximum number of SC-FDMA symbols used for PUSCH in one subframe is 12. Modulation sequences h 0 , h 1 ,..., H H′-1 are mapped in the SC-FDMA symbol direction in the first subcarrier region, and then again in the second subcarrier region. Mapped in the FDMA symbol direction. Since the front part of the modulation sequence h 0 , h 1 ,..., H H′-1 corresponds to the CQI, the CQI is first mapped to the resource element in the front subcarrier region.

  As described above, first, in order to transmit CQI on PUSCH, it is necessary to determine the amount of resources necessary for CQI transmission. The amount of resources is determined based on transmission parameters such as MCS used for CQI transmission. The transmission parameter for CQI means a parameter used for transmission of CQI, and includes various parameters for determining the amount of MCS and / or resources. If the amount of resources is expressed by the number Q ′ of modulation symbols for CQI, Q ′ can be determined as follows.

Here, O is the number of CQI bits, L is the number of CRC bits, Δ is a parameter, C is the total number of code blocks, K r is the number of bits for the code block number r, and M sc is a subcarrier used for PUSCH transmission. The number, N symb , means the number of SC-FDMA symbols used for PUSCH transmission. The transmission parameter for determining the Q ′ is at least one of C, K r , M sc , and N symb .

  Hereinafter, a method in which retransmission data and CQI are multiplexed and transmitted to the PUSCH when HARQ is performed will be described.

  When performing HARQ, the CQI transmission may be multiplexed with initial data and transmitted, or may be multiplexed with retransmission data and transmitted. This may occur when the CQI transmission period matches the retransmission period in the periodic CQI report or when the response to the CQI transmission request matches the retransmission period in the aperiodic CQI report.

  When CQI is multiplexed with retransmission data, it becomes a problem how to determine a transmission parameter (for example, MCS) for CQI. This is a problem regarding which method is used to determine transmission parameters used for CQI multiplexed with retransmission data. The reason is that it can act as signaling overhead when the base station has to notify the terminal of transmission parameters for CQI transmission separately even during retransmission.

  When CQI is transmitted during data retransmission, CQI transmission parameters can be determined according to the transmission parameters used for initial data transmission. For example, the MCS used for initial data transmission is used for CQI transmission during retransmission.

  FIG. 9 is a message sequence chart illustrating a HARQ method according to an embodiment of the present invention.

  Referring to FIG. 9, in step S510, the base station transmits an initial uplink grant on the PDCCH. The initial uplink grant includes radio resource allocation information for initial uplink data in the HARQ method. In step S520, the UE transmits uplink data on the PUSCH indicated by the initial uplink grant.

  In step S530, the base station detecting the uplink data decoding error transmits a NACK signal as a retransmission request. A NACK signal can be sent on the PHICH.

In step S560, if the transmission subframe of retransmission data matches the transmission subframe of CQI, the terminal determines a transmission parameter of CQI from the initial uplink grant. The transmission parameter is a parameter for determining the amount of radio resources necessary for CQI transmission, and can be associated with the MCS of CQI. For example, when the amount of CQI radio resources is determined according to Equation 4, at least one of the transmission parameters C, K r , M sc , and N symb can be obtained from the initial uplink grant.

  In step S570, the UE multiplexes CQI with the retransmission data of the uplink data using the transmission parameter. In step S580, the multiplexed data is transmitted on the PUSCH.

  In the case of HARQ retransmission, when retransmission data and CQI are transmitted together, the CQI MCS is determined based on the initial uplink grant, so that separate signaling for the CQI transmission parameters to be multiplexed is not required. Overhead can be reduced.

  FIG. 10 is a message sequence chart illustrating a HARQ method according to another embodiment of the present invention.

  Referring to FIG. 10, in step S610, the base station transmits an initial uplink grant on the PDCCH. In step S620, the UE transmits uplink data on the PUSCH indicated by the initial uplink grant. In step S630, the base station that detects the uplink data decoding error transmits a NACK signal that is a retransmission request.

  In step S650, the base station transmits a retransmission grant on the PDCCH. The retransmission grant includes radio resource allocation information for retransmission data for the uplink data.

  In step S660, if the transmission data transmission subframe matches the CQI transmission subframe, the UE determines CQI transmission parameters from the initial uplink grant. In step S670, the UE multiplexes CQI with the retransmission data of the uplink data using the transmission parameters. At this time, retransmission data is multiplexed using a transmission parameter obtained from the retransmission grant, and CQI is multiplexed using a transmission parameter obtained from the initial grant. In step S680, the multiplexed data is transmitted on the PUSCH.

  FIG. 11 is a message sequence chart illustrating a HARQ method according to another embodiment of the present invention.

