The present disclosure relates to an apparatus and a method.
Background A1t
SP365458WOOO
In recent years, as a representative of multicarrier modulation techniques
(that is, multiplexing techniques or multiple access technologies), mthogonal
frequency division multiplexing (OFDM) and Oithogonal frequency division multiple
15 access (OFDMA) have been put to practical use in various wireless systems.
Application examples include digital broadcasting, a wireless LAN, and a cellular
system. OFDM has resistance with respect to a multi path propagation path and can
prevent the occurrence of inter-symbol interference caused by a multipath delay
wave by employing a cyclic prefix (CP). On the other hand, OFDM has a
20 disadvantage in that a level of out-of-band radiation is large. Fwther, a peak-toaverage
power ratio (PAPR) tends to increase, and there is also a disadvantage in
which it is vulnerable to distmtion occurring in transmission and reception
apparatuses.
25
[0003]
New modulation techniques capable of suppressing such out-of-band
radiation which is a disadvantage of OFDM are emergmg. These modulation
techniques introduce a new concept called a subsymbol and can design a time and a
frequency of a symbol flexibly by dividing one symbol into an arbitrary number of
subsymbols. Further, these modulation techniques can reduce unnecessary out-of-
30 band signal radiation by applying a pulse shaping filter to a symbol and performing
waveform shaping, and the frequency use efficiency is expected to be improved.
;
11
5
SP365458WOOO
2/60
Fwther, the present modulation technology makes it possible to more flexibly set a
resource by introducing a subsymbol, and thus serves as a means for expressing
diversity that is going to be desired in the fitture.
[0004]
These modulation techniques have various names such as universal filteredOFDM
(UF-OFDM), universal filtered multi-carrier (UFMC), filter bank multicarrier
(FBMC), and generalized OFDM (GOFDM). Particularly, since these
modulation techniques can be regarded as generalized OFDM, they are also referred
to as generalized fi·equency division multiplexing (GFDM), and this name is
10 employed in this specification. A basic technology related to GFDM is disclosed,
for example, in Patent Literature I and Non-Patent Literature I.
Citation List
Patent Literature
15 [0005]
20
Patent Literature I : us Patent Publication No.
2010/0189132AI
Non-Patent Literature
[0006]
Non-Patent Literature I: N. Michailow, et al., "Generalized Frequency
Division Multiplexing for 5th Generation Cellular Networks," IEEE Trans. Commun.,
Vol. 62, no. 9, Sept. 2014.
Disclosure of Invention
25 Technical Problem
[0007]
In OFDM, some of the frequency bands of carriers that can cause the signal
quality to degrade are not allowed to be used for preventing the reception success
probability from decreasing. In GFDM, some of the frequency bands of carriers are
30 not supposed to be used similarly. Here, in GFDM, subcarriers sometimes have
greater bandwidth as compared with OFDM. In that case, a decrease in frequency
~ . '
5
SP3G5458WOOO
3/60
use efficiency caused by refraining from using some of the fi·equency bands has great
influence. It is then desirable to provide a mechanism that can improve frequency
use efficiency while refi·aining from using some of the frequency bands of carriers in
GFDM.
Solution to Problem
[0008]
According to the present disclosure, there is provided an apparatus
including: a processing unit configured to variably set at least any of bandwidth of a
10 subcarrier or time length of a subsymbol included in a unit resource including one or
more subcarriers or one or more subsymbols, and set, as a used subcarrier, at least a
part of a frequency band corresponding to an unused subcarrier of a first resource in
a second resource including the unit resource in which the bandwidth of the
subcarrier is less than in the first resource.
15 [0009]
In addition, according to the pt·esent disclosure, there is provided an
apparatus including: a processing unit configured to demodulate a first resource and
a second resource in which at least any of bandwidth of a subcarrier or time length of
a subsymbol included in a unit resource including one or more subcarriers or one or
20 more subsymbols is variably set. The bandwidth of the subcarrier is less in the
second resource than in the first resource, and at least a part of a frequency band
corresponding to an unused subcarrier of the first resource is set as a used subcarrier.
[001 0]
In addition, according to the present disclosure, there is provided a method
25 including: variably setting at least any of bandwidth of a subcarrier or time length of
a subsymbol included in a unit resource including one or more subcarriers or one or
more subsymbols, and setting, by a processor, as a used subcarrier, at least a part of a
frequency band corresponding to an unused subcarrier of a first resource in a second
resource including the unit resource in which the bandwidth of the subcarrier is less
30 than in the first resource.
[00 I I]
I
SP365458WOOO
4/60
In addition, according to the present disclosure, there is provided a method
including: demodulating, by a processor, a first resource and a second resource in
which at least any of bandwidth of a subcarrier or time length of a subsymbol
included in a unit resource including one or more subcarriers or one or more
5 subsymbols is variably set. The bandwidth of the subcarrier is less in the second
resource than in the first resource, and at least a part of a fi·equency band
corresponding to an unused subcarrier of the first resource is set as a used subcarrier.
Advantageous Effects oflnvention
10 [0012]
According to the present disclosure as described above, there is provided a
mechanism that can improve frequency use efficiency while refi·aining finm using
some of the fi·equency bands of carriers in GFDM. Note that the effects described
above are not necessarily limitative. With or in the place of the above eftects, there
15 may be achieved"any·one of the effects described in this specification or other effects
that may be grasped fi·01n this specification.
20
25
Brief Description of Drawings
(0013]
[FIG. I] FIG. is an expianat01y diagram for describing a technique related to
GFDM.
[FIG. 2] FIG. 2 is an explanatory diagram for describing a technique related to
GFDM.
[FIG. 3] FIG. 3 is an explanatory diagram for describing a technique related to
GFDM.
[FIG. 4] FIG. 4 is a diagram for describing a typical transmission carrier generation
process in LTE.
(FIG. 5] FIG. 5 is a diagram for describing a carrier leak that can happen to an OFDM
earner.
30 [FIG. 6] FIG. 6 is a diagram for describing an example of a spectrum of an OFDM
earner.
I '_j
SP365458WOOO
5/60
[riG. 7] FIG. 7 is a diagram illustrating an example of a configuration of input data
for generating an OFDM modulated wave.
[FIG. 8] FIG. 8 is a diagram illustrating an example of a configuration of input data
for generating a GFDM modulated wave.
5 [FIG. 9] FIG. 9 is a diagram for describing an example of a spectrum of a GFDM
carrier.
[FIG. I 0] FIG. I 0 is an explanatory diagram illustrating an example of a schematic
configuration of a system according to the present embodiment.
[FIG. II] FIG. II is a block diagram illustrating an example of a configuration of a
10 base station according to the present embodiment.
[FIG. 12] FIG. 12 is a block diagram illustrating an example of a configuration of a
terminal apparatus according to the present embodiment.
[riG. 13] FIG. 13 is a diagram for describing an example of a spectnun of a GFDM
carrier according to the present embodiment.
15 [FIG. 1 4] FIG. 1"4 is ·•a ·diagram schematically illustrating a multiplexed resource
according to the present embodiment.
[FIG. 15] FIG. 15 is a diagram for describing an example of a GFDM modulation
process that entails resource multiplexing and is performed by the base station
according to the present embodiment.
20 [FIG. 1 6] FIG. 16 is a diagram illustrating an example of an internal configuration of
a resource generator of the base station according to the present embodiment.
[FIG. 17] FIG. 17 is a diagram illustrating an example of a GFDM modulation
process that entails resource multiplexing and is performed by the base station
according to the present embodiment.
25 [FIG. 1 8] FIG. 18 is a diagram for describing an example of a configuration of first
input data corresponding to a first resource according to the present embodiment.
[FIG. 19] FIG. 19 is a diagram for describing an example of a configuration of second
input data corresponding to a second resource according to the present embodiment.
[FIG. 20] FIG. 20 is a diagram for describing an example of a spectrum of a GFDM
30 carrier corresponding to the first resource according to the present embodiment.
[riG. 21] FIG. 21 is a diagram for describing an example of the configuration of the
I
~
SP365,l58WOOO
6/60
first input data corresponding to the first resource according to the present
embodiment.
[FIG. 22] FIG. 22 is a diagram for describing an example of the spectrum of the
GFDM carrier according to the present embodiment.
5 [FIG. 23] FIG. 23 is a diagram for describing an example of the configuration of the
second input data corresponding to the second resource according to the present
embodiment.
[FIG. 24] FIG. 24 is a diagram for describing an example of a successive GFDM
demodulation process by the terminal apparatus according to the present embodiment.
10 [FIG. 25] FIG. 25 is a diagram for describing an example of signal processing related
to transmission of GFDM signals according to MIMO by the base station according
to the present embodiment.
[FIG. 26] FIG. 26 is a diagram for describing an example of the signal processing
related to the transmission of the GFDM signals according to MIMO by the base
15 station according· to the present embodiment.
[FIG. 27] FIG. 27 is a diagram for describing an example of signal processing related
to reception of GFDM signals according to MIMO by the terminal apparatus
according to the present embodiment.
[FIG. 28] FIG. 28 is a flowchart illustrating an example of a flow of a transmission
20 process executed in the base station according to the present embodiment.
[FIG. 29] FIG. 29 is a flowchatt illustrating an example of a flow of a reception
process executed in a terminal apparatus according to the present embodiment.
[FIG. 30] FIG. 30 is a block diagram illustrating a first example of a schematic
configuration of an eN B.
25 [FIG. 3 I] FIG. 3 I is a block diagram illustrating a second example of a schematic
configuration of an eNB.
[FIG. 32] FIG. 32 is a block diagram illustrating an example of a schematic
configuration of a smattphonc.
[FIG. 33] FIG. 33 is a block diagram illustrating an example of a schematic
30 configuration of a car navigation apparatus.
I -
.
SP3G5458WOOO
7/60
Mode(s) for Carrying Out the Invention
[0014]
Hereinafter, (a) preferred cmbodiment(s) of the present disclosure will be
described in detail with reference to the appended drawings. Note that, in this
5 specification and the appended drawings, structural elements that have substantially
the same function and structure are denoted with the same reference numerals, and
repeated explanation of these structural clements is omitted.
[0015]
Futther, in this specification and the drawings, there arc cases in which
10 clements having substantially the same functional configuration are distinguished by
adding different letters after the same reference numeral. For example, a plurality
of elements having substantially the same functional configuration are distinguished
as terminal apparatuses 200A, 200B, and 200C as necessary. However, when it is
not necessary to patticularly distinguish a plurality of elements having substantially
15 the same functional configuration, only the same reference numeral is attached. For
example, when it is not necessary to pmticularly distinguish terminal apparatuses
200A, 200B and 200C, they are referred to simply as a "terminal apparatus 200."
[0016]
Note that the description will proceed in the following order.
20 I. Introduction
1.1. GFDM
1.2. DC subcarrier
1.3. Technical problem
2. Schematic configuration of system
25 3. Configurations of each apparatus
3.1. Configuration of base station
3.2. Configuration oftennina1 apparatus
4. Technical features
4.1. GFDM modulation/demodulation
30 4.2. Use of bandwidth of unused subcarricr
4.3. Setting information
4.4. Successive demodulation
4.5. Signal processing
4.6. Processing flow
5. Application examples
5 6. Conclusion
[0017]
<>

SP365458WOOO
8/60
First, GFDM will be described with reference to FIGS. I to 3.
10 [0018]
FIG. I is an explanatory diagram for describing a concept of a symbol in
GFDM. A reference numeral 10 indicates resources (which are also referred to as
radio resources. Note that the radio resources cOITespond to a unit resource) per
symbol in OFDM. In the resources indicated by the reference numeral 10, one
15 symbol interval is occupied by a single symbol, and a plurality of subcarriers are
included in a fi·equency direction. Fmthe1; in OFDM, a CP is added to each symbol.
