WO2018131078A1 - Station de base, terminal, système de communication radio et procédé de communication radio - Google Patents

Station de base, terminal, système de communication radio et procédé de communication radio Download PDF

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Publication number
WO2018131078A1
WO2018131078A1 PCT/JP2017/000508 JP2017000508W WO2018131078A1 WO 2018131078 A1 WO2018131078 A1 WO 2018131078A1 JP 2017000508 W JP2017000508 W JP 2017000508W WO 2018131078 A1 WO2018131078 A1 WO 2018131078A1
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WIPO (PCT)
Prior art keywords
signal
base station
terminal
unit
control unit
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PCT/JP2017/000508
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English (en)
Japanese (ja)
Inventor
大出　高義
義博 河▲崎▼
孝斗 江崎
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富士通株式会社
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Priority to PCT/JP2017/000508 priority Critical patent/WO2018131078A1/fr
Publication of WO2018131078A1 publication Critical patent/WO2018131078A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Definitions

  • the present invention relates to a base station, a terminal, a wireless communication system, and a wireless communication method.
  • a wireless communication system using OFDM Orthogonal Frequency Division Multiplexing
  • a terminal performs synchronization processing using a synchronization signal and a pilot signal (also referred to as a reference signal) from a base station, and performs selection of a cell in which the base station is defined. Thereafter, the terminal performs a random access procedure (radio line setting) for the base station based on the system information. As a result, a radio link between the base station and the terminal is established by random access.
  • OFDM Orthogonal Frequency Division Multiplexing
  • a system band is divided into a plurality of frequency bands, and radio resources are allocated to each frequency band.
  • the system band is one frequency band constituting the wireless communication system.
  • the system information includes radio resources, subcarrier intervals, symbol lengths, subframe lengths, and the like.
  • OFDM Frequency Division Multiple Access
  • the number of subcarriers, subcarrier interval, TTI (Transmission Time Interval), and number of symbols are the same in each frequency band.
  • TTI Transmission Time Interval
  • the symbol length, slot length, subframe length, and frame length are the same. Therefore, when OFDM is used, waveform shaping (filtering) is performed on the entire system band.
  • system information is the same within a system band. For this reason, the terminal performs synchronization processing with respect to the base station, and performs radio communication with the base station using the same system information notified in advance.
  • JP 2013-232910 A JP 2006-504367
  • the system band is divided into a plurality of frequency bands. Further, each frequency band is divided into a plurality of subcarrier groups (hereinafter referred to as SCG), and radio resources are allocated to each SCG.
  • the system band is one frequency band constituting the wireless communication system.
  • SCG may also be referred to as a cluster or a subcarrier block (SCB).
  • SCB subcarrier block
  • each SCG is composed of a plurality of subcarriers, and at least one of the number of subcarriers, subcarrier spacing, TTI, symbol length, and the like is different in each SCG. Therefore, when F-OFDM is used, waveform shaping (filtering) is performed for each SCG.
  • system information differs for each SCG.
  • the subcarrier interval and symbol length of the system information are different for each SCG.
  • the terminal since the synchronization timing differs for SCGs having different subcarrier intervals, symbol lengths, etc., the terminal cannot perform synchronization processing on the base station. As a result, the terminal cannot perform wireless communication with the base station.
  • the terminal performs a synchronization process for each SCG.
  • the wireless communication system includes a base station and a terminal that communicate using one system band.
  • the base station includes a radio network controller, a first controller, and a second controller.
  • the radio network controller allocates first and second subcarrier groups (hereinafter referred to as SCG) having different first and second symbol lengths of system information within the system band.
  • SCG first and second subcarrier groups
  • a 1st control part transmits the 1st signal for a terminal to synchronize in a 1st SCG to a terminal.
  • the second control unit transmits a second signal obtained by performing signal processing on the first signal so that the symbol length becomes the second symbol length.
  • the terminal can perform synchronization processing for each SCG.
  • FIG. 1 is a diagram illustrating an example of a wireless communication system.
  • FIG. 2 is a diagram illustrating an example of a base station when OFDM is used.
  • FIG. 3 is a diagram illustrating an example of a terminal when OFDM is used.
  • FIG. 4 is a diagram illustrating an example of a received signal processing unit when OFDM is used.
  • FIG. 5 is a diagram illustrating an example of a transmission signal processing unit when OFDM is used.
  • FIG. 6 is a diagram illustrating an example of a system band when OFDM is used.
  • FIG. 7 is a sequence showing an example of an operation at the time of setting a wireless line when using OFDM.
  • FIG. 8 is a diagram illustrating an example of a system band when F-OFDM is used in the wireless communication system according to the embodiment.
  • FIG. 9 is a diagram illustrating an example of each SCG when F-OFDM is used in the wireless communication system according to the embodiment.
  • FIG. 10 is a diagram illustrating an example of the OVSF code.
  • FIG. 11 is a diagram illustrating an example of a synchronization signal when the OVSF code is applied to LTE.
  • FIG. 12 is a diagram illustrating an example of the second synchronization signal in the time axis direction.
  • FIG. 13 is a diagram illustrating an example of the second synchronization signal in the subcarrier axis (frequency axis) direction.
  • FIG. 14 is a diagram illustrating an example of a terminal when F-OFDM is used in the wireless communication system according to the embodiment.
  • FIG. 10 is a diagram illustrating an example of the OVSF code.
  • FIG. 11 is a diagram illustrating an example of a synchronization signal when the OVSF code is applied to LTE.
  • FIG. 12 is a diagram illustrating an example of the second synchron
  • FIG. 15 is a diagram illustrating an example of a base station when F-OFDM is used in the wireless communication system according to the embodiment.
  • FIG. 16 is a diagram illustrating an example of a system information storage unit when F-OFDM is used in the wireless communication system according to the embodiment.
  • FIG. 17 is a diagram illustrating an example of a received signal processing unit when F-OFDM is used in the wireless communication system according to the embodiment.
  • FIG. 18 is a diagram illustrating an example of a transmission signal processing unit when F-OFDM is used in the wireless communication system according to the embodiment.
  • FIG. 19 is a diagram illustrating an example of a radio channel controller when F-OFDM is used in the radio communication system according to the embodiment.
  • FIG. 20 is a sequence illustrating an example of SCG addition processing as the operation of the wireless communication system according to the embodiment.
  • FIG. 21 is a sequence illustrating an example of the SCG change process as the operation of the wireless communication system according to the embodiment.
  • FIG. 22 is a flowchart illustrating an example of the SCG selection process as the operation of the wireless communication system according to the embodiment.
  • FIG. 23 is a diagram illustrating an example of a hardware configuration of the base station.
  • FIG. 24 is a diagram illustrating an example of a hardware configuration of the terminal.
  • F-OFDM Frtered-Orthogonal Frequency Division Multiplexing
  • OFDM Orthogonal Frequency Division Multiplexing
  • FIG. 1 is a diagram illustrating an example of a wireless communication system.
  • the wireless communication system includes a base station 100 and a terminal 200.
  • Base station 100 and terminal 200 perform wireless communication.
  • an MME (Mobility Management Entity) 41 an SGW (Serving Gateway) 42, and a PGW (Packet data network Gateway) 43 in LTE (Long Term Evolution) are provided.
  • the MME 41 is a gateway that performs network control.
  • the SGW 42 is a gateway that handles user data.
  • the PGW 43 is a gateway for connecting to an external Internet or the like.
  • the terminal 200 is, for example, a UE (User Equipment) in LTE.
  • the base station 100 is, for example, an eNB (evolved Node B) in LTE.
  • eNB evolved Node B
  • 5G the fifth generation mobile communication system
  • 5G adoption of New RAT (Radio Access Technology) as a new communication technology is being studied.
