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WO2010070852A1 - Système de communications sans fil, procédé de communications sans fil et procédé d'émission - Google Patents

Système de communications sans fil, procédé de communications sans fil et procédé d'émission Download PDF

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Publication number
WO2010070852A1
WO2010070852A1 PCT/JP2009/006795 JP2009006795W WO2010070852A1 WO 2010070852 A1 WO2010070852 A1 WO 2010070852A1 JP 2009006795 W JP2009006795 W JP 2009006795W WO 2010070852 A1 WO2010070852 A1 WO 2010070852A1
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WIPO (PCT)
Prior art keywords
transmission
signal
unit
propagation path
cluster
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English (en)
Japanese (ja)
Inventor
横枕一成
浜口泰弘
中村理
後藤淳悟
高橋宏樹
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Sharp Corp
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Sharp Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0047—Decoding adapted to other signal detection operation
    • H04L1/005—Iterative decoding, including iteration between signal detection and decoding operation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03248—Arrangements for operating in conjunction with other apparatus
    • H04L25/03286—Arrangements for operating in conjunction with other apparatus with channel-decoding circuitry
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management

Definitions

  • the present invention relates to a radio communication system, a radio communication method, and a transmission method in which a plurality of transmission apparatuses perform radio transmission to the same reception apparatus.
  • This application claims priority based on Japanese Patent Application No. 2008-319732 for which it applied to Japan on December 16, 2008, and uses the content here.
  • DSC dynamic spectrum control
  • FIGS. 8A to 8C are conceptual diagrams showing examples of signal arrangement by DSC.
  • FIGS. 8A to 8C illustrate an example in which two transmission apparatuses (transmission apparatus a and transmission apparatus b) transmit signals to one reception apparatus.
  • FIG. 8A represents an example of a frequency signal transmitted by the transmission apparatus a by a solid line
  • FIG. 8B represents an example of a frequency signal transmitted by the transmission apparatus b by a dotted line.
  • FIG. 8C shows an example of assignment of discrete spectrum units when the transmission apparatus a and the transmission apparatus b transmit signals to the same reception apparatus by DSC.
  • the horizontal axis represents frequency
  • the vertical axis represents the intensity of these signal spectra.
  • L1 represents a frequency response (propagation path characteristic) of a frequency signal propagation path from the transmission apparatus a to the reception apparatus
  • L2 represents a frequency response of a frequency signal propagation path from the transmission apparatus b to the reception apparatus.
  • L1 and L2 indicate that the higher the value in the vertical axis direction, the better the channel characteristics at that frequency.
  • each transmitting device (transmitting device a and transmitting device b) generates a modulation symbol corresponding to the number of discrete spectrums allocated to the own device, and converts this into a frequency signal by discrete Fourier transform (DFT). Convert.
  • each transmission apparatus arranges frequency signals in discrete spectrum units according to the magnitude of the frequency response of the propagation path from the respective transmission apparatus to the reception apparatus.
  • a frequency signal is preferentially arranged with respect to a discrete spectrum having a high frequency response of a propagation path in each transmission apparatus, and a plurality of transmission apparatuses (in this case, transmission apparatus a and The frequency signals are arranged in discrete spectral units so that the transmitting device b) does not allocate frequency signals.
  • a high frequency selection diversity effect is obtained.
  • the signal arrangement in other transmission devices also becomes a limitation on the allocation of discrete spectra.
  • the transmission device a cannot arrange the frequency signal in the discrete spectrum and realizes the optimum arrangement. There are things that cannot be done.
  • the frequency selection diversity effect may be reduced depending on the signal arrangement in other transmission apparatuses.
  • Non-Patent Document 1 on the premise that turbo equalization technology is applied to signal detection processing by a receiving device, by allowing the discrete spectrum of each transmitting device to overlap with the discrete spectrum of another transmitting device,
  • SORM spectrum-overlapped resource management
  • FIG. 9A to 9C are conceptual diagrams showing examples of signal arrangement by SORM.
  • FIG. 9A shows an example of a frequency signal in the transmission apparatus a.
  • FIG. 9B shows an example of a frequency signal in the transmission apparatus b.
