WO2005122263A1 - 基地局および受信方法 - Google Patents
基地局および受信方法 Download PDFInfo
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- WO2005122263A1 WO2005122263A1 PCT/JP2004/008644 JP2004008644W WO2005122263A1 WO 2005122263 A1 WO2005122263 A1 WO 2005122263A1 JP 2004008644 W JP2004008644 W JP 2004008644W WO 2005122263 A1 WO2005122263 A1 WO 2005122263A1
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- cqi
- signals
- signal
- base station
- terminal
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1887—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
- H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information
Definitions
- the present invention relates to a base station constituting a communication system for performing bucket data transmission, and more particularly, to an ACK (Acknowledgement) / NACK (Non-Acknowledge).
- Base station that determines the data transmission schedule and reception of CQI signals by the base station
- the standard for high-speed downlink wireless communication (HSDPA: High Speed Downlink Packet Access) is defined as 3.5-ififi mobile communication. 0 0
- a base station is connected to N terminals and transmits packet data to each terminal. At this time, it is used for transmission of HS-D SCH (High Speed Downlink Shared Channel) and bucket data common to all terminals.
- HS-D SCH High Speed Downlink Shared Channel
- bucket data common to all terminals.
- a retransmission request to the base station and notification of communication quality information from the terminal to the base station are dedicated uplink channels individually allocated to each terminal.
- HS—DP CCH High Speed Dedicated Physical Control Channel
- A DPCH (Dedicated Physical Channel) is defined, and transmission power control commands and the like are transmitted by this channel.
- the HS-DPCCH communicates the HARQ-AC for notifying the necessity of retransmission with the ACKZNA CK signal and the communication quality. It consists of CQ I and In HARQ-ACK, the same signal is repeatedly transmitted multiple times (10 bits) in order to improve reliability, and in CQ I, data reliability is improved by performing re-correction coding. ing. Such a unit of one cycle of HARQ-ACK and CQI is called a subframe.
- the base station generates, for example, a despreading code corresponding to the 1 ⁇ 3_0 bit 1 signal sent from: ⁇ terminals, and extracts and demodulates the HS-DPCCH signal from each terminal individually. Further, the demodulated signal is decoded. Then, the scheduler in the base station determines the transmission schedule of the downlink bucket data according to 1-13-03 ⁇ 1 ⁇ based on the received HS-DPCCH signal (IARQ-ACK, CQI). '
- the notification timing of the CQI signal is defined by the following non-patent document 2 and the following non-patent document 1 as shown in the following equation (1).
- k is defined as “Channel Quality Indicator (CQI) feedback cycle k” and is a semi-fixed parameter.
- the CFN Connection Frame Number
- m takes a value satisfying the following conditional expression.
- the CQI notification timing may be concentrated depending on the CFN timing of each terminal.
- CQI notification may be sent from all connected terminals at the same time.
- the base station needs to receive them simultaneously, for example, when contacting with N terminals, N demodulation circuits and decoding circuits corresponding to each HS-DPCCH Is required, which leads to an increase in the hardware size of the base station.
- the present invention has been made in view of the above, and an object of the present invention is to provide a base station capable of realizing a reduction in hardware scale as compared with the related art. Disclosure of the invention
- the base station is a base station that performs packet scheduling based on ACK (Acknowledgement) / NACK (non-Acknowledgement) and CQI (Channel Quality Indicator).
- N (an integer greater than N) CQ I signals are selected from among the C Q I signals included in the M received signals sent simultaneously from (integer 2 or more) terminals and selected.
- Receiving processing control means for controlling the demodulation and decoding of the N CQI signals, demodulation means for demodulating the selected N CQI signals, and N demodulation means output by the demodulation means.
- Decoding means for decoding the demodulated signal; scheduler means for scheduling bucket data to be transmitted to each terminal based on the CQI value obtained as a decoding result; and all CQIs obtained as a result of the decoding.
- CQ I value storage means for storing the value When scheduling the bucket data destined for the terminal that transmitted the unselected CQI signal, the scheduler reads the previous CQI value corresponding to the terminal from the CQI value storage and performs the scheduling. It is characterized by the following. According to the present invention, N CQI signals selected from M CQI signals simultaneously transmitted from a plurality of terminals are received, and the result is supplied to the scheduler. For the CQI signals sent from the remaining MN terminals, the CQI values previously received from those terminals are read from the CQI value storage means, and the results are supplied to the scheduler.
- FIG. 1 is a diagram showing a configuration of a base station according to a first embodiment of the present invention
- FIG. 2 is a diagram for explaining a method of selecting a CQI signal to be demodulated
- FIG. FIG. 4 is a diagram illustrating a configuration of a base station according to a second embodiment of the present invention
- FIG. 4 is a flowchart of a third embodiment illustrating a method of determining a reception priority of a CQI signal
- FIG. FIG. 6 is a diagram showing the concept of Embodiment 4
- FIG. 6 is a flowchart of Embodiment 4 showing a method of determining the reception priority of CQI signals
- FIG. 7 is a diagram of Embodiment 5;
- FIG. 8 is a flowchart of a fifth embodiment showing a method of determining a reception priority of a CQI signal
- FIG. 9 is a flowchart of a base station according to the present invention.
- FIG. 10 is a diagram showing a configuration of Embodiment 6
- FIG. 10 is a flowchart of Embodiment 6 showing a method of determining the reception priority of CQI signals
- FIG. 11 is a diagram showing a configuration of a base station according to a seventh embodiment of the present invention
- FIG. 12 is an embodiment showing a method of determining a reception priority of a CQI signal.
- FIG. 13 is a flowchart of Embodiment 7
- FIG. 13 is a diagram showing the concept of Embodiment 8
- FIG. 14 is a flowchart of Embodiment 8 showing a method of determining the reception priority of CQI signals.
