JP6462751B2 - User terminal, radio base station, and radio communication method - Google Patents

Description

  The present invention relates to a user terminal, a radio base station, and a radio communication method in a next generation mobile communication system.

  In the UMTS (Universal Mobile Telecommunication System) network, Long Term Evolution (LTE) has been specified for the purpose of higher data rate and low delay (Non-patent Document 1). LTE Advanced (also referred to as LTE Rel. 10, 11 or 12) has been specified for the purpose of further broadbandization and speedup from LTE (also referred to as LTE Rel. 8), and is also referred to as a successor system (LTE Rel. 13 etc.). ) Is also being considered.

  LTE Rel. The system bandwidth of 10/11 is LTE Rel. It includes at least one component carrier (CC) having eight system bands as one unit. Collecting a plurality of component carriers in this way to increase the bandwidth is called carrier aggregation (CA).

  In addition, LTE Rel. In LTE of 8 to 12, the specification was performed on the assumption that exclusive operation is performed in a frequency band licensed by a business operator, that is, a license band. For example, 800 MHz, 2 GHz, or 1.7 GHz is used as the license band.

  Rel. In LTE 13 or later, operation in a license-free frequency band, that is, an unlicensed band is also considered as a target. As the unlicensed band, for example, the same 2.4 GHz or 5 GHz band as Wi-Fi is used. Rel. 13 LTE considers carrier aggregation (LAA: License-Assisted Access) between licensed and unlicensed bands, but may also be considered for dual connectivity and unlicensed band standalone in the future. There is.

3GPP TS 36.300 Rel.8 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2”

  In the carrier aggregation (CA) of the existing system (LTE Rel. 10-12), the maximum number of component carriers (CC) that can be set per user terminal is limited to five. LTE Rel. In CA 13 or later, in order to realize further band expansion, it has been studied to expand the number of CCs that can be set per user terminal to 6 or more.

  By the way, in the existing system, uplink control information (UCI) including acknowledgment information (HARQ-ACK: Hybrid Automatic Repeat reQuest-ACKnowledgement) for the downlink signal of each CC is an uplink control signal (uplink control channel ( (PUCCH: Physical Uplink Control Channel)) or an uplink data signal (uplink shared channel (PUSCH)).

  When the uplink control signal (PUCCH) is used, the user terminal includes the delivery confirmation information for the downlink signal of each CC using an existing format (for example, PUCCH format 1a / 1b / 3, etc.) premised on 5 CC or less. Send UCI. However, it is assumed that the existing format is not suitable for transmitting UCI including acknowledgment information of many CCs, such as when the number of CCs is expanded to 6 or more. For this reason, a new format of the uplink control signal (PUCCH) suitable when the number of CCs is expanded to 6 or more is desired.

  The present invention has been made in view of such a point, and a user who can transmit an uplink control signal using a format suitable when the number of component carriers (CC) that can be set per user terminal is expanded from the existing system. An object is to provide a terminal, a radio base station, and a radio communication method.

One aspect of the user terminal of the present invention, a transmission unit for transmitting uplink control information (UCI) by using an uplink control channel, on the basis of the spreading factor of the uplink control channel, at least the send product及beauty of the UCI anda control unit for controlling one, the control unit, the information indicating at least two of the spreading factor, and securing at least one symbol number and location of the demodulation reference signal in a slot It is characterized by that.

  According to the present invention, it is possible to transmit an uplink control signal using a format suitable for a case where the number of component carriers (CC) that can be set per user terminal is expanded from the existing system.

It is explanatory drawing of a carrier aggregation. It is a figure which shows the structural example of PUCCH format 3. It is a figure which shows the 1st structural example of a new PUCCH format. It is a figure which shows the 2nd structural example of a new PUCCH format. It is a figure which shows the 3rd structural example of a new PUCCH format. It is a figure which shows the structural example of the new PUCCH format which concerns on a 1st aspect. It is a figure which shows the relationship between the spreading | diffusion rate which concerns on a 1st aspect, and a payload. It is a figure which shows the signal generation example which concerns on a 1st aspect. It is a figure which shows the example of a setting of the new PUCCH format which concerns on a 1st aspect. It is a figure which shows the structural example of the new PUCCH format which concerns on a 2nd aspect. It is a figure which shows the relationship between the number of PRB which concerns on a 2nd aspect, and a payload. It is a figure which shows the example of mapping which concerns on a 2nd aspect. It is a figure which shows an example of schematic structure of the radio | wireless communications system which concerns on this embodiment. It is a figure which shows an example of the whole structure of the wireless base station which concerns on this embodiment. It is a figure which shows an example of a function structure of the wireless base station which concerns on this embodiment. It is a figure which shows an example of the whole structure of the user terminal which concerns on this embodiment. It is a figure which shows an example of a function structure of the user terminal which concerns on this embodiment.

  FIG. 1 is an explanatory diagram of carrier aggregation (CA). As shown in FIG. In CA up to 12, LTE Rel. A maximum of five (CC # 1 to CC # 5) component carriers (CC) each having eight system bands as a unit are bundled. That is, LTE Rel. In the carrier aggregation up to 12, the number of CCs that can be set per user terminal (UE: User Equipment) is limited to a maximum of five.

  Meanwhile, LTE Rel. With 13 carrier aggregations, it is considered to bundle more than 6 CCs to further expand the bandwidth. That is, LTE Rel. In 13 CAs, the enhancement of the number of CCs (cells) that can be set per user terminal to 6 or more (CA enhancement) is being studied. For example, as shown in FIG. 1, when 32 CCs (CC # 1 to CC # 32) are bundled, it is possible to secure a maximum band of 640 MHz.

  As described above, it is expected to realize more flexible and high-speed wireless communication by expanding the number of CCs that can be set per user terminal. Further, such an extension of the number of CCs is effective in widening the bandwidth by CA (LAA: License-Assisted Access) between the license band and the unlicensed band. For example, when 5 CCs (= 100 MHz) of the license band and 15 CCs (= 300 MHz) of the unlicensed band are bundled, a 400 MHz band can be secured.

  On the other hand, when the number of CCs that can be set in the user terminal is expanded to 6 or more (for example, 32), the transmission method (for example, format or transmission power) of the existing system (LTE Rel. 10-12) is changed. It becomes difficult to apply as it is.