  • FIG. 9C shows an example of assignment of discrete spectrum units when the transmission device a and the transmission device b transmit signals to the same reception device by SORM.
  • L1 represents the frequency response of the propagation path in the transmission apparatus a
  • L2 represents the frequency response of the propagation path in the transmission apparatus b.
  • the turbo equalization technique is applied to the signal detection processing by the receiving device, so that the transmission signal of the transmission device a and the transmission signal of the transmission device b are separated even in the overlapping discrete spectrum. It is possible. For this reason, it is possible to assign a discrete spectrum according to only the transmission path condition, regardless of whether or not signal assignments overlap with other transmission apparatuses in the same discrete spectrum. Therefore, the maximum frequency selection diversity is obtained in the transmittable system band, and the throughput is improved.
  • an object of the present invention is to provide a radio communication system and a radio communication method that can reduce the amount of information of allocation information related to frequency signals transmitted and received between each of a plurality of transmission apparatuses and a reception apparatus.
  • One embodiment of the present invention is a wireless communication system including a plurality of transmission devices that wirelessly transmit signals and a reception device that wirelessly receives signals from the plurality of transmission devices, wherein the transmission device includes: A coding unit that performs error correction coding on the data to be transmitted and generates code bits; a modulation unit that performs modulation processing on the code bits and generates a plurality of modulation symbols; and the plurality of modulation symbols as frequency signals.
  • a DFT unit that converts the frequency signal into a plurality of frequency signals, a cluster dividing unit that divides the plurality of frequency signals into clusters including a plurality of frequency signals, and generates a smaller number of clusters than the total number of the plurality of frequency signals, and resource block allocation information And a cluster placement unit for placing the clusters in resource blocks including a plurality of discrete spectra, and each cluster is placed in each resource block.
  • An IDFT unit that converts a frequency signal into a time signal, a reference signal multiplexing unit that multiplexes a reference signal for estimating propagation path characteristics with respect to the time signal, and a signal in which the reference signal is multiplexed is increased to a radio frequency.
  • a radio transmission unit that performs radio transmission after conversion, and the reception device includes a radio reception unit that receives a signal from each transmission device and generates a reception signal by down-conversion from a radio frequency, and is included in the reception signal
  • a propagation path estimator that estimates propagation path characteristics in each transmission apparatus based on a reference signal of each transmission apparatus, an equalization section that compensates for distortion due to the propagation path, and a decoding section that performs error correction processing on the received signal
  • the same resource block is allocated to a plurality of transmission apparatuses in the turbo equalization processing unit that detects the data before encoding by repeating the process of Regardless of whether or not, based on the estimation result of the propagation path characteristic by the propagation path estimation unit, each transmission apparatus allocates the resource block that can be used for signal transmission to each transmission apparatus, and represents the resource block
  • a scheduling unit that generates allocation information and transmits the allocation information to each transmission device.
  • the reception device includes the same number of turbo equalization processing units as the number of the plurality of transmission devices, and each turbo equalization processing unit is received from a different transmission device.
  • the reception signal may be processed.
  • the reception apparatus includes a smaller number of antennas than the number of the plurality of transmission apparatuses, and the scheduling unit transmits the same resource block more than the number of antennas. Regardless of whether or not it is assigned to a device, based on the estimation result of propagation path characteristics by the propagation path estimation unit, each transmission device allocates the resource block that can be used for signal transmission to each transmission device, and It may be configured to generate resource block allocation information representing allocation contents and transmit the generated resource block allocation information to each transmitting apparatus.
  • One aspect of the present invention is a wireless communication method performed by a wireless communication system including a plurality of transmission devices that wirelessly transmit signals and a reception device that wirelessly receives signals from the plurality of transmission devices.