- FIG. 15 is a diagram showing a configuration of a ninth embodiment of a base station according to the present invention.
- FIG. 16 is a diagram showing a ninth embodiment showing a method of determining the reception priority of CQI signals.
- FIG. 17 is a diagram showing the concept of Embodiment 10; and
- FIG. 18 is a diagram showing the configuration of Embodiment 10 of the base station according to the present invention.
- FIG. 19 is a diagram showing a configuration of Embodiment 11 of the base station according to the present invention.
- FIG. 20 is a diagram showing the configuration of the base station according to the present invention.
- FIG. 21 is a diagram showing a configuration of Embodiment 12;
- FIG. 21 is a diagram showing an embodiment of a base station according to the present invention;
- FIG. 22 is a diagram showing the configuration of Embodiment 13,
- FIG. 22 is a diagram showing the configuration of Embodiment 14 of the base station according to the present invention, and
- FIG. 23 is a diagram showing the concept of Embodiment 15;
- FIG. 24 is a diagram showing a configuration of a base station according to a sixteenth embodiment of the present invention, and
- FIG. 25 is a diagram showing a configuration of a base station according to a seventeenth embodiment of the present invention.
- FIG. 1 is a diagram showing a configuration of a base station according to a first embodiment of the present invention, in which a reception processing control unit 1 and despreading code generation units 2_1, 2-2,..., 2-N , HS—D PCC H demodulation processing unit 3-1, 3-2, ⁇ ⁇ ⁇ , 3—N, and I-IS—DPCC H decoding processing unit 4-1, 4–2, ⁇ , 4— N, a scheduler 5, a memory 6, and a bucket queue 7.
- the operation of the base station configured as described above will be described.
- the number of HS-DPCCH demodulation processing units 3-1 to 3-N and HS-DPCCH decoding processing units 4-1 to 4-1N If the number N is exceeded (M> N), the reception processing control unit 1 performs control to switch the code generated by the despreading code generation units 2-1 to 2-N for each subframe.
- the HS—DPCC H demodulation processing sections 3-1 to 3-N can transmit N CQ I signals selected from the CQ I signals included in the M received signals transmitted simultaneously from a plurality of terminals. The signal will be demodulated.
- the demodulated signal is sent to the HS-DPCCH decoding processor 41 :! 4 to N, and the decoded signal (CQ I value) is supplied to the scheduler 5.
- the scheduler 5 schedules bucket data to each terminal stored in the packet queue 7 based on the obtained CQI value (transmission schedule using HS-DSCH). Jewling). Further, the scheduler 5 writes the CQI value received in the above processing into the memory 6. Note that the CQI signals sent from the M_N terminals (terminals that transmitted the CQI signals not selected above) were not received in the above processing, so the scheduler 5 used to The received CQI value is read from the memory 6, and packet data scheduling for each terminal is performed based on the CQI value.
- FIG. 2 is a diagram for explaining a method of selecting a CQI signal to be demodulated.
- a method of selecting a CQI signal to be demodulated for example, a round-robin method is used.
- the number N of HS-DPCCH demodulation processing units and the number of HS-DPCC H decoding processing units are set to 3
- the number of connected terminals M is set to 4
- M and N are not limited to these.
- the CQI transmission timing of some terminals may not be simultaneous.
- the base station transmits the CQI signals transmitted by terminals # 1, # 3, and # 4 in subframe #i to HS—DPCCH demodulation processing units 3-1 to 3_3 and HS—DPCCH Decryption processing unit 4: Receives using! To 4-3, and notifies the scheduler 5 of the result.
- T is not received for the CQ I signal transmitted from terminal # 2, and is received from terminal # 2 in subframe # i-1k '(k' is expressed by equation (1) in the prior art). Use the received CQ I value.
- the base station converts the CQ I signal transmitted by terminals # 1, # 2, # 4 to HS—DPCCH demodulation processing unit 3 —;! 3 and HS—Use the DPCCH decoding processing unit 4-1 to 4-3 for reception, and report the result to the scheduler 5.
- the CQI signal transmitted from terminal # 3 is not received, and the CQI value received from terminal # 3 in subframe #i is used.
- the number of connected terminals increases, and the number M of CQI signals to be received at the same time increases with the HS-DPCC H demodulation processing unit and the HS-DPCCH decoding. If the number of processing units exceeds N (M> N), N CQI signals selected from M CQI signals transmitted from multiple terminals are received and the result is supplied to the scheduler It was decided to. For the CQI signals sent from the remaining MN terminals, the CQI values previously received from those terminals were read from memory and the results were supplied to the scheduler.
- the number of HS-DPCCH demodulation processing units and HS-DPCCH decoding processing units can be reduced, that is, even if the number of CQI signals to be received simultaneously increases, each processing unit can exceed the specified number. Therefore, it is possible to avoid an increase in the circuit scale, and to achieve a reduction in the size and power consumption of the base station.
- the round-robin Although switching control of CQI signals to be received is performed according to the method, switching control may be performed before the number of CQI signals to be received simultaneously exceeds the number of processing units. As a result, the switching can be performed smoothly.
- the switching control may be performed by comparing the number of connected terminals with the number of processing units. In this case, the switching can be controlled without considering the CQI reception timing from each terminal, so that the processing can be simplified.
- the above-described switching control is applied to the number of CQI signals, but it is similarly applicable to HARQ-ACK signals. This makes it possible to reduce the number of demodulation circuits (not shown) for ACK / NACK.
- Embodiment 1 a round-robin method is used as a method of selecting a CQI signal to be demodulated.
- demodulation is performed by prioritizing CQI signals. Select the CQI signal.
- FIG. 3 is a diagram showing a configuration of a base station according to a second embodiment of the present invention, which includes a reception processing control unit 1a, a scheduler 5a, and a priority determination unit 11a.