  For example, in the existing system (LTE Rel. 10-12), the user terminal transmits uplink control information (UCI) using an uplink control channel (PUCCH). Here, UCI includes acknowledgment information (HARQ-ACK) for downlink shared channel (PDSCH) of each CC, channel state information (CSI: Channel State Information) indicating the channel state, and uplink shared channel. And (PUSCH) scheduling request (SR).

  In existing systems, PUCCH formats 1 / 1a / 1b, 2 / 2a / 2b, and 3 (collectively referred to as existing PUCCH formats) are supported as PUCCH formats (hereinafter referred to as PUCCH formats). PUCCH format 1 is used for transmission of SR. 1b / 3 based on PUCCH format 1a / 1b / channel selection is used for transmission of HARQ-ACK of 5 CC or less. PUCCH format 2 / 2a / 2b is used for transmission of CSI of a specific CC. PUCCH format 2a / 2b may be used for transmission of HARQ-ACK in addition to CSI of a specific CC. PUCCH format 3 may be used for transmission of SR and / or CSI in addition to HARQ-ACK.

  FIG. 2 is a diagram illustrating a configuration example of PUCCH format 3 having a maximum payload among existing PUCCH formats. In PUCCH format 3, it is possible to transmit UCI up to 10 bits in FDD and up to 22 bits in TDD (for example, up to 5 CC HARQ-ACK). As shown in FIG. 2, the PUCCH format 3 includes two demodulation reference signals (DMRS) and five SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols per slot. Each symbol (for example, SC-FDMA symbol) in each slot is mapped with the same bit string, and is multiplied by a spreading code (orthogonal code, also called OCC: Orthogonal Cover Code) to multiplex a plurality of user terminals.

  In addition, cyclic shifts (also referred to as cyclic shifts or CSs) different among user terminals are applied to each DMRS in each slot. By applying orthogonal codes and cyclic shifts, it is possible to perform code division multiplexing (CDM: Code Division Multiplexing) on up to five PUCCH formats 3 on the same resource (PRB). For example, HARQ bit sequences can be orthogonally multiplexed using different spreading codes (OCC) for each user terminal, and DMRSs can be orthogonally multiplexed using different CS sequences for each user terminal.

  However, when the number of CCs that can be set per user terminal is expanded to 6 or more (for example, 32), the PUCCH format 3 cannot transmit UCI for all scheduled CCs due to a lack of payload. Is assumed.

  For example, in FDD, when transmitting 2 codewords (transport block) HARQ-ACK for 32 CCs, a PUCCH format capable of transmitting 64 bits is required. Also, in TDD, when transmitting 2 codewords of HARQ-ACK for 32 CCs and 4 downlink subframes correspond to 1 uplink subframe, PUCCH capable of transmitting 128 bits (when spatial bundling is applied) or 256 bits Formatting is required.

  Therefore, a PUCCH format (hereinafter referred to as a new PUCCH format) in which the number of bits (payload, capacity) that can be transmitted is larger than that of the existing PUCCH format has been studied so that UCI (for example, HARQ-ACK) of 6 CC or more can be transmitted. Yes. The new PUCCH format may be called PUCCH format 4, large-capacity PUCCH format, extended PUCCH format, new format, or the like.

  A configuration example of the new PUCCH format will be described with reference to FIGS. 3-5 is merely an example, and the location and number of DMRSs, the number of PRBs, and a multiplexing method of a plurality of user terminals are not limited to those illustrated in FIG. 3-5. A reference signal (not shown) (for example, a sounding reference signal (SRS)) may be arranged. In addition, at least two of the configuration examples described with reference to FIGS. 3-5 may be used in combination.

  FIG. 3 is a diagram illustrating a first configuration example of the new PUCCH format. As shown in FIG. 3, the position and number of DMRSs arranged in the new PUCCH format may be the same as or different from PUCCH format 3. When the number of DMRSs arranged in the new PUCCH format is increased, channel estimation can be performed with high accuracy even in a low SINR (Signal-to-Interference plus Noise power Ratio) environment or a high-speed moving environment. On the other hand, when the number of DMRSs is reduced, the payload (the number of bits that can be transmitted) can be increased, so that a higher coding gain can be easily obtained.

  For example, as shown in FIG. 3A, in the new PUCCH format, DMRSs may be arranged in the second and sixth symbols of each slot, as in PUCCH format 3 (see FIG. 2). By increasing the number of DMRS symbols in each slot, the channel estimation accuracy can be increased, and the influence of a high-speed moving environment and frequency offset can be reduced. Alternatively, as shown in FIG. 3B, in the new PUCCH format, DMRS may be arranged in the fourth symbol of each slot. By increasing the number of non-DMRS symbols in each slot, the coding rate can be reduced, and reception quality can be improved even in an environment where the signal-to-interference noise power ratio (SINR) is low.

  FIG. 4 is a diagram illustrating a second configuration example (number of PRBs) of the new PUCCH format. As shown in FIG. 4, the number of frequency resources (also referred to as physical resource blocks (PRB), resource blocks, etc., hereinafter referred to as PRB) used in the new PUCCH format may be the same as in PUCCH format 3, It may be larger than PUCCH format 3. If the number of PRBs used in the new PUCCH format is increased, the payload per PRB is reduced, so that the coding gain can be increased while the overhead is increased.

  For example, as shown in FIG. 4A, in the new PUCCH format, 1 PRB per slot may be used as in PUCCH format 3 (see FIG. 2), and frequency hopping may be applied between slots. Alternatively, as shown in FIG. 4B, in the new PUCCH format, a plurality of PRBs (3 PRBs in FIG. 4) may be used per slot, and frequency hopping may be applied between the slots. When the number of PRBs is small, PUCCH overhead in the uplink system band can be reduced, and transmission power can be concentrated in a small band, so that a larger coverage can be realized. When the number of PRBs is large, the amount of radio resources with respect to the amount of transmission information becomes large, so that the coding rate can be reduced and reception quality can be improved even in an environment where SINR is low.

  FIG. 5 is a diagram illustrating a third configuration example of the new PUCCH format. As shown in FIG. 5, in the new PUCCH format, a plurality of user terminals may be code division multiplexed (CDM), frequency division multiplexed (FDM) or / and time division multiplexed (TDM). Division Multiplexing). In the case of code division multiplexing, a plurality of user terminals can be accommodated in the same PRB, but the payload per user terminal becomes small and it is difficult to obtain a coding gain.

