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WO2009045048A2 - Procédé et appareil de transmission de canal d'accusé de réception de canal de commande liaison montante au canal de commande liaison descendante dans un système de communications mobile ofdma - Google Patents

Procédé et appareil de transmission de canal d'accusé de réception de canal de commande liaison montante au canal de commande liaison descendante dans un système de communications mobile ofdma Download PDF

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Publication number
WO2009045048A2
WO2009045048A2 PCT/KR2008/005782 KR2008005782W WO2009045048A2 WO 2009045048 A2 WO2009045048 A2 WO 2009045048A2 KR 2008005782 W KR2008005782 W KR 2008005782W WO 2009045048 A2 WO2009045048 A2 WO 2009045048A2
Authority
WO
WIPO (PCT)
Prior art keywords
control channel
channel
demodulation
downlink
downlink control
Prior art date
Application number
PCT/KR2008/005782
Other languages
English (en)
Other versions
WO2009045048A3 (fr
Inventor
Jae-Chon Yu
Jun-Young Lee
Yeon-Ju Lim
Dae-Gyun Kim
Joon-Young Cho
Hwan-Joon Kwon
Ju-Ho Lee
Youn-Hyoung Heo
Original Assignee
Samsung Electronics Co., Ltd.
Kim, Dong-Hee
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co., Ltd., Kim, Dong-Hee filed Critical Samsung Electronics Co., Ltd.
Publication of WO2009045048A2 publication Critical patent/WO2009045048A2/fr
Publication of WO2009045048A3 publication Critical patent/WO2009045048A3/fr

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Classifications

    • 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 signalling, i.e. of overhead other than pilot signals
    • 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
    • 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—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • 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) or DMT
    • 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

