KR101455858B1 - Method and apparatus for transmission of uplink control channel acknowledgement channel for downlink control channel in mobile communication systems using orthogonal frequency division multiple access - Google Patents
Method and apparatus for transmission of uplink control channel acknowledgement channel for downlink control channel in mobile communication systems using orthogonal frequency division multiple access Download PDFInfo
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- KR101455858B1 KR101455858B1 KR20070099538A KR20070099538A KR101455858B1 KR 101455858 B1 KR101455858 B1 KR 101455858B1 KR 20070099538 A KR20070099538 A KR 20070099538A KR 20070099538 A KR20070099538 A KR 20070099538A KR 101455858 B1 KR101455858 B1 KR 101455858B1
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- control channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The present invention relates to a method and apparatus for transmitting an uplink control channel response channel for a downlink control channel in an orthogonal frequency division multiple access (OFDM) mobile communication system. A method according to an embodiment of the present invention is a method of transmitting an uplink control channel response channel in an orthogonal frequency division multiple access (OFDM) mobile communication system. The method includes receiving a downlink control channel for data demodulation and a data to be demodulated Determining whether to transmit the uplink control channel response channel based on the amount of a control channel element used by the downlink control channel, determining whether the downlink control channel and the data channel are successfully demodulated, And transmitting an uplink control channel response channel for the downlink control channel and the data channel.
(OFDMA), an acknowledgment channel, a physical uplink response channel (PUACKCH), a physical downlink control channel (PDCCH)
Description
The present invention relates to a method and apparatus for transmitting an uplink control channel response channel for a downlink control channel in an orthogonal frequency division multiple access (OFDM) mobile communication system.
2. Description of the Related Art In recent mobile communication systems, orthogonal frequency division multiplexing (OFDM) has been actively studied as a useful method for high-speed data transmission in a wired / wireless channel. The OFDM scheme is a scheme for transmitting data using a multi-carrier. The OFDM scheme converts a serial symbol sequence in parallel and converts the serial symbols into a plurality of subcarriers (orthogonal subcarriers) Carrier Modulation (MCM) scheme, which modulates and transmits signals on a plurality of subcarriers, that is, a plurality of subcarrier channels.
A system employing such a multi-carrier modulation scheme was first applied to military communications in the late 1950's, and an OFDM scheme that overlaps a plurality of orthogonal subcarriers started to develop from the 1970s, but the implementation of orthogonal modulation between multi- Because it was very difficult, there was a limit to practical system application. However, in 1971, Weinstein et al. Announced that it was possible to efficiently process using a DFT (Discrete Fourier Transform) as a modulation and demodulation method using the OFDM scheme, and the technology development for the OFDM scheme rapidly developed. Also, since a guard interval is used and a method of inserting a cyclic prefix (CP) symbol into a guard interval is known, it is possible to further reduce the adverse effect of the system on multipath and delay spread .
Due to such technological advances, the OFDM technique can be applied to a digital audio broadcasting system such as Digital Audio Broadcasting, Digital Video Broadcasting, Wireless Local Area Network (WLAN), and Wireless Asynchronous Transfer Mode And is widely applied to digital transmission technology. That is, the OFDM scheme can not be widely used due to hardware complexity. Recently, a fast Fourier transform (FFT) and an inverse fast Fourier transform (IFFT) And so on). The OFDM scheme is similar to a conventional frequency division multiplexing (OFDM) scheme. However, the OFDM scheme maintains orthogonality between a plurality of subcarriers, and transmits the orthogonality of the subcarriers. . Also, the OFDM scheme is characterized in that it has a high frequency use efficiency and is resistant to multi-path fading, thereby achieving optimal transmission efficiency in high-speed data transmission.
Another advantage of the OFDM scheme is that it uses the frequency spectrum in an overlapping manner, which is efficient in frequency use, strong in frequency selective fading, robust against multipath fading, and inter-symbol interference , Hereinafter referred to as "ISI"), and it is possible to easily design an equalizer structure in hardware. Also, the OFDM scheme has an advantage of being strong against impulse noise, and can be utilized in a communication system structure.