  For example, as shown in FIG. 5A, in the new PUCCH format, a plurality of user terminals may be code division multiplexed. Specifically, similarly to PUCCH format 3 (see FIG. 2), UCIs of a plurality of user terminals are orthogonally multiplexed using different spreading codes (OCC: Orthogonal Cover Code) for each user terminal, and are different for each user terminal. You may orthogonally multiplex DMRS of a some user terminal by applying cyclic shift (CS: Cyclic Shift). When a new PUCCH format is designed on the assumption that CDM is performed, the PUCCH payload per user terminal is restricted according to the multiplexing capacity of the CDM, but many user terminals simultaneously transmit the new PUCCH format. The overhead in case can be suppressed.

  Alternatively, as shown in FIG. 5B, in the new PUCCH format, a plurality of user terminals may be frequency division multiplexed. Specifically, UCI and DMRS of a plurality of user terminals may be mapped to different PRBs. When a new PUCCH format is designed on the assumption of FDM (when CDM is not assumed), the PUCCH payload per user can be increased, so the coding rate per user terminal is lowered and the SINR is low. The reception quality can be improved even in the environment.

  The new PUCCH format as described above is expected to have an optimum configuration depending on the state of the radio communication system (for example, the number of user terminals accommodated in the radio base station, coverage, mobility characteristics, scenario, operation mode, etc.). . For example, when a large number of user terminals are to be accommodated in a radio base station, it is desirable to reduce overhead by code division multiplexing a plurality of user terminals (see FIG. 5A). On the other hand, when the coverage is to be widened, it is desirable to frequency multiplex a plurality of user terminals using a plurality of PRBs (see FIG. 5B). In addition, it is desirable to arrange a large number of DMRSs (see FIG. 3A) when improving mobility characteristics. Also, when trying to increase the payload, it is desirable to decrease the spreading factor or increase the number of PRBs (FIG. 4B).

  Thus, it is assumed that the optimal configuration of the new PUCCH format varies depending on the state of the wireless communication system. Therefore, the present inventors have conceived that, as a new PUCCH format, for example, a format (unified format) in which a configuration such as a spreading factor (SF) and the number of PRBs can be set as parameters is used. Invented. By using the integrated format, the new PUCCH format can be set to an optimum configuration according to the state of the wireless communication system.

  Hereinafter, an embodiment of the present invention will be described in detail. In the present embodiment, the user terminal can control the configuration of the new PUCCH format (configurable). In the following, the user terminal sets at least one of the spreading factor (first mode) used in the new PUCCH format and the number of PRBs (number of resource blocks) (second mode) constituting the new PUCCH format. The case will be described. However, the configuration of the new PUCCH format set as parameters is not limited to the spreading factor and the number of PRBs, and other configurations (for example, the number of DM-RSs, etc.) may be set as parameters.

(First aspect)
In the first aspect, a radio communication method using a new PUCCH format in which a spreading factor (SF) can be set will be described. Note that the spreading factor may be referred to as an orthogonal code length or the like.

  FIG. 6 is an explanatory diagram of an example of a new PUCCH format in which the spreading factor can be set. 6 illustrates an example in which the DMRS per slot is one symbol, the number and positions of DMRSs are not limited to those illustrated in FIG. In FIG. 6, SRS may be arranged in the final symbol of the new PUCCH format. 6 illustrates an example in which the number of PRBs is 1. However, the number of PRBs may be 2 or more.

  As shown in FIG. 6A, when the spreading factor is 1, 12 types of encoded bit sequences (6 types of encoded bit sequences per slot) are mapped in the new PUCCH format. Also, as shown in FIG. 6B, when the spreading factor is 2, six types of encoded bit sequences (three types of encoded bit sequences per slot) are mapped. Also, as shown in FIG. 6C, when the spreading factor is 3, four types of encoded bit sequences (two types of encoded bit sequences per slot) are mapped.

  In FIGS. 6A-6C, the same hatched UCI in the first half slot and the second half slot may not be the same UCI. That is, the UCI transmitted in the first half slot and the second half slot may be the same bit sequence or different bit sequences. Hereinafter, a case where different bit sequences are accommodated in the first half slot and the second half slot will be described as an example.

  FIG. 7 shows the spreading factor used in the new PUCCH format, the payload of the new PUCCH format (the number of bits of the encoded bit sequence that can be accommodated), and the maximum number of UCI bits that can be accommodated in the new PUCCH format (hereinafter referred to as the maximum UCI). It is a figure which shows the relationship with (it is called the number of bits). In FIG. 7, it is assumed that 1 DMRS is arranged per slot (that is, a case where an encoded bit sequence can be arranged in 6 symbols per slot), but is not limited thereto. Further, in FIG. 7, it is assumed that the coding rate is 12/48 and an 8-bit CRC is added, but the present invention is not limited to this.

  As described above, when the spreading factor is 1, 12 types of encoded bit sequences are mapped in the new PUCCH format. In this case, the new PUCCH format can accommodate an encoded bit sequence of 12 symbols × 12 types (6 types per slot) × 2 (QPSK) = 288 bits. The number of user terminals that can be code division multiplexed (CDM) is one. When the coding rate is 12/48 and 8-bit CRC is added, the maximum number of UCI bits is 64 bits.

  When the spreading factor is 2, as shown in FIG. 6B, 6 types of encoded bit sequences are mapped in the new PUCCH format. In this case, the new PUCCH format can accommodate a code bit string of 12 symbols × 6 types (3 types per slot) × 2 (QPSK) = 144 bits. The number of user terminals capable of CDM is two. When the coding rate is 12/48 and 8-bit CRC is added, the maximum number of UCI bits is 28 bits.

  When the spreading factor is 3, as shown in FIG. 6C, four types of encoded bit sequences are mapped in the new PUCCH format. In this case, the new PUCCH format can accommodate a code bit string of 12 symbols × 4 types (2 types per slot) × 2 (QPSK) = 96 bits. The number of user terminals capable of CDM is three. When the coding rate is 12/48 and 8-bit CRC is added, the maximum number of UCI bits is 16 bits.