Definitions

  • the present invention relates to a method and an apparatus for transmitting an uplink control channel acknowledgement channel for a downlink control channel in a mobile communication system of an Orthogonal Frequency Division Multiple Access (OFDMA) scheme.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • OFDM Orthogonal Frequency Division Multiplexing
  • MCM Multiple Carrier Modulation
  • the OFDM scheme has been widely used for digital data communication technologies such as digital audio broadcasting (DAB), digital TV broadcasting, wireless local area network (WLAN), and wireless asynchronous transfer mode (WATM). That is to say, although hardware complexity was an obstacle to widespread implementation of the OFDM scheme, recent advances in digital signal processing technology including fast Fourier transform (FFT) and inverse fast Fourier transform (IFFT) have enabled implementation of the OFDM scheme.
  • FFT fast Fourier transform
  • IFFT inverse fast Fourier transform
  • the OFDM scheme similar to an existing Frequency Division Multiplexing (FDM) scheme, boasts of optimum transmission efficiency in high-speed data transmission because it transmits data on subcarriers, while maintaining orthogonality among them. The optimum transmission efficiency is further attributed to good frequency use efficiency and robustness against multipath fading in the OFDM scheme.
  • the OFDM scheme reduces effects of intersystem interference (ISI) by use of guard intervals and enables design of a simple equalizer hardware structure. Furthermore, because the OFDM scheme is robust against impulse noise, it is increasingly popular in communication systems.
  • ISI intersystem interference
  • a Hybrid Automatic Repeat reQuest (HARQ) scheme is one of important techniques used in order to improve data throughput and reliability of data transmission in a packet-based mobile communication system.
  • the HARQ corresponds to a combination of the techniques of Automatic Retransmission Request (ARQ) and Forward Error Correction (FEC).
  • ARQ Automatic Retransmission Request
  • FEC Forward Error Correction
  • a transmitter transmits data packets with sequence numbers attached to the data packets according to a pre-promised scheme, and a receiver requests retransmission of a missing packet from among the received packets by using the sequence numbers, thereby achieving reliable data transmission.
  • each data packet is transmitted together with a redundant bit added thereto according to a predetermined rule, such as convolutional encoding or turbo encoding, so that the originally-transmitted data can be demodulated without noise or fading, which may occur during the data transmission/reception.
  • a predetermined rule such as convolutional encoding or turbo encoding
  • the receiver performs a Cyclic Redundancy Check (CRC) for data demodulated through a predetermined inverse FEC process, in order to determine if the data has an error.
  • CRC Cyclic Redundancy Check
  • the system using the HARQ feeds back an Acknowledgement (ACK) to the transmitter, so that the transmitter transmits a next data packet.
  • ACK Acknowledgement
  • NACK Non-Acknowledgement
  • FIG. 1 illustrates an example of a typical HARQ.
  • the horizontal axis corresponds to a time axis.
  • Reference numeral 101 indicates initial transmission.
  • the data channel in FIG. 1 refers to a channel through which data are actually transmitted.
  • a receiver having received a data packet transmitted by the initial transmission 101 demodulates the received data packet and performs a CRC so as to determine if the received data packet has an error during the demodulation.
  • the receiver feeds back an NACK to the transmitter in step 102.
  • the data channel transmitter Upon receiving the NACK 102, the data channel transmitter performs first retransmission 103 in relation to the initial transmission 101. Therefore, the initial transmission 101 and the first retransmission 103 carry the same information.
  • the initial transmission 101 and the first retransmission 103 carry the same information.
  • the same information may have different redundancies.
  • the same data packet transmitted in steps 101, 103 and 105 is called a "sub-packet."
  • the receiver Upon receiving the data packet by the first retransmission 103, the receiver combines the data packet of the first retransmission 103 with the data packet of the initial transmission 101 according to a predetermined rule and then demodulates the data channel by using the combined result. Through a CRC of the data channel during the demodulation, when the receiver determines that the transmitted data has not been correctly demodulated, the receiver feeds back an NACK 104 to the transmitter.
  • the data channel transmitter Upon receiving the NACK 104, the data channel transmitter performs second retransmission 105 after passage of a predetermined time interval from the time point of the first retransmission 103.
  • the data channels of the initial transmission 101, the first retransmission 103, and the second retransmission 105 carry the same information.
  • the receiver Upon receiving the data packet transmitted by the second retransmission 105, the receiver combines the data of the initial transmission 101, the data of the first retransmission 103, and the data of the second retransmission 105 with each other according to a predetermined rule, and then demodulates the data channel by using the combined data.
