WO2018173176A1 - Terminal utilisateur, station de base radio et système de radiocommunication - Google Patents

Terminal utilisateur, station de base radio et système de radiocommunication Download PDF

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Publication number
WO2018173176A1
WO2018173176A1 PCT/JP2017/011551 JP2017011551W WO2018173176A1 WO 2018173176 A1 WO2018173176 A1 WO 2018173176A1 JP 2017011551 W JP2017011551 W JP 2017011551W WO 2018173176 A1 WO2018173176 A1 WO 2018173176A1
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sequence length
occ
base station
sequence
radio resources
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PCT/JP2017/011551
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English (en)
Japanese (ja)
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敬佑 齊藤
洋介 佐野
一樹 武田
聡 永田
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株式会社Ｎｔｔドコモ
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Priority to PCT/JP2017/011551 priority Critical patent/WO2018173176A1/fr
Publication of WO2018173176A1 publication Critical patent/WO2018173176A1/fr

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  • the present invention relates to a user terminal, a radio base station, and a radio communication system.
  • LTE Long Term Evolution
  • Non-patent Document 1 a successor system of LTE is also being studied for the purpose of further widening the bandwidth and speeding up from LTE.
  • LTE successors include LTE-A (LTE-Advanced), FRA (Future Radio Access), 5G (5th generation mobile mobile communication system), 5G + (5G plus), New-RAT (Radio Access Technology), etc. There is what is called.
  • 5G is expected to support a wide range of frequencies from low carrier frequencies to high carrier frequencies and realize various requirements.
  • a multiplexing method of PUCCH Physical-Uplink-Control-Channel
  • a DMRS Demodulation Reference Signal
  • multiplexing by an orthogonal code is considered as one of multiplexing methods of these signals.
  • signals of various patterns can be orthogonally multiplexed in order to realize high-speed communication and large-capacity communication.
  • orthogonal codes have restrictions on the sequence length, and there are restrictions on the pattern of multiplexed signals. For example, the number of symbols of a signal multiplexed with an orthogonal code is restricted by the sequence length of the orthogonal code.
  • an object of the present invention is to provide a technique for reducing signal pattern restrictions in signal multiplexing using orthogonal codes.
  • the user terminal that transmits a signal to the radio base station of the present invention includes: a generation unit that generates an orthogonal code for orthogonally multiplexing the signal; and a sequence length of the orthogonal code is determined by a number of radio resources allocated to the signal.
  • An extension unit that cyclically expands the orthogonal code so that the sequence length is equal to the number of radio resources.
  • the radio base station that transmits a signal to the user terminal includes: a generation unit that generates an orthogonal code for orthogonally multiplexing the signal; and a sequence length of the orthogonal code is greater than a number of radio resources allocated to the signal.
  • An extension unit that cyclically expands the orthogonal code so that the sequence length is equal to the number of radio resources.
  • the user terminal In a radio communication system having a user terminal and a radio base station according to the present invention, the user terminal generates a first orthogonal code for orthogonally multiplexing a first signal to be transmitted to the radio base station.
  • the first sequence length of the generator and the first orthogonal code is smaller than the number of first radio resources allocated to the first signal, the first sequence length is the first radio resource.
  • a first extension unit that cyclically extends the first orthogonal code so that the second signal to be transmitted to the user terminal is orthogonally multiplexed.
  • a second generation unit that generates a second orthogonal code for the second orthogonal code, and a second sequence length of the second orthogonal code is smaller than the number of second radio resources allocated to the second signal,
  • the second sequence length is the same as the number of the second radio resources In so that, having a second extension portion which cyclically extended the second orthogonal code.
  • signal pattern restrictions can be reduced in signal multiplexing using orthogonal codes.
  • FIG. 1 is a diagram illustrating a configuration example of a radio communication system according to the first embodiment.
  • the radio communication system includes a CC (Central Control Unit) 1, a MeNB (Macro Base Station) 2, an MMeNB (Massive-MIMO Base Station) 3, and user terminals 4a to 4c. is doing.
  • CC Central Control Unit
  • MeNB Micro Base Station
  • MMeNB Massive-MIMO Base Station
  • user terminals 4a to 4c is doing.
  • FIG. 1 only one MMeNB 3 is shown, but a plurality of MMeNBs 3 may exist.
  • MeNB2 forms a wide-area cell 2a.
  • the MMeNB 3 forms a narrow cell 3a smaller than the cell 2a.
  • 5G it is conceivable that a heterogeneous network in which a plurality of narrow-area cells 3a are formed in a wide-area cell 2a is adopted.
  • the user terminals 4a to 4c are located in the cell 3a formed by the MMeNB 3, the user terminals 4a to 4c can perform radio communication with both the MeNB 2 and the MMeNB 3.
  • the MMeNB 3 is, for example, a radio base station having several hundred antennas.
  • the MMeNB 3 controls the amplitude and phase of the transmission signal using a plurality of antennas, forms a transmission beam having directivity in the user terminals 4a to 4c (BF: beam forming), and performs signal transmission.
  • BF beam forming
  • MMeNB3 can implement
  • MeNB2 and MMeNB3 are connected to CC1.
  • CC1 is connected to the core network (CN).
  • CN core network
  • CC1 is, for example, an access gateway device, an RNC (Radio Network Controller), or an MME (Mobility Management Entity).
  • RNC Radio Network Controller
  • MME Mobility Management Entity
  • FIG. 2 is a diagram for explaining an example of orthogonal multiplexing of PUCCH by OCC.
  • “RE” illustrated in FIG. 2 indicates a resource element.
  • the resource element is a radio resource area defined by one symbol and one subcarrier.
  • RU shown in FIG. 2 indicates a resource unit.
  • the resource unit is composed of, for example, 14 symbols and 12 subcarriers, and is defined by 168 resource elements.
  • a resource unit is also called a resource block or a resource block pair.
  • One subframe is composed of, for example, 14 symbols.
  • the PUCCH 11a illustrated in FIG. 2 indicates the PUCCH of the user terminal L1.
  • PUCCH11b shown in FIG. 2 has shown PUCCH of user terminal L2.
  • PUCCH 11a and PUCCH 11b may be layer 1 and layer 2 PUCCHs of the same user terminal.
  • the PUCCH 11a and the PUCCH 11b shown in FIG. 2 are orthogonally multiplexed by OCC. Thereby, the radio base station can separate the PUCCH 11a of the user terminal L1 and the PUCCH 11b of the user terminal L2 using the despreading process.
  • FIG. 3 is a diagram for explaining an example of the OCC series.
  • FIG. 3 shows a Walsh sequence as an example of the OCC sequence.
  • the Walsh sequence when the sequence length is “n”, a maximum of n layers can be orthogonally multiplexed when “n” is a power of 2.
