WO2019049351A1 - Équipement utilisateur et procédé de communication sans fil - Google Patents

Équipement utilisateur et procédé de communication sans fil Download PDF

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Publication number
WO2019049351A1
WO2019049351A1 PCT/JP2017/032593 JP2017032593W WO2019049351A1 WO 2019049351 A1 WO2019049351 A1 WO 2019049351A1 JP 2017032593 W JP2017032593 W JP 2017032593W WO 2019049351 A1 WO2019049351 A1 WO 2019049351A1
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WIPO (PCT)
Prior art keywords
user terminal
data signal
resource
control signal
radio
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Ceased
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PCT/JP2017/032593
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English (en)
Japanese (ja)
Inventor
英之 諸我
和晃 武田
一樹 武田
聡 永田
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NTT Docomo Inc
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NTT Docomo Inc
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Priority to CN201780095869.0A priority Critical patent/CN111213423B/zh
Priority to PCT/JP2017/032593 priority patent/WO2019049351A1/fr
Publication of WO2019049351A1 publication Critical patent/WO2019049351A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the present invention relates to a user terminal and a wireless communication method in a next-generation mobile communication system.
  • LTE Long Term Evolution
  • UMTS Universal Mobile Telecommunications System
  • Non-Patent Document 1 the successor system of LTE is also considered for the purpose of the further broadbandization and speeding-up from LTE.
  • successor systems of LTE for example, LTE-A (LTE-Advanced), FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G + (5G plus), New-RAT (Radio Access Technology), etc. There is something called.
  • an object of this invention is to provide the technique which suppresses interference with the uplink data signal and uplink control signal which a different user terminal transmits.
  • a user terminal is a user terminal that performs wireless communication with a wireless base station, and a receiving unit that receives resource information indicating a wireless resource of an uplink control signal transmitted by another user terminal, and an uplink data signal, It has a mapping part which maps to the radio
  • FIG. 1 is a diagram showing a configuration example of a wireless communication system according to a first embodiment. It is a figure explaining the example of the bandwidth of UL of a user terminal. It is a figure explaining the example of interference with UL control signal and UL data signal. It is a figure explaining the example of allocation of UL data signal of a user terminal. It is a figure explaining the operation example of a radio
  • FIG. 7 is a diagram showing an example of bands allocated to a UL data signal and a UL control signal. It is a figure explaining the operation example of the radio
  • FIG. 1 is a diagram showing a configuration example of a wireless communication system according to the first embodiment.
  • the wireless communication system includes a wireless base station 1 and user terminals 2 and 3.
  • the wireless base station 1 is a wireless base station to which the New-RAT is applied.
  • the wireless base station 1 has, for example, tens to hundreds of antennas, and performs wireless communication with the user terminals 2 and 3 in a high frequency band (for example, a frequency band of 5 GHz or more).
  • the radio base station 1 controls the amplitude and phase of the signal using a plurality of antennas, forms a beam having directivity, and transmits / receives signals to / from the user terminals 2 and 3.
  • the user terminals 2 and 3 are, for example, a mobile phone, a smartphone, or a tablet terminal.
  • the radio base station 1 is connected to a core network (not shown).
  • the core network may include, for example, a higher-level device such as a mobility management entity (MME), a serving gateway (S-GW), or a Pakcet data network gateway (P-GW).
  • MME mobility management entity
  • S-GW serving gateway
  • P-GW Pakcet data network gateway
  • the radio base station 1 controls, for example, an overhanging station performing radio communication with the user terminals 2 and 3 and an overhanging station so as to correspond to a C-RAN (Centralized Radio Access Network) or an advanced C-RAN. It may be separated into BBU (BaseBand processing unit). Moreover, although only two user terminals 2 and 3 are shown in FIG. 1, three or more may exist in this embodiment.
  • C-RAN Centralized Radio Access Network
  • BBU BaseBand processing unit
  • FIG. 2 is a diagram for explaining an example of UL (Up Link) bandwidths of the user terminals 2 and 3.
  • a bandwidth W1a illustrated in FIG. 2 indicates a transmittable bandwidth in the UL of the user terminal 2.
  • the bandwidth W1b indicates the transmittable bandwidth of the user terminal 3 in the UL.
  • 5G UL it is considered to transmit data in a wide band for high speed and high capacity. Further, in the 5G UL, it is assumed that the communicable bandwidth differs between the user terminals 2 and 3. For example, as shown in bandwidths W1a and W1b, it is assumed that the transmittable bandwidths in the UL of the user terminals 2 and 3 are different.
  • FIG. 3 is a diagram for explaining an example of interference between a UL control signal and a UL data signal.
  • the bandwidth W2a illustrated in FIG. 3 indicates an example of the bandwidth allocated to the UL data signal of the user terminal 2.
  • the UL data signal may be, for example, a PUSCH (Physical Uplink Shared Channel).
  • the bandwidth W2b represents an example of the bandwidth allocated to the UL control signal of the user terminal 3.
  • the UL control signal may be, for example, a PUCCH (Physical Uplink Control Channel).
  • the bandwidth W1b indicated by a dotted line indicates a transmittable bandwidth in the UL of the user terminal 3 described in FIG.
  • UL data signals and UL control signals are allocated to continuous bands, for example, as indicated by bandwidths W2a and W2b.