  • New RAT eNB is called 5GNB (5G base station) or gNB.
  • FIG. 2 is a diagram illustrating an example of the base station 100 when OFDM is used.
  • the base station 100 includes an antenna 101, a reception radio unit 102, a reception signal processing unit 103, a control signal extraction unit 104, a radio channel quality measurement unit 105, a radio channel control unit 106, a control signal generation unit 107, a system information storage unit 108, A transmission signal processing unit 109 and a transmission radio unit 110 are included.
  • the base station 100 includes a subcarrier generation unit 111, a pilot signal generation unit 112, and a synchronization signal generation unit 113.
  • the reception radio unit 102 operates under the control (dotted line in FIG. 2) from the radio line control unit 106.
  • Reception radio section 102 receives a signal transmitted from terminal 200 via antenna 101.
  • Reception radio section 102 amplifies the received signal and frequency-converts the amplified signal into a baseband signal.
  • Reception radio section 102 then outputs the frequency-converted signal to reception signal processing section 103.
  • the received signal processing unit 103 operates under the control (dotted line in FIG. 2) from the wireless line control unit 106.
  • the reception signal processing unit 103 receives the signal output from the reception wireless unit 102.
  • FIG. 4 is a diagram illustrating an example of a received signal processing unit when OFDM is used.
  • the received signal processing unit 103 includes an ADC (Analog to Digital Converter) 301, a CP (Cyclic Prefix) removal unit 302, an FFT (Fast Fourier Transform) unit 303, and a demodulation / decoding unit 304.
  • the CP is generally called a GI (Guard Interval) or a redundant part.
  • the ADC 301 converts the signal output from the reception wireless unit 102 into a digital signal. Then, the ADC 301 outputs the converted digital signal to the CP removal unit 302.
  • the CP removing unit 302 removes a CP (Cyclic Prefix) from the digital signal output from the ADC 301. Then, CP removing section 302 outputs the signal from which CP has been removed to FFT section 303.
  • CP Cyclic Prefix
  • the FFT unit 303 performs FFT on the signal output from the CP removal unit 302. As a result, the signal output from the CP removing unit 302 is converted from a time domain signal to a frequency domain signal. FFT section 303 outputs the signal subjected to the FFT to demodulation / decoding section 304.
  • the demodulation / decoding unit 304 demodulates the signal output from the FFT unit 303. Then, the demodulator / decoder 304 decodes the demodulated signal. Demodulation / decoding section 304 outputs the decoded signal.
  • the signal output from the received signal processing unit 103 includes a control signal and individual data (Dedicated data).
  • the control signal includes at least one of individual control information (Dedicated control information) and common control information (Common control information).
  • the individual data represents a data signal of the terminal 200.
  • Control signals and individual data are transmitted from the received signal processing unit 103 to the upper level.
  • the upper level corresponds to, for example, a MAC (Media Access Control) in LTE.
  • the control signal extraction unit 104 extracts a control signal from the signal output from the reception signal processing unit 103.
  • the control signal extraction unit 104 outputs the extracted control signal to the radio channel control unit 106.
  • the radio channel quality measurement unit 105 measures the radio channel quality based on the signal output from the received signal processing unit 103. Radio channel quality measurement section 105 then outputs the measured radio channel quality to radio channel control section 106 as uplink radio channel quality information.
  • the radio network controller 106 performs RRC (Radio Resource Control) layer processing based on the control signal output from the control signal extractor 104. That is, radio resource control is performed.
  • RRC Radio Resource Control
  • RRC is also called radio resource control or radio channel control.
  • Radio channel control unit 106 based on the downlink radio channel quality information included in the control signal output from the control signal extraction unit 104 and the uplink radio channel quality information output from the radio channel quality measurement unit 105, The scheduling described later is performed. Radio channel controller 106 outputs the scheduling result to control signal generator 107.
  • the control signal generation unit 107 generates a control signal based on the scheduling result output from the wireless line control unit 106.
  • the control signal generation unit 107 outputs the generated control signal to the transmission signal processing unit 109.
  • the pilot signal generator 112 generates a pilot signal sequence that represents a different pilot signal.
  • the pilot signal is, for example, a signal such as a reference signal (RS) in LTE.
  • Pilot signal generation section 112 outputs the generated pilot signal sequence to transmission signal processing section 109.
  • RS reference signal
  • the synchronization signal generator 113 generates a synchronization signal sequence that represents a different synchronization signal.
  • the synchronization signal generation unit 113 represents different synchronization signals by using the cell ID of the cell in which the base station 100 is defined and the slot number or subframe number used when transmitting the synchronization signal.
  • a synchronization signal train is generated.
  • the synchronization signal generation unit 113 outputs the generated synchronization signal sequence to the transmission signal processing unit 109.
  • the subcarrier generation unit 111 operates under the control (dotted line in FIG. 2) from the radio channel control unit 106.
  • the subcarrier generation unit 111 generates a subcarrier and outputs it to the transmission signal processing unit 109.
  • the transmission signal processing unit 109 operates under the control from the wireless line control unit 106 (dotted line in FIG. 2).
  • the transmission signal processing unit 109 is a data signal from the host, the control signal output from the control signal generation unit 107, the pilot signal sequence output from the pilot signal generation unit 112, and the synchronization signal generation unit 113.
  • the synchronization signal sequence and the subcarrier output from the subcarrier generation unit 111 are received.
  • FIG. 5 is a diagram illustrating an example of a transmission signal processing unit when OFDM is used.
  • the transmission signal processing unit 109 includes an encoding / modulation unit 401, a subcarrier mapping unit 402, and an IFFT (Inverse Fast Fourier Transform) unit 403.
  • the transmission signal processing unit 109 further includes a CP (Cyclic Prefix) adding unit 404 and a DAC (Digital to Analog Converter) 405.
  • CP Cyclic Prefix
  • DAC Digital to Analog Converter
  • the encoding / modulation unit 401 outputs the data signal from the higher level, the control signal output from the control signal generation unit 107, the pilot signal sequence output from the pilot signal generation unit 112, and the synchronization signal generation unit 113.
  • the synchronized signal sequence is encoded.
  • the encoding / modulating unit 401 modulates the encoded signal.
  • Encoding / modulating section 401 outputs the modulated signal to subcarrier mapping section 402.
  • the subcarrier mapping unit 402 receives the signal output from the encoding / modulation unit 401 and the subcarrier output from the subcarrier generation unit 111.
  • Subcarrier mapping section 402 maps the modulation symbol of the signal modulated by encoding / modulation section 401 to the subcarrier, or multiplies the modulation symbol and the subcarrier.
  • subcarrier mapping section 402 maps the generated synchronization signal as follows in the subframe in which the synchronization signal is transmitted.
  • the subcarrier mapping unit 402 generates 6RB (Resource Block) at the center of the system band used for communication in the subcarrier axis direction, and generates the last symbol or the second symbol from the end of the subframe in the time axis direction. Mapping the synchronized signal.
  • Subcarrier mapping section 402 outputs the mapped signal to IFFT section 403.
  • the IFFT unit 403 receives the signal output from the subcarrier mapping unit 402. Then, IFFT section 403 performs IFFT on the modulation symbol of the signal mapped by subcarrier mapping section 402. As a result, the symbol of the signal output from subcarrier mapping section 402 is converted from a modulation symbol in the frequency domain to an effective symbol in the time domain. IFFT section 403 outputs the signal subjected to IFFT to CP adding section 404.
  • CP adding section 404 generates an OFDM symbol by adding a CP (Cyclic Prefix) to the signal output from IFFT section 403.
  • CP adding section 404 converts the generated OFDM symbol into a predetermined radio frequency. Then, CP adding section 404 outputs the converted signal to DAC 405.