  • the user terminals 4a to 4c extend the OCC sequence and orthogonally multiplex PUCCHs having various symbol lengths. For example, when the number of PUCCH symbols is “14”, the user terminals 4a to 4c generate a Walsh sequence having a sequence length “8”, and the generated Walsh sequence having a sequence length “8” is set to a sequence length “14”. Cyclic expansion is performed to orthogonally multiplex PUCCHs with “14” symbols.
  • FIG. 4 is a diagram showing a block configuration example of the user terminal 4a.
  • the user terminal 4a includes an application unit 21, a transmission signal generation unit 22, an encoding / modulation unit 23, an OCC generation unit 24, a cyclic extension unit 25, a mapping unit 26, an RF
  • the transmitter / receiver 27, the antenna 28, the controller 29, and the demodulator / decoder 30 are provided. Since the user terminals 4b and 4c have the same block configuration as the user terminal 4a, the description thereof is omitted.
  • the application unit 21 performs, for example, processing related to a layer higher than the physical layer or the MAC layer.
  • the transmission signal generator 22 generates a UL signal including a UL data signal and a UL control signal.
  • user data output from the application unit 21 is included in the UL data signal included in the UL signal.
  • the UL control signal included in the UL signal includes demodulation RS (Reference Signal) and UCI (Uplink Control Information).
  • the UL data signal is transmitted using, for example, PUSCH (Physical Downlink Shared Channel).
  • the UL control signal is transmitted using, for example, PUCCH.
  • the encoding / modulation unit 23 encodes the UL signal output from the transmission signal generation unit 22 based on UL MCS (ModulationModCoding Scheme) information demodulated and decoded by the demodulation / decoding unit 30. And modulation processing.
  • UL MCS ModulationModCoding Scheme
  • the OCC generation unit 24 generates an OCC sequence for orthogonally multiplexing signals to be transmitted to the radio base station. For example, the OCC generation unit 24 generates an OCC sequence for orthogonally multiplexing PUCCH. The OCC generation unit 24 generates, for example, a Walsh sequence as the OCC sequence.
  • the cyclic extension unit 25 when the sequence length of the OCC sequence generated by the OCC generation unit 24 is smaller than the number of radio resources allocated to the signal transmitted to the radio base station in the time direction, The OCC sequence is cyclically extended so that the sequence length of the sequence is the same as the number of radio resources in the time direction. For example, when the sequence length of the OCC sequence generated by the OCC generation unit 24 is smaller than the number of symbols allocated to the PUCCH, the cyclic extension unit 25 cycles the OCC sequence so as to be the same as the number of symbols allocated to the PUCCH. Expand.
  • the mapping unit 26 maps the UL signal output from the encoding / modulation unit 23 to a predetermined radio resource based on the UL scheduling information demodulated and decoded by the demodulation / decoding unit 30.
  • the mapping unit 26 performs mapping by multiplying the OCC sequence generated by the OCC generation unit 24 or the OCC sequence cyclically extended by the cyclic extension unit 25.
  • the RF transceiver unit 27 performs transmission processing such as up-conversion and amplification on the UL signal output from the mapping unit 26, and transmits the UL signal to the radio base station from the plurality of antennas 28.
  • the RF transmitter / receiver 27 performs reception processing such as amplification and down-conversion on DL (Down Link) signals received by the plurality of antennas 28 and transmitted by the radio base station.
  • the DL signal transmitted by the radio base station includes, for example, a DL data signal, a DL control signal, a demodulation RS, and the like.
  • the DL data signal is transmitted using, for example, PDSCH (Physical Downlink Shared Channel).
  • the DL control signal is transmitted using, for example, PDCCH (Physical Downlink Control Channel).
  • the control unit 29 separates (demappings) the DL control signal and the demodulation RS from the DL signal output from the RF transmission / reception unit 27.
  • the control unit 29 estimates the channel state based on the demapped RS for demodulation.
  • the control unit 29 outputs the estimated channel state to the demodulation / decoding unit 30.
  • control unit 29 generates a DL data signal for the own device from the DL signal output from the RF transmission / reception unit 27 based on the scheduling information (DL radio resource allocation information) output from the demodulation / decoding unit 30. Separate (demapping).
  • the demodulation / decoding unit 30 demodulates and decodes the DL control signal and the DL data signal demapped by the control unit 29 based on the channel state estimated by the control unit 29.
  • the demodulation / decoding unit 30 outputs the DL schedule information included in the demodulated and decoded DL control signal to the control unit 29.
  • the demodulation / decoding unit 30 outputs UL schedule information and MCS information included in the demodulated and decoded DL control signal to the encoding / modulation unit 23 and the mapping unit 26.
  • the demodulation / decoding unit 30 outputs the demodulated and encoded DL data signal to the application unit 21.
  • Signal waveforms transmitted and received between the user terminal 4a and the radio base station are OFDM (Orthogonal Frequency Division Multiplexing), SC-FDMA (Single Carrier-Frequency Division Multiple Access), or DFT-S-OFDM (DFT-OFDM).
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • DFT-S-OFDM DFT-OFDM
  • a signal waveform based on Spread-OFDM) may be used.
  • description of components for generating a signal waveform (for example, IFFT processing unit, CP adding unit, CP removing unit, FFT processing unit, etc.) is omitted. Also, in FIG. 4, description of a configuration unit (for example, a precoding unit) for performing the MIMO processing is omitted.
  • the downlink channel and uplink channel transmitted and received between the user terminal 4a and the radio base station are not limited to the above PDCCH, PDSCH, PUCCH, PUSCH, and the like.
  • other channels such as PBCH (Physical Broadcast Channel) and RACH (Random Access Channel) are included in the downlink and uplink channels transmitted and received between the user terminal 4a and the radio base station.
  • PBCH Physical Broadcast Channel
  • RACH Random Access Channel
  • FIG. 5 is a diagram for explaining an example of cyclic extension of the OCC sequence.
  • An OCC sequence 41 a illustrated in FIG. 5 illustrates an example of an OCC sequence having a sequence length “4” generated by the OCC generation unit 24.
  • An OCC sequence 41b illustrated in FIG. 5 illustrates an example of an OCC sequence that is cyclically extended by the cyclic extension unit 25.
  • the OCC generation unit 24 generates an OCC sequence having a sequence length smaller than “6”.
  • the OCC generation unit 24 generates an OCC sequence [a b c d] having a sequence length of “4” as illustrated in the OCC sequence 41a of FIG.
  • the cyclic extension unit 25 When the sequence length of the OCC sequence generated by the OCC generation unit 24 is smaller than the number of symbols of the orthogonally multiplexed signal, the cyclic extension unit 25 has the same sequence length of the OCC sequence as the number of symbols of the orthogonally multiplexed signal.