  • UL data signal and UL control signal are allocated to one continuous band or plural continuous bands.
  • the communicable bandwidth in the 5G UL is different for each of the user terminals 2 and 3.
  • the UL data signal is transmitted in a wide band for high speed and large capacity. Therefore, there is a possibility that the UL data signal transmitted by the user terminal 2 and the UL control signal transmitted by the user terminal 3 may interfere (collide).
  • the bandwidth W2a allocated to the UL data signal of the user terminal 2 is wider than the transmittable bandwidth W1b of the user terminal 3. Then, the UL control signal of the user terminal 3 is transmitted using the bandwidth W2b within the bandwidth W1b. Therefore, the bandwidth W2a of the UL data signal transmitted by the user terminal 2 may overlap with the bandwidth W2b allocated for the transmission of the UL control signal of the user terminal 3. Therefore, there is a possibility that the UL data signal transmitted by the user terminal 2 may interfere with the UL control signal transmitted by the user terminal 3.
  • bands at both ends of a system band are used to transmit a UL control signal.
  • the UL control signal is transmitted in the bands at both ends of the bandwidth W1b shown in FIG. Even if the bands at both ends of the bandwidth W1b are used, the band overlaps with the bandwidth W2a of the UL data signal of the user terminal 2. Therefore, the UL control signal of the user terminal 3 may interfere with the UL data signal of the user terminal 2.
  • the user terminal 2 does not assign a UL data signal to the band (radio resource) of the UL control signal transmitted by another user terminal 3.
  • FIG. 4 is a diagram for explaining an example of allocation of UL data signals of the user terminal 2.
  • the bandwidth W3a illustrated in FIG. 4 illustrates an example of the bandwidth allocated to the UL data signal of the user terminal 2.
  • the bandwidth W3 b indicates an example of the bandwidth allocated to the UL control signal of the user terminal 3.
  • the user terminal 2 transmitting the UL data signal does not assign the UL data signal to a band overlapping the bandwidth of the UL control signal of the user terminal 3 indicated by the bandwidth W3b. Therefore, interference is suppressed for the UL data signal of the user terminal 2 and the UL control signal of the user terminal 3.
  • FIG. 5 is a diagram for explaining an operation example of the wireless communication system.
  • the process S1 shown in FIG. 5 shows an example of the process of the radio base station 1 shown in FIG.
  • the process S2 shows an example of the process of the user terminals 2 and 3.
  • the radio base station 1 periodically notifies resource information of the UL control signal to the user terminals 2 and 3 (S1a).
  • the resource information includes information on a band for the user terminals 2 and 3 to transmit a UL control signal.
  • the resource information may include the information of the bandwidth W3b illustrated in FIG.
  • the resource information (information of the band of the UL control signal) is common (same) in the user terminals 2 and 3.
  • the user terminals 2 and 3 assign the UL control signal to the band included in the received resource information, and transmit it to the radio base station 1. That is, the user terminals 2 and 3 assign UL control signals to the band notified from the radio base station 1 and transmit the band to the radio base station 1.
  • the radio base station 1 notifies resource information of a UL control signal to the user terminals 2 and 3, for example, at intervals of several tens of msec.
  • the radio base station 1 may change the band included in the resource information of the UL control signal.
  • the radio base station 1 uses the DL control information to notify the user terminals 2 and 3 of information indicating whether another user terminal transmits a UL control signal (S1 b).
  • the DL control information may be, for example, DCI (Downlink Control Information).
  • DCI Downlink Control Information
  • the user terminal 3 transmits a UL control signal and the user terminal 2 transmits a UL data signal
  • another user terminal 3 transmits a UL control signal to DCI transmitted to the user terminal 2
  • the user terminal 2 transmits a UL control signal and the user terminal 3 transmits a UL data signal
  • another user terminal 2 is UL in DCI transmitted to the user terminal 3 Information is included to indicate that the control signal is to be transmitted.
  • the information which shows whether another user terminal transmits UL control signal may be notified to the user terminals 2 and 3 using the predetermined bit (for example, 1 bit) of DCI, for example.
  • the user terminals 2 and 3 receive the resource information notified from the radio base station 1, and the band of the UL control signal included in the received resource information may be transmitted to, for example, a mapping unit described later (for example, see FIG. 7).
  • Set (S2a) For example, see FIG. 7
  • the mapping unit When transmitting the UL control signal, the mapping unit maps the UL control signal to the set band. For example, when the resource information notified from the wireless base station 1 includes the bandwidth information of the bandwidth W3b shown in FIG. 4, the mapping units of the user terminals 2 and 3 have the bandwidth W3b shown in FIG. Map the UL control signal to
  • the user terminal 2 transmits a UL data signal to the radio base station 1 and the user terminal 2 transmits a UL control signal to the radio base station 1 will be described.
  • the user terminal 2 determines whether or not another user terminal 3 transmits a UL control signal from the DL control information transmitted from the radio base station 1 (S2 b). For example, the user terminal 2 refers to a predetermined 1 bit of DCI, and determines whether another user terminal 3 transmits a UL control signal.
