WO 2020/000356
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`PCT/CN2018/093604
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`TRANSMISSION APPARATUS, RECEPTION APPARATUS, TRANSMISSION
`
`METHOD, AND RECEPTION METHOD
`
`Technical Field
`
`[0001] The present disclosure relates to a transmission apparatus, a reception apparatus, a
`
`transmission method, and a reception method.
`
`Background Art
`
`[0002]
`
`In the standardization of 5G a new radio access technology (NR: New Radio) not
`
`10
`
`necessarily
`
`having
`
`backward
`
`compatibility
`
`with
`
`Long
`
`Term
`
`Evolution
`
`(LTE)/LTE-Advanced has been discussed in the 3rd generation partnership project (3GPP).
`
`[0003]
`
`In NR, as with LTE-License-Assisted Access(LAA), an operation in unlicensed
`
`bands is expected.
`
`In addition, in order to implement NR Stand-alone (operable by NR
`
`alone) in unlicensed bands, introducing the physical random access channel (PRACH),
`
`15
`
`which has not been introduced into LTE-LAA, into unlicensed bands has been discussed
`
`(see, e.g., Non-Patent Literature (hereinafter, referred to as "NPL") 1).
`
`Citation List
`
`Non-Patent Literature
`
`20
`
`[0004]
`
`NPL1
`
`InterDigital, R1-1804869, "On UL Physical Layer Channel Design for NR-U," 3GPP
`
`TSG-RAN WGI Meeting #92b, April 2018
`
`NPL 2
`
`25
`
`MediaTek, R1-1804064, "On physical layer channel design for NR-U operation,"
`
`3GPP TSG-RAN WGI Meeting #92b
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`NPL 3
`
`NPL 4
`
`3GPP TS 36.213 V15.1.0, "Physical layer procedures (Release 15)," 2018-03
`
`3GPP TS 38.331 V15.1.0,
`
`"NR; Radio Resource Control
`
`(RRC) protocol
`
`specification (Release 15)," 2018-03
`
`Summary
`
`[0005] There has been no sufficient discussion on transmission methods for signals in
`
`unlicensed bands, however.
`
`10
`
`[0006] One non-limiting and exemplary embodimentfacilitates providing a transmission
`
`apparatus, a reception apparatus, a transmission method, and a reception method each
`
`enabling appropriately transmitting a signal in an unlicensed band.
`
`[0007]
`
`In one general aspect, a transmission apparatus according to the present disclosure
`
`includes: a transmission circuit, which in operation, transmits a signal; and a control circuit,
`
`15
`
`which in operation, determines an allocation resource to which the signal is assigned in a
`
`predetermined frequency band, in which the predetermined frequency bandis divided into
`
`a plurality of bands, and each of the plurality of bands includes a plurality of frequency
`
`resources respectively being base units of resource allocation for the signal, the allocation
`
`resource is composed of at least one of the base units of each of the plurality of bands, and
`
`20
`
`a configuration method of the at least one of the base units forming the allocation resource
`
`is different for each of the plurality of bands.
`
`[0008]
`
`In another general aspect, a reception apparatus according to the present
`
`disclosure includes: a reception circuit, which in operation, receives a signal; and a control
`
`circuit, which in operation, determines an allocation resource to which the signal
`
`is
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`25
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`assigned in a predetermined frequency band, in which the predetermined frequency bandis
`
`divided into a plurality of bands, and each of the plurality of bands includes a plurality of
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`frequency resources respectively being base units of resource allocation for the signal, the
`
`allocation resource is composed of at least one of the base units of each of the plurality of
`
`bands, and a configuration method of the at
`
`least one of the base units forming the
`
`allocation resourceis different for each of the plurality of bands.
`
`[0009]
`
`In still another general aspect, a transmission method according to the present
`
`disclosure includes: transmitting a signal; and determining an allocation resource to which
`
`the signal
`
`is assigned in a predetermined frequency band,
`
`in which the predetermined
`
`frequency band is divided into a plurality of bands, and each of the plurality of bands
`
`includes a plurality of frequency resources respectively being base units of resource
`
`10
`
`allocation for the signal, the allocation resource is composed of at least one of the base
`
`units of each of the plurality of bands, and a configuration method of the at least one of the
`
`base units forming the allocation resourceis different for each of the plurality of bands.