  Thus, when the spreading factor of the new PUCCH format is reduced, the payload increases while the number of user terminals capable of CDM decreases. Therefore, the radio base station designates a spreading factor according to the state (for example, the number of accommodated user terminals, the number of UCI bits, etc.), and transmits information indicating the spreading factor to the user terminal. When CA using the new PUCCH format (that is, CA that can set 6 CC or more) is set, the user terminal sets the spreading factor designated from the radio base station by higher layer signaling or physical layer signaling. Set as the spreading factor of the PUCCH format.

  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 a downlink control channel (PDCCH (Physical Downlink Control Channel) or EPDCCH (Enhanced Physical Downlink Control Channel)), for example. is there.

  Alternatively, the user terminal determines (selects) a spreading factor used in the new PUCCH format based on the number of UCI bits when a CA using the new PUCCH format (that is, a CA that can set 6 CC or more) is set. ) And the spreading factor may be set. For example, the user terminal may determine the spreading factor of the new PUCCH format based on the number of UCI bits transmitted on the PUCCH and the maximum UCI bit number corresponding to the spreading factor (see FIG. 7).

<Signal generation processing>
A signal generation process in the new PUCCH format in which the spreading factor is set as described above will be described. FIG. 8 is a diagram illustrating an example of signal generation processing in the new PUCCH format. In FIG. 8, data symbol modulation is performed using QPSK (Quadrature Phase Shift Keying), but the modulation method is not limited to QPSK. Moreover, although FIG. 8 assumes the case where a new PUCCH format is comprised with 1PRB (12 subcarriers), a new PUCCH format may be comprised with two or more PRBs.

  As illustrated in FIG. 8, the user terminal adds CRC to the UCI as necessary, and inputs the x-bit UCI to a channel encoder. As described above, the UCI includes at least one of acknowledgment information (HARQ-ACK), scheduling request (SR), and channel state information (CSI). In addition, the UCI bit sequence is configured in the priority order of HARQ-ACK, SR, and CSI. For example, when the HARQ-ACK is greater than or equal to a predetermined number of bits, the user terminal may add a CRC to the UCI that includes the HARQ-ACK.

  The user terminal performs x-bit UCI encoding and rate matching in the channel encoder. Specifically, the user terminal encodes an x-bit UCI at a predetermined encoding rate (for example, 12/48). Further, when the number of encoded bits (hereinafter referred to as the number of encoded bits) exceeds the payload of the spreading factor set in the new PUCCH format, the user terminal punctures at least a part of the encoded bit sequence. On the other hand, when the number of encoded bits is less than the payload, the user terminal repeats at least a part of the encoded bit sequence until it matches the payload. Note that the above encoding procedure may be performed separately for each type of UCI (HARQ-ACK, SR, CQI), or all UCI bit sequences may be regarded as one bit sequence and performed at a time.

  For example, when the spreading factor of the new PUCCH format is set to 3, if the number of encoded bits exceeds 96 bits (see FIG. 7), the user terminal may replace a part of the encoded bit sequence (for example, excess bits). Puncture. On the other hand, if the number of encoded bits is less than 96 bits, the encoded bit sequence is repeated until it matches 96 bits.

  The user terminal maps (data symbol modulation) the encoded bit sequence of y bits obtained from the channel encoder to modulation symbols (SC-FDMA symbols). For example, in the case of QPSK, the user terminal performs discrete Fourier transform (DFT) on y / 2 modulation symbols. The user terminal converts a time-domain modulation symbol into a frequency-domain signal by DFT.

  The user terminal inputs each signal in the frequency domain to a predetermined subcarrier position of an Inverse Fast Fourier Transform (IFFT) having a predetermined frequency bandwidth (for example, 1 CC), and thereby a symbol in the time domain Convert to As shown in FIG. 6, when frequency hopping is performed between slots, the predetermined subcarrier position is switched between slots as shown in FIG.

  The user terminal performs block spreading every 12 symbols (24 bits in the case of QPSK) with respect to the symbols in the time domain. Specifically, the user terminal multiplies the IFFT symbol sequence by a spreading code (OCC: Orthogonal Cover Code) having a set spreading factor (n). Thereby, the same symbol sequence is mapped to n SC-FDMA symbols, and a plurality of user terminals are multiplexed by different OCCs. The user terminal multiplexes and transmits each block-spread symbol and a reference signal (for example, DMRS).

  For example, when the spreading factor of the new PUCCH format is set to 3 (n = 3), the same 12 symbol sequence (24 bits) is block spread to 3 symbols as shown in FIG. Four types of 12 symbol sequences (24 bits) are mapped. Also, in FIG. 9, three user terminals are code division multiplexed by multiplying different OCCs for each user terminal.

  As described above, in the first mode, since a new PUCCH format in which a spreading factor can be set is used, PUCCH is used with an optimum spreading factor according to the state (for example, the number of accommodated user terminals, UCI payload size, etc.). Can be sent.

(Second aspect)
In the second aspect, a radio communication method using a new PUCCH format in which the number of PRBs can be set will be described. The second mode may be used alone or in combination with the first mode.

  When the number of CCs that can be set per user terminal is expanded to 6 or more (for example, 32), it is desired to transmit HARQ-ACK of at least 128 bits in the new PUCCH format. As described above, if the spreading factor is reduced, the number of bits that can be accommodated increases. However, if at least 128 bits are to be accommodated by 1 PRB, even if the spreading factor is set to 1, it is assumed that the coding rate must be increased.

  For example, when the coding rate is 12/48, even if the spreading factor is 1, the maximum number of UCI bits is 64 (see FIG. 7), and at least 128 bits of HARQ-ACK cannot be accommodated. For this reason, it is conceivable to increase the coding rate to accommodate at least 128 bits. However, if the coding rate is increased, the required SINR (Signal-to-Interference plus Noise power Ratio) increases, so the coverage decreases. End up.

  Therefore, it is desired to increase the maximum number of UCI bits that can be accommodated in the new PUCCH format by using a new PUCCH format in which the number of PRBs can be set. FIG. 10 is an explanatory diagram of an example of a new PUCCH format in which the number of PRBs can be set. In addition, although FIG. 10 demonstrates the example in which DMRS per slot is 1 symbol, the number and position of DMRS are not restricted to what is shown in FIG. Further, in FIG. 10, an SRS may be arranged at the final symbol. 10 illustrates an example in which the spreading factor is 1, but the spreading factor is not limited to this. Further, in FIG. 10, a single hatch is used for UCI, but this hatching does not indicate that it is a single type of UCI.