  • the user terminal 2 When another user terminal 3 transmits a UL control signal, the user terminal 2 does not assign a UL data signal to resource information (a band of the UL control signal) notified from the radio base station 1 (S2 c). For example, as shown by the bandwidth W3a in FIG. 4, the user terminal 2 does not assign a UL data signal to a band overlapping with the bandwidth W3b to which the UL control signal is assigned.
  • the user terminals 2 and 3 can transmit interference to the radio base station 1 by suppressing the interference between the UL data signal and the UL control signal transmitted by another user terminal.
  • the reverse is also true. That is, even when the user terminal 3 transmits a UL data signal to the radio base station 1 and the user terminal 2 transmits a UL control signal to the radio base station 1, the same process as described above is performed.
  • FIG. 6 is a diagram showing an example of a block configuration of the wireless base station 1.
  • the radio base station 1 includes a control unit (scheduler) 21, a transmission signal generation unit 22, an encoding / modulation unit 23, a mapping unit 24, an RF transmission unit 25, and an antenna 26. ,have.
  • the control unit 21 performs scheduling of the DL data signal, the DL control signal, and the like.
  • the DL data signal may be, for example, a physical downlink shared channel (PDSCH).
  • the DL control signal may be, for example, a PDCCH (Physical Downlink Control Channel).
  • control unit 21 schedules resource information of a UL control signal to be notified to the user terminals 2 and 3.
  • the resource information may be notified to the user terminals 2 and 3 by, for example, RRC (Radio Resource Control), S1 connection setting, MIB (Master Information Block), SIB (System Information Block), RA response, Paging message, etc. .
  • RRC Radio Resource Control
  • MIB Master Information Block
  • SIB System Information Block
  • RA response resource information
  • Paging message etc.
  • the user terminals 2 and 3 may use resource information determined in advance according to the specifications, or may use resource information set last.
  • the transmission signal generation unit 22 generates a DL signal (including DL data signal, DL control signal, resource information of UL control signal, and the like).
  • the DL control signal includes DCI and the like including scheduling information generated by the control unit 21.
  • the transmission signal generation unit 22 outputs the generated DL signal to the coding / modulation unit 23.
  • the coding / modulation unit 23 performs coding processing and modulation processing on the DL signal.
  • the coding / modulation unit 23 outputs the DL signal subjected to the coding / modulation processing to the mapping unit 24.
  • the mapping unit 24 maps the DL signal output from the encoding / modulation unit 23 to a radio resource based on the scheduling of the control unit 21.
  • the RF transmission unit 25 performs transmission processing such as up-conversion and amplification on the DL signal output from the mapping unit 24 and transmits the DL signal from the plurality of antennas 26 to the user terminal 2.
  • the radio base station 1 has a reception processing unit that processes UL data signals and UL control signals transmitted from the user terminals 2 and 3.
  • the radio base station 1 includes a demapping unit, a channel estimation unit, and a demodulation / decoding unit.
  • the description of components for example, an IFFT processing unit, a CP adding unit, a CP removing unit, an FFT processing unit, and the like
  • components for example, a precoding unit or the like
  • FIG. 7 is a diagram showing an example of the block configuration of the user terminal 2.
  • the user terminal 2 includes an antenna 31, an RF transmission / reception unit 32, a demapping unit 33, a channel estimation unit 34, a demodulation / decoding unit 35, a transmission signal generation unit 36, and encoding.
  • the modulation unit 37 and the mapping unit 38 are included.
  • the user terminal 3 also has a block configuration example similar to that of FIG. 7, and the description thereof is omitted.
  • the RF transmitting and receiving unit 32 receives the DL signal transmitted by the wireless base station 1 and received by the one or more antennas 31.
  • the RF transmission / reception unit 32 performs reception processing such as amplification and down conversion on the input DL signal.
  • the RF transmission / reception unit 32 outputs the DL signal subjected to reception processing to the demapping unit 33.
  • the demapping unit 33 separates (demaps) the DL control signal from the DL signal output from the RF transmission / reception unit 32. In addition, the demapping unit 33 generates a DL data signal addressed to the own machine from the DL signal output from the RF transmission / reception unit 32 based on the scheduling information (DL radio resource allocation information) output from the demodulation / decoding unit 35. Separate. Further, the demapping unit 33 separates the resource information of the UL control signal from the DL signal output from the RF transmission / reception unit 32.
  • the channel estimation unit 34 receives the DL control signal demapped by the demapping unit 33.
  • the channel estimation unit 34 estimates the channel state of DL based on the reference signal included in the input DL control signal.
  • the channel estimation unit 34 outputs the estimated DL channel state to the demodulation and decoding unit 35.
  • the demodulation and decoding unit 35 receives the DL channel state estimated by the channel estimation unit 34. Further, the demodulation / decoding unit 35 receives the DL control signal demapped by the demapping unit 33, the DL data signal, the resource, and the like. The demodulation and decoding unit 35 demodulates and decodes the resource information of the DL control signal, the DL data signal, and the UL control signal demapped by the demapping unit 33 based on the channel state estimated by the channel estimation unit 34. Do.
  • the transmission signal generation unit 36 generates a UL signal including a UL data signal and a UL control signal.
  • the UL signal output from the transmission signal generation unit 36 is input to the encoding / modulation unit 37. Further, the modulation and coding scheme (MCS) information of UL output from the demodulation and decoding unit 35 is input to the encoding and modulation unit 37.