- the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof will be omitted. Here, only the processing different from the first embodiment will be described.
- the determination unit 1 la uses the scheduling information obtained by the scheduler 5 a to determine the reception priority of the CQI signal that reflects the radio communication quality in communication with each terminal.
- the reception processing control section la based on the priority order, generates a despreading code generation section 2— :! ⁇ 2—Switch the code that generates N. That is, the reception processing control unit 1a selects N signals from the CQ I signals included in the M received signals transmitted simultaneously from a plurality of terminals in descending order of priority, and further selects the selected CQ signals.
- the demodulated signal is decoded by the HS-DPCCH decoding processing units 4_1 to 4-1N, and the result (CQI value) is supplied to the scheduler 5a.
- the scheduler 5a schedules packet data to each terminal stored in the bucket queue 7 (transmission scheduling by HS-DSCI-I) based on the obtained CQI value. Then, the scheduler 5a writes the CQI value received in the above processing to the memory 6. Since the CQ I signals sent from M ⁇ N terminals are not received in the above processing, the scheduler 5a reads out the CQ I values previously received from those terminals from the memory 6, Based on the CQI value, bucket data is scheduled to each terminal.
- the reception priority of CQI signals is determined based on the radio communication quality in communication with each terminal, and the CQI signals to be received are determined based on this priority information. I do.
- the number of processing circuits can be reduced while minimizing the effect on throughput, thereby reducing the circuit size of the base station. As a result, miniaturization and power saving of the base station can be realized! ).
- a third embodiment describes a method for determining a CQI signal reception priority based on wireless communication quality in communication with each terminal.
- the configuration of the base station is the same as that in FIG. 3 of Embodiment 2 described above.
- FIG. 4 is a flowchart of Embodiment 3 showing a method for determining the reception priority order ⁇ : of CQI signals.
- the priority determination unit 11a raises the reception priority of the CQI signal transmitted from the terminal being scheduled to perform downlink bucket transmission in the power subframe. Perform processing. This processing will be described in detail with reference to FIG.
- step S4 if terminal # 1 is a terminal scheduled to transmit a bucket in the next subframe (step S4, Yes), the priority river page position determination unit 11a sends the terminal # The priority P ri (i) of the CQI signal transmitted by 1 is incremented (step S5).
- step S5 terminal # 1 If the terminal is not scheduled to perform packet transmission in the next subframe, and the terminal is (step S4, No), it holds the current Pri (i).
- the reception priority of the CQI signal is determined based on the radio communication quality, and the CQI signal to be received is determined based on this priority information. This can reduce the number of processing circuits while minimizing the effect on throughput.
- the configuration of the base station is the same as that of FIG. 3 of the second embodiment.
- control is performed to increase the reception priority of CQI signals sent from terminals that are scheduled to perform downlink packet transmission in the next subframe. For example, as shown in FIG. 5, a terminal that transmitted a HARQ-ACK signal and a CQ I signal in the same subframe Control to increase the reception priority of CQ I signal from
- FIG. 6 is a flowchart of Embodiment 4 showing a method for determining the reception priority of CQI signals. Here, only the processing different from the above-described third embodiment will be described.
- the priority determination unit 11a the number M of CQI signals to be received at the same time, the HS-DP CCH demodulation processing units 3-1 to 3-N and the HS-DP CCH decoding processing units 4 1 to 1-4
- the number N of N is compared with N, and if M> N (Step S2, Yes, Step S3), it is checked whether HARQ-ACK has been received from terminal #i in the same subframe. (Step S11).
- step S11 if HARQ-ACK is received from terminal #i in the same subframe (step S11, Yes), priority determination section 11a transmits the CQI transmitted by the corresponding terminal.
- the signal priority order Pri (i) is incremented (step S5).
- step S11 if HARQ-ACK has not been received from terminal # 1 in the same subframe (step S11, No), the current Pi-i (i) is retained. I do.
- the HARQ-ACK signal when transmitting a retransmission packet, transmission power, transmission speed, and the like are determined based on the latest wireless communication quality. By this means, it is possible to improve the reception accuracy at the terminal at the time of retransmission.
- the received HARQ-ACK signal is an ACK
- the transmission power and transmission rate can be determined based on the latest wireless communication quality when transmitting a new bucket. By this means, it is possible to improve the reception accuracy at the terminal when transmitting a new bucket.
- control is performed so as to increase the reception priority of the CQI signal from the terminal that transmitted the HARQ-ACK signal and the CQI signal in the same subframe.
- the present invention is not limited to this. — If it is the ACK signal reception timing, it is possible to raise the priority of receiving the CQI signal from the corresponding terminal regardless of the HARQ ACK signal reception. This allows downlink bucket transmission Even if the terminal does not reach the terminal and does not respond, or if the terminal receives the downlink bucket and responds to the HARQ-ACK signal but does not reach the base station, The reception priority of the CQ I signal can be raised. In such cases, it is considered that the wireless communication quality is fluctuating, and it is particularly important to increase the priority of receiving CQI signals from the terminal.
- the configuration of the base station is the same as that in FIG. 3 of the second embodiment.
- n is an arbitrary integer of 1 or more.
- FIG. 8 is a flowchart of Embodiment 5 showing a method of determining the reception priority of CQI signals. Here, only the processing different from the above-described third or fourth embodiment will be described.
- the priority determination unit 11a the number M of CQ I signals to be received simultaneously and the HS-DPCC H demodulation processing unit 3— ;! 3 to N— and HS—DPCC H decoding processing unit 4 1 to 4—1
- the number of N is compared with N. If M> N (step S2, Yes, step S3), the previous CQ It is checked whether or not NACK has been received from terminal #i at least n times since reception of I (step S21).
- Step S21 if NACK has been received 11 times or more (Step S21, Yes), the priority concealment judging unit 11a transmits the priority order P ri (i ) Is incremented (step S5).
