WO2010122910A1 - Système de communication sans fil, appareil de station de base et appareil de station mobile - Google Patents

Système de communication sans fil, appareil de station de base et appareil de station mobile Download PDF

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Publication number
WO2010122910A1
WO2010122910A1 PCT/JP2010/056441 JP2010056441W WO2010122910A1 WO 2010122910 A1 WO2010122910 A1 WO 2010122910A1 JP 2010056441 W JP2010056441 W JP 2010056441W WO 2010122910 A1 WO2010122910 A1 WO 2010122910A1
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Prior art keywords
station apparatus
signal
information
base station
uplink
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PCT/JP2010/056441
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English (en)
Japanese (ja)
Inventor
陽介 秋元
昇平 山田
智造 野上
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シャープ株式会社
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Publication of WO2010122910A1 publication Critical patent/WO2010122910A1/fr

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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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • 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
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0092—Indication of how the channel is divided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams

Definitions

  • the present invention relates to a radio communication system, a base station apparatus, and a mobile station apparatus that transmit and receive a plurality of types of signals having different required qualities using a MIMO (Multiple Input Multiple Multiple Output) scheme between the base station apparatus and the mobile station apparatus.
  • MIMO Multiple Input Multiple Multiple Output
  • 3GPP 3rd Generation Partnership Project
  • W-CDMA Wideband-Code Division Multiple Access
  • GSM Global System Mobile for Mobile Communications
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • a communication system based on SC-FDMA Single-Carrier-Frequency-Division-Multiple Access based on resources allocated from a base station apparatus is employed.
  • the modulated transmission signal is converted into a frequency domain signal by DFT (Discrete Fourier Transformation), mapped to the frequency resource allocated by the base station apparatus, and then timed by IDFT (Inverse DFT).
  • IDFT Discrete Fourier Transformation
  • the signal is converted into an area signal and transmitted to the base station apparatus.
  • the uplink data is passed from the upper layer, corresponds to data in which the meaning of each bit is not interpreted in the physical layer, and is referred to as UL-SCH (Uplink Shared Channel) defined in the transport channel.
  • UL-SCH Uplink Shared Channel
  • control information such as spatial multiplexing number information (RI: Rank Indicator) when spatial multiplexing is applied is also transmitted.
  • PUSCH Physical-Uplink-Shared-Channel
  • PUSCH Physical-Uplink-Shared-Channel
  • FIG. 6 is a diagram showing the relationship between resource management and channels divided by time and frequency in LTE uplink.
  • the uplink resource mainly includes a physical uplink control channel (PUCCH) used for transmitting control information, and each mobile station apparatus mainly transmits data.
  • Physical uplink shared channels (PUSCH: Physical-Uplink-Shared-Channel), each of which is expressed as a set of division units called resource blocks (RB: Resource-Block).
  • RB Resource-Block
  • the number of resource blocks in the frequency direction depends on the system bandwidth.
  • a time unit occupied by one resource block is called one slot, and these two are collectively called one subframe.
  • the PUSCH is allocated to the mobile station apparatus in resource block units in which two slots are paired.
  • FIG. 7 is a diagram illustrating an example of the configuration in one resource block of PUSCH in terms of frequency and time.
  • one resource block is composed of seven SC-FDMA symbols (corresponding to one slot) and 12 subcarriers in the frequency direction, and is the minimum resource composed of one SC-FDMA symbol and one subcarrier.
  • the unit is called a resource element (RE).
  • the modulation symbols arranged in the resource element are converted into the time domain by processing such as FFT (Fast Fourier Transformation) in units of SC-FDMA symbols, and then transmitted from the mobile station apparatus to the base station apparatus.
  • FFT Fast Fourier Transformation
  • FIG. 8 is a diagram showing an example of mapping when UL-SCH, CQI, PMI, and RI described in Non-Patent Document 1 and Non-Patent Document 2 are scheduled at the same time.
  • the horizontal axis represents time, and each corresponds to one SC-FDMA symbol.
  • the vertical axis represents a sequence of modulation symbol sequences to be mapped, does not correspond to the frequency axis, is subjected to DFT processing for each SC-FDMA symbol, and is mapped to resources allocated on the frequency axis.
  • an ACK / NACK is mapped to two SC-FDMA symbols adjacent to a reference signal, and an RI is mapped to an SC-FDMA symbol separated by two from the reference signal.
