WO2014181429A1 - Système de communication, procédé de communication, terminal d'utilisateur, procédé de commande, programme de commande, station de base de connexion, station de base de coopération et système de communication sans fil - Google Patents

Système de communication, procédé de communication, terminal d'utilisateur, procédé de commande, programme de commande, station de base de connexion, station de base de coopération et système de communication sans fil Download PDF

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Publication number
WO2014181429A1
WO2014181429A1 PCT/JP2013/063058 JP2013063058W WO2014181429A1 WO 2014181429 A1 WO2014181429 A1 WO 2014181429A1 JP 2013063058 W JP2013063058 W JP 2013063058W WO 2014181429 A1 WO2014181429 A1 WO 2014181429A1
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WIPO (PCT)
Prior art keywords
communication
information
cell
user terminal
base station
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PCT/JP2013/063058
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English (en)
Japanese (ja)
Inventor
耕太郎 椎▲崎▼
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富士通株式会社
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Priority to PCT/JP2013/063058 priority Critical patent/WO2014181429A1/fr
Priority to PCT/JP2013/079419 priority patent/WO2014181484A1/fr
Publication of WO2014181429A1 publication Critical patent/WO2014181429A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • 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
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment

Definitions

  • the present invention relates to a communication system, a communication method, a user terminal, a control method, a control program, a connection base station, a coordinated base station, and a wireless communication system.
  • a communication system including a user terminal and a plurality of base stations is known.
  • One of the communication systems of this type is a cooperative communication in which a plurality of base stations cooperate to transmit a radio signal representing the same data to a user terminal in at least one of a plurality of cells included in the plurality of base stations.
  • CoMP communication is performed (see, for example, Non-Patent Document 1).
  • CoMP is an abbreviation for Coordinated Multi-Point.
  • the plurality of cells include connected cells and cooperative cells.
  • the connected cell is a cell in which radio resources for exchanging control information for controlling communication between the user terminal and the base station are provided.
  • the cooperative cell is a cell other than the connected cell. According to this, it is possible to increase the throughput for the entire communication system and the throughput for the user terminal located at the end of the cell.
  • the mobile terminal feeds back information (CSI) based on transmission path conditions of the anchor base station and the coordinated base station to the anchor base station. Further, in the first communication system, the anchor base station determines a precoding matrix based on the fed back CSI.
  • CSI back information
  • the cooperation-source base station transmits the data to be transmitted in cooperation and the cooperation control information to the cooperation-destination base station. Further, the second communication system transmits data to be cooperatively transmitted to the communication terminal based on the cooperative control information received by the cooperation-destination base station from the cooperation-source base station.
  • the third communication system transfers control information between the core network and the serving cell and between the serving cell and the auxiliary cell via the backhaul link.
  • the terminal transmits PMI (Precoding Matrix Indicator) information that the terminal desires to limit and / or recommend to the CoMP neighboring cell to the serving base station. Further, the fourth communication system transmits the PMI information received by the serving base station to the CoMP neighboring cell.
  • PMI Precoding Matrix Indicator
  • each base station preferably controls execution of cooperative communication based on communication state information corresponding to the state of communication in the cell.
  • the state of communication in each cell varies within a relatively short time as the user terminal moves.
  • This communication system includes a user terminal and a plurality of base stations.
  • the user terminal acquires communication state information corresponding to the communication state in the cell for each of the plurality of cells.
  • the user terminal transmits control information including communication state information acquired for each of the plurality of cells to the connected base station.
  • a connected base station is a base station having a connected cell.
  • the connecting base station transmits communication state information to each cooperative base station.
  • a cooperative base station is a base station having a cooperative cell.
  • each cooperative base station controls the execution of cooperative communication based on the communication state information received from the connected base station.
  • the communication state in each cell may change relatively greatly after the communication state information is acquired and before the cooperative communication based on the communication state information is actually executed. In this case, since the communication state at the time when cooperative communication is executed is not appropriately reflected in the communication state information, the quality (reception quality) of the radio signal received by the user terminal is lowered.
  • one of the objects of the present invention is to provide a communication system that can solve the above-described problem that the reception quality at the user terminal is deteriorated.
  • the present invention is not limited to the above-described object, and other effects of the present invention can be achieved by the functions and effects derived from the respective configurations shown in the embodiments for carrying out the present invention, which cannot be obtained by conventional techniques. It can be positioned as one of
  • the communication system includes a user terminal and a plurality of base stations.
  • the communication system is configured such that the plurality of base stations cooperate with each other to coordinate the radio signals representing the same data in at least one of a plurality of cells including a connection cell and at least one cooperation cell other than the connection cell.
  • the connected cell is a cell provided with radio resources for exchanging control information for controlling communication between the user terminal and the base station.
  • the communication system includes a first control in which a connection base station having the connection cell acquires the control information from a radio signal transmitted by the user terminal in the connection cell based on predetermined acquisition information.
  • Information acquisition means is provided.
  • the communication system includes an acquisition information notification unit that notifies the acquisition information to each of the cooperative base stations having the cooperative cell.
  • the communication system includes a transmission processing execution means for the user terminal to execute control information transmission processing.
  • the control information transmission process acquires communication state information corresponding to the communication state in the cell for each of the plurality of cells, and the communication state information acquired for each of the plurality of cells. It is the process which transmits the radio signal showing the said control information containing.
  • each of the cooperative base stations obtains the control information from a radio signal transmitted by the user terminal in the connected cell based on the notified acquisition information.
  • Information acquisition means is provided.
  • the reception quality at the user terminal can be improved.
  • each of a communication system, a communication method, a user terminal, a control method, a control program, a connected base station, a coordinated base station, and a wireless communication system according to the present invention will be described below.
  • the embodiment will be described with reference to FIGS.
  • the communication system includes a user terminal and a plurality of base stations. Furthermore, the communication system performs cooperative communication. Cooperative communication is communication in which a plurality of base stations cooperate to transmit radio signals representing the same data in at least one of a plurality of cells including a connected cell and at least one cooperative cell to a user terminal.
  • the cooperative communication is CoMP communication.
  • the connected cell is a cell in which radio resources for exchanging control information for controlling communication between the user terminal and the base station are provided.
  • the cooperative cell is a cell other than the connected cell.
  • connection base station having the connection cell acquires control information from a radio signal transmitted by the user terminal in the connection cell based on predetermined acquisition information.
  • the communication system notifies the acquisition information to each of the coordinated base stations having the coordinated cell.
  • the user terminal executes a control information transmission process.
  • the control information transmission process acquires communication state information corresponding to the communication state in the cell for each of the plurality of cells, and includes the communication state information acquired for each of the plurality of cells. This is a process for transmitting a radio signal representing control information.
  • each of the coordinated base stations acquires control information from a radio signal transmitted by the user terminal in the connected cell based on the notified acquisition information. Further, for each of the plurality of cells, the base station having the cell controls the execution of cooperative communication based on the communication state information included in the acquired control information.
  • the coordinated base station directly receives the radio signal transmitted from the user terminal without transmitting / receiving communication state information between the connecting base station and another base station.
  • the execution of the cooperative communication can be controlled based on the communication state information appropriately reflecting the actual communication state. As a result, even if the communication state in each cell changes within a relatively short time, it is possible to avoid a decrease in reception quality at the user terminal.
  • the communication system 1 includes a plurality of switching stations 10-1,..., A plurality of base stations 20-1, 20-2, 20-3,.
  • the exchange 10-1 may be referred to as exchange # 1. Further, the plurality of exchanges 10-1,... Can be simply expressed as the exchange 10 when it is not necessary to distinguish them.
  • the plurality of base stations 20-1, 20-2, and 20-3 can be expressed as base station # 1, base station # 2, and base station # 3, respectively. Further, the plurality of base stations 20-1, 20-2, 20-3,... Can be simply expressed as the base station 20 when it is not necessary to distinguish them.
  • user terminal 30-1 may be denoted as user terminal # 1.
  • the plurality of user terminals 30-1,... Can be simply expressed as the user terminal 30 when it is not necessary to distinguish them.
  • at least one of the number of switching centers 10, the number of base stations 20, and the number of user terminals 30 may be one.
  • the communication system 1 constitutes a mobile communication system.
  • the communication system 1 is configured to perform communication according to LTE (Long Term Evolution).
  • the communication system 1 may be configured to perform communication in accordance with LTE-Advanced.
  • the communication system 1 may be configured to perform communication according to WiMAX (Worldwide Interoperability for Microwave Access).
  • the communication system 1 performs time division duplex (TDD).
  • the communication system 1 may perform frequency division duplex (FDD; Frequency Division Duplex).
  • the exchange 10 is also referred to as MME (Mobility Management Entity).
  • the base station 20 is also expressed as an eNB (Evolved Node B).
  • the user terminal 30 is also referred to as a UE (User Equipment).
  • the exchanges 10-1,... And the base stations 20-1, 20-2, 20-3,... are connected to each other via a communication network NW.