A reference numeral 12 indicates resources of an interval corresponding to one
symbol of OFDM in a single carrier frequency division multiplexing (SC-FDM)
signal. The resources indicated by the reference numeral 12 are exclusively used by
20 a single symbol over a carrier frequency, have a smaller symbol length than that in
OFDM, and include a plurality of symbols in a time direction. A reference numeral
II indicates resources of an interval corresponding to one symbol of OFDM in
GFDM. The resources indicated by the reference numeral II have an intermediate
structure between the resources indicated by the reference numeral I 0 and the
25 resources indicated by the reference numeral 12. In other words, in GFDM, an
interval corresponding to one symbol of OFDM is divided into an arbitrary number
of subsymbols, and the number of subcarriers is smaller than that of OFDM
accordingly. The structure of such resources makes it possible to change the
symbol length in accordance with a parameter and to provide a more flexible
30 transmission format. Note that, in GFDM, it is desirable that the value of the
product of the number of subcarricrs and the number of subsymbols in a unit
5
SP365458WOOO
9/60
resource be a predetermined value. Note that the following also refers to the
number of subcarriers in a unit resource simply as the number of subcarriers. The
same applies to the number of subsymbols.
[0019]
FIG. 2 is a diagram illustrating an example of a configuration example of a
transmission apparatus supporting GFDM. First, if data is input, the transmission
apparatus performs mapping of input data in order to apply filtering corresponding to
the number of subcarriers and the number of subsymbols which are variably set.
Ftuiher, here, the mapping for the subsymbol has an effect equivalent to that when
10 over sampling (up sampling) is performed as compared with OFDM. Then, the
transmission apparatus applies a pulse shaping filter to a predetermined number of
subcarriers and a predetermined number ofsubsymbols (more specificall)\ multiplies
by a predetermined filtering coefficient). Then, the transmission apparatus
performs a frequency-time transform on a waveform after pulse shaping, and
15 generates a 'Symbol. ···Finally, the transmission apparatus adds a CP, applies a digital
to analog converter (DAC), and outputs a radio frequency (RF) signal to a high
fi·equency circuit.
[0020]
Here, GFDM modulation is indicated by the following formula.
20 [0021]
25
[Math. l]
gk.m[n] == g[(n-mK)modN]·exp[jbr; n]
[0022]
[Math. 2]
M-rK-1
x[n]= LLgk,m[n]·dk,m
m:ooOk=O
[0023]
... ( 2)
... ( 1 )
Here, K represents the number of subcarriers, M represents the number of
I
5
SP365458WOOO
10/60
subsymbols, dk,m is input data corresponding to an m-th subsymbol of a k-th
subcarrier, x[n] is an n-th value of N (= KM) pieces of output data, and gk,m[n] is a
coefficient of a filter.
[0024]
The n-th output sample value x[n] of a GFDM symbol is obtained by
summing all values obtained by multiplying the GFDM coefficients corresponding to
the mapped input data. When n varies from 0 to N, the filter coeftlcient varies in
accordance with the above-described formula (2), and a total of N sample values are
obtained per symbol. As a result, a sample value of a time waveform obtained by
10 performing over sampling on the subsymbol K times is generated. In this case, K
times M subsymbols, that is, KM (= N), output values are obtained. The
transmission apparatus performs D/A conversion on the GFDM symbol obtained
accordingly, performs desired amplification and frequency conversion through a high
frequency circuit, and then transmits resulting data from an antenna.
15 [0025]
20
Futihet; for example, a raised cosine (RC) fillet; a root raised cosine (RRC)
filtet; an isotropic orthogonal transfer algorithm (IOTA) filter, or the like can be
employed as the pulse shaping filter.
[0026]
A relation between input data (vector) and output data (vector) in the
formulated GFDM modulation is indicated by a matrix A as in the following formula.
[0027]
[Math. 3]
x=A·d ... ( 3)
25 [0028]
The transformation matrix A is a square matrix including complex elements
having a size ofKM*KM. PIG. 3 is a diagram on which amplitude values (absolute
values) of the elements (that is, filter coefficients) of the transformation matrix A are
plotted. FIG. 3 illustrates a case in which K = 4, M = 7, and an RC filter (a= 0.4) is
30 employed as a prototype filter ofwavefonn shaping.
SP3G5458WOOO
11/60
[0029]
<1.2. DC subcarrier>
In the case where the transmission apparatus adopts a communication method
in which a multicarrier like OFDM or GFDM is used, the transmission apparatus
5 generates a baseband signal typically according to digital signal processing in a
generation process for a transmission carrier, performs digital-to-analog (DA)
conversion, and performs otihogonalmodulation.
[0030]
FIG. 4 is a diagram for describing a typical transmission carrier generation
10 process in LTE. As illustrated in FIG. 4, the transmission apparatus divides a
baseband OFDM signal into a real pati and an imaginary pati, performs ot1hogonal
modulation for combination, and applies an analog filter to generate an OFDM
carrier of a center fi·equency f0. A carrier leak that can happen to this OFDM carrier
will be described with reference to FIG. 5.
15 [0031]
FIG. 5 is a diagram for describing a carrier leak that can happen to an OFDM
carrier. The horizontal axis in FIG. 5 represents frequency, and the vetiical axis
represents, for example, amplitude. As illustrated in FIG. 5, in a spectrum 20 of a
modulated wave to be output, a carrier leak 2 I can happen to the central patt of the
20 bandwidth of an OFDM carrier. In the circuitry of a typical transmission apparatus,
mthogonal modulation is performed by an analog circuit to reduce power to be
consumed. It is a factor of carrier leak occurrence that the non-ideality of the
analog circuit causes a DC offset component. In addition, when a signal component
of a local transmitter is input into an mthogonal modulator, the signal component
25 leaks to an output terminal beyond the isolation between terminals, which is also a
factor of carrier leak occurrence.
[0032]
A subcarrier including a carrier leak is also referred to as DC subcarrier. In a
typical OFDM terminal, the DC subcarrier can be a factor that degrades signal
30 quality and cause reception success probability to decrease. Accordingly, the DC
subcarrier is not used. With reference to FIG. 6, the following describes an OFDM
I .
SP365458WOOO
12/60
carrier.
[0033]
FIG. 6 is a diagram for describing an example of a spectrum of an OFDM
cat1'ier. The horizontal axis in FIG. 6 represents frequency, and the vertical axis
5 represents, for example, amplitude. As illustrated in FIG. 6, a DC subcarrier 22 is
set in the central part of the bandwidth of an OFDM carrier. Spectra 20A and 208
of the modulated wave corresponding to a used subcarrier are generated across the
DC subcarrier 22. To refrain from using the DC subcarrier 22, a transmission
apparatus performs inverse fast Fourier transform (IFFT) transform with the input
10 data corresponding to· the DC subcarrier 22 regarded as having a predetermined value
(e.g., zero), and generates a time wavefonn of an OFDM carrier. In addition, as
illustrated in FIG. 6, guard bands 23 are set at both ends of the bandwidth of an
OFDM carrier. The guard bands 23 are areas for facilitating an anti-aliasing filter to
remove an aliasing distortion component caused when a time wavefonn of an OFDM
15 carrier is subjected to digital-to-analog (DA) conversion. Similarly to the DC
subcarrier 22, the transmission apparatus refrains fi·om using the guard bands 23, so
that the transmission apparatus stores, for example, a predetermined value (e.g., zero)
in the input data corresponding to the guard bands 23.
20
[0034]
FIG. 7 is a diagram illustrating an example of the configuration of input data
for generating an OFDM modulated wave. The input data illustrated in FIG. 7 is
input into an IFFT circuit. As illustrated in FIG. 7, the input data is sectioned into
an area 30 corresponding to a DC subcarrier, an area 31 corresponding to a guard
band, and areas 32A and 32B in which data is stored. An area 24 corresponding to
25 a guard band is divided at the center, and each thereof corresponds to the guard band
23 in FIG. 6. The area 32A in which data is stored corresponds to the spectrum 20A
in FIG. 6. In addition, the area 32B in which data is stored corresponds to the
spectrum 208 in FIG. 6. Predetermined values arc typically stored in the area 30
corresponding to a DC subcarrier and the area 31 corresponding to a guard band. In
30 the case where these predetermined values are zero, it is possible to minimize power
to be consumed.
SP365458WOOO
13/60
[0035]
<1.3. Technical problem>
In GFDM, similarly to OFDM, a transmission apparatus also generates an IQ
baseband signal according to digital signal processing, and performs orthogonal
5 modulation to generate a high-frequency signal. Thus, in GFDM, a carrier leak
similar to that of OFDM can also occur. Therefore, in GFDM, it is also desirable
similarly to OFDM to refrain from using a DC subcarrier.
[0036]
In addition, in GFDM, a pulse shaping filter is used. Accordingly, signal
10 leakage beyond a band is considered to be small, but it is desirable to set a guard
band to remove an aliasing distmiion component produced at the time of DA
conversion. Therefore, in GFDM, it is also desirable similarly to OFDM to refi11in
from using a guard band.
[0037]
15 With Teference to FIG. 8, the following describes an example of the
configuration of GFDM input data in which a DC subcarrier and a guard band are set.
[0038]
FIG. 8 is a diagt·am illustrating an example of the configuration of input data
for generating a GFDM modulated wave. As illustrated in FIG. 8, input data
20 includes M areas 30 corresponding to DC subcarriers, M areas 31 corresponding to
guard bands, and M sets of data sectioned into the areas 32A and 32B in which data
is stored. M corresponds to the number of subsymbols. In GFDM, a unit resource
includes a plurality of subsymbols, so that a DC subcarrier and a guard band arc
inserted for each subsymbol.
25 [0039]
GFDM characteristically has the greater bandwidth of a subcarrier in
reverse proportion to the number of subsymbols because the value of the product of
the number of subcarriers and the number of subsymbols is typically a predetermined
value. Such an increase in the bandwidth of a subcarrier can permit fi·equcncy
30 synchronization accuracy eased more in GFDM than in OFDM. Meanwhile, an
increase in the bandwidth of a subcarrier can decrease the tt·equcncy efficiency of a
I
SP365458WOOO
14/60
carrier. This point will be described in detail with reference to FIG. 9.
[0040]
FIG. 9 is a diagram for describing an example of a spectrum of a GFDM
carrier. The horizontal axis in FIG. 9 represents fi·equency, and the vertical axis
5 represents, for example, amplitude. As illustrated in FIG. 9, a DC subcarrier 22 is
set in the central pmt of the bandwidth of a GFDM carrier. Spectra 20A and 20B of
the modulated wave corresponding to a used subcarricr are generated across the DC
subcarrier 22, and guard bands 23 are set at both ends. A comparison of the DC
subcarrier 22 in FIG. 9 with the DC subcarrier 22 in FIG. 6 shows that the DC
10 subcarrier 22 in FIG. 9 has greater bandwidth. This results from the greater
bandwidth of a subcarricr than that of OFDM, in which, in the case where the
number of subsymbols is more than one, no symbol is divided (i.e., the number of
subsymbols is I).
15
[0041]
In this way,· in GFDM, the bandwidth of DC subcarriers sometimes widens
as compared with OFDM. In that case, the frequency usc efficiency is decreased by
refi·aining from using DC subcarriers. In addition, as illustrated in FIG. 8, in GFDM,
pieces of unused data for DC sub carriers which correspond to sub symbols in number
(e.g., zero) are inse1ted, so that the frequency use efficiency can be fwther decreased.
20 [0042]
<<2. Schematic configuration of system>>
Next, a schematic configuration of a system I according to an embodiment
of the present disclosure will be described with reference to FIG. I 0. FIG. I 0 is an
explanatory diagram illustrating an example of a schematic configuration of the
25 system I according to an embodiment of the present disclosure. Referring to FIG.
