WO2010058979A2 - Procédé de transmission d'informations de commande dans un système de communication mobile sans fil - Google Patents

Procédé de transmission d'informations de commande dans un système de communication mobile sans fil Download PDF

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Publication number
WO2010058979A2
WO2010058979A2 PCT/KR2009/006829 KR2009006829W WO2010058979A2 WO 2010058979 A2 WO2010058979 A2 WO 2010058979A2 KR 2009006829 W KR2009006829 W KR 2009006829W WO 2010058979 A2 WO2010058979 A2 WO 2010058979A2
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Prior art keywords
control information
information
uplink
transmitted
pucch
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PCT/KR2009/006829
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English (en)
Korean (ko)
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WO2010058979A3 (fr
Inventor
권영현
노민석
정재훈
한승희
Original Assignee
엘지전자 주식회사
곽진삼
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Application filed by 엘지전자 주식회사, 곽진삼 filed Critical 엘지전자 주식회사
Priority to US13/130,752 priority Critical patent/US8989169B2/en
Priority to JP2011534410A priority patent/JP2012507241A/ja
Priority to CN200980146858.6A priority patent/CN102224698B/zh
Priority to EP09827744.5A priority patent/EP2348658B1/fr
Publication of WO2010058979A2 publication Critical patent/WO2010058979A2/fr
Publication of WO2010058979A3 publication Critical patent/WO2010058979A3/fr

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H04L1/0004—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes applied to control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0067—Rate matching
    • H04L1/0068—Rate matching by puncturing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1664—Details of the supervisory signal the supervisory signal being transmitted together with payload signals; piggybacking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
    • 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
    • H04L27/2602—Signal structure
    • 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
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • 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
    • 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
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • 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
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • 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
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers

Definitions

  • the present invention relates to a wireless mobile communication system, and more particularly, to a method of transmitting control information.
  • the traffic channel environment may change with time. Since a specific communication method suitable for each traffic channel environment may be different, the base station needs to determine a specific communication method and deliver it to the UE over time through a downlink control channel. The terminal may transmit control information necessary for the base station to determine a specific communication scheme through an uplink control channel.
  • 3GPP LTE 3 rd Generation Project Partnership Long Term Evolution
  • DFT-S-OFDM Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing
  • This method dramatically reduces the cubic metric (Cubic Metric) or peak-to-average power ratio (PAPR) of the transmitted signal, but the disadvantage is that the transmitted signal is transmitted only through consecutive bands in the frequency domain.
  • PAPR peak-to-average power ratio
  • the scheduling permission, and ambiguity may occur depending on the type of the control channel.
  • the base station performs blind detection because the base station cannot determine this.
  • CQI channel quality information
  • the present invention relates to a method for generating a signal while correcting such an error phenomenon.
  • the present invention proposes a method for reducing transmission error rate and improving capacity in wireless mobile communication.
  • a method for transmitting control information in a terminal of a wireless mobile communication system using a plurality of uplink carriers may include: multiplexing first control information allocated to a first uplink control channel and second control information allocated to a second uplink control channel; And transmitting the multiplexed first control information and second control information through an uplink channel assigned to any one of the plurality of uplink carriers.
  • the first uplink control channel and the second uplink control channel may be allocated to different uplink carriers, respectively.
  • the first uplink control channel and the second uplink control channel may be assigned to the same uplink carrier.
  • the terminal uses one or more single carrier-frequency division multiple access (SC-FDMA) signals or a clustered SC-FDMA (SC-FDMA).
  • SC-FDMA single carrier-frequency division multiple access
  • SC-FDMA clustered SC-FDMA
  • said uplink channel is an uplink control channel.
  • the multiplexing may include a modulation class corresponding to a length of the generated bit string, the bit string generated by sequentially arranging one or more bits representing the first control information and one or more bits representing the second control information. And modulating accordingly.
  • the modulation class corresponding to the length of the generated bit string is QPSK
  • the modulation class corresponding to the length of the generated bit string is If 8PSK and the generated bit string is 4 bits, the modulation class corresponding to the length of the generated bit string is 16QAM.
  • the first control information is disposed in the bit resistant to the propagation error in the generated bit string.
  • the bit resistant to the propagation error is the Most Significant Bit (MSB) of the generated bit string.
  • MSB Most Significant Bit
  • said uplink control channel is comprised of a plurality of subsets, each subset is each comprised of one or more SC-FDMA symbols, and said first control information is one of said plurality of subsets. Mapped to a first subset, wherein the second control information is mapped to a second subset of the plurality of subsets.
  • the number of pilot signals assigned to the first subset is the number of pilot signals assigned to the second subset. More than
  • the first control information and the second control information each include one or more of ACK, NACK, Scheduling Request (SR), and CQI.
  • a method for transmitting control information in a terminal of a wireless mobile communication system using SC-FDMA includes simultaneously transmitting control information through both an uplink control channel and an uplink common channel.