  • the CQI is mapped to all SC-FDMA symbols excluding the reference signal.
  • Non-Patent Document 2 and Non-Patent Document 3 it is determined that an offset from UL-SCH corresponding to the type of information is applied to the modulation scheme and coding rate.
  • ACK / NACK and RI are always QPSK regardless of the UL-SCH modulation scheme.
  • the coding rate applied to ACK / NACK, RI, and CQI / PMI is determined by applying the offset notified from the base station apparatus to the coding rate applied to UL-SCH.
  • LTE does not employ spatial multiplexing based on MIMO (Multiple Input Multiple Output) for the uplink, and this is not taken into consideration.
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • E-UTRA Multiplexing and channel coding
  • TS 36.212 v 8.5.0 Evolved Universal Terrestrial Radio Access (E-UTRA) Physical Channels and Modulation (Release 8)” 3GPP TS 36.211 v 8.5.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) Physical layer procedures (Release 8)” 3GPP TS 36.213 v 8.5.0
  • An object of the present invention is to provide a wireless communication system, a base station apparatus, and a mobile station apparatus.
  • the wireless communication system of the present invention is a wireless communication system that transmits and receives a plurality of types of signals having different required qualities between a base station apparatus and a mobile station apparatus using a MIMO (Multiple Input Multiple Multiple Output) system.
  • MIMO Multiple Input Multiple Multiple Output
  • the required quality of the signal different numbers of spatially multiplexed sequences are selected, and based on the selected number of spatially multiplexed sequences, each signal is transmitted / received by the MIMO scheme.
  • the wireless communication system of the present invention selects at least one of different modulation schemes or coding rates according to the required quality of the signal, and based on the selected modulation scheme or coding rate, Each of the signals is processed.
  • At least one of different modulation schemes or coding rates is selected, and each signal is processed based on the selected modulation scheme or coding rate. Communication that satisfies the required quality can be carried out efficiently and simply.
  • the number of spatially multiplexed sequences is uniquely determined according to a plurality of types of signals having different required qualities.
  • the number of spatially multiplexed sequences is uniquely determined according to a plurality of types of signals having different required qualities, the number of spatially multiplexed sequences can be selected easily and quickly.
  • Transmission information sequence number information can be transmitted and received between the base station apparatus and the mobile station apparatus without being generated.
  • the radio communication system of the present invention uses the SC-FDMA (Single-Carrier-Frequency-Division-Multiple-Access) method to transmit and receive signals having the same number of selected spatial multiplexing sequences with the same symbol. It is a feature.
  • SC-FDMA Single-Carrier-Frequency-Division-Multiple-Access
  • the base station apparatus of the present invention is a base station apparatus that transmits and receives a plurality of types of signals having different required qualities using a MIMO (Multiple Input Input Multiple Output) method with a mobile station apparatus.
  • An uplink spatial multiplexing information control unit that selects different numbers of spatially multiplexed sequences according to the required quality of the signal, and at least one of a different modulation scheme or coding rate according to the required quality of the signal
  • An uplink modulation scheme / coding rate control unit to transmit, information indicating the number of selected spatial multiplexing sequences, and transmission indicating information indicating the selected modulation scheme or coding rate to the mobile station apparatus And a section.
  • the number of different spatial multiplexing sequences is selected according to the required quality of the signal, and at least one of the different modulation schemes or coding rates is selected according to the required quality of the signal, and the selected space is selected. Since the information indicating the number of multiplexed sequences and the information indicating the selected modulation scheme or coding rate are transmitted to the mobile station device, the mobile station device is based on the number of spatial multiplexed sequences, the modulation scheme or the coding rate. By transmitting the signal, communication that satisfies the required quality can be performed efficiently and easily.
  • a mobile station apparatus is a mobile station apparatus that transmits and receives a plurality of types of signals having different required qualities with a base station apparatus using a MIMO (Multiple Input Input Multiple Output) system.
  • An uplink spatial multiplexing information management unit that manages information indicating the number of spatially multiplexed sequences received from the base station apparatus; and an uplink modulation scheme that manages information indicating the modulation scheme or coding rate received from the base station apparatus -Based on the coding rate management unit and the information indicating the managed modulation scheme or coding rate, the transmission signal is modulated and / or coded according to the required quality, and is managed.