I 0, the system I includes a base station I 00 and a terminal apparatus 200. Here, the
terminal apparatus 200 is also referred to as a "user." The user may also be referred
to as "user equipment (UE)." Here, the UE may be UE defined in LTE or L TE-A
or may mean a communication apparatus more generally.
30 [0043]
(I) Base station 100
SP365458WOOO
15/60
The base station 100 is a base station of a cellular system (or a mobile
communication system). The base station I 00 performs wireless communication
with a terminal apparatus (for example, the terminal apparatus 200) located within a
cell 101 of the base station 100. For example, the base station 100 transmits a
5 downlink signal to the terminal apparatus and receives an uplink signal from the
terminal apparatus.
[0044]
(2) Terminal apparatus 200
The terminal apparatus 200 can perform communication m the cellular
10 system (or the mobile communication system). The terminal apparatus 200
performs wireless communication with the base station of the cellular system (for
example, the base station I 00). For example, the terminal apparatus 200 receives a
downlink signal from the base station and transmits an uplink signal to the base
station.
15 [0045]
(3) Multiplexing/multiple access
Patticularly, in an embodiment of the present disclosure, the base station
I 00 performs wireless communication with a plurality of terminal apparatuses via
otthogonal multiple access/non-otthogonal multiple access. More specifically, the
20 base station I 00 performs wireless communication with a plurality of terminal
apparatuses 200 through multiplexing/multiple access using GFDM.
[0046]
For example, the base station I 00 performs wireless communication with a
plurality of terminal apparatuses 200 by multiplexing/multiple access using GFDM
25 in the downlink. More specifically, for example, the base station 100 multiplexes
signals destined for a plurality of terminal apparatuses 200 using GFDM. In this
case, for example, the terminal apparatus 200 removes one or more other signals
serving as interference tl·om a multiplexed signal including a desired signal (that is, a
signal destined for the terminal apparatus 200), and decodes the desired signal.
30 [0047]
The base station I 00 may perform wireless communication with a plurality
I
SP365458WOOO
16/60
of terminal apparatuses by multiplexing/multiple access using GFDM in the uplink
instead of the downlink or together with the downlink. In this case, the base station
I 00 may .decode each of signals fi-om the multiplexed signal including the signals
transmitted fi·om a plurality of terminal apparatuses.
5 [0048]
( 4) Supplemental information
The present technology can also be applied to multi-cell systems such as
heterogeneous networks (HetNet) or small cell enhancement (SCE). Further, the
present technology can also be applied to MTC apparatuses and loT apparatuses.
10 [0049]
<<3. Configuration of each apparatus>>
Next, configurations of the base station I 00 and the terminal apparatus 200
according to the present disclosure will be described with reference to FIGS. II and
12.
15 [0050]
<3.1. Configuration of base station>
First, an example of a configuration of the base station I 00 according to an
embodiment of the present disclosure will be described with reference to FIG. II.
FIG. II is a block diagram illustrating an example of a configuration of the base
20 station 100 according to an embodiment of the present disclosure. Referring to
FIG. II, the base station 100 includes an antenna unit II 0, a wireless communication
unit 120, a network communication unit 130, a storage unit 140, and a processing
unit 150.
[0051]
25 (I) Antenna unit 110
The antenna unit II 0 radiates signals outputted from the wireless
communication unit 120 into space as radio waves. Fwther, the antenna unit II 0
converts radio waves in space into signals, and outputs the signals to the wireless
communication unit 120.
30 [0052]
(2) Wireless communication unit 120
SP365458WOOO
17/60
The wireless communication unit 120 transmits and receives signals. For
example, the wireless communication unit 120 transmits a downlink signal to the
terminal apparatus, and receives an uplink signal from the terminal apparatus.
[0053]
5 (3) Network communication unit 130
The network communication unit 130 transmits and receives information.
For example, the network communication unit 130 transmits information to other
nodes and receives information from the other nodes. Examples of other nodes
include other base stations and core network nodes.
10 [0054]
(4) Storage unit 140
The storage unit 140 temporarily or pennanently stores programs and
various types of data for an operation of the base station 100.
[0055]
15 (5) Processing unit 150
The processing unit 150 provides various functions of the base station 100.
The processing unit 150 includes a setting unit 151, a notification unit 153, and a
transmission processing unit 155. Note that the processing unit 150 may futiher
include components other than these components. In other words, the processing
20 unit 150 may also perform operations other than the operations of these components.
[0056]
The functions of the setting unit 151, the notification unit 153, and the
transmission processing unit 155 will be described below in detail.
[0057]
25 <3.2. Configuration oftenninal apparatus>
First, an example of the configuration of the terminal apparatus 200
according to an embodiment of the present disclosure will be described with
reference to FIG. 12. FIG. 12 is a block diagram illustrating an example of a
configuration of a terminal apparatus 200 according to an embodiment of the present
30 disclosure. Referring to FIG. 12, the terminal apparatus 200 includes an antenna
unit 210, a wireless communication unit 220, a storage unit 230, and a processing
unit 240.
[0058]
(I) Antenna unit 210
SP365458WOOO
18/60
The antenna unit 210 radiates signals outputted from the wireless
5 communication unit 220 into space as radio waves. Further, the antenna unit 210
converts radio waves in space into signals, and outputs the signals to the wireless
communication unit 220.
10
15
[0059]
(2) Wireless communication unit 220
The wireless communication unit 220 transmits and receives signals. For
example, the wireless communication unit 220 receives a downlink signal from the
base station and transmits an uplink signal to the base station.
[0060]
(3) Storage unit 230
The storage unit 230 temporarily or pennanently stores programs and
various types of data for an operation of the terminal apparatus 200.
[0061]
( 4) Processing unit 240
The processing unit 240 provides various functions of the terminal
20 apparatus 200. The processing unit 240 includes an acquisition unit 241 and a
reception processing unit 243. Note that the processing unit 240 may further
include components other than these components. In other words, the processing
unit 240 may also perform operations other than the operations of these components.
[0062]
25 The functions of the acquisition unit 241 and the reception processing unit
243 will be described below in detail.
[0063]
<<4. Technical features>>
Technical features of the present embodiment will be described below under
30 the assumption that the base station I 00 is a transmission apparatus, and the terminal
apparatus 200 is a reception apparatus.
I
'
r/
SP365458WOOO
19/60
[0064]
<4.1. GFDM modulation/demodulation>
The base station I 00 performs GFDM modulation. First, the base station
100 (e.g., setting unit 151) performs resource setting for a unit resource including
5 one or more subcarriers or one or more subsymbols. Specifically, the base station
I 00 variably sets at least any of the number of subcarriers or the number of
subsymbols included in a unit resource. In other words, the base station 100
variably sets at least any of the bandwidth of a subcarrier or the time length of a
subsymbol included in a unit resource. The base station 100 (e.g., transmission
10 processing unit 155) then performs up sampling, and performs filtering for each
subcarrier with a pulse shaping filter (i.e., multiplies a filter coefficient).
[0065]
The terminal apparatus 200 according to the present embodiment receives a
signal subjected to GFDM modulation and transmitted, and performs GFDM
15 demodulation;-· Specifically, the tenninal apparatus 200 (e.g., reception processing
unit 243) receives and demodulates a signal transmitted by variably setting at least
any of the number of subcarriers or the number of subsymbols (i.e., bandwidth of a
subcarrier or time length of a subsymbol) included in a unit resource, and acquires
data. At that time, the terminal apparatus 200 applies the pulse shaping filter
20 corresponding to the pulse shaping filter applied on the transmission side (i.e.,
multiplies a filter coefficient), and performs the down sampling corresponding to the
up sampling applied on the transmission side.
25
[0066]
<4.2. Use of bandwidth of unused subcarricr>
The base station 100 (e.g., transmission processing unit 155) multiples a
used subcarrier of the second resource on an unused subcarrier of the first resource.
The following describes this point in detail.
[0067]
(I) Use of bandwidth of DC subcarrier
30 - Resource multiplexing
The base station I 00 sets, as used subcarriers, at least a pmt of the frequency
SP365458WOOO
20/60
bands corresponding to unused subcarriers of the first resource in the second
resource including a unit resource in which subcarriers has less bandwidth than in the
first resource. This allows at least a part of the .unused subcarriers in the first
resource to be used as used subcarriers in the second resource, and allows the
5 frequency use efficiency to be improved. Note that the less bandwidth of the
subcarriers in the second resource than in the first resource may mean a smaller
number of subsymbols in a unit resource in the second resource than in the first
10
15
resource.
[0068]
For example, the unused subcarriers of the first resource may include the
DC subcarriers of the first resource. In this case, a decrease in frequency use
efficiency caused by the greater bandwidth of the DC subcarriers than that ofOFDM
can be reduced.
[0069]
The··basc ·;iation I 00 sets the frequency band con·esponding to a used
subcarrier of the first resource in the second resource as an unused subcarrier. This
prevents a used subcarrier of the first resource from overlapping with a used
subcarricr of the second resource, and makes it possible to suppress the interference
between these.
20 [0070]
25
The base station 100 stores zero in the unused subcarriers of the first
resource and the second resource. This makes it possible to minimize power to be
consumed as compared with the case where another predetermined value is stored.
[0071]
Here, with reference to FIGS. 13 and 14, an example will be described in
which a used subcarrier of the second resource is multiplexed on a DC subcarrier of
the first resource.
[0072]
FIG. 13 is a diagram for describing an example of a spectrum of a GFDM
30 carrier according to the present embodiment. The horizontal axis in FIG. 13
represents fi·equency, and the ve1tical axis represents, for example, amplitude. FIG.
11
11
SP3G5458WOOO
21/60
13 illustrates spectra 40A and 408 corresponding to the first resource, and spectra
41A and 418 corresponding to the second resource. As illustrated in FIG. 13, DC
subcarriers 42A and 428 are set in the central part of the bandwidth of a GFDM
carrie1; and guard bands 43 are set at both ends. Here, the DC subcarrier 42A is a
5 DC subcarrier of the first resource. As illustrated in FIG. 13, the spectra 41A and
418 corresponding to the second resource are multiplexed on the DC subcarrier 42A
of the first resource. In this way, at least a part of the unused DC subcarriers in the
first resource can be used as used subcarriers in the second resource, which allows
the frequency use efficiency to be improved.
10 [0073]
The DC subcarrier 4213 illustrated in FIG. 13 is a DC subcarrier of the
second resource. In this way, in the second resource, a subcarrier including a can·ier
leak in the central part of a carrier can also be a DC subcarrier, and set as an unused
subcarrier. Here, the base station I 00 performs multiplexing by setting the same
15 center frequency"for ·carriers of the first resource and the second resource. This
allows a local signal leakage component produced when the first resource is
generated to be included in a DC subcarrier of the second resource. Then, the
subcarrier including a local signal leakage component is not still used, so that it is
possible to retain the reception success probability.
20 [0074]
FIG. 14 is a diagram schematically illustrating a multiplexed resource
according to the present embodiment. As illustrated in FIG. 14, once the GFDM
signal corresponding to a first resource 61 is multiplexed on the GFDM signal
corresponding to a second resource 62, the GFDM signal corresponding to a
25 multiplexed resource 63 is generated. As illustrated in FIG. 14, in the first resource
61, the DC subcarrier at the center is not used, but the remainder is a used subcarrier.
In addition, in the second resource 62, in the subcarrier corresponding to a DC
subcarrier of the first resource 61, the DC subcarrier at the center is not used, but the
remainder is a used subcarrier. Fu1thcr, in the second resource 62, the subcarrier
30 corresponding to a used subcarrier of the first resource 61 is not used.
