WO2010084821A1 - Système de communication mobile, appareil de station de base, appareil de station mobile, et procédé de communication mobile - Google Patents

Système de communication mobile, appareil de station de base, appareil de station mobile, et procédé de communication mobile Download PDF

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Publication number
WO2010084821A1
WO2010084821A1 PCT/JP2010/050345 JP2010050345W WO2010084821A1 WO 2010084821 A1 WO2010084821 A1 WO 2010084821A1 JP 2010050345 W JP2010050345 W JP 2010050345W WO 2010084821 A1 WO2010084821 A1 WO 2010084821A1
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Prior art keywords
station apparatus
base station
mobile station
signal
ack
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PCT/JP2010/050345
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English (en)
Japanese (ja)
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榎本政幸
秋元陽介
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シャープ株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • 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
    • H04L5/0001—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
    • 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
    • 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
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a communication technique, and more particularly, in a base station apparatus for transmitting and receiving, a mobile communication system having a mobile station apparatus, a preprocessing technique using a plurality of resources for improving reception quality, and Receiving technology.
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • CDMA Code Division Multiple Access
  • ACK / NACK acknowledgenowledgment: Ack / negative acknowledgment: Nack
  • ACK / NACK acknowledgenowledgment: Ack / negative acknowledgment: Nack
  • SC-FDMA Single-Carrier-Frequency-Division-Multiple-Access
  • Code spreading using a CAZAC (Constant Amplitude and Zero Auto-Correlation) sequence and a block code is performed.
  • the CAZAC sequence is a sequence having a constant amplitude and excellent autocorrelation characteristics in the time domain and the frequency domain. Since the amplitude is constant in the time domain, the PAPR (Peak to Average Power Ratio) can be kept low.
  • FIG. 1 is a diagram showing the principle of resource management divided by time and frequency in LTE uplink, where the horizontal axis represents time and the vertical axis represents frequency.
  • a unit of division in the time domain is called an SC-FDMA symbol, and a unit of division in the frequency direction is called one subcarrier.
  • One SC-FDMA symbol ⁇ one subcarrier is called one resource element (RE) and is used as a minimum unit of information multiplexing.
  • a region surrounded by a thick line in the figure is called a resource block (RB) and is composed of 7 SC-FDMA symbols (1 slot) in the time direction and 12 subcarriers in the frequency direction.
  • RB resource block
  • As a minimum unit of resource allocation two slots (this is called one subframe), that is, two resource blocks are used.
  • An uplink control channel for transmitting an uplink control signal (for example, ACK / NACK) is arranged in several resource blocks at both ends of the system bandwidth (indicated by hatching in FIG. 1) to acquire frequency diversity. Are hopped for each slot. It is divided into uplink shared channels (shown in white without hatching in FIG. 1) used for uplink data signals and higher layer signals.
  • the uplink control channel includes a control signal and a reference signal used for channel estimation in demodulation. Specifically, at the time of ACK / NACK transmission, a reference signal of 12 subcarriers ⁇ 3 SC-FDMA symbols per slot is given.
  • the LTE uplink control channel uses a CAZAC sequence having a frequency direction (12 subcarriers), a time direction (for propagation path estimation), and a sequence length of 12 for one schedule unit (2 resource blocks). Code spreading in the frequency direction is performed. Also, when transmitting ACK / NACK, code spreading in the time domain is used by a block code, and specifically, a Walsh code having a sequence length of 4 is used.
  • Non-Patent Document 1 qualitatively uses a scheme such as CDD (Cyclic Delay Diversity) and STBC (Space Time Block Coding) as a two-antenna transmission diversity technique for uplink control signals. It has been evaluated. Further, the following non-patent document 2 also discusses STBC and CDD in detail.
  • CDD Cyclic Delay Diversity
  • STBC Space Time Block Coding
  • STBC is a transmission diversity technique using a plurality of antennas, and is effective in improving transmission quality in a fading environment.
  • the STBC generates and transmits a pair of transmission signals by using symbols over a plurality of antennas and continuous time.
  • the receiver by processing the obtained signal, a signal obtained by combining the respective propagation paths with the maximum ratio can be obtained, which is effective in improving the reception quality.
  • CDD transmission for example, a data signal is transmitted from a certain antenna, and the same data signal subjected to cyclic shift is simultaneously transmitted from another antenna. At the receiver, both signals are mixed and received.
  • a signal that has not been cyclically shifted on the spectrum is mixed with a signal that has been cyclically shifted, a frequency that strengthens the signal and a frequency that weakens the signal are mixed in a short frequency interval. Thereby, it is possible to eliminate a burst-like power drop in the frequency direction.
  • CDD transmission it is possible to obtain a certain degree of diversity gain without requiring special processing on the receiving side.