  • a mobile station-side transmitter that transmits a transmission signal to the base station apparatus in the MIMO scheme with the number of spatially multiplexed sequences corresponding to the required quality based on the information indicating the number of spatially multiplexed sequences. It is characterized in Rukoto.
  • the number of spatially multiplexed sequences managed by performing at least one of modulation and coding corresponding to the required quality on the transmission signal Since the transmission signal is transmitted to the base station apparatus by the MIMO scheme with the number of spatially multiplexed sequences corresponding to the required quality based on the information indicating that, it is possible to efficiently and easily perform communication that satisfies the required quality it can.
  • a mobile station apparatus when a mobile station apparatus transmits a plurality of types of information having different required qualities in communication resources allocated from the base station apparatus, it is efficient by applying different spatial multiplexing numbers to each. In addition, communication that satisfies the required quality can be performed easily.
  • the mobile communication system includes a mobile station device and a base station device.
  • UL-SCH Uplink Shared Channel
  • CQI Channel Quality Indicator
  • RI Rank Indicator
  • PUSCH Physical Uplink Shared Channel
  • FIG. 1 is a block diagram showing a schematic configuration of a base station apparatus according to this embodiment.
  • the base station apparatus 200 includes a transmission unit 210, a scheduling unit 220, a reception unit 230, and an antenna 240.
  • the transmission unit 210 includes an encoding unit 211, a modulation unit 212, a mapping unit 213, and a wireless transmission unit 214.
  • the scheduling unit 220 includes an uplink transmission resource control unit 221, an uplink spatial multiplexing information control unit 222, an uplink modulation scheme / coding rate control unit 223, a downlink transmission resource control unit 224, and a downlink spatial multiplexing information control.
  • the reception unit 230 includes a radio reception unit 231, an uplink propagation path calculation unit 232, and an inverse mapping / demodulation processing unit 233.
  • antennas 240 There are as many antennas 240 as necessary for transmitting downlink signals and receiving uplink signals.
  • the downlink data generated in the upper layer in base station apparatus 200 and transmitted to each mobile station apparatus and scheduling information for control information transmission output from scheduling section 220 are input to encoding section 211, respectively. Is encoded according to the control signal from the scheduling unit 220 and an encoded bit string is output.
  • the control signal from the scheduling unit 220 represents information representing a coding rate or a coding scheme such as a turbo code or a tail biting convolutional code.
  • a plurality of pieces of information may be combined and encoded, and each piece of information may be encoded separately.
  • the plurality of output bit strings of the encoding unit 211 are input to the modulation unit 212, each of which is modulated according to a control signal from the scheduling unit 220, for example, converted into BPSK, QPSK, 16QAM, and 64QAM symbols and output.
  • the output of the modulation unit 212 is input to the mapping unit 213 together with the downlink scheduling and spatial multiplexing information provided from the scheduling unit 220, and transmission data is generated.
  • the transmission data refers to, for example, an OFDM signal
  • the mapping operation corresponds to an operation corresponding to the frequency and time resources specified for each mobile station apparatus. If spatial multiplexing by MIMO is employed, this processing is performed in this block.
  • the control information refers to uplink or downlink resource allocation information, that is, transmission timing and frequency resource information, uplink or downlink signal modulation scheme and coding rate, and CQI and PMI for the mobile station apparatus. , RI transmission request, etc.
  • the signal generated by the mapping unit 213 is output to the wireless transmission unit 214.
  • the wireless transmission unit 214 it is converted into a form suitable for the transmission method, and if it is a communication method specifically compliant with OFDMA, IFFT (Inverse Fast Fourier Transformation) is performed on the signal in the frequency domain, A time domain signal is generated.
  • the output signal of the wireless transmission unit 214 is supplied to the antenna 240 and transmitted from here to each mobile station apparatus.
  • the scheduling unit 220 manages and controls the control information from the higher layer and the control information transmitted from the base station apparatus 200, determines the resource allocation to each mobile station apparatus, the modulation scheme, the coding rate, and these operations. Control and output of control information are performed.
  • the uplink transmission resource control unit 221 manages uplink resources used by each mobile station apparatus and generates a control signal thereof.
  • the uplink spatial multiplexing information control unit 222 manages information that can be calculated from the propagation path measurement signal transmitted from the mobile station apparatus, determines the number of multiplexed sequences of MIMO spatial multiplexing to be applied to uplink signal transmission, The control signal related to it is generated.