[0075]
SP36M58WOOO
22/60
For the sake of simplicity here, as a GFDM carrier, a unit resource having a
subsymbollength of 50 us and a subcarrier bandwidth of20 kHz when the number of
subsymbols is I and the number of subcarriers is 9 is conceived as a standard. In
this case, the bandwidth of the GFDM carrier is I 80 kHz. As illustrated in FIG. I 4,
5 in the first resource 6I, the number ofsubsymbols is 3 and the number ofsubcarriers
is 3, so that the bandwidth of the subcarriers is 20 kHz. Meanwhile, in the second
resource, the number of subsymbols is I and the number of subcarriers is 9, so that
the bandwidth of the subcarriers is 60 kHz. Thus, in the first resource 61, a
bandwidth of 60 kHz is not used. The multiplexing of the second resource 62
10 reduces unused bandwidth to 20 kHz in the multiplexed resource 63. In this way,
fi·equeney use efficiency is improved. Needless to say, the number of subsymbols
of the second resource does not have to be I, but may be, for example, 2 or more.
[0076]
As illustrated in FIG. 14, it is desirable that the number of subcarriers of a
15 unit resource"included·in the second resource be an odd number. In that case, the
number of DC subcarriers in the second resource is one. Accordingly, it is possible
to minimize a decrease in frequency efficiency. In addition, as illustrated in FIG. 14,
it is desirable that the bandwidth of a subcarrier of a unit resource included in the
first resource be an integer multiple of the bandwidth of a subcarrier of a unit
20 resource included in the second resource. According to this condition, unused
subcarriers of the first resource are compensated by the same number of used
subcarriers of the second resource. Here, as illustrated in FIG. 14, the product of the
number of subcarriers and the number of subsymbols is considered to be the same
between a unit resource included in the first resource and a unit resource included the
25 second resource. In that case, the above-described condition can also be said to
means that the numbet· of subcarriers of a unit resource included in the second
resource is an integer multiple of the number of subcarriers of a unit resource
included in the first resource. Needless to say, as long as the above-described
condition is satisfied, the product of the number of subcarriers and the number of
30 subsymbols may be different between a unit resource included in the first resource
and a unit resource included in the second resource.
SP365458WOOO
23/60
[0077]
- GFDM modulation that entails resource multiplexing
The base station 100 performs GFDM modulation that entails resource
multiplexing. Specifically, the base station 100 performs filtering on and
5 multiplexes each of the first resource and the second resource for each subcarrier.
10
With reference to FIGS. 15 to 17, the following describes an example of signal
processing for the base station 100 to multiplex the first resource and the second
resource as described above.
[0078]
FIG. 15 is a diagram for describing an example of a GFDM modulation
process that entails resource multiplexing and is performed by the base station 100
according to the present embodiment. As illustrated in FIG. 15, the base station 100
includes a first resource generator 160A, a second resource generator 1608, a local
oscillator 170, an adder 171, an RF amplifier 172, and an antenna 173. First, the
15 first resource·generator 160A generates a GFDM signal from input data I (i.e., first
input data stored in the first resource) on the basis of the resource setting of the first
resource. Meanwhile, the second resource generator 1608 generates a GFDM
signal from input data 2 (i.e., second input data stored in the second resource) on the
basis of the resource setting of the second resource. Here, the first resource
20 generator 160A and the second resource generator I 608 receive the same local
signals output fi·om the same local oscillator 170. This causes carriers of the first
resource and the second resource to have the same center frequency. The base
station 100 then uses the adder 171 to add (i.e., multiplex) the GFDM signal output
from each of the first resource generator 160A and the second resource generator
25 1608, and generates the GFDM carrier illustrated in FIG. 13. Then, the base station
I 00 amplifies the generated GFDM carrier with the RF amplifier 172 for
transmission from the antenna 173.
[0079]
Note that the antenna 173 may correspond to the antenna unit II 0, the RF
30 amplifier 172 may correspond to the wireless communication unit 120, and the other
components may correspond to the transmission processing unit I 55. Needless to
I
r ..
SP3G5458WOOO
24/60
say, components may also correspond to any other components.
[0080]
Next, with reference to FIG. 16, the internal configuration of a resource
generator 160 will be described. Note that the first resource generator 160A and the
5 second resource generator 1608 have the same internal configuration. In the case
where there is no need to pmticularly distinguish these, they will be generically
referred to as resource generator 160.
[0081]
FIG. 16 is a diagram illustrating an example of the internal configuration of
10 the resource generator 160 of the base station I 00 according to the present
embodiment. As illustrated in FIG. 16, the resource generator includes a GFDM
modulator 161, an IQ splitter 162, DA converters 163A and 1638, Low-pass filters
(LPFs) 164A and 1648, multipliers 165A and 1658, and an adder 166. First, the
resource generator 160 modulates input data with the GFDM modulator 161 to
15 generate a·GFDM signal. As a premise, on the basis of the number ofsubsymbols
indicated by the resource setting, zero data corresponding to a DC subcarrier and a
guard band is considered to be insetted into input data. The resource generator 160
maps the input data to a unit resource including a number of subsymbols and a
number of subcarriers indicated by the resource setting, and applies a pulse shaping
20 filter to generate a GFDM signal. The pulse shaping filter is applied in accordance
with the formulas (I) to (3) above. The resource generator 160 then applies the IQ
splitter 162 to the generated GFDM signal to split the generated GFDM signal into
an I component or a Q component, and converts each of them by using the DA
converter 163 to remove an aliasing distmtion component with the LPF 164. Then,
25 the resource generator 160 uses the multiplier 165A to multiply the I component by a
local signal and uses the multiplier 1658 to multiply the Q component by a local
signal whose phase is shifted by 90 degrees. The resource generator 160 adds each
of them with the adder 166 to perform mthogonalmodulation.
30
[0082]
The above describes an example of the GFDM modulation process. In the
examples illustrated in FIGS. 15 and 16, the base station I 00 individually generates
SP365458WOOO
25/60
the can·iers corresponding to the first resource and the second resource, and adds
them in intermediate frequency (IF) frequency. In contrast, as illustrated in FIG. 17,
a configuration example is also conceivable in which each of 1/Q signals is added in
the baseband, and ot1hogonal modulation is then performed.
5 [0083]
FIG. 17 is a diagram illustrating an example of a GFOM modulation process
that entails resource multiplexing and is performed by the base station 100 according
to the present embodiment. As illustrated in FIG. 17, the base station I 00 includes
GFOM modulators 161A and 1618, 1Q splitters 162A and 1628, OA convetters
10 163A to 1630, LPFs 164A to 1640, adders 166A to 166C, and multipliers 165A and
165B. First, the base station 100 modulates each of first input data and second
input data with the GFOM modulator 161A or 1618 to generate GFOM signals.
Then, the base station 100 applies the IQ splitter 162A or 1628 to each of the GFOM
signals to split each of the GFOM signals into an I component or a Q component, and
15 converts thn-espective components with the OA converters 163A to 1630 to remove
aliasing distotiion components with the LPFs 164A to 1640. The base station 100
then adds the each of the I components or the Q components of the GFOM signals of
the first input data and the second input data with the adder 1 66A or 1668, and
performs otthogonal modulation on them with the multipliers 165A and 1658, and
20 the adder 166C.
[0084]
-Input data
Next, with reference to FIGS. 18 and 19, the first input data and the second
input data will be described in detail.
25 [0085]
FIG. 18 is a diagram for describing an example of the configuration of first
input data stored in the first resource according to the present embodiment. As
illustrated in FIG. 18, the first input data includes M areas 50 corresponding to DC
subcarriers, M areas 51 corresponding to guard bands, and M sets of data sectioned
30 into the areas 52A and 528 in which data is stored. M corresponds to the number of
subsymbols. Each area 52A in which data is stored corresponds to the spectrum
I
SP3G5458WOOO
26/60
4oA corresponding to the first resource in FIG. 13. In addition, each area 52B in
which data is stored corresponds to the spectrum 40B corresponding to the first
resource in FIG. 13. As illustrated in FIG. 18, the number M of subsymbols in the
first resource is a plural number (e.g., I 0).
5 [0086]
FIG. 19 is a diagram for describing an example of the configuration of the
second input data that is stored in the second resource according to the present
embodiment. As illustrated in FIG. 19, the second input data includes the area 50
corresponding to a DC subcarrier, the area 51 corresponding to a guard band, the
10 areas 52A and 52B in which data is stored, and areas 53 A and 53B corresponding to
NULL subcarriers. Each area 52A in which data is stored corresponds to the
spectrum 41A corresponding to the second resource in FIG. I 3. In addition, each
area 52B in which data is stored corresponds to the spectrum 41 B corresponding to
the first resource in FIG. 13. The NULL subcarrier refers to an unused subcarrier
15 that is set except ·fur ·a DC subcarrier or a guard band. The areas 53A and 53B
corresponding to NULL subcarriers are areas that correspond to the fi·equency bands
(i.e., spectra 40A and 4oB) corresponding to used subcarriers of the first resource in
the second resource, and, for example, zero is stored therein. As illustrated in FIG.
19, the number M of subsymbols in the second resource is I.
20 [0087]
(2) Usc of bandwidth of NULL sub carrier
For example, the unused subcarriers of the first resource may include a
subcarrier around the DC subcarriers of the first resource. That is, the base station
I 00 may set any number of subcarriers around a DC subcarrier of the first resource
25 as NULL subcarriers, and set at least a part of the NULL subcarriers as used
subcarriers in the second resource. In this case, it is possible to secure more used
subcarriers in the second resource. With reference to FIG. 20, the following
describes an example of the spectrum of the GFDM carrier corresponding to the first
resource in this case. Next, with reference to FIG. 2 I, an example of the
30 corresponding first input data will be described.
[0088]
I •If.·
SP365458WOOO
27/60
FIG. 20 is a diagram for describing an example of a spectrum of a GFDM
carrier corresponding to the first resource according to the present embodiment.
The horizontal axis in l'IG. 20 represents frequency, and the vertical axis represents,
for example, amplitude. As illustrated in FIG. 20, a DC subcarrier 42 is set in the
5 central part of the bandwidth of a GFDM carrier, and NULL subcarriers 44A and
44B are set on both sides of the DC subcarrier 42. Then, the spectra 40A and 40B
of the modulated waves corresponding to used subcarriers are generated across the
NULL subcarriers 44A and 44B, and the guard bands 43 are set at both ends.
10
[0089]
FIG. 2 I is a diagram for describing an example of the configuration of the
first input data stored in the first resource according to the present embodiment. As
illustrated in FIG. 21, the first input data includes M sets of data sectioned into the
areas 50 corresponding to DC subcarriers, the areas 5 I corresponding to guard bands,
the areas 52A and 52B in which data is stored, and the areas 53A and 53B
15 corresponding; to NULL subcarriers. M corresponds to the number of subsymbols.
Note that each of the areas 53 A corresponding to NULL subcarriers corresponds to
the NULL subcarrier 44A in FIG. 20. In addition, each of the areas 53B
corresponding to NULL subcarriers corresponds to the NULL subcarrier 44B in FIG.
20.
20 [0090]
(3) Use of bandwidth of guard band
An unused subcarrier of the first resource may include a guard band. For
example, the base station I 00 may set at least a part of the guard bands of the first
resource as a used subcarrier in the second resource. In this case, it is possible to
25 secure more used subcarriers in the second resource. With reference to FIG. 22, the
following describes an example of the spectrum of the GFDM carrier in this case.
Next, with reference to FIG. 23, an example of the corresponding second input data
will be described.
30
[009 I l
FIG. 22 is a diagram for describing an example of the spectrum of the
GFDM carrier according to the present embodiment. The horizontal axis in FIG. 22
SP365458WOOO
28/60
represents fi·equency, and the vcr1ical axis represents, for example, amplitude. FIG.