  • the receiver determines, by CRC for the data channel, that the transmitted data has been correctly demodulated, the receiver feeds back an ACK 106 to the transmitter.
  • the transmitter After receiving the ACK 106, the transmitter transmits a sub-packet of an initial transmission 107 for next data information together with a control channel.
  • the initial transmission 107 may be performed either immediately after the ACK 106 is received or after passage of a predetermined time interval from the reception of the ACK 106, based on a result of a predetermined scheduling.
  • the data receiver In order to support the HARQ as described above, the data receiver must feeds back an ACK/NACK.
  • a channel for transmission of the ACK/NACK is called an ACKCH.
  • FIG. 2 illustrates a structure of a Physical Downlink Control Channel (PDCCH) and a relation between a Physical Uplink Control Channel (PUCCH) and the PDCCH.
  • the PDCCHs include a plurality of Control Channel Elements (CCEs) 201, and each PDCCH can use one CCE or multiple CCEs.
  • each PDCCH can be used for Downlink grant (DL grant). That is, the PDCCH can be used for resource allocation of a Physical Downlink Shared Channel (PDSCH).
  • DL grant Downlink grant
  • PDSCH Physical Downlink Shared Channel
  • a User Equipment (UE) having been allocated resources of the PDSCH through the PDCCH transmits ACK/NACK information through an acknowledgement channel (ACKCH) resource 206 mapped to the first CC3 of each PDCCH for the transmitted data.
  • UE User Equipment
  • ACKCH acknowledgement channel
  • the ACKCH resource allocated in the manner described above is transmitted to a Physical Uplink Acknowledgement Channel (PUACKCH) 208, which is used as an ACK/NACK of the PDSCH.
  • PUACKCH Physical Uplink Acknowledgement Channel
  • OOK On/Off Keying
  • a Node B uses Non Coherent Detection for signal reception. Since the PDCCH has one CCE or multiple CCEs, it is possible to transmit information having different lengths according to the attribute of the DL grant. Use of different lengths can yield improvement in efficiency of the downlink resources.
  • the ACKCH resource is allocated to each CCE of the PDCCH in transmitting uplink ACK/NACK, it is required to allocate the same number of ACKCH resources as the CCEs.
  • the PDCCH has multiple CCEs, a part of the uplink ACKCH resources mapped to the CCEs may be unused, which may degrade the efficiency in use of the resources.
  • the present invention has been made to solve the above- mentioned problems occurring in the prior art, and the present invention provides a method and an apparatus for efficient use of uplink resource in a mobile communication system of an Orthogonal Frequency Division Multiple Access (OFDMA) scheme.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • the present invention provides a method and an apparatus for transmitting an uplink control channel acknowledgement channel for a downlink control channel in a mobile communication system of an OFDMA scheme.
  • a method of transmitting an uplink control channel acknowledgement channel for a downlink control channel in a mobile communication system of an Orthogonal Frequency Division Multiple Access (OFDMA) scheme including the steps of: determining how many control channel elements the downlink control channel includes or how many resource blocks a downlink shared channel includes; demodulating the downlink control channel and the downlink shared channel and determining if demodulation of the downlink control channel and the downlink shared channel is successful; and transmitting information on a success in demodulation of the downlink control channel through an uplink control channel acknowledgement channel by using acknowledgement channel resources mapped in advance to the resource blocks or the control channel elements, depending on success or failure in demodulation of the downlink control channel and the downlink shared channel and depending on if the downlink control channel includes multiple control channel elements or if the downlink shared channel includes multiple resource blocks.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • an apparatus for transmitting an uplink control channel acknowledgement channel for a downlink control channel in a mobile communication system of an OFDMA scheme including: a control unit for determining how many control channel elements the downlink control channel includes or how many resource blocks a downlink shared channel includes, demodulating the downlink control channel and the downlink shared channel, and determining if demodulation of the downlink control channel and the downlink shared channel is successful; and a transmitter for transmitting information on a success in demodulation of the downlink control channel through an uplink control channel acknowledgement channel by using acknowledgement channel resources mapped in advance to the resource blocks or the control channel elements, depending on success or failure in demodulation of the downlink control channel and the downlink shared channel and depending on if the downlink control channel includes multiple control channel elements or if the downlink shared channel includes multiple resource blocks.