`
`[0010]
`
`In still another general aspect, a reception method according to the present
`
`disclosure includes: receiving a signal; and determining an allocation resource to which the
`
`15
`
`signal
`
`is assigned in a predetermined frequency band,
`
`in which the predetermined
`
`frequency band is divided into a plurality of bands, and each of the plurality of bands
`
`includes a plurality of frequency resources respectively being base units of resource
`
`allocation for the signal, the allocation resource is composed of at least one of the base
`
`units of each of the plurality of bands, and a configuration method of the at least one of the
`
`20
`
`base units forming the allocation resource is different for each of the plurality of bands.
`
`[0011]
`
`It should be noted that general or specific embodiments may be implemented as a
`
`system, an apparatus, a method, an integrated circuit, a computer program or a storage
`
`medium, or any selective combination of the system,
`
`the apparatus,
`
`the method,
`
`the
`
`integrated circuit, the computer program, and the storage medium.
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`25
`
`[0012] According to an aspect of this disclosure,
`
`a signal can be appropriately
`
`transmitted in an unlicensed band.
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`[0013] Additional benefits and advantages of the disclosed embodiments will become
`
`apparent from the specification and drawings. The benefits and/or advantages may be
`
`individually obtained by the various embodiments and features of the specification and
`
`drawings, which need not all be provided in order to obtain one or more of such benefits
`
`and/or advantages.
`
`Brief Description of Drawings
`
`[0014]
`
`FIG. 1 is a diagram illustrating a configuration example of PRACH;
`
`10
`
`FIG 2 is a diagram illustrating an example of resource allocation in B-IFDMA;
`
`FIG, 3 is a diagram illustrating another example of resource allocation in B-IFDMA;
`
`FIG. 4 is a diagram illustrating exemplary autocorrelation properties of PRACH;
`
`FIG. 5 is a diagram illustrating an example of a cluster block-interlace mappingtable
`
`and resource allocation in case 1 mapping;
`
`15
`
`FIG. 6 is a diagram illustrating a comparison example of autocorrelation properties
`
`between B-IFDMAandcase | mapping;
`
`FIG 7 is a diagram illustrating an example of a cluster block-interlace mapping table
`
`and resource allocation in case 2 mapping;
`
`FIG. 8 is a diagram illustrating a comparison example of autocorrelation properties
`
`20
`
`between B-IFDMAandcase 2 mapping;
`
`FIG. 9 is a block diagram illustrating a configuration of part of a base station
`
`according to Embodiment1;
`
`FIG, 10 is a block diagram illustrating a configuration of part of a terminal according
`
`to Embodiment 1;
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`25
`
`FIG. 11 is a block diagram illustrating the configuration of the base station according
`
`to Embodiment 1;
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`FIG. 12 is a block diagram illustrating the configuration of the terminal according to
`
`Embodiment 1;
`
`FIG. 13 is a sequence diagram illustrating an operation example of the base station
`
`and terminal according to Embodiment1;
`
`FIG. 14 is a diagram illustrating exemplary interlace numbers for respective cluster
`
`blocks according to Configuration Example 1 of Calculation Example 1 of Embodiment1;
`
`FIG, 15 is a diagram illustrating exemplary interlace numbers for respective cluster
`
`blocks according to Configuration Example 2 of Calculation Example 1 of Embodiment 1;
`
`FIG. 16 is a diagram illustrating exemplary PRACH FDM resources according to
`
`10
`
`PRACH-Resource Determination Method 1 of Embodiment 1;
`
`FIG.