  • the transmission apparatus performs error correction coding on data to be transmitted and generates code bits; performs modulation processing on the code bits to generate a plurality of modulation symbols; and A DFT step for converting to a modulation symbol frequency signal, a cluster division step for dividing the plurality of frequency signals into clusters including a plurality of frequency signals, and generating a number of clusters smaller than the total number of the plurality of frequency signals;
  • An IDFT step for converting a frequency signal in which each cluster is arranged in each resource block into a time signal; a reference signal multiplexing step for multiplexing a reference signal for estimating a propagation path characteristic with respect to the time signal; and the
  • each transmission device transmits a signal based on the estimation result of the propagation channel characteristics by the propagation channel estimation unit. And a scheduling step of allocating the resource blocks that can be used to each transmitting apparatus, generating resource block allocation information representing the allocation contents, and transmitting the resource block allocation information to each transmitting apparatus.
  • One aspect of the present invention is a transmission method for wirelessly transmitting a signal from a plurality of transmission devices to a single reception device, and each transmission device is more than the total number of a plurality of frequency signals to be transmitted.
  • a small number of clusters are generated, and the clusters are arranged in a resource block including a plurality of discrete spectra. In this case, the arrangement is performed based only on propagation path characteristics in each transmitting apparatus.
  • the allocation information related to the frequency signal transmitted / received between each of the plurality of transmission devices and the reception device is expressed in cluster units (resource block units) including a plurality of discrete spectra. Therefore, it is possible to reduce the information amount of the allocation information compared to the case where the allocation information is expressed in discrete spectrum units.
  • FIG. 3 is a schematic block diagram illustrating a functional configuration of a scheduling unit in FIG. 2. 4 is a flowchart showing the processing of the scheduling unit. It is a figure showing the concept of the system at the time of applying the multiuser MIMO of 2nd embodiment of this invention.
  • a cluster includes a predetermined number (two or more) of frequency signals and is created in each transmission device.
  • the cluster size represents the number of frequency signals included in each cluster.
  • Information regarding the cluster size is shared by being determined in advance or transmitted and received as control information in the transmission device and the reception device.
  • a resource block (hereinafter referred to as “RB”) represents a group of discrete spectra that can be allocated at the time of transmission, and an RB size represents the number of discrete spectra included in each RB.
  • the cluster size and the RB size coincide with each other and are 12 (that is, each cluster and each RB includes 12 discrete spectra), but are not limited thereto.
  • the transmission method may be a single carrier transmission method or a multicarrier transmission method.
  • FIG. 1A to 1C are conceptual diagrams showing the concept of clusters.
  • FIG. 1A shows an example of a cluster in the transmission device a.
  • FIG. 1B shows an example of a cluster in the transmission apparatus b.
  • 1A to 1C a cluster to which a frequency signal is assigned in the transmission device a is represented by a white rectangle, and a cluster to which the frequency signal is assigned in the transmission device b is represented by a hatched rectangle.
  • FIG. 1C shows an example of cluster assignment for each RB when the transmission device a and the transmission device b transmit signals to the same reception device by SORM. 1A, 1B, and 1C, the horizontal axis indicates the frequency.
  • FIG. 1A, 1B, and 1C the horizontal axis indicates the frequency.
  • L1 represents the frequency response of the propagation path in the transmission apparatus a
  • L2 represents the frequency response of the propagation path in the transmission apparatus b
  • L1 and L2 represent values such as a signal-to-interference noise power ratio (signal to interference plus noise power ratio (SINR)), and the higher the value in the vertical axis direction, the higher the value. It shows that the characteristics of the propagation path at the frequency are good.
  • SINR signal-to-interference noise power ratio
  • the transmitting apparatus a clusters a plurality of frequency signals obtained by DFT into clusters C1-1 to C4-1.
  • Each of the clusters C1-1 to C4-1 includes 12 frequency signals.
  • the transmission apparatus b clusters a plurality of frequency signals obtained by DFT into clusters C1-2 to C4-2.
  • each transmitting apparatus divides the entire system band (the entire band that can be used by the transmitting apparatus a and the transmitting apparatus b) by the RB size, and the cluster of each transmitting apparatus has a good propagation path condition for each transmitting apparatus. Place in RB.
  • clusters are overlapped by the transmission device a and the transmission device b.
  • turbo equalization processing is applied in the receiving apparatus, even if a plurality of transmitting apparatuses arrange and transmit signals overlapping the same cluster in this way, each transmitting apparatus It becomes possible to detect the signal transmitted from the receiver.