- step S21 if NACK has not been received ri times or more (step S21, No), the current Pri (i) is held.
- the reception priority of the CQI signal sent from that terminal is not limited to this.
- the CQ I signal sent from the terminal May be controlled so as to lower the reception priority.
- FIG. 9 is a diagram showing a configuration of a base station according to a sixth embodiment of the present invention.
- the priority determining unit 11a obtains the CQI value from the scheduler 5a, but in FIG. 9, the priority determining unit 11b obtains the CQI value from the memory 6.
- the same components as those in FIG. 1 or FIG. 3 described above are denoted by the same reference numerals and description thereof is omitted.
- control is performed such that the history of CQI signals sent from each terminal is left and the reception priority of CQI signals sent from terminals with large fluctuations in CQI values is increased. .
- FIG. 10 is a flowchart of Embodiment 6 showing a method of determining the reception priority of CQI signals. Here, only processing different from the above-described third, fourth, or fifth embodiment will be described.
- the priority determination unit 11b the number M of CQI signals to be received simultaneously and the HS-DPCCH demodulation processing unit 3-:! ⁇ 3-N and the HS-DPCCH decoding processing unit 4-1-4-1N Is compared with N, and if M> N (steps S2, Yes, step S3), the CQ I value (CQ I (i, — Calculate the difference between 1)) and the CQ I value (CQ I (i, -2)) of the reception two times before, and assign the calculation result to the priority order P ri (i) (step S31).
- the terminal preferentially receives the CQI signal transmitted by the terminal determined to have a large difference between the CQI value of the last reception and the CQI value of the last reception.
- transmission power, transmission speed, and the like can be determined based on the latest wireless communication quality, so that the reception accuracy at the terminal can be improved.
- the fluctuation amount of the wireless communication quality is determined based on the CQI value of the last reception and the CQI value of the reception two times before, but the present invention is not limited to this, and includes the past CQI values. You can also judge the amount of fluctuation.
- FIG. 11 is a diagram showing a configuration of a base station according to Embodiment 7 of the present invention, wherein a SIR (Signal to Interference Ratio) calculation unit 2 lc—l to 21 c—M and , A memory 22c-l to 22c-M, and a priority determination unit 11c.
- SIR Signal to Interference Ratio
- the SIR calculation unit 21c— :! 21 21 c — M stores the history of SIR values calculated for each slot or frame in memory 22 c ⁇ 1 to 22 c — M, and stores the history of CQI signals sent from terminals with large fluctuations in SIR values. Control is performed to increase the reception priority.
- FIG. 12 is a flowchart of a seventh embodiment showing a method for determining the reception priority of a CQI signal.
- the SIR calculator 21 c— :! It is assumed that ⁇ 21c-1M calculates the SIR value for each slot or frame by a known method and stores the history of the calculation results in the memory 22c-1 to 22c-M. I do.
- ⁇ 21c-1M calculates the SIR value for each slot or frame by a known method and stores the history of the calculation results in the memory 22c-1 to 22c-M. I do.
- processing different from the above-described third to sixth embodiments will be described.
- the priority determination unit 11c the number M of CQI signals to be received simultaneously and the HS-DPCC H demodulation processing units 3_1 to 3-N and the HS-DPCC H decoding processing units 4-1 to 4-N
- the number N is compared with the number N. If M> N (Step S2, Yes, Step S3), the previously calculated SIR value (SIR) stored in the memory 22c—1 to 22c—M is stored. (i, -1)) and the SIR value (SIR (i, one 2)) calculated two times before are calculated, and the calculated result is set as the priority P ri (i) (step S41). ).
- the terminal preferentially receives the CQI signal transmitted by the terminal determined to have a large difference between the SIR value calculated last time and the SIR value calculated two times before.
- the transmission power, the transmission speed, and the like can be determined based on the latest wireless communication quality, so that the reception accuracy at the terminal can be improved.
- the amount of change in the wireless communication quality is determined based on the SIR value calculated last time and the SIR value calculated two times before.
- the present invention is not limited to this. You can also judge the amount of fluctuation including the value.
- the configuration of the base station is the same as that of FIG. 3 of the second embodiment.
- the reception priority of a CQI signal from a terminal that has not been selected as a CQI signal to be received despite previous CQI transmission is increased. Control.
- FIG. 14 is a flowchart of Embodiment 8 showing a method of determining the reception priority of the CQI signal. It is one chart. Here, only processing different from the above-described third to seventh embodiments will be described.
- step S51 the number M of CQI signals to be received simultaneously and the HS-DPCC H demodulation processing units 3-1 to 3-N and the HS-DPCCH decoding processing units 4-1 to 4-N Then, if M> N (step S2, Yes, step S3), it is determined whether the terminal #i has received the CQI signal transmitted by the terminal #i at the last reception of the CQI. Investigate (step S51).
- step S51 if the previous CQI signal has not been received (step S51, No), the priority determination section 11a transmits the priority Pri () of the CQI signal transmitted by the corresponding terminal. i) is incremented (step S5). In the process of step S51, if the previous CQI signal has been received (step S51, Yes), the current Pri (i) is held.
- the reception priority of CQ I signals from terminals that have not been selected as CQ I signals to be received even though CQ ⁇ transmission was performed last time is increased. Control.
- the same effects as in Embodiment 3 described above can be obtained, and further, it is possible to prevent a situation in which CQI signals transmitted by specific terminals cannot be continuously received.
- the process of determining the reception priority of the CQI signal has been described with reference to FIG. 3, but the present invention is not limited to this, and the priority determination unit 1 shown in FIG.
- the above-described processing may be executed by the priority order judging section 11c in FIG. 1b and FIG.
- FIG. 15 is a diagram showing a configuration of a base station according to the ninth embodiment of the present invention.