  • control information is ACK or NACK information, respectively.
  • control information is each CQI.
  • control information is RI.
  • said control information is each a measurement of a downlink carrier.
  • the measurement value may be a CSI RS (Channel Status Information Reference Signal) measurement or a DM RS (DeModulation Reference Signal) measurement.
  • control information is measured values of adjacent cells, respectively.
  • the measured value may be a CSI RS measurement or a DM RS measurement.
  • the control information is a timing measurement of each adjacent cell.
  • the timing measurement value may be a measurement value from a position RS, a synchronization channel, a CSI RS, a DM RS, or the like.
  • said CQI comprises first information and second information.
  • said first information is transmitted only through said uplink control channel and said second information is transmitted only through said uplink common channel.
  • said first information is a PMI and said second information is a wideband CQI.
  • said first information is a wideband CQI and said second information is a delta CQI.
  • the first information is CQI or Precoding Matrix Index (PMI) and the second information is rank information (RI).
  • PMI Precoding Matrix Index
  • RI rank information
  • said first information is RI and said second information is CQI or PMI.
  • said first information is feedback to a serving cell and said second information is feedback to a cooperating cell.
  • said first information is feedback for a first carrier and said second information is feedback for a second carrier.
  • the wireless mobile communication method according to the present invention has the effect of reducing transmission error rate and improving capacity.
  • 1 illustrates an example of resource allocation when a PUCCH and a PUSCH are used together.
  • FIG. 2 shows a case of using four downlink carriers and two uplink carriers as an example of carrier combining.
  • FIG. 3 illustrates a general processing structure used to transmit a message on a PUCCH for explaining the present invention.
  • FIG. 4 illustrates an example of a subset of OFDM symbols for delivering a plurality of messages in an embodiment according to the present invention.
  • FIG. 5 is a flowchart illustrating a method for transmitting control information by a terminal of a wireless mobile communication system using a plurality of uplink carriers according to an embodiment of the present invention.
  • FIG. 6 is a flowchart illustrating a method for transmitting control information by a terminal of a wireless mobile communication system according to another embodiment of the present invention.
  • a wireless communication system is provided for providing various communication services such as voice and packet data.
  • a base station (BS) usually refers to a fixed station that communicates with a user equipment (UE), and also refers to a node-B, a base transceiver system (BTS). May be called an access point.
  • a mobile station (MS) may be fixed or mobile and may be referred to as a user equipment (UE), a user terminal (UT), a subscriber station (SS), or a wireless device.
  • FIG. 1 illustrates an example of resource allocation when a physical uplink control channel (PUCCH) and a physical uplink shared channel (PUSCH) are used together.
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • FIG. 1 shows a set of uplink carriers including uplink carriers, that is, carrier X, carrier Y, and carrier Z, wherein each box (shown in FIG. boxes, for example reference numerals 101 and 102, represent one slot each on the time axis. Two slots constitute one subframe. That is, the dotted line region 109 of FIG. 1 represents one subframe on the time axis.
  • the PUCCH A1 103 shown in FIG. 1 forms one PUCCH with the PUCCH A2 108
  • the PUCCH B1 105 forms another PUCCH with the PUCCH B2 106
  • the PUSCH C1 104 together with the PUSCH C2 107 form one PUSCH.
  • the PUSCH C1 104 and the PUSCH C2 107 forming the PUSCH are separated from each other on the frequency axis, thereby obtaining a frequency diversity effect.
  • the same is true for the PUCCH. That is, a diversity effect can be obtained by frequency hopping performed for each slot for one channel.
  • the resource allocation as shown in FIG. 1 may be applied to both a single carrier and a multicarrier, and a mixture of a control channel and a traffic channel is also applied to a multicarrier.
  • the present invention focuses on the contents of the uplink control channel (PUCCH) and uplink traffic channel (PUSCH) of 3GPP LTE.
  • the present invention can be applied to not only 3GPP LTE system but also to all systems including control information transmitted in a traffic channel.
  • the number of PUCCH may be one or more, and the present invention may also be applied to a carrier aggregation in which the number of PUSCH may also be one or more.
  • Carrier combining refers to a case where a plurality of uplink carriers are combined with one or more downlink carriers or a plurality of downlink carriers are combined with one or more uplink carriers.
  • FIG. 2 shows a case of using four downlink carriers 201, 202, 203, and 204 and two uplink carriers 205 and 206 as an example of carrier combining.
  • two downlink carriers are combined with one uplink carrier.
  • the downlink 1st carrier 201 and the downlink 2nd carrier 202 are combined with the uplink 1st carrier 205, and the downlink 3rd carrier 203 and the downlink 4th carrier 204 Is combined with uplink carrier 2 (206).
  • a downlink signal may be transmitted to the mobile station using the uplink 1 carrier 205 through the downlink 1 carrier 201 or the downlink 2 carrier 202, and the uplink 2 carrier (
  • a downlink signal may be transmitted via downlink carrier 3 (203) or downlink carrier 4 (204).