  • the DAC 405 converts the signal output from the CP adding unit 404 into an analog signal. Then, the DAC 405 outputs the converted analog signal to the transmission radio unit 110.
  • the transmission radio unit 110 operates under the control (dotted line in FIG. 2) from the radio line control unit 106.
  • Transmission radio section 110 transmits the signal output from transmission signal processing section 109 from antenna 101.
  • the system information storage unit 108 stores system information. System information will be described later.
  • FIG. 3 is a diagram illustrating an example of a terminal 200 when using OFDM.
  • the terminal 200 includes an antenna 201, a reception radio unit 202, a reception signal processing unit 203, a control signal extraction unit 204, a radio channel quality measurement unit 205, a radio channel control unit 206, a control signal generation unit 207, a system information storage unit 208, a transmission A signal processing unit 209 and a transmission radio unit 210 are included.
  • terminal 200 includes subcarrier generation section 211, pilot signal generation section 212, synchronization signal generation section 213, pilot signal extraction section 214, synchronization signal extraction section 215, and synchronization processing section 216.
  • the reception wireless unit 202 operates under the control from the wireless line control unit 206 (dotted line in FIG. 3).
  • the reception radio unit 202 receives a signal transmitted from the base station 100 via the antenna 201.
  • Reception radio section 202 amplifies the received signal and frequency-converts the amplified signal into a baseband signal. Then, reception radio section 202 outputs the frequency-converted signal to reception signal processing section 203.
  • the reception signal processing unit 203 operates under the control (dotted line in FIG. 3) from the wireless line control unit 206.
  • Reception signal processing section 203 demodulates the signal output from reception radio section 202 and decodes the demodulated signal.
  • the configuration of reception signal processing section 203 of terminal 200 is the same as the configuration of reception signal processing section 103 of base station 100, and thus detailed description thereof is omitted.
  • Reception signal processing section 203 outputs the decoded signal to control signal extraction section 204 and radio channel quality measurement section 205.
  • the signal output from the received signal processing unit 203 includes a control signal, a data signal, a synchronization signal sequence, a pilot signal sequence, and the like.
  • the control signal is a signal related to data transmission.
  • the control signal and the data signal are transmitted from the received signal processing unit 203 to the upper level.
  • the upper level corresponds to the MAC in LTE, for example.
  • the control signal extraction unit 204 extracts a control signal from the signal output from the reception signal processing unit 203.
  • the control signal extraction unit 204 outputs the extracted control signal to the radio channel control unit 206.
  • the synchronization signal extraction unit 215 extracts a synchronization signal sequence from the signal output from the reception signal processing unit 203.
  • the synchronization signal extraction unit 215 outputs the extracted synchronization signal sequence to the synchronization processing unit 216.
  • the pilot signal extraction unit 214 extracts a pilot signal sequence from the signal output from the reception signal processing unit 203. Pilot signal extraction section 214 outputs the extracted pilot signal sequence to radio channel quality measurement section 205 and synchronization processing section 216.
  • the terminal 200 does not know which base station (cell) the extracted synchronization signal sequence is the synchronization signal sequence transmitted from. Also, the terminal 200 does not grasp the transmission source base station (or cell, cell ID).
  • the synchronization signal generation unit 213 generates a plurality of synchronization signal sequences.
  • the synchronization signal generation unit 113 outputs the generated plurality of synchronization signal sequences to the synchronization processing unit 216.
  • the synchronization processing unit 216 compares the plurality of synchronization signal sequences generated by the synchronization signal generation unit 113 with the synchronization signal sequence extracted by the synchronization signal extraction unit 215. As a result of the comparison, the synchronization processing unit 216 specifies the synchronization signal sequence extracted by the synchronization signal extraction unit 215 from the plurality of synchronization signal sequences generated by the synchronization signal generation unit 113. That is, terminal 200 can perform synchronization processing that synchronizes in units of slots or subframes, using synchronization signal sequence by synchronization processing section 216.
  • the pilot signal generation unit 212 generates a plurality of pilot signal sequences.
  • the pilot signal generation unit 212 outputs the generated plurality of pilot signal sequences to the synchronization processing unit 216.
  • the synchronization processing unit 216 compares the plurality of pilot signal sequences generated by the pilot signal generation unit 212 with the pilot signal sequence extracted by the pilot signal extraction unit 214. As a result of the comparison, the synchronization processing unit 216 identifies the pilot signal sequence extracted by the pilot signal extraction unit 214 from the plurality of pilot signal sequences generated by the pilot signal generation unit 212. That is, terminal 200 can perform synchronization processing that is synchronized on a symbol-by-symbol basis when synchronization processing section 216 uses the pilot signal sequence.
  • terminal 200 performs the synchronization process using both the synchronization signal and the pilot, but may perform the synchronization process using one of the synchronization signal and the pilot signal.
  • Radio channel quality measuring section 205 measures the radio channel quality based on the pilot signal sequence output from pilot signal extracting section 214.
  • the radio channel quality represents at least one of reception power and reception quality.
  • the received power is, for example, reference signal received power (RSRP: Reference Signal Received Power) in LTE.
  • the reception quality is, for example, a reference signal reception quality (RSRQ) in LTE.
  • the radio channel quality measurement unit 205 outputs the measured radio channel quality to the radio channel control unit 206 as downlink radio channel quality information.
  • the radio network controller 206 performs RRC layer processing based on the control signal output from the control signal extractor 204. That is, radio resource control is performed.
  • Radio channel control section 206 outputs downlink radio channel quality information output from radio channel quality measurement section 205 to control signal generation section 207.
  • the control signal generator 207 generates a control signal based on the downlink radio channel quality information output from the radio channel controller 206. Then, the control signal generation unit 207 outputs the generated control signal to the transmission signal processing unit 209.
  • the subcarrier generation unit 211 operates by control from the wireless line control unit 206 (dotted line in FIG. 3).
  • the subcarrier generation unit 211 generates subcarriers and outputs them to the transmission signal processing unit 209.
  • the transmission signal processing unit 209 operates under the control from the wireless line control unit 206 (dotted line in FIG. 3).
  • the transmission signal processing unit 209 encodes the data signal from the host and the control signal output from the control signal generation unit 207, and modulates the encoded signal.
  • Transmission signal processing section 209 outputs the modulated signal to transmission radio section 210.
  • the configuration of transmission signal processing section 209 of terminal 200 is the same as the configuration of transmission signal processing section 109 of base station 100, detailed description thereof will be omitted.
  • the transmission radio unit 210 operates under the control from the radio line control unit 206 (dotted line in FIG. 3). Transmission radio section 210 transmits the signal output from transmission signal processing section 209 from antenna 201.
  • the system information storage unit 208 stores the system information notified to the terminal 200. System information will be described later.
  • the radio network controller 106 of the base station 100 performs scheduling.
  • the radio channel controller 106 of the base station 100 selects the terminal 200 that performs downlink data transmission based on the downlink radio channel quality information included in the control signal output from the control signal extractor 104. Also, the radio channel controller 106 of the base station 100 selects the terminal 200 that permits uplink data transmission based on the uplink radio channel quality information output from the radio channel quality measurement unit 105.
  • Scheduling methods include a Max CIR method selected from a terminal 200 having a high CIR (Carrier to Interference Ratio), and a proportional fairness method that assigns radio resources fairly to each terminal 200 based on radio channel quality. Further, as a scheduling method, there is a round robin method in which radio resources are evenly allocated to all terminals 200.
  • CIR Carrier to Interference Ratio
  • the radio network controller 106 of the base station 100 selects radio resources, modulation schemes, and coding rates to be used when transmitting data to the selected terminal 200.
  • Radio channel control section 106 outputs the selected radio resource, modulation scheme and coding rate to control signal generation section 107 as a result of scheduling.