On the other hand, HARQ is one of important techniques used for increasing the reliability of data transmission and data throughput in a packet-based mobile communication system. The HARQ refers to a technique that combines ARQ (Automatic Repeat Request) technology and FEC (Forward Error Correction). ARQ is a technique widely used in wired and wireless data communication systems in which a transceiver assigns a serial number to data packets transmitted according to a predetermined promised method and transmits the data to a data receiver, Quot; refers to a technique that achieves reliable data transmission by requiring the number to be retransmitted to the transmitter. In the above, FEC refers to an error occurring in an environment such as noise or fading that occurs in a data transmission / reception process by adding a redundant bit according to a predetermined rule to data to be transmitted, such as convolutional coding or turbo coding, And to demodulate the originally transmitted data. In a system using HARQ combined with the above two techniques, i.e., ARQ and FEC, the data receiver performs a predetermined FEC inverse process on the received data, and determines whether there is an error through a CRC (Cyclic Redundancy Check) Can be determined. If there is no error, an ACK (Acknowledgment) is fed back to the transmitter to cause the transmitter to transmit the next data packet. On the other hand, if it is determined that there is an error in the received data as a result of the CRC check, the transmitter retransmits the previously transmitted packet by feeding back NACK (Non-Acknowledgment).
FIG. 1 is a diagram illustrating an example of a general HARQ scheme. In FIG. 1, a horizontal axis represents a time axis.
Reference numeral 101 denotes an initial transmission. In FIG. 1, the data channel indicates a channel through which data is actually transmitted. The receiver receiving the data transmission of the reference numeral 101 attempts to demodulate the data channel. If the data transmission is not demodulated successfully, the NACK is fed back to the data transmitter. Upon receiving a NACK such as the
Hereinafter, each transmission for transmitting the same information represented by data transmissions that transmit the same information, that is, reference numerals 101, 103, and 105, will be referred to as a subpacket. The receiver receiving the data transmission of the reference numeral 103 performs a combination according to a predetermined rule and the initial transmission data received at the reference numeral 101 for the retransmission of the reference numeral 103, Attempt to demodulate the channel. If it is determined that the data transmission has not been successfully demodulated through the CRC for the data channel, the NACK is fed back to the data transmitter as indicated by
The data channel transmitter having received the NACK of the
Therefore, the initial transmission of the reference numeral 101 and the first retransmission of 103 and the data channel of the second retransmission reference 105 all transmit the same information. The receiver receiving the second retransmission data of the reference number 105 combines the initial transmission of the reference numeral 101, the first retransmission of the reference numeral 103, and the third retransmission of the reference numeral 105 according to a predetermined rule And performs demodulation of the data channel by using it. It is assumed that the data transmission has been successfully demodulated through the CRC for the data channel. In this case, the data receiver feeds back the ACK 106 to the data transmitter. Upon receiving the ACK of
In order to support HARQ as described above, ACK / NACK feedback is transmitted in the data receiver, and a channel for transmitting the ACK / NACK is referred to as ACKCH.
FIG. 2 shows a relationship between a physical downlink control channel (PDCCH) structure and a physical uplink control channel (PUCCH). The PDCCHs 202 to 204 are made up of control channel elements (CCEs) 201, and one PDCCH can use one or several CCEs. As shown in FIG. 2, each PDCCH can be used for downlink grant (DL GRANT). That is, it can be used for resource allocation of a physical downlink shared channel (PDSCH). The UE having allocated the PDSCH resource through the PDCCH transmits ACK / NACK information (ACK / NACK) information through a response channel (ACKCHCH) 206 resource mapped to the first CCE of each PDCCH to the data transmitted through the allocated PDSCH resource . The ACKCH resource allocated in the above manner is transmitted to a Physical Uplink Acknowledge Channel (PUACKCH) 208 used as a response of the PDSCH. Here, on / off keying (OOK) can be used as a method of transmitting an ACK / NACK of the PUACKCH, and the ACK may be set to transmit a signal and the NACK may not be set to be transmitted. The base station uses Non Coherent Detection when receiving. The reason that the PDCCH has one or several CCEs can transmit different length information according to the nature of the DL GRANT and does not use the same length, thereby increasing the efficiency of downlink resources. However, when transmitting an uplink ACK / NACK, it is assumed that an ACKCH resource is allocated to each CCE of a PDCCH, and an ACKCH resource must be allocated equal to the number of CCEs. However, when the PDCCH has a plurality of CCEs, some of the uplink ACKCH resources mapped to the CCE may not be used, thereby reducing resource efficiency.