  • the control channel transmission scheme is preferably designed to satisfy QoS that can be guaranteed first.
  • the error probability that the control channel should have is designed to be very low, for example, in the range of 0.001 to 0.01.
  • the error probability is set as high as 10 ⁇ 20% in order to increase the throughput of the system. In this case, the optimal throughput of the system can be obtained. Therefore, considering that the error probability required for the control channel and the error probability required for the traffic channel are more than 100 times different, the method of simply moving the control signal to the traffic channel and transmitting the signal itself is the system QoS and signal. There is a problem that can not secure reach.
  • the PUCCH can be used for other purposes. Specifically, since the content that is supposed to be transmitted through the PUCCH resource intended for use by a specific terminal is allocated to the PUSCH, this PUCCH resource is not used. This can be designed to be able to allocate the unused PUCCH resources to other terminals.
  • the UE when the UE receives downlink traffic (data or command) from the base station and transmits a response thereto by using PUCCH ACK / NACK, when the UE further receives a PUSCH resource capable of transmitting traffic.
  • the ACK is a signal for feedback that the second device was successfully received when a specific signal transmitted by the first device of the wireless mobile communication system to the second device of the wireless mobile communication system was successfully received by the second device. to be.
  • the NACK is a signal for feedback that the second device did not receive successfully when the above specific signal is not properly received at the second device.
  • the protocol ambiguity does not occur because the PUSCH transmission format that the base station expects to receive and the PUSCH transmission format transmitted by the terminal are the same.
  • the terminal does not properly decode downlink allocation information (PDCCH) transmitted by the base station, the terminal has no reason to send an ACK / NACK, and thus the PUSCH transmission format and the terminal that the base station expects to receive The PUSCH transmission format to be transmitted is different. In this case, the protocols in the physical layer do not match.
  • PDCCH downlink allocation information
  • Method A-1 In Method A-1 according to the present invention, the UE does not transmit ACK / NACK through the PUSCH at all, and the ACK / NACK is transmitted through the PUCCH. In this case, there is no reason for the interpretation of the PUSCH to be different between the terminal and the base station. In this case, the ACK / NACK is transmitted through the PUCCH, and the base station separately processes the ACK / NACK. This avoids problems with the downlink / uplink protocols. In a system in which a plurality of downlink carriers or a plurality of uplink carriers are used, for example, in an LTE-Advanced system, a plurality of ACK / NACK information for downlink data received through each downlink carrier is required.
  • ACK / NACK transmission is always made through the PUCCH.
  • individual ACK / NACK may be independently transmitted through the PUCCH of each uplink carrier.
  • ACK / NACK on the plurality of PUCCH resources by joint coding of the plurality of PUCCHs.
  • the bits can be bundled in a bundle.
  • a good channel among a plurality of PUCCH channels may be selected to transmit ACK / NACK information.
  • the ACK / NACK information transmitted by selecting a good channel among a plurality of PUCCH channels may be information in which a plurality of ACK / NACK bits are bundled as described above.
  • the ACK / NACK PUCCH may be transmitted through the PUCCH, which is an independent control information transmission channel.
  • ACK / NACK information is unconditionally transmitted through a PUSCH.
  • Method A-2 In Method A-2 according to the present invention, a UE transmits ACK / NACK through a PUCCH, and transmits ACK / NACK and traffic together through a PUSCH.
  • the base station can determine whether the terminal has performed downlink processing (ie, DTX or not) by looking at the signal received in the PUCCH, and also in the signal delivery range generated by the ACK / NACK transmitted through the PUSCH.
  • the energy information of the PUCCH may be a criterion for determining whether the UE decodes the PDCCH, and may be used as a criterion for determining whether the ACK / NACK information is included in the PUSCH.
  • the symbol information of the PUCCH may be mixed with the symbol information of the PUSCH to obtain a combining gain or frequency diversity.
  • control information is simultaneously transmitted through the control channel (PUCCH) and the traffic channel (PUSCH)
  • PUSCH traffic channel
  • some ACK / NACKs of several ACK / NACKs may be transmitted through a PUSCH, and other ACK / NACKs may be transmitted through a PUCCH. By doing this, it is possible to expand the symbol space.
  • Method A-3 In Method A-3 according to the present invention, when ACK / NACK is to be transmitted, traffic is not transmitted through the PUSCH. In a situation where the transmission power is limited, the transmission power can be further secured by not transmitting the PUSCH, and the arrival range of the control channel can be widened by using the secured transmission power in the control channel. In this case, it is preferable to be used when the cell signal reaching range becomes a problem.