  • the block code to be assigned is assigned the following sequence.
  • time expressions in transmission signals at times t 1 , t 2 , t 3 , and t 4 of the 1st antenna and the 2nd antenna are respectively expressed as follows.
  • Time t 1 h 1 s 1 + h 2 s 1
  • Time t 2 ⁇ h 1 s 1 * + h 2 s 1 *
  • Time t 3 h 1 s 1 + h 2 s 1
  • Time t 4 ⁇ h 1 s 1 * + h 2 s 1 *
  • S 1 is a frequency domain transmission signal
  • f is a subcarrier interval
  • ⁇ d is a cyclic shift amount to be given.
  • the cyclic shift amount ⁇ d is increased, the frequency variation period of the propagation path can be reduced and a diversity effect can be expected.
  • CAZAC sequences use orthogonal characteristics due to cyclic delay, There may be a problem of interference. That is, it is difficult to maximize the gain by adjusting the delay amount in the CDD, and the problem is that the gain obtained by using the CDD is low.
  • An object of the present invention is to provide a transmission diversity method that can be applied without causing intersymbol interference in a CDMA environment in which code diversity is performed in the time direction and the frequency direction when applying transmission diversity.
  • a base station apparatus and a mobile station apparatus including one or more transmission antennas, the base station apparatus allocates orthogonal resources including an assigned spreading code to each mobile station apparatus, Each mobile station apparatus is a wireless communication system that transmits information multiplexed by users in the orthogonal resource to the base station apparatus, and the base station apparatus transmits two or more orthogonal resources to the mobile station apparatus.
  • the mobile station apparatus allocates the information to be transmitted to the base station apparatus using each of the two or more orthogonal resources allocated, and the allocated information is different from each other.
  • the information transmitted from the mobile station apparatus to the base station apparatus is the base station apparatus.
  • An ACK signal or NACK signal for a signal transmitted to the mobile station apparatus wherein the spreading code is a combination of a code that spreads in the time domain and a code that spreads in the frequency domain.
  • a wireless communication system is provided. Thereby, when the mobile station apparatus performs transmission diversity, it is possible to obtain diversity gain in the base station apparatus without interfering with ACK / NACK transmitted by the mobile station apparatus belonging to another LTE system.
  • the present invention may be a base station apparatus or a mobile station apparatus.
  • a base station apparatus and a mobile station apparatus including one or more transmission antennas are provided, and the base station apparatus allocates orthogonal resources including an assigned spreading code to each mobile station apparatus.
  • Each mobile station apparatus is a radio communication method in a radio communication system in which user-multiplexed information in the orthogonal resource is transmitted to the base station apparatus, and the base station apparatus has two or more to the mobile station apparatus. Allocating the orthogonal resources of the mobile station apparatus to the mobile station apparatus, and the mobile station apparatus using each of the two or more orthogonal resources to which the information to be transmitted to the base station apparatus is allocated.
  • the information includes a step of transmitting from the different transmission antennas.
  • the information transmitted from the mobile station apparatus to the base station apparatus is an ACK signal or a NACK signal for a signal transmitted from the base station apparatus to the mobile station apparatus, and the spreading code is for the time domain.
  • a mobile communication method characterized by a combination of a spreading code and a spreading code for the frequency domain.
  • the present invention may be a program for causing a computer to execute the method, or a computer-readable recording medium for recording the program.
  • the program may be provided by a transmission medium such as the Internet.
  • the present invention when transmitting an ACK / NACK signal using frequency spreading by a CAZAC sequence and block spreading in the time direction, when the same number of orthogonal resources as the number of antennas can be allocated to the mobile station apparatus, By using orthogonal resources corresponding to the number of antennas orthogonal to the orthogonal resources allocated to the users and allocating these orthogonal resources to the respective antennas, it is possible to avoid a situation that causes interference with other users.
  • the present invention relates to a case where there are fewer orthogonal resources that can be allocated than the number of antennas when transmitting ACK / NACK signals using frequency spreading by CAZAC sequences and block spreading in the time direction.
  • assignable orthogonal resources are assigned to the antennas, and the remaining antennas are assigned resources obtained by further cyclically shifting the assigned orthogonal resources.
  • Transmission diversity in which orthogonal resources different from users are assigned for each antenna enables transmission with a diversity effect without intersymbol interference between users.
  • FIG. 10 is a sequence chart diagram in which ACK / NACK resources are allocated from a base station apparatus to a mobile station apparatus, a downlink signal is generated, and ACK / NACK corresponding to the ACK / NACK is transmitted according to the second embodiment of the present invention.