  • a method of receiving an uplink control channel acknowledgement channel in a mobile communication system of an OFDMA scheme including the steps of: determining if the downlink control channel includes multiple control channel elements or if the downlink shared channel includes multiple resource blocks; and when the downlink control channel includes multiple control channel elements or if the downlink shared channel includes multiple resource blocks, determining whether to transmit a next packet, based on if a PUCACKCH and/or PUACKCH is an ACK.
  • an apparatus for receiving an uplink control channel acknowledgement channel in a mobile communication system of an OFDMA scheme including: a control unit for determining if the downlink control channel includes multiple control channel elements or if the downlink shared channel includes multiple resource blocks; and an HARQ controller for, when the downlink control channel includes multiple control channel elements or if the downlink shared channel includes multiple resource blocks, determining whether to transmit a next packet, based on if a PUCACKCH and/or PUACKCH is an ACK.
  • FIG. 1 illustrates an example of a typical HARQ
  • FIG. 2 illustrates a structure of a PDCCH and a relation between a PUCCH and the PDCCH
  • FIG. 3A illustrates a method for transmitting a Physical Uplink Control Channel Acknowledgement Channel (PUCACKCH) according to an embodiment of the present invention
  • FIG. 3B illustrates a method for transmitting a physical uplink control channel acknowledgement channel according to another embodiment of the present invention
  • FIG. 4 illustrates an operation of a UE based on success or failure in demodulation of a PDSCH and a PDCCH according to an embodiment of the present invention
  • FIG. 5 is a block diagram of an apparatus for transmitting a PUACKCH and a PUCACKCH in a UE transmitter according to an embodiment of the present invention
  • FIG. 6 is a flow chart illustrating a control when a UE transmitter transmits a PUCACKCH and a PUACKCH according to an embodiment of the present invention
  • FIG. 7 is a block diagram of an apparatus for receiving a PUACKCH and a PUCACKCH in a Node B receiver according to an embodiment of the present invention.
  • FIG. 8 is a flow chart illustrating a control when a Node B receiver receives a PUCACKCH and a PUACKCH according to an embodiment of the present invention.
  • FIG. 3A illustrates a method for transmitting a Physical Uplink Control Channel Acknowledgement Channel (PUCACKCH) according to an embodiment of the present invention.
  • PUCACKCH Physical Uplink Control Channel Acknowledgement Channel
  • the uplink ACKCHs are indicated by reference numerals 301 to 310.
  • ACK/NACKs for the PDSCHs are transmitted through PUACKCHl to PUACKCH6 311, 312, 314, 315, 317, and 320 by using ACKCHl 301, ACKCH2 302, ACKCH4 304, ACKCH5 305, ACKCH7 307, and ACKCHlO 310. Further, from among the resources that are not used for the PUACKCH, ACKCH3 313, ACKCH6 316, ACKCH8 318, and ACKCH9 319, which are connected to the CCEs included in the PDCCH, are used as PUCACKCHs 313, 316, 318, and 319.
  • the PDCCHl 323 uses a single CCE, that is, CCEl 321, and ACKCHl, which is an uplink ACKCH mapped to CCEl 321, is used as PUACKCHl for the PDSCH. Since there is no other ACKCH mapped to the PDCCHl, it is impossible to use the PUCACKCH for the PDCCH.
  • the PDCCH2 324 also uses CCE2 and CCE3, which are mapped to the uplink ACKCH2 and ACKCH3, respectively.
  • ACK/NACK information for the PDSCH2 of downlink which is not shown in the drawings, is transmitted to the ACKCH2 302 through the PUACKCH2 312, and ACK/NACK information for the PDCH is transmitted to the ACKCH3 303 through the PUCACKCH2 313.
  • a UE may transmit only one of the two channels, including the PUACKCH and the PUCACKCH, while implicitly transmitting a value of the other channel, instead of transmitting both of the two channels. This will be described below in more detail.
  • ACK/NACK information for the PDSCH may be transmitted to the ACKCH7 through the PUACKCH5
  • ACK/NACK information for the PDCCH may be transmitted by using either one of or both of the ACKCH8 and the ACKCH9.
  • the same method can be applied to a case of using a PUCACKCH in an RB-based ACKCH, which will be described below with reference to FIG. 3B.
  • FIG. 3B illustrates a method for transmitting a physical uplink control channel acknowledgement channel according to another embodiment of the present invention.
  • the method according to the embodiment shown in FIG. 3B corresponds to a PUSACKCH resource allocation method in a case of configuring uplink ACKCHs based on Resource Blocks (RBs) of the PDSCH allocated from the PDCCH.
  • RBs Resource Blocks
  • Each PDSCH includes one or more RBs, which have ACKCH resources 905 to 914 mapped to an uplink, respectively.
  • ACK/NACK for the PDSCH is transmitted through the PUACKCHl ⁇ PUACKCH6 by using the ACKCHl 905, ACKCH2 906, ACKCH4 908, ACKCH5 909, ACKCH7 911, and ACKCHlO 914.
  • the ACKCH3 907, ACKCH6 910, ACKCH8 912, and ACKCH9 913, which are connected to the RBs included in the PDSCH are used as PUCACKCHs.
  • the PDSCHl 902 since the PDSCHl 902 includes a single RB, which is RBl, and ACKCHl 905, which is a mapped uplink ACKCH, is used as a PUACKCHl 915 without another ACKCH mapped to the PDSCHl 902, it is impossible to use the PUCACKCH.
  • the PDSCH2 903 has RB2 and RB3, which are mapped to uplink ACKCH2 and ACKCH3, respectively.