  • Method A-4 when PUCCHs are allocated over multiple carriers, all ACK / NACKs to be transmitted through multiple PUCCHs are collected and transmitted through a single carrier. In this case, when a PUSCH is allocated, all ACK / NACKs are collected and transmitted on the PUSCH. Alternatively, when a PUCCH structure capable of sending many bits is allocated, the ACK / NACK is included in the allocated PUCCH and transmitted. For example, the PUCCH to which information such as CQI is transmitted may include both ACK / NACK and transmit.
  • the ACK / NACKs to be transmitted through a plurality of PUCCHs are not transmitted through control channels on a plurality of carriers, but the ACK / NACKs can be collected and transmitted through a single carrier.
  • ACK / NACKs are transmitted through multiple carriers, a problem regarding a peak to average power ratio / cubic metric (PAPR / CM) may occur.
  • PAPR / CM peak to average power ratio / cubic metric
  • the CQI is control information fed back by the terminal to the base station, and refers collectively to information measuring the quality of a communication channel between the terminal and the base station.
  • the CQI may be measurement information for the serving cell, measurement information for the cooperative / neighbor cell, and the number of target carriers may be one or more.
  • the base station performs various control using the feedbacked CQI.
  • the transmission When transmitting the CQI on the PUCCH, the transmission may be set to be aperiodic or periodic. In addition, when set periodically, it may be continuously transmitted in burst form at the corresponding position. That is, the CQI values of various carriers or CQI values of several adjacent cells may be transmitted, and may be continuously transmitted on time, frequency, or PUCCH resources.
  • the PUSCH and the PUCCH are likely to be transmitted at the same time.
  • the CQI information to be transmitted on the PUCCH may be transferred to the PUSCH.
  • the transmitted data will include the wideband CQI and PMI for each rank or layer.
  • the base station can know in advance whether the terminal transmits the CQI, so there is no ambiguity about the transmission format when a signal is transmitted in the PUSCH between the terminal and the base station. . Therefore, in this case, there is no need to transmit CQI separately through the PUCCH.
  • the CQI may be separately transmitted through the PUCCH.
  • the CQI information when the CQI is transmitted through the PUCCH as in the method of the first embodiment, the CQI information may be carried on the PUSCH and transmitted, or the CQI may be transmitted only through the PUCCH. Alternatively, if it is not desirable to transmit the CQI, only uplink traffic may be transmitted through the PUSCH without transmitting the CQI.
  • the CQI information may have a structure in which information on different targets is transmitted to the PUSCH and the PUCCH. That is, for example, a value for a serving cell or a first carrier may be transmitted through a PUSCH, and a value for a neighbor cell or a second carrier may be transmitted through a PUCCH. Or vice versa.
  • the transmitted value itself generates one combined coded codeword
  • the codeword may be transmitted over a symbol space consisting of PUSCH and PUCCH.
  • the CQI includes CSI, modulation and coding scheme (MCS), precoding matrix index (PMI), rank information (RI), wideband CQI (wideband CQI), and subband / sub which are actual channel information.
  • MCS modulation and coding scheme
  • PMI precoding matrix index
  • RI rank information
  • RI wideband CQI
  • subband / sub which are actual channel information.
  • a subband delta CQI, a carrier / carrier delta CQI, a codeword delta CQI, and the like may be included.
  • the CSI may be a channel matrix itself
  • the MCS is information indicating a modulation order and a code rate
  • the PMI is used to refer to a specific precoding matrix in a system using the precoding matrix.
  • a parameter, RI is information indicating a rank value in a system using a plurality of transmit and receive antennas
  • subband delta CQI is a CQI value generated for each subband by dividing a frequency band into several subbands and a specific criterion.
  • the reference value is a difference from the CQI value
  • the wideband / subband CQI refers to the CQI value itself for a given frequency band (full band or subband in which the whole band is divided).
  • Codeword CQI is a CQI generated for each codeword
  • codeword delta CQI refers to a difference in CQI values between codewords.
  • the carrier CQI and the carrier delta CQI may be used to determine a difference between a CQI value for a downlink carrier or a CQI value for each carrier (for example, a primary carrier CQI). The value calculated according to)).
  • the CQI values for neighbor cells / cooperative cells can also define absolute CQI values for each cell or delta CQIs to define differences for certain reference cells (e.g. serving cells). Can be.
  • the above-described information constituting the CQI is exemplary and is not limited thereto.
  • the CQI information may be classified and transmitted for each of the CQI information.
  • the terminal transmits the CQI it may be considered that only a part of specific information constituting the CQI listed above is selected and transmitted. For example, if the wideband CQI and PMI are transmitted together, the wideband CQI portion may be transmitted through the PUSCH and the PMI portion may be transmitted through the PUCCH, or the CQI may be transmitted through the PUCCH and the PMI may be transmitted through the PUSCH. have.
  • the CQI information may be divided and transmitted through the PUSCH and the PUCCH.
  • a wideband CQI may be transmitted through a PUCCH and a delta CQI may be transmitted through a PUSCH. Or it may be transmitted in combination in other ways.