  • each of the exchanges 10-1,... And the base stations 20-1, 20-2, 20-3,... Is connected to the communication network NW so that wired communication is possible.
  • at least one of the base stations 20-1, 20-2, 20-3,... May be connected to the communication network NW so as to enable wireless communication.
  • Each base station 20 has at least one cell.
  • the cell is a macro cell, a micro cell, a nano cell, a pico cell, a femto cell, a home cell, a sector cell, or the like.
  • Each base station 20 is configured to be capable of wireless communication with a user terminal 30 located in a cell that the own station 20 has (provides).
  • each base station 20 provides radio resources (in this example, a time slot and a frequency band) in a cell of the own station 20.
  • Each base station 20 communicates with a user terminal 30 located in a cell of the own station 20 by using radio resources provided in the cell. Thereby, each base station 20 relays communication between the user terminal 30 and the exchange 10.
  • the communication system 1 uses the cell as a connection cell for the user terminal 30 when the user terminal 30 is located in one cell. Further, when the user terminal 30 is located in a plurality of cells, the communication system 1 uses one cell among the plurality of cells as a connection cell for the user terminal 30.
  • the connected cell is a cell in which radio resources for transmitting and receiving control information for controlling communication between the user terminal 30 and the base station 20 are provided.
  • the base station (connection base station) 20 having a cell used as a connection cell for the user terminal 30 exchanges control information for controlling communication with the user terminal 30 in the connection cell.
  • the communication system 1 uses a cell having the highest communication quality as a connected cell.
  • the base station (connection base station) 20 having the connection cell determines whether or not a predetermined CoMP condition (cooperation condition) is satisfied.
  • the CoMP condition is a condition that the communication quality is lower than a predetermined threshold.
  • the CoMP condition may be a condition that the communication speed (the amount of data communicated per unit time) is lower than a predetermined threshold.
  • the CoMP condition may be a condition that the number of cells including the position of the user terminal 30 is greater than a predetermined threshold.
  • the CoMP condition is a condition that the difference between the received power of the radio signal in the connected cell and the received power of the radio signal in at least one other cell measured by the user terminal 30 is smaller than a predetermined threshold. It may be.
  • the connecting base station 20 selects a cooperative cell, and the connected base station 20 includes a plurality of selected cooperative cells and connected cells. CoMP communication is performed by the cell.
  • CoMP communication is communication for transmitting a radio signal to the user terminal 30 by performing coordinated control in a plurality of cells including a coordinated cell and a connected cell.
  • the communication system 1 executes JT (Joint Transmission) for transmitting radio signals representing the same data in a plurality of cells to the user terminal 30 using the same radio resource as CoMP communication.
  • the same radio resource is a radio resource having the same time slot and the same frequency band.
  • the base station 20 performs precoding processing based on the precoding matrix in each cell, and transmits the radio signal subjected to the precoding processing to the user terminal 30 from a plurality of antennas (physical antennas).
  • the precoding process is a process of performing weighting for each physical antenna on one modulation symbol representing data so as to execute directional transmission (beamforming) to the user terminal 30.
  • the base station 20 performs spatial multiplexing transmission or MIMO multiplexing transmission, which simultaneously transmits a plurality of data streams in the same frequency band in each cell, depending on the state of communication. It may be configured.
  • MIMO is an abbreviation for Multiple-Input and Multiple-Output.
  • the base station 20 includes a wireless communication device 21, a wired communication device 22, a wireless signal processing device 23, and a digital signal processing device 24.
  • the wireless communication device 21 includes a plurality of antennas (physical antennas). The number of antennas included in the wireless communication device 21 is also expressed as the number of physical antennas.
  • the radio communication device 21 performs radio communication with a user terminal 30 located in a cell included in the base station 20 via an antenna.
  • the wired communication device 22 includes a communication port to which a communication cable can be connected. The wired communication device 22 communicates with other stations (the switching center 10 and the base station 20) connected to the communication network NW by being connected to the communication network NW via a communication cable.
  • the radio signal processing device 23 converts the radio signal received via the antenna into a baseband signal, and outputs the converted baseband signal to the digital signal processing device 24.
  • the radio signal is an analog signal having a radio frequency band.
  • the radio signal processing device 23 converts the baseband signal output from the digital signal processing device 24 into a radio signal, and transmits the converted radio signal to the external space via the antenna.
  • the radio signal processing device 23 is configured by an LSI (Large Scale Integration).
  • the digital signal processing device 24 performs baseband processing based on the baseband signal output by the wireless signal processing device 23.
  • the digital signal processing device 24 performs baseband processing based on the baseband signal output by the wireless signal processing device 23 and the data received from another station via the wired communication device 22.
  • the digital signal processing device 24 transmits data generated by executing the baseband processing to another station via the wired communication device 22 and newly generates a baseband signal by executing the baseband processing.
  • the digital signal processing device 24 outputs the generated baseband signal to the wireless signal processing device 23.
  • the digital signal processing device 24 is configured by a DSP (Digital Signal Processor).
  • the user terminal 30 includes a wireless communication device 31, a wireless signal processing device 32, a digital signal processing device 33, an input device 34, and an output device 35.
  • the wireless communication device 31 includes at least one antenna.
  • the wireless communication device 31 performs wireless communication with the base station 20 having a cell including the position of the terminal 30 via the antenna.
  • the radio signal processing device 32 converts a radio signal received via the antenna into a baseband signal, and outputs the converted baseband signal to the digital signal processing device 33. Further, the radio signal processing device 32 converts the baseband signal output from the digital signal processing device 33 into a radio signal, and transmits the converted radio signal to the external space via the antenna.
  • the digital signal processing device 33 performs baseband processing based on the baseband signal output by the wireless signal processing device 32.
  • the digital signal processing device 33 performs baseband processing based on the baseband signal output by the wireless signal processing device 32 and the data input by the user via the input device.
  • the digital signal processing device 33 outputs data generated by executing the baseband processing via the output device, and newly generates a baseband signal by executing the baseband processing.
  • the digital signal processing device 33 outputs the generated baseband signal to the wireless signal processing device 32.
  • the user terminal 30 includes a microphone and a key-type button that constitute the input device 34. Further, the user terminal 30 includes a speaker that constitutes the output device 35. In addition, the user terminal 30 includes a touch panel display that forms both the input device 34 and the output device 35.
  • FIG. 4 represents the functions of the base station 20 for one cell. That is, the function of the base station 20 has the function shown in FIG. 4 independently for each of at least one cell of the base station 20.
  • the function for one cell will be described, but the function for another cell in the case where the base station 20 has a plurality of cells can be similarly described.
  • the function of the base station 20 includes a data signal generation unit 201, a data signal encoding / modulation unit 202, a control signal generation unit 203, a control signal encoding / modulation unit 204, and a reference.
  • a signal generation unit 205, an allocation / arrangement unit 206, and a transmission unit 207 are provided.
  • the functions of the base station 20 are a switching unit 208, an antenna unit 209, a receiving unit 210, a channel estimation unit 211, a control signal demodulation / decoding unit 212, a data signal demodulation / decoding unit 213, and a communication quality.
  • An acquisition unit 214 and a scheduler unit 215 are provided.
  • the function units 207 to 210 are realized by the wireless communication device 21 and the wireless signal processing device 23.
  • the function units 201 to 206 and 211 to 215 are realized by the digital signal processing device 24.
  • the data signal generation unit 201, the data signal encoding / modulation unit 202, and the allocation / arrangement unit 206 are examples of control means.
  • the control signal demodulation / decoding unit 212 is an example of a first control information acquisition unit.
  • the control signal demodulation / decoding unit 212 is an example of a second control information acquisition unit.
  • the scheduler unit 215 is an example of an acquisition information notification unit.
  • the scheduler unit 215 is an example of an execution request unit.
  • the data signal generator 201 generates a downlink (downlink, DL) basic data signal (basic DL data signal). Specifically, the data signal generation unit 201 generates a basic DL data signal representing data received from another station.
  • the data signal encoding / modulating unit 202 generates basic DL data generated by the data signal generating unit 201 based on DL MCS (Modulation and Coding Scheme) specific information generated by the scheduler unit 215 as described later. Encoding / modulation processing is performed on the signal.
  • the MCS identification information is information for identifying the coding rate and the modulation scheme used by the user terminal 30 for transmitting and receiving radio signals.
  • the encoding / modulation process includes a process of adding an error correction code to the basic DL data signal and a process of modulating the basic DL data signal.
  • the encoding / modulation process may include a process of adding an error detection code to the basic DL data signal.
  • the data signal encoding / modulation unit 202 outputs the DL data signal after the execution of the encoding / modulation processing to the allocation / arrangement unit 206.
  • the DL data signal is transmitted by PDSCH (Physical Downlink Shared Channel).
  • the data signal encoding / modulating unit 202 generates one series of modulation symbols based on the basic data signal.
  • the data signal encoding / modulating unit 202 converts the generated modulation symbol into a modulation symbol (provisional data signal) of a sequence of the number of data streams set according to the communication state (for example, communication environment) ( Serial / parallel conversion).