  • the control signal generation unit 107 generates the radio resource, modulation scheme, and coding rate output from the radio channel control unit 106 as a control signal related to data transmission.
  • the control signal is notified from base station 100 to terminal 200.
  • the radio network controller 206 of the terminal 200 performs random access to the base station 100 using the system information notified in advance to the terminal 200 when the base station 100 selects a specified cell. Perform the procedure. As a result, the radio channel between the base station 100 and the terminal 200 is established by random access.
  • Random access is exemplified by contention-based random access (see TS36.300 for details) in which terminal 200 selects a random access preamble and notifies base station 100 based on system information on the premise of collision of preambles.
  • radio channel controller 206 of terminal 200 transmits a random access preamble
  • radio channel controller 106 of base station 100 receives the random access preamble transmitted from terminal 200.
  • the radio network controller 106 of the base station 100 generates a response signal for the random access preamble.
  • the radio network controller 106 of the base station 100 transmits the generated response signal to the terminal 200.
  • the radio channel between the base station 100 and the terminal 200 is established by random access.
  • random access is performed when performing handover to another frequency or another base station.
  • examples of random access include non-contention based random access (see TS36.300) in which a random access preamble to be used is given from the base station 100 to the terminal 200 in advance.
  • the radio network controller 106 of the base station 100 notifies the terminal 200 of the random access preamble in advance.
  • Radio channel controller 206 of terminal 200 transmits a random access preamble
  • radio channel controller 106 of base station 100 receives the random access preamble transmitted from terminal 200.
  • the radio network controller 106 of the base station 100 generates a response signal for the random access preamble.
  • the radio network controller 106 transmits the generated response signal to the terminal 200.
  • the radio channel between the base station 100 and the terminal 200 is established by random access.
  • the radio channel controller 106 of the base station 100 compares the first radio channel quality when connected to the terminal 200 with the second radio channel quality from other adjacent base stations. As a result of the comparison, the second radio channel quality is better than the first radio channel quality due to the degradation of the first radio channel quality. In this case, the radio network controller 106 of the base station 100 selects another base station as the HO destination base station. Subsequently, the radio network controller 106 of the base station 100 transmits a HO request to the selected base station. When receiving the dedicated preamble for the HO request from the selected base station, the radio network controller 106 of the base station 100 notifies the terminal 200 of the received dedicated preamble as HO control information.
  • the radio network controller 206 of the terminal 200 performs non-contention based random access using the dedicated preamble notified from the base station 100. Thereby, HO is implemented. That is, the base station that communicates with terminal 200 is switched from base station 100 to the selected base station.
  • FIG. 6 is a diagram illustrating an example of a system band when OFDM is used.
  • a system band is divided into a plurality of frequency bands, and radio resources are allocated to each frequency band.
  • the system band is one frequency band constituting the wireless communication system.
  • the system band is 20 MHz in LTE, for example.
  • Each frequency band is, for example, RB (Resource Brock) in LTE.
  • system information includes radio resources, subcarrier spacing, symbol length, subframe length, and the like.
  • OFDM Frequency Division Multiple Access
  • the number of subcarriers, subcarrier interval, TTI (Transmission Time Interval), and number of symbols are the same in each frequency band.
  • TTI Transmission Time Interval
  • the symbol length, slot length, subframe length, and frame length are the same. Therefore, when OFDM is used, waveform shaping (filtering) is performed on the entire system band.
  • the system information is the same within the system band.
  • terminal 200 performs synchronization processing on the base station and performs radio communication with base station 100 using the same system information notified in advance.
  • FIG. 7 is a sequence showing an example of an operation at the time of setting a wireless line when using OFDM.
  • the radio channel controller 106 of the base station 100 controls the pilot signal generator 112 and the synchronization signal generator 113 to generate a synchronization signal and a pilot signal.
  • the radio channel controller 106 of the base station 100 controls the transmission signal processor 109 and the transmission radio unit 110 to transmit the generated synchronization signal and pilot signal (step S10).
  • Radio channel control section 206 of terminal 200 controls reception radio section 202 and reception signal processing section 203 to receive the synchronization signal and pilot signal transmitted from base station 100.
  • Radio channel control section 206 of terminal 200 controls pilot signal generation section 212, synchronization signal generation section 213, pilot signal extraction section 214, synchronization signal extraction section 215, and synchronization processing section 216, and receives the received synchronization signal and pilot signal.
  • the synchronization processing may be performed at the time of cell selection, or may be performed at the time of cell reselection or handover.
  • the case of cell selection will be described.
  • the radio network controller 106 of the base station 100 notifies the terminal 200 of system information for the entire system band (step S12).
  • the system information of the entire system band is, for example, MIB (Master Information Block) or SIB (System Information Block) in 3GPP.
  • System information includes control information such as radio resources, subcarrier spacing, symbol length, subframe length, etc., cell ID, slot number, cell priority information, information for cell selection, and random access. Contains information.
  • the information included in the MIB or the SIB described in the W-CDMA specification or LTE specification defined in 3GPP may be included.
  • the radio network controller 206 of the terminal 200 receives the synchronization signal and pilot signal transmitted from each base station (step S13). At this time, radio channel control section 206 of terminal 200 controls pilot signal generation section 212, synchronization signal generation section 213, pilot signal extraction section 214, synchronization signal extraction section 215, and synchronization processing section 216, and receives the received synchronization signal. Then, synchronization processing is performed using the pilot signal.
  • the radio channel quality measurement unit 205 of the terminal 200 measures the radio channel quality based on the received pilot signal.
  • the radio channel quality represents at least one of reception power and reception quality.
  • the received power is, for example, reference signal received power (RSRP: Reference Signal Received Power) in LTE.
  • the reception quality is, for example, a reference signal reception quality (RSRQ) in LTE.
  • radio channel control unit 206 of terminal 200 selects a base station with the best radio channel quality or a cell in which the base station is defined from a plurality of base stations. A cell selection process is performed.
  • the radio channel control unit 206 of the terminal 200 selects a cell in which the base station 100 is defined based on the measured radio channel quality (step S14).
  • the radio network controller 206 of the terminal 200 performs a random access procedure on the base station 100 based on the system information notified from the base station 100 (step S15).
  • the radio channel controller 106 of the base station 100 sets a radio channel between itself and the terminal 200 by random access based on the system information (step S16).
  • the radio channel controller 106 of the base station 100 performs data transmission between itself and the terminal 200 using the radio channel between itself and the terminal 200 (step S17).
  • FIG. 8 is a diagram illustrating an example of a system band when F-OFDM is used in the wireless communication system according to the embodiment.
  • the system band is divided into a plurality of frequency bands within the same system band. Further, each frequency band is divided into a plurality of subcarrier groups (hereinafter referred to as SCG), and radio resources are allocated to each SCG.
  • SCG subcarrier groups
  • the system band is one frequency band constituting the wireless communication system.
  • SCG may also be referred to as a cluster or a subcarrier block (SCB).
  • SCB subcarrier block
  • the system information includes radio resources, subcarrier intervals, symbol lengths, subframe lengths, and the like, as in the radio communication system using OFDM.
  • FIG. 9 is a diagram illustrating an example of each SCG when F-OFDM is used in the wireless communication system according to the embodiment.
  • each SCG is composed of a plurality of subcarriers, and at least one of the number of subcarriers, subcarrier spacing, TTI, symbol length, etc. is different in each SCG.
  • each of SCG1 to SCG3 has a different subcarrier interval and TTI. Therefore, when F-OFDM is used, waveform shaping (filtering) is performed for each SCG.
  • system information differs for each SCG.
  • the subcarrier interval and symbol length of the system information are different for each SCG.
  • terminal 200 cannot perform synchronization processing on base station 100 because the synchronization timing differs for SCGs having different subcarrier intervals, symbol lengths, and the like.