`
`17 is a diagram illustrating exemplary resource allocation according to
`
`PRACH-Resource Determination Method 1 of Embodiment1;
`
`FIG. 18 is a diagram illustrating exemplary PRACH FDM resources according to
`
`PRACHResource Determination Method 2 of Embodiment 1;
`
`15
`
`FIG. 19 is a diagram illustrating exemplary random access configurations;
`
`FIG, 20 is a diagram illustrating an exemplary PRACHrepetition configuration;
`
`FIG. 21 is a diagram illustrating exemplary interlace numbers for each cluster block
`
`according to Embodiment2;
`
`FIG. 22 is a diagram illustrating an example of a cluster block-interlace mapping
`
`20
`
`table according to another embodiment;
`
`FIG. 23 is a diagram illustrating an example of a cluster block-interlace mapping
`
`table according to still another embodiment; and
`
`FIG. 24 is a diagram illustrating an example of a cluster block-interlace mapping
`
`table according to yet another embodiment.
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`25
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`Description of Embodiments
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`[0015] Hereinafter, a detailed description will be given of embodiments of the present
`
`disclosure with reference to the accompanying drawings.
`
`[0016]
`
`[PRACH]
`
`As illustrated in FIG. 1, PRACH is composed of a cyclic prefix (CP), a preamble,
`
`and a guard period (GP).
`
`Preamble is generated from a code sequence, such as a
`
`Zadoff-Chu sequence, for example. Moreover, CP is a signal obtained by duplicating part
`
`of a preamble. GPis anon-transmission interval. PRACH is usedin a basestation (may
`
`be referred to as "gNB") for uplink transmission timing control of a terminal (hereinafter,
`
`may be referred to as "User Equipment (UE)"). The basestation, for example, detects a
`
`10
`
`received signal from PRACHandcontrols uplink transmission timing of the terminal such
`
`that the received signal (including a delay wave) canfit into the CP.
`
`[0017]
`
`[B-IFDMA]
`
`As one PRACHtransmission method in an unlicensed band, the block-interleaved
`
`frequency division multiple access (B-IFDMA), which has been introduced as a physical
`
`15
`
`uplink shared channel (PUSCH) transmission method in LTE-LAA, has been under study
`
`(see, e.g., NPL 1).
`
`[0018] B-IFDMAis a method that transmits a signal using bandscalled interlaces which
`
`are uniformly distributed in a frequency direction within a system band, in order to comply
`
`with regulation of the occupied channel bandwidth (OCB) of unlicensed bands and
`
`20
`
`mitigate the impact of powerspectral density (PSD) limit.
`
`[0019]
`
`Interlaces are each composed of contiguous subcarriers (block of contiguous
`
`frequency resources).
`
`Interlaces are each a base unit of resource allocation for a signal in
`
`an unlicensed band. A plurality of interlaces are included within each band resulting from
`
`division of a system band into a plurality of blocks (hereinafter, each band is referred to as
`
`25
`
`"cluster block"), for example. Each of the interlaces included in each cluster block is
`
`assigned a number(hereinafter, referred to as "interlace number").
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`[0020] Note that, the term "cluster block" has meaning similar to an "interval" in which
`
`an interlace of the same interlace number is mapped. More specifically, the interlaces of
`
`the same interlace number are uniformly distributed in the frequency direction over a
`
`plurality of cluster blocks.
`
`[0021] Furthermore, a cluster block may be defined not only as each band resulting from
`
`division of a system band into a plurality of blocks, but also as each band resulting from
`
`division of a predetermined band (e.g., such as a band wherethe listen before talk (LBT) is
`
`performed or a 20 MHz band or a band of an integral multiple of 20 MHz)into a plurality
`
`of blocks.
`
`10
`
`[0022]
`
`In LTE-LAA in which the system bandwidth is 20 MHz (100 physical resource
`
`blocks (PRBs)), for example, the bandwidth per interlace is | PRB (12 subcarriers). As
`
`illustrated in FIG. 2, for example, a signal (e.g., PUSCH)is transmitted using 10 interlaces
`
`mapped with an interval of 10 PRBs (see, e.g., NPL 3).
`
`[0023]
`
`In FIG 2, for example, 10 interlaces in each cluster block are assigned interlace
`
`15
`
`numbers, namely, interlace #0, #1,
`
`.... #9. Moreover, in FIG 2, the cluster blocks are
`
`assigned cluster block numbers, namely, cluster block #0, #1,
`
`..., #9.