Therefore, one aspect of the present invention provides a method and apparatus for efficiently using uplink resources in an orthogonal frequency division multiple access (OFDM) mobile communication system.
According to another aspect of the present invention, there is provided a method and an apparatus for transmitting an uplink control channel response channel for a downlink control channel in an orthogonal frequency division multiple access (OFDM) mobile communication system.
A method according to an embodiment of the present invention is a method for transmitting an uplink control channel response channel for a downlink control channel in a mobile communication system using an orthogonal frequency division multiple access scheme, Determining whether the demodulation is successful by demodulating the downlink control channel and the downlink shared channel; determining whether the number of the control channel elements or the resource And a physical uplink control channel response channel (PUCACKCHCH) as an acknowledgment channel resource mapped in advance to the control channel element or the resource block according to the demodulation success of the downlink control channel and the downlink shared channel, ) Information indicating the success or failure of the downlink control channel demodulation And transmitting the data.
In an apparatus for transmitting an uplink control channel response channel for a downlink control channel in an orthogonal frequency division multiple access (OFDM) mobile communication system, an apparatus according to an exemplary embodiment of the present invention includes a control channel element Determines the number of resource blocks included in the number of control channel elements or the number of resource blocks included in the downlink shared channel, demodulates the downlink control channel and the downlink shared channel to determine demodulation success, And a physical uplink control channel response channel (PUCACKCH) is allocated as an acknowledgment channel resource mapped in advance to the control channel element or the resource block according to whether demodulation succeeds in the downlink control channel and the downlink shared channel. And controls the transmission unit to transmit the downlink control channel demodulation success information .
In another aspect of the present invention, there is provided a method of receiving an uplink control channel response channel in a mobile communication system using an orthogonal frequency division multiple access scheme, the method comprising: Determining whether there are a plurality of resource blocks included in the shared channel, and determining whether there are a plurality of resource blocks in the physical uplink control channel response channel (PUCACKCH) and / And determining whether to transmit the next packet according to whether the link response channel (PUACKCH) is ACK.
Another apparatus according to an embodiment of the present invention is a base station for receiving an uplink control channel response channel in a mobile communication system of an orthogonal frequency division multiple access scheme, the base station comprising: a plurality of control channel elements included in a downlink control channel; And determines whether the number of the resource blocks included in the downlink shared channel is plural or not. If the number of the control channel elements or the number of the resource blocks is plural, the physical uplink control channel response channel (PUCACKCH) and / And a control unit for determining whether to transmit the next packet according to whether the link response channel (PUACKCH) is ACK.
In the present invention, ACK / NACK information for a PDCCH is transmitted according to the number of CCEs used in one PDCCH transmission or the number of RBs allocated to a PDSCH in an orthogonal frequency division multiple access (OFDM) mobile communication system, It is possible to increase downlink power efficiency or to increase the efficiency of downlink resources by transmitting a new packet when PDCCH transmission fails.
In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.
3A is a diagram illustrating a method of transmitting a physical uplink control channel response channel according to an embodiment of the present invention.
3A, a remaining ACKCH resource except a PUACKCH (Physical Uplink Acknowledge Channel) used as an ACKCH for a PDSCH among uplink ACKCHs allocated based on a downlink CCE is used as a physical uplink control channel response channel Uplink Control Channel Acknowledge Channel: PUCACKCH).
3A,
3B is a diagram illustrating a method of transmitting a physical uplink control channel response channel according to another embodiment of the present invention.
FIG. 3B illustrates a PUCACKCH resource allocation method in the case of configuring an uplink ACKCH based on a resource block (RB) of a PDSCH allocated from a PDCCH according to another embodiment of FIG. 3A described above. Each PDSCH is composed of one or more RBs, and each RB has
4 is a view illustrating an operation of a UE according to whether a PDSCH and a PDCCH are successfully demodulated according to an embodiment of the present invention.