  • terminal 200 cannot perform wireless communication with base station 100. Therefore, in a wireless communication system using F-OFDM, it is desirable that a terminal can perform synchronization processing for each SCG.
  • base station 100 generates a synchronization signal and a pilot signal for each SCG.
  • the base station 100 when the base station 100 generates a synchronization signal and a pilot signal for each SCG, a large number of synchronization signal sequences are required. For example, when four SCGs are assigned to one cell that defines a base station and the number of cell IDs is 504, the synchronization signal and pilot signal are 2016 series.
  • the subcarrier interval is set by giving orthogonality to the subcarriers as in the case of using OFDM, but if the number of sequences is large, the orthogonality may be deteriorated. There is. When the orthogonality is deteriorated, there is a possibility that interference between the synchronization signals becomes large. That is, interference is given to other SCGs.
  • the second subcarrier interval is set to 2 n times (n is an integer) with respect to the first subcarrier interval.
  • the symbol length decreases in inverse proportion to the subcarrier interval. That is, the second symbol length is set to 1/2 n times the first symbol length.
  • the base station 100 multiplies the first symbol length synchronization signal and pilot signal by orthogonal codes such as OVSF (Orthogonal Variable Spreading Factor).
  • OVSF Orthogonal Variable Spreading Factor
  • FIG. 10 is a diagram showing an example of the OVSF code.
  • the code used depends on the spreading factor (SF).
  • SF spreading factor
  • FIG. 11 is a diagram illustrating an example of a synchronization signal when the OVSF code is applied to LTE.
  • PSS Primary Synchronization Signal
  • the second synchronization signal d′ u (n) is generated by multiplying the first synchronization signal du (n) by an OVSF code (hereinafter, spread code).
  • SSS Secondary Synchronization Signal
  • FIG. 12 is a diagram illustrating an example of the second synchronization signal d′ u (n) in the time axis direction.
  • the second synchronization signal d′ u (n) is generated so as to have a time interval T of the first synchronization signal du (n) in the time axis direction. That is, by setting the second subcarrier interval to twice the first subcarrier interval, the second symbol length is set to 1 ⁇ 2 times the first symbol length.
  • the time interval T when the terminal 200 receives the first synchronization signal du (n) can be made the same as that for the second synchronization signal d′ u (n), the device scale of the terminal 200 is increased. It can be simplified. The same applies to the pilot signal.
  • FIG. 13 is a diagram illustrating an example of the second synchronization signal d′ u (n) in the subcarrier axis (frequency axis) direction.
  • the second synchronization signal d′ u (n) is generated so as to have the frequency bandwidth W of the first synchronization signal du (n) in the frequency axis direction. That is, by setting the second subcarrier interval to 1 ⁇ 2 times the first subcarrier interval, the second symbol length is set to twice the first symbol length.
  • the frequency bandwidth W when the terminal 200 receives the first synchronization signal du (n) can be made the same as that of the second synchronization signal d′ u (n), the device scale of the terminal 200 is increased. Can be simplified. The same applies to the pilot signal.
  • FIG. 12 shows a method of widening the subcarrier interval
  • FIG. 13 shows a method of narrowing the subcarrier interval.
  • the synchronization signal and the pilot signal are arranged in the subcarrier axis (frequency axis) direction, when synchronizing in the time axis direction, the method of widening the subcarrier interval as shown in FIG. It is effective. That is, it is more effective to shorten the second symbol length based on the first symbol length.
  • the wireless communication system includes a multiple access method (Multiple Access) for changing system information by changing the subcarrier interval and the symbol length for each SCG, such as UF (Universal-Filtered) -OFDM. These are collectively called F-OFDM.
  • Multiple Access Multiple Access
  • UF Universal-Filtered
  • FIG. 14 is a diagram illustrating an example of a terminal 200 when F-OFDM is used in the wireless communication system according to the embodiment.
  • the terminal 200 includes a reception signal processing unit 203F, a radio channel control unit 206F, and a transmission signal processing unit 209F.
  • a plurality of SCGs that is, the P-SCG 10 and the S-SCGs 11 to 14 are assigned to the radio network controller 206F.
  • the reception signal processing unit 203F, the radio line control unit 206F, and the transmission signal processing unit 209F will be described later.
  • terminal 200 has antenna 201, reception radio section 202, control signal extraction section 204, radio channel quality measurement section 205, control signal generation section 207, system information storage section 208, transmission radio section. 210 and a subcarrier generation unit 212.
  • FIG. 15 is a diagram illustrating an example of the base station 100 when F-OFDM is used in the wireless communication system according to the embodiment.
  • the base station 100 includes a reception signal processing unit 103F, a radio channel control unit 106F, a system information storage unit 108F, and a transmission signal processing unit 109F.
  • a plurality of SCGs that is, P-SCG 10 and S-SCGs 11 to 14 are assigned to the radio network controller 106F.
  • the reception signal processing unit 103F, the radio channel control unit 106F, the system information storage unit 108F, and the transmission signal processing unit 109F will be described later.
  • base station 100 has antenna 101, reception radio section 102, control signal extraction section 104, radio channel quality measurement section 105, control signal generation section 107, transmission radio section 110, subcarrier generation. Part 112.
  • FIG. 16 is a diagram illustrating an example of a system information storage unit when F-OFDM is used in the wireless communication system according to the embodiment.
  • the system information storage unit 108F of the base station 100 stores a plurality of different SCG system information in association with the type of service.
  • a plurality of SCGs are divided into P (Primary) -SCG 10 which is a first SCG and S (Secondary) -SCGs 11 to 14 which are a plurality of second SCGs.
  • the P-SCG 10 corresponds to a center frequency bandwidth of 1.4 MHz in LTE, for example, and is also called T (Temporary) -SCG.
  • T Temporal
  • one S-SCG may be provided unless otherwise noted.
  • the types of services include basic services that realize existing functions such as broadband services, low-speed transmission services that transmit sensor output at low speed, and high-speed transmission services that transmit moving pictures at high speed. It is done.
  • the types of services include low-delay services that require low delay in in-vehicle communication and high-quality low-delay services that require high reliability when performing medical treatment remotely. .
  • the system information storage unit 108F stores the system information of the P-SCG 10 in association with the basic service described above.
  • the system information storage unit 108F stores the system information of the S-SCG 11 in association with the above-described low-speed transmission service.
  • the system information storage unit 108F stores the system information of the S-SCG 12 in association with the above-described high-speed transmission service.
  • the system information storage unit 108F stores the system information of the S-SCG 13 in association with the above-described low delay service.
  • the system information storage unit 108F stores the system information of the S-SCG 14 in association with the above-described high quality low delay service.
  • FIG. 17 is a diagram illustrating an example of a received signal processing unit when F-OFDM is used in the wireless communication system according to the embodiment.
  • the reception signal processing unit 103F of the base station 100 includes an ADC 301 and a plurality of reception signal processing systems 320 to 324.
  • Each of the plurality of received signal processing systems 320 to 324 includes a CP removing unit 302, an FFT unit 303, a demodulation / decoding unit 304, and a filter 310.
  • the ADC 301, the CP removing unit 302, the FFT unit 303, and the demodulation / decoding unit 304 have the same configuration as when OFDM is used.
  • the plurality of reception signal processing systems 320 to 324 are divided into a first reception signal processing system 320 and a plurality of second reception signal processing systems 321 to 324.
  • the first received signal processing system 320 is provided corresponding to the P-SCG10.
  • the plurality of second received signal processing systems 321 to 324 are provided corresponding to the plurality of S-SCGs 11 to 14, respectively.
  • the ADC 301 converts the signal output from the reception wireless unit 102 into a digital signal. Then, the ADC 301 outputs the converted digital signal to the plurality of received signal processing systems 320 to 324.