  • the RI may transmit the PUCCH and determine a transmission format of the PUSCH based on the RI. In this case, the decoding error at the base station can be prevented because the readout can be performed with higher accuracy than the readout of the RI in the PUSCH. In contrast, it is possible to transmit the RI through the PUSCH and other information through the PUCCH. That is, since the amount of CQI / PMI varies depending on the RI, the portion which becomes the basic skeleton, that is, the RI, for example, is transmitted to the PUSCH so that its size does not change. For the rest of the RI, that is, for example, CQI / PMI It is possible to transmit on a channel other than PUSCH (for example, PUCCH).
  • PUSCH for example, PUCCH
  • RI and the PUSCH are to be transmitted at the same time, a method similar to the above-described first embodiment may be used.
  • the RI plays a very important influence on the operation of the system, the RI needs to have more protection against error occurrence than the integrated transmission of the PUSCH. It needs to be allocated.
  • RI is defined to be transmitted together through the PUSCH regardless of the type of information transmitted through the PUSCH.
  • a structure for transmitting RI through PUCCH or a structure for selecting whether to transmit RI through PUSCH may be used. If the PUCCH is used as it is, it is possible to facilitate the power allocation in the transmitting end, and as a result can deliver the correct RI.
  • the PUSCH and CQI information are preferable to transmit together when delivering the RI. Because when the RI is changed, the range of the required CQI is changed, it is possible to perform a more appropriate operation by transmitting the CQI with the PUSCH at the time the RI is transmitted in order to schedule in the base station.
  • RI and CQI / PMI are transmitted in the same subframe as described above, a method of first identifying RI through PUCCH and then decoding CQI / PMI and data transmitted through PUSCH may be considered. At this time, the RI is not transmitted through the PUSCH.
  • the symbols including the RI may be transmitted in consideration of power boosting. In other words, it is possible to transmit with higher power than other data or control channel symbols to make a lower error rate.
  • the number of bits of RI may be increased.
  • an additional bit space may be allocated on the PUCCH as well as the structure transmitted through the existing PUSCH.
  • the RI may be transmitted through the PUCCH, and the allocated bit space may be allocated on the PUSCH.
  • the PUCCH can accommodate the number of bits of the new RI by raising a modulation level or applying a technique such as differential modulation in symbol / RS / slot units.
  • the SR can be sent with other control signals or separately. If the UE can take a little delay when transmitting information on the new data to the base station, the problem does not occur even if the SR is transmitted at a subsequent transmission opportunity.
  • traffic is transmitted through the PUSCH, a buffer status is notified at a higher layer, so that resources can be continuously allocated to currently transmitted traffic.
  • HARQ Hybrid Automatic Repeat reQuest
  • SR and PUSCH are simultaneously transmitted, it is not simply a method of not sending an SR.
  • the SR is transmitted through the PUCCH, but a HARQ process that is separate from the process currently transmitted to the PUSCH is generated or is currently transmitted. If you want to deliver additional information about the traffic process that exists, these events can be specified by sending the SR over the PUCCH.
  • additional information about the SR may be transmitted through the PUCCH, and vice versa. That is, in LTE, it is not possible to describe additional information about the scheduling request while transmitting a scheduling request, for example, buffer status, emergency status, QoS, etc. It is possible to transmit information.
  • the SR information may be defined to be always transmitted through the PUCCH.
  • This embodiment relates to a method of implementing a PUCCH or a PUSCH that can be applied for LTE-A. That is, in comparison with LTE, in case of LTE-A, since the number of control information bits increases, the symbol space needs to be increased.
  • the present invention relates to a method of implementing PUCCH or PUSCH applicable in this case. According to this embodiment, it is possible to implement a control channel of LTE-A that will require more control information by extending the symbol space.
  • the PUCCH resources already allocated are not used.
  • the amount of information that can be transmitted on this PUCCH can be from 1 bit up to 20 bits.
  • the allocated PUCCH resource is to transmit ACK / NACK, this information amount is a maximum of 3 bits, and if the PUCCH resource is to transmit a CQI, this information amount can be a maximum of 20 bits.
  • the diversity information to expand the coverage information by the multi-carrier operation or the multi-cell operation increase the coverage or reliability, spatial multiplexing, modulation class, etc. Much symbol space may be required. Accordingly, in 3GPP LTE, when a PUCCH is transmitted together with a PUSCH in a situation where an LTE-A terminal and an LTE terminal coexist, a method for further transmitting control information may be considered.
  • control information for LTE-A even if the PUCCH is not transmitted together with the PUSCH as described above, a method of transmitting control information only through the PUCCH may be considered.
  • the CQI when the CQI is allocated, when performing the CQI report for the eight antennas (antenna 0 to antenna 7) provided in the LTE-A system, only four antennas need to be reported in LTE but 8 More CQI bits are needed to perform reporting on the increased antenna.
  • an additional rank indication bit may be included in the PUCCH to indicate an additional rank (when the number of antennas increases as the definition of a rank is increased).