  • the number of data streams is also referred to as the transmission layer number or the transmission rank.
  • the data signal encoding / modulating section 202 performs precoding processing on the modulation symbols of the sequence of the number of data streams, so that the modulation symbols of the number of sequences corresponding to the number of antennas included in the own station 20 are performed. (DL data signal) is generated.
  • the data signal encoding / modulating unit 202 performs precoding processing based on the precoding matrix.
  • the precoding matrix is specified by communication state information included in control information acquired from the radio signal received from the user terminal 30 that is the destination of the DL data signal to be subjected to the precoding process.
  • the communication status information is information corresponding to the communication status in the cell.
  • the communication state information includes a cell identifier for identifying a cell and matrix specifying information.
  • the matrix specifying information is information for specifying a precoding matrix.
  • the matrix specifying information is PMI (Precoding Matrix Indicator).
  • y is a DL data signal representing a column vector composed of a number of modulation symbols corresponding to the number of physical antennas.
  • x is a provisional data signal representing a column vector composed of modulation symbols of the number of data streams set according to the communication state.
  • W is a precoding matrix.
  • the data signal encoding / modulating unit 202 pre-codes the data signal based on the matrix specifying information included in the communication state information. Note that the radio signal transmitted in the connected cell and the radio signal transmitted in the cooperative cell are received by the user terminal 30 after being synthesized in the external space.
  • the data signal encoding / modulation unit 202 is configured not to perform precoding processing on each DL data signal that is not determined to be transmitted by CoMP communication by the scheduler unit 215. May be.
  • the control signal generator 203 generates a DL control signal (DL control signal).
  • the control signal is a signal representing control information.
  • the control information is information for controlling communication between the user terminal 30 and the base station 20.
  • the control information represented by the DL control signal includes allocation information and MCS identification information for DL and uplink (uplink, UL), an execution request described later, and the like.
  • the allocation information is information for specifying a radio resource allocated to the user terminal 30.
  • the control signal encoding / modulating section 204 encodes / modulates the DL control signal generated by the control signal generating section 203 based on the DL MCS identification information generated by the scheduler section 215 as will be described later. Execute the process.
  • the control signal encoding / modulating section 204 outputs the DL control signal after the execution of the encoding / modulating processing to the allocating / allocating section 206.
  • the reference signal generation unit 205 generates a DL reference signal (RS; Reference Signal).
  • the DL reference signal may also be expressed as a DL reference signal.
  • the DL reference signal includes a cell identifier for identifying a cell.
  • the DL reference signal is Cell-Specific RS (CRS) which is a cell-specific reference signal.
  • CRS Cell-Specific RS
  • the DL reference signal is specific to the channel state information RS (CSI RS), which is a cell-specific reference signal used to measure the CSI, or the user terminal 30 used to demodulate the data signal.
  • CSI RS channel state information RS
  • UE-Specific RS which is a reference signal of
  • the allocation / arrangement unit 206 based on DL allocation information, the DL data signal output from the data signal encoding / modulation unit 202, the DL control signal output from the control signal encoding / modulation unit 204, and a reference
  • the DL reference signal generated by the signal generation unit 205 is multiplexed.
  • the allocation information includes allocation information generated by the scheduler unit 215 for each of the user terminals 30 that use a cell (own cell) of the local station 20 as a connected cell. Furthermore, the allocation information includes allocation information included in CoMP information (cooperation information) transmitted by the base station 20 having a cell used as a connected cell by the user terminal 30 that uses the own cell as the cooperation cell.
  • the allocation / arrangement unit 206 outputs the multiplexed signal (baseband signal) to the transmission unit 207.
  • the transmission unit 207 converts the baseband signal from the frequency domain to the time domain by executing an IFFT (Inverse Fast Fourier Transform) process on the baseband signal output from the allocation / arrangement unit 206.
  • IFFT Inverse Fast Fourier Transform
  • Transmitting section 207 converts the converted baseband signal into a radio signal, and outputs the converted radio signal to switching section 208.
  • the switching unit 208 is also called an antenna duplexer.
  • the switching unit 208 connects the antenna unit 209 and the transmission unit 207 during a period for transmitting a radio signal, and connects the antenna unit 209 and the reception unit 210 during a period for receiving a radio signal.
  • the antenna unit 209 transmits the radio signal output from the transmission unit 207 to the external space via the antenna.
  • the antenna unit 209 receives a radio signal in the external space via the antenna, and outputs the received radio signal to the reception unit 210.
  • the receiving unit 210 converts the radio signal output from the antenna unit 209 into a baseband signal.
  • the receiving unit 210 converts the baseband signal from the time domain to the frequency domain by performing FFT (Fast Fourier Transform) processing on the converted baseband signal.
  • FFT Fast Fourier Transform
  • the channel estimation unit 211 estimates the UL channel state (UL channel state) for each user terminal 30 based on the UL reference signal included in the baseband signal converted by the reception unit 210. Specifically, the channel estimation unit 211 estimates the UL channel state by estimating the transfer function in the UL channel (communication path or propagation path) between the user terminal 30 and the base station 20.
  • the communication system 1 performs time division duplex (TDD) to multiplex a downlink (DL) signal and an uplink (UL) signal. Therefore, it is estimated that the DL and UL channel states between the base station 20 and the user terminal 30 have symmetry. Therefore, the communication system 1 uses the UL channel state to control the DL signal based on the above estimation.
  • TDD time division duplex
  • DL downlink
  • UL uplink
  • the control signal demodulating / decoding unit 212 applies the baseband signal converted by the receiving unit 210 based on the UL MCS specifying information and allocation information and the UL channel state estimated by the channel estimating unit 211.
  • the demodulation / decoding process is executed.
  • the control signal demodulation / decoding unit 212 acquires the UL control signal from the baseband signal.
  • the demodulation / decoding process includes a process of demodulating the UL control signal and an error correction process based on the error correction code added to the UL control signal.
  • the demodulation / decoding process may include an error detection process based on an error detection code added to the UL control signal.
  • control signal demodulation / decoding unit 212 determines the MCS identification generated for the connected user terminal 30 by the scheduler unit 215 as described later for the radio signal transmitted by the connected user terminal 30.
  • Information and allocation information are used.
  • the connected user terminal 30 is a user terminal 30 that uses a cell (own cell) of the own station 20 as a connected cell.
  • UL allocation information and UL MCS identification information constitute acquisition information.
  • control signal demodulation / decoding unit 212 acquires control information from a radio signal transmitted by the user terminal 30 in the connected cell based on the acquisition information.
  • the radio signal transmitted by the user terminal 30 in the connected cell corresponds to the radio signal transmitted by the user terminal 30 by using the radio resource provided in the connected cell.
  • control signal demodulation / decoding section 212 uses the MCS specifying information and the allocation information included in the CoMP information for the radio signal transmitted by the user terminal 30 that uses the own cell as a cooperative cell. As will be described later, this CoMP information is received from a base station (connected base station) 20 having a cell used by the user terminal 30 as a connected cell.
  • the CoMP information includes acquisition information. That is, based on the notified acquisition information, the control signal demodulator / decoder 212 uses the radio signal transmitted by the user terminal 30 in the cell used as the connected cell by the user terminal 30 using the own cell as the cooperative cell. It can be said that control information is acquired directly.
  • the data signal demodulating / decoding unit 213 performs an operation on the baseband signal converted by the receiving unit 210 based on the UL MCS specifying information and allocation information and the UL channel state estimated by the channel estimating unit 211.
  • the demodulation / decoding process is executed. Thereby, the data signal demodulation / decoding unit 213 acquires the UL data signal from the baseband signal.
  • the demodulation / decoding process includes a process of demodulating the UL data signal and an error correction process based on the error correction code added to the UL data signal.
  • the demodulation / decoding process may include an error detection process based on an error detection code added to the UL data signal.
  • the data signal demodulating / decoding unit 213 generates the MCS specifying information generated for the user terminal 30 by the scheduler unit 215 as described later with respect to the radio signal transmitted by the connected user terminal 30. And allocation information.
  • the communication quality acquisition unit 214 executes a communication quality acquisition process every time a UL reference signal is received. Note that the communication quality acquisition unit 214 may execute a communication quality acquisition process every time a predetermined communication quality acquisition cycle elapses.
  • the communication quality acquisition process includes a process of acquiring UL communication quality information (UL communication quality information) based on the UL channel state for each of the user terminals 30 that use the own cell as a connected cell.
  • the UL channel state is estimated by the channel estimation unit 211 based on the radio signal transmitted by the user terminal 30 to be acquired.
  • UL communication quality information includes per-cell quality information indicating the quality of communication between the own station 20 and the user terminal 30 in the connected cell.
  • the quality information for each cell is CQI (Channel Quality Indicator).
  • the quality information for each cell may be RSRP, SINR, path loss, RSRQ, or the like.
  • RSRP is an abbreviation for Reference Signal Received Power.
  • SINR is an abbreviation for Signal to Interference plus Noise Power Ratio.