  • Each filter 310 of the plurality of received signal processing systems 320 to 324 passes a signal in a specific frequency band with respect to the signal output from the ADC 301, and attenuates signals in other frequency bands.
  • the signal that has passed through the filter 310 is output to the CP removal unit 302.
  • the CP removing unit 302 removes the CP from the digital signal output from the ADC 301. Then, CP removing section 302 outputs the signal from which CP has been removed to FFT section 303.
  • the FFT unit 303 performs FFT on the signal output from the CP removal unit 302. As a result, the signal output from the CP removing unit 302 is converted from a time domain signal to a frequency domain signal. FFT section 303 outputs the signal subjected to the FFT to demodulation / decoding section 304.
  • the demodulation / decoding unit 304 demodulates the signal output from the FFT unit 303. Then, the demodulator / decoder 304 decodes the demodulated signal. Demodulation / decoding section 304 outputs the decoded signal.
  • reception signal processing unit 203F of the terminal 200 it is sufficient that at least one reception signal processing system is provided.
  • FIG. 18 is a diagram illustrating an example of a transmission signal processing unit when F-OFDM is used in the wireless communication system according to the embodiment.
  • the transmission signal processing unit 109F of the base station 100 includes a plurality of transmission signal processing systems 420 to 424, a synthesis unit 411, and a DAC 405.
  • Each of the plurality of transmission signal processing systems 420 to 424 includes an encoding / modulation unit 401, a subcarrier mapping unit 402, an IFFT unit 403, a CP adding unit 404, and a filter 410.
  • Encoding / modulating section 401, subcarrier mapping section 402, IFFT section 403, CP adding section 404, and DAC 405 have the same configuration as when OFDM is used.
  • the plurality of transmission signal processing systems 420 to 424 are divided into a first transmission signal processing system 420 and a plurality of second transmission signal processing systems 421 to 424.
  • the first transmission signal processing system 420 is provided corresponding to the P-SCG 10.
  • the plurality of second transmission signal processing systems 421 to 424 are provided corresponding to the plurality of S-SCGs 11 to 14, respectively.
  • Each of the encoding / modulation units 401 of the plurality of transmission signal processing systems 420 to 424 receives a data signal from the host and the control signal output from the control signal generation unit 107. Also, the encoding / modulation unit 401 receives the pilot signal sequence output from the pilot signal generation unit 112 and the synchronization signal sequence output from the synchronization signal generation unit 113.
  • the encoding / modulation unit 401 outputs the data signal from the higher level, the control signal output from the control signal generation unit 107, the pilot signal sequence output from the pilot signal generation unit 112, and the synchronization signal generation unit 113.
  • the synchronized signal sequence is encoded.
  • the encoding / modulating unit 401 modulates the encoded signal.
  • Encoding / modulating section 401 outputs the modulated signal to subcarrier mapping section 402.
  • the subcarrier mapping unit 402 receives the signal output from the encoding / modulation unit 401 and the subcarrier output from the subcarrier generation unit 111. Then, subcarrier mapping section 402 maps the modulation symbol of the signal modulated by encoding / modulating section 401 to the subcarrier. Subcarrier mapping section 402 outputs the mapped signal to IFFT section 403.
  • the IFFT unit 403 receives the signal output from the subcarrier mapping unit 402. Then, IFFT section 403 performs IFFT on the modulation symbol of the signal mapped by subcarrier mapping section 402. As a result, the symbol of the signal output from subcarrier mapping section 402 is converted from a modulation symbol in the frequency domain to an effective symbol in the time domain. IFFT section 403 outputs the signal subjected to IFFT to CP adding section 404.
  • CP adding section 404 generates an OFDM symbol by adding a CP to the signal output from IFFT section 403.
  • CP adding section 404 converts the generated OFDM symbol into a predetermined radio frequency. Then, CP adding section 404 outputs the converted signal to filter 410.
  • the filter 410 allows a signal in a specific frequency band to pass through the signal output from the CP adding unit 404 and attenuates signals in other frequency bands.
  • the signal that has passed through the filter 410 is output to the synthesis unit 411.
  • the combining unit 411 combines the signals output from the filters 410 of the plurality of transmission signal processing systems 420 to 424.
  • the synthesized signal is output to the DAC 405.
  • the DAC 405 converts the signal output from the synthesis unit 411 into an analog signal. Then, the DAC 405 outputs the converted analog signal to the transmission radio unit 102.
  • the transmission signal processing unit 209F of the terminal 200 it is sufficient that at least one transmission signal processing system is provided.
  • FIG. 19 is a diagram illustrating an example of a radio channel controller when F-OFDM is used in the radio communication system according to the embodiment.
  • the radio network controller 106F of the base station 100 has a plurality of controllers.
  • the plurality of control units are provided for a plurality of SCGs assigned to each frequency band in the system band.
  • the first control unit among the plurality of control units is referred to as a P (Primary) -SCG control unit 610
  • the second control unit is referred to as an S (Secondary) -SCG control unit 620.
  • the S-SCG control unit 620 includes S-SCG control units 611 to 614.
  • the P-SCG control unit 610 is provided for the P-SCG 10 used for basic services.
  • the S-SCG control unit 611 is provided for the S-SCG 11 used for the low-speed transmission service.
  • the S-SCG control unit 612 is provided for the S-SCG 12 used for the high-speed transmission service.
  • the S-SCG control unit 613 is provided for the S-SCG 13 used for the low delay service.
  • the S-SCG control unit 614 is provided for the S-SCG 14 used for the high quality and low delay service.
  • FIG. 20 is a sequence illustrating an example of SCG addition processing as the operation of the wireless communication system according to the embodiment.
  • the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 controls the pilot signal generation unit 112 and the synchronization signal generation unit 113 so that the first synchronization signal and the first pilot signal in the P-SCG 10 are obtained. Generate.
  • the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 controls the transmission signal processing unit 109F and the transmission radio unit 110 to transmit the generated first synchronization signal and first pilot signal ( Step S100).
  • the radio channel control unit 206F of the terminal 200 controls the reception radio unit 202 and the reception signal processing unit 203F to receive the first synchronization signal and the first pilot signal transmitted from the base station 100.
  • Radio channel controller 206F of terminal 200 controls pilot signal generator 212, synchronization signal generator 213, pilot signal extractor 214, synchronization signal extractor 215, and synchronization processor 216 to receive the received first synchronization signal.
  • synchronization processing is performed using the first pilot signal (step S101).
  • the synchronization processing may be performed at the time of cell selection, or may be performed at the time of cell reselection or handover.
  • the case of cell selection will be described.
  • the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 notifies the terminal 200 of the system information of the P-SCG 10 (step S102).
  • the system information of the P-SCG 10 is, for example, a 3GPP MIB (Master Information Block), SIB (System Information Block), or the like.
  • System information includes control information such as radio resources, subcarrier spacing, symbol length, subframe length, etc., cell ID, slot number, cell priority information, information for cell selection, and random access. Contains information.
  • Radio channel control section 206F of terminal 200 controls reception radio section 202 and reception signal processing section 203F to receive the first synchronization signal and the first pilot signal transmitted from each base station (step S103). .
  • the radio channel controller 206F of the terminal 200 controls the pilot signal generator 212, the synchronization signal generator 213, the pilot signal extractor 214, the synchronization signal extractor 215, and the synchronization processor 216 to receive the received first
  • the synchronization processing is performed using the synchronization signal and the first pilot signal.
  • the radio channel quality measurement unit 205 of the terminal 200 measures the radio channel quality based on the received first pilot signal.
  • the radio channel quality represents at least one of reception power and reception quality.
  • the received power is, for example, reference signal received power (RSRP: Reference Signal Received Power) in LTE.