  • the coding / modulation unit 37 performs coding processing and modulation processing on the UL signal output from the transmission signal generation unit 36 based on the input UL MCS information.
  • the coding / modulation unit 37 performs puncture processing for the UL data signal when the timing for transmitting the UL data signal to the radio base station 1 and the timing for the other user terminal 3 to transmit the UL control signal overlap with each other. Perform one of the coding rate adjustment processing.
  • the puncture processing and the coding rate adjustment processing will be described below.
  • the mapping unit 38 receives the UL signal that has been subjected to the encoding process and the modulation process by the encoding and modulation unit 37.
  • the mapping unit 38 also receives the UL scheduling information demodulated and decoded by the demodulation and decoding unit 35.
  • the mapping unit 38 maps the UL signal input from the encoding / modulation unit 37 to a predetermined radio resource (UL resource) based on the UL scheduling information input from the demodulation / decoding unit 35.
  • the mapping unit 38 also receives (sets) resource information of the UL control signal that has been demodulated and decoded by the demodulation and decoding unit 35. When mapping the UL control signal to the radio resource, the mapping unit 38 maps the UL control signal to the radio resource based on the set resource information.
  • the mapping unit 38 maps the UL data signal to a radio resource of a band to which the UL control signal is mapped. do not do.
  • the user terminal 2 may transmit a UL signal to the radio base station 1 by DFT-s-OFDM.
  • the DFT unit is inserted at the front stage of the mapping unit 38, and the IFFT unit is inserted at the rear stage of the mapping unit 38.
  • the user terminal 2 may transmit a UL signal to the radio base station 1 by OFDM.
  • the mapping unit 38 maps UL signals to continuous radio resources of one or more bands.
  • the user terminal 2 may have a configuration unit (for example, a precoding unit or the like) for performing MIMO processing.
  • FIG. 8 is a diagram for explaining an example of puncturing processing.
  • the bandwidths W4a and W4b illustrated in FIG. 8 indicate the bandwidths allocated to the UL data signal of the user terminal 2.
  • a bandwidth W4c indicated by a dotted line indicates a bandwidth allocated to the UL control signal.
  • the user terminal 3 transmits a UL control signal using the bandwidth W4c.
  • the bandwidths W4a and W4b correspond to, for example, 48 RBs of radio resources, and the bandwidth W4c corresponds to, for example, 2 RBs of radio resources.
  • the encoding / modulation unit 37 generates a UL data signal with a size of 50 RB in accordance with the MCS information.
  • the mapping unit 38 maps the UL data signal generated by the coding / modulation unit 37 to a radio resource. At this time, the mapping unit punctures 2 RBs allocated to the UL control signal from the UL data signal to be mapped. In the case of FIG. 8, the mapping unit 38 punctures RBs (2 RBs) at a position corresponding to the bandwidth W 4 c from the mapped 50 RBs UL data signal. That is, the mapping unit 38 maps UL data signals to radio resources so as to avoid a band in which other user terminals 3 map UL control signals.
  • the user terminal 2 can suppress the interference between the UL data signal and the UL control signal of the user terminal 3, and can suppress the error rate decrease of the UL control signal and the error rate decrease of the UL data signal.
  • the encoding / modulation unit 37 may puncture RBs (2 RBs) at positions corresponding to the bandwidth W 4 c from the generated 50 RBs UL data signals.
  • FIG. 9 is a diagram for explaining an example of the adjustment of the coding rate.
  • the same components as those in FIG. 8 are denoted by the same reference numerals.
  • the bandwidths W4a and W4b correspond to, for example, 48 RBs of radio resources
  • the bandwidth W4c corresponds to, for example, 2 RBs of radio resources.
  • the encoding / modulation unit 37 When the UL data signal D3 is generated, the encoding / modulation unit 37 performs the code of the UL data signal D3 such that the UL data signal corresponding to the bandwidth W4c (2 RBs) is included in the UL data signal D3. Adjust the conversion rate. For example, the encoding / modulation unit 37 increases the coding rate of the UL data signal D3.
  • the mapping unit 38 maps the UL data signal D3 whose coding rate has been adjusted, to a radio resource. At this time, the mapping unit 38 does not map the UL data signal D3 to the radio resource to which the UL control signal is mapped. That is, the mapping unit 38 maps UL data signals to radio resources so as to avoid a band in which other user terminals 3 map UL control signals.
  • the user terminal 2 can suppress the interference between the UL data signal and the UL control signal of the user terminal 3, and can suppress the error rate decrease of the UL control signal and the error rate decrease of the UL data signal.
  • the encoding / modulation unit 37 may switch between the puncturing process and the adjustment process of the coding rate in accordance with external control. Further, the coding / modulation unit 37 may have only one of the functions of puncturing processing and coding rate adjustment processing.
  • FIG. 10 is a flowchart showing an example of the UL data signal transmission operation of the user terminal 2. It is assumed that the user terminal 2 has received resource information periodically notified from the radio base station 1.
  • the control unit (not shown in FIG. 7) of the user terminal 2 determines whether there is a UL data signal to be transmitted to the radio base station 1 (step S11). If the control unit determines that there is no UL data signal to be transmitted to the radio base station 1 (“No” in S11), the processing of the flowchart is ended.