  Referring to FIG. 11, in step S700, the base station sets a periodic CQI. The terminal periodically transmits CQI according to the period set in the base station. In step S710, the base station transmits an initial uplink grant on the PDCCH. The initial uplink grant includes radio resource allocation information for initial uplink data in HARQ. In step S720, the UE transmits uplink data on the PUSCH indicated by the initial uplink grant.

  In step S730, the terminal transmits CQI in the CQI transmission cycle. At this time, if there is an available PUCCH resource, the CQI can be transmitted on the PUCCH. In step S740, the base station that detects the uplink data decoding error transmits a NACK signal that is a retransmission request.

  In step S760, if the transmission subframe of the retransmission data matches the CQI transmission period, the UE determines CQI transmission parameters from the initial uplink grant.

  In step S770, the UE multiplexes CQI with the retransmission data of the uplink data using the transmission parameters. In step S780, the multiplexed data is transmitted on the PUSCH.

  FIG. 12 is a message sequence chart illustrating a HARQ method according to another embodiment of the present invention.

  Referring to FIG. 12, in step S810, the base station transmits an initial uplink grant on the PDCCH. In step S820, the UE transmits uplink data on the PUSCH indicated by the initial uplink grant. In step S830, the base station that detects the uplink data decoding error transmits a NACK signal that is a retransmission request.

  In step S850, the base station transmits a retransmission grant and a CQI request on the PDCCH. The CQI request is a signal used by the base station to request CQI transmission from the terminal as necessary. Although the CQI request is transmitted on the PDCCH together with the retransmission grant, the CQI request may be transmitted to the terminal via a separate message.

  In step S860, the UE determines CQI transmission parameters from the initial uplink grant according to the CQI request of the base station. In step S870, the UE multiplexes CQI with the uplink data retransmission data using the transmission parameters. At this time, retransmission data is multiplexed using transmission parameters acquired from the retransmission grant, and CQI is multiplexed using transmission parameters acquired from the initial grant. In step S880, the multiplexed data is transmitted on the PUSCH.

  In the above embodiment, the CQI multiplexing at the first retransmission is proposed, but the CQI transmission parameter is initially increased even when the CQI is multiplexed and transmitted at the nth (n> 1) retransmission. Can be obtained from Link Grant.

  By using the transmission parameter used for initial data transmission as the CQI transmission parameter, no separate signaling for the CQI transmission parameter is required.

  In order to multiplex and transmit retransmission data and CQI on the PUSCH during HARQ, CQI transmission parameters can be obtained from other grants as well as the initial uplink grant. As an example, a transmission parameter used for retransmission data multiplexed with CQI may be a CQI transmission parameter. This uses the same MCS used for retransmission data for CQI transmission during retransmission. As another example, the transmission parameter used for the previous transmission can be used as the CQI transmission parameter. When the second retransmission data and CQI are multiplexed at the second retransmission, the transmission parameter used for the first retransmission data is set as the CQI transmission parameter.

  As described above, aperiodic CQI is transmission of CQI in response to a request from a base station. A CQI request can generally be sent on the PDCCH. At this time, a transmission indicator for the CQI transmission parameter can be transmitted together with the CQI request. The CQI can be transmitted using the resource (or transmission parameter) allocated according to the transmission indicator, or the CQI can be transmitted using the previously allocated resource (or transmission parameter).

  FIG. 13 is a block diagram illustrating an apparatus for wireless communication according to an embodiment of the present invention. This wireless communication device 50 may be part of a terminal. A device (50) for wireless communication includes a processor (processor, 51), a memory (memory, 52), an RF unit (Radio Frequency unit, 53), a display unit (display unit, 54), a user interface unit (user interface). unit, 55). The RF unit (53) is connected to the processor (51) and transmits and / or receives a radio signal. The memory (52) is connected to the processor (51) and stores a driving system, applications, and general files. The display unit 54 displays various information of the terminal, and well-known elements such as an LCD (Liquid Crystal Display) and an OLED (Organic Light Emitting Diodes) can be used. The user interface unit 55 can be configured by a combination of well-known user interfaces such as a keypad and a touch screen. The processor (51) supports HARQ and AMC. The processor (51) can configure PUCCH or PUSCH to perform data and CQI multiplexing. The embodiment for the HARQ execution method described above can be executed by the processor 51.

  The present invention can be implemented in hardware, software, or a combination thereof. In hardware implementation, ASIC (application specific integrated circuit), DSP (digital signal processing), PLD (programmable logic device), FPGA (field programmable gate array), processor, controller designed to perform the functions described above , A microprocessor, other electronic units, or a combination thereof. In software implementation, it may be implemented by a module that performs the above-described functions. Software can be stored in the memory unit and executed by the processor. For the memory unit and the processor, various means well known to those skilled in the art can be adopted.