  • a ... base station apparatus 210 ... transmission unit, 211 ... orthogonal resource information multiplexing unit, 212 ... modulation unit, 213 ... mapping unit, 214 ... radio transmission unit, 220 ... scheduling unit, 221 ... time, frequency resource control unit, 222 ... orthogonal resource control unit, 230 ... reception unit, 231 ... radio reception unit, 232 ... information extraction unit, 233 ... propagation path compensation / despreading unit, 234 ... combination / demodulation unit, 240 ... antenna, B ... mobile station device, DESCRIPTION OF SYMBOLS 310 ... Reception part, 320 ... Scheduling information management part, 324 ... Uplink scheduling management part, 321 ...
  • Downlink scheduling management part 322 ... Orthogonal resource management part, 323 ... Control information management part, 311 ... Radio reception part, 312 ... Propagation path compensation unit, 313 ... decoding processing unit, 314 ... error correction / detection unit, 315 ... demodulation unit, 316 ... information extraction / Away portion, 330 ... transmitting portion, 331 ... information multiplexing unit, 332 ... modulation and spreading section, 333 ... mapping unit, 334 ... wireless transmission unit.
  • the mobile communication system includes a mobile station device and a base station device.
  • a case where the same number of orthogonal resources as the number of antennas is allocated to the mobile station apparatus is shown.
  • a transmission diversity method that can be used for the LTE ACK / NACK multiplexing method will be described.
  • the present invention is not limited to ACK / NACK, and can be similarly applied to any communication system that performs CDMA in a predetermined frequency and time domain, and can transmit other information signals. Good.
  • the mobile communication system according to the first embodiment of the present invention includes a base station device and a mobile station device.
  • FIG. 2 and FIG. 3 are functional block diagrams showing one configuration example of each of the base station apparatus and the mobile station apparatus according to the present embodiment.
  • the base station apparatus A includes a transmission unit 210, a scheduling unit 220, a reception unit 230, and an antenna 240.
  • the transmission unit 210 includes an orthogonal resource information multiplexing unit 211, a modulation unit 212, a mapping unit 213, and a wireless transmission unit 214.
  • the scheduling unit 220 includes a time / frequency resource control unit 221 and an orthogonal resource control unit 222, and the reception unit 230 includes a radio reception unit 231, an information extraction unit 232, a propagation path compensation / despreading unit 233, A demodulator 234.
  • There are as many antennas 240 as necessary for transmitting downlink signals and receiving uplink signals.
  • the downlink data generated in the base station apparatus and transmitted to each mobile station apparatus and the orthogonal resource information for ACK / NACK transmission output from the scheduling unit 220 are input to the orthogonal resource mapping unit 211, and Data to be transmitted to the mobile station device is generated.
  • the information format of the orthogonal resource is not limited here, and may be transmitted explicitly using several bits to several tens of bits, or may be uniquely determined from other information.
  • downlink data may include control information in each layer.
  • the signal output from the orthogonal resource information multiplexing unit 211 is modulated by the modulation unit 212 under the designation of the scheduling unit 220 and converted into a signal format to be transmitted.
  • the bit string is modulated into a signal such as QAM or QPSK, and the modulation method may be changed according to control information from a scheduling unit described later.
  • the signal modulated by the modulation unit 212 is supplied to the mapping unit 213 and mapped to resources according to the designation of the scheduling unit 220. Specifically, in the case of OFDMA, it is mapped to the frequency and time resource specified for each mobile station device, and information broadcast to all mobile station devices is also mapped to a predetermined frequency and time resource.
  • the output of the mapping unit 213 is supplied to the wireless transmission unit 214 and converted into a form suitable for the transmission method. Specifically, in the case of an OFDMA-based communication method, IFFT (Inverse Fast Fourier Transform) is performed on a frequency domain signal to generate a time domain signal. In addition, if spatial multiplexing by MIMO (Multiple Input Multiple Output) is adopted, this processing is performed in this block.
  • IFFT Inverse Fast Fourier Transform
  • MIMO Multiple Input Multiple Output
  • the output signal of the wireless transmission unit 214 is supplied to the antenna 240, and is transmitted from here to each mobile station apparatus.
  • the scheduling unit 220 receives control information from an upper layer, and performs resource allocation to each mobile station apparatus, modulation scheme, coding rate determination, and the like.
  • the time / frequency resource control unit 221 is a function for controlling which information (control information, signal to each mobile station apparatus) including uplink and downlink is allocated to the frequency resource, and downlink. Data mapping and uplink data control signal output management are performed.
  • the orthogonal resource control unit 222 performs allocation and management of orthogonal codes used by each mobile station apparatus in an uplink signal for performing CDMA.
  • the orthogonal resource control unit 222 assigns N (N> 1) orthogonal resources for transmitting one ACK / NACK to one mobile station apparatus.
  • N is the same value as the number of antennas transmitting ACK / NACK in the mobile station apparatus.