  • the OCC sequence is cyclically extended so that
  • the number of symbols of the orthogonally multiplexed signal is “6”.
  • the sequence length of the OCC sequence 41a generated by the OCC generation unit 24 is “4”. Therefore, the cyclic extension unit 25 cyclically extends the OCC sequence having the sequence length “4” generated by the OCC generation unit 24 so that the sequence length becomes “6”. Specifically, as shown in the OCC sequence 41b shown in FIG. 5, the cyclic extension unit 25 adds the first two codes [a b] of the OCC sequence [a b c d] generated by the OCC generation unit 24 to the tail. Copied after the code [d], the sequence length of the OCC sequence generated by the OCC generation unit 24 is cyclically extended.
  • the user terminal 4a can perform orthogonal multiplexing on a signal having a symbol length in which “n” is not a power of 2.
  • the sequence length of the OCC sequence before applying the cyclic extension generated by the OCC generation unit 24 is “4”. Therefore, the signals of each layer can be multiplexed at maximum “4”.
  • Each of the user terminals 4a to 4c can orthogonally multiplex PUCCHs having different numbers of symbols by cyclic extension of the OCC sequence.
  • FIG. 6 is a first diagram illustrating an example of orthogonal multiplexing of PUCCH.
  • PUCCHs 42a to 42c shown in FIG. 6 indicate the PUCCHs of the user terminals 4a to 4c.
  • Squares shown in FIG. 6 indicate symbols.
  • a number in parentheses in a symbol indicated by a square indicates a sequence number of the OCC sequence. In the following, the symbol indicated by the leftmost square is the “0th” symbol.
  • the PUCCH 42a of the user terminal 4a is assigned to the “0th” to “11th” symbols.
  • the 13th and 14th symbols are DL.
  • the PUCCH 42b of the user terminal 4b is assigned to the “second” to “13th” symbols.
  • the 0th and 2nd symbols are GP (Guard Period).
  • the PUCCH 42c of the user terminal 4c is assigned to symbols “0th” to “13th”.
  • the number of symbols of the PUCCH 42a of the user terminal 4a is “12”.
  • the number of symbols of the PUCCH 42b of the user terminal 4b is “12”.
  • the number of symbols of the PUCCH 42c of the user terminal 4c is “14”.
  • the OCC generation unit 24 of each user terminal 4a to 4c generates an OCC sequence having a sequence length of “8” as an OCC sequence (for example, a Walsh sequence) in which PUCCHs 42a to 42c are orthogonally multiplexed.
  • an OCC sequence for example, a Walsh sequence
  • sequence length of the OCC sequence generated by the OCC generation unit 24 of the user terminals 4a to 4c is “8”, which is smaller than the symbol number “12” of the PUCCH 42a and the PUCCH 42b and the symbol number “14” of the PUCCH 42c.
  • the cyclic extension unit 25 of the user terminals 4a and 4b cyclically extends the OCC sequence having the sequence length “8” generated by the OCC generation unit 24 so that the sequence length becomes “12”.
  • the cyclic extension unit 25 of the user terminal 4c cyclically extends the OCC sequence having the sequence length “8” generated by the OCC generation unit 24 so that the sequence length becomes “14”.
  • the cyclic extension unit 25 of the user terminal 4a copies the orthogonal codes of the sequence numbers “0” to “3” behind the rear sequence number “7”.
  • the cyclic extension unit 25 of the user terminal 4b copies the orthogonal codes of the sequence numbers “2” to “5” behind the rear sequence number “1”.
  • the cyclic extension unit 25 of the user terminal 4c copies the orthogonal codes of the sequence numbers “0” to “5” behind the rear sequence number “7” as indicated by an arrow A3 in FIG.
  • the mapping unit 26 of the user terminal 4a maps the PUCCH to the “12th” symbol from “0th” to “11th” as indicated by the PUCCH 42a in FIG. At that time, the mapping unit 26 multiplies the OCC sequence having the sequence length “12” cyclically extended by the cyclic extension unit 25.
  • the mapping unit 26 of the user terminal 4b maps the PUCCH to the “12” symbols from “second” to “11” as indicated by the PUCCH 42b in FIG. At that time, the mapping unit 26 multiplies the OCC sequence having the sequence length “12” cyclically extended by the cyclic extension unit 25.
  • the mapping unit 26 of the user terminal 4c maps the PUCCH to the “14th” symbol from “0th” to “13th”, as indicated by the PUCCH 42c in FIG. At that time, the mapping unit 26 multiplies the OCC sequence having the sequence length “14” cyclically extended by the cyclic extension unit 25.
  • the user terminals 4a to 4c can apply the OCC sequence having a common sequence length regardless of the number of symbols allocated to the PUCCH by cyclic extension of the OCC sequence.
  • the user terminals 4a to 4c can apply an OCC sequence having a sequence length of “8”.
  • the user terminals 4a to 4c can orthogonally multiplex PUCCHs 42a to 42c having different numbers of symbols.
  • the radio base station can separate the PUCCHs 42a to 42c of the user terminals 4a to 4c using the despreading process corresponding to the OCC sequence having the sequence length “8”.
  • the user terminal can multiplex up to 8 layers.
  • each OCC generation unit 24 of the user terminals 4a to 4c may generate an OCC sequence having a predetermined sequence length based on, for example, a predetermined algorithm.
  • each OCC generation unit 24 of the user terminals 4a to 4c may specify the sequence length (or spreading factor) information from the radio base station by higher layer signaling or physical layer signaling, for example.
  • the higher layer signaling is, for example, RRC (Radio Resource Control) signaling.
  • the physical layer signaling is information included in downlink control information (DCI: Downlink Control Information) transmitted by PDCCH or EPDCCH, for example.
  • DCI Downlink Control Information
  • the OCC generation unit 24 of the user terminals 4a to 4c may generate an OCC sequence smaller than the number of symbols “8” of the PUCCHs 42a and 42b.
  • the OCC generation unit 24 of the user terminals 4a to 4c may generate an OCC sequence having a sequence length “2” or “4”.
  • the cyclic extension unit 25 of each user terminal 4a to 4c performs cyclic extension so that the sequence length of the OCC sequence generated by the OCC generation unit 24 is the same as the number of symbols of the PUCCHs 42a to 42c.
  • FIG. 7 is a second diagram illustrating an example of orthogonal multiplexing of PUCCH.
  • PUCCH43a, 43b shown in FIG. 7 has shown PUCCH of the user terminal 4a.
  • Squares shown in FIG. 7 indicate symbols.
  • a number in parentheses in a symbol indicated by a square indicates a sequence number of the OCC sequence. In the following, the symbol indicated by the leftmost square is the “0th” symbol.
  • the OCC generation unit 24 generates the OCI sequences of the UCI and the demodulation RS of the UL control signal transmitted using the PUCCH.