  • the interference measurement value may have a path loss or a CQI type including PMI, MCS, CSI, RI, and the like.
  • the cell as described above may refer to any number of the cell with the most interference. Alternatively, it may refer to any number of cells with the least interference.
  • the cell ID is directly transmitted or transmitted through a list of neighbor cells, or a bitmap for each cell is displayed. And can be encrypted / modulated in the PUCCH format.
  • the above-described interference measurement value and the cell ID may be transmitted at the same time.
  • information on carrier selection may be further transmitted. That is, an indicator indicating a request to move from the current carrier position to another carrier can be delivered.
  • the indicator may be in the form of a relocation request or an ID / bitmap for a specific carrier.
  • the carrier when it is combined, it may be considered to send another carrier's CQI.
  • This CQI may include PMI, RI, CSI, MCS, and the like.
  • the present invention may use a method in which these control channels are integrated if multiple control channels are simultaneously transmitted in multiple carriers. For example, if ACK / NACK is assigned to a specific uplink carrier and a scheduling request is configured for another specific carrier, the two control information can be combined and transmitted. If CQI is transmitted to one carrier and ACK / NACK or SR is allocated to another carrier, the corresponding ACK / NACK or SR may be included in the PUCCH of the carrier through which the CQI is transmitted and transmitted.
  • the consolidation method can be performed irrespective of the number of uplink carriers. If the information to be integrated can fit into one PUCCH according to one PUCCH transmission format, the consolidation method can be further extended.
  • the CQI and the ACK / NACK may be transmitted together using QPSK modulation on the carrier for transmitting the CQI. That is, an ACK / NACK symbol may be mapped to a symbol space generated by overlapping a QPSK symbol on a CQI or by puncturing one of the CQI symbols. Alternatively, some code bits may be used for ACK / NACK indication as described below. If more ACK / NACK needs to be transmitted, it can be extended and applied within the range allowed by modulation.
  • information on SR can be transmitted using BPSK, QPSK, etc.
  • ACK / NACK can also be transmitted using BPSK, QPSK. Can be combined and transmitted on one PUCCH.
  • control signal when several control signals are transmitted together in a PUCCH and when a control signal and a traffic signal are simultaneously controlled in a PUSCH, the control signal may be transmitted as in the following example.
  • FIG. 3 illustrates a general processing structure used to transmit a message on a PUCCH for explaining the present invention.
  • S1, S2, ..., S7 represent OFDM symbols, and the total number of OFDM used in one slot may vary according to the length of CP (cyclic prefix) or other configuration. For example, in case of an extended CP, the length may be reduced to 6 or 3, and in a multicast broadcast single frequency network (MBSFN) configuration, the total length of a control channel when a specific OFDM symbol of an uplink is used for another purpose May vary. It is assumed here that the total number of OFDM symbols available is seven.
  • Masking applied to each OFDM symbol is composed of UE-specific values C1, C2, ..., C7 and messages M1, M2, ..., M7 that the UE intends to transmit.
  • C1, C2, ..., C7 may be divided into any number of subsets, and the messages M1, M2, ..., M7 are also classified according to the sequence applied to C1.
  • Corresponding message symbols for one set enclosed in a subset of C e.g. ⁇ C1, C2 ⁇ or ⁇ C1, C2, C6, C7 ⁇
  • M7 When the message value has a fixed value, that is, reference symbols having a fixed value may be defined as pilots.
  • a specific combination for example, OFDM symbol combination in the same slot or OFDM symbol combination in another slot may be used as a pilot while transmitting a message.
  • a specific bit / code sequence or symbol sequence may be applied in units of slots or subframes to symbols to be used as reference symbols.
  • the PUCCH may consist of only one PUCCH region shown in FIG. 3, or PUCCH A1 + PUCCH A2, PUCCH A1 + PUCCH B2, PUCCH B1 + PUCCH B2, or PUCCH B1 + PUCCH It may be formed over two slots, such as A2. Messages applied here may be defined in units of slots and may be defined over two slots.
  • Each message may include information of various control channels by increasing the modulation order according to the type of the corresponding PUCCH. That is, when a small amount of information is transmitted, for example, ⁇ ACK / NACK, SR, RI ⁇ , the small amount of information may be applied in a predetermined bit order. For example, important information; In order of ACK / NACK> RI> SR or ACK / NACK> SR> RI, the mapping may be performed in order according to the order of the robust bits. For example, as shown in Table 1, PUCCH information may be mixed according to a modulation class.
  • Table 1 shows various cases in which a small amount of information is integrated using modulation on the PUCCH.
  • each piece of information In the case of QPSK, two bits can be transmitted, so up to two pieces of information can be combined. It is preferable that the sum of the number of bits of each information to be combined is two. When only one piece of information is transmitted, this information may have a size of 2 bits. For example, when ⁇ ACK / NACK ⁇ is transmitted, ACK / NACK may have a size of 2 bits. When two pieces of information are combined and transmitted, each piece of information may have a size of 1 bit. For example, in case of ⁇ RI: SR ⁇ , RI has 1 bit and SR has 1 bit.