- the priority determining unit 1-1a is connected to the scheduler 5a, but in FIG. 15, the priority determining unit 11d is connected to the bucket queue 7 .
- the same components as those in FIG. 1, FIG. 3, FIG. 9, or FIG. 11 are denoted by the same reference numerals, and description thereof will be omitted.
- a method of determining the reception priority of the CQI signal which is different from the third to eighth embodiments, will be described. In the present embodiment, control is performed to increase the reception priority of the CQI signal transmitted from the destination terminal having a large amount of packets waiting to be transmitted in the packet queue 7.
- FIG. 16 is a flowchart of Embodiment 9 showing a method of determining the reception priority of CQI signals. Here, only processing different from the above-described third to eighth embodiments will be described.
- the priority determination unit 11d the number M of CQI signals to be received simultaneously and the HS-DP CCH demodulation processing units 3-1 to 3-N and the HS-DPC CH decoding processing units 4-1 to 4
- the number N of one N is compared with the number N, and if M> N (Step S2, Yes, Step S3), the destination of the packet waiting to be transmitted stored in the packet queue 7 is investigated (Step S2). 61).
- the priority determination unit 11d sets the number of buckets waiting for transmission to each terminal #i obtained as a result of the above investigation as the priority Pri (i) (step S62).
- the priority Pri (i) the priority Pri (i)
- the processing (method of determining the reception priority of the CQI signal) of each priority determining section (11a to l1d) has been described individually.
- (Processes of Embodiments 3 to 9) may be combined to determine the priority order. For example, when the HARQ-ACK signal: NACK is received from a specific terminal more than ⁇ times since the last CQ I reception described in the fifth embodiment, the reception priority of the CQ I signal transmitted from that terminal is given.
- CQ I signal sent from terminal with large CQ I fluctuation described in Embodiment 6 Control that raises the reception priority of "", and reflect it in the priority.
- the selectivity of the CQI to be received is further improved, and the effect of further preventing the deterioration of throughput can be obtained.
- Embodiments 1 to 9 described above when the number M of CQI signals to be received simultaneously exceeds the number N of demodulation processing units and decoding processing units, the number of CQI signals transmitted from multiple terminals simultaneously is , And control to supply the result to the scheduler. On the other hand, for the CQ I signals transmitted from the remaining M ⁇ N terminals, the previously received CQ I value is used. It was controlled to be used, and as a result, the number of each processing unit was reduced.
- one HS-DPCCH demodulation processing unit demodulates CQI signals transmitted from a plurality of terminals in a time-division manner, thereby further reducing the number of HS-DPCCH demodulation processing units. Note that the method of Embodiments 1 to 9 described above is used for the process of selecting N out of M CQI signals transmitted simultaneously from a plurality of terminals.
- FIG. 17 is a diagram showing the concept of the tenth embodiment.
- one HS_DPCCH demodulation processing unit demodulates a CQ I signal sent from terminal # 1 in the first half and a CQ I signal sent from terminal # 2 in the second half. Then, each HS — DPCCH decoding unit inserts 0 into the symbols that have not been demodulated (the latter half of the CQI signal from terminal # 1 and the first half of the CQI signal from terminal # 2), and decodes each. Perform processing. As a result, CQI signals transmitted from two terminals can be processed by one HS-DPCCH demodulation processing unit.
- Fig. 1, Fig. 3, Fig. 9, Fig. 11 or The same components as those in FIG. 15 are denoted by the same reference numerals and description thereof will be omitted.
- the reception processing controller 1 e performs control to switch the code generated by the despreading code generators 2-1 to 2-L for each subframe. Perform (see the processing of Embodiments 1 to 9). Further, the reception processing control unit] e divides the CQ I signal sent from terminal #i and terminal #j into two slots, respectively, and for the first slot, the CQ I signal from terminal #i.
- the I-IS—DPCCH demodulator 3 e—1 to 3 e—L (L N / 2) to demodulate the CQ I signal from terminal #j, respectively. I do.
- the demodulated signal is sent to the HS-DPCC H decoding processing section 4 e—;! ⁇ 4 e-L, but for example, the demodulation output of the CQ I signal transmitted by terminal #i is missing the signal of the second slot, so when the demodulation of the first slot is completed,
- the corresponding HS-DPCC H decoding processing section decodes the signal in a state where 0 symbols are added as the second slot symbol by the 0 symbol insertion section 3 le.
- the demodulated output of the CQ I signal transmitted by terminal #j lacks the signal of the first slot
- the corresponding HS-DPCC H decoding processing unit A signal in a state where 0 symbol has been added as the first slot symphony by the 0 symbol input unit 31 e is decoded. That is, 113-0.
- the ⁇ ⁇ signal processing units 4 e-1 to 4 e-L decode CQI signals from two terminals by time division processing.
- one HS-DPCCH demodulation processing unit demodulates CQI signals sent from two terminals in a time-division manner.
- the number of HS—DPCCH demodulation processing units can be reduced, the circuit scale of the base station can be reduced, and the size and power consumption of the base station can be reduced.
- the first slot and the second slot are used as a time division method.
- control is performed to demodulate a CQI signal from another terminal, the present invention is not limited to this, and control may be performed so as to switch with an arbitrary symbol in a slot. This may improve the error correction capability in the decoding process.
- one HS-DPCC H demodulation processing unit demodulates CQI signals sent from two terminals in a time-division manner.
- the present invention is not limited to this.
- One HS—DPCCH demodulation processing unit may demodulate CQI signals sent from three or more units in a time-division manner. As a result, the number of HS-DP CCH demodulation processing units can be further reduced.
- switching of the CQI signals to be received is performed.
- switching control may be performed before the number of CQI signals to be received simultaneously exceeds the number of HS-DP CCI-im processing units. As a result, the switching can be performed smoothly.