  As shown in FIG. 10A, when the spreading factor is 1 and the number of PRBs is 1, 12 types of encoded bit sequences (6 types of encoded bit sequences per slot) are mapped in the new PUCCH format. As shown in FIG. 10B, when the spreading factor is 1 and the number of PRBs is 2, 24 types of encoded bit sequences (12 types of encoded bit sequences per slot) are mapped. As shown in FIG. 10C, when the spreading factor is 1 and the number of PRBs is 3, 36 types of encoded bit sequences (18 types of encoded bit sequences per slot) are mapped.

  FIG. 11 is a diagram showing the relationship between the number of PRBs and spreading factor used in the new PUCCH format, the payload of the new PUCCH format, and the maximum number of UCI bits that can be accommodated in the new PUCCH format. In FIG. 11, it is assumed that 1 DMRS is arranged per slot (that is, a case where an encoded bit sequence can be arranged in 6 symbols per slot), but is not limited thereto. In FIG. 11, it is assumed that the coding rate is 12/48 and an 8-bit CRC is added, but the present invention is not limited to this.

  As described above, when the spreading factor is 1 and the PRB number is 1, a coded bit sequence of 288 bits can be accommodated. On the other hand, when the spreading factor is 1 and the number of PRBs is 2, the new PUCCH format includes 12 symbols × 12 types (6 types per slot) × 2 (PRB) × 2 (QPSK) = 576-bit encoded bit sequence Can be accommodated. In this case, if the coding rate is 12/48 and an 8-bit CRC is added, the maximum number of UCI bits is 112 bits.

  When the spreading factor is 1 and the number of PRBs is 3, the new PUCCH format includes 12 symbols × 12 types (six types per slot) × 3 (PRB) × 2 (QPSK) = 864-bit coded bit sequence Can be accommodated. In this case, if the coding rate is 12/48 and an 8-bit CRC is added, the maximum number of UCI bits is 172 bits.

  Thus, increasing the number of PRBs in the new PUCCH format increases the payload while increasing the overhead. Therefore, the radio base station designates the number of PRBs according to the state (for example, the number of accommodated user terminals, the number of UCI bits, etc.), and transmits information indicating the number of PRBs to the user terminals. When CA using the new PUCCH format (that is, CA that can set 6 CC or more) is set, the user terminal sets the number of PRBs specified from the radio base station by higher layer signaling or physical layer signaling. Set as the number of PRBs in the PUCCH format.

  The higher layer signaling is RRC signaling, for example. Also, physical layer signaling is information included in DCI transmitted through a downlink control channel (PDCCH or EPDCCH), for example.

  Alternatively, the user terminal determines (selects) the number of PRBs used in the new PUCCH format based on the number of UCI bits when a CA using the new PUCCH format (that is, a CA that can set 6 CC or more) is set. ) And the number of PRBs may be set. For example, the user terminal may determine the number of PRBs in the new PUCCH format based on the number of UCI bits transmitted on the PUCCH and the maximum number of UCI bits according to the number of PRBs (see FIG. 11).

<Signal generation processing>
The signal generation process in the new PUCCH format in which the number of PRBs is set as described above will be described focusing on the differences from the first aspect. In the following, data symbol modulation is performed using QPSK, but the modulation method is not limited to QPSK. Moreover, although the case where a spreading | diffusion rate (SF) is 1 is assumed, a spreading | diffusion rate is not restricted to 1.

  In rate matching, the user terminal punctures at least a part of the coded bit sequence when the payload exceeds the number of PRB payloads set in the new PUCCH format. On the other hand, when the number of encoded bits is less than the payload, the user terminal repeats at least a part of the encoded bit sequence until it matches the payload.

  For example, when the number of PRBs in the new PUCCH format is set to 2, when the number of encoded bits exceeds 576 bits (see FIG. 11), the user terminal can replace a part of the encoded bit sequence (for example, excess bits). Puncture. On the other hand, if the number of encoded bits is less than 576 bits, the encoded bit sequence is repeated until it matches 576 bits.

  The user terminal maps the encoded bit sequence to modulation symbols (SC-FDMA symbols) and performs DFT on the modulation symbols. The user terminal performs IFFT on the frequency domain signal after DFT and converts it to a time domain symbol.

  If the number of PRBs constituting the new PUCCH format is m, the user terminal performs block spreading every 12 × m symbols (in the case of QPSK, 12 × m × 2 bits) for the symbols after IFFT. Specifically, the user terminal multiplies the IFFT symbol sequence by a spreading code (OCC) having a set spreading factor (n). Thereby, the same symbol sequence is mapped to n SC-FDMA symbols, and a plurality of user terminals are multiplexed by different OCCs. The user terminal multiplexes and transmits each block-spread symbol and a reference signal (for example, DMRS).

<Mapping process>
Next, the mapping process for the SC-FDMA symbol of each PRB of the symbol sequence generated as described above will be described in detail. FIG. 12 is a diagram illustrating an example of symbol sequence mapping.

  As illustrated in FIG. 12A, the user terminal may map (interleave) symbol sequences in order from the time (SC-FDMA symbol) direction among the PRBs of the set number of PRBs. That is, the user terminal may map (interleave) the symbol series in order from the previous SC-FDMA symbol in the time direction of the same resource block. In this case, since more frequency hopping for the symbol sequence (bit sequence) can be applied (twice for the entire sequence in the example of FIG. 12A), a high frequency diversity effect can be obtained, and a performance improvement effect can be expected.

  Alternatively, as shown in FIG. 12B, the user terminal starts from the first SC-FDMA symbol of the subframe, and then sets the PRB SC-FDMA symbols of the set number of PRBs (that is, sequentially from the frequency (PRB) direction). The symbol sequence may be mapped (interleaved). That is, the user terminal may map (interleave) the symbol series in order from the frequency direction (PRB direction) of the first SC-FDMA symbol of the subframe. In this case, since mapping is completed in units of SC-FDMA symbols, processing (for example, DFT precoding) and mapping (interleaving) required after mapping (interleaving) can be performed in parallel, and the transmission station (user Terminal) processing delay can be improved.