  • ACK/NACK information for the PDSCH2 of a downlink is transmitted to the ACKCH2 906 through the PUACKCH2 916
  • ACK/NACK information for the PDCCH which is not shown in the drawings, is transmitted to the ACKCH3 907 through the PUCACKCH2 917.
  • the RB-based mapping as described above is not limited to each RB, and each uplink ACKCH resource may be mapped to an RB group including one or more RBs. The following description is based on ACKCH resource allocation to each RB.
  • FIG. 4 illustrates an operation of a UE based on success or failure in demodulation of a PDSCH and a PDCCH according to an embodiment of the present invention.
  • the PUACKCH and the PUCACKCH are control channels for transmitting ACK/NACK information of the PDSCH and the PDCCH, respectively, which may use Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), On Off Keying (OOK), etc. as a modulation/demodulation scheme.
  • BPSK Binary Phase Shift Keying
  • QPSK Quadrature Phase Shift Keying
  • OSK On Off Keying
  • a NACK of the PDSCH which is ACK/NACK information for the PDSCH
  • a modulation scheme which implies that demodulation of the PDCCH results in a success while demodulation of the PDSCH results in a failure.
  • ACK/NACK information for the PDSCH includes information on success or failure in demodulation of the PDCCH
  • a separate PUCACKCH having ACK/NACK information for the PDCCH is unnecessary.
  • the OOK modulation/demodulation scheme is used for ACK/NACK transmission of the PDSCH and NACK information of the PDSCH has been mapped to "OFF," which does not send a signal
  • a Node B receiving the ACK/NACK of the PDSCH cannot identify if it has failed in receiving the PDSCH due to failure in normal demodulation of the PDCCH or if it has failed in demodulation of the PDSCH in spite of a success in normal demodulation of the PDCCH.
  • a PUCACKCH having ACK/NACK information for the PDCCH can transmit information on success or failure in demodulation of the PDCCH, so as to enhance the reliability for the PDCCH sent from the Node B.
  • a Node B transmits a DL GRANT by using a PDCCH 401 and simultaneously transmits data through the PDSCH 402.
  • a UE determines, according to the OOK scheme based on success or failure in demodulation of the PDCCH and the PDSCH, whether to transmit the PUACKCH/PUCACKCH 403, as noted from Table 1 below.
  • the OOK modulation/demodulation scheme does not allow transmission of anything.
  • the UE transmits only an ACK for the PUCACKCH, so as to report the success in demodulation of the PDCCH and the failure in demodulation of the PDSCH and request retransmission.
  • the UE does not perform any operation.
  • the third case is equal to the first case, because the UE cannot receive a DL GRANT transmitted through the PDCCH due to failure in demodulation of the PDCCH.
  • the UE sends a PUACKCH, which is an ACK for the PDSCH, thereby notifying the Node B of the success in demodulation of both the PDCCH and the PDSCH. That is, the success in demodulation of the PDSCH implies success in demodulation of the PDCCH, and it is unnecessary to additionally transmit ACK/NACK information for the PDCCH.
  • FIG. 5 is a block diagram of an apparatus for transmitting a PUACKCH and a PUCACKCH in a UE transmitter according to an embodiment of the present invention.
  • Information on success or failure in demodulation of the PDCCH is transmitted through the PUCACKCH to a PUCCH transmitter 501, and information on success or failure in demodulation of the PDSCH is transmitted through the PUACKCH to a PUSCH transmitter 507.
  • These two types of information are delivered, together with information on if the PDCCH includes multiple CCEs or if the PDSCH includes multiple RBs 5 to a control unit 506.
  • the control unit 506 controls selection between transmission of the PUACKCH and the PUCACKCH by a selection unit 502.
  • the control information of the control unit 506 will be described later in more detail with reference to FIG. 6.
  • the selected ACK/NACK information is input, together with a signal generated from data of the PUSCH by a PUSCH transmitter 508, to an Inverse Fast Fourier Transform (IFFT) unit 503. Then, a Cyclic Prefix (CP) is inserted in the IFFTed signal by a CP inserter 504, and is then transmitted by a transmission unit 505.
  • IFFT Inverse Fast Fourier Transform
  • CP Cyclic Prefix
  • FIG. 6 is a flow chart illustrating a control when a UE transmitter transmits a PUCACKCH and a PUACKCH according to an embodiment of the present invention.
  • a UE identifies success or failure in demodulation of the PDCCH in step 601. If the demodulation is not proved to be a success, the UE proceeds to step 607, in which the UE does not send any acknowledgment signal, and then terminates the process. If the demodulation is successful, the UE proceeds to step 602, in which the UE determines if the PDCCH includes multiple CCEs or if the PDSCH includes multiple RBs. As a result of in step 602, when the PDCCH does not include multiple CCEs or the PDSCH does not include multiple RBs, the UE proceeds to step 604, in which the UE determines if demodulation of the PDSCH is successful or has failed.
  • step 607 When demodulation of the PDSCH is proved to have failed in step 604, the UE proceeds to step 607, in which the UE does not send any acknowledgment signal, and then terminates the process.