  • the sum of the number of bits of each information to be combined is three.
  • this information may have a size of 3 bits.
  • the ACK / NACK has a size of 3 bits.
  • two pieces of information are combined and transmitted, one of the pieces of information has a size of 1 bit and the other piece of information has a size of 2 bits.
  • the RI may have a size of 2 bits and the SR may have a size of 1 bit, or the RI may have a size of 1 bit and the SR may have a size of 2 bits.
  • each piece of information has a size of 1 bit.
  • 16QAM In the case of 16QAM, four bits can be transmitted, so up to four pieces of information can be combined. It is preferable that the sum of the number of bits of each information to be combined is four. In the case where only one information is transmitted, this information may have a size of 4 bits. For example, when ⁇ ACK / NACK ⁇ is transmitted, the ACK / NACK has a size of 4 bits. When two pieces of information are combined and transmitted, one piece of information has a size of 1 bit and the other piece of information has a size of 3 bits, or each piece of information has a size of 2 bits.
  • RI has 1 bit and SR has 3 bits, or RI has 2 bits and SR has 2 bits, or The RI may have a size of 3 bits and the SR may have a size of 1 bit.
  • one piece of information may have a size of 1 bit
  • the other piece of information may have a size of 1 bit
  • the other piece of information may have a size of 2 bits.
  • ⁇ ACK / NACK: SR: RI ⁇ information of any one of ACK / NACK, SR, and RI may have a size of 2 bits, and the remaining two pieces of information may have a size of 1 bit. .
  • each piece of information has a size of 1 bit.
  • information may be applied in units of subsets of OFDM symbols in the aforementioned PUCCH. That is, the OFDM symbols constituting the PUCCH are divided into several subsets, and each subset consists of one or more OFDMA symbols. If a plurality of control information is transmitted at this time, each control information may be mapped to each subset. In this case, since the size of robustness is determined according to the size of the subset, when different types of control information are simultaneously transmitted, the importance of each message and the size of the subset may be matched and transmitted. It can be assumed that the pilots are evenly distributed, and when the subset sizes are the same, the subsets near the pilots are more robust.
  • FIG. 4 illustrates an example of a subset of OFDM symbols for delivering a plurality of messages in an embodiment according to the present invention.
  • each slot may be divided into a plurality of OFDM subsets.
  • each slot may be considered both in the case of delivering the same information and in the case of delivering different information. That is, two consecutive slots may carry the same information, or two consecutive slots may carry different information.
  • the m value representing the message may be coherent information such as BPSK, QPSK, 8PSK, and 16QAM, but values may be mapped in a non-coherent manner such as 0.
  • the coherent information refers to information or symbols in consideration of the modulation class
  • the non-coherent method refers to a method in which the modulation class is not considered.
  • message 1 and message 2 are allocated at a ratio of 4: 3
  • the symbol division may have a structure such as 5: 2, 4: 2: 1, 3: 3: 1 in addition to 4: 3. .
  • each control channel value may be joint coded.
  • each coded codeword representing each control channel may be generated a codeword through joint encoding or inserting each coded codeword representing each control channel into a symbol space.
  • some of the control information i.e. Information bits can be repeated in the bit space.
  • the symbol on a specific codeword may be repeatedly inserted.
  • each control channel information may be encoded using an existing method. For example, ⁇ ACK / NACK, RI, SR when transmitting in CQI transmission format (i.e., after encoding the channel and then mapping to messages m1, m2, ...
  • ⁇ When sending any subset of ⁇ , list the messages of each control information in bits and encode them. In this case, channel encoding may be performed after repeatedly including corresponding bits according to the importance of each control information.
  • FIG. 5 is a flowchart illustrating a method for transmitting control information by a terminal of a wireless mobile communication system using a plurality of uplink carriers according to an embodiment of the present invention.
  • the wireless mobile communication terminal multiplexes first control information and second control information allocated to different uplink carriers (S501), and then combines the multiplexed first control information and second control information into one.
  • the transmission is transmitted through the predetermined uplink channel (S502).
  • the first control information and the second control information may be signals such as ACK / NACK, RI, SR, and CQI.
  • the first control information is control information allocated to a first uplink control channel assigned to a first uplink carrier, and the second control information is assigned to a second uplink control channel assigned to a second uplink carrier. Control information to be allocated.
  • the first uplink control channel and / or the second uplink control channel are not transmitted through the predetermined uplink channel as described above, the first uplink control channel may not be transmitted.
  • the one predetermined uplink channel may be the first uplink control channel or the second uplink control channel, or it may be a third uplink control channel assigned to another third uplink carrier. It may be.