  • control unit determines whether or not another user terminal 3 transmits a UL control signal (Ste S12). For example, the control unit determines whether another user terminal 3 transmits a UL control signal with reference to a predetermined bit of DCI.
  • control unit determines that the other user terminal 3 does not transmit the UL control signal (“No” in step S12)
  • the control unit shifts the process to step S14.
  • the user terminal 2 When the process shifts to step S14, the user terminal 2 performs a normal transmission process (step S14).
  • the encoding / modulation unit 37 encodes / modulates the UL data signal according to the MCS information
  • the mapping unit 38 maps the UL data signal to a radio resource based on the UL scheduling information.
  • the UL data signal mapped to the radio resource is transmitted to the radio base station 1 via the RF transmission / reception unit 32.
  • step S12 when the control unit determines that the other user terminal 3 transmits the UL control signal in step S12 ("Yes" in step S12), the control unit shifts the process to step S13.
  • the coding and modulation unit 37 codes and modulates a UL data signal.
  • the mapping unit 38 maps the encoded / modulated UL data signal to a radio resource. At this time, the mapping unit 38 punctures the signal corresponding to the radio resource to which the UL control signal is assigned (step S13).
  • the coding / modulation unit 37 increases the coding rate such that the UL data signal is mapped to the radio resource excluding the non-resources for the UL control signal. Then, the mapping unit 38 maps the UL data signal encoded and modulated by the encoding and modulation unit 37 on a radio resource. At this time, the mapping unit 38 does not map the UL data signal to the radio resource allocated to the UL control signal (step S13). The RF transmission / reception unit 32 transmits the UL data signal mapped to the radio resource to the radio base station 1 (step S13).
  • the RF transmission / reception unit 32 of the user terminal 2 receives the resource information of the UL control signal transmitted by the other user terminal 3.
  • the mapping unit 38 maps the UL data signal to a radio resource, and the RF transmission / reception unit 32 transmits the UL data signal to the radio base station 1 by radio. Then, when the DCI includes information indicating transmission of a UL control signal of another user terminal 3, the mapping unit 38 determines that the UL data signal has a band different from the band of the UL control signal indicated by the resource information. Map to the radio resource of By this process, the user terminal 2 can suppress the interference between the UL data signal and the UL control signal.
  • the radio base station 1 notifies the user terminals 2 and 3 of the resource information of the UL control signal by RRC, MIB, SIB, RA response, Paging message or the like.
  • the radio base station 1 notifies the resource information of the UL control signal to the user terminals 2 and 3 using the DL control information.
  • the radio base station 1 transmits the UL data signal to the user terminal 2 and transmits the UL control signal to another user terminal 3. Assign discontinuous radio resources.
  • the user terminal 2 receives discontinuous radio resource allocation information, it determines that another user terminal 3 transmits a UL control signal, and performs either puncturing processing or coding rate adjustment processing.
  • UL data signal is transmitted to the radio base station 1.
  • the user terminal 2 receives continuous radio resource allocation information, it determines that the other user terminal 3 does not transmit the UL control signal, and does not perform puncturing processing and coding rate adjustment processing, and thus UL A data signal is transmitted to the wireless base station 1.
  • FIG. 11 is a diagram for explaining an operation example of the wireless communication system according to the second embodiment.
  • the process S21 shown in FIG. 11 shows an example of the process of the radio base station 1 shown in FIG.
  • Processing S22 shows an example of processing of the user terminals 2 and 3.
  • the resource information (information of the band of the UL control signal) is individually set in each of the user terminals 2 and 3. That is, the resource information may be different for each of the user terminals 2 and 3 and may be the same. The resource information may be changed, for example, each time a DCI is sent.
  • the user terminal 2 transmits a UL data signal and the user terminal 3 transmits a UL control signal will be described.
  • the radio base station 1 When the user terminal 3 does not transmit a UL control signal, the radio base station 1 assigns a radio resource with a continuous band to the UL data signal of the user terminal 2 (S21). Also, when the user terminal 3 transmits a UL control signal, the radio base station 1 assigns a radio resource in which the band is not continuous to the UL data signal of the user terminal 2 (S21). Radio resource allocation information may be notified, for example, by DCI.
  • the user terminal 2 transmits a UL data signal to the radio base station 1 and the user terminal 3 transmits a UL control signal to the radio base station 1 will be described.
  • the user terminal 2 determines that the other user terminal 3 does not transmit the UL control signal when allocation of radio resources of the UL data signal notified by DCI is continuous, and performs puncturing processing or coding rate adjustment processing Do not do (S22).
  • the user terminal 2 determines that another user terminal 3 transmits a UL control signal, and performs puncturing processing or adjustment of the coding rate A process is performed (S22).
  • FIG. 12 is a diagram showing an example of bands assigned to the UL data signal and the UL control signal.
  • a bandwidth W5a illustrated in FIG. 12 indicates the bandwidth of the user terminal 2 assigned to the UL data signal.
  • Information of the bandwidth W5a is notified from the radio base station 1 to the user terminal 2 by, for example, DCI.
  • the bandwidth W5b indicates the bandwidth of the user terminal 3 assigned to the UL control signal.
  • the information of the bandwidth W5b is notified from the radio base station 1 to the user terminal 3 by DCI, for example.
  • the allocation of the radio resource of the UL data signal of the user terminal 2 is discontinuous as shown by the bandwidth W5a It becomes.