  Although the present invention has been described with reference to the embodiments, those skilled in the art can make various modifications and modifications to the present invention without departing from the technical idea and scope of the present invention. It can be understood that it can be implemented with changes. Accordingly, the invention is not limited to the embodiments described above, but the invention includes all embodiments within the scope of the claims.

Claims (16)

  1. In a data retransmission method in a wireless communication system,
    A terminal receives a first uplink grant on a downlink channel from a base station, wherein the first uplink grant indicates a resource for transmitting uplink data to the base station, and the first uplink grant The uplink grant is based on at least one transmission parameter for the uplink data transmission;
    Transmitting the uplink data on an uplink data channel using the resource indicated by the first uplink grant;
    Receiving an instruction to retransmit the uplink data from the base station;
    Identifying whether there is control information that must be transmitted together to the base station upon retransmission of the uplink data;
    Determining at least one transmission parameter for transmitting control information to transmit the control information to the base station, wherein at least one transmission parameter for transmitting the control information is for transmitting the uplink data; Determining according to at least one transmission parameter;
    Determining a resource amount for transmission of the control information according to the determined at least one transmission parameter;
    Multiplexing the retransmission data with the control information such that the control information and retransmission data are transmitted using resources indicated by a second uplink grant; and
    Transmitting the multiplexed data to an uplink data channel using the resource indicated by the second uplink grant;
    A method comprising the steps of:
  2. The method of claim 1, wherein the wireless communication system is a single wave frequency division multiple access (SC-FDMA) system.
  3. The method of claim 1, further comprising receiving the second uplink grant indicating the resource for uplink data retransmission on the downlink channel from the base station.
  4. The method of claim 1, wherein the uplink control information is a channel quality indicator (CQI).
  5. The method of claim 4, wherein at least one transmission parameter for transmitting the control information is associated with a modulation and coding scheme (MCS) of the CQI.
  6. 6. The method of claim 5, wherein the CQI MCS and the uplink data MCS are determined to be the same as at least one transmission parameter for transmitting the control information.
  7. The method of claim 1, wherein the downlink channel is a physical downlink control channel (PDCCH).
  8. The method of claim 1, wherein the uplink data channel is a physical uplink shared channel (PUSCH).
  9. An RF unit for transmitting and receiving radio signals; and
    A processor coupled to the RF unit;
    Receiving a first uplink grant on a downlink channel from a base station, wherein the first uplink grant indicates a resource for transmitting uplink data to the base station, and A link grant is based on at least one transmission parameter for the uplink data transmission,
    Transmitting the uplink data on an uplink data channel using the resource indicated by the first uplink grant;
    Receiving an uplink data retransmission instruction from the base station;
    Identifying whether there is control information that must be transmitted to the base station upon retransmission of the uplink data;
    Determining at least one transmission parameter for transmitting control information to transmit the control information to the base station, wherein at least one transmission parameter for transmitting the control information is for transmitting the uplink data; Determined according to at least one transmission parameter,
    Determining a resource amount for transmission of the control information according to the determined at least one transmission parameter;
    Multiplexing the retransmission data with the control information so that the control information and retransmission data are transmitted using resources indicated by a second uplink grant;
    A terminal for retransmitting data in a wireless communication system, wherein the multiplexed data is transmitted to an uplink data channel using the resource indicated by the second uplink grant.
  10. The terminal according to claim 9, wherein the wireless communication system is an SC-FDMA system.
  11. The terminal of claim 9, further comprising: receiving the second uplink grant indicating the resource for uplink data retransmission on the downlink channel from the base station.
  12. The terminal of claim 9, wherein the uplink control information is a channel quality indicator (CQI).
  13. The terminal according to claim 12, wherein at least one transmission parameter for transmitting the control information is associated with a modulation and coding scheme (MCS) of the CQI.
  14. The terminal of claim 13, wherein the CCS MCS and the uplink data MCS are determined to be the same as at least one transmission parameter for transmitting the control information.
  15. The terminal according to claim 9, wherein the downlink channel is a physical downlink control channel (PDCCH).
  16. The uplink data channel is a physical uplink shared channel (PUSCH)
    The terminal according to claim 9, wherein:
JP2010544894A 2008-02-03 2009-02-02 Method and apparatus for supporting HARQ Active JP5044025B2 (en)

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US2581108P true 2008-02-03 2008-02-03
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PCT/KR2009/000499 WO2009096752A1 (en) 2008-02-03 2009-02-02 Method and apparatus for supporting harq

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KR20090084996A (en) 2009-08-06
CN101933282B (en) 2014-04-16

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