`
`In case of FIG 2,
`
`the interlaces of the same interlace number are uniformly distributed in the frequency
`
`direction for 10 PRBs each (in other words, for respective cluster blocks).
`
`In a case
`
`where PUSCHis transmitted using the interlaces of one interlace number (interlace number
`
`20
`
`#0 in FIG 2), for example, PRB indices (or referred to as "PRB numbers") to which
`
`PUSCHis assignedare as follows (0, 10, 20, ..., 90).
`
`[0024] Moreover, PUSCH of LTE-LAAcan be transmitted using a plurality of interlaces
`
`(frequency resources)
`
`in each cluster block.
`
`FIG 3
`
`illustrates exemplary resource
`
`allocation of a case where PUSCHis transmitted using twointerlaces (e.g., interlace #0,
`
`25
`
`#5) in each cluster block, for example.
`
`[0025] As described above,
`
`in LTE-LAA,
`
`the interlace numbers used for PUSCH
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`transmission are the same in each cluster block.
`
`Stated differently, the frequency intervals
`
`for mapping the interlaces (of the same interlace number) used for PUSCH transmission in
`
`each cluster block are the same.
`
`In the example of FIG. 2 or FIG. 3, the interlaces of the
`
`same interlace number are mapped with each frequency interval (10 interlaces or 10 PRBs)
`
`corresponding to the cluster block, for example.
`
`[0026]
`
`[PRACH Transmission Using B-IFDMA]
`
`In a case where PRACH is transmitted using B-IFDMA,
`
`the autocorrelation
`
`properties of PRACH degrade, which in turn, causes a problem in that the estimation
`
`accuracy of uplink transmission timing degrades(see, e.g., NPL 2).
`
`10
`
`[0027] Asan example, FIG 4 illustrates the autocorrelation properties of a case where the
`
`system bandwidth is set to 20 MHz (FFT size=2048) and a Zadoff-Chu sequence having a
`
`sequence length 113 is used as a preamble of PRACH,and the preambleis assigned to a
`
`continuous band as in LTE (left side of FIG 4), and FIG 4 also illustrates the
`
`autocorrelation properties of a case where a preamble is assigned to a band using
`
`15
`
`B-IFDMA(right side of FIG 4).
`
`Asillustrated in FIG. 4, it can be seen that there occur
`
`many peaks (side lobes) at positions other than a correct timing position in autocorrelation
`
`properties in the case where a preamble is transmitted using B-IFDMA. One sample of
`
`the horizontal axis of FIG. 4 is equivalent to 32.55[ns], for example, so that a side lobe has
`
`a width of approximately several us.
`
`20
`
`[0028] Accordingly, in a case where a terminal transmits PRACH, using B-IFDMA,the
`
`estimation accuracy of uplink transmission timing in a base station adversely degrades.
`
`In
`
`a case where the estimation accuracy of uplink transmission timing degrades, the base
`
`station cannot control the uplink transmission timing of the terminal in a normal way, so
`
`that uplink reception performance adversely degrades.
`
`25
`
`[0029]
`
`In this respect, a description will be given hereinafter of a PRACH transmission
`
`method that prevents degradation of the estimation accuracy of uplink transmission timing
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`in a base station and that improves the uplink reception performance in the basestation in a
`
`case where a terminal transmits PRACH.
`
`[0030]
`
`In LTE-LAA,
`
`the interlace numbers in each cluster block used for signal
`
`transmission are the same (see, e.g., FIG. 2 or FIG 3). Meanwhile, in an aspect of the
`
`present disclosure, at least one of the interlace numbers in each cluster block used for
`
`PRACHtransmission is different.
`
`Stated differently, in an aspect of the present disclosure,
`
`a configuration method of interlaces (blocks of contiguous frequency resources) forming an
`
`allocation resource to which PRACH is assigned (hereinafter, may be referred to as
`
`"PRACHresource") is different for each band resulting from division of a system band into
`
`10
`
`a plurality of blocks (e.g., cluster blocks).