- the switching control may be performed by comparing the number of connected terminals with the number of HS-DP CCH decoding processing units. In this case, switching control can be performed without considering the CQI reception timing from each terminal, so that the processing can be simplified.
- the above-described switching control is applied to the number of CQI signals, but similarly, it may be applied to the HARQ-ACK signal. As a result, the number of demodulation circuits (not shown) for ACKZNACK can be reduced.
- Embodiment 1 1.
- one HS-DPCCH demodulation processing unit controls to demodulate a CQI signal transmitted from a plurality of terminals in a time-division manner.
- the latest CQI value is discarded, and the scheduler uses the previous CQI value.
- FIG. 19 is a diagram showing a configuration of Embodiment 11 of a base station according to the present invention. It has a comparison / determination section 41 f _:!-41 f-L and a memory 42 ⁇ - 1-42 f-L. Note that the same components as those in FIG. 18 described above are denoted by the same reference numerals and description thereof is omitted. Here, only the processing different from the first embodiment will be described.
- the comparison judgment section 41 For example, the comparison judgment section 41 ⁇ ⁇ :! For ⁇ 41 f-L, the newly obtained CQ I value (HS-DPCC H decoding processing unit 4 e-:! ⁇ 4 e- L output) and the corresponding memory 2 f-1-4 f-L
- the stored CQI value is compared with the previously stored CQI value, and if the difference exceeds the specified value k, the new CQI value is discarded and the CQI value stored in the memory is sent to the scheduler 5 (where k is Predefined integer of 1 or more).
- the CQI value obtained in the processing of the above-described Embodiment 10 has a weaker resistance to a communication channel error than the CQI value obtained in the processing of the above-described Embodiments 1 to 9. If it is significantly different from the previous CQ I value, it is highly likely that a decoding error has occurred. Therefore, in the present embodiment, when the newly obtained CQI value is significantly different from the previous CQI value, the new CQI value is discarded. As a result, it is possible to prevent characteristic deterioration that can occur at the cost of reducing the circuit size.
- the CQI value to be compared is the previous CQI value; however, the present invention is not limited to this, and it is also possible to compare past CQI values.
- FIG. 20 is a diagram showing a configuration of a base station according to the twelfth embodiment of the present invention, in which a reception processing control unit 1 g for switching between the processing of the first embodiment and the processing of the tenth embodiment according to the communication state is illustrated.
- the HS-DPCC H demodulation processing unit having the function of the HS-DPCC H demodulation processing unit in both Embodiment 1 and Embodiment 3 3 g— :! And 3 g—N, and HS—DPCCH decoding processing unit 4 g—1 to 4 g—N having the function of the HS-DPCC H decoding processing unit in both the first and tenth embodiments.
- a threshold value judging section 51 g—1 to 51 g—N and a demodulation scheme selecting section 52 g are provided.
- the same components as those in FIGS. 1, 11, and 18 described above are denoted by the same reference numerals, and description thereof will be omitted. Here, only the processing different from the first and tenth embodiments will be described.
- the SIR calculation result is assumed as a criterion for judging the communication state.
- the SIR calculation unit 21 c— :! ⁇ 21c-N is assumed to calculate the SIR value for each slot or each frame by a known method.
- each SIR value calculated by the SIR calculation sections 21c-1 to 21cN is compared with a corresponding threshold value defined in advance. Then, based on the comparison result, for example, if m or more SIR values are larger than the threshold, demodulation method selection section 52g selects reception processing control section 1 so as to select the processing of Embodiment 10. Instruct g. On the other hand, if the comparison result indicates that the number of SIR values larger than the threshold value does not reach m, the reception processing control unit 1g is instructed to select the processing of Embodiment 1 (see the above description). m is a predetermined integer of 1 or more).
- the process of Embodiment 10 is selected, and if the SIR value is bad, the process of Embodiment 1 is selected. Control.
- the same effect as in the first embodiment and the tenth embodiment can be obtained while reducing the circuit scale.
- the power of simultaneously performing the demodulation processing of Embodiment 1 or the demodulation processing of Embodiment 10 on all CQI signals is not limited to this.
- Any demodulation processing may be performed for each CQI signal.
- the processing in the tenth embodiment is controlled so that the processing is performed when the SIR value is good, and the processing in the first embodiment is performed when the SIR value is poor.
- a CRC (Cyclic Redundancy Check) error rate of A-DPC H is used as a criterion for determining the communication state. That is, by determining the reception block error, the deterioration of the characteristics of the reception CQI is prevented.
- FIG. 21 is a diagram showing a configuration of a base station according to the thirteenth embodiment of the present invention, in which an A-DPCH demodulation processing unit 61 h-l to 61 h-N, and an A-DPCH decoding processing unit 6 211-1 to 6211- ⁇ , a CRC determination unit 63h-l to 63h-N, and a demodulation method selection unit 52h.
- an A-DPCH demodulation processing unit 61 h-l to 61 h-N and an A-DPCH decoding processing unit 6 211-1 to 6211- ⁇
- a CRC determination unit 63h-l to 63h-N a demodulation method selection unit 52h.
- the CRC error rate of A—DPCH is assumed as a criterion for determining the communication state.
- A—DPCH demodulation processing section 61 h— :! ⁇ 61h-N and A-DPCH decoding processor 62h_l ⁇ 62h-N are assumed to demodulate and decode the A-DPCH signal by a known method.
- the CRC determination of the decoded A-DPCH signal is performed to determine the presence or absence of a block error. Then, based on the determination result, for example, when there are block errors in m or more CRC determination units, the demodulation method selection unit 52h instructs the reception processing control unit 1g to select the processing of the first embodiment. Instruct to. On the other hand, if the number of CRC determination units with block errors does not reach m, the reception processing control unit 1g is instructed to select the processing of Embodiment 10 (where m is a predefined value). An integer greater than or equal to 1).