  • the UL data signal of the user terminal 2 is discontinuously allocated to radio resources so as not to interfere with the UL control signal of the user terminal 3.
  • the encoding / modulation unit 37 When the UL data signal of the user terminal 2 is discontinuously allocated to the radio resource, the encoding / modulation unit 37 performs either the puncturing process or the encoding rate adjustment process as described in FIG. 8 and FIG. 9. Do one or the other. Then, the mapping unit 38 maps the UL data signal to a radio resource of a band different from the band indicated by the resource information.
  • resource information is individually set in the user terminals 2 and 3 and is included in DCI including uplink scheduling information.
  • the scheduling information included in the DCI includes information indicating that the radio resource of the UL data signal is discontinuous
  • the mapping unit 38 separates the UL data signal from the band indicated by the resource information. Map to band radio resources. By this process, the user terminal 2 can suppress the interference between the UL data signal and the UL control signal. Also, UL control information can be allocated to radio resources more flexibly.
  • the user terminal 2 transmitting the UL data signal is assigned the transmission timing of the UL data signal to the other user terminal 3 even when the other user terminal 3 does not transmit the UL control signal.
  • the UL data signal is mapped to a radio resource different from the radio resource indicated by the resource information.
  • FIG. 13 is a diagram for explaining an operation example of the wireless communication system according to the third embodiment. An example of the radio resource of the user terminal 2 is shown in FIG.
  • Radio resources A1 to A3 shown in FIG. 13 indicate radio resources to which UL control signals can be allocated. That is, when transmitting the UL control signal, the user terminal 3 allocates and transmits the UL control signal to the radio resources A1 to A3. The user terminal 3 does not transmit the UL control signal if there is no UL control signal to be transmitted to the radio base station 1 at the timing of the radio resources A1 to A3.
  • the radio base station 1 transmits UL control signal resource information to the user terminals 2 and 3 by RRC, S1 connection setup, MIB, SIB, RA response, Paging message, etc., for example. Notify Therefore, the user terminal 2 can recognize the radio resources A1 to A3 of the UL control signal transmitted by the other user terminal 3. Since the resource information is common to the user terminals 2 and 3, the user terminal 2 also transmits the UL control signal using the radio resources A1 to A3. Further, when the resource information is not notified, the user terminals 2 and 3 may use resource information determined in advance according to the specifications, or may use resource information set last.
  • the mapping unit 38 of the user terminal 2 transmits the UL data signal at the transmission timing even when the other user terminal 3 does not transmit the UL control signal at the transmission timing of the radio resources A1 to A3 allocated by the resource information.
  • the UL data signal is mapped to a radio resource of a band different from the band indicated by the resource information.
  • the other user terminal 3 transmits the UL control signal in the radio resource A2 and does not transmit the UL control signal in the radio resources A1 and A3.
  • the UL control signal is not transmitted at transmission timing T1 at which the transmission timing overlaps with the radio resource A1, but the mapping unit 38 allocates UL data signals to radio resources other than the radio resource A1.
  • the mapping unit 38 allocates UL data signals to radio resources other than the radio resource A2.
  • the UL control signal is not transmitted, but the mapping unit 38 allocates the UL data signal to radio resources other than the radio resource A3.
  • the coding / modulation unit 37 performs either puncturing processing or coding rate adjustment processing at transmission timings T1 to T3. By this process, the user terminal 2 can suppress the decrease in throughput of the UL data signal at the transmission timings T1 to T3.
  • the coding / modulation unit 37 does not perform puncturing processing or coding rate adjustment processing at timings other than the transmission timings T1 to T3.
  • the mapping unit 38 of the user terminal 2 is a transmission timing in which the transmission timing of the UL data signal is assigned to the other user terminal 3 even when the other user terminal 3 does not transmit the UL control signal. And the UL data signal is mapped to a radio resource different from the radio resource indicated by the resource information. By this process, the user terminal 2 can suppress the interference between the UL data signal and the UL control signal.
  • the resource information is notified to the user terminals 2 and 3 by RRC, MIB, SIB or the like, but may be notified to the user terminals 2 and 3 by DCI or the like.
  • the radio resources of the UL data signal are reduced by the bandwidth of the UL control signal when the UL control signal is transmitted.
  • the user terminal 2 transmitting the UL data signal raises the power spectral density of the radio resource to which the UL data signal is allocated.
  • the RF transmission / reception unit 32 of the user terminal 2 determines, for example, the transmission power of the UL data signal based on the following equation (1).
  • P PUSCH is the transmission power of the RF transmission / reception unit 32.
  • M PUSCH is the number of RBs allocated to UL data signals transmitted by radio.
  • P O — PUSCH is the target received power when the propagation loss is zero.
  • ⁇ is a weighting factor of fractional TPC (TPC: Transmission Power Control).
  • PL is a measurement value of propagation loss.
  • ⁇ TF (TF (i)) is an offset at timing TF (i) depending on MCS (modulation and coding scheme).
  • f (i) is a correction value at timing i by TPC or Extended TPC.
  • the number of RBs allocated to the UL data signal is 50 RBs. If puncturing was 2 RB (UL control signal to the RB number assigned 2 RB), RF transceiver unit 32, the M PUSCH if 50 RB, it is possible to increase the power spectral density of the UL data signal.