  • RSRQ is an abbreviation for Reference Signal Received Quality.
  • the per-cell quality information may be any combination of RSRP, SINR, path loss, CQI, and RSRQ.
  • the scheduler unit 215 determines MCS based on the communication quality information for each of the connected user terminals 30, and allocates a part of the radio resources provided in the connected cell.
  • the MCS is used for the user terminal 30 to be determined to transmit and receive a radio signal.
  • the radio resource is configured by a time slot and a frequency band.
  • the user terminal 30 transmits control information including DL communication quality information (DL communication quality information) to the base station 20 having a cell used as a connected cell. Therefore, in this example, the DL communication quality information is acquired by the control signal demodulation / decoding unit 212.
  • the UL communication quality information is acquired by the communication quality acquisition unit 214.
  • the scheduler unit 215 includes UL MCS identification information (ULMCS identification information), DL MCS identification information (DLMCS identification information), UL allocation information (UL allocation information), and DL allocation information. (DL allocation information) is generated.
  • Allocation information is information for specifying a radio resource allocated to the user terminal 30. That is, it can be said that the allocation information is information for specifying a portion allocated to the user terminal 30 among the radio resources provided in the connected cell.
  • the MCS specifying information is information for specifying the MCS determined for the user terminal 30. That is, the MCS specifying information is used for specifying the MCS used for transmitting and receiving a radio signal by using the portion allocated to the user terminal 30 among the radio resources provided in the connected cell by the user terminal 30. It can be said that it is information.
  • the acquisition information includes UL allocation information and ULMCS identification information. That is, it can be said that the scheduler unit 215 generates acquisition information for each connected user terminal 30.
  • the acquisition information may also include information (for example, a scramble code) for decrypting the encrypted or encoded information.
  • the scheduler unit 215 controls the MCS identification information and the allocation information for each of the connected user terminals 30 so that the generated MCS identification information and the allocation information are transmitted to the user terminal 30.
  • the data is output to the generation unit 203.
  • the MCS identification information and the allocation information are included in the control information.
  • the scheduler unit 215 determines whether or not the CoMP condition is satisfied for each connected user terminal 30.
  • the scheduler unit 215 determines that the DL data signal destined for the user terminal 30 determined to satisfy the CoMP condition is transmitted by CoMP communication.
  • the scheduler unit 215 determines that the DL data signal destined for the user terminal 30 determined that the CoMP condition is not satisfied is not transmitted by CoMP communication.
  • the scheduler unit 215 transmits the DL data signal to which the user terminal 30 is the destination as CoMP. It is decided to transmit by communication. That is, in this case, the CoMP information is transmitted by the base station 20 when the base station 20 determines that the CoMP condition is satisfied for the user terminal 30.
  • the scheduler unit 215 determines at least one cooperative cell (cooperative TP (Transmission Point)) for each of the user terminals 30 determined to satisfy the CoMP condition, based on the DL communication quality information.
  • the communication quality information is transmitted by the user terminal 30 to be determined, and is included in the UL control signal after the control signal demodulation / decoding unit 212 performs the demodulation / decoding process.
  • the scheduler unit 215 determines a cell whose quality information for each cell is larger than a preset threshold value as a cooperative cell.
  • the scheduler unit 215 may be configured to determine a predetermined number of cooperative cells as cooperative cells. In this case, it is preferable that the scheduler unit 215 preferentially determines a cell having a larger quality information for each cell as a cooperative cell.
  • the scheduler unit 215 generates cooperative TP information representing the determined cooperative cell for each of the user terminals 30 determined to satisfy the CoMP condition.
  • the cooperative TP information includes a cell identifier for identifying a cooperative cell.
  • the scheduler unit 215 has a base station (cooperative base station) having a cell (that is, a determined cooperative cell) used by the user terminal 30 as a cooperative cell for each user terminal 30 for which the CoMP condition is established. ) CoMP information is transmitted to each of 20.
  • CoMP information includes the generated information for acquisition. Furthermore, in this example, the CoMP information specifies communication timing information indicating the timing (CoMP communication timing or cooperative communication timing) at which CoMP communication is executed, and DL radio resources used for executing CoMP communication. Radio resource information for That is, it can be said that the scheduler unit 215 notifies the acquisition information to each of the cooperative base stations 20 having the cooperative cell.
  • data transmitted to the user terminal 30 by CoMP communication is transmitted from the connected base station 20 to the coordinated base station 20 together with CoMP information.
  • data transmitted to the user terminal 30 by CoMP communication may be directly transmitted from the switching center 10 to the cooperative base station 20.
  • the scheduler unit 215 receives CoMP information from each base station (connected base station) 20 having a cell used as a connected cell by the user terminal 30 for each user terminal 30 using the own cell as a cooperative cell.
  • the CoMP information may not include acquisition information.
  • the scheduler unit 215 transmits the acquisition information to each of the cooperative base stations 20 independently of the CoMP information.
  • the scheduler unit 215 sends the execution request to the control signal generator 203 so that the execution request is transmitted to the user terminal 30 at a predetermined execution point for each of the user terminals 30 for which the CoMP condition is established. Output to.
  • the execution time is a time that is a predetermined first preparation time before the CoMP communication timing.
  • the execution request requests the user terminal 30 to execute a control information transmission process to be described later at the time of execution.
  • the execution request includes cooperative TP information.
  • the execution request is transmitted by PDCCH (Physical Downlink Control Channel).
  • the execution request is transmitted as an Aperiodic CQI trigger.
  • the scheduler unit 215 may output the execution request at an output time that is a predetermined second preparation time before the execution time.
  • the second preparation time may be set to a time required for the user terminal 30 to receive the execution request after the scheduler unit 215 outputs the execution request.
  • the functions of the user terminal 30 include a data signal generation unit 301, a data signal encoding / modulation unit 302, a control signal generation unit 303, a control signal encoding / modulation unit 304, and a reference A signal generation unit 305, an allocation / arrangement unit 306, and a transmission unit 307 are provided. Further, the functions of the user terminal 30 are a switching unit 308, an antenna unit 309, a receiving unit 310, a channel estimation unit 311, a control signal demodulation / decoding unit 312, a data signal demodulation / decoding unit 313, and a communication quality. An acquisition unit 314.
  • the function units 307 to 310 are realized by the wireless communication device 31 and the wireless signal processing device 32.
  • the functional units 301 to 306 and 311 to 314 are realized by the digital signal processing device 33.
  • the communication quality acquisition unit 314 is an example of a transmission process execution unit.
  • the data signal generator 301 generates a UL data signal (UL data signal). Specifically, the data signal generation unit 301 generates a UL data signal representing data input by the user of the user terminal 30.
  • the data signal encoding / modulating unit 302 performs encoding / modulating processing on the UL data signal generated by the data signal generating unit 301 based on the ULMCS identification information.
  • the ULMCS identification information is transmitted by the connecting base station 20 and is included in the DL control signal after the demodulation / decoding processing by the control signal demodulation / decoding unit 312 is executed.
  • the data signal encoding / modulating unit 302 outputs the UL data signal after the encoding / modulating process to the allocating / arranging unit 306.
  • the control signal generator 303 generates a UL control signal (UL control signal).
  • the control information represented by the UL control signal includes DL communication quality information, communication state information, reception confirmation (ACK or NACK) for DL transmission, a request for radio resource allocation, and the like.
  • ACK is an abbreviation for Acknowledgment.
  • NACK is an abbreviation for Negative ACK.
  • the control signal encoding / modulation unit 304 performs encoding / modulation processing on the UL control signal generated by the control signal generation unit 303 based on the ULMCS identification information.
  • the control signal encoding / modulating unit 304 outputs the UL control signal after the execution of the encoding / modulating process to the assigning / arranging unit 306.
  • the MCS identification information is transmitted by the connecting base station 20 and is included in the DL control signal after the demodulation / decoding processing by the control signal demodulation / decoding unit 312 is executed.
  • the reference signal generation unit 305 generates a UL reference signal.
  • a UL reference signal may also be referred to as a UL reference signal.
  • the UL reference signal is Sounding RS (SRS).
  • the allocation / arrangement unit 306 based on the UL allocation information, the UL data signal output from the data signal encoding / modulation unit 302, the UL control signal output from the control signal encoding / modulation unit 304, and the reference signal
  • the UL reference signal generated by the generation unit 305 is multiplexed.
  • the UL assignment information is transmitted by the connecting base station 20 and is included in the DL control signal after the demodulation / decoding processing by the control signal demodulation / decoding unit 312 is executed.
  • Allocation / arrangement section 306 outputs the multiplexed signal (baseband signal) to transmission section 307.
  • the transmission unit 307 converts the baseband signal from the frequency domain to the time domain by performing IFFT processing on the baseband signal output from the allocation / arrangement unit 306. Transmitting section 307 converts the converted baseband signal into a radio signal, and outputs the converted radio signal to switching section 308.
  • the switching unit 308 is also called an antenna duplexer.