  • the signal transmitted from the mobile station apparatus is received by the antenna 240 and then input to the radio reception unit 231.
  • the wireless receiver receives data and control signals, generates a digital signal corresponding to the transmission method, and outputs it. Specifically, in the case of an OFDM-based communication method, a signal subjected to FFT processing in units of processing time is output after analog conversion of the received signal.
  • the output of the wireless reception unit 231 is input to the information extraction unit 232 and is divided for each type of information. Specifically, the received signal is divided for each data from each mobile station apparatus, and among them, it is divided into control information and a signal to an upper layer. In the present embodiment, it is assumed that the information extraction unit particularly outputs the time resources and frequency resources included in the target ACK / NACK signal.
  • the output of the information extraction unit 232 is input to the propagation path compensation / despreading unit 233.
  • the propagation path compensation / despreading section 233 estimates the propagation path from the reference signal included in the input signal, compensates for the received signal, and at the same time, uses the orthogonal code managed by the scheduling section 220. Is despread. If the reference signal is also spread, the propagation path is calculated after despreading based on the spread code information input from the scheduling unit 220. Here, the order in which propagation path compensation and despreading are performed does not matter.
  • the propagation path compensation / despreading unit 233 performs output for each spreading code.
  • the output of the propagation path compensation / despreading unit 233 is input to the synthesizing / demodulating unit 234, and a demodulating process for reproducing the transmitted bits is performed simultaneously with synthesizing a plurality of input sequences.
  • Combining is a process for improving reception quality by performing weighted addition according to propagation path conditions.
  • the transmitted signal is ACK / NACK
  • the bit is passed to an upper layer and used for processing such as retransmission processing.
  • the processing order of the channel compensation / despreading unit 233 and the combining unit 234 is not limited. Further, by using MMSE (Minimum Mean Square Error: least mean square error method) in order to improve reception quality, these processes can be performed simultaneously.
  • MMSE Minimum Mean Square Error: least mean square error method
  • each mobile station apparatus B includes a reception unit 310, a scheduling information management unit 320, a transmission unit 330, and an antenna 240, as shown in FIG.
  • the reception unit 310 includes a wireless reception unit 311, a propagation path compensation unit 312, and a decoding processing unit 313.
  • the decoding processing unit 313 includes an error correction / detection unit 314, a demodulation unit 315, and an information extraction / separation unit 316.
  • the schedule information management unit 320 includes an uplink scheduling management unit 324, a downlink scheduling management unit 321, an orthogonal resource management unit 322, and a control information management unit 323.
  • the transmission unit 330 includes an information multiplexing unit 331, a modulation / spreading unit.
  • There are as many antennas 240 as necessary for transmitting uplink signals and receiving downlink signals.
  • the received signal is input to the radio reception unit 311.
  • the wireless reception unit 311 performs processing according to the communication method in addition to analog / digital (A / D) conversion and the like, and outputs the result. Specifically, in the case of OFDMA, the time-series signal after A / D conversion is subjected to FFT processing, converted into a time / frequency domain signal, and output.
  • An output signal of the wireless reception unit 311 is input to the propagation path compensation unit 312, and propagation path estimation is performed using a reference signal or the like given to the input signal, and propagation path compensation is performed based on the estimation and output. .
  • the output of the propagation path compensation unit 312 is input to the decoding processing unit 313, which is demodulated based on the output of the schedule information management unit 320 and, if necessary, error correction / detection is performed.
  • the first output is classified and used for scheduling, and the second output is processed in the upper layer.
  • control information in which downlink and uplink schedule information destined for the own station is received is received, after performing demodulation and error correction, the scheduling information destined for the own station is extracted and the first information is extracted. Is output to the schedule information management unit 320.
  • downlink data is received, after extracting data using information managed by the downlink scheduling management unit 321 (for example, at which frequency and time the data addressed to the own station is transmitted), Demodulate and detect errors and output as second output. Further, the presence / absence of an error detection result is output to the schedule information management unit 320 and managed by the control information management unit 323.
  • ACK / NACK is transmitted, orthogonal resources of information transmitted using CDMA, that is, when N spreading codes are transmitted, this is also output to the schedule information management unit 320, and the orthogonal resource management unit Managed at 322.
  • the processing order of the information extraction / separation unit 316, the demodulation / error correction / detection unit 314, and the demodulation unit 315 in the decoding processing unit 313 is not limited.
  • these processes may be performed before and after depending on the type of transmitted information, and these processes may be performed depending on the system.
  • the transmission unit 330 transmits uplink control information such as uplink data and ACK / NACK.
  • uplink control information such as uplink data and ACK / NACK.
  • the ACK / NACK managed by the downlink data and control information management unit 323 is supplied to the information multiplexing unit 331 at the transmission timing.
  • a process for transmitting the input information at the same time is performed.