`
`[0031] The inventors of the present disclosure have found by computer simulation that
`
`the estimation accuracy of uplink transmission timing described above can be improved by
`
`changing an interlace (in other words, interlace number) to which a PRACHresourceis
`
`allocated to another for each cluster block in a case where PRACHis transmitted using an
`
`15
`
`interlace in a cluster block as in B-IFDMA.
`
`[0032] Hereinafter, a description will be given of, as an example of a method of changing
`
`an interlace number for each cluster block, an exemplary case where a different interlace
`
`number is used between odd number cluster blocks and even number cluster blocks
`
`(hereinafter, referred to as "case 1 mapping") and an exemplary case where an interlace
`
`20
`
`number for each cluster block is configured using a random number(hereinafter, referred
`
`to as "case 2 mapping").
`
`[0033] Note that, as an example, each cluster block includes 10 interlaces and these
`
`interlaces are respectively assigned interlace numbers, namely, interlace #0, #1,..., #9 (see,
`
`FIG. 5 and FIG.7 to be described, hereinafter) in the following description. Moreover, the
`
`25
`
`cluster blocks are respectively assigned cluster block numbers, namely, cluster block #0,
`
`#1,..., #9 (see, FIG. 5 and FIG 7 to be described, hereinafter).
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`[0034] FIG 5 isa diagram illustrating an exemplary table indicating interlace numbers for
`
`respective cluster blocks
`
`in case
`
`1 mapping (hereinafter,
`
`referred to as
`
`"cluster
`
`block-interlace mapping table"), and illustrating a resource mapping example of a case
`
`wherethis cluster block-interlace mapping table is used.
`
`[0035]
`
`In FIG 5, for a signal (e.g., PRACH), even numbercluster blocks are assigned
`
`interlace #0 and odd number cluster blocks are assigned interlace #1. As illustrated in
`
`FIG 5, the interlace number used for one PRACH transmission is different between even
`
`number cluster blocks and odd number cluster blocks.
`
`Stated differently,
`
`in FIG 5, a
`
`frequency resource position to which PRACHis assigned in each cluster block differs
`
`10
`
`between even numbercluster blocks and odd numbercluster blocks.
`
`[0036] FIG 6 illustrates autocorrelation properties (indicated by solid lines) in PRACH
`
`transmission, using B-IFDMA(see, e.g., FIG. 2) and autocorrelation properties (indicated
`
`by dotted lines) in PRACH transmission, using case 1 mapping (see, e.g., FIG 5). As
`
`illustrated in FIG 6,
`
`it can be seen that
`
`the power of side lobes decreases in the
`
`15
`
`autocorrelation properties when case 1 mapping is used (mapping to the resources
`
`illustrated in FIG. 5) as compared with the case where B-IFDMAis used. Accordingly, it
`
`is considered that the estimation accuracy of uplink transmission timing in the base station
`
`is improved by using case 1 mapping.
`
`[0037] Moreover, as to cubic matric (CM) properties having impact on the performance
`
`20
`
`of a power amplifier, CM is 1.72 dB when B-IFDMAis used, whereas CM is 1.88 dB
`
`when case 1 mapping is used. Thus, there is no difference in CM properties between
`
`B-IFDMAandcase 1 mapping.
`
`[0038] Next, FIG 7 is a diagram illustrating an exemplary cluster block-interlace
`
`mapping table in case 2 mapping,and illustrating a resource mapping example of a case
`
`25
`
`wherethis cluster block-interlace mapping table is used.
`
`[0039]
`
`In FIG 7, a signal (e.g., PRACH)is assigned an interlace number, using a random
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`number for each cluster block. As illustrated in FIG 7, the interlace number used for
`
`transmission of one PRACH becomes a random numberin each cluster block (any one of 0,
`
`1, 3, 4, 5, or 7) in FIG. 7.
`
`Stated differently, in FIG 7, a frequency resource position to
`
`which PRACHis assigned in each cluster block is randomly configured, and there is a high
`
`possibility that the frequency resource positions will be different in the respective cluster
`
`block.