  • the RF transmission / reception unit 32 may correct the transmission power of the UL data signal represented by equation (1) based on the number of RBs allocated to the UL data signal and the number of RBs allocated to the UL control signal. .
  • FIG. 14 is a table showing an example of the relationship between the number of RBs assigned to the UL data signal, the number of RBs assigned to the UL control signal, and the correction value.
  • the number of RBs allocated to the UL data signal is 25, and the number of RBs allocated to the UL control signal is 2.
  • the correction value X is 0.3 according to the table shown in FIG.
  • Equation (2) has a correction term X with respect to equation (1).
  • the correction term X can be obtained from the table shown in FIG.
  • the table shown in FIG. 14 may be stored in a storage unit (not shown in FIG. 7) of the user terminal 2 or notified by S1 connection setting, MIB, SIB, RA response, Paging message, etc. May be
  • the RF transmission / reception unit 32 can perform power control in consideration of an Adjacent Channel Leakage Ratio (ACLR) by introducing the correction term X.
  • ACLR Adjacent Channel Leakage Ratio
  • the RF transmission / reception unit 32 uses the number of RBs of the UL data signal before the RB is reduced to Determine transmit power. Through this process, the user terminal 2 improves the throughput.
  • the RF transmission / reception unit 32 corrects the determined transmission power based on the number of RBs allocated to the UL data signal and the number of RBs allocated to the UL control signal. By this processing, the RF transmission and reception unit 32 can perform power control in consideration of ACLR.
  • the above transmission power control can be applied to the first to fourth embodiments.
  • each functional block (components) are realized by any combination of hardware and / or software.
  • the implementation means of each functional block is not particularly limited. That is, each functional block may be realized by one physically and / or logically coupled device, or directly and / or indirectly two or more physically and / or logically separated devices. It may be connected by (for example, wired and / or wireless) and realized by the plurality of devices.
  • each device of the wireless communication system in one embodiment of the present invention may function as a computer that performs the processing of the present invention.
  • FIG. 15 is a diagram showing an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention.
  • Each of the above-described devices 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 “device” can be read as a circuit, a device, a unit, or the like.
  • the hardware configuration of the radio base station and the user terminal may be configured to include one or more of the devices illustrated in the figure, or may be configured without some of the devices.
  • processor 1001 may be implemented by one or more chips.
  • Each function in each device causes the processor 1001 to perform an operation by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, and the communication by the communication device 1004 or the memory 1002 and the storage 1003. This is realized by controlling the reading and / or writing of data in
  • the processor 1001 operates, for example, an operating system to control the entire computer.
  • the processor 1001 may be configured by a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.
  • CPU Central Processing Unit
  • the above block example may be realized by the processor 1001.
  • the processor 1001 reads a program (program code), a software module or data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processing according to these.
  • a program a program that causes a computer to execute at least a part of the operations described in the above embodiments is used.
  • at least a part of functional blocks constituting each device 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.
  • the various processes described above have been described to be executed by one processor 1001, but may be executed simultaneously or sequentially by two or more processors 1001.
  • the processor 1001 may be implemented by one or more chips.
  • the program may be transmitted from the network via a telecommunication line.
  • the memory 1002 is a computer readable recording medium, and includes, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). It may be done.
  • 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 each device according to an embodiment of the present invention.
  • the storage 1003 is a computer readable recording medium, and for example, 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 A (registered trademark) disk, a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like may be used.
  • the storage 1003 may be called an auxiliary storage device.
  • the above-mentioned storage medium may be, for example, a database including the memory 1002 and / or the storage 1003, a server or any other suitable medium.
  • the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also called, for example, 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, and the like) that receives 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 be integrated (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 by a single bus or may be configured by different buses among the devices.
  • each device includes 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).
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • PLD programmable logic device
  • FPGA field programmable gate array
  • notification of information is not limited to the aspect / embodiment described herein, and may be performed by other methods.
  • notification of information may be physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) 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 (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like.
  • Each aspect / embodiment described in the present specification is LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-Wide Band),
  • the present invention may be applied to a system utilizing Bluetooth (registered trademark), other appropriate systems, and / or an advanced next-generation system based on these.
  • the specific operation supposed to be performed by the base station (radio base station) in this specification may be performed by the upper node in some cases.
  • the various operations performed for communication with the terminals may be the base station and / or other network nodes other than the base station (eg, It is obvious that this may be performed by, but not limited to, MME (Mobility Management Entity) or S-GW (Serving Gateway).
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • Information, signals, etc. may be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input and output may be performed via a plurality of network nodes.
  • the input / output information or the like may be stored in a specific place (for example, a memory) or may be managed by a management table. Information to be input or output may be overwritten, updated or added. The output information etc. may be deleted. The input information or the like may be transmitted to another device.
  • the determination may be performed by a value (0 or 1) represented by one bit, may be performed by a boolean value (Boolean: true or false), or may be compared with a numerical value (for example, a predetermined value). Comparison with the value).
  • Software may be called software, firmware, middleware, microcode, hardware description language, or any other name, and may be instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules. Should be interpreted broadly to mean applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc.
  • software, instructions, etc. may be sent and received via a transmission medium.