  • the ACK / NACK signal input to the information multiplexing unit 331 is supplied to the modulation / spreading unit 332.
  • the modulation / spreading unit 332 performs modulation and spreading processing using the modulation scheme information and spreading code supplied from the schedule information management unit 320.
  • the provided spreading codes are N, that is, the same number as the number of transmission antennas, and the number of output sequences corresponding to the spreading codes is generated.
  • code spreading may be performed in two stages.
  • two types of codes are paired, and this pair is assigned to N base station apparatuses.
  • N 2 transmission antennas
  • Two CAZAC sequences and two Walsh sequences are given to one mobile station apparatus.
  • the N outputs of the modulation / spreading section 332 are output to the mapping section 333 and mapped based on the resource information assigned by the base station apparatus A managed by the uplink scheduling management section 324.
  • the resource information specifically indicates time and frequency resources in OFDMA.
  • the number of outputs of the mapping unit 333 is the same as the number of outputs of the modulation / spreading unit 332, that is, N.
  • the mapping unit 333 inputs N series of mapped signals to the wireless transmission unit 334 and converts them into a signal format to be transmitted.
  • N series of mapped signals In the case of OFDMA, an operation of converting a signal in the frequency domain by IFFT and providing a guard interval corresponds to this.
  • the output of the wireless transmission unit 334 has N sequences, and each is supplied to N antennas 240.
  • FIG. 4 is a sequence chart diagram in which ACK / NACK resources are allocated from the base station apparatus to the mobile station apparatus, a downlink signal is generated, and ACK / NACK corresponding to the ACK / NACK is transmitted.
  • the number of transmission antennas in the mobile station apparatus is 2, and it is assumed that two orthogonal resources that can be used for ACK / NACK transmission are allocated.
  • the case where the number of transmission antennas in the mobile station apparatus is two will be described as an example, even when the number of transmission antennas is greater than two, the same procedure as in the present embodiment can be applied.
  • the base station apparatus A first allocates two orthogonal resources for transmitting ACK / NACK to the mobile station apparatus B (401).
  • the allocation method at this time may use any layer of control signals, and the method is not limited.
  • the ACK / NACK transmission from the mobile station apparatus B to the base station apparatus A for this allocation since two orthogonal resources are not yet allocated at this stage, the orthogonal resources allocated by other means are used here. It is assumed that
  • Reference numeral 451 denotes orthogonal resources divided by time and frequency, and here, uplink control channels for transmitting ACK / NACK are allocated to each end of the system bandwidth by 4 RBs.
  • the numbers 0 to 3 assigned by the reference numeral 452 are RB indexes of the uplink control channel, and the numbers 0 to 3 at both ends of the reference numeral 451 are assigned as pairs.
  • the third resource (shaded portion in reference numeral 451) is allocated.
  • one resource is divided. However, slots 0 and 1 are combined, and the system frequency band is divided into resource allocation units. ing.
  • the horizontal axis is time, and two slots (slot 0, slot 1) are described.
  • One square in FIG. 4B is an allocation unit called a resource block, and one allocation unit is formed as a pair for slot 0 and slot 1. This is called one resource.
  • further orthogonal resources can be formed by code spreading in the time direction and the frequency direction.
  • Reference numeral 452 indicates orthogonal code resource allocation.
  • Reference numeral 452 indicates an orthogonal code index of the CAZAC sequence on the horizontal axis, and an index of the Walsh sequence on the vertical axis.
  • the base station apparatus A transmits resource allocation information related to the downlink signal to the mobile station apparatus B (402).
  • this resource allocation information includes modulation frequency, coding rate, and information about MIMO if using the information on the allocated frequency and time resource, HARQ, Is included, information for the mobile station apparatus B to receive and demodulate the downlink data signal, such as information related to the retransmission.
  • the base station apparatus A transmits a downlink data signal to the mobile station apparatus B (403).
  • This downlink data signal is based on the resource allocation information received at 402.
  • the mobile station apparatus B that has received the resource allocation information (402) on the downlink signal and the downlink data signal (403) performs demodulation processing including error correction and error detection processing (404).
  • An ACK / NACK signal is generated using the result of error correction, error detection processing 404, and the like (405).
  • This ACK / NACK signal is modulated and spread using the modulation scheme information and orthogonal resources (spreading code) notified in 401 (406). In this embodiment, since there are two types of spreading codes, two types of spread sequences are generated.
  • ACK / NACK mapping according to the time and frequency resources allocated in 401 is performed for each of the two types of spread sequences (406) (407).
  • a reference signal for performing channel compensation at the time of reception may be included together with the ACK / NACK signal.