  • FIG. 2 is a schematic block diagram showing the functional configuration of the transmission apparatus.
  • the transmission apparatus includes an encoding unit 101, an interleaving unit 102, a modulating unit 103, a DFT unit 104, a cluster dividing unit 105, a cluster allocation detecting unit 106, a cluster arranging unit 107, an IDFT (Inverse DFT) unit 108, a reference signal generating unit 109, A reference signal multiplexing unit 110, a CP (Cyclic Prefix) insertion unit 111, a radio unit 112, a transmission antenna 113, a reception unit 114, and a reception antenna 115 are provided.
  • CP Common DFT
  • the encoding unit 101 performs error correction encoding on an information bit string that is data to be transmitted, and generates a code bit.
  • Interleaving section 102 rearranges the code bits in time order.
  • Modulation section 103 performs modulation by mapping the information of code bits in which the time order is rearranged to amplitude and phase, and generates a plurality of modulation symbols.
  • the DFT unit 104 performs a discrete Fourier transform on the plurality of modulation symbols to generate a frequency signal.
  • the transmission device includes a DFT unit 104 that receives input of modulation symbols by the number of symbols to be transmitted in one transmission.
  • the cluster dividing unit 105 clusters frequency signals according to the cluster size. In other words, the cluster dividing unit 105 generates a cluster shown in FIG. 1A and FIG. 1B by setting the frequency signals equal to the cluster size as one cluster.
  • the cluster allocation detection unit 106 detects cluster allocation information from the control information notified from the receiving device.
  • the cluster allocation information is information determined by the receiving device, and is information indicating resource blocks that can be used by each transmitting device during transmission. That is, each transmission device detects the frequency of a resource block that can be used by itself by referring to the cluster allocation information.
  • the cluster placement unit 107 places each cluster generated by the cluster partitioning unit 105 in the RB based on the cluster allocation information as shown in FIG. 1C.
  • the control information is a base station corresponding to the receiving apparatus in this embodiment. It is included in a signal called PDCCH (Physical Downlink Control Channel) transmitted from the apparatus to the mobile station apparatus corresponding to the transmitting apparatus.
  • PDCCH Physical Downlink Control Channel
  • the IDFT unit 108 converts the frequency signal of the cluster arranged in the RB into a time signal by IDFT.
  • the reference signal generation unit 109 generates a reference signal for estimating propagation path characteristics.
  • the reference signal multiplexing unit 110 multiplexes the reference signal with the time signal obtained by the IDFT unit 108.
  • CP insertion section 111 inserts a CP into the signal multiplexed with the reference signal.
  • CP Cyclic Prefix
  • the radio unit 112 up-converts the signal with the CP inserted into a radio frequency and transmits it from the transmission antenna 113.
  • the reception unit 114 receives a control information signal including allocation information from the reception device via the reception antenna 115, performs down-conversion, demodulation processing, decoding processing, and the like on the signal to generate control information,
  • the data is output to the cluster allocation detection unit 106.
  • the receiving antenna 115 receives a control information signal including allocation information from the receiving apparatus.
  • FIG. 3 is a schematic block diagram showing the functional configuration of the receiving apparatus.
  • the receiving device shown in FIG. 3 has a configuration for simultaneously receiving signals from two transmitting devices (transmitting device a and transmitting device b).
  • the reception apparatus includes a reception antenna 201, a radio unit 202, a CP removal unit 203, a reference signal separation unit 204, a propagation path estimation unit 205-1 and 205-2, a first DFT unit 206, a soft cancellation unit 207, and a cluster extraction unit 208.
  • the units 217-1 and 217-2, the cluster division units 218-1 and 218-2, the cluster placement units 219-1 and 219-2, and the propagation path product units 220-1 and 220-2 correspond to the receiving devices, respectively. As many transmission devices as possible are provided in the reception device.
  • each of the functional units is provided in two.
  • those with “-1” added to the reference numerals of the functional units operate corresponding to the transmission apparatus a, and those with “ ⁇ 2” attached to the transmission apparatus b. Operate.