  • the uplink modulation scheme / coding rate control unit 223 manages information that can be calculated from the channel measurement signal transmitted from the mobile station apparatus, and determines the modulation scheme and coding rate to be applied to uplink signal transmission. At the same time, a control signal associated therewith is generated.
  • the uplink spatial multiplexing information control unit 222 and the uplink modulation scheme / coding rate control unit 223 perform different operations depending on the type of uplink signal, that is, the required required quality. It is a feature. Specifically, if the uplink signal is composed of UL-SCH, CQI, and RI, the uplink spatial multiplexing information control unit 222 can set different spatial multiplexing numbers for each signal, and the uplink modulation scheme The coding rate control unit 223 can set a different modulation scheme / coding rate for each signal.
  • the downlink transmission resource control unit 224 manages the downlink resource allocated to each mobile station apparatus and generates a control signal to be transmitted to each mobile station apparatus.
  • the downlink spatial multiplexing information control unit 225 manages control information (for example, RI) transmitted from the mobile station apparatus or information that can be calculated therefrom, and determines the number of multiplexed sequences of MIMO spatial multiplexing to be applied to downlink signal transmission. At the same time, a control signal associated therewith is generated.
  • the downlink modulation scheme / coding rate control unit 226 manages control information (for example, CQI or PMI) transmitted from the mobile station apparatus or information that can be calculated from the control information, and applies the modulation scheme and code applied to downlink signal transmission. At the same time as the conversion rate is determined, a control signal associated therewith is generated.
  • 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 reception unit 231 receives data and control signals, generates a digital signal corresponding to the transmission method, and outputs it. Specifically, if the OFDM method is adopted, after the received signal is converted from analog to digital, a signal subjected to FFT processing in units of processing time is output.
  • the radio reception unit 231 includes a signal for measuring the state of the uplink propagation path and a signal including information processed by an upper layer (for example, information to be managed as a data signal or control information). Are output as a first signal and a second signal, respectively.
  • the first output of the radio reception unit 231 is output to the uplink propagation path calculation unit 232.
  • information necessary for uplink signal scheduling, spatial multiplexing, modulation scheme, and coding rate determination is calculated and output to scheduling section 220.
  • the second output of the wireless reception unit 231 is output to the inverse mapping / demodulation processing unit 233.
  • the inverse mapping / demodulation processing unit 233 demodulates and extracts a plurality of types of information transmitted from the mobile station apparatus using the mapping pattern, modulation scheme, and coding rate managed by the scheduling unit 220.
  • the scheduling unit 220 if spatial multiplexing is applied to the uplink signal and two or more types of information having different communication qualities are transmitted at the same time, the time and frequency position in which each signal is included are separated in advance, and scheduling is performed.
  • inverse mapping and demodulation processing using different modulation schemes, coding rates, and spatial multiplexing numbers are performed.
  • those processed in the upper layer are output to the upper layer, and control information managed by the scheduling unit 220, such as CQI and RI, is assigned to the scheduling unit. 220.
  • FIG. 2 is a block diagram showing a schematic configuration of the mobile station apparatus according to the present embodiment.
  • the mobile station device 300 includes a reception unit 310, a scheduling information management unit 320, a transmission unit 330, and an antenna 340.
  • the reception unit 310 includes a wireless reception unit 311, a demodulation processing unit 312, and a downlink propagation path calculation unit 313.
  • the scheduling information management unit 320 includes an uplink transmission resource management unit 321, an uplink spatial multiplexing information management unit 322, an uplink modulation scheme / coding rate management unit 323, a downlink spatial multiplexing information management unit 324, a downlink modulation.
  • a system / coding rate management unit 325 and a downlink transmission resource management unit 326 are provided.
  • the output signal of the wireless reception unit 311 is input to the demodulation processing unit 312.
  • the demodulation processor 312 includes downlink signal scheduling information output from the scheduling information manager 320 (that is, information indicating where the signal addressed to the local station is allocated), the number of spatially multiplexed sequences, the modulation scheme, Control information such as a coding rate is also input, and demodulation processing is performed.
  • the demodulated signals are classified according to the signal type, information processed in the upper layer is passed to the upper layer, and information managed by the scheduling information management unit is input to the scheduling information management unit 320. Is done.