  • the switching unit 308 connects the antenna unit 309 and the transmission unit 307 during a period for transmitting a radio signal, and connects the antenna unit 309 and the reception unit 310 during a period for receiving a radio signal.
  • the antenna unit 309 transmits the radio signal output from the transmission unit 307 to the external space via the antenna.
  • the antenna unit 309 receives a radio signal in the external space via the antenna and outputs the received radio signal to the receiving unit 310.
  • the receiving unit 310 converts the radio signal output from the antenna unit 309 into a baseband signal.
  • the receiving unit 310 converts the baseband signal from the time domain to the frequency domain by performing FFT processing on the converted baseband signal.
  • the channel estimation unit 311 determines the DL channel state (DL channel state) based on the DL reference signal included in the baseband signal converted by the reception unit 310 for each cell including the position of the terminal 30 itself. Is estimated. Specifically, the channel estimation unit 311 estimates the DL channel state by estimating the transfer function in the DL channel between the own terminal (user terminal) 30 and the base station 20 for each cell.
  • the control signal demodulation / decoding unit 312 performs the baseband signal converted by the receiving unit 310 on the basis of the DLMCS specifying information, the DL allocation information, and the DL channel state estimated by the channel estimating unit 311. Demodulation / decoding processing is executed. Thereby, the control signal demodulation / decoding unit 312 acquires the DL control signal from the baseband signal.
  • the demodulation / decoding process includes a process of demodulating the DL control signal and an error correction process based on an error correction code added to the DL control signal.
  • the demodulation / decoding process may include an error detection process based on an error detection code added to the DL control signal.
  • the DLMCS identification information and the DL allocation information are transmitted by the connecting base station 20 and are included in the DL control signal after the demodulation / decoding processing by the control signal demodulation / decoding unit 312 is executed.
  • the data signal demodulation / decoding unit 313 performs the baseband signal converted by the reception unit 310 based on the DLMCS identification information, the DL allocation information, and the DL channel state estimated by the channel estimation unit 311. Demodulation / decoding processing is executed. As a result, the data signal demodulation / decoding unit 313 acquires the DL data signal from the baseband signal.
  • the demodulation / decoding process includes a process of demodulating the DL data signal and an error correction process based on an error correction code added to the DL data signal.
  • the demodulation / decoding process may include an error detection process based on an error detection code added to the DL data signal.
  • the DLMCS identification information and the DL allocation information are transmitted by the connecting base station 20 and are included in the DL control signal after the demodulation / decoding processing by the control signal demodulation / decoding unit 312 is executed.
  • the communication quality acquisition unit 314 executes a communication quality transmission process every time a DL reference signal is received. Note that the communication quality acquisition unit 314 may execute a communication quality transmission process every time a predetermined communication quality transmission cycle elapses.
  • the communication quality transmission process includes a process of acquiring DL communication quality information for each of the cells including the position of the terminal 30 based on the DL channel state. Further, the communication quality transmission process includes a process of outputting the DL communication quality information to the control signal generation unit 303 so that the acquired DL communication quality information is transmitted to the connecting base station 20.
  • the DL channel state is estimated by the channel estimation unit 311 based on a radio signal in a cell to be acquired.
  • the DL communication quality information represents, for each cell including the position of the terminal 30 itself, a cell identifier for identifying the cell, and communication quality between the base station 20 and the user terminal 30 in the cell. Cell-by-cell quality information.
  • the control information transmission process includes a process of acquiring communication state information for each of a plurality of cells including a cooperative cell identified by a cell identifier included in the cooperative TP information included in the execution request and a connected cell. .
  • the communication quality acquisition unit 314 selects a precoding matrix from the precoding matrix candidates stored in advance based on the DL channel state (DL channel estimation value). In this example, the communication quality acquisition unit 314 selects the precoding matrix so that the SINR of the signal after the demodulation / decoding process is maximized.
  • the DL channel state is estimated by the channel estimation unit 311. Then, the communication quality acquisition unit 314 generates (acquires) communication state information including matrix specifying information for specifying the selected precoding matrix.
  • control information transmission process includes a process of outputting the communication state information to the control signal generation unit 303 so that the communication state information acquired for each of the plurality of cells is transmitted to the connected base station 20.
  • the communication status information is transmitted by PUSCH (Physical Uplink Shared Channel).
  • the position of the user terminal # 1 is included in each of the cell of the base station # 1, the cell of the base station # 2, and the cell of the base station # 3, and the base station # 1 has Assume that the user terminal # 1 uses a cell as a connected cell. Furthermore, it is assumed that the CoMP condition is satisfied.
  • Each base station 20 transmits a DL reference signal every time a predetermined DL reference signal transmission cycle elapses.
  • each user terminal 30 transmits a UL reference signal every time a predetermined UL reference signal transmission cycle elapses.
  • the user terminal # 1 executes the communication quality information transmission process shown by the flowchart in FIG. Specifically, when the user terminal # 1 starts executing the communication quality information transmission process, the user terminal # 1 stands by until a DL reference signal is received in each cell (each cell) including the own terminal 30-1 (FIG. 8). Step S201).
  • user terminal # 1 receives the DL reference signal in each cell (steps S101 to S103 in FIG. 6). Accordingly, the user terminal # 1 determines “Yes” and acquires DL communication quality information in each cell (step S104 in FIG. 6 and step S202 in FIG. 8). Next, the user terminal # 1 transmits the acquired DL communication quality information to the connecting base station # 1 (step S105 in FIG. 6 and step S203 in FIG. 8). Then, the user terminal # 1 returns to step S201 in FIG. 8, and repeatedly executes the processes of steps S201 to S203.
  • the connecting base station # 1 executes the acquisition information acquisition process shown by the flowchart in FIG. Specifically, when the connection base station # 1 starts executing the acquisition information acquisition process, the connection base station # 1 waits until a UL reference signal is received from the user terminal # 1 in the connection cell (step S301 in FIG. 9).
  • the connecting base station # 1 receives the UL reference signal in the connected cell from the user terminal # 1 (step S106 in FIG. 6). Accordingly, the connecting base station # 1 determines “Yes” and acquires UL communication quality information for the user terminal # 1 (step S107 in FIG. 6 and step S302 in FIG. 9).
  • the connecting base station # 1 acquires acquisition information for the user terminal # 1 based on the acquired UL communication quality information (step S108 in FIG. 6 and step S303 in FIG. 9). Then, the connecting base station # 1 returns to step S301 in FIG. 9 and repeatedly executes the processes of steps S301 to S303.
  • the connecting base station # 1 executes the CoMP condition determination process shown by the flowchart in FIG. Specifically, when the connected base station # 1 starts executing the CoMP condition determination process, the connected base station # 1 waits until DL communication quality information is received from the user terminal # 1 in the connected cell (step S401 in FIG. 10).
  • the connected base station # 1 receives the DL communication quality information from the user terminal # 1 (step S105 in FIG. 6), it determines “Yes” and the CoMP condition is established based on the DL communication quality information. It is determined whether or not (step S402 in FIG. 10). According to the above assumption, the CoMP condition is established for the user terminal # 1. Accordingly, the connecting base station # 1 determines “Yes” and determines a cooperative cell based on the DL communication quality information (step S403 in FIG. 10). In this example, it is assumed that each of the cell included in the base station # 2 and the cell included in the base station # 3 is determined as a cooperative cell.
  • the connecting base station # 1 sends CoMP information including the acquisition information acquired in step S303 in FIG. 9 to each of the base stations (cooperative base stations) # 2 and # 3 having the determined cooperative cell. Transmit (step S109 in FIG. 6, step S404 in FIG. 10). Thereafter, the connecting base station # 1 returns to step S401 and repeatedly executes the processes of steps S401 to S404. When the CoMP condition is not satisfied, the connecting base station # 1 determines “No” in step S402 in FIG. 10 and returns to step S401.
  • the connecting base station # 1 executes the connection data transmission process shown by the flowchart in FIG. Specifically, when the connection base station # 1 starts executing the connection data transmission process, the connection base station # 1 waits until the request transmission timing (in this example, the execution time) arrives (step S501 in FIG. 11).
  • the request transmission timing in this example, the execution time
  • the connecting base station # 1 determines “Yes” and transmits an execution request to the user terminal # 1 (step S110 in FIG. 6 and step S502 in FIG. 11). Then, the connecting base station # 1 waits until it receives communication state information from the user terminal # 1 in the connected cell (step S503 in FIG. 11).
  • the coordinated base station # 2 executes the coordinated data transmission process shown by the flowchart in FIG. Specifically, when the cooperative base station # 2 starts executing the cooperative data transmission process, it waits until CoMP information is received (step S601 in FIG. 12). When the coordinated base station # 2 receives the CoMP information from the connected base station # 1 (step S109 in FIG. 6), it determines “Yes” and waits until the communication state information is received (in FIG. 12). Step S602).
  • This communication state information uses the radio resource specified by the allocation information included in the acquisition information included in the CoMP information (that is, the radio resource provided in the cell included in the connected base station # 1), thereby the user terminal # 1 is transmitted.