`
`[0040] FIG8illustrates autocorrelation properties (indicated by solid lines) in PRACH
`
`transmission, using B-IFDMA(see, e.g., FIG 2), and autocorrelation properties (indicated
`
`by dotted lines) in PRACH transmission, using case 2 mapping (see, e.g., FIG 7). As
`
`10
`
`illustrated in FIG 8, it can be seen that the power of side lobes decreases in autocorrelation
`
`properties when case 2 mapping is used (mapping to the resources illustrated in FIG. 7) as
`
`compared with the case where B-IFDMAis used.
`
`In addition, as illustrated in FIG. 8, it
`
`can be seen that the power reduction amount of side lobes in autocorrelation properties
`
`when case 2 mapping is used is large as compared with the case where case 1 mappingis
`
`15
`
`used (see, e.g., FIG 6). Accordingly,
`
`it is considered that the estimation accuracy of
`
`uplink transmission timing in the base station is improved by using case 2 mapping as
`
`compared with B-IFDMAandcase | mapping.
`
`[0041]
`
`In addition, as to cubic matric (CM) properties, CM is 1.72 dB when B-IFDMAis
`
`used, whereas CM is 2.80 dB when case 2 mapping is used. Thus, the CM increases
`
`20
`
`when case 2 mapping is used. As the CM increases, the power consumption amount used
`
`for signal
`
`transmission increases,
`
`so that
`
`the battery life of the terminal adversely
`
`decreases.
`
`[0042] As described above, as with case 1 mapping illustrated in FIG. 5 or as with case 2
`
`mapping illustrated in FIG. 7, by changing the interlace numberto be assigned to a signal,
`
`25
`
`for each cluster block,
`
`the estimation accuracy of uplink transmission timing can be
`
`improved as compared with a case where B-IFDMAis used.
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`[0043] Note that, the method of changing an interlace number of each cluster block is not
`
`limited to case 1 mapping and case 2 mapping. As long as a pattern using an interlace
`
`number configured for each cluster block (in other words, pattern including a different
`
`interlace number) is used, the estimation accuracy of uplink transmission timing can be
`
`improved with any pattern as compared with B-IFDMA.
`
`[0044] Furthermore, as illustrated in FIG. 6 and FIG 8, as the randomnessofthe interlace
`
`number to be configured for each cluster block becomes higher,
`
`the power reduction
`
`amountof side lobes in autocorrelation properties becomeslarger but the CM also becomes
`
`higher.
`
`Stated differently, with the method of changing an interlace number for each
`
`10
`
`cluster block, the power reduction effect of side lobes and the CM properties are in a
`
`trade-off relationship.
`
`[0045] Moreover, for PRACH in NR (e.g., may be referred to as "NR PRACH"), a
`
`plurality of resources (hereinafter, may be referred to as "PRACH resource") can be
`
`configured in a frequency domain.
`
`The number of PRACH FDM resources to be
`
`15
`
`frequency multiplexed in one time unit can be changed from among 1, 2, 4, and 8, using
`
`higher layer signaling (e.g., control signal called msg1-FDM), for example (e.g., see NPL
`
`4).
`
`[0046]
`
`(Embodiment1)
`
`[Summary of Communication System]
`
`20
`
`A communication system according to an embodiment of the present disclosure
`
`includes base station 100 and terminal 200.
`
`In the following description, as an example,
`
`terminal 200 (corresponding to a transmission apparatus) transmits PRACH and base
`
`station 100 (corresponding to a reception apparatus) receives PRACH.
`
`[0047]
`
`FIG9 is a block diagram illustrating part of a configuration of base station 100
`
`25
`
`according to the embodiment of the present disclosure.
`
`In base station 100 illustrated in
`
`FIG. 9, radio receiver 109 receives a signal (e.g., PRACH), and controller 101 determines
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`an allocation resource to which a signal
`
`is assigned (e.g., PRACH resource)
`
`in a
`
`predetermined frequency band.
`
`[0048] FIG 10 is a block diagram illustrating part of a configuration of terminal 200
`
`according to the embodimentof the present disclosure.
`
`In terminal 200 illustrated in FIG.
`
`10, radio transmitter 209 transmits a signal (e.g., PRACH), and controller 204 determines
`
`an allocation resource to which a signal
`
`is assigned (e.g., PRACH resource)
`
`in a
`
`predetermined frequency band.