  • the downlink propagation path calculation unit 313 calculates management information such as the number of spatially multiplexed sequences applicable to the downlink, the modulation scheme, and the coding rate, using the propagation path calculation signal provided from the radio reception unit 311 as an input signal. To do. This management information is input to the scheduling information management unit 320.
  • the scheduling information management unit 320 manages the control information transmitted from the base station apparatus 200, and also performs management for transmitting the control information calculated by the mobile station apparatus 300 to the base station apparatus 200.
  • the uplink transmission resource management unit 321 manages the uplink resource information of the own station transmitted from the base station apparatus 200 and performs transmission control of the uplink signal.
  • Uplink spatial multiplexing information management section 322 manages the number of MIMO spatial multiplexing sequences transmitted from base station apparatus 200, and performs management when applying this value to an uplink signal.
  • the uplink modulation scheme / coding rate management unit 323 manages the modulation scheme and coding rate information applied to the uplink signal transmitted from the base station apparatus 200, and applies this value to the uplink signal. Manage.
  • the uplink spatial multiplexing information management unit 322 and the uplink modulation scheme / coding rate management unit 323 operate differently depending on the type of uplink signal, that is, the required quality required. It is said. Specifically, if the uplink signal is composed of UL-SCH, CQI, and RI, the uplink spatial multiplexing information management unit 322 can set different spatial multiplexing numbers for each signal, and the uplink modulation scheme
  • the coding rate management unit 323 can set a different modulation scheme / coding rate for each signal.
  • the downlink transmission resource management unit 326 manages information on downlink resource allocation transmitted from the base station apparatus 200 to the own station and controls extraction of signals transmitted to the own station.
  • the downlink spatial multiplexing information management unit 324 determines the number of spatial multiplexing sequences to be applied to the downlink signal based on the propagation path information calculated from the downlink signal, and simultaneously generates a control signal (RI) related thereto.
  • the downlink modulation scheme / coding rate management unit 325 determines a modulation scheme and a coding rate to be applied to downlink signal transmission based on the propagation path information calculated from the downlink signal, and simultaneously controls a control signal ( CQI, PMI) is generated.
  • the transmission unit 330 transmits the uplink data, CQI, and other information simultaneously on the assigned uplink resource.
  • the downlink data and the signal managed by the uplink spatial multiplexing information management unit 322 are supplied to the encoding unit 331 at the transmission timing, and the input signal is encoded at a different coding rate depending on the type. It is.
  • the plurality of series of output signals are input to the modulation unit 332, and are modulated by different modulation schemes depending on the respective types. This output is output to the spatial multiplexing / mapping unit 333.
  • Spatial multiplexing / mapping unit 333 performs signal mapping according to the spatial multiplexing number for each transmission information and mapping position information input from scheduling information management unit 320. Specifically, when SC-FDMA is applied to the transmission method, a signal is mapped to the assigned frequency domain.
  • the signal mapped by the spatial multiplexing / mapping unit 333 is input to the wireless transmission unit 334.
  • these signals are converted into a signal form to be transmitted. Specifically, an operation of converting a frequency domain signal into a time domain signal by IFFT and providing a guard interval corresponds to this.
  • the output of the wireless transmission unit 334 is supplied to the antenna 240.
  • FIG. 3 is a sequence chart in which transmission resources for transmitting UL-SCH, CQI, PMI, and RI are allocated from base station apparatus 200 to mobile station apparatus 300, and transmission is performed using these resources.
  • UL-SCH, CQI, PMI, and RI are simultaneously transmitted as information having different required qualities, but the information types are not limited to these, and other information is transmitted. It is possible to apply the same procedure as in this embodiment.
  • the base station apparatus 200 allocates resources for transmitting uplink data to the mobile station apparatus 300 and transmits a signal requesting to transmit CQI, PMI, and RI simultaneously (step S300).
  • Step S300 may include information on a modulation scheme applied to uplink signal (UL-SCH) transmission, a coding rate, and the number of spatial multiplexing, and the difference value or difference from the UL-SCH value is calculated. Only the index to represent may be notified. Further, this difference value may be shared between the mobile station apparatus 300 and the base station apparatus 200 in a form described in a specification or the like in advance.