  • the receiving antenna 201 receives a signal transmitted from each transmitting device.
  • Radio section 202 down-converts the received signal from a radio frequency to a baseband frequency and outputs it.
  • CP removing section 203 removes the CP from the received signal obtained from radio section 202.
  • the reference signal separation unit 204 separates the reference signal of each transmission device from the reception signal from which the CP has been removed.
  • the propagation path estimators 205-1 and 205-2 estimate propagation path characteristics representing the frequency response of the propagation path from each transmission apparatus based on the reference signal of each transmission apparatus from which the reference signal is separated.
  • the propagation path estimators 205-1 and 205-2 notify the scheduling section 221 of the propagation path characteristics estimated by each.
  • the first DFT unit 206 converts the received signal from which the reference signal is separated into a frequency signal. Then, turbo equalization processing is performed on the frequency signal by the functional units from the soft cancel unit 207 to the propagation path product units 220-1 and 220-2.
  • the soft cancellation unit 207 cancels the soft replica input from the propagation path product units 220-1 and 220-2 from the frequency signal, and outputs the result. However, since the soft replica is not created in the first iteration of the turbo equalization process, the frequency signal input from the first DFT unit 206-1 is output as it is.
  • the cluster extraction unit 208 inserts zeros into a signal in a frequency band other than the frequency band used by each transmission device for the output signal from the soft cancellation unit 207, and an equalization unit 209-1 corresponding to each transmission device, Output to 209-2. That is, the cluster extraction unit 208 outputs to the equalization unit 209-1 a signal in which only the frequency signal in the frequency band used by the transmission device a is left and the remaining zeros are inserted. Further, the cluster extraction unit 208 outputs to the equalization unit 209-2 a signal in which only the frequency signal in the frequency band used by the transmission apparatus b is left and the remaining zeros are inserted.
  • the equalization units 209-1 and 209-2 perform equalization processing for compensating for the distortion of the propagation path based on the propagation path characteristics estimated by the propagation path estimation units 205-1 and 205-2 for the respective signals.
  • Cluster combining sections 210-1 and 210-2 perform a process opposite to the arrangement of clusters for RBs, that is, a combination process for combining clusters arranged in each RB in order with respect to the frequency signals after equalization processing. To obtain the same number of frequency signals as the transmission signals generated by the DFT unit 104 of the transmission apparatus. In the first iteration of the turbo equalization process, there is no input from the second DFT units 217-1 and 217-2 to the cluster combining units 210-1 and 210-2.
  • IDFT units 211-1 and 211-2 perform inverse discrete Fourier transform on the frequency signal to convert it into a time signal.
  • the demodulating units 212-1 and 212-2 demodulate the time signal and decompose it into code bits.
  • the deinterleaving units 213-1 and 213-2 rearrange the order of time rearranged by the interleaving unit 102 and restore it.
  • the decoding units 214-1 and 214-2 decode the error correction code into the code bits output from the deinterleave units 213-1 and 213-2 after the turbo equalization processing is completed, The decoded bit is output to the illustrated data processing unit.
  • the decoding units 214-1 and 214-2 perform error correction processing using error correction codes on the interleaving units 215-1 and 215-2, and calculate the calculated code bits.
  • a log likelihood ratio (LLR) is output.
  • Interleave sections 215-1 and 215-2 perform rearrangement in the time order on the LLRs of the respective code bits in the same manner as the rearrangement in time order performed by interleave section 102 of the transmission apparatus.
  • Soft replica generation units 216-1 and 216-2 generate soft replicas of modulation symbols proportional to the reliability obtained from the LLRs in which the time order is rearranged.
  • the modulation scheme by the modulation unit 103 of the transmission apparatus is quadrature phase modulation (QPSK: Quadrature Phase Shift Keying), and the LLRs of the first and second bits of the code bits constituting the QPSK symbol are ⁇ 1 and ⁇ 2, respectively.
  • QPSK Quadrature Phase Shift Keying
  • the second DFT units 217-1 and 217-2 perform DFT on the soft replica to generate a frequency signal soft replica.