  • a frequency interval signal may be IFFT processed to give a guard interval. Subsequently, the signal (407) mapped according to the time and frequency resources is mapped to the antenna corresponding to each assigned spreading code (401) (408). If a reference signal is included at 408, it is mapped to the corresponding antenna at the same time. Next, mobile station apparatus B transmits ACK / NACK based on the resource allocation of base station apparatus A to base station apparatus A (409).
  • Base station apparatus A first performs ACK / NACK processing according to the transmission method, and extracts ACK / NACK in accordance with the time and frequency resource allocation allocated in 401 (410). At this time, a reference signal for channel compensation is also extracted simultaneously with ACK / NACK. Subsequently, the base station apparatus A estimates the propagation path based on the reference signal included in the 408 ACK / NACK, compensates the received ACK / NACK signal, and then allocates two types of orthogonal resources allocated in 401. The despreading is performed according to (411). Here, the order of propagation path compensation and despreading may be reversed, or may be performed simultaneously, such as using MMSE. Further, the base station apparatus A performs demodulation processing for reproducing the transmitted bits at the same time as combining (412). For the demodulation process, the modulation scheme information notified in 401 is referred to.
  • the mobile station apparatus when the mobile station apparatus performs transmission diversity, it is possible to obtain diversity gain in the base station apparatus without interfering with ACK / NACK transmitted by the mobile station apparatus belonging to another LTE system.
  • FIG. 5 is a sequence diagram illustrating a process and a signal flow between the base station apparatus A and the mobile station apparatus B in the mobile communication system according to the second embodiment of the present invention.
  • the present embodiment describes the procedure between the base station apparatus A and one mobile station apparatus B, but the same procedure is possible when a plurality of mobile station apparatuses communicate with the base station apparatus. is there.
  • the configurations of the base station apparatus and the mobile station apparatus can be the same as the configurations shown in FIGS.
  • the uplink ACK / NACK allocation method allocated from the base station apparatus A to the mobile station apparatus B there is a difference in the uplink ACK / NACK allocation method allocated from the base station apparatus A to the mobile station apparatus B from the first embodiment.
  • the downlink signal (403 in FIG. 4) corresponding to ACK / NACK and the information on the resource allocation of the signal are already used for ACK / NACK before being transmitted (402 in FIG. 4).
  • an ACK / NACK transmission resource to be additionally allocated is allocated in advance, and one ACK / NACK transmission resource is performed together with notification of resource allocation information of a downlink signal.
  • the base station apparatus A allocates one resource for transmitting an uplink ACK / NACK to the mobile station apparatus B and transmits a signal notifying it (501).
  • Reference numeral 512 shown in FIG. 5B is allocation of orthogonal resources divided by time and frequency, and 4 RBs of uplink control channels for transmitting ACK / NACK are allocated to both ends of the system bandwidth.
  • the numbers 0 to 3 assigned by the reference numeral 512 are RB indexes of the uplink control channel, and the numbers 0 to 3 at both ends of the 512 are assigned as pairs.
  • Reference numeral 513 represents an example of orthogonal code resource allocation.
  • the horizontal axis represents the orthogonal code index of the CAZAC sequence
  • the vertical axis represents the index of the Walsh sequence.
  • the resource to be specifically allocated is an orthogonal sequence generated by the 0th CAZAC sequence and the 2nd Walsh sequence (513) in the 3rd resource block (shaded portion in reference numeral 512).
  • the base station apparatus A transmits downlink signal resource allocation information and information on one ACK / NACK resource allocation to the mobile station apparatus B (502).
  • the mobile station apparatus B that has received this signal obtains information for receiving and demodulating a downlink signal that is continuously transmitted, and obtains orthogonal resources to be used for ACK / NACK transmission.
  • the specific method for allocating the orthogonal resource is not limited. For example, even if the resource number is explicitly notified, it corresponds to other information on a one-to-one basis and moves. It may be a system in which both the station apparatus B and the base station apparatus A can share information.
  • the resource to be specifically allocated is an orthogonal sequence generated by the first CAZAC sequence and the zero Walsh sequence in the third resource block (shaded portion in 512) (513).
  • FIG. 6 is a sequence diagram showing a process and a signal flow between the base station apparatus A and the mobile station apparatus B in the mobile communication system according to the third embodiment of the present invention.
  • the present embodiment describes the procedure between the base station apparatus A and one mobile station apparatus B, but the same procedure is possible when a plurality of mobile station apparatuses communicate with the base station apparatus. is there.
  • the structure shown in FIG.2 and FIG.3 can be utilized for the structure of a base station apparatus and a mobile station apparatus.
  • the difference between the present embodiment, the first embodiment, and the second embodiment lies in uplink ACK / NACK orthogonal resources allocated from the base station apparatus A to the mobile station apparatus B.
  • the same time / frequency resources (for example, “3” in the reference numeral 451 in FIG. 4) are allocated to two antennas for ACK / NACK, and different orthogonality is assigned. A sign was assigned.