  • the OCC generation unit 24 generates respective OCC sequences of UCI and demodulation RS transmitted on the PUCCH.
  • the numbers of UCI and demodulation RS symbols transmitted on the PUCCH 43a are “8” and “4”, respectively, and both are powers of 2. Therefore, the OCC generation unit 24 generates an OCC sequence having a sequence length of “8”, An OCC sequence having a sequence length of “4” is generated.
  • the mapping unit 26 maps the UCI to symbols (“0, 2, 3, 5, 6, 8, 9, 11th symbols) that are not shaded, as indicated by the PUCCH 43a. 26 multiplies the OCC sequence of sequence length “8” generated by the OCC generation unit 24.
  • mapping section 26 maps the demodulating RS to the hatched symbols ("1, 4, 7, and 10th symbols).
  • the OCC sequence having the sequence length “4” generated by the generation unit 24 is multiplied.
  • the user terminal 4a can orthogonally multiplex the UCI and demodulation RS transmitted using the PUCCH 43a.
  • the user terminal 4a can orthogonally multiplex UCI and demodulation RS using an OCC sequence having a common sequence length. For example, as shown in PUCCH 43b, even if the number of symbols increases from “12” to “14”, user terminal 4a uses the OCC sequences of sequence length “8” and sequence length “4” used in PUCCH 43a. , UCI and demodulation RS can be orthogonally multiplexed.
  • the numbers of UCI and demodulation RS symbols of PUCCH 43b are “9” and “5”.
  • the cyclic extension unit 25 cyclically extends the OCC sequences having the sequence length “8” and the sequence length “4” used in the PUCCH 43a.
  • the cyclic extension unit 25 cyclically extends the OCC sequence as indicated by arrows A2a and A2b.
  • the user terminal 4a orthogonally multiplexes UCI with “X” symbols and sets the demodulation RS to “NX”. Orthogonal multiplexing with symbols.
  • the user terminal 4a When the number of PUCCH symbols is changed from “N” to “N + M”, the user terminal 4a cyclically expands the OCC sequence applied to the UCI having the number of symbols “X”, and the UCI is orthogonalized by “X + P” symbols.
  • the OCC sequence that is multiplexed and applied to the demodulation RS with the number of symbols “N ⁇ X” is cyclically expanded, and the demodulation RS is orthogonally multiplexed with “N + M ⁇ (X + P)” symbols.
  • the user terminal 4a can orthogonally multiplex the UCI and the demodulation RS using an OCC sequence having a common sequence length.
  • the OCC generation unit 24 of the user terminal 4a generates an OCC sequence for orthogonally multiplexing a signal (for example, PUCCH) to be transmitted to the radio base station.
  • a signal for example, PUCCH
  • the cyclic extension unit 25 Cyclic extension so that the length is the same as the number of radio resources.
  • FIG. 8 is a diagram illustrating a block configuration example of the radio base station 50 according to the second embodiment.
  • the radio base station 50 includes a scheduler 51, an I / F unit 52, a transmission signal generation unit 53, an encoding / modulation unit 54, an OCC generation unit 55, a cyclic extension unit 56, A mapping unit 57, an RF transmission / reception unit 58, an antenna 59, a control unit 60, and a demodulation / decoding unit 61.
  • the scheduler 51 performs DL signal scheduling based on the communication quality (for example, CQI: Channel Quality Indicator) between the radio base station 50 and the user terminals 4a to 4c.
  • the scheduler 51 also schedules UL signals based on the communication quality between the radio base station 50 and the user terminals 4a to 4c.
  • the scheduler 51 determines the MCS and the like of the DL data signal and the UL data signal based on the communication quality between the radio base station 50 and the user terminals 4a to 4c.
  • the I / F unit 52 communicates with CC1 (see FIG. 1) that is a higher-level device. For example, the I / F unit 52 performs processing related to a layer higher than the physical layer or the MAC layer.
  • the transmission signal generation unit 53 generates a DL signal including a DL data signal, a DL control signal, and a demodulation RS.
  • the DL data signal included in the DL signal includes, for example, user data received from the CC 1 by the I / F unit 52.
  • the DL control signal included in the DL signal includes scheduling information including the radio resource allocation information of the DL data signal and the radio resource allocation information of the UL data signal generated by the scheduler 51.
  • the DL control signal included in the DL signal includes downlink control information (for example, DCI) including the MCS information generated by the scheduler 51.
  • the encoding / modulation unit 54 performs encoding processing and modulation processing on the DL signal output from the transmission signal generation unit 53 based on the MCS information generated by the scheduler 51.
  • the OCC generation unit 55 generates an OCC sequence for orthogonally multiplexing signals to be transmitted to the user terminals 4a to 4c. For example, the OCC generation unit 55 generates an OCC sequence for orthogonally multiplexing demodulation RSs. The OCC generation unit 55 generates, for example, a Walsh sequence as the OCC sequence.
  • the cyclic extension unit 56 when the sequence length of the OCC sequence generated by the OCC generation unit 55 is smaller than the number in the frequency direction of radio resources allocated to signals transmitted to the user terminals 4a to 4c The OCC sequence is cyclically extended so that the sequence length of the OCC sequence is the same as the number of radio resources in the frequency direction.
  • the cyclic extension unit 56 when the sequence length of the OCC sequence generated by the OCC generation unit 55 is smaller than the number in the frequency direction of the radio resource allocated to the demodulation RS, the frequency of the radio resource allocated to the demodulation RS
  • the OCC sequence is cyclically expanded so as to be the same as the number of directions.
  • the mapping unit 57 maps the DL signal output from the encoding / modulation unit 54 to a predetermined radio resource based on the DL scheduling information generated by the scheduler 51.
  • the mapping unit 57 performs mapping by multiplying the OCC sequence generated by the OCC generation unit 55 or the OCC sequence cyclically extended by the cyclic extension unit 56.
  • the RF transmission / reception unit 58 performs transmission processing such as up-conversion and amplification on the DL signal output from the mapping unit 57, and transmits the DL signal from the plurality of antennas 59 to the user terminals 4a to 4c. Further, the RF transceiver 58 performs reception processing such as amplification and down-conversion on UL signals received by the plurality of antennas 59 and transmitted by the user terminals 4a to 4c.
  • the control unit 60 Based on the UL scheduling information generated by the scheduler 51, the control unit 60 separates (demappings) the UL data signals and UL control signals of the user terminals 4a to 4c from the UL signal output from the RF transmission / reception unit 58. .
  • control unit 60 estimates the UL channel state based on the demodulation RS included in the demapped UL control signal.
  • the demodulation RS included in the UL control signal is orthogonally multiplexed by the OCC sequence, for example, as described in FIG. Therefore, the control unit 60 separates the demodulation RSs of the user terminals 4a to 4c that are orthogonally multiplexed by the despreading process.