22 illustrates spectra 40A and 40B corresponding to the first resource, and spectra
41 A to 41 D corresponding to the second resource. As illustrated in FIG. 22, DC
subcarriers 42A and 42B arc set in the central pm1 of the bandwidth of a GFDM
5 carrier; and guard bands 43 are set at both ends. Here, the DC subcarrier 42A is a
DC subcarrier of the first resource. The DC subcarricr 42B is a DC subcarrier of
the second resource. As illustrated in FIG. 22, the spectra 41 A and 41 B
corresponding to the second resource are multiplexed on the DC subcarrier 42A of
the first resource. Ftu1her, as illustrated in FIG. 22, the spectra 41C and 41D
10 corresponding to the second resource are multiplexed on a part of the guard bands 43
of the first resource. In this way, at least a pari of the unused guard bands in the
first resource can be used as used subcarriers in the second resource, which allows
the fi·equency use efficiency to be improved.
15
[0092]
FIG. 23 is a diagram for describing an example of the configuration of the
second input data that is stored in the second resource according to the present
embodiment. As illustrated in FIG. 23, the second input data includes M sets of
data sectioned into the areas 50 corresponding to DC subcarriers, the areas 51
corresponding to guard bands, the areas 52A to 52D in which data is stored, and the
20 areas 53A and 53B corresponding to NULL subcarriers. M corresponds to the
number of subsymbols. Note that each area 52A in which data is stored
corresponds to the spectrum 41 A corresponding to the second resource in FIG. 22.
Each area 52B in which data is stored corresponds to the spectrum 41 B
corresponding to the second resource in FIG. 22. Each area 52C in which data is
25 stored corresponds to the spectrum 41 C corresponding to the second resource in FIG.
22. Each area 52D in which data is stored corresponds to the spectrum 41 D
corresponding to the second resource in FIG. 22. The respective areas 53 A and 53B
corresponding to NULL subcarriers are areas that correspond to the frequency bands
(i.e., spectra 40A and 41 B) corresponding to used subcarriers of the first resource in
30 the second resource, and, for example, zero is stored therein.
[0093]
I
,/'
SP365458WOOO
29/60
Note that the unused subcarriers of the first resource may include the
subcarriers around the guard band of the tirst resource. That is, the base station I 00
may set any number of subcarriers around a guard band of the first resource as
NULL subcarriers, and set at least a part of the NULL subcarriers as used subcarriers
5 in the second resource. In this case, it is possible to secure more used subcarriers in
the second resource.
10
[0094]
<4.3. Setting information>
(I) Notification of setting information
The base station 100 (e.g., notification unit 153) notifies another apparatus
(e.g., terminal apparatus 200) of setting information indicating the setting related to
the first resource and the second resource. The terminal apparatus 200 (e.g.,
acquisition unit 241) acquires the setting information fi·om the base station I 00, and
then can demodulate the first resource and the second resource.
15 [0095]
The setting information can include infonnation indicating the resource
setting of each ofthe first resource and the second resource. In addition, the setting
information can include information indicating a used subcarrier and an unused
subcarrier of each of the first resource and the second resource. In addition, the
20 setting information can include information indicating destinations of the first
resource and the second resource.
[0096]
For a notification of the setting information fi·om the base station I 00 to the
terminal apparatus 200, for example, system information can be used. Besides, an
25 individual signaling message such as radio resource control (RRC) signaling may be
used.
[0097]
Here, an example of the allocation of the first resource and the second
resource will be described. For example, frequency synchronization accuracy that
30 is eased more is desirable for a terminal such as a machine-type-communication
(MTC) terminal that includes simplified hardware. Accordingly, it is desirable to
I
SP365458WOOO
30/60
allocate the first resource in which subcarriers have greater bandwidth. Meanwhile,
the second resource may be allocated to a small amount of data that does not require
low delay, but follows data transmitted and received in the first resource. Note that
the destinations of the first resource and the second resource may be the same or
5 different.
[0098]
(2) Change in setting information
The base station I 00 (e.g., setting unit 151) can change the resource setting
of unit resources included in the first resource and/or the second resource. For
10 example, the base station I 00 (e.g., setting unit 151) may change the setting of a unit
resource included in the second resource along with a change in the setting of a unit
resource included in the first resource. In the case where the setting is changed, the
base station 100 (e.g., notification unit 153) can notify the terminal apparatus 200 of
the changed setting information. Then, the terminal apparatus 200 (e.g., acquisition
15 unit 241) acquires the changed setting information, and reflects it in the
demodulation process.
[0099]
Note that, in the case where the setting related to the first resource and the
second resource is changed, the base station 100 (e.g., notification unit 153) may
20 issue a notification of the changed setting information of each of the first resource
and the second resource, or only the changed setting infonnation of the first resource.
In the latter case, the terminal apparatus 200 (e.g., reception processing unit 243)
complies with a predefined change rule to change the setting of the second resource
on the basis of a change in the setting of the first resource. The base station I 00
25 notifies the terminal apparatus 200 of this change rule in advance.
[0 I 00]
<4.4. Successive demodulation>
The terminal apparatus 200 (e.g., reception processing unit 243)
demodulates the first resource and the second resource. At that time, the terminal
30 apparatus 200 can perform successive demodulation with successive interference
cancellation (SIC) technology, which is a demodulation technique for multiplexed
SP365458WOOO
31/60
signals. This point will be described in detail with reference to FIG. 24.
[0101]
FIG. 24 is a diagram for describing an example of a successive GFDM
demodulation process by the terminal apparatus 200 according to the present
5 embodiment. As illustrated in FIG. 24, the terminal apparatus 200 includes a
receiver 251, a first GFDM demodulator 252A, a second GFDM demodulator 2528,
and an adder 253. The terminal apparatus 200 first inputs a carrier received by the
receiver 251 into the first GFDM demodulator 252A to demodulate the first resource.
If signal power provided to the first resource is sufficiently greater than signal power
10 provided to the second resource, a signal transmitted in the first resource in
demodulation has desired quality. Next, the terminal apparatus 200 uses the adder
253 to subtract the carrier component related to the first resource from the carrier
received by the receiver 251. Then, the terminal apparatus 200 inputs the signal
subjected to the subtraction into the second GFDM demodulator 2528 to demodulate
15 the second·Te~;ource. This allows a second resource signal having relatively small
energy to be more accurately demodulated. In this way, data stored in the first
resource and data stored in the second resource arc each output.
[0 I 02]
Note that the receiver 251 may correspond to the wireless communication
20 unit 220, and the other components may correspond to the reception processing unit
243. Of course, any other correspondence relation is acceptable.
[0 103]
<4.5. Signal processing>
Next, signal processing for GFDM signals will be described.
25 [0104]
(I) Signal processing related to transmission of GFDM signal
First, with reference to FIGS. 25 and 26, signal processing related to the
transmission of a GFDM signal by the base station 100 will be described.
[0 I 05]
30 FIG. 25 is a diagram for describing an example of the signal processing
related to the transmission of a GFDM signal by the base station I 00 according to the
SP365458WOOO
32/60
present embodiment. The configuration illustrated in FIG. 25 is an example of the
internal configuration of the GFDM modulator 161 illustrated in FIGS. 16 and 17.
As illustrated in FIG. 25, the base station I 00 performs forward error correction
(FEC) coding, rate matching, scrambling, interleaving, and mapping (constellation
5 mapping) from a bit string to a symbol (which may be, for example, a complex
symbol or may also be referred to as a signal point) on input data.
[0 I 06]
The base station I 00 performs a GFDM modulation process on the complex
data obtained in this way. Specifically, the base station I 00 first maps the complex
10 data to a resource in accordance with the number K of subcarriers and the number M
of subsymbols indicated by GFDM setting information. Next, the base station I 00
applies a pulse shaping filter to mapped input data dk,m[n] to obtain output data x[n]
as shown in the formula (2) above. The base station I 00 then generates a symbol in
the time domain. Specifically, the base station I 00 performs parallel-serial
15 cmwersion on·the"output data x[n] to obtain a GFDM symbol in the time domain,
that is, a GFDM time waveform.
20
[0 I 07]
In this way, a GFDM codeword X[n] is output.
[0108]
Note that each component illustrated in FIG. 25 may correspond to the
transmission processing unit 155. Of course, any other correspondence relation is
acceptable.
[0 I 09]
The above describes an example of the signal processing related to the
25 transmission of a GFDM signal. Next, the signal processing related to the
transmission of GFDM signal in the case of MIMO will be described with reference
to FIG. 26.
[0 II OJ
-Case of multiple-input and multiple-output (MIMO)
30 FIG. 26 is a diagram for describing an example of signal processing related
to the transmission of GFDM signals according to MIMO by the base station I 00
!
SP365458WOOO
33/60
according to the present embodiment. FIG. 26 illustrates an example of the case
where the process described above with reference to FIG. 17 is performed to
multiplex the first resource and the second resource. As illustrated in FIG. 26, the
base station I 00 performs FEC encoding, rate matching, scrambling, interleaving,
5 and mapping from a bit string to a symbol for each pieces of transmission data to be
multiplexed. Then, the base station I 00 performs multiplexing through
transmission layer mapping and performs pre coding for each multiplexed signal. A
subsequent process is performed for each multiplexed signal.
10
[0 Ill]
The base station I 00 maps complex data to the first resource or the second
resource in accordance with the number K of subcarriers and the number M of
subsymbols indicated by GFDM setting information. The following processes have
been described above with reference to FIG. 17. Specifically, the base station 100
performs GFDM modulation on each of the mapped first resource and second
15 resource to· generate a GFDM signal. Next, the base station I 00 splits the IQ
component of each GFDM signal, adds each of the I components or the Q
20
components, and performs Oiihogonal modulation on the signals of the added l
components and the signals of the added Q components.
[0112]
Then, the base station I 00 uses an analog FE to perform signal processing
on the GFDM signals subjected to the 01thogonal modulation, and transmits wireless
signals from an antenna.
[0 113]
Note that the analog FE may correspond to the wireless communication unit
25 120, the antenna may correspond to the antenna unit II 0, and the other components
may correspond to the transmission processing unit 155. Of course, any other
correspondence relation is acceptable.
[0 114]
(2) Signal processing related to reception of GFDM signal
30 Next, with reference to FIG. 27, signal processing related to the reception of
a GFDM signal by the terminal apparatus 200 will be described. Here, the case of
SP365458WOOO
34/60
MIMO will be described as an example.
[0 115]
FIG. 27 is a diagram for describing an example of the signal processing
related to the reception of GFDM signals according to MIMO by the terminal
5 apparatus 200 according to the present embodiment. As illustrated in FIG. 27, the
terminal apparatus 200 uses an analog FE to perform signal processing on a signal
received by an antenna, uses an analog-to-digital converter (ADC) to perform AD
conversion, and performs successive GFDM demodulation (Successive GFDM
Demod #1, #2). The successive GFDM demodulation has been described above
10 with reference to FIG. 24. Data stored in the first resource (#I) and data stored in
the second resource (#2) are each output. In the GFDM demodulator that
demodulates each of the first resource and the second resource, the terminal
apparatus 200 extracts original data d[O] to data d[N-1] fi·om the received symbols
x[O] to x[N-1]. To this end, the GFDM demodulator may be a circuit that multiplies
15 a conjugate··tnmspose matrix A11 of A which is matching filter reception for the
transformation matrix A of the GFDM used for transmission, a circuit that multiplies
an inverse matrix kr serving as zero force reception, a minimum mean square error
(MMSE) reception circuit, or the like. Thereafter; the terminal apparatus 200
performs MIMO equalization and de-mapping of the transmission layec Thereafter;
20 the terminal apparatus 200 performs de-interleaving, de-scrambling, rate matching,
and FEC decoding on each piece of reception data and outputs the resulting data.