  • step 605 When demodulation of the PDSCH is proved to be a success in step 604, the UE proceeds to step 605, in which the UE transmits an ACK signal through a PUACKCH.
  • step 603 As a result of in step 602, when the PDCCH includes multiple CCEs or the PDSCH includes multiple RBs, the UE proceeds to step 603, in which the UE determines if demodulation of the PDSCH is successful or has failed.
  • step 603 When demodulation of the PDSCH is proved to be a success in step 603, the UE proceeds to step 605, in which the UE transmits an ACK signal through a PUACKCH, and then terminates the process.
  • step 606 When demodulation of the PDSCH is proved to have failed in step 603, the UE proceeds to step 606, in which the UE transmits an ACK signal through a PUCACKCH, and then terminates the process.
  • FIG. 7 is a block diagram of an apparatus for receiving a PUACKCH and a PUCACKCH in a Node B receiver according to an embodiment of the present invention.
  • An RF receiver 701 down-converts a transmitted RF signal and then outputs the down-converted signal. Then, a CP remover 702 removes a CP from the signal output from the RF receiver 701, and the CP-removed signal is transmitted through an Fast Fourier Transform (FFT) unit 703 to a PUCACKCH receiver 704, a PUACKCH receiver 705, and/or a PUSCH receiver 708.
  • FFT Fast Fourier Transform
  • a Node B transmits size information of the PDCCH related to the ACK/NACK information at the current reception time point, that is, information on the number of CCEs in the PDCCH or the number of PvBs in the PDSCH, to a control unit 709, and the control unit 709 controls a selection unit 706 by using this information.
  • the selection unit 706 selects an incoming signal of a PUCACKCH receiver 704 or a PUACKCH receiver 705, and then transmits the selected signal to an HARQ controller 707.
  • the information selected by the selection unit 706 is used in supporting the HARQ operation by the HARQ controller 707.
  • the control operation of the control unit 709 will be described below in detail with reference to FIG. 8.
  • FIG. 8 is a flow chart illustrating a control when a Node B receiver receives a PUCACKCH and a PUACKCH according to an embodiment of the present invention.
  • a Node B brings size information of a PDCCH from system information in step 801. That is, the Node B identifies information on the number of RBs of the PDSCH or the number of CCEs of the PDCCH related to the ACK/NACK information at the current receiving time point.
  • the Node B determines if the PDCCH includes multiple CCEs or if the PDSCH includes multiple RBs. As a result of the determination in step 802, when the PDCCH does not include multiple CCEs or the PDSCH does not include multiple RBs, the Node B proceeds to step 805, in which the Node B determines if the PUACKCH is an ACK.
  • the Node B proceeds to step 806, in which the Node B transmits a next sub-packet of the current packet through a PDSCH.
  • the Node B proceeds to step 807, in which the Node B transmits a new packet through a PDSCH.
  • the Node B proceeds to step 803, in which the Node B determines if the PUACKCH is an ACK.
  • the Node B proceeds to step 807, in which the Node B transmits a new packet through a PDSCH.
  • step 803 when the PUACKCH is not an ACK, the Node B proceeds to step 804, in which the Node B determines if the PUCACKCH is an ACK. As a result of the determination in step 804, when the PUCACKCH is an ACK, the Node B proceeds to step 806, in which the Node B transmits a next sub-packet of the current packet through a PDSCH.
  • step 807 the Node B transmits a new packet through a PDSCH.
  • the transmission of a new packet in step 807 is not required to be necessarily continuously performed, but can be performed with a predetermined time interval depending on a scheduling result by a Node B.
  • ACK/NACK information for the PDCCH is transmitted depending on the number of RBs allocated to a PDSCH or the number of CCEs used in transmission of one PDCCH. Therefore, the present invention can enhance downlink power efficiency through low power consumption at the time of initial PDCCH transmission, and can enhance downlink resource use efficiency through transmission of a new packet at the time of failure in transmission of the PDCCH.

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

Abstract

L'invention concerne un procédé et un appareil de transsmission d'un canal d'accusé de réception de canal de commande liaison montante au canal de commande liaison descendante dans un système de communications mobile d'un plan AFDMA. Grâce à ce procédé et à cet appareil, on peut réaliser une utilisation efficace de la ressource liaison montante dans un système de communications mobile OFDMA.
PCT/KR2008/005782 2007-10-02 2008-10-01 Procédé et appareil de transmission de canal d'accusé de réception de canal de commande liaison montante au canal de commande liaison descendante dans un système de communications mobile ofdma WO2009045048A2 (fr)

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KR20070099538A KR101455858B1 (ko) 2007-10-02 2007-10-02 직교 주파수 분할 다중 접속 방식의 이동통신 시스템에서하향링크 제어 채널에 대한 상향링크 제어 채널 응답 채널송신 방법 및 장치
KR10-2007-0099538 2007-10-02

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WO2009045048A2 true WO2009045048A2 (fr) 2009-04-09
WO2009045048A3 WO2009045048A3 (fr) 2009-06-18

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