  • the demodulation / decoding unit 61 demodulates and decodes the UL control signal and the UL data signal demapped by the control unit 60 based on the channel state estimated by the control unit 60.
  • the UL data signal demodulated and decoded by the demodulation / decoding unit 61 is transmitted to the CC 1 by the I / F unit 52, for example.
  • description of components for generating a signal waveform (for example, IFFT processing unit, CP adding unit, CP removing unit, FFT processing unit, etc.) is omitted. Further, in FIG. 8, description of a configuration unit (for example, a precoding unit or the like) for performing the MIMO process is omitted.
  • a DL demodulation RS (for example, DMRS) is arranged in front of a subframe in order to reduce processing time required for channel estimation and signal demodulation.
  • FIG. 9 is a diagram showing an example of arrangement of demodulation RSs.
  • FIG. 9 shows demodulation RS 71 mapped to radio resources.
  • the demodulation RS 71 is arranged in front of the subframe.
  • the demodulation RS 71 is mapped to the first symbol of the subframe.
  • the layer multiplexing number of the DL demodulation RS is considered as “8” layer in SU-MIMO and “12” layer as MU-MIMO.
  • multiplexing methods FDM (Frequency Division Multiplexing), TDM (Time Division Division Multiplexing), OCC, cyclic shift, and the like are being studied.
  • the number of radio resources allocated to the demodulation RS is limited by the sequence length of the OCC sequence, as in the description of FIG.
  • the radio base station 50 extends the OCC sequence and orthogonally multiplexes demodulation RSs having various numbers of radio resources. For example, when the number of radio resources of the demodulation RS is “6”, the radio base station 50 cyclically expands the Walsh sequence with the sequence length “4” to the sequence length “6” and demodulates with the radio resource number “6”. RS is orthogonally multiplexed.
  • FIG. 10 is a diagram for explaining an example of despreading processing.
  • FIG. 10 shows the cyclically expanded OCC 81.
  • the OCC 81 is a cyclic extension of an OCC sequence having a sequence length “4” to a sequence length “6”.
  • the radio base station 50 When the OCC having the sequence length “m” is extended to the sequence length “n”, the radio base station 50 (the control unit 60) shifts the window of the sequence length “m” “nm” times and reversely Spread.
  • the radio base station 50 despreads the window having the sequence length “4” by shifting twice. More specifically, when the radio base station 50 despreads the signals orthogonally multiplexed by the OCC 81, the radio base station 50 despreads in the windows W1, W2, and W3 shown in FIG. 10 (the number of shifts is 1 from W1 to W2). 2 times, once from W2 to W3).
  • the radio base station 50 can obtain three channel estimation values from, for example, three demodulation RSs obtained by despreading of the windows W1, W2, and W3, and by averaging these, noise is obtained. Reduction can be achieved.
  • control unit 29 of the user terminals 4a to 4c despreads the orthogonally multiplexed signals transmitted from the radio base station 50 by window shift.
  • FIG. 11 is a first diagram illustrating an example of orthogonal multiplexing of demodulation RSs in DL.
  • FIG. 11 shows an example in which demodulation RSs of layers (user terminals) L1 to L6 are mapped to radio resources.
  • the demodulating RS is orthogonally multiplexed in three layers by OCC.
  • FIG. 12 is a second diagram illustrating an example of orthogonal multiplexing of demodulation RSs in DL.
  • FIG. 12 shows RSs for demodulation of layers L1 to L6 shown in FIG.
  • FIG. 12 also shows OCCs 91a to 91c that orthogonally multiplex demodulation RSs in layers L1 to L6.
  • OCCs 91a to 91c are obtained by cyclically extending an OCC sequence having a sequence length “4” to a sequence length “6”.
  • the OCC 91a is multiplied by the demodulation RS (6RE) of the layer L1 indicated by a solid line circle in FIG.
  • the OCC 91b is multiplied by the demodulation RS (6RE) of the layer L2 indicated by the dotted circle in FIG.
  • the OCC 91c is multiplied by the demodulation RS (6RE) of the layer L5 indicated by the dot-dash line circle in FIG.
  • the OCC generation unit 55 since there is no OCC sequence having a sequence length “6”, the OCC generation unit 55 generates an OCC having a sequence length “4” smaller than “6”. Then, the cyclic extension unit 56 determines that the sequence length “4” of the OCC sequence generated by the OCC generation unit 55 is smaller than the number of radio resources “6” in the frequency direction allocated to the demodulation RS. The OCC sequence is cyclically extended so that the length “4” is the same as the number “6” of radio resources in the frequency direction.
  • the radio base station 50 can orthogonally multiplex the demodulation RSs of the layers L1, L2, and L5. Similarly, the radio base station 50 can orthogonally multiplex the layers L3, L4, and L6.
  • FIG. 13 is a diagram illustrating despreading of orthogonally multiplexed DL demodulation RSs.
  • FIG. 12 shows RSs for demodulation of layers L1 to L6 shown in FIG.
  • the demodulation RSs of layers L1 to L6 are orthogonally multiplexed by an OCC sequence having a sequence length “6” obtained by cyclically extending the sequence length “4”.
  • the layer L1 uses despreading to separate the demodulation RS for the own device surrounded by the solid line circle of the window W11 shown in FIG. Then, the layer L1 estimates the channel h1 L1 with the radio base station 50 from the demodulation RS for the own device separated by despreading.
  • the layer L1 uses despreading to separate the demodulation RS for the own device, which is surrounded by a solid circle in the window W12 shown in FIG. Then, the layer L1 estimates the channel h2 L1 with the radio base station 50 from the demodulation RS for the own device separated by despreading.
  • the layer L1 averages the channel h1 L1 obtained in the window W11 and the channel h2 L1 obtained in the window W12, and estimates the channel h L1 with the radio base station 50.
  • the layer L2 uses despreading to separate the demodulation RS for its own device, which is surrounded by a dotted circle in the window W11 shown in FIG. Then, the layer L2 estimates the channel h1 L2 with the radio base station 50 from the demodulation RS for the own device separated by despreading.
  • the layer L2 uses despreading to separate the demodulation RS for the own device surrounded by the dotted circle in the window W12 shown in FIG. Then, the layer L2 estimates the channel h2 L2 with the radio base station 50 from the demodulation RS for the own device separated by despreading.
  • the layer L2 averages the channel h1 L2 obtained in the window W11 and the channel h2 L2 obtained in the window W12, and estimates the channel h L2 with the radio base station 50.
  • the layer L5 uses despreading to separate the demodulating RS for the own device surrounded by a dot-and-dash line circle in the window W11 shown in FIG. Then, the layer L5 estimates the channel h1 L5 with the radio base station 50 from the demodulation RS for the own device separated by despreading.