  • Cluster division units 218-1 and 218-2 and cluster arrangement units 219-1 and 219-2 perform processing similar to that performed by cluster division unit 105 and cluster arrangement unit 107 of each transmission device.
  • the propagation path product units 220-1 and 220-2 multiply the propagation path characteristics estimated by the propagation path estimation units 205-1 and 205-2 on the frequency signal soft replicas in which the clusters are arranged. Thus, a received signal replica is generated.
  • the soft cancellation unit 207 cancels the frequency signal replicas of all transmission apparatuses from the reception signal.
  • the function units from the cluster extraction unit 208, equalization units 209-1 and 209-2, IDFT units 211-1 and 211-2 to propagation path product units 220-1 and 220-2 are used for the first iteration process. Perform the same process as The cluster combining units 210-1 and 210-2 execute the combining process, and reconfigure the soft replica obtained by the second DFT units 217-1 and 217-2.
  • the reason why this processing is performed is that the soft cancellation unit 207 cancels all received signals including not only the interference signal but also the desired signal (transmission signal).
  • equalization processing generally involves an inverse matrix operation, canceling all soft replicas once can be handled in common when detecting signals from all transmitters, and interference signals This is because the inverse matrix calculation needs to be performed only once when the cancellation and equalization processing are performed.
  • the receiving apparatus repeats the above iterative process in the turbo equalization process an arbitrary number of times (for example, a predetermined number of times or until there is no error), and finally, from the decoding units 214-1 and 214-2, respectively, The decoded bit of the transmission signal by the apparatus b is output.
  • the reception apparatus performs the turbo equalization process, even when a cluster of a plurality of transmission apparatuses is arranged in a part of some RBs, it is possible to separate the transmission signals. Therefore, since a plurality of transmission devices can arrange clusters in the same RB, each transmission device is optimally suited to its own propagation path characteristics regardless of the cluster arrangement of other transmission devices. Cluster arrangement can be realized, and a high frequency selection diversity effect can be obtained.
  • FIG. 4 is a schematic block diagram showing a functional configuration of the scheduling unit 221 of the receiving device.
  • Scheduling section 221 includes reception SINR calculation sections 302-1 and 302-2, RB quality calculation sections 303-1 and 303-2, RB allocation information determination section 304, and control information generation sections 305-1 and 305-2.
  • the propagation path characteristics of the respective transmission devices estimated by the propagation path estimation sections 205-1 and 205-2 are input to the reception SINR calculation sections 302-1 and 302-2, respectively.
  • Reception SINR calculation sections 302-1 and 302-2 calculate the reception signal-to-interference noise power ratio (SINR) of each discrete spectrum based on the input propagation path characteristics.
  • SINR reception signal-to-interference noise power ratio
  • RB quality calculation sections 303-1 and 303-2 calculate the reception SINR of each RB in the entire transmittable band based on the reception SINR calculated by reception SINR calculation sections 302-1 and 302-2.
  • the reception SINR value of each RB calculated by the RB quality calculation units 303-1 and 303-2 may be an average value in the RB, a minimum value, or a sum. May be.
  • the value calculated by RB quality calculation sections 303-1 and 303-2 is an average value of received SINR of each discrete spectrum included in each RB.
  • the RB allocation information determination unit 304 determines the RB allocation information so as to allocate an RB having a high reception SINR to each transmission apparatus, regardless of whether or not they overlap, based on the reception SINR value of each RB.
  • the RB allocation information is information representing an RB that can be used by each transmitting apparatus during signal transmission.
  • the RB allocation information is represented using a frequency value of each RB, identification information allocated in advance to each RB, or the like.
  • Control signal generation sections 305-1 and 305-2 generate control signals including RB allocation information of each transmission apparatus, and convert them into a signal format (for example, PDCCH) notified to each transmission apparatus. Each signal after conversion is output to transmission section 222 (FIG. 3). The transmission unit 222 up-converts the control signal and transmits it to the reception device via the transmission antenna 223.
  • FIG. 5 is a flowchart showing the processing of the scheduling unit 221.
  • each received SINR calculation unit 302-1 and 302-2 calculates the received SINR of each discrete spectrum based on the propagation path characteristics (step S101).