  • different time / frequency resources are allocated to the two antennas, and the same orthogonal resource allocation is performed.
  • the base station apparatus A transmits downlink signal resource allocation information and information on two ACK / NACK resource allocations to the mobile station apparatus B (602).
  • the ACK / NACK resource includes an orthogonal resource (451) divided by time and frequency and an orthogonal resource (613, 614) assigned by an orthogonal code.
  • uplink control channels for transmitting ACK / NACK are allocated 4 RBs at both ends of the system bandwidth.
  • 0 to 3 assigned in 451 are RB indexes of the uplink control channel, and numbers 0 to 3 at both ends of 451 are assigned as pairs.
  • Reference numerals 613 and 614 denote orthogonal code resource allocation.
  • Reference numerals 613 and 614 denote CAZAC sequence orthogonal code indexes on the horizontal axis, and Walsh sequence indexes on the vertical axis.
  • the mobile station apparatus B that has received the information on ACK / NACK resource allocation obtains information for receiving and demodulating a downlink signal that is transmitted continuously, and is an orthogonal resource for use in transmitting ACK / NACK for the information. Is obtained.
  • the specific method for allocating the orthogonal resources is not limited. For example, even if the resource number is explicitly notified, it corresponds one-to-one with other information, and the mobile station apparatus and the base station A system that can share information with the station apparatus may be used.
  • the first is an orthogonal sequence generated by the first CAZAC sequence and the 0th Walsh sequence in the third resource block (shaded portion in 451) (613), two The first is the orthogonal sequence generated by the 1st CAZAC sequence and the 0th Walsh sequence in the 2nd resource block (the network line portion in 451) (614).
  • the subsequent processing (403 to 412) is the same as that in the first embodiment.
  • FIG. 7 is a functional block diagram showing a configuration example of a mobile station apparatus in the mobile communication system according to the third embodiment of the present invention.
  • the configuration difference from the mobile station apparatus shown in FIG. 3 is that the number M of transmission antennas 240 in the mobile station apparatus is larger than the number N of orthogonal resources for ACK / NACK transmission provided from the base station apparatus. Yes (4 in the figure).
  • the base station apparatus A that communicates with the mobile station apparatus can use the apparatus of the configuration example shown in FIG. 2 similarly to the first embodiment, and the operation thereof is the same as that of the first embodiment. Since the operation is the same as that described in the embodiment, the description is omitted. In addition, since the operations of the reception unit 310 and the schedule information management unit 320 in the mobile station device are the same as those described in the first embodiment, the description thereof is omitted.
  • the transmission unit 330 transmits uplink control information such as uplink data and ACK / NACK.
  • uplink control information such as uplink data and ACK / NACK.
  • the ACK / NACK managed by the downlink data and control information management unit is supplied to the information multiplexing unit 331 at the transmission timing.
  • processing for transmitting the input information at the same time is performed.
  • the ACK / NACK signal input to the information multiplexing unit 331 is supplied to the modulation / spreading unit 332.
  • the modulation / spreading unit 332 modulates and spreads using the modulation scheme information and spreading code supplied from the schedule information management unit 320.
  • the provided spreading codes are N, and the number of output sequences corresponding to the spreading codes is generated.
  • code spreading may be performed in two stages.
  • two types of codes form a pair, and this pair is assigned to N base station apparatuses.
  • N 2 transmission antennas
  • two CAZAC sequences and two Walsh sequences are given to one mobile station apparatus.
  • the N outputs of the modulation / spreading section 332 are output to the mapping section 333 and mapped based on the resource information assigned by the base station apparatus managed by the uplink scheduling management section 324.
  • the resource information specifically represents time and frequency resources in OFDMA.
  • the number of outputs is the same as the number of outputs of the modulation / spreading unit 332, that is, N.
  • the N series of signals mapped by the mapping unit 333 are input to the wireless transmission unit 334 and converted into a signal form to be transmitted.
  • the output of radio transmission section 334 has N sequences, each of which is branched into several to generate M sequences. For some of them, a cyclically shifted sequence is generated through the cyclic delay unit 335 and supplied to the M antennas 240.
  • the number of cyclic delay units 335 is not limited, and it is sufficient to prepare as many as the number applied to the system.
  • the magnitude of the delay given here is not limited, but if a sequence that performs code spreading by a cyclic delay, for example, a CAZAC sequence, is used, the magnitude that does not reduce the orthogonality thereof.
  • the delay needs to be chosen.
  • a cyclic delay is added to the output of the wireless transmission unit 334.
  • a process of adding phase rotation in the frequency domain may be performed. That is, processing corresponding to the cyclic delay unit 335 may be performed inside the wireless transmission unit 334, or may be performed by the modulation / spreading unit 332 and the mapping unit 333. In this case, the number of input / output terminals of each block changes from N to M.