`
`[0049] Note that, the predetermined frequency band is divided into a plurality of bands
`
`(e.g. cluster blocks), and each of the plurality of bands includes a plurality of frequency
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`10
`
`resources (e.g.,
`
`interlaces) which are base units of resource allocation for a signal.
`
`Moreover, an allocation resource to which a signal is assigned is composed of at least one
`
`base unit of each of the plurality of bands. Moreover, a configuration method of base
`
`units forming the allocation resource is different for each of the plurality of bands.
`
`[0050]
`
`[Configuration of Base Station]
`
`15
`
`FIG. 11 is a block diagram illustrating a configuration of base station 100 according
`
`to the present embodiment.
`
`[0051]
`
`In FIG 11, base station 100 includes controller 101, replica signal generator 104,
`
`control
`
`information generator 105, encoder and modulator 106, radio transmitter 107,
`
`antenna 108, radio receiver 109, and detector 110.
`
`20
`
`[0052] Controller 101 (e.g., scheduler) allocates a resource in uplink transmission for
`
`terminal 200, for example. Controller 101 determines an allocation resource to be used
`
`for PRACH transmission (e.g., PRACH FDM resource), for example. Controller 101
`
`includes interlace number determiner 102 and PRACHresource determiner 103.
`
`[0053]
`
`Interlace number determiner 102 determines, for each cluster block, an interlace
`
`25
`
`number to which PRACH is assigned.
`
`Interlace number determiner 102 outputs
`
`information indicating the determined interlace number for each cluster block to PRACH
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`resource determiner 103 and control
`
`information generator 105. When indicating a
`
`parameter used for determining the interlace numberfor each cluster block to terminal 200,
`
`interlace number determiner 102 outputs the information indicating the parameter to
`
`control information generator 105. Note that, the details of a determination method of an
`
`interlace number for each cluster block in interlace number determiner 102 will be
`
`provided, hereinafter.
`
`[0054]
`
`PRACH resource determiner 103 determines an interlace number for each
`
`PRACH FDMresource based on the interlace number for each cluster block, which is
`
`inputted from interlace number determiner 102. PRACH resource determiner 103 outputs
`
`10
`
`information indicating the determined interlace number for each PRACH FDMresourceto
`
`replica signal generator 104 and control
`
`information generator 105. Moreover, when
`
`indicating a parameter used for determining the interlace number for each PRACH FDM
`
`resource to terminal 200, PRACHresource determiner 103 outputs information indicating
`
`the parameter
`
`to control
`
`information generator 105. Note that,
`
`the details of a
`
`15
`
`determination method of an interlace number for each PRACH FDM resource in PRACH
`
`resource determiner 103 will be provided, hereinafter.
`
`[0055] Replica signal generator 104 generates a replica signal for detecting a PRACH
`
`preamble, based on the information to be inputted from PRACH resource determiner 103
`
`and outputs the generated replica signal to detector 110.
`
`20
`
`[0056] Control information generator 105 generates control information based on the
`
`information to be inputted from interlace number determiner 102 or PRACH resource
`
`determiner 103.
`
`Control
`
`information generator 105 outputs the generated control
`
`information to encoder and modulator 106.
`
`[0057] Note that, the information to be inputted from interlace number determiner 102
`
`25
`
`and PRACH resource determiner 103 is not necessarily indicated to terminal 200 at the
`
`same time. Part of the control information generated by control information generator
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`105 may be indicated to terminal 200 as cell common information or indicated to terminal
`
`200 as semi-static indication information, for example. Furthermore, part of the control
`
`information may be specified as system commoninformation by specification and does not
`
`have to be indicated from base station 100 to terminal 200.
`
`[0058] Encoder and modulator 106 modulates and encodes the control
`
`information
`
`inputted from control information generator 105 and outputs the encoded signal to radio
`
`transmitter 107.
`
`[0059] Radio transmitter 107 applies transmission processing, such as D/A conversion,
`
`up-conversion, amplification and/or the like,
`
`to the signal
`
`inputted from encoder and
`
`10
`
`modulator 106 and transmits a radio signal obtained by the transmission processing to
`
`terminal 200 via antenna 108.