  • the reception quality is, for example, a reference signal reception quality (RSRQ) in LTE.
  • radio channel controller 206F of terminal 200 selects a base station with the best radio channel quality or a cell in which the base station is defined from a plurality of base stations. A cell selection process is performed.
  • the radio channel controller 206F of the terminal 200 selects a cell in which the base station 100 is defined based on the measured radio channel quality (step S104).
  • the radio network controller 206F of the terminal 200 performs a random access procedure on the base station 100 based on the system information of the P-SCG 10 notified from the base station 100 (step S105).
  • the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 sets a radio channel between the P-SCG control unit 610 and the terminal 200 by random access based on the system information of the P-SCG 10 ( Step S106).
  • the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 performs an optimal S-SCG based on the communication quality when the radio channel between the P-SCG control unit 610 and the terminal 200 is established.
  • the SCG selection process to select is performed (step S107). For example, in the SCG selection process, the S-SCG 14 is selected as the optimum S-SCG from the S-SCGs 11 to 14.
  • Examples of the communication quality include radio channel quality, CQI (Channel Quality Indicator), and QoS (Quality of Service).
  • QoS is set by the terminal 200.
  • the first symbol length included in the system information of P-SCG 10 and the second symbol length included in the system information of S-SCG 14 are different from each other. That is, by setting the second subcarrier interval to 2 n times the first subcarrier interval, the second symbol length is set to 1/2 n times the first symbol length. ing. Therefore, when the optimal S-SCG 14 is selected, the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 sends a system information transmission request for requesting transmission of system information of the S-SCG 14 to S. -It outputs to the SCG control part 614 (step S108).
  • the S-SCG control unit 614 of the radio channel control unit 106F of the base station 100 sends the system information of the S-SCG 14 to the P-SCG control unit 610. Output (step S109).
  • the system information of the S-SCG 14 is, for example, SIB in 3GPP.
  • the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 notifies the terminal 200 of the system information of the S-SCG 14 output from the S-SCG control unit 614 (step S110).
  • the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 controls the pilot signal generation unit 112 and the synchronization signal generation unit 113, so that the second synchronization signal and the second pilot in the S-SCG 14 are obtained. Generate a signal. For example, the P-SCG control unit 610 multiplies the first synchronization signal and the first pilot signal by an orthogonal code such as OVSF. Thereby, P-SCG control section 610 allows the second synchronization signal and the second synchronization signal obtained by spreading the first synchronization signal and the first pilot signal in the frequency axis direction so that the symbol length becomes 1/2 n times. A pilot signal is generated.
  • the first synchronization signal and the first pilot signal are subjected to signal processing (spreading processing) so that the symbol length becomes the second symbol length.
  • P-SCG control section 610 controls transmission signal processing section 109F and transmission radio section 110 to transmit the generated second synchronization signal and second pilot signal (step S111).
  • the radio channel controller 206F of the terminal 200 receives the second synchronization signal and the second pilot signal transmitted from the base station 100. At this time, the radio channel controller 206F of the terminal 200 controls the pilot signal generator 212, the synchronization signal generator 213, the pilot signal extractor 214, the synchronization signal extractor 215, and the synchronization processor 216 to receive the received second
  • the synchronization process is performed using the synchronization signal and the second pilot signal (step S112).
  • the radio network controller 206F uses the same frequency bandwidth as that of the P-SCG 10 (T-SCG) in the S-SCG 14 having different subcarrier intervals and symbol lengths, Synchronization processing can be performed using the pilot signal.
  • the radio channel controller 206F of the terminal 200 After performing the synchronization processing, the radio channel controller 206F of the terminal 200 performs a random access procedure on the base station 100 based on the system information of the S-SCG 14 notified from the base station 100 (step S113).
  • the S-SCG control unit 614 of the radio channel control unit 106F of the base station 100 sets a radio channel between the S-SCG control unit 614 and the terminal 200 by random access based on the system information of the S-SCG 14 ( Step S114).
  • the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 uses a radio channel between the P-SCG control unit 610 and the terminal 200 to connect between the P-SCG control unit 610 and the terminal 200.
  • Data transmission is performed (step S115).
  • the S-SCG control unit 614 of the radio channel control unit 106F of the base station 100 uses a radio channel between the S-SCG control unit 614 and the terminal 200 to connect between the S-SCG control unit 614 and the terminal 200.
  • Data transmission is performed (step S116).
  • FIG. 21 is a sequence illustrating an example of the SCG change process as the operation of the wireless communication system according to the embodiment.
  • the same steps S100 to S114 as in FIG. 20 are performed.
  • a wireless line is set between the S-SCG control unit 614 and the terminal 200.
  • the S-SCG control unit 614 of the radio channel control unit 106F of the base station 100 uses the radio channel between the S-SCG control unit 614 and the terminal 200, and Data transmission is performed between them (step S120).
  • the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 cancels the setting of the radio channel between the P-SCG control unit 610 and the terminal 200 (step S121).
  • the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 sends the system information of the P-SCG 10 to the terminal 200 when a situation occurs in which the system information of the P-SCG 10 is notified from the base station 100 to the terminal 200. (Step S122).
  • FIG. 22 is a flowchart illustrating an example of the SCG selection process as the operation of the wireless communication system according to the embodiment.
  • the S-SCGs 11 to 14 are the first to fourth S-SCGs. Also, the first to fourth S-SCGs are designated as S-SCGs 1 to 4, respectively. Therefore, in FIG. 23, the k-th S-SCG is S-SCGk. Let m be 4.
  • step S107 the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 selects S-SCGk by setting k to 1 (step S130).
  • the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 measures traffic volume, transmission rate, transmission delay, etc. when a radio channel is established between the P-SCG control unit 610 and the terminal 200. To do. At this time, P-SCG control section 610 calculates communication conditions in S-SCGk based on the measured traffic volume, transmission rate, transmission delay, and S-SCGk configuration (subcarrier interval and symbol length). (Step S131).
  • the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 determines whether or not the calculated communication condition satisfies the required communication condition in S-SCGk (step S132).
  • the traffic volume, transmission speed, transmission delay, and the like required for the above-described communication service are collectively referred to as required communication conditions.
  • the required communication conditions are different in each S-SCG.
  • the calculated communication condition does not satisfy the required communication condition in S-SCGk.
  • the calculated transmission rate is equal to or lower than the required transmission rate in S-SCGk, the calculated communication condition does not satisfy the required communication condition in S-SCGk.
  • the calculated transmission delay exceeds the reference transmission delay in S-SCGk, the calculated communication condition does not satisfy the required communication condition in S-SCGk.
  • the calculated communication condition satisfies the required communication condition in S-SCGk. If the calculated transmission rate is not less than or equal to the required transmission rate in S-SCGk, or if the calculated transmission delay does not exceed the reference transmission delay in S-SCGk, the calculated communication condition is the required communication in S-SCGk. The condition is met.
  • step S132 when the calculated communication condition satisfies the required communication condition in S-SCGk (step S132: YES), the P-SCG control unit 610 of the radio line control unit 106F of the base station 100 Let SCGk be the optimal S-SCG. That is, in the SCG selection process (step S107), S-SCGk is selected as the optimum S-SCG (step S133).
  • step S132 when the calculated communication condition does not satisfy the required communication condition in S-SCGk (step S132: NO), the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 sets k to 1 is incremented (step S134). At this time, the P-SCG control unit 610 determines whether k is m + 1 (step S135).
  • step S135 the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 performs step S131. That is, for the next S-SCGk, the processes after step S131 are performed.
  • step S135 the P-SCG control unit 610 of the radio channel control unit 106F of the base station 100 determines that the radio channel between the P-SCG control unit 610 and the terminal 200 Communication is performed by Alternatively, the communication conditions are changed and the processes after step S130 are performed. Alternatively, a handover (HO) is requested to an SCG configured by another base station.