  • the layer L5 uses despreading to separate the demodulating RS for the own device surrounded by the dot-and-dash line circle in the window W12 shown in FIG. Then, the layer L5 estimates the channel h2 L5 with the radio base station 50 from the demodulation RS for the own device separated by despreading.
  • the layer L5 averages the channel h1 L5 obtained in the window W11 and the channel h2 L5 obtained in the window W12, and estimates the channel h L5 with the radio base station 50.
  • the layers L1, L2, and L5 can separate the orthogonally multiplexed demodulation RSs.
  • noise can be reduced by averaging processing.
  • the layers L3, L4, and L6 can estimate the channel with the radio base station 50.
  • despreading is not performed by the window corresponding to the window W2 shown in FIG. That is, in FIG. 13, despreading in the window W21 is not performed. This is because the width of the window W21 is different from the widths of the windows W11 and W12 (the interval in the frequency direction of the demodulation RS is different), and there is a possibility that channel estimation accuracy imbalance may occur.
  • FIG. 14 is a first diagram illustrating an example in which cyclic extension is not applied.
  • the sequence length of the OCC sequence is limited, and therefore, in mapping the demodulation RS to the RE, the frequency direction interval is different between layers, and the tolerance to frequency selectivity is different. Is done.
  • the radio base station 50 generates an OCC sequence having a sequence length “2”, and orthogonally multiplexes demodulation RSs in units of 2RE. Specifically, the radio base station 50 orthogonally multiplexes the demodulation RS of the layer L1 indicated by the solid circle and the demodulation RS of the layer L5 indicated by the dotted circle with the OCC sequence having the sequence length “2”. . Also, the radio base station 50 orthogonally multiplexes the demodulation RS of layer L2 indicated by a solid circle and the demodulation RS of layer L5 indicated by a dotted circle with an OCC sequence having a sequence length “2”.
  • the radio base station 50 orthogonally multiplexes the demodulation RS of layer L1 indicated by a solid circle and the demodulation RS of layer L2 indicated by a dotted circle with an OCC sequence having a sequence length of “2”.
  • the other layers also multiplex demodulation RSs.
  • Layer L1 uses despreading to separate the demodulating RS for the own device surrounded by the upper solid circle of the three solid circles shown in FIG. Then, the layer L1 estimates the channel h1 L1 with the radio base station 50 from the demodulation RS for the own device separated by despreading.
  • the layer L1 uses despreading to separate the demodulation RS for the own device surrounded by the lower solid circle among the three solid circles shown in FIG. Then, the layer L1 estimates the channel h3 L1 with the radio base station 50 from the demodulation RS for the own device separated by despreading.
  • the layer L1 averages the channel h1 L1 obtained from the demodulation RS surrounded by the upper solid circle and the channel h3 L1 obtained from the demodulation RS surrounded by the lower solid circle, A channel h L1 with the radio base station 50 is estimated.
  • the layer L2 uses despreading to separate the demodulation RS for the own device, which is surrounded by the central solid circle among the three solid circles shown in FIG. Then, the layer L2 estimates the channel h2 L2 with the radio base station 50 from the demodulation RS for the own device separated by despreading.
  • the layer L2 uses despreading to separate the demodulation RS for the own device surrounded by the lower dotted circle of the three dotted circles shown in FIG. Then, the layer L2 estimates the channel h3 L2 with the radio base station 50 from the demodulation RS separated by despreading.
  • the layer L2 averages the channel h2 L2 obtained from the demodulation RS surrounded by the central solid circle and the channel h3 L2 obtained from the demodulation RS surrounded by the lower dotted circle, The channel h L2 with the radio base station 50 is estimated.
  • the layer L5 uses despreading to separate the demodulation RS for the own device surrounded by the upper dotted circle among the three dotted circles shown in FIG. Then, the layer L5 estimates the channel h1 L5 with the radio base station 50 from the demodulation RS for the own device separated by despreading.
  • the layer L5 uses despreading to separate the demodulating RS for the own device surrounded by the central dotted circle among the three dotted circles shown in FIG. Then, the layer L5 estimates the channel h2 L5 with the radio base station 50 from the demodulation RS separated by despreading.
  • the layer L5 then averages the channel h1 L5 obtained from the demodulation RS surrounded by the upper dotted circle and the channel h2 L5 obtained from the demodulation RS surrounded by the central dotted circle, The channel h L5 with the base station 50 is estimated.
  • the frequency direction interval of the RE to which the demodulation RS is assigned is different between layers, and thus the resistance to frequency selectivity may be different between layers, and channel estimation is performed between layers. Accuracy imbalance may occur.
  • FIG. 15 is a second diagram illustrating an example in which the cyclic extension is not applied.
  • the sequence length of the OCC sequence is restricted, and the number of orthogonal multiplexing is different between layers. In such a case, there may be a difference in channel estimation accuracy between layers.
  • the radio base station 50 sets the sequence length “2” to the demodulation RS of the layer L2 indicated by the upper dotted circle and the demodulation RS of the layer L5 indicated by the upper dashed-dotted circle. Orthogonally multiplex with the OCC sequence of
  • the radio base station 50 converts the demodulating RS of the layer L2 indicated by the lower dotted circle and the demodulating RS of the layer L5 indicated by the lower dashed-dotted circle to the OCC sequence having the sequence length “2”. Is orthogonally multiplexed.
  • the layer L1 estimates the channel h1 L1 and the channel h1 ′ L1 from the 2RE demodulation RS for its own device. Then, the layer L1 averages the channel h1 L1 and the channel h1 ′ L1, and estimates the channel hL1 between the radio base station 50.
  • the layer L2 uses despreading to separate the demodulation RS for its own device surrounded by a dotted circle on the upper side, and estimates the channel h2 L2 . Also, the layer L2 uses a despreading code to separate the demodulation RS for its own device surrounded by a dotted dotted circle on the lower side, and estimates the channel h3 L2 . Then, the layer L2 averages the channels h2 L2 and h3 L2 obtained from the demodulation RS, and estimates the channel h L2 with the radio base station 50.
  • the layer L5 uses despreading to separate the demodulation RS for the own device surrounded by a dot-dash circle on the upper side, and estimates the channel h2 L5 . Also, the layer L5 uses despreading to separate the demodulation RS for the own device surrounded by the lower dashed-dotted circle and estimates the channel h3 L5 . Then, the layer L5 averages the channels h2 L5 and h3 L5 obtained from the demodulation RS, and estimates the channel h L5 with the radio base station 50.
  • the OCC generation unit 55 of the radio base station 50 generates an OCC sequence for orthogonally multiplexing signals (for example, demodulation RSs) to be transmitted to the user terminals 4a to 4c.