`
`[0060] Radio receiver 109 applies reception processing, such as down-conversion, A/D
`
`conversion and/or the like, to the signal received from terminal 200 via antenna 108, and
`
`outputs the signal obtained by the reception processing to detector 110.
`
`15
`
`[0061] Detector 110 performs correlation processing between the signal inputted from
`
`radio receiver 109 and the replica signal inputted from replica signal generator 104 and
`
`performs detection of a PRACH preamble and timing estimation. Note that,
`
`the
`
`correlation processing to be performed in detector 110 may be processing to calculate a
`
`delay profile to be used in timing estimation by performing correlation processing in a time
`
`20
`
`domain or processing to calculate a delay profile by performing inverse fast Fourier
`
`transform (IFFT) after performing correlation processing (division processing)
`
`in a
`
`frequency domain.
`
`[0062]
`
`[Configuration of Terminal]
`
`FIG. 12 is a block diagram illustrating the configuration of terminal 200 according to
`
`25
`
`the present embodiment.
`
`[0063]
`
`In FIG 12, terminal 200 includes antenna 201, radio receiver 202, demodulator
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`and decoder 203, controller 204, transmission signal generator 207, resource allocator 208,
`
`and radio transmitter 209.
`
`[0064] Radio receiver 202 applies reception processing, such as down-conversion, A/D
`
`conversion and/or the like,
`
`to the received signal received from base station 100 via
`
`antenna 201 and outputs the signal obtained by the reception processing to demodulator
`
`and decoder 203.
`
`[0065] Demodulator and decoder 203 demodulates and decodes the received signal
`
`inputted from radio receiver 202 and extracts control information transmitted from base
`
`station 100, based on the decoding result. Demodulator and decoder 203 outputs the
`
`10
`
`extracted control information to controller 204.
`
`[0066] Controller 204 determines an allocation resource to which a transmission signal
`
`(e.g., PRACH)is assigned (e.g., PRACH FDM resource), based on the control information
`
`inputted from demodulator and decoder 203. Controller 204 includes interlace number
`
`calculator 205 and PRACHresource determiner 206, for example.
`
`15
`
`[0067]
`
`Interlace number calculator 205 calculates, for each cluster block, an interlace
`
`number to which PRACHis assigned, based on the control information inputted from
`
`demodulator and decoder 203.
`
`Interlace number calculator 205 outputs information
`
`indicating the interlace number for each cluster block obtained by the calculation to
`
`PRACHresource determiner 206. Note that, the details of a calculation method of an
`
`20
`
`interlace numberfor each cluster block in interlace number calculator 205 will be provided,
`
`hereinafter.
`
`[0068] An operation of PRACH resource determiner 206 is similar to an operation of
`
`PRACHresource determiner 103 of base station 100. PRACH resource determiner 206
`
`determines an interlace number for each PRACH FDM resource based on the control
`
`25
`
`information inputted from demodulator and decoder 203 and the information indicating
`
`interlace number for each cluster block which is inputted from interlace numbercalculator
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`205, for example. PRACH resource determiner 206 outputs the information indicating
`
`the determined interlace number for each PRACH FDMresource to resource allocator 208.
`
`Note that, the details of a determination method of an interlace number for each PRACH
`
`FDM resource in PRACHresource determiner 206 will be provided, hereinafter.
`
`[0069] Transmission signal generator 207 generates a transmission signal (e.g., PRACH
`
`preamble of FIG. 1) and outputs the generated transmission signal to resource allocator 208.
`
`The transmission signal, for example, may be a code sequence generated by adding a cyclic
`
`shift and/or the like to a code sequence of a Zadoff-Chu sequence and/or the like.
`
`Furthermore, the PRACH preamble may be generated in a frequency domain or may be
`
`10
`
`generated by conversion of a code sequence generated in a time domain into a code
`
`sequence of a frequency domain, using fast Fourier transform (FFT).
`
`[0070] Resource allocator 208 assigns a transmission signal (e.g., code sequence) to be
`
`inputted from transmission signal generator 207 to