  • the user terminal # 1 executes the communication state information transmission process shown by the flowchart in FIG. Specifically, when the user terminal # 1 starts executing the communication state information transmission process, the user terminal # 1 stands by until an execution request is received in the connected cell (step S701 in FIG. 13). And user terminal # 1 will determine with "Yes", if an execution request is received in a connection cell (step S110 of FIG. 7), and will transmit a DL reference signal in each of a connection cell and a cooperation cell (each cell). Wait until it is received (step S702 in FIG. 13).
  • user terminal # 1 receives the DL reference signal in each cell (steps S111 to S113 in FIG. 7). Accordingly, the user terminal # 1 determines “Yes” and estimates the DL channel state in each cell (step S114 in FIG. 7 and step S703 in FIG. 13). Next, user terminal # 1 selects a precoding matrix for each cell based on the estimated DL channel state (step S115 in FIG. 7 and step S704 in FIG. 13).
  • user terminal # 1 generates communication state information including matrix specifying information for specifying the selected precoding matrix for each cell, and transmits the generated communication state information in the connected cell. (Step S116 in FIG. 7 and Step S705 in FIG. 13). Then, the user terminal # 1 returns to step S701 in FIG. 13 and repeatedly executes the processes of steps S701 to S705.
  • the connecting base station # 1 acquires communication state information directly from the radio signal transmitted in the connected cell by the user terminal # 1 based on the acquisition information acquired in step S303 of FIG.
  • the communication state information is received (step S116 in FIG. 7).
  • the coordinated base stations # 2 and # 3 receive the communication status information by acquiring the communication status information directly from the radio signal based on the acquisition information received in step S601 of FIG. (Step S116 in FIG. 7).
  • the connecting base station # 1 determines “Yes” in step S503 in FIG. 11 and acquires the matrix specifying information for the own cell included in the received communication state information (step S117 in FIG. 7). , Step S504 in FIG. Then, the connecting base station # 1 executes precoding processing based on the precoding matrix specified by the acquired matrix specifying information (step S120 in FIG. 7 and step S505 in FIG. 11). Next, the connecting base station # 1 waits until the timing (CoMP communication timing) represented by the communication timing information included in the CoMP information arrives (step S506 in FIG. 11).
  • the coordinated base station # 2 determines “Yes” in step S602 in FIG. 12, and acquires matrix specifying information for the own cell included in the received communication state information (step S118 in FIG. 7). , Step S603 in FIG. Then, the coordinated base station # 2 performs precoding processing based on the precoding matrix specified by the acquired matrix specifying information (step S121 in FIG. 7 and step S604 in FIG. 12). Next, the coordinated base station # 2 waits until the CoMP communication timing arrives (step S605 in FIG. 12).
  • the coordinated base station # 3 determines “Yes” in step S602 in FIG. 12, and acquires matrix specifying information for the own cell included in the received communication state information (step S119 in FIG. 7). , Step S603 in FIG. Then, the coordinated base station # 3 performs precoding processing based on the precoding matrix specified by the acquired matrix specifying information (step S122 in FIG. 7 and step S604 in FIG. 12). Next, the coordinated base station # 3 waits until the CoMP communication timing arrives (step S605 in FIG. 12).
  • the connecting base station # 1 determines “Yes” in step S506 of FIG. Then, the connecting base station # 1 transmits the DL data signal generated by performing the precoding process to the user terminal # 1 (step S123 in FIG. 7 and step S507 in FIG. 11). Thereafter, the connection base station # 1 ends the connection data transmission process of FIG.
  • the coordinated base station # 2 determines “Yes” in step S605 of FIG. Then, the coordinated base station # 2 transmits the DL data signal generated by performing the precoding process to the user terminal # 1 (step S124 in FIG. 7 and step S606 in FIG. 12).
  • the coordinated base station # 3 determines “Yes” in step S605 of FIG. Then, the coordinated base station # 3 transmits the DL data signal generated by performing the precoding process to the user terminal # 1 (step S125 in FIG. 7 and step S606 in FIG. 12).
  • user terminal # 1 receives the DL data signal which base station # 1, base station # 2, and base station # 3 transmitted by CoMP communication.
  • the communication system 1 is preferably configured to repeatedly execute DL data signal transmission by CoMP communication while the CoMP condition is satisfied.
  • each of the plurality of base stations 20 has one cell (connected cell or cooperative cell).
  • the case where one base station 20 has a connection cell and a cooperation cell, and the case where one base station 20 has two or more cooperation cells can be demonstrated similarly.
  • the connecting base station # 1 is controlled from the radio signal transmitted by the user terminal # 1 in the connected cell based on the predetermined acquisition information. Get information. Furthermore, the communication system 1 notifies the acquisition information to each of the coordinated base stations # 2 and # 3. In addition, the user terminal # 1 acquires, for each of the plurality of cells, communication state information corresponding to the state of communication in the cell, and the communication state acquired for each of the plurality of cells. A control information transmission process for transmitting a radio signal representing control information including information is executed.
  • each of the coordinated base stations # 2 and # 3 acquires control information from the radio signal transmitted by the user terminal # 1 in the connected cell based on the notified acquisition information.
  • the communication system 1 controls the execution of cooperative communication for each of a plurality of cells based on communication state information included in the acquired control information.
  • the cooperative base station 20 directly transmits the cooperative cell from the radio signal transmitted by the user terminal 30 without the communication state information being exchanged between the connecting base station 20 and the other base station 20.
  • Communication state information for can be acquired.
  • the execution of the cooperative communication can be controlled based on the communication state information appropriately reflecting the actual communication state.
  • the communication state information includes matrix specifying information for specifying a precoding matrix.
  • the communication system 1 controls the execution of the cooperative communication by precoding the data signal based on the matrix specifying information included in the communication state information.
  • the data signal can be precoded based on the matrix specifying information in which the actual communication state is appropriately reflected. As a result, even when the communication state in each cell changes within a relatively short time, it is possible to avoid a decrease in reception quality at the user terminal 30.
  • the acquisition information includes allocation information and MCS identification information.
  • the allocation information is information for specifying a portion allocated to the user terminal # 1 among the radio resources provided in the connected cell.
  • the MCS specifying information is information for specifying the MCS used for transmitting a radio signal by the user terminal # 1 using the portion. According to this, each base station 20 can reliably acquire control information from the radio signal transmitted by the user terminal 30.
  • the user terminal # 1 performs the control information transmission process at an execution time that is a predetermined first preparation time before the cooperative communication timing at which the cooperative communication is executed. Execute.
  • each of the base stations 20 acquires control information including communication state information from the radio signal transmitted by the user terminal # 1 at the time of execution.
  • a predetermined preparation time is required from the time when the base station 20 acquires the communication state information to the start of the cooperative communication. Therefore, as in the above configuration, the communication state information that more appropriately reflects the actual communication state is obtained by acquiring the communication state information at the execution time that is the first preparation time before the cooperative communication timing.
  • the execution of cooperative communication can be controlled based on the above.
  • the connecting base station # 1 requests the user terminal # 1 to execute the control information transmission process at the time of execution. Furthermore, the user terminal # 1 executes a control information transmission process in response to the request. According to this, the user terminal 30 can execute the control information transmission process at the time of execution without notifying the user terminal 30 of the cooperative communication timing in advance.
  • the communication system 1 is configured to execute a process for performing cooperative communication independently for each user terminal 30.
  • the communication system 1 may be configured to execute a process for performing cooperative communication independently for each resource block (RB; Resource Block) that is a unit of radio resources allocated to the user terminal 30.
  • RB Resource Block
  • the base station 20 may include an RRH (Remote Radio Head), and may be configured to form a cell by RRH.
  • RRH Remote Radio Head
  • the execution request may not include the cooperative TP information.
  • the user terminal 30 may transmit communication state information for each of the plurality of cells. Further, the user terminal 30 may transmit the communication state information only to a cell whose DL communication quality information satisfies a predetermined communication quality condition.
  • the communication state information may not include the matrix specifying information.
  • the communication state information may include DL communication quality information or DL channel state, and each base station 20 may select a precoding matrix based on the communication state information.
  • the communication system 1 is configured such that the base station 20 determines the MCS and notifies the user terminal 30 of the determined MCS.
  • the communication system 1 may be configured such that the user terminal 30 determines the MCS according to the same algorithm as the base station 20 (specifically, the scheduler unit 215).
  • the communication system 1 which concerns on 1st Embodiment, although the user terminal 30 transmitted the communication status information with respect to all the cooperation cells, you may transmit the communication status information only with respect to some cooperative cells.
  • At least part of reception of a DL reference signal, estimation of a DL channel state, and selection of a precoding matrix is an execution request. It may be performed before transmission (step S110).
  • the connecting base station 20 notifies the user terminal 30 of the cooperative communication timing (CoMP communication timing) and the user terminal 30 performs CoMP communication with respect to the communication system according to the first embodiment.
  • the difference is that the communication state information transmission process is executed immediately before the timing.
  • this difference will be mainly described.
  • symbol used in the said 1st Embodiment is the same or substantially the same.