PUACKCH and PUCACKCH are control channels for transmitting ACK / NACK information of PDSCH and PDCCH, respectively, and BPSK, QPSK and OOK can be used for modulation and demodulation. When BPSK or QPSK is used in the modulation / demodulation scheme, the NACK of the PDSCH, which is the ACK / NACK information for the PDSCH, is constellated into one modulation symbol according to the modulation scheme. That is, the PDCCH as a control channel succeeds in demodulation, Which means that they did not succeed. Therefore, in this case, since the ACK / NACK information for the PDSCH includes information on the demodulation success of the PDCCH, a PUCACKCH having ACK / NACK information for the PDCCH is not required. However, when the OOK modulation / demodulation scheme is used for ACK / NACK transmission of the PDSCH and the NACK information of the PDSCH is mapped to OFF in which the signal is not transmitted, the base station receiving the ACK / NACK of the PDSCH can not normally demodulate the PDCCH and receive the PDSCH It is impossible to distinguish whether the PDSCH has been successfully demodulated or the PDSCH demodulation has failed. Therefore, the PUCACKCH having the ACK / NACK information for the PDCCH transmits the demodulation success or failure to the PDCCH, thereby enhancing the reliability of the PDCCH sent from the base station, thereby facilitating the resource recovery of the PDSCH indicated by the PDCCH when the PDCCH fails. In addition, the power used for the initial transmission of the PDCCH can be reduced.
The operation of the UE according to the values of PUACKCH and PUCACKCH when the OOK modulation / demodulation scheme is used will be described with reference to FIG. The base station transmits the DL GRANT using the
In the first case, the PDSCH demodulation fails, that is, when the PUCACKCH is NACK and the PDCCH is failed, that is, when the PUCACKCH is NACK, the UE does not transmit anything according to the OOK modulation / demodulation scheme. In the second case, if the PDSCH fails to demodulate and the PDCCH succeeds in demodulation, the terminal transmits only the ACK of the PUCACKCH so that the PDCCH demodulates successfully to the base station, and the PDSCH demodulation fails and the retransmission can be instructed. In the third case, the PDSCH succeeds in demodulation and the PDCCH fails in demodulation. In this case, the UE does not perform any operation. That is, since the PDCCH demodulation has failed and the DL GRANT transmitted through the PDCCH is not received, it can be said that it is the same as the first case. In the fourth case, the PDSCH succeeds in demodulation, and if the PDCCH succeeds in demodulation, the UE transmits a PUACHCK ACK to the PDSCH to inform the base station that the PDCCH and the PDSCH demodulation are successful. That is, the successful demodulation of the PDSCH implies that the demodulation of the PDCCH has been implicitly performed. Therefore, it is not necessary to separately transmit the ACK / NACK information for the PDCCH. As for the above four cases, there is no case where PUACKCH and PUCACKCH are simultaneously transmitted. By not simultaneously transmitting the two channels, the single carrier characteristic can be maintained in the uplink, and the reliability of the control channel can be increased by using ACK / NACK for the PDSCH and the PDCCH.
5 is a block diagram illustrating an apparatus for transmitting a PUCACKCH and a PUCACKCH according to an embodiment of the present invention. The demodulation success or failure of the PDCCH is transmitted to the
FIG. 6 is a control flowchart for transmitting a PUCACKCH and a PUACKCH according to an embodiment of the present invention.
The UE checks in
7 is a block diagram of an apparatus for receiving PUCACKCH and PUACKCH according to an embodiment of the present invention.
The
FIG. 8 is a control flow chart for PUCACKCH and PUACKCH reception according to an embodiment of the present invention.
In
1 is a diagram illustrating an example of a general HARQ;
2 is a diagram showing the relationship between the structure of the PDCCH and the PUCCH,
FIG. 3A illustrates a physical uplink control channel response channel transmission method according to an embodiment of the present invention,
FIG. 3B illustrates a physical uplink control channel response channel transmission method according to another embodiment of the present invention,
4 is a diagram illustrating an operation of a UE according to whether a PDSCH and a PDCCH are successfully demodulated according to an embodiment of the present invention.