[0 116]
Note that the analog FE may correspond to the wireless communication unit
220, the antenna may correspond to the antenna unit 210, and the other components
25 may correspond to the reception processing unit 243. Of course, any other
correspondence relation is acceptable.
[0 117]
<4.6. Processing tlow>
Next, the processing flow of the base station I 00 and the terminal apparatus
30 200 will be described with reference to FIGS. 28 and 29.
[0 118]
I
If • SP365458WOOO
35/60
FIG. 28 is a flowchart illustrating an example of the flow of the transmission
process executed in the base station I 00 according to the present embodiment. As
illustrated in FIG. 28, the base station I 00 first performs resource setting (i.e., setting
of subsymbol length and setting of subcarrier frequency, or the number of subcarriers
5 and the number of subsymbols in a unit resource) for the first resource (step S I 02).
Then, the base station I 00 performs the resource setting of the second resource such
that the bandwidth of a subcarrier is less than that of the first resource (step S I 04).
Next, the base station 100 sets at least a patt of the frequency bands corresponding to
the unused subcarriers in the first resource as a used subcarrier of the second
10 resource (stepS 106). Then, the base station 100 notifies the terminal apparatus 200
of the setting information (step S I 08). Next, the base station I 00 stores data in the
unused subcarriers of the first resource and the second resource (step S 110). Then,
the base station I 00 performs the transmission signal processing described above, for
example, with reference to FIGS. 15 to 17, and riGS. 25 and 26 (step Sll2), and
15 transmits a ·signal (step S 114).
[0119]
FIG. 29 is a flowchart illustrating an example of the flow of reception
processing executed in the terminal apparatus 200 according to the present
embodiment. As illustrated in FIG. 29, the terminal apparatus 200 first acquires
20 setting information of which the terminal apparatus 200 is notified by the base station
I 00 (step S202). Then, the terminal apparatus 200 performs the reception signal
processing described above with reference to FIGS. 24 and 27 on the basis of the
setting information (step S204), and acquires data stored in the first resource and/or
the second resource (step S206).
25 [0120]
<<5. Application examples>>
The technology according to the present disclosure is applicable to various
products. The base station 100 may also be implemented, for example, as any type
of evolved Node B (eN B) such as macro eNBs and small eNBs. Small eNBs may
30 be eNBs that cover smaller cells than the macrocells, such as pica eNBs, micro eNBs,
or home (femto) eNBs. Instead, the base station 100 may be implemented as
I
' r/ '
'
SP365458WOOO
36/60
another type of base station such as Nodes B or base transceiver stations (BTSs),
The base station I 00 may include the main apparatus (which is also referred to as
base station apparatus) that controls wireless communicatiorLand one or more remote
radio heads (RRHs) that are disposed at different locations from that of the main
5 apparatus. Also, various types of terminals described below may function as the
base station 100 by temporarily or semi-permanently executing the functionality of
the base station. Furthermore, at least some of structural elements of the base
station I 00 may be realized in a base station apparatus or a module for a base station
apparatus.
10 [0121]
Further, the terminal apparatus 200 may be implemented, for example, as a
mobile terminal such as smartphones, tablet personal computers (PCs), notebook PCs,
portable game terminals, portable/dongle mobile routers, and digital cameras, or an
in-vehicle terminal such as car navigation apparatuses. Further, the terminal
15 apparatus 200···may be implemented as a machine type communication (MTC)
terminal for establishing a machine to machine (M2M) communication.
Furthermore, at least some of structural elements of the terminal apparatus 200 may
be implemented as a module (e.g., integrated circuit module including a single die)
that is mounted on these terminals.
20 [0122]
<5.1. Application examples for base station>
(First application example)
FIG. 30 is a block diagram illustrating a first example of a schematic
configuration of an eNB to which the technology according to the present disclosure
25 may be applied. An cNB 800 includes one or more antennas 810 and a base station
apparatus 820. Each antenna 810 and the base station apparatus 820 may be
connected to each other via an RF cable.
[0 123]
Each of the antennas 810 includes a single or a plurality of antenna elements
30 (e.g., a plurality of antenna clements constituting a MIMO antenna) and is used for
the base station apparatus 820 to transmit and receive a wireless signal. The eNB
SP365458WOOO
37/60
800 may include the plurality of the antennas 810 as illustrated in FIG. 30, and the
plurality of antennas 810 may, for example, correspond to a plurality of frequency
bands used by the eNB 800. It should be noted that while FIG. 30 illustrates an
example in which the eNB 800 includes the plurality of antennas 810, the eNB 800
5 may include the single antenna 810.
10
[0 124]
The base station apparatus 820 includes a controller 821, a memory 822, a
network interface 823, and a wireless communication interface 825.
[0 125]
The controller 821 may be, for example, a CPU or a DSP, and operates
various functions of an upper layer of the base station apparatus 820. For example,
the controller 821 generates a data packet fium data in a signal processed by the
wireless communication interface 825, and transfers the generated packet via the
network interface 823. The controller 821 may generate a bundled packet by
15 bundling data ·from ·a ··plurality of baseband processors to transfer the generated
bundled packet. Futther, the controller 821 may also have a logical function of
performing control such as radio resource control, radio bearer control, mobility
management, admission control, and scheduling. Futiher, the control may be
perfonned in cooperation with a surrounding eNB or a core network node. The
20 memory 822 includes a RAM and a ROM, and stores a program executed by the
controller 821 and a variety of control data (such as, for example, terminal list,
transmission power data, and scheduling data).
[0 126]
The network interface 823 is a communication interface for connecting the
25 base station apparatus 820 to the core network 824. The contmller 821 may
communicate with a core network node or another eNB via the network interface 823.
In this case, the eNB 800 may be connected to a core network node or another eNB
through a logical interface (e.g., S I interface or X2 interface). The network
interface 823 may be a wired communication interface or a wireless communication
30 interface for wireless backhaul. In the case where the network interface 823 is a
wireless communication interface, the network interface 823 may use a higher
I
SP365458WOOO
38160
frequency band for wireless communication than a frequency band used by the
wireless communication interface 825.
[0 127]
The wireless communication interface 825 supports a cellular
5 communication system such as long term evolution (LTE) or LTE-Advanced, and
provides wireless connection to a terminal located within the cell of the eNB 800 via
the antenna 810. The wireless communication interface 825 may typically include a
baseband (BB) processor 826, an RF circuit 827, and the like. The BB processor
826 may, for example, perform encoding/decoding, modulation/demodulation,
10 multiplexing/demultiplexing, and the like, and performs a variety of signal
processing on each layer (e.g., Ll, medium access control (MAC), radio link control
(RLC), and packet data convergence protocol (PDCP)). The BB processor 826 may
have part or all of the logical functions as described above instead of the controller
821. The BB processor 826 may be a module including a memory having a
15 communicatiorn:ontrol program stored therein, a processor to execute the program,
and a related circuit, and the function of the BB processor 826 may be changeable by
updating the program. Furthet; the module may be a card or blade to be inserted
into a slot of the base station apparatus 820, or a chip mounted on the card or the
blade. Meanwhile, the RF circuit 827 may include a mixer, a filter, an amplifier,
20 and the like, and transmits and receives a wireless signal via the antenna 810.
[0 128]
The wireless communication interface 825 may include a plurality of the BB
processors 826 as illustrated in FIG. 30, and the plurality of BB processors 826 may,
for example, correspond to a plurality of frequency bands used by the eNB 800.
25 Flllther, the wireless communication interface 825 may also include a plurality of the
RF circuits 827, as illustrated in FIG. 30, and the plurality ofRF circuits 827 may, for
example, correspond to a plurality of antenna elements. Note that FIG. 30
illustrates an example in which the wireless communication interface 825 includes
the plurality of BB processors 826 and the plurality of RF circuits 827, but the
30 wireless communication interface 825 may include the single BB processor 826 or
the single RF circuit 827.
I r· .
SP365458WOOO
39/60
[0129]
In the eNB 800 illustrated in FIG 30, one or more components (the setting
unit 151, the notification unit 153, and/or the transmission processing unit 155)
included in the processing unit 150 described with reference to FIG II may be
5 implemented in the wireless communication interface 825. Alternatively, at least
some of these structural elements may be implemented by the controller 821. As an
example, a module which includes a pati (for example, the BB processor 826) or all
of the wireless communication interface 825 and/or the controller 821 may be
mounted in the eNB 800, and the one or more structural elements may be
10 implemented by the module. In this case, the module may store a program for
causing the processor to function as the one or more structural elements (i.e., a
program for causing the processor to execute operations of the one or more structural
elements) and may execute the program. As another example, the program for
causing the processor to function as the one or more structural elements may be
15 installed iwthe eNB·SOO, and the wireless communication interface 825 (for example,
the BB processor 826) and/or the controller 821 may execute the program. As
described above, the eNB 800, the base station apparatus 820, or the module may be
provided as an apparatus which includes the one or more structural elements, and the
program for causing the processor to function as the one or more structural elements
20 may be provided. In addition, a readable recording medium in which the program
is recorded may be provided.
[0 130]
In addition, in the eNB 800 illustrated in FIG 30, the wireless
communication unit 120 described with reference to FIG 5 may be implemented by
25 the wireless communication interface 825 (for example, the RF circuit 827).
Moreover, the antenna unit 110 may be implemented by the antenna 810. In
addition, the network communication unit 130 may be implemented by the controller
821 and/or the network interface 823. Further, the storage unit 140 may be
implemented by the memory 822.
30 [0131]
(Second application example)
I
IIft/
SP365458WOOO
40/60
FIG. 3 I is a block diagram illustrating a second example of a schematic
configuration of an eNB to which the technology according to the present disclosure
may be applied. An eNB 830 includes one or more antennas 840, a base station
apparatus 850, and an RRH 860. Each of the antennas 840 and the RRH 860 may
5 be connected to each other via an RF cable. Further, the base station apparatus 850
and the RRH 860 may be connected to each other by a high speed line such as optical
tiber cables.
[0132]
Each of the antennas 840 includes a single or a plurality of antenna elements
10 (e.g., antenna elements constituting a MIMO antenna), and is used for the RRH 860
to transmit and receive a wireless signal. The eNB 830 may include a plurality of
the antennas 840 as illustrated in FIG. 31, and the plurality of antennas 840 may, for
example, correspond to a plurality of frequency bands used by the eNB 830. Note
that FIG. 31 illustrates an example in which the eNB 830 includes the plurality of
15 antennas 840, but the eNB 830 may include the single antenna 840.
[0133]
The base station apparatus 850 includes a controller 851, a memory 852, a
network interface 853, a wireless communication interface 855, and a connection
interface 857. The controller 851, the memory 852, and the network interface 853
20 are similar to the controller 821, the memory 822, and the network interface 823
described with reference to FIG. 30.
[0134]
The wireless communication interface 855 supports a cellular
communication system such as L:rE and LTE-Advanced, and provides wireless
25 connection to a terminal located in a sector corresponding to the RRH 860 via the
RRH 860 and the antenna 840. The wireless communication interface 855 may
typically include a BB processor 856 or the like. The BB processor 856 is similar
to the BB processor 826 described with reference to FIG. 30 except that the BB
processor 856 is connected to an RF circuit 864 of the RRH 860 via the connection
30 interface 857. The wireless communication interface 855 may include a plurality of
the BB processors 856, as illustrated in FIG. 31, and the plurality of BB processors
I
SP365458WOOO
41/60
856 may, for example, correspond to a plurality of fi·equency bands used by the eNB
830. Note that FIG. 31 illustrates an example in which the wireless communication
interface 855 includes the plurality of BB processors 856, but the wireless
communication interface 855 may include the single BB processor 856.