  • the RB quality calculation units 303-1 and 303-2 calculate the reception SINR in units of RBs based on the reception SINR of each discrete spectrum (step S102).
  • the RB allocation information determination unit 304 allocates RBs that can be used by each transmission apparatus at the time of transmission to each transmission apparatus based on the reception SINR in units of RBs (step S103), and RB allocation information indicating the contents of this allocation Create Then, a radio unit (not shown) transmits a signal including RB allocation information to each transmission device (step S104).
  • the allocation information transmitted and received between each transmitting apparatus and receiving apparatus is expressed not in discrete spectral units but in cluster units.
  • control information can be reduced. For example, when the cluster size matches the RB size and the RB size is 12 as in the present embodiment, the amount of control information can be reduced to about 1/12.
  • the transmitting device described above is applied not only to a fixed communication network but also to, for example, a mobile station device (more specifically, a mobile phone) in a mobile communication network system, and the receiving device described above is applied to, for example, a base station device. It is possible to apply.
  • the cluster size and the RB size do not need to be 12, and may be less than 12 or larger than 12.
  • reception SINR calculation sections 302-1 and 302-2 need not be limited to the reception SINR of each discrete spectrum, and may be other values as long as the quality of each discrete spectrum can be evaluated. May be.
  • the above-described embodiments need not be limited to SORM.
  • OFDM Orthogonal Frequency Division Multiplexing
  • MC-CDM Multi-Carrier Code Division Multiplexing
  • uplink communication (communication from the mobile station apparatus to the base station apparatus) is targeted, but the same technique is applied to downlink communication (communication from the base station apparatus to the mobile station apparatus). ) May be applied. In that case, the transmitting apparatus becomes a base station apparatus, and the receiving apparatus becomes a mobile station apparatus.
  • FIG. 6 is a conceptual diagram showing a concept when multi-user MIMO (Multiple-Input Multiple-Output) is applied.
  • MIMO Multiple-Input Multiple-Output
  • the receiving device 2 includes a plurality of receiving antennas and signals of a plurality of transmitting devices 1 (transmitting device a to transmitting device c) are spatially multiplexed
  • the receiving device includes two receiving antennas.
  • Ordinary multi-user MIMO cannot spatially multiplex more than a number of receiving antennas. Therefore, in the case of FIG. 6, for example, only the signals of the transmission device a and the transmission device b can be multiplexed.
  • the configuration of the receiving device 2 in this case is basically the same as the configuration shown in FIG. 3, and functional units (propagation path estimating units 205-1 and 205-2 that increase or decrease depending on the number of compatible transmitting devices.
  • Equalization units 209-1, 209-2, cluster combining units 210-1, 210-2, IDFT units 211-1, 211-2, demodulation units 212-1, 212-2, deinterleaving unit 213-1, 213-2, decoding units 214-1, 214-2, interleaving units 215-1, 215-2, soft replica generation units 216-1, 216-2, second DFT units 217-1, 217-2, cluster division Sections 218-1 and 218-2, cluster placement sections 219-1 and 219-2, propagation path product sections 220-1 and 220-2) are respectively provided to correspond to the three transmission apparatuses a to c.
  • equalization units 209-1 to 209-3 have two receiving antennas, a desired signal (for example, signal of transmission apparatus a if equalization unit 109-1) is synthesized with the same phase. Equalization processing (receive diversity method such as maximum ratio combining) is performed.
  • FIG. 7 is a schematic diagram illustrating an example of RB allocation to each transmission device 1.
  • three clusters of the transmission device a, the transmission device b, and the transmission device c are multiplexed on the RB3. That is, the cluster to which the frequency signal is assigned in the transmission apparatus a is arranged in the resource blocks RB1, RB3, RB4, and RB6, and the cluster to which the frequency signal is assigned in the transmission apparatus b is arranged in the resource blocks RB1, RB2, RB3, and RB5. Then, the cluster to which the frequency signal is allocated in the transmission apparatus c is arranged in the resource blocks RB2, RB3, RB5, and RB6.
  • RB3 is overlapped by the transmission device a, the transmission device b, and the transmission device c.