  • HO handover
  • the radio communication system includes the base station 100 and the terminal 200 that communicate using one system band.
  • the base station 100 includes a wireless line control unit 106F.
  • Radio channel control section 106F allocates first and second subcarrier groups (P-SCG10, S-SCG11 to 14) having different first and second symbol lengths of system information within the system band.
  • the radio network controller 106F includes a first controller (P-SCG controller 610) and a second controller (S-SCG controller 620).
  • P-SCG control section 610 transmits a first signal for terminal 200 to synchronize to terminal 200 in the first subcarrier group (P-SCG10).
  • S-SCG control section 620 (in this case, S-SCG control section 614) provides terminal 200 with a second signal for terminal 200 to synchronize in the second subcarrier group (in this case, S-SCG14).
  • the second signal is a signal obtained by performing signal processing on the first signal so that the symbol length becomes the second symbol length.
  • the terminal 200 includes a control unit (wireless line control unit 206F).
  • Radio link control unit 206F synchronizes using the first signal transmitted from base station 100 in P-SCG10.
  • the radio network controller 206F synchronizes using the second signal transmitted from the base station 100 in the S-SCG 14.
  • the subcarrier interval is set to 2 n times (n is an integer) with respect to S-SCG.
  • the base station 100 multiplies the basic first signal (the first synchronization signal and the first pilot signal) by an orthogonal code (spreading code) such as OVSF.
  • the base station 100 spreads the first signal (the first synchronization signal and the first pilot signal) in the frequency axis direction so that the symbol length becomes 1/2 n times (the second signal (the first synchronization signal)). 2 synchronization signals and second pilot signal).
  • Base station 100 then transmits the second signal (second synchronization signal and second pilot signal) to terminal 200.
  • terminal 200 can receive the received second synchronization signal and second pilot signal with the same frequency bandwidth as P-SCG10 (T-SCG) even in S-SCGs having different subcarrier intervals and symbol lengths. Can be used for synchronization processing.
  • the number of signal sequences can be based on the number of cells (or cell IDs) rather than the number of SCGs. For example, when four SCGs are assigned to one cell that defines a base station and the number of cell IDs is 504, the synchronization signal and the pilot signal do not need to be 2016 sequences, and may be 504 sequences.
  • each component in the embodiment does not necessarily need to be physically configured as illustrated.
  • the specific form of distribution / integration of each part is not limited to the one shown in the figure, and all or a part thereof may be functionally or physically distributed / integrated in arbitrary units according to various loads and usage conditions. Can be configured.
  • each device is executed entirely or arbitrarily on a CPU (Central Processing Unit) (or a micro computer such as MPU (Micro Processing Unit) or MCU (Micro Controller Unit)). You may make it do.
  • Various processes may be executed in whole or in any part on a program that is analyzed and executed by a CPU (or a microcomputer such as an MPU or MCU) or hardware based on wired logic.
  • the base station 100 and the terminal 200 of the embodiment can be realized by the following hardware configuration, for example.
  • FIG. 23 is a diagram illustrating an example of a hardware configuration of the base station 100.
  • the base station 100 includes a processor 1001, a memory 1002, an RF (Radio Frequency) unit 1003, an antenna 1004, and a network interface (IF) 1005.
  • the processor 1001 include a CPU, a DSP (Digital Signal Processor), and an FPGA (Field Programmable Gate Array).
  • the memory 1002 include a RAM (Random Access Memory) such as SDRAM (Synchronous Dynamic Random Access Memory), a ROM (Read Only Memory), a flash memory, and the like.
  • the various processes performed in the base station 100 may be realized by the processor 1001 executing programs stored in various memories such as a nonvolatile storage medium. That is, a program corresponding to each process executed by each configuration may be recorded in the memory 1002, and each program may be executed by the processor 1001.
  • each configuration includes reception signal processing unit 103F, control signal extraction unit 104, radio channel quality measurement unit 105, radio channel control unit 106F, control signal generation unit 107, transmission signal processing unit 109F, and pilot signal generation unit 112. This corresponds to the synchronization signal generation unit 113.
  • the system information storage unit 108F is realized by the memory 1002.
  • the reception radio unit 102, the transmission radio unit 110, and the subcarrier generation unit 111 are realized by the RF unit 1003.
  • the antenna 101 is realized by the antenna 1004.
  • FIG. 24 is a diagram illustrating an example of a hardware configuration of the terminal 200.
  • the terminal 200 includes a processor 2001, a memory 2002, an RF unit 2003, and an antenna 2004.
  • Examples of the processor 2001 include a CPU, a DSP, and an FPGA.
  • Examples of the memory 2002 include RAM such as SDRAM, ROM, flash memory, and the like.
  • the various processes performed by the terminal 200 may be realized by the processor 2001 executing programs stored in various memories such as a nonvolatile storage medium. That is, a program corresponding to each process executed by each configuration may be recorded in the memory 2002, and each program may be executed by the processor 2001.
  • each configuration corresponds to the reception signal processing unit 203F, the control signal extraction unit 204, the radio channel quality measurement unit 205, the radio channel control unit 206F, the control signal generation unit 207, and the transmission signal processing unit 209F.
  • Each component corresponds to the pilot signal generation unit 212, the synchronization signal generation unit 213, the pilot signal extraction unit 214, the synchronization signal extraction unit 215, and the synchronization processing unit 216.
  • the system information storage unit 208 is realized by the memory 2002.
  • the reception radio unit 202, the transmission radio unit 210, and the subcarrier generation unit 211 are realized by the RF unit 2003.
  • the antenna 201 is realized by the antenna 2004.

Landscapes

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

Abstract

L'invention concerne un système de communication radio comportant une station de base et un terminal qui utilisent une seule bande de système pour réaliser des communications. La station de base comporte une unité de commande de canal radio, une première unité de commande et une deuxième unité de commande. L'unité de commande de canal radio attribue, dans la bande de système, des premier et deuxième groupes de sous-porteuses (dénotés ci-après par SCG) caractérisés par des première et deuxième longueurs de symbole différentes dans des informations de système. La première unité de commande envoie au terminal, dans le premier SCG, un premier signal servant à la synchronisation du terminal. La deuxième unité de commande émet dans le deuxième SCG un deuxième signal obtenu par un traitement de signal appliqué au premier signal de telle façon que la longueur de symbole devienne la deuxième longueur de symbole.
PCT/JP2017/000508 2017-01-10 2017-01-10 Station de base, terminal, système de communication radio et procédé de communication radio WO2018131078A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11196062A (ja) * 1997-12-26 1999-07-21 Jisedai Digital Television Hoso System Kenkyusho Ｏｆｄｍ受信装置
JP2004349889A (ja) * 2003-05-20 2004-12-09 Intelligent Cosmos Research Institute 送信装置および通信システム
WO2016068072A1 (fr) * 2014-10-31 2016-05-06 三菱電機株式会社 Système de communications
JP2016134854A (ja) * 2015-01-21 2016-07-25 株式会社国際電気通信基礎技術研究所 無線通信装置および無線通信システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11196062A (ja) * 1997-12-26 1999-07-21 Jisedai Digital Television Hoso System Kenkyusho Ｏｆｄｍ受信装置
JP2004349889A (ja) * 2003-05-20 2004-12-09 Intelligent Cosmos Research Institute 送信装置および通信システム
WO2016068072A1 (fr) * 2014-10-31 2016-05-06 三菱電機株式会社 Système de communications
JP2016134854A (ja) * 2015-01-21 2016-07-25 株式会社国際電気通信基礎技術研究所 無線通信装置および無線通信システム

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