- Embodiment 1 when there are many channels with poor A-DPCH CRC determination, the processing of Embodiment 1 is performed, and the A-DPCH CRC determination is good. If there are many channels, control is performed so as to select the processing of the tenth embodiment. This makes it possible to obtain the same effects as in the first and tenth embodiments while reducing the circuit scale.
- the demodulation processing of Embodiment 1 or the demodulation processing of Embodiment 10 is simultaneously performed on all CQI signals.
- the present invention is not limited to this.
- Such a demodulation process may be performed.
- the processing of Embodiment 1 is selected for a channel having a CRC block error in A—DPCH, and the processing of Embodiment 10 is selected for other channels.
- Embodiment 1 4.
- a demodulation scheme selection process different from Embodiments 12 and 13 for example, a difference between a newly obtained CQI value and a previous CQI value is used as a selection criterion.
- FIG. 22 is a diagram showing a configuration of Embodiment 14 of the base station according to the present invention.
- the base station includes counters 71 i ⁇ 1 to 71 i ⁇ N and a demodulation method selection unit 52 i. Have.
- the same components as those in FIG. 19, FIG. 20, or FIG. 21 described above are denoted by the same reference numerals, and description thereof will be omitted. Here, only the processing different from the embodiment 12 or 13 will be described.
- the demodulation method selection unit 52 i selects the processing of the tenth embodiment. For example, the counter 7 1 i - In :! ⁇ 7 1 i-N, based on the comparison result by the comparison determination unit 4 1 f one 1 ⁇ 4 1 ⁇ one N corresponding, if the difference is k 1 or more, Cow Up.
- the demodulation method selection unit 52 i instructs the reception processing control unit 1g to perform the demodulation processing and the decoding processing according to the first embodiment. Then reset the counter.
- the demodulation method selection unit 52 i issues an instruction to select the processing of the first embodiment. If the difference is less than or equal to k 2, the counter 71 i- 1 to 71 i-N counts up if the difference is equal to or less than k2 based on the comparison result by the corresponding comparison / determination unit 41 f-1 to 41 f-N .
- demodulation method selection section 52i instructs reception processing control section 1g to perform demodulation processing and decoding processing according to the tenth embodiment. Then, the counter is reset (kl, k2, nl, n2 are predetermined integers of 1 or more).
- control is performed so that the processing of Embodiment 1 is selected in a poor communication environment in which decoding errors increase in the processing of Embodiment 10, and the processing is performed in other cases.
- Control is performed so as to select the processing of mode 10.
- the counter counts up based on the result of comparison between the newly obtained CQ 1 value and the previous CQ I value.However, a function of counting down may be added. Good. For example, when the process of the tenth embodiment is selected and the difference between the newly obtained CQ I value and the previous CQ 1 value is equal to or less than k 1 ′, the countdown is performed. In addition, when the processing of the first embodiment is selected and the difference between the newly obtained CQI value and the previous CQI value is k 2 or more, the countdown is performed. As a result, it is possible to increase the accuracy of the determination of the process switching.
- the difference obtained as a result of comparison between the newly obtained CQ I value and the corresponding CQ I value before is used as a criterion for selecting a demodulation method.
- the newly obtained CQI value is significantly different from the previous CQI value, the previous CQI value may be supplied to the scheduler.
- one HS-DPCC H demodulation processing unit is By demodulating the CQI signal in one subframe sent from several terminals in a time-division manner, the number of HS-DPCCH demodulation processing units was reduced.
- the CQI signal when the CQI signal is repeatedly transmitted in a plurality of subframes, the CQI signal is demodulated in a time-division manner for each subframe, so that the number of HS-DPCCH demodulation processing units is reduced. Reduce the number.
- FIG. 23 is a diagram showing a concept of the fifteenth embodiment.
- one HS—DP CCH demodulation processing unit is transmitted from, for example, terminal # 1 in the first subframe.
- the CQI signal sent from the two terminals is converted to one HS- Demodulated by DPCC H demodulation processing unit.
- the reception processing control unit generates a code generated by the despreading code generation units 2-1 to 2-L. Control is performed so as to switch every subframe.
- one HS-DPCCH demodulation processing section demodulates CQI signals sent from a plurality of terminals in a time-division manner. This makes it possible to reduce the number of HS-DPCC 1-1 demodulation processing units, thereby reducing the circuit size of the base station, and consequently realizing miniaturization and power saving of the base station.
- Embodiment 16
- FIG. 24 is a diagram showing a configuration of the base station according to the sixteenth embodiment of the present invention.
- the base station includes a reception processing control unit lj, a memory 81 j, and a selector 82 j—; Have. Note that the same components as those in FIG. 1 described above are denoted by the same reference numerals and description thereof is omitted. Here, only the processing different from the first embodiment will be described.
- Memory 81 j stores the received signal for one subframe.
- the selectors 82 j-1 to 82 j-N have selected the input signal side.
- reception processing control is performed.
- the unit 1 j controls the codes of the despreading code generation units 2-1 to 2-N, and first, the HS-DPCCH demodulation processing unit 3-:! ⁇ 3—Controls N.
- the reception processing control unit 1 j switches the selectors 82 j — 1 to 82 j — N corresponding to the M ⁇ N CQ I signals to the memory 81 j in the next subframe, and the corresponding despreading code.
- the control unit controls the code of the generation unit, and further controls the HS-DPCC H demodulation processing unit 3-].-3-N to demodulate the remaining M_N CQI signals.
- the HS-DPCC H demodulation processing unit performs processing (demodulation processing on the selected N CQI signals) such as the next subframe on the CQI signals transmitted from the remaining N ⁇ M terminals.
- the demodulation is performed by using the time not performed.
- Embodiment 1 described above if the number of connected terminals increases and the number M of CQI signals to be received simultaneously exceeds the number N of HS—DPCCH demodulation processing units (M> N), multiple terminals It selectively receives N out of the M transmitted CQI signals and supplies the decoding result to the scheduler.