  As described above, in the second mode, the new PUCCH format in which the number of PRBs can be set is used. Can be sent.

(Wireless communication system)
Hereinafter, the configuration of a wireless communication system according to an embodiment of the present invention will be described. In this radio communication system, the radio communication method according to each aspect of the present invention is applied. In addition, the radio | wireless communication method which concerns on each said aspect may be applied independently, respectively, and may be applied in combination.

  FIG. 13 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention. In the radio communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit are applied. can do. The wireless communication system 1 may be referred to as SUPER 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G, 5G, FRA (Future Radio Access), or the like.

  The radio communication system 1 shown in FIG. 13 includes a radio base station 11 that forms a macro cell C1, and radio base stations 12a to 12c that are arranged in the macro cell C1 and form a small cell C2 that is narrower than the macro cell C1. . Moreover, the user terminal 20 is arrange | positioned at the macrocell C1 and each small cell C2.

  The user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 that use different frequencies simultaneously by CA or DC. In addition, the user terminal 20 can apply CA or DC using a plurality of cells (CC) (for example, six or more CCs).

  Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (referred to as an existing carrier or a legacy carrier). On the other hand, a carrier having a relatively high frequency band (for example, 3.5 GHz, 5 GHz, etc.) and a wide bandwidth may be used between the user terminal 20 and the radio base station 12, or The same carrier may be used. The configuration of the frequency band used by each radio base station is not limited to this.

  Between the wireless base station 11 and the wireless base station 12 (or between the two wireless base stations 12), a wired connection (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.) or a wireless connection It can be set as the structure to do.

  The radio base station 11 and each radio base station 12 are connected to the upper station apparatus 30 and connected to the core network 40 via the upper station apparatus 30. The upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto. Each radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11.

  The radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like. The radio base station 12 is a radio base station having local coverage, and is a small base station, micro base station, pico base station, femto base station, HeNB (Home eNodeB), RRH (Remote Radio Head), transmission / reception. It may be called a point. Hereinafter, when the radio base stations 11 and 12 are not distinguished, they are collectively referred to as a radio base station 10.

  Each user terminal 20 is a terminal compatible with various communication schemes such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal.

  In the radio communication system 1, OFDMA (orthogonal frequency division multiple access) is applied to the downlink and SC-FDMA (single carrier frequency division multiple access) is applied to the uplink as radio access schemes. OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier. SC-FDMA is a single carrier that reduces interference between terminals by dividing the system bandwidth (CC) into bands each consisting of one or continuous resource blocks for each terminal, and a plurality of terminals using different bands. Transmission method. The uplink and downlink radio access schemes are not limited to these combinations, and OFDMA may be applied in the uplink.

  In the wireless communication system 1, downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. Also, MIB (Master Information Block) is transmitted by PBCH.

  Downlink L1 / L2 control channels include downlink control channels (PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel)), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), etc. Including. Downlink control information (DCI) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH. The number of OFDM symbols used for PDCCH is transmitted by PCFICH. The HAICH transmission confirmation information (ACK / NACK) for PUSCH is transmitted by PHICH. EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel), and is used for transmission of DCI and the like in the same manner as PDCCH.

  In the wireless communication system 1, as an uplink channel, an uplink shared channel (PUSCH) shared by each user terminal 20, an uplink control channel (PUCCH), a random access channel (PRACH: PRACH). Physical Random Access Channel) is used. User data and higher layer control information are transmitted by the PUSCH. Uplink control information (UCI) including at least one of acknowledgment information (ACK / NACK) and radio quality information (CQI) is transmitted by PUSCH or PUCCH. A random access preamble for establishing connection with a cell is transmitted by the PRACH.

<Wireless base station>
FIG. 14 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment of the present invention. The radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Note that each of the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may be configured to include one or more.

  User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.

  The baseband signal processing unit 104 processes PDCP (Packet Data Convergence Protocol) layer processing, user data division / combination, RLC (Radio Link Control) retransmission control and other RLC layer transmission processing, MAC (Medium Access) for user data. Control) Retransmission control (for example, transmission processing of HARQ (Hybrid Automatic Repeat reQuest)), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, precoding processing, etc. Is transferred to the transmission / reception unit 103. The downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.

  The transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 to a radio frequency band and transmits the converted signal. The radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101.

  The transmitter / receiver, the transmission / reception circuit, or the transmission / reception device described based on the common recognition in the technical field according to the present invention can be used. In addition, the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.

  On the other hand, for the uplink signal, the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102. The transmission / reception unit 103 receives the uplink signal amplified by the amplifier unit 102. The transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.

  The baseband signal processing unit 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, and error correction on user data included in the input upstream signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106. The call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.

  The transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface. The transmission path interface 106 transmits and receives (backhaul signaling) signals to and from the adjacent radio base station 10 via an inter-base station interface (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). Also good.

  FIG. 15 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment. FIG. 15 mainly shows functional blocks of characteristic portions in the present embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication. As illustrated in FIG. 15, the baseband signal processing unit 104 includes a control unit 301, a transmission signal generation unit 302, and a reception signal processing unit 303.

  The control unit 301 controls the entire radio base station 10. For example, the control unit 301 controls generation of a downlink signal by the transmission signal generation unit 302 and signal reception processing by the reception signal processing unit 303.

  Specifically, the control unit 301 controls transmission of downlink user data (for example, modulation scheme, coding rate, resource allocation (scheduling), etc.) based on channel state information (CSI) reported from the user terminal 20. Control).

  Also, the control unit 301 controls mapping of downlink control information (DCI) including resource allocation information (DL / UL grant) for downlink / uplink user data to the downlink control channel (PDCCH and / or EPDCCH). Further, the control unit 301 controls mapping of downlink reference signals such as CRS (Cell-specific Reference Signal) and CSI-RS (Channel State Information Reference Signal).

  The control unit 301 controls carrier aggregation (CA) of the user terminal 20. Specifically, the control unit 301 determines CA application / change in the number of CCs based on CSI reported from the user terminal 20 and the like, and generates a transmission signal so as to generate information indicating the application / change. The unit 302 may be controlled. Note that the information indicating the application / change may be included in control information that is signaled by higher layers.