  • the multiplexing operation S501 may include a bit string generated by sequentially arranging one or more bits representing the first control information and one or more bits representing the second control information. And modulating according to a modulation order corresponding to the length of the column.
  • the modulation class corresponding to the length of the generated bit string is QPSK
  • the modulation class corresponding to the length of the generated bit string is 8 PSK.
  • the modulation class corresponding to the length of the generated bit string is 16QAM.
  • the first control information is disposed in a bit resistant to the propagation error in the generated bit string.
  • the bit resistant to the propagation error is set to Most Significant Bit (MSB) of the generated bit string, but is not limited thereto.
  • MSB Most Significant Bit
  • the number of pilot signals allocated to the first subset is a pilot signal assigned to the second subset. It can be preset to set more than the number of.
  • the uplink control channel consists of a plurality of subsets, each subset consisting of one or more SC-FDMA symbols, and the first control information
  • the second control information may be mapped to a first subset of the plurality of subsets, and the second control information may be mapped to a second subset of the plurality of subsets.
  • each subset may consist of one or more OFDMA symbols.
  • FIG. 6 is a flowchart illustrating a method for transmitting control information by a terminal of a wireless mobile communication system according to another embodiment of the present invention.
  • the terminal of the wireless mobile communication system generates control information (S601), and maps the control information to both an uplink control channel and an uplink common channel transmitted simultaneously with the uplink control channel (S602).
  • the uplink control channel and the uplink common channel are simultaneously transmitted (S603).
  • the control information may be any one of ACK, NACK, CQI, and RI.
  • the CQI may include at least two different information, that is, the first information and the second information.
  • the first information may be transmitted only through the uplink control channel
  • the second information may be transmitted only through the uplink common channel.
  • the first information may be a PMI and the second information may be a wideband CQI.
  • the first information may be a wideband CQI and the second information may be a delta CQI.
  • the first information may be CQI or PMI and the second information may be RI.
  • the first information may be RI and the second information may be CQI or PMI.
  • the above-described contents of the present invention may be considered to apply to both the case where the simultaneous transmission between the plurality of data or the control information is performed in a plurality of uplink carriers as well as the case in which the uplink carrier is performed.
  • a kind of masking sequence may be applied to each consecutive section. That is, a masking sequence (that is, multiplying a constant value for one transmission resource block) for each identical PUCCH / PUSCH may be transmitted by applying an arbitrary value such that the PAPR / CM becomes small.
  • the present invention described in the present document can be used for a terminal using one or more SC-FDMA signals or clustered SC-FDMA (SC-FDMA).
  • SC-FDMA clustered SC-FDMA
  • the present invention can be used when generating and transmitting an independent channel for each carrier in multiple SC-FDMA symbols in an uplink multicarrier environment.
  • the present invention is clustered SC-FDMA (clustered) which is a method of mapping to non-contiguous subcarriers when DFT spreading is performed between several subcarrier sets within a single carrier and then assigned to actual physical subcarriers. It can also be used when using.
  • a base station has a meaning as a terminal node of a network that directly communicates with a mobile station.
  • the specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases. That is, it is apparent that various operations performed for communication with a mobile station in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
  • 'Base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like.
  • the term 'mobile station (MS)' may be replaced with terms such as a user equipment (UE), a mobile subscriber station (MSS) or a terminal.
  • Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
  • the software code may be stored in a memory unit and driven by a processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • the present invention can be used in a mobile communication terminal used in a wireless mobile communication system.

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Abstract

La présente invention concerne un procédé de transmission d'informations de commande effectué par un terminal présent dans un système de communication mobile sans fil faisant appel à plusieurs porteuses de liaison montante. Le procédé de transmission d'informations de commande comprend: le multiplexage de premières informations de commande devant être attribuées à un premier canal de liaison montante et de secondes informations de commande devant être attribuées à un second canal de liaison montante; et la transmission des premières et secondes informations de commande multiplexées par le biais d'un canal de liaison montante qui est attribué à une des multiples porteuses de liaison montante. Dans ce cas, le premier canal de commande de liaison montante et le second canal de commande de liaison montante sont respectivement attribués à des porteuses de liaison montante différentes.
PCT/KR2009/006829 2008-11-23 2009-11-19 Procédé de transmission d'informations de commande dans un système de communication mobile sans fil WO2010058979A2 (fr)

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US13/130,752 US8989169B2 (en) 2008-11-23 2009-11-19 Method for transmitting control information in wireless mobile communication system
JP2011534410A JP2012507241A (ja) 2008-11-23 2009-11-19 無線移動通信システムで制御情報を伝送する方法
CN200980146858.6A CN102224698B (zh) 2008-11-23 2009-11-19 用于在无线移动通信系统中传送控制信息的方法
EP09827744.5A EP2348658B1 (fr) 2008-11-23 2009-11-19 Procédé de transmission d'informations de commande dans un système de communication mobile sans fil

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KR101065706B1 (ko) 2011-09-19
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