5 [0135]
The connection interface 857 is an interface for connecting the base station
apparatus 850 (wireless communication interface 855) to the RRH 860. The
connection interface 857 may be a communication module for communication on the
high speed line which connects the base station apparatus 850 (wireless
10 communication interface 855) to the RRH 860.
[0136]
Fmiher, the RRH 860 includes a connection interface 861 and a wireless
communication interface 863.
[0137]
15 The· connection interface 861 is an interface for connecting the RRH 860
20
(wireless communication interface 863) to the base station apparatus 850. The
connection interface 861 may be a communication module for communication on the
high speed line.
[0138]
The wireless communication interface 863 transmits and receives a wireless
signal via the antenna 840. The wireless communication interface 863 may
typically include the RF circuit 864 or the like. The RF circuit 864 may include a
mixer, a filter, an amplifier and the like, and transmits and receives a wireless signal
via the antenna 840. The wireless communication interface 863 may include a
25 plurality of the RF circuits 864 as illustrated in FIG. 31, and the plurality of RF
circuits 864 may, for example, correspond to a plurality of antenna elements. Note
that FIG. 31 illustrates an example in which the wireless communication interface
863 includes the plurality of RF circuits 864, but the wireless communication
interface 863 may include the single Rf circuit 864.
30 [0139]
In the eNB 830 illustrated in FIG. 31, one or more components (the setting
i
If/
I
SP365458WOOO
42/60
unit 151, the notification unit 153, and/or the transmission processing unit 155)
included in the processing unit 150 described with reference to FIG. II may be
implemented in the wireless communication interface 855 and/or the wireless
communication interface 863. Alternatively, at least some of these structural
5 elements may be implemented by the controller 851. As an example, a module
which includes a pati (for example, the BB processor 856) or all of the wireless
communication interface 855 and/or the controller 851 may be mounted in the eNB
830, and the one or more structural elements may be implemented by the module.
In this case, the module may store a program for causing the processor to function as
10 the one or more structural elements (i.e., a program for causing the processor to
execute operations of the one or more structural elements) and may execute the
program. As another example, the program for causing the processor to function as
the one or more structural elements may be installed in the eNB 830, and the wireless
communication interface 855 (for example, the BB processor 856) and/or the
15 controller 851· may "execute the program. As described above, the eNB 830, the
base station apparatus 850, or the module may be provided as an apparatus which
includes the one or more structural elements, and the program for causing the
processor to function as the one or more structural elements may be provided. In
addition, a readable recording medium in which the program is recorded may be
20 provided.
[0 140]
In addition, in the eNB 830 illustrated in FIG. 31, for example, the wireless
communication unit 120 described with reference to FIG. 5 may be implemented by
the wireless communication interface 863 (for example, the RF circuit 864).
25 Moreover, the antenna unit II 0 may be implemented by the antenna 840. In
addition, the network communication unit 130 may be implemented by the controller
85 I and/or the network interface 853. Fmther, the storage unit 140 may be
implemented by the memory 852.
(0 I 41]
30 <5.2. Application examples for terminal apparatus>
(First application example)
SP365458WOOO
43/60
FIG. 32 is a block diagram illustrating an example of a schematic
configuration of a smmtphone 900 to which the technology according to the present
disclosure may .be applied. The smartphone 900 includes a processor 90I, a
memory 902, a storage 903, an external connection interface 904, a camera 906, a
5 sensor 907, a microphone 908, an input device 909, a display device 910, a speaker
911, a wireless communication interface 912, one or more antenna switches 915, one
or more antennas 9 I 6, a bus 9 I 7, a battery 918, and an auxiliary controller 919.
[0142]
The processor 90 l may be, for example, a CPU or a system on chip (SoC),
10 and controls the functions of an application layer and other layers of the sma11phone
900. The memory 902 includes a RAM and a ROM, and stores a program executed
by the processor 90 l and data. The storage 903 may include a storage medium such
as semiconductor memories and hard disks. The external connection interface 904
is an interface for connecting the smm1phone 900 to an externally attached device
15 such as memory-cards and universal serial bus (USB) devices.
[0143]
The camera 906 includes, for example, an image sensor such as charge
coupled devices (CCDs) and complementary metal oxide semiconductor (CMOS),
and generates a captured image. The sensor 907 may include a sensor group
20 including, for example, a positioning sensor, a gyro sensor, a geomagnetic sensor, an
acceleration sensor and the like. The microphone 908 converts a sound that is input
into the smartphone 900 to an audio signal. The input device 909 includes, for
example, a touch sensor which detects that a screen of the display device 91 0 is
touched, a key pad, a keyboard, a button, a switch or the like, and accepts an
25 operation or an information input from a user. The display device 91 0 includes a
screen such as liquid crystal displays (LCDs) and organic light emitting diode
(OLEO) displays, and displays an output image of the sma.tphone 900. The
speaker 911 converts the audio signal that is output from the smm1phone 900 to a
sound.
30 [0144]
The wireless communication interface 912 supports a cellular
I
SP3G5458WOOO
44/60
communication system such as LTE or LTE-Advanced, and performs wireless
communication. The wireless communication intert:1ce 912 may typically include
the BB processor 913, the RF circuit 914, and the like. The BB processor 913 may,
for example, perform encoding/decoding, modulation/demodulation,
5 multiplexing/demultiplexing, and the like, and performs a variety of types of signal
processing for wireless communication. On the other hand, the RF circuit 914 may
include a mixer, a filter, an amplifier, and the like, and transmits and receives a
wireless signal via the antenna 916. The wireless communication interface 912 may
be a one-chip module in which the BB processor 913 and the RF circuit 914 are
10 integrated. The wireless communication interface 912 may include a plurality of
BB processors 913 and a plurality ofRF circuits 914 as illustrated in FIG. 32. Note
that FIG. 32 illustrates an example in which the wireless communication interface
912 includes a plurality ofBB processors 913 and a plurality ofRF circuits 914, but
the wireless communication interface 912 may include a single BB processor 913 or
15 a single RF circuit 914. ·" ·
[0 145]
Furiher, the wireless communication interface 912 may suppori other types
of wireless communication system such as a shari range wireless communication
system, a near field communication system, and a wireless local area network (LAN)
20 system in addition to the cellular communication system, and in this case, the
wireless communication interface 912 may include the BB processor 913 and the RF
circuit 914 for each wireless communication system.
[0 146]
Each antenna switch 915 switches a connection destination of the antenna
25 916 among a plurality of circuits (for example, circuits for different wireless
communication systems) included in the wireless communication interface 912.
[0147]
Each of the antennas 916 includes one or more antenna elements (for
example, a plurality of antenna elements constituting a MIMO antenna) and is used
30 for transmission and reception of the wireless signal by the wireless communication
interface 912. The smartphone 900 may include a plurality of antennas 916 as
./I 11
5
SP365458WOOO
45/60
illustrated in FIG. 32. Note that FIG. 32 illustrates an example in which the
smmiphone 900 includes a plurality of antennas 916, but the smatiphone 900 may
include a single antenna 916.
[0 148]
Fut1her, the smart phone 900 may include the antenna 916 for each wireless
communication system. In this case, the antenna switch 915 may be omitted fi·om a
configuration of the smatiphone 900.
[0 149]
The bus 917 connects the processor 90 I, the memory 902, the storage 903,
10 the external connection interface 904, the camera 906, the sensor 907, the
microphone 908, the input device 909, the display device 910, the speaker 911, the
wireless communication interface 912, and the auxiliary controller 919 to each other.
The battery 918 supplies electric power to each block of the smatiphone 900
illustrated in FIG. 32 via a feeder line that is partially illustrated in the figure as a
15 dashed line. ·The auxiliary controller 919, for example, operates a minimally
necessary function of the smatiphone 900 in a sleep mode.
[0150]
In the smattphone 900 illustrated in FIG. 32, one or more structural elements
included in the processing unit 240 (the acquisition unit 241 and/or the reception
20 processing unit 243) described with reference to FIG. 12 may be implemented by the
wireless communication interface 912. Alternatively, at least some of these
structural elements may be implemented by the processor 90 I or the auxiliary
controller 919. As an example, a module which includes a pmi (for example, the
BB processor 913) or all of the wireless communication interface 912, the processor
25 90 I, and/or the auxiliary controller 919 may be mounted in the smartphone 900, and
the one or more structural elements may be implemented by the module. In this
case, the module may store a program for causing the processor to function as the
one or more structural elements (i.e., a program for causing the processor to execute
operations of the one or more structural elements) and may execute the program.
30 As another example, the program for causing the processor to function as the one or
more structural elements may be installed in the smmtphone 900, and the wireless
SP365458WOOO
46/60
communication interface 912 (for example, the BB processor 913), the processor 90 l,
and/or the auxiliary controller 919 may execute the program. As described above,
the smattphone 900 or the module may be provided as an apparatus which includes
the one or more structural elements, and the program for causing the processor to
5 function as the one or more structural elements may be provided. In addition, a
readable recording medium in which the program is recorded may be provided.
[0 151]
In addition, in the smmtphone 900 illustrated in FIG. 32, for example, the
wireless communication unit 220 described with reference to riG. 12 may be
10 implemented by the wireless communication interface 912 (for example, the RF
circuit 914). Moreover, the antenna unit 210 may be implemented by the antenna
916. Fmthet~ the storage unit 230 may be implemented by the memory 902.
15
[0 152]
(Second application example)
FIG. ·"33 is a block diagram illustrating an example of a schematic
configuration of a car navigation apparatus 920 to which the technology according to
the present disclosure may be applied. The car navigation apparatus 920 includes a
processor 921, a memory 922, a global positioning system (GPS) module 924, a
sensor 925, a data interface 926, a content player 927, a storage medium interface
20 928, an input device 929, a display device 930, a speaker 931, a wireless
communication interface 933, one or more antenna switches 936, one or more
antennas 937, and a battery 938.
[0153]
The processor 921 may be, for example, a CPU or an SoC, and controls the
25 navigation function and the other functions of the car navigation apparatus 920.
The memory 922 includes a RAM and a ROM, and stores a program executed by the
processor 921 and data.
[0 154]
The GPS module 924 uses a GPS signal received from a GPS satellite to
30 measure the position (e.g., latitude, longitude, and altitude) of the car navigation
apparatus 920. The sensor 925 may include a sensor group including, for example,
SP365458WOOO
47/60
a gyro sensor, a geomagnetic sensor, a barometric sensor and the like. The data
interface 926 is, for example, connected to an in-vehicle network 941 via a terminal
that is not illustrated, and acquires data such as vehicle speed data generated on the
vehicle side.
5 [0155]
The content player 927 reproduces content stored in a storage medium (e.g.,
CD or DVD) insetied into the storage medium interface 928. The input device 929
includes, for example, a touch sensor which detects that a screen of the display
device 930 is touched, a button, a switch or the like, and accepts operation or
10 information input fi·om a user. The display device 930 includes a screen such as
LCDs and OLEO displays, and displays an image of the navigation function or the
reproduced content. The speaker 931 outputs a sound of the navigation function or
the reproduced content.
15
[0156]
The ··wireless ··t:ommunication interface 933 supports a cellular
communication system such as LTE or LTE-Advanced, and perfonns wireless
communication. The wireless communication interface 933 may typically include
the BB processor 934, the RF circuit 935, and the like. The BB processor 934 may,
for example, perform encoding/decoding, modulation/demodulation,
20 multiplexing/demultiplexing, and the like, and performs a variety of types of signal
processing for wireless communication. On the other hand, the RF circuit 935 may
include a mixet~ a filter, an amplifier, and the like, and transmits and receives a
wireless signal via the.antenna 937. The wireless communication interface 933 may
be a one-chip module in which the BB processor 934 and the RF circuit 935 are
25 integrated. The wireless communication interface 933 may include a plurality of
BB processors 934 and a plurality ofRF circuits 935 as illustrated in FIG. 33. Note
that FIG. 33 illustrates an example in which the wireless communication interface
933 includes a plurality of BB processors 934 and a plurality of RF circuits 935, but
the wireless communication interface 933 may include a single BB processor 934 or
30 a single RF circuit 935.