  In addition, the control unit 301 controls the spreading factor and / or the number of PRBs used in the new PUCCH format. Specifically, the control unit 301 determines the spreading factor and / or the number of PRBs according to the state (for example, the number of accommodated user terminals, the UCI payload size, etc.), and indicates the spreading factor and / or the number of PRBs The transmission signal generation unit 302 may be controlled so as to generate.

  Note that the information indicating the spreading factor and / or the number of PRBs is transmitted to the user terminal 20 by higher layer signaling when a CA using a new PUCCH format (that is, a CA that can set 6 CC or more) is set. Alternatively, it may be included in the DCI transmitted by the downlink control channel (PDCCH or EPDCCH).

  The control part 301 can be comprised from the controller, the control circuit, or control apparatus demonstrated based on the common recognition in the technical field which concerns on this invention.

  Based on an instruction from the control unit 301, the transmission signal generation unit 302 generates downlink signals (including downlink data signals and downlink control signals) (for example, CRC bit addition, encoding, modulation, mapping, IFFT, Spreading code multiplication).

  Specifically, the transmission signal generation unit 302 generates a downlink data signal (PDSCH) including notification information (control information) and user data based on the above-described upper layer signaling, and outputs the downlink data signal (PDSCH) to the transmission / reception unit 103. Also, the transmission signal generation unit 302 generates a downlink control signal (PDCCH) including the above-described DCI, and outputs the downlink control signal (PDCCH) to the transmission / reception unit 103. In addition, the transmission signal generation unit 302 generates downlink reference signals such as CRS and CSI-RS, and outputs them to the transmission / reception unit 103.

  The transmission signal generation unit 302 can be a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.

  The reception signal processing unit 303 performs reception processing (for example, demapping, demodulation, decoding, FFT, IDFT, etc.) on the uplink signal transmitted from the user terminal 20. The processing result is output to the control unit 301.

  Specifically, the reception signal processing unit 303 detects the PUCCH format and performs reception processing of UCI (at least one of HARQ-ACK, CQI, and SR). The reception signal processing unit 303 detects the spreading factor and / or the number of PRBs set in the new PUCCH format, and performs UCI reception processing. The spreading factor and / or the number of PRBs may be instructed from the control unit 301 or notified from the user terminal 20.

  The reception signal processing unit 303 may be configured by a signal processor, a signal processing circuit or a signal processing device, and a measuring device, a measurement circuit or a measuring device, which are described based on common recognition in the technical field according to the present invention. it can.

<User terminal>
FIG. 16 is a diagram illustrating an example of an overall configuration of a user terminal according to an embodiment of the present invention. The user terminal 20 includes a plurality of transmission / reception antennas 201 for MIMO transmission, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205.

  Radio frequency signals received by the plurality of transmission / reception antennas 201 are each amplified by the amplifier unit 202. Each transmitting / receiving unit 203 receives the downlink signal amplified by the amplifier unit 202. The transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204.

  The baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal. The downlink user data is transferred to the application unit 205. The application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. In addition, broadcast information in the downlink data is also transferred to the application unit 205.

  On the other hand, uplink user data is input from the application unit 205 to the baseband signal processing unit 204. The baseband signal processing unit 204 performs retransmission control transmission processing (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like. The data is transferred to the transmission / reception unit 203. The transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it. The radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.

  The transmission / reception unit 203 can be a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention. Further, the transmission / reception unit 203 may be configured as an integral transmission / reception unit, or may be configured from a transmission unit and a reception unit.

  FIG. 17 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment. Note that FIG. 17 mainly shows functional blocks of characteristic portions in the present embodiment, and the user terminal 20 also has other functional blocks necessary for wireless communication. As illustrated in FIG. 17, the baseband signal processing unit 204 included in the user terminal 20 includes a control unit 401, a transmission signal generation unit 402, a reception signal processing unit 403, and a measurement unit 404.

  The control unit 401 controls the entire user terminal 20. For example, the control unit 401 controls signal generation by the transmission signal generation unit 402 and signal reception processing by the reception signal processing unit 403.

  Specifically, the control unit 401 controls the PUCCH format applied to UCI (at least one of HARQ-ACK, CQI, and SR) transmission. Specifically, the control unit 401 determines whether to apply a new PUCCH format or an existing PUCCH format according to the number of CCs set for the user terminal 20 or the number of CCs scheduled for the user terminal 20. Also good. Further, when a plurality of new PUCCH formats are provided, the control unit 401 may determine a new PUCCH format to be applied according to the UCI payload.

  In addition, the control unit 401 sets the spreading factor and / or the number of PRBs used in the new PUCCH format. For example, when a CA that integrates six or more CCs is set, the control unit 401 sets the spreading factor and / or the number of resource blocks specified from the radio base station 10 by higher layer signaling or physical layer signaling. You may set to a PUCCH format. Alternatively, the control unit 401 may set the spreading factor and / or the number of resource blocks used in the new PUCCH format based on the number of UCI bits when CA that integrates six or more CCs is set. Good.

  In addition, the control unit 401 controls carrier aggregation (CA). Specifically, the control unit 401 performs CA based on information indicating application / change of CA from the radio base station 10.

  The control unit 401 can be composed of a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.

  The transmission signal generation unit 402 generates an uplink signal (including an uplink data signal and an uplink control signal) based on an instruction from the control unit 401 and outputs the uplink signal to the transmission / reception unit 203. For example, the transmission signal generation unit 402 generates an uplink control signal (PUCCH) including UCI (at least one of HARQ-ACK, CQI, and SR).

  When the number of bits of the UCI encoded bit string exceeds the payload (FIG. 7, 11) calculated based on the spreading factor and / or the number of PRBs set by the control unit 401, the transmission signal generation unit 402 If at least a part of the bit string is punctured and the payload is not enough, at least a part of the coded bit string may be repeated (FIG. 8).

  Also, transmission signal generation section 402 has a spreading factor set by control section 401 for a symbol sequence obtained by performing DFT and IFFT on an SC-FDMA symbol (modulation symbol) to which a UCI encoded bit string is mapped. Is multiplied by the spreading code (FIG. 8).