  • the communication system 1 according to the second embodiment includes a base station 20A in place of the base station 20 according to the first embodiment.
  • the function of the base station 20A is a function obtained by replacing the scheduler unit 215 with the scheduler unit 215A in the function of the base station 20 according to the first embodiment.
  • the scheduler unit 215A is an example of a timing notification unit.
  • the scheduler unit 215A has the same function as the scheduler unit 215 except that it outputs communication timing information instead of outputting an execution request. Specifically, the scheduler unit 215A transmits the communication timing information to the user terminal 30 that satisfies the CoMP condition so that the communication timing information is transmitted to the user terminal 30. Output to.
  • the communication timing information includes cooperative TP information.
  • the communication system 1 according to the second embodiment includes a user terminal 30 ⁇ / b> A instead of the user terminal 30 according to the first embodiment.
  • the function of the user terminal 30A is a function in which the communication quality acquisition unit 314 is replaced with the communication quality acquisition unit 314A in the function of the user terminal 30 according to the first embodiment.
  • the communication quality acquisition unit 314A is an example of a transmission process execution unit.
  • the communication quality acquisition unit 314A acquires the communication quality except that the timing based on the communication timing information received from the base station 20A is used as the timing for executing the control information transmission process instead of the timing at which the execution request is received. It has the same function as the unit 314. Specifically, the communication quality acquisition unit 314A executes the control information transmission process at a state transmission timing that is a predetermined third preparation time before the CoMP communication timing represented by the communication timing information.
  • the communication system 1 executes a process in which step S110 of the process illustrated in FIG. 7 is replaced with step S801. Further, as illustrated in FIG. 17, the user terminal 30A according to the second embodiment executes a process in which step S701 of the process illustrated in FIG. 13 is replaced with step S901 and step S902.
  • the connected base station # 2 transmits the user terminal # in the connected cell. Communication timing information is transmitted to 1 (step S801 in FIG. 16).
  • the user terminal # 1 when the user terminal # 1 starts executing the communication state information transmission process shown in FIG. 17, the user terminal # 1 waits until the communication timing information is received in the connected cell (step S901 in FIG. 17). Then, when the user terminal # 1 receives the communication timing information in the connected cell (step S801 in FIG. 16), it determines “Yes” and waits until the state transmission timing arrives (step S902 in FIG. 17). .
  • the user terminal # 1 determines “Yes”, and executes the processes of steps S702 to S705 of FIG. 17 in the same manner as the process shown in FIG. Thereafter, the user terminal # 1 returns to step S901 in FIG. 17 and repeatedly executes the processes in steps S901 to S705. That is, the communication system 1 executes the processes of steps S111 to S125 of FIG. 16, similarly to the process shown in FIG.
  • the communication system 1 according to the second embodiment can achieve the same operations and effects as the communication system 1 according to the first embodiment. Furthermore, the communication system 1 according to the second embodiment notifies the user terminal 30A of CoMP communication timing at which CoMP communication is executed. In addition, the user terminal 30A performs a control information transmission process based on the notified CoMP communication timing.
  • the user terminal 30A executes the control information transmission process at the execution time without the connecting base station 20A requesting the user terminal 30A to execute the control information transmission process at a timing immediately before the execution time. be able to.
  • the connecting base station 20A transmits the communication timing information to the user terminal 30A.
  • a device (upper device) on the upper side (communication network) side than the base station 20A. May transmit the communication timing information to the user terminal 30A.
  • the host device is a switching station 10, a gateway device, or a control device that controls the base station 20A.
  • the communication timing information is transmitted in a layer higher than the physical layer (for example, a layer such as RRC, PDCP, MAC, or RLC).
  • RRC is an abbreviation for Radio Resource Control.
  • PDCP is an abbreviation for Packet Data Convergence Protocol.
  • MAC is an abbreviation for Medium Access Control.
  • RLC is an abbreviation for Radio Link Control.
  • the communication timing information may be included in information called CQI-ReportAperiodic-r10.
  • the communication system according to the third embodiment differs from the communication system according to the first embodiment in the following differences.
  • the difference is that the user terminal 30 periodically executes communication state information transmission processing, and each base station 20 performs cooperative communication based on the latest communication state information acquired at the cooperative communication timing (CoMP communication timing). It is a point that controls execution.
  • this difference will be mainly described.
  • symbol used in the said 1st Embodiment is the same or substantially the same.
  • the communication system 1 according to the third embodiment includes a base station 20B instead of the base station 20 according to the first embodiment.
  • the functions of the base station 20B are the functions of the base station 20 according to the first embodiment, in which the scheduler unit 215 is replaced with the scheduler unit 215B, and the data signal encoding / modulating unit 202 is replaced with the data signal encoding / modulating unit 202B. It is a function replaced with.
  • the scheduler unit 215B has the same function as the scheduler unit 215 except that it outputs cooperative TP information instead of outputting an execution request. Specifically, the scheduler unit 215B transmits the coordinated TP information to the control signal generator 203 so that the coordinated TP information is transmitted to the user terminal 30 for each user terminal 30 for which the CoMP condition is established. Output to.
  • the data signal encoding / modulating unit 202B uses the precoding matrix specified by the matrix specifying information included in the communication state information included in the latest control information among the already acquired control information at the execution processing timing. Except for this point, it has the same function as the data signal encoding / modulating unit 202.
  • the execution process timing is a timing that is a predetermined fourth preparation time before the CoMP communication timing represented by the communication timing information.
  • the data signal encoding / modulating unit 202B is an example of a part of the control means.
  • the communication system 1 according to the third embodiment includes a user terminal 30B instead of the user terminal 30 according to the first embodiment.
  • the function of the user terminal 30B is a function obtained by replacing the communication quality acquisition unit 314 with the communication quality acquisition unit 314B in the function of the user terminal 30 according to the first embodiment.
  • the communication quality acquisition unit 314B is an example of a transmission process execution unit.
  • the communication quality acquisition unit 314B is the same as the communication quality acquisition unit 314 except that the timing at which the DL reference signal is received is used instead of the timing at which the execution request is received as the timing at which the control information transmission process is executed. It has the function of. Specifically, the communication quality acquisition unit 314B performs a control information transmission process each time a DL reference signal is received in each of the connected cell and the cooperative cell (each cell). That is, in this example, the cycle in which the DL reference signal is transmitted is an example of the execution cycle.
  • the communication system 1 executes a process in which step S110 of the process shown in FIG. 7 is replaced with step S1001. Further, as illustrated in FIG. 21, the user terminal 30 ⁇ / b> B according to the third embodiment executes a process in which step S ⁇ b> 701 of the process illustrated in FIG. 13 is deleted.
  • the connecting base station 20B according to the third embodiment executes a process in which steps S501 to S504 of the process shown in FIG. 11 are replaced with steps S1101 to S1103.
  • the coordinated base station 20B according to the third embodiment executes a process in which steps S602 to S603 of the process shown in FIG. 12 are replaced with steps S1201 to S1203.
  • the connected base station # 2 transmits the user terminal # in the connected cell.
  • the cooperative TP information is transmitted to 1 (step S1001 in FIG. 20).
  • connection base station # 1 when the connection base station # 1 starts executing the connection data transmission process shown in FIG. 22, the connection base station # 1 waits until it receives communication state information from the user terminal # 1 in the connection cell (step S1101 in FIG. 22).
  • the coordinated base station # 2 executes the coordinated data transmission process shown by the flowchart in FIG.
  • the coordinated base station # 3 operates in the same manner as the coordinated base station # 2. Specifically, when the cooperative base station # 2 starts executing the cooperative data transmission process, the cooperative base station # 2 waits until receiving CoMP information (step S601 in FIG. 23). When the coordinated base station # 2 receives the CoMP information from the connected base station # 1 (step S109 in FIG. 6), it determines “Yes” and waits until the communication state information is received (in FIG. 23). Step S1201).
  • the process of steps S702 to S705 in FIG. 21 is repeatedly executed as in the process shown in FIG. That is, the user terminal # 1 executes the control information transmission process every time the DL reference signal is received (each cycle of the DL reference signal elapses) in each of the connected cell and the cooperative cell (each cell). . Thereby, user terminal # 1 transmits the communication state information including the matrix specifying information in the connected cell (step S116 in FIG. 20 and step S705 in FIG. 21).
  • the connecting base station # 1 receives the communication status information by acquiring the communication status information directly from the radio signal transmitted in the connected cell by the user terminal # 1 based on the acquisition information ( Step S116 in FIG.
  • the coordinated base stations # 2 and # 3 receive the communication status information by acquiring the communication status information directly from the radio signal based on the acquisition information (step S116 in FIG. 7).
  • the connecting base station # 1 determines “Yes” in step S1101 of FIG. 22 and acquires the matrix specifying information for the own cell included in the received communication state information (step S117 of FIG. 7). , Step S1102 of FIG. Then, the connecting base station # 1 determines whether or not the processing execution timing has arrived (step S1103 in FIG. 22).