5 is a block diagram of a transmitting apparatus for transmitting a PUACKCH and a PUCACKCH according to an embodiment of the present invention.
FIG. 6 is a control flow chart for PUCACKCH and PUACKCH transmission according to an embodiment of the present invention,
FIG. 7 is a block diagram of a PUCACKCH and a PUACKCH receiving apparatus according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating a PUCACKCH and a PUACKCH reception according to an embodiment of the present invention. FIG.
Claims (20)
Priority Applications (2)
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KR20070099538A KR101455858B1 (en) | 2007-10-02 | 2007-10-02 | Method and apparatus for transmission of uplink control channel acknowledgement channel for downlink control channel in mobile communication systems using orthogonal frequency division multiple access |
PCT/KR2008/005782 WO2009045048A2 (en) | 2007-10-02 | 2008-10-01 | Method and apparatus for transmission of uplink control channel acknowledgement channel for downlink control channel in ofdma mobile communication system |
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KR20070099538A KR101455858B1 (en) | 2007-10-02 | 2007-10-02 | Method and apparatus for transmission of uplink control channel acknowledgement channel for downlink control channel in mobile communication systems using orthogonal frequency division multiple access |
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CN101873706A (en) * | 2009-04-24 | 2010-10-27 | 北京三星通信技术研究有限公司 | Method for feeding back identified/unidentified message in multi-carrier system |
US8995364B2 (en) | 2009-07-16 | 2015-03-31 | Lg Electronics Inc. | Method in which a receiver transmits control information in a wireless communication system |
KR101799272B1 (en) | 2010-02-03 | 2017-11-20 | 엘지전자 주식회사 | Apparatus and method of transmitting control information in wireless communication system |
US9112694B2 (en) | 2010-02-23 | 2015-08-18 | Lg Electronics Inc. | Method and device for transmitting uplink acknowledgement information in a wireless communication system supporting multiple carriers |
CN102237992B (en) * | 2010-04-30 | 2014-12-10 | 北京三星通信技术研究有限公司 | Method for feeding back data receiving status |
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KR20050044219A (en) * | 2003-11-07 | 2005-05-12 | 삼성전자주식회사 | Method for allocatting uplink feedback message resource in broadband wireless access communication system |
KR20050087947A (en) * | 2004-02-27 | 2005-09-01 | 삼성전자주식회사 | Method and apparatus for transmitting channel quality information in orthogonal frequency division multiple communication system |
KR20070080191A (en) * | 2006-02-06 | 2007-08-09 | 삼성전자주식회사 | Method for transmitting of acknowledgements to hybrid arq packets in ofdma system and transmitter/receiver therefor |
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KR100909527B1 (en) * | 2002-11-04 | 2009-07-27 | 삼성전자주식회사 | Turbo Decoding Time Control Method in High Speed Packet Data Communication System |
KR100546608B1 (en) * | 2003-08-27 | 2006-01-26 | 엘지전자 주식회사 | Method for controlling power in communication system |
EP1557967B1 (en) * | 2004-01-22 | 2008-03-26 | Matsushita Electric Industrial Co., Ltd. | Method of HARQ retransmission timing control |
EP1832025A4 (en) * | 2004-12-27 | 2011-01-05 | Lg Electronics Inc | Supporting hybrid automatic retransmission request in orthogonal frequency division multiplexing access radio access system |
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KR20050044219A (en) * | 2003-11-07 | 2005-05-12 | 삼성전자주식회사 | Method for allocatting uplink feedback message resource in broadband wireless access communication system |
KR20050087947A (en) * | 2004-02-27 | 2005-09-01 | 삼성전자주식회사 | Method and apparatus for transmitting channel quality information in orthogonal frequency division multiple communication system |
KR20070080191A (en) * | 2006-02-06 | 2007-08-09 | 삼성전자주식회사 | Method for transmitting of acknowledgements to hybrid arq packets in ofdma system and transmitter/receiver therefor |
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