  • software may use a wireline technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or a website, server or other using wireless technology such as infrared, radio and microwave When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission medium.
  • wireline technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or a website, server or other using wireless technology such as infrared, radio and microwave
  • Information, signal The information, signals, etc. described herein may be represented using any of a variety of different techniques.
  • data, instructions, commands, information, signals, bits, symbols, chips etc may be voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any of these May be represented by a combination of
  • the channels and / or symbols may be signals.
  • the signal may be a message.
  • the component carrier (CC) may be called a carrier frequency, a cell or the like.
  • radio resources may be indexed.
  • a base station can accommodate one or more (e.g., three) cells (also called sectors). If the base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small base station RRH for indoor use: Remote Communication service can also be provided by Radio Head.
  • the terms "cell” or “sector” refer to a part or all of the coverage area of a base station and / or a base station subsystem serving communication services in this coverage.
  • base station “eNB”, “cell” and “sector” may be used interchangeably herein.
  • a base station may be called in terms of a fixed station (Node station), NodeB, eNodeB (eNB), access point (access point), femtocell, small cell, and the like.
  • the user terminal may be a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote communication device, a mobile subscriber station, an access terminal, a mobile terminal by a person skilled in the art It may also be called a terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, a UE (User Equipment), or some other suitable term.
  • determining may encompass a wide variety of operations.
  • “Judgment”, “decision” are, for example, judging, calculating, calculating, processing, processing, deriving, investigating, looking up (for example, a table) (Searching in a database or another data structure), ascertaining may be regarded as “decision”, “decision”, etc.
  • “determination” and “determination” are receiving (e.g. receiving information), transmitting (e.g. transmitting information), input (input), output (output), access (accessing) (for example, accessing data in a memory) may be regarded as “judged” or “decided”.
  • connection means any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled”.
  • the coupling or connection between elements may be physical, logical or a combination thereof.
  • the two elements are by using one or more wires, cables and / or printed electrical connections, and radio frequency as some non-limiting and non-exclusive examples. It can be considered “connected” or “coupled” to one another by using electromagnetic energy such as electromagnetic energy having wavelengths in the region, microwave region and light (both visible and invisible) regions.
  • the reference signal may be abbreviated as RS (Reference Signal), and may be called a pilot (Pilot) according to the applied standard.
  • the correction RS may be called TRS (Tracking RS), PC-RS (Phase Compensation RS), PTRS (Phase Tracking RS), or Additional RS.
  • the demodulation RS and the correction RS may be different names corresponding to each other.
  • the demodulation RS and the correction RS may be defined by the same name (for example, the demodulation RS).
  • the phrase “based on” does not mean “based only on,” unless expressly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
  • a radio frame may be comprised of one or more frames in the time domain.
  • One or more frames in the time domain may be referred to as subframes, time units, and so on.
  • a subframe may be further comprised of one or more slots in the time domain.
  • the slot may be further configured with one or more symbols (such as orthogonal frequency division multiplexing (OFDM) symbols, single carrier-frequency division multiple access (SC-FDMA) symbols, etc.) in the time domain.
  • OFDM orthogonal frequency division multiplexing
  • SC-FDMA single carrier-frequency division multiple access
  • a radio frame, a subframe, a slot, and a symbol all represent time units in transmitting a signal.
  • a radio frame, a subframe, a slot, and a symbol may be another name corresponding to each.
  • the base station performs scheduling to assign radio resources (frequency bandwidth usable in each mobile station, transmission power, etc.) to each mobile station.
  • the minimum time unit of scheduling may be called a 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
  • a resource unit is a resource allocation unit in time domain and frequency domain, and may include one or more consecutive subcarriers in frequency domain.
  • the time domain of a resource unit may include one or more symbols, and may be one slot, one subframe, or one TTI long.
  • One TTI and one subframe may be configured of one or more resource units, respectively.
  • resource units may be referred to as resource blocks (RBs), physical resource blocks (PRBs: physical RBs), PRB pairs, RB pairs, scheduling units, frequency units, and subbands.
  • a resource unit may be configured of one or more REs.
  • 1 RE may be a resource of a unit smaller than the resource unit serving as a resource allocation unit (for example, the smallest resource unit), and is not limited to the name of RE.
  • the above-described radio frame structure 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 sub The number of carriers can vary.
  • notification of predetermined information is not limited to what is explicitly performed, but is performed by implicit (for example, not notifying of the predetermined information) It is also good.
  • One aspect of the present invention is useful for a mobile communication system.

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

Abstract

La présente invention supprime des interférences entre des signaux de données de liaison montante et des signaux de commande de liaison montante, émis par différents équipements utilisateurs. Un équipement utilisateur, qui communique sans fil avec une station de base sans fil, comprend : une unité de réception, qui reçoit des informations de ressource qui indiquent une ressource sans fil d'un signal de commande de liaison montante émis par un autre équipement utilisateur ; une unité de mappage, qui mappe un signal de données de liaison montante vers une ressource sans fil qui est séparée de la ressource sans fil indiquée par les informations de ressource ; et une unité d'émission, qui émet le signal de données de liaison montante mappé avec la ressource sans fil séparée.
PCT/JP2017/032593 2017-09-08 2017-09-08 Équipement utilisateur et procédé de communication sans fil Ceased WO2019049351A1 (fr)

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