  • UL-SCH uplink signal
  • Information regarding modulation schemes, coding rates, and spatial multiplexing numbers applied to CQI, PMI, and RI may be uniquely calculated from information applied to UL-SCH or may be explicitly notified. Furthermore, for the spatial multiplexing number, a specific value may be used for each specific information. For example, when the RI is transmitted, this always corresponds to transmission with the spatial multiplexing number set to 1. In this case, a fixed value described in a specification or the like is applied as the value to be used.
  • the base station apparatus 200 transmits a known signal used for calculating CQI, PMI, and RI to the mobile station apparatus 300 (Step S301).
  • the base station apparatus 200 calculates CQI, PMI, and RI, and at the same time, determines UL- according to the allocated resource size (eg, corresponding to the number of frequency subcarriers), modulation scheme, and coding rate.
  • An SCH is generated (step S302).
  • the coding rate corresponding to the type of information is calculated from the information given by the process of step S300 (step S303). Encoding and modulation are performed for each information (step S304).
  • a plurality of pieces of information may be encoded together, for example, a bit string obtained by serializing CQI and PMI may be generated and encoded.
  • the mapping position of each information is calculated in consideration of the number of symbols of each modulated information, and the mapping and spatial multiplexing signals are considered in consideration of the spatial multiplexing number given by the processing of step S300. Is generated (step S305).
  • FIG. 4 is a diagram showing an example in which UL-SCH, CQI, PMI, and RI are mapped.
  • the part denoted by 400 is a diagram showing resource mapping on the assumption that the SC-FDMA scheme is adopted for the uplink, the horizontal axis shows time, and one unit is 1 SC-FDMA symbol.
  • the vertical axis represents that signals (modulation symbols) in one SC-FDMA symbol are arranged in the frequency domain assigned to one mobile station apparatus 300.
  • this resource 400 there are a reference signal (RS: Reference signal) (401), UL-SCH (402), RI (403), CQI and PMI (404) used by the receiver for channel estimation. .
  • RS Reference signal
  • RI is transmitted with rank 1
  • other information is transmitted with rank N (N> 1). Since the MIMO spatial multiplexing signal separation processing at the receiver is performed in the frequency domain, it is difficult to process information of different ranks within one SC-FDMA symbol. For this reason, the second and sixth SC-FDMA symbols including the RI are transmitted with rank 1, and the other SC-FDMA symbols are transmitted with rank N.
  • the signal generated in this way is transmitted from the mobile station apparatus 300 to the base station apparatus 200 (step S308), and received (step S309), the base station apparatus 200 performs inverse mapping.
  • Each information is extracted by the processing (step S310).
  • the inverse mapping processing includes processing related to separation when the transmission signal is spatially multiplexed.
  • the signal that has been reverse-mapped and separated into the respective information (UL-SCH, CQI, PMI, RI) is decoded (step S311), and the transmitted bit string is extracted.
  • the base station apparatus and mobile station apparatus adopt the same configuration as in the first embodiment, and their operations are also performed according to the sequence chart shown in FIG.
  • the difference from the first embodiment is the mapping of each information shown in FIG. 4 and the arrangement of the number of spatially multiplexed sequences applied to it.
  • UL-SCH since the RI to be transmitted in rank 1 is mapped to two SC-FDMA symbols, UL-SCH that can be transmitted in rank N must be transmitted in rank 1, which is inefficient. .
  • the purpose of this embodiment is to improve the inefficiency.
  • FIG. 5A is a diagram illustrating an example of mapping in the second embodiment.
  • FIG. 5A shows an example in which UL-SCH, CQI, PMI, and RI are mapped.
  • this resource 400 there are a reference signal (RS: Reference signal) (401), UL-SCH (402), RI (403), CQI and PMI (404) used by the receiver for channel estimation.
  • RS Reference signal
  • UL-SCH 402
  • RI 403
  • CQI and PMI 404
  • rank N N> 1
  • the SC-FDMA symbol to which the RI is mapped is limited to the second one, only this symbol is transmitted with rank 1, and the other SC-FDMA symbols are transmitted with rank N.
  • UL-SCH, CQI, PMI may be mapped to that portion (501 and 502 in FIG. 5A). In that case, the lowest rank among the applied ranks is applied. In this case, UL-SCH mapped to 501 and 502 is transmitted in rank 1.
  • FIG. 5B is a diagram showing another example of mapping.