- the previous CQI values were read from memory and used.
- the remaining M—N terminals For the CQI signal sent from use the previous CQI value as it is, instead of using the previous CQI value as it is, using the number of ACKZN ACK receptions.
- FIG. 25 is a diagram showing a configuration of a seventeenth embodiment of the base station according to the present invention, wherein an ACK / NACK counter 91 k ⁇ 1 to 91 k ⁇ 1 M and a CQ I value correction unit 92 k ⁇ 1 to 921 are shown. ⁇ —1 and.
- the same components as those in FIG. 1 described above are denoted by the same reference numerals, and description thereof is omitted. Here, only the processing different from the first embodiment will be described.
- the operation of the base station configured as described above will be described.
- the CQI value correction unit supplied with the CQI values corresponding to the remaining ⁇ — ⁇ terminals reads out from the memory 6 when the N AC / count value of the corresponding ACK / N AC ⁇ counter is k 3 or more. J1 is subtracted from the CQI value, and the subtracted CQI value is supplied to the scheduler 5 as the CQI value from the remaining terminals (k1, j1 are predetermined integers of 1 or more).
- the CQI value correction unit supplied with the CQI values corresponding to the remaining M ⁇ N terminals reads out from the memory 6 when the corresponding AC KZN AC K counter has an AC K count value of k 4 or more. J2 is added to the calculated CQI value, and the added CQI value is supplied to the scheduler 5 as a CQI value from the remaining terminals (k2, j2 are predetermined integers of 1 or more).
- the number of connected terminals increases and the number M of CQI signals to be received simultaneously exceeds the number N of HS-DP CCH demodulation processing units
- multiple terminals N of the M CQ I signals sent are selectively received and received. Is controlled so as to supply the decoding result to the scheduler.
- the previous CQ I value was corrected by the number of A CKZN ACK receptions.
- the number of I-IS-DPC CH demodulation processing units can be reduced, and furthermore, by correcting the CQI value, it is possible to prevent throughput from deteriorating due to fluctuations in wireless communication quality.
- the CQI value is corrected based on the ACK / NACK count value.
- the present invention is not limited to this.
- the CQI value can be corrected based on an SIR value or the like. is there. Industrial applicability
- the base station according to the present invention is useful as a base station configuring a communication system for performing packet data transmission, and in particular, as a base station configuring a mobile communication system specified in 3GPP. Are suitable.
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Abstract
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| PCT/JP2004/008644 WO2005122263A1 (ja) | 2004-06-14 | 2004-06-14 | 基地局および受信方法 |
| JP2006519198A JPWO2005122263A1 (ja) | 2004-06-14 | 2004-06-14 | 基地局および受信方法 |
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| PCT/JP2004/008644 WO2005122263A1 (ja) | 2004-06-14 | 2004-06-14 | 基地局および受信方法 |
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| CN100426714C (zh) * | 2006-01-18 | 2008-10-15 | 华为技术有限公司 | 信道质量指示校准及基站调度用户数据的方法及装置 |
| WO2010134196A1 (ja) * | 2009-05-22 | 2010-11-25 | 富士通株式会社 | 通信システム及び情報伝送方法及びコード設定方法及び基地局及び移動局 |
| WO2011013712A1 (ja) * | 2009-07-28 | 2011-02-03 | 京セラ株式会社 | 無線基地局及び通信制御方法 |
| WO2011013781A1 (ja) * | 2009-07-29 | 2011-02-03 | 京セラ株式会社 | 無線基地局及び通信制御方法 |
| WO2013088710A1 (ja) * | 2011-12-12 | 2013-06-20 | 京セラ株式会社 | 基地局、通信システム、及び通信方法 |
| JP2019075765A (ja) * | 2017-10-19 | 2019-05-16 | 株式会社デンソー | 復号装置 |
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| JP2004166123A (ja) * | 2002-11-15 | 2004-06-10 | Matsushita Electric Ind Co Ltd | 基地局装置及びmcs選択方法 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100426714C (zh) * | 2006-01-18 | 2008-10-15 | 华为技术有限公司 | 信道质量指示校准及基站调度用户数据的方法及装置 |
| WO2010134196A1 (ja) * | 2009-05-22 | 2010-11-25 | 富士通株式会社 | 通信システム及び情報伝送方法及びコード設定方法及び基地局及び移動局 |
| JP5375955B2 (ja) * | 2009-05-22 | 2013-12-25 | 富士通株式会社 | 通信システム及び情報伝送方法及びコード設定方法及び基地局及び移動局 |
| US8660228B2 (en) | 2009-05-22 | 2014-02-25 | Fujitsu Limited | Communication system, information transmission method, code setting method, base station, and mobile station |
| WO2011013712A1 (ja) * | 2009-07-28 | 2011-02-03 | 京セラ株式会社 | 無線基地局及び通信制御方法 |
| JP2011030092A (ja) * | 2009-07-28 | 2011-02-10 | Kyocera Corp | 無線基地局及び通信制御方法 |
| WO2011013781A1 (ja) * | 2009-07-29 | 2011-02-03 | 京セラ株式会社 | 無線基地局及び通信制御方法 |
| JP2011030139A (ja) * | 2009-07-29 | 2011-02-10 | Kyocera Corp | 無線基地局及び通信制御方法 |
| WO2013088710A1 (ja) * | 2011-12-12 | 2013-06-20 | 京セラ株式会社 | 基地局、通信システム、及び通信方法 |
| JPWO2013088710A1 (ja) * | 2011-12-12 | 2015-04-27 | 京セラ株式会社 | 基地局、通信システム、及び通信方法 |
| JP2019075765A (ja) * | 2017-10-19 | 2019-05-16 | 株式会社デンソー | 復号装置 |
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