  Also, the transmission signal generation section 402 maps the UCI encoded bit string to PRB SC-FDMA symbols of the PRB number set by the control section 401. Specifically, transmission signal generation section 402 maps (interleaves) the encoded bit sequence in order from the previous SC-FDMA symbol in the time direction of the same resource block among the set number of PRBs. (FIG. 12A). Alternatively, the transmission signal generation unit 402 may map (interleave) the encoded bit sequences in order from the PRB direction (frequency direction) of the number of PRBs set in the first SC-FDMA symbol of the subframe (see FIG. 12B).

  The transmission signal generation unit 402 may be a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.

  The reception signal processing unit 403 performs reception processing (for example, demapping, demodulation, decoding, etc.) on downlink signals (including downlink control signals and downlink data signals). The reception signal processing unit 403 outputs information received from the radio base station 10 to the control unit 401. The reception signal processing unit 403 outputs, for example, broadcast information, system information, control information based on higher layer signaling such as RRC signaling, DCI, and the like to the control unit 401.

  The reception signal processing unit 403 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention. In addition, the reception signal processing unit 403 can constitute a reception unit according to the present invention.

  The measurement unit 404 measures the channel state based on a reference signal (for example, CSI-RS) from the radio base station 10 and outputs the measurement result to the control unit 401. Note that the channel state measurement may be performed for each CC.

  The measuring unit 404 can be composed of a signal processor, a signal processing circuit or a signal processing device, and a measuring device, a measuring circuit or a measuring device which are described based on common recognition in the technical field according to the present invention.

  In addition, the block diagram used for description of the said embodiment has shown the block of the functional unit. These functional blocks (components) are realized by any combination of hardware and software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one physically coupled device, or may be realized by two or more physically separated devices connected by wire or wirelessly and by a plurality of these devices. Good.

  For example, some or all of the functions of the radio base station 10 and the user terminal 20 are realized using hardware such as an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA). May be. The radio base station 10 or the user terminal 20 is a computer device including a processor (CPU: Central Processing Unit), a communication interface for network connection, a memory, and a computer-readable storage medium holding a program. It may be realized. That is, the radio base station, user terminal, and the like according to an embodiment of the present invention may function as a computer that performs processing of the radio communication method according to the present invention.

  Here, the processor, the memory, and the like are connected by a bus for communicating information. The computer-readable recording medium includes, for example, a flexible disk, a magneto-optical disk, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), a CD-ROM (Compact Disc-ROM), a RAM (Random Access Memory), A storage medium such as a hard disk. In addition, the program may be transmitted from a network via a telecommunication line. The radio base station 10 and the user terminal 20 may include an input device such as an input key and an output device such as a display.

  The functional configurations of the radio base station 10 and the user terminal 20 may be realized by the hardware described above, may be realized by a software module executed by a processor, or may be realized by a combination of both. The processor controls the entire user terminal 20 by operating an operating system. Further, the processor reads programs, software modules and data from the storage medium into the memory, and executes various processes according to these.

  Here, the program may be a program that causes a computer to execute the operations described in the above embodiments. For example, the control unit 401 of the user terminal 20 may be realized by a control program stored in a memory and operated by a processor, and may be realized similarly for other functional blocks.

  Also, software, instructions, etc. may be transmitted / received via a transmission medium. For example, 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. When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission media.

  Note that the terms described in this specification and / or terms necessary for understanding this specification may be replaced with terms having the same or similar meaning. For example, the channel and / or symbol may be a signal (signaling). The signal may be a message. Further, the component carrier (CC) may be called a carrier frequency, a cell, or the like.

  In addition, information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information. . For example, the radio resource may be indicated by an index.

  Information, signals, etc. described herein may be represented using any of a variety of different technologies. For example, 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

  Each aspect / embodiment described in this specification may be used independently, may be used in combination, or may be switched according to execution. In addition, notification of predetermined information (for example, notification of being “X”) is not limited to explicitly performed, but is performed implicitly (for example, by not performing notification of the predetermined information). May be.

  The notification of information is not limited to the aspect / embodiment described in the present specification, and may be performed by other methods. For example, notification of information 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. Further, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.

  Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, Future Radio Access (FRA), CDMA2000, UMB. (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other suitable systems The present invention may be applied to a system and / or a next-generation system extended based on these systems.

  As long as there is no contradiction, the order of the processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be changed. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

  Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

DESCRIPTION OF SYMBOLS 1 Wireless communication system 10 Wireless base station 20 User terminal 101 Transmission / reception antenna 102 Amplifier part 103 Transmission / reception part 104 Baseband signal processing part 105 Call processing part 106 Transmission path interface 201 Transmission / reception antenna 202 Amplifier part 203 Transmission / reception part 204 Baseband signal processing part 205 Application unit 301, 401 Control unit 302, 402 Transmission signal generation unit 303, 403 Reception signal processing unit 404 Measurement unit

Claims (7)

A transmitter that transmits uplink control information (UCI) using an uplink control channel;
On the basis of the spreading factor of the uplink control channel, comprising a control unit for controlling at least one of sending product及beauty of the UCI,
The control unit fixes at least one of the number of symbols and the position of a demodulation reference signal in a slot for at least two spreading factors .   The user terminal according to claim 1, wherein the receiving unit receives information indicating the spreading factor through higher layer signaling. The user terminal according to claim 1 or 2, wherein the spreading factor is any one of 1, 2, and 3. The control unit includes the number of resource blocks used in the uplink control channel controlled based on the spreading factor, the number of symbols excluding the demodulation reference signal in the slot, the modulation scheme, and the information indicating the spreading factor. The user terminal according to any one of claims 1 to 3 , wherein the number of bits to be transmitted on the uplink control channel is determined based on at least one. Wherein the control unit, the UCI, in order from the head of the symbol of the subframe using the uplink control channel, any of claims 1 to 4, wherein the mapping over a plurality of resource blocks for each symbol The user terminal according to Crab. A receiving unit that receives uplink control information (UCI) using an uplink control channel;
A control unit that controls reception of the UCI based on a spreading factor of the uplink control channel ,
A radio base station characterized in that at least one of the number of symbols and the position of a demodulation reference signal in a slot is fixed for at least two spreading factors . A wireless communication method in a user terminal,
Transmitting uplink control information (UCI) using an uplink control channel;
On the basis of the spreading factor of the uplink control channel, and a step of controlling at least one of sending product及beauty of the UCI,
A radio communication method, wherein at least one of the number of symbols and the position of a demodulation reference signal in a slot is fixed for at least two spreading factors .

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