  • not only RI but also CQI and PMI are transmitted in rank 1.
  • the area that must be transmitted in the lower rank is reduced, and the UL-SCH area that can be transmitted in rank N is reduced.
  • the specific procedure is the same as that in the first embodiment, and is as described with reference to FIG.
  • mapping shown in FIG. 4 and the mapping shown in FIG. 5A are switched.
  • the mapping shown in FIG. 4 is used.
  • priority is given to improving the uplink data transmission efficiency over the time diversity effect
  • the mapping shown in FIG. 5A is used. It is possible to realize efficient communication.
  • the mapping shown in FIG. 4 and the mapping shown in FIG. 5A can be switched using the number of allocated resource blocks, that is, the frequency band as a threshold. As a result, it is possible to eliminate the notification of the change of the mapping method between the mobile station apparatus and the base station apparatus.
  • 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 the recording medium is recorded on this recording medium.
  • the base station apparatus and mobile station apparatus may be controlled by causing the computer system to read and execute the recorded program.
  • 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.
  • the “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. .
  • base station apparatus 210 transmitting section 211 encoding section 212 modulating section 213 mapping section 214 radio transmitting section 220 scheduling section 221 uplink transmission resource control section 222 uplink spatial multiplexing information control section 223 uplink modulation scheme / coding rate control section 224 downlink transmission resource control unit 225 downlink spatial multiplexing information control unit 226 downlink modulation scheme / coding rate control unit 230 reception unit 231 radio reception unit 232 uplink propagation path calculation unit 233 inverse mapping / demodulation processing unit 240 antenna 300 Mobile station apparatus 310 Reception section 311 Radio reception section 312 Demodulation processing section 313 Downlink propagation path calculation section 320 Scheduling information management section 321 Uplink transmission resource management section 322 Uplink spatial multiplexing information management section 323 Uplink modulation scheme / coding Management unit 324 downlink spatial multiplexing information management unit 325 downlink modulation scheme and coding rate management unit 326 downlink transmission resource management unit 330 transmitting unit 331 coding unit 332 modulation unit 333 spatial multiplex

Abstract

Selon l'invention, lorsque deux types d'information ou davantage de qualités requises, qui sont différents en termes de ressources de communication allouées, doivent être transmis, des communications peuvent être réalisées qui satisfont de manière efficace et simple les qualités requises. Un appareil de station de base (200), qui utilise un système MIMO (multiple entrée multiple sortie) pour émettre/recevoir, de/à partir d'appareils de station mobile, une pluralité de types de signaux ayant différentes qualités requises, comprend : une unité de commande d'informations de multiplexage spatial de liaison montante (222) qui sélectionne, conformément aux qualités de signaux requises, des nombres différents respectifs de séquences de multiplexage spatial ; une unité de commande de rendement de codage/de schéma de modulation de liaison montante (223) qui sélectionne, conformément aux qualités des signaux requises, au moins soit des schémas de modulation différents respectifs, soit des rendements de codage ; et une unité de transmission (210) qui transmet, aux appareils de station mobile, des informations indiquant les nombres sélectionnés de séquences de multiplexage spatial ainsi que des informations indiquant les schémas de modulation sélectionnés ou les rendements de codage.
PCT/JP2010/056441 2009-04-22 2010-04-09 Système de communication sans fil, appareil de station de base et appareil de station mobile WO2010122910A1 (fr)

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JP2015111886A (ja) * 2009-04-23 2015-06-18 クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ Ｍｉｍｏ通信システムにおける制御およびデータ多重化のための方法および装置
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US9780365B2 (en) 2010-03-03 2017-10-03 Amprius, Inc. High-capacity electrodes with active material coatings on multilayered nanostructured templates
US9172088B2 (en) 2010-05-24 2015-10-27 Amprius, Inc. Multidimensional electrochemically active structures for battery electrodes
WO2014077085A1 (fr) * 2012-11-16 2014-05-22 日本電気株式会社 Terminal de communication mobile, procédé de calcul de cqi et support d'enregistrement
CN111556568A (zh) * 2019-01-04 2020-08-18 联发科技股份有限公司 在无线局域网中的无线装置以及相关方法
CN111556568B (zh) * 2019-01-04 2023-09-01 联发科技股份有限公司 在无线局域网中的无线装置以及相关方法

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