  • the signal of the transmission device c is arranged in the free spectrum of the transmission device a and the transmission device b.
  • the transmission device c places a signal in an empty band that is not used by the transmission device a and the transmission device b, and thus the transmission device c has good reception quality. There is a problem that a signal cannot be selected because the correct frequency cannot be selected.
  • the transmission device c can independently perform the arrangement according to the propagation path characteristics without considering the cluster arrangement on the RB in the transmission device a and the transmission device b. As a result, the signals of all the transmission devices including the transmission device c can acquire frequency selection diversity, and good transmission characteristics can be obtained.
  • the function of the scheduling unit 221 in the above-described embodiment may be realized by a computer. In that case, it may be realized by recording a program for realizing the function of the scheduling unit 221 on a computer-readable recording medium, causing the computer system to read the program recorded on the recording medium, and executing the program. good.
  • the “computer system” includes an OS and hardware such as peripheral devices.
  • the “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM or a CD-ROM, and a hard disk incorporated in a computer system.
  • the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line.
  • a volatile memory inside a computer system serving as a server or a client in that case may be included and a program that holds a program for a certain period of time.
  • the program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.
  • the present invention is suitable for application to both fixed wireless communication and mobile communication.
  • Equalization part 210 ... Cluster combination part, 211 ... IDFT part, 212 ... Demodulation part, 213 ... Deinterleave part, 214 ... decoding part, 215 ... interleaving part, 216 ... software Preca generator, 217 ... second DFT, 218 ... cluster partition, 219 ... cluster placement, 220 ... propagation product, 221 ... schedule, 302 ... receive SINR calculator, 303 ... RB quality calculator, 304: RB allocation information determination unit, 305: Control signal generation unit

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne l'émission sans fil d'un signal d'une pluralité de dispositifs d'émission à un dispositif unique de réception, chacun des dispositifs d'émission considérés génére un groupe comportant des signaux en nombre moins important que le nombre total d'une pluralité de signaux en fréquence et positionne ledit groupe sur un bloc de ressources comprenant une pluralité de spectres discrets, le positionnement de celui-ci étant exécuté uniquement sur la base d'une caractéristique de trajet de propagation de chaque dispositif d'émission considéré.
PCT/JP2009/006795 2008-12-16 2009-12-11 Système de communications sans fil, procédé de communications sans fil et procédé d'émission Ceased WO2010070852A1 (fr)

Applications Claiming Priority (2)

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JP2008-319732 2008-12-16
JP2008319732A JP2010147564A (ja) 2008-12-16 2008-12-16 無線通信システム、無線通信方法及び送信方法

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WO2010070852A1 true WO2010070852A1 (fr) 2010-06-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011162051A1 (fr) * 2010-06-25 2011-12-29 シャープ株式会社 Système de communication, appareil de communication et procédé de communication

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"2008. PIMRC 2008. IEEE 19th International Symposium on, 2008.09.15", article KAZUNARI YOKOMAKURA ET AL.: "A Spectrum- Overlapped Resource Management in Dynamic Spectrum Control Technique, Personal, Indoor and Mobile Radio Communications", pages: 1 - 5 *
"Proceedings of the IEICE General Conference, 2003 Nen_Tsushin (1), 03 March 2003 (03.03. 2003)", article TAKASHI BABA ET AL.: "OFDM Tekio Hencho System ni Okeru Block Seigyogata Multilevel Soshin Denryoku Seigyo Hoshiki ni Kansuru Kento", pages: 547 *
"Proceedings of the IEICE General Conference, 2008 Nen_Tsushin (1), 05 March 2008 (05.03.2008)", article KAZUNARI YOKOMAKURA ET AL.: "Dynamic Spectrum Seigyo o Mochiita Spectrum Jufuku Resource Management", pages: 437 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011162051A1 (fr) * 2010-06-25 2011-12-29 シャープ株式会社 Système de communication, appareil de communication et procédé de communication
US9277556B2 (en) 2010-06-25 2016-03-01 Sharp Kabushiki Kaisha Permitting a plurality of transmit antennas to transmit the same data to improve the reception quality through transmit diversity

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