  • the cyclic extension unit 56 when the sequence length of the OCC sequence generated by the OCC generation unit 55 is smaller than the number of radio resources allocated to the signals transmitted to the user terminals 4a to 4c in the frequency direction, Is cyclically expanded so as to be equal to the number of radio resources in the frequency direction.
  • the radio base station 50 can reduce signal pattern restrictions in signal multiplexing using an OCC sequence.
  • the cyclic extension unit 25 of the user terminal 4a cyclically extends the OCC sequence so that the sequence length of the OCC sequence is the same as the number of radio resources (number of symbols) in the time direction.
  • the OCC sequence may be cyclically extended so as to be the same as the number of radio resources in the frequency direction. That is, the cyclic extension unit 25, when the sequence length of the OCC sequence generated by the OCC generation unit 24 is smaller than the number of radio resources in the frequency direction allocated to the signal transmitted to the radio base station, The OCC sequence may be cyclically extended so that is equal to the number of radio resources in the frequency direction.
  • the cyclic extension unit 25 of the user terminal 4a may be cyclically extended like the cyclic extension unit 56 described in the second embodiment.
  • the cyclic extension unit 25 of the user terminal 4a may cyclically extend the OCC sequence so as to be the same as the number of radio resources in the time and frequency directions. That is, when the sequence length of the OCC sequence generated by the OCC generation unit 24 is smaller than the number of arbitrary radio resources in the time and frequency directions allocated to the signal transmitted to the radio base station, the cyclic extension unit 25 The OCC sequence may be cyclically extended so that the sequence length of the sequence is the same as the number of radio resources in the time and frequency directions.
  • the cyclic extension unit 25 of the user terminal 4a may be cyclically extended like the cyclic extension unit 56 described in the second embodiment.
  • the cyclic extension unit 56 of the radio base station 50 cyclically extends the OCC sequence so that the sequence length of the OCC sequence is the same as the number of radio resources in the frequency direction.
  • the OCC sequence may be cyclically extended so as to be the same as the number of radio resources in the direction. That is, when the sequence length of the OCC sequence generated by the OCC generation unit 55 is smaller than the number of radio resources in the time direction allocated to the signals transmitted to the user terminals 4a to 4c, the cyclic extension unit 56 The OCC sequence may be cyclically extended so that the sequence length is the same as the number of radio resources in the time direction.
  • the cyclic extension unit 56 of the radio base station 50 may be cyclically extended like the cyclic extension unit 25 described in the first embodiment.
  • the cyclic extension unit 56 of the radio base station 50 may cyclically extend the OCC sequence so as to be the same as the number of radio resources in the frequency and time directions. That is, when the sequence length of the OCC sequence generated by the OCC generation unit 55 is smaller than the number of radio resources in the frequency and time directions assigned to the signals transmitted to the user terminals 4a to 4c, the cyclic extension unit 56 The OCC sequence may be cyclically extended so that the sequence length of the sequence is the same as the number of radio resources in the frequency and time directions.
  • the cyclic extension unit 56 of the radio base station 50 may be cyclically extended like the cyclic extension unit 25 described in the first embodiment.
  • the OCC sequence is not limited to the Walsh sequence, and may be another OCC sequence such as a DFT (Discrete Fourier Transform) sequence or a pseudo orthogonal sequence.
  • the DMRS may also be called a demodulation RS.
  • PUCCH may be called an uplink control channel.
  • the OCC sequence may be referred to as an orthogonal spreading code, an orthogonal cover code, or an orthogonal code.
  • each functional block may be realized by one device physically and / or logically coupled, and two or more devices physically and / or logically separated may be directly and / or indirectly. (For example, wired and / or wireless) and may be realized by these plural devices.
  • a wireless base station, a user terminal, etc. in an embodiment of the present invention may function as a computer that performs processing of the wireless communication method of the present invention.
  • FIG. 16 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention.
  • the above-described radio base station and user terminal may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.
  • the term “apparatus” can be read as a circuit, a device, a unit, or the like.
  • the hardware configurations of the radio base station and the user terminal may be configured to include one or a plurality of devices illustrated in the figure, or may be configured not to include some devices.
  • processor 1001 may be implemented by one or more chips.
  • Each function in the radio base station and the user terminal reads predetermined software (program) on hardware such as the processor 1001 and the memory 1002 so that the processor 1001 performs computation and performs communication by the communication device 1004 or memory. This is realized by controlling data reading and / or writing in the storage 1003 and the storage 1003.
  • the processor 1001 controls the entire computer by operating an operating system, for example.
  • the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.
  • CPU central processing unit
  • All or some of the functions of the respective units of the radio base station and the user terminal may be realized by the processor 1001.
  • the processor 1001 reads a program (program code), software module, or data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
  • a program program code
  • the program a program that causes a computer to execute at least a part of the operations described in the above embodiments is used.
  • the functional blocks constituting the radio base station and the user terminal may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be realized similarly for other functional blocks. Also good.
  • the above-described various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001.
  • the processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.
  • the memory 1002 is a computer-readable recording medium and includes at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. May be.
  • the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
  • the memory 1002 can store a program (program code), a software module, and the like that can be executed to implement the wireless communication method according to the embodiment of the present invention.
  • the storage 1003 is a computer-readable recording medium such as an optical disc such as a CD-ROM (Compact Disc ROM), a hard disc drive, a flexible disc, a magneto-optical disc (eg, a compact disc, a digital versatile disc, a Blu-ray). (Registered trademark) disk, smart card, flash memory (for example, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like.
  • the storage 1003 may be referred to as an auxiliary storage device.
  • the storage medium described above may be, for example, a database, server, or other suitable medium including the memory 1002 and / or the storage 1003.
  • the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like.
  • the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside.
  • the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside.
  • the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
  • each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
  • the bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.
  • the radio base station and the user terminal include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA). And a part or all of each functional block may be realized by the hardware.
  • the processor 1001 may be implemented by at least one of these hardware.
  • information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or a combination thereof.
  • RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.
  • Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-Advanced
  • SUPER 3G IMT-Advanced
  • 4G 5G
  • FRA Full Radio Access
  • W-CDMA Wideband
  • GSM registered trademark
  • CDMA2000 Code Division Multiple Access 2000
  • UMB User Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 UWB (Ultra-WideBand)
  • Bluetooth Registered trademark
  • a system using another appropriate system and / or a next generation system extended based on the system may be applied.
  • the specific operation assumed to be performed by the base station (radio base station) in this specification may be performed by the upper node in some cases.
  • various operations performed for communication with a terminal may be performed by the base station and / or other network nodes other than the base station (e.g., It is obvious that this can be performed by MME (Mobility Management Entity) or S-GW (Serving Gateway).
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • Information, signals, and the like can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.