  • the connecting base station # 1 returns to step S1101. That is, the connecting base station # 1 repeatedly executes the processes of steps S1101 to S1103 until the process execution timing comes.
  • the coordinated base station # 2 determines “Yes” in step S1201 of FIG. 23, and acquires matrix specifying information for the own cell included in the received communication state information (step S118 of FIG. 7). , Step S1202 in FIG. Then, the coordinated base station # 2 determines whether or not the processing execution timing has arrived (step S1203 in FIG. 23).
  • the coordinated base station # 2 returns to step S1201. That is, the coordinated base station # 2 repeatedly executes the processes of steps S1201 to S1203 until the process execution timing comes. That is, the communication system 1 repeatedly executes the processes of steps S111 to S119 in FIG. Note that the processing in steps S111 to S119 in FIG. 20 is the same as the processing in steps S111 to S119 in FIG.
  • the connecting base station # 1 determines “Yes” in step S1103 in FIG. 22, and similarly to the process shown in FIG. 11, the process in steps S505 to S507 in FIG. Execute.
  • the coordinated base station # 2 determines “Yes” in step S1203 in FIG. 23, and in the same manner as the process illustrated in FIG. 12, the process in steps S604 to S606 in FIG. Execute the process. That is, the communication system 1 executes the processes of steps S120 to S125 of FIG. 20, similarly to the process shown in FIG.
  • the communication system 1 according to the third embodiment can achieve the same operations and effects as the communication system 1 according to the first embodiment.
  • the user terminal 30B executes a control information transmission process every time a predetermined execution cycle elapses. Furthermore, each time the base station 20B transmits a radio signal from the user terminal 30B by executing the control information transmission process, the base station 20B acquires control information including communication state information from the radio signal. In addition, each base station 20B controls the execution of cooperative communication based on the communication state information included in the latest control information among the control information that has already been acquired.
  • the connecting base station 20B does not request the user terminal 30B to execute the control information transmission process, and cooperates based on the communication state information appropriately reflecting the actual communication state. Execution of communication can be controlled.
  • the wireless communication system 4 includes a first wireless communication device 41, a second wireless communication device 42, and a third wireless communication device 43.
  • the wireless communication system 4 is configured such that the first wireless communication device 41 and the second wireless communication device 42 perform cooperative communication with the third wireless communication device 43.
  • the first wireless communication device 41 includes a transmission unit 411 and a reception unit 412.
  • the transmission unit 411 transmits a signal to the second wireless communication device 42 by wireless or wired. Further, the transmission unit 411 transmits a signal to the third wireless communication device 43 by wireless.
  • the receiving unit 412 receives a signal from the third wireless communication device 43 wirelessly.
  • the second wireless communication device 42 includes a transmission unit 421 and a reception unit 422.
  • the transmission unit 421 transmits a signal to the first wireless communication device 41 by wireless or wired. Further, the transmission unit 421 transmits a signal to the third wireless communication device 43 by wireless.
  • the receiving unit 422 receives a signal from the third wireless communication device 43 by wireless.
  • the third wireless communication device 43 includes a transmission unit 431 and a reception unit 432.
  • the transmission unit 431 transmits a signal to the first wireless communication device 41 and the second wireless communication device 42 by wireless.
  • the receiving unit 432 receives signals from the first wireless communication device 41 and the second wireless communication device 42 by wireless.
  • the first wireless communication device 41 transmits a second control signal to the third wireless communication device 43 (step S1301 in FIG. 25).
  • the second control signal includes MCS identification information and allocation information.
  • the first wireless communication device 41 transmits a third control signal to the second wireless communication device 42 (step S1302 in FIG. 25).
  • the third control signal includes first information and second information.
  • the first information is information for receiving the first control signal transmitted by the third wireless communication device 43.
  • the first information includes MCS identification information and allocation information.
  • the second information is information for implementing cooperative communication.
  • the second information includes at least one of information indicating the timing at which the cooperative communication is executed and information for specifying a radio resource used for executing the cooperative communication.
  • the processing in step S1301 and the processing in step S1302 may be executed in the reverse order to the order shown in FIG. Moreover, the process of step S1301 and the process of step S1302 may be performed simultaneously.
  • the third wireless communication device 43 transmits the first control signal to each of the first wireless communication device 41 and the second wireless communication device 42 (step S1303 in FIG. 25).
  • the first control signal includes PMI.
  • each of the first wireless communication device 41 and the second wireless communication device 42 transmits a data signal to the third wireless communication device 43 so as to perform cooperative communication based on the first control signal. (Steps S1304 and S1305 in FIG. 25). Accordingly, the first wireless communication device 41 and the second wireless communication device 42 perform cooperative communication with the third wireless communication device 43.
  • the first wireless communication device 41 transmits the first wireless communication device 43 transmitted by the third wireless communication device 43 before performing cooperative communication.
  • Information for receiving the control signal and information for performing the cooperative communication are transmitted to the second wireless communication device 42. Thereby, the reception quality in the 3rd radio
  • the communication system is configured to execute JT as cooperative communication, but is configured to execute cooperative communication other than JT (for example, DCS, DPS, CS, or CB). It may be.
  • DCS is an abbreviation for Dynamic Cell Selection.
  • DPS is an abbreviation for Dynamic Point Selection.
  • CS is an abbreviation for Coordinated Scheduling.
  • CB is an abbreviation for Coordinated Beamforming.
  • the communication state information may include DL communication quality information instead of the matrix specifying information or in addition to the matrix specifying information.
  • each function of each device is realized by hardware such as a circuit.
  • each device has a computer that includes a processing device and a storage device that stores a program (software), and the processing device is configured to implement each function by executing the program. Also good.
  • the program may be stored in a computer-readable recording medium.
  • the recording medium is a portable medium such as a flexible disk, an optical disk, a magneto-optical disk, and a semiconductor memory.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

Dans le système de communication (1) de l'invention, à partir d'informations d'acquisition prescrites, une station de base de connexion (20) qui sert de cellule de connexion acquiert des informations de commande dans un signal sans fil émis par un terminal d'utilisateur (30) par l'intermédiaire de ladite cellule de connexion. Les informations d'acquisition sont envoyées à chaque station parmi un certain nombre de stations de base de coopération (20), chacune d'elle desservant une cellule de coopération. Le terminal d'utilisateur (30) mentionné ci-dessus exécute un processus d'émission d'informations de commande, dans lequel un signal sans fil qui représente des informations de commande contenant les informations d'état de communication acquises est émis pour chaque cellule. À partir des informations d'acquisition envoyées mentionnées ci-dessus, chaque station de base de coopération (20) acquiert des informations de commande dans le signal sans fil correspondant émis par le terminal d'utilisateur (30) par l'intermédiaire de la cellule de connexion. Pour chaque cellule, la station de base (20) desservant ladite cellule commande l'exécution d'une communication coopérative selon les informations d'état de communication contenues dans les informations de commande acquises.
PCT/JP2013/063058 2013-05-09 2013-05-09 Système de communication, procédé de communication, terminal d'utilisateur, procédé de commande, programme de commande, station de base de connexion, station de base de coopération et système de communication sans fil WO2014181429A1 (fr)

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PCT/JP2013/063058 WO2014181429A1 (fr) 2013-05-09 2013-05-09 Système de communication, procédé de communication, terminal d'utilisateur, procédé de commande, programme de commande, station de base de connexion, station de base de coopération et système de communication sans fil
PCT/JP2013/079419 WO2014181484A1 (fr) 2013-05-09 2013-10-30 Systeme de communication, procede de communication, terminal utilisateur, procede de commande, station de base de connexion, station de base de cooperation, et systeme de communication sans fil

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PCT/JP2013/063058 WO2014181429A1 (fr) 2013-05-09 2013-05-09 Système de communication, procédé de communication, terminal d'utilisateur, procédé de commande, programme de commande, station de base de connexion, station de base de coopération et système de communication sans fil

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PCT/JP2013/079419 WO2014181484A1 (fr) 2013-05-09 2013-10-30 Systeme de communication, procede de communication, terminal utilisateur, procede de commande, station de base de connexion, station de base de cooperation, et systeme de communication sans fil

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CN113938969B (zh) * 2020-06-29 2023-04-07 华为技术有限公司 通信方法、装置及计算机可读存储介质

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011078019A (ja) * 2009-10-01 2011-04-14 Sharp Corp 移動局装置、基地局装置、無線通信システム、通信方法、および制御プログラム
WO2012093555A1 (fr) * 2011-01-07 2012-07-12 株式会社エヌ・ティ・ティ・ドコモ Dispositif de terminal mobile, dispositif de station de base sans fil, et procédé de communication sans fil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011078019A (ja) * 2009-10-01 2011-04-14 Sharp Corp 移動局装置、基地局装置、無線通信システム、通信方法、および制御プログラム
WO2012093555A1 (fr) * 2011-01-07 2012-07-12 株式会社エヌ・ティ・ティ・ドコモ Dispositif de terminal mobile, dispositif de station de base sans fil, et procédé de communication sans fil

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