  • the procedure shown using the sequence chart can be applied to the configuration of the mobile station apparatus shown in the present embodiment.
  • the mapping process (408) to each transmission antenna is different from the description in the embodiments so far only in that a signal to which a cyclic delay is added is mapped.
  • transmission diversity by CDD is obtained when orthogonal resources for ACK / NACK signal transmission in the base station apparatus are depleted and sufficient resources corresponding to the number of transmission antennas cannot be allocated to the mobile station apparatus. can do.
  • the cyclic shift amount by CDD can be processed by digital signal processing, there is an advantage that the number of orthogonal resources allocated from the base station apparatus can be switched according to the situation.
  • the base station apparatus and the mobile station apparatus are one-to-one has been described as an example, but there may be a plurality of base station apparatuses and mobile station apparatuses.
  • the mobile station device is not limited to a moving terminal, and may be realized by mounting the function of the mobile station device on a base station device or a fixed terminal.
  • each function in the base station apparatus and a program for realizing each function in the mobile station apparatus are recorded on a computer-readable recording medium, and this recording medium
  • the base station apparatus and the mobile station apparatus may be controlled by causing the computer system to read and execute the program recorded in (1).
  • the “computer system” here includes an OS and hardware such as peripheral devices.
  • the “computer-readable recording medium” means a storage device such as a flexible disk, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system.
  • a “computer-readable recording medium” means that a program is dynamically held for a short time, like a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In this case, it is intended to include those that hold a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client in that case.
  • the program may be for realizing a part of the above-described functions, and may be capable of realizing the above-described functions in combination with a program already recorded in the computer system. .
  • the present invention is applicable to mobile communication devices.

Abstract

Un appareil de station de base (A) alloue deux ressources orthogonales destinées à être utilisées pour la transmission d'un signal ACK/NACK à un appareil de station mobile (B) (401). L'appareil de station de base (A) transmet ensuite à l'appareil de station mobile (B) les informations d'allocation de ressources relatives à un signal de liaison descendante (402). L'appareil de station de base (A) transmet un signal de données de liaison descendante à l'appareil de station mobile (B) (403). Une fois qu'il a reçu les informations d'allocation de ressources relatives au signal de liaison descendante (402) et le signal de données de liaison descendante (403), l'appareil de station mobile (B) exécute un processus de démodulation comprenant des corrections d'erreurs, des détections d'erreurs, et ainsi de suite pour les informations et le signal reçus (404). Les résultats de l'exécution des corrections d'erreurs, des détections d'erreurs, et ainsi de suite (404) sont utilisés pour générer un signal ACK/NACK (405). Le signal ACK/NACK est modulé et étalé en utilisant les informations du plan de modulation et les ressources orthogonales (codes d'étalement) notifiées à l'étape 401 (406). Le signal ACK/NACK est mappé sur chacun des deux types de séquences d'étalement (406) (407) en fonction des ressources temps et fréquence allouées à l'étape 401. Dans le cas de l'OFDMA, le signal de domaine de fréquence peut être soumis à un processus IFFT, et un intervalle de garde peut être ajouté au signal de domaine de fréquence. Le signal mappé en fonction des ressources temps et fréquence (407) est ensuite mappé aux antennes correspondant aux codes d'étalement alloués respectifs (401) (408). A l'étape 408, si les signaux comprennent des signaux de référence, les signaux de référence sont mappés en même temps aux antennes respectives correspondantes. L'appareil de station mobile (B) transmet les signaux ACK/NACK à l'appareil de station de base (A) sur la base des allocations de ressources de l'appareil de station de base (A) (409). L'appareil de station de base (A) exécute alors un processus en fonction des plans de transmission des signaux ACK/NACK, puis extrait les signaux ACK/NACK en fonction des ressources temps et fréquence allouées à l'étape 401 (410). L'appareil de station de base (A) estime ensuite les voies de transmission sur la base des signaux de référence compris dans les signaux ACK/NACK à l'étape 408, compense les signaux ACK/NACK reçus, puis désétale les signaux ACK/NACK en fonction des deux types de ressources orthogonales allouées à l'étape 401 (411). Par ailleurs, l'appareil de station de base (A) exécute un processus de démodulation pour reproduire les bits combinés et transmis en même temps (412). On obtient de cette manière un procédé de diversité de transmission qui applique une diversité de transmission sans interférence entre les codes dans un environnement CDMA d'étalement de codes dans les directions temps et fréquence.
PCT/JP2010/050345 2009-01-26 2010-01-14 Système de communication mobile, appareil de station de base, appareil de station mobile, et procédé de communication mobile WO2010084821A1 (fr)

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