  • Input / output information and the like may be stored in a specific location (for example, a memory) or may be managed by a management table. Input / output information and the like can be overwritten, updated, or additionally written. The output information or the like may be deleted. The input information or the like may be transmitted to another device.
  • the determination may be performed by a value represented by 1 bit (0 or 1), may be performed by a true / false value (Boolean: true or false), or may be performed by comparing numerical values (for example, a predetermined value) Comparison with the value).
  • software, instructions, etc. may be transmitted / received via a transmission medium.
  • software may use websites, servers, or other devices using wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave.
  • wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave.
  • DSL digital subscriber line
  • wireless technology such as infrared, wireless and microwave.
  • Information, signal Information, signals, etc. described herein may be represented using any of a variety of different technologies.
  • data, commands, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these May be represented by a combination of
  • the channel and / or symbol may be a signal.
  • the signal may be a message.
  • the component carrier (CC) may be called a carrier frequency, a cell, or the like.
  • radio resource may be indicated by an index.
  • a base station can accommodate one or more (eg, three) cells (also referred to as sectors). When the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, indoor small base station RRH: Remote Radio Head) can also provide communication services.
  • the term “cell” or “sector” refers to part or all of the coverage area of a base station and / or base station subsystem that provides communication services in this coverage. Further, the terms “base station”, “eNB”, “cell”, and “sector” may be used interchangeably herein.
  • a base station may also be referred to in terms such as a fixed station, NodeB, eNodeB (eNB), gNodeB (gNB), access point, femtocell, and small cell.
  • a user terminal is a mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile by a person skilled in the art It may also be referred to as a terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, UE (User Equipment), or some other appropriate terminology.
  • determining may encompass a wide variety of actions. “Judgment” and “determination” are, for example, judgment, calculation, calculation, processing, derivation, investigating, looking up (eg, table , Searching in a database or another data structure), considering ascertaining as “determining”, “deciding”, and the like.
  • determination and “determination” include receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (accessing) (e.g., accessing data in a memory) may be considered as “determined” or "determined”.
  • determination and “decision” means that “resolving”, “selecting”, “choosing”, “establishing”, and “comparing” are regarded as “determining” and “deciding”. May be included. In other words, “determination” and “determination” may include considering some operation as “determination” and “determination”.
  • connection means any direct or indirect connection or coupling between two or more elements and It can include the presence of one or more intermediate elements between two “connected” or “coupled” elements.
  • the coupling or connection between the elements may be physical, logical, or a combination thereof.
  • the two elements are radio frequency by using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples
  • electromagnetic energy such as electromagnetic energy having a wavelength in the region, microwave region, and light (both visible and invisible) region, it can be considered to be “connected” or “coupled” to each other.
  • the reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot or a known signal depending on the standard applied.
  • RS Reference Signal
  • the phrase “based on” does not mean “based only on”, unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
  • the radio frame may be composed of one or a plurality of frames in the time domain.
  • One or more frames in the time domain may be referred to as subframes, time units, etc.
  • a subframe may further be composed of one or more slots in the time domain.
  • the slot may be further configured with one or a plurality of symbols (OFDM (Orthogonal-Frequency-Division-Multiplexing) symbol, SC-FDMA (Single-Carrier-Frequency-Division-Multiple-Access) symbol, etc.) in the time domain.
  • OFDM Orthogonal-Frequency-Division-Multiplexing
  • SC-FDMA Single-Carrier-Frequency-Division-Multiple-Access
  • the radio frame, subframe, slot, and symbol all represent a time unit when transmitting a signal. Radio frames, subframes, slots, and symbols may be called differently corresponding to each.
  • the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each mobile station) to each mobile station.
  • the minimum time unit of scheduling may be called TTI (Transmission Time Interval).
  • one subframe may be called a TTI
  • a plurality of consecutive subframes may be called a TTI
  • one slot may be called a TTI
  • the resource unit is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
  • one or a plurality of symbols may be included, and one slot, one subframe, or a length of 1 TTI may be included.
  • One TTI and one subframe may each be composed of one or a plurality of resource units.
  • the resource unit may also be called a resource block (RB: Resource Block), a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, a scheduling unit, a frequency unit, or a subband.
  • the resource unit may be composed of one or a plurality of REs.
  • 1 RE may be any resource (for example, the smallest resource unit) smaller than a resource unit serving as a resource allocation unit, and is not limited to the name RE.
  • the structure of the radio frame described above is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, the number of symbols and resource blocks included in the slots, and the subframes included in the resource block
  • the number of carriers can be variously changed.
  • notification of predetermined information is not limited to explicitly performed, but is performed implicitly (for example, notification of the predetermined information is not performed). Also good.
  • One embodiment of the present invention is useful for a mobile communication system.

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Abstract

L'invention concerne un terminal utilisateur (4a) qui réduit des contraintes de motif de signal dans un multiplex de signal à l'aide de codes de couverture orthogonaux. Un terminal utilisateur (4a), qui transmet des signaux à une station de base radio, comprend : une unité de génération (24) qui génère des codes de couverture orthogonaux pour un multiplexage orthogonal des signaux ; et une unité d'expansion (25) qui, si la longueur de séquence des codes de couverture orthogonaux est inférieure au nombre de ressources radio allouées aux signaux, réalise alors l'expansion cyclique les codes de couverture orthogonaux de telle sorte que la longueur de séquence est la même que le nombre de ressources radio.
PCT/JP2017/011551 2017-03-22 2017-03-22 Terminal utilisateur, station de base radio et système de radiocommunication WO2018173176A1 (fr)

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PCT/JP2017/011551 WO2018173176A1 (fr) 2017-03-22 2017-03-22 Terminal utilisateur, station de base radio et système de radiocommunication

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001251211A (ja) * 2000-03-07 2001-09-14 Matsushita Electric Ind Co Ltd 直接スペクトラム拡散通信方式における拡散／逆拡散装置及び直接スペクトラム拡散通信方式における拡散／逆拡散方法
JP2004128783A (ja) * 2002-10-01 2004-04-22 Nippon Telegr & Teleph Corp <Ntt> マルチキャリア−ｃｄｍａ変調方式用送信装置およびマルチキャリア−ｃｄｍａ変調方式用受信装置

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JP2001251211A (ja) * 2000-03-07 2001-09-14 Matsushita Electric Ind Co Ltd 直接スペクトラム拡散通信方式における拡散／逆拡散装置及び直接スペクトラム拡散通信方式における拡散／逆拡散方法
JP2004128783A (ja) * 2002-10-01 2004-04-22 Nippon Telegr & Teleph Corp <Ntt> マルチキャリア−ｃｄｍａ変調方式用送信装置およびマルチキャリア−ｃｄｍａ変調方式用受信装置

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