[0 157]
SP365458WOOO
48/60
Further, the wireless communication interface 933 may suppmt other types
of wireless communication system such as a shmt range wireless communication
system, a near field communication system, and a wireless LAN system in addition
to the cellular communication system, and in this case, the wireless communication
5 interface 933 may include the BB processor 934 and the RF circuit 935 for each
wireless communication system.
[0158]
Each antenna switch 936 switches a connection destination of the antenna
937 among a plurality of circuits (for example, circuits for different wireless
10 communication systems) included in the wireless communication interface 933.
[0159]
Each of the antennas 937 includes one or more antenna elements (for
example, a plurality of antenna elements constituting a MlMO antenna) and is used
for transmission and reception of the wireless signal by the wireless communication
15 interface 933. · · The·car navigation apparatus 920 may include a plurality of antennas
937 as illustrated in FIG. 33. Note that FIG. 33 illustrates an example in which the
car navigation apparatus 920 includes a plurality of antennas 937, but the car
navigation apparatus 920 may include a single antenna 937.
[0 160]
20 Fmther, the car navigation apparatus 920 may include the antenna 937 for
each wireless communication system. In this case, the antenna switch 936 may be
omitted fium a configuration of the car navigation apparatus 920.
[0 161]
The battery 938 supplies electric power to each block of the car navigation
25 apparatus 920 illustrated in FIG. 33 via a feeder line that is partially illustrated in the
figure as a dashed line. Fmther, the battery 938 accumulates the electric power
supplied from the vehicle.
[0 162]
In the car navigation apparatus 920 illustrated in FIG. 33, one or more
30 structural elements included in the processing unit 240 (the acquisition unit 241
and/or the reception processing unit 243) described with reference to FIG. 12 may be
/
SP365458WOOO
49/60
implemented by the wireless communication interface 933. Alternatively, at least
some of these structural clements may be implemented by the processor 92I. As an
example, a module which includes a patt (for example, the BB processor 934) or all
of the wireless communication interface 933 and/or the processor 921 may be
5 mounted in the car navigation apparatus 920, and the one or more structural elements
may be implemented by the module. In this case, the module may store a program
for causing the processor to function as the one or more structural elements (i.e., a
program for causing the processor to execute operations of the one or more structural
elements) and may execute the program. As another example, the program for
10 causing the processor to function as the one or more structural elements may be
installed in the car navigation apparatus 920, and the wireless communication
interface 933 (for example, the BB processor 934) and/or the processor 92I may
execute the program. As described above, the car navigation apparatus 920 or the
module may be provided as an apparatus which includes the one or more structural
15 elements, and· the· program for causing the processor to function as the one or more
structural elements may be provided. In addition, a readable recording medium in
which the program is recorded may be provided.
[0 I63]
In addition, in the car navigation apparatus 920 illustrated in FIG 33, for
20 example, the wireless communication unit 220 described with reference to FIG. 12
may be implemented by the wireless communication interface 933 (for example, the
RF circuit 935). Moreover, the antenna unit 210 may be implemented by the
antenna 937. Ftllther, the storage unit 230 may be implemented by the memory 922.
[0 164]
25 The technology of the present disclosure may also be realized as an invehicle
system (or a vehicle) 940 including one or more blocks of the car navigation
apparatus 920, the in-vehicle network 941, and a vehicle module 942. That is, the
in-vehicle system (or a vehicle) 940 may be provided as an apparatus including the
acquisition unit 24I and the reception processing unit 243. The vehicle module 942
30 generates vehicle data such as vehicle speed, engine speed, and trouble information,
and outputs the generated data to the in-vehicle network 941.
SP365458WOOO
50/60
[0165]
<<6. Conclusion>>
An embodiment of the present disclosure has been described above in detail
with reference to FIGS. I to 33. As described above, the base stations I 00 variably
5 sets at least any of bandwidth of a subcarrier or time length of a subsymbol included
in a unit resource including one or more subcarriers or one or more subsymbols, and
sets, as a used subcarrier, at least a part of a frequency band corresponding to an
unused subcarrier of a fir·st resource in a second resource including the unit resource
in which the bandwidth of the subcarrier is less than in the first resource. This
10 allows at least a part of the unused subcarriers in the first resource to be used as used
subcarriers in the second resource, and allows the frequency use efficiency to be
improved.
[0166]
In addition, carriers of the first resource and the second resource may have
15 the same center· frequency. This allows a local signal leakage component produced
when the first resource is generated to be included in a DC subcarrier of the second
resource. Then, the subcarrier including a local signal leakage component is not
still used, so that it is possible to retain the reception success probability.
20
[0 167]
The preferred embodiment(s) of the present disclosure has/have been
described above with reference to the accompanying drawings, whilst the present
disclosure is not limited to the above examples. A person skilled in the art may find
various alterations and modifications within the scope of the appended claims, and it
should be understood that they will naturally come under the technical scope of the
25 present disclosure.
[0168]
For example, in the above-described embodiment, the example has been
described in which the two resources including the first resource and the second
resource arc multiplexed. However, the present technology is not limited to such an
30 example. For example, three or more resources may be multiplexed.
[0 169]
SP365458WOOO
51/60
In addition, in the above embodiment, it has been described that the base
station I 00 is the transmission apparatus, and the terminal apparatus 200 is the
reception apparatus has been described, but the present technology is not limited to
this example. For example, the terminal apparatus 200 may be the transmission
5 apparatus, and the base station I 00 may be the reception apparatus. In addition, the
present technology is not limited to communication between the base station and the
terminal, but the present technology is also applicable, for example, to device-todevice
(D2D) communication, vehicle-to-X (V2X) communication, and the like.
10
15
20
[0 170]
Further; the processes described using the flowcharts in this specification
need not be necessarily executed in the described order. Several process steps may
be executed in parallel. Fm1her; an additional process step may be employed, and
some process steps may be omitted.
[0 17 []
Further, the effects described in this specification are merely illustrative or
exemplified effects, and are not limitative. That is, with or in the place of the above
effects, the technology according to the present disclosure may achieve other effects
that are clear to those skilled in the art from the description of this specification.
[0 172]
Additionally, the present technology may also be configured as below.
(I)
An apparatus including:
a processing unit configured to variably set at least any of bandwidth of a
subcarrier or time length of a subsymbol included in a unit resource including one or
25 more subcarriers or one or more subsymbols, and set, as a used subcarrier, at least a
part of a frequency band corresponding to an unused subcarrier of a first resource in
a second resource including the unit resource in which the bandwidth of the
subcarrier is less than in the first resource.
(2)
30 The apparatus according to (I), in which
carriers of the first resource and the second resource have same center
I
SP3G5458WOOO
52/60
fi·equency.
(3)
The apparatus according to (I) or (2), in which
the unused subcarrier of the first resource includes a DC subcarricr of the
5 first resource.
(4)
The apparatus according to any one of (I) to (3), in which
the unused subcarrier of the first resource includes a subcarrier around a DC
subcarrier of the first resource.
10 (5)
15
20
25
30
The apparatus according to any one of(!) to (4), in which
the unused sub carrier of the first resource includes a guard band.
(6)
The apparatus according to any one of (I) to (5), in which
the·· bandwidth of the subcan-ier of the unit resource included in the first
resource is an integer multiple of the bandwidth of the subcarrier of the unit resource
included in the second resource.
(7)
The apparatus according to (6), in which
a product of the number of subcarriers and the number of subsymbols is
same between the unit resource included in the first resource and the unit resource
included in the second resource.
(8)
The apparatus according to (7), in which
the number of subcarriers of the unit resource included in the second
resource is an integer multiple of the number of subcarriers of the unit resource
included in the first resource.
(9)
The apparatus according to (6), in which
a product of the number of subcarriers and the number of subsymbols is
different between the unit resource included in the first resource and the unit resource
.
;·:·'···· ..• •• il
SP365458WOOO
53/60
included in the second resource.
(10)
The apparatus according to any one of(!) to (9), in which
the number of subcarriers of the unit resource included in the second
5 resource is an odd number.
(II)
The apparatus according to any one of(l) to (10), in which
the processing unit sets, as an unused subcarrier, a frequency band
corresponding to a used subcarrier of the first resource in the second resource.
10 (12)
15
20
25
The apparatus according to any one of (I) to (II), in which
the processing unit stores zero in unused subcarriers of the first resource and
the second resource.
(13)
The·apparatus according to any one of (I) to (12), in which
the processing unit notifies another apparatus of information indicating
setting of the first resource and the second resource.
(14)
The apparatus according to (13), in which
the processing unit changes setting of the unit resource included in the
second resource along with a change in setting of the unit resource included in the
first resource.
(15)
The apparatus according to any one of(l) to (14), in which
the processing unit performs filtering on the first resource and the second
resource for each subcarrier.
(16)
An apparatus including:
a processing unit configured to demodulate a tlrst resource and a second
30 resource in which at least any of bandwidth of a subcarrier or time length of a
subsymbol included in a unit resource including one or more subcarriers or one or
I
' r .
.
SP365458WOOO
54/60
more subsymbols is variably set, in which
the bandwidth of the subcarrier is less in the second resource than in the first
resource, and at least a part of a frequency band con·esponding to an unused
subcarrier of the first resource is set as a used subcarrier.
5 (17)
A method including:
variably setting at least any of bandwidth of a subcarrier or time length of a
subsymbol included in a unit resource including one or more subcarriers or one or
more subsymbols, and setting, by a processor, as a used subcarricr, at least a part of a
10 frequency band corresponding to an unused subcarrier of a first resource in a second
resource including the unit resource in which the bandwidth of the subcarrier is less
than in the first resource.
15
(18)
A method including:
demodulating, by a processor, a first resource and a second resource in
which at least any of bandwidth of a subcarrier or time length of a subsymbol
included in a unit resource including one or more subcarriers or one or more
subsymbols is variably set, in which
the bandwidth of the subcarrier is less in the second resource than in the first
20 resource, and at least a pati of a frequency band corresponding to an unused
subcarrier of the first resource is set as a used subcarrier.
Reference Signs List
[0 173]
25 system
100 base station
ll 0 antenna unit
120 wireless communication unit
130 network communication unit
30 140 storage unit
!50 processing unit
SP365458WOOO
55/60
151 setting unit
153 notification unit
155 transmission processing unit
200 terminal apparatus
5 210 antenna unit
220 wit'eless communication unit
230 storage unit
240 processing unit
241 acquisition unit
10 243 reception processing unit
SP3G5458WOOO
56/60
CLAIMS
Claim 1
An apparatus comprising:
a processing unit configured to variably set at least any of bandwidth of a
5 subcarrier or time length of a subsymbol included in a unit resource including one or
more subcarriers or one or more subsymbols, and set, as a used subcarrie1; at least a
pmi of a frequency band corresponding to an unused subcarrier of a first resource in
a second resource including the unit resource in which the bandwidth of the
subcarrier is less than in the first resource.
10
15
20
25
Claim2
The apparatus according to claim 1, wherein
carriers of the first resource and the second resource have same center
frequency.
Claim 3
The apparatus according to claim 1, wherein
the unused subcarrier of the first resource includes a DC subcarrier of the
first resource.
Claim4
The apparatus according to claim 1, wherein
the unused subcarrier of the first resource includes a subcarrier around a DC
subcarrier of the first resource.
Claim 5
The apparatus according to claim 1, wherein
the unused subcarrier of the first resource includes a guard band.
30 Claim 6
The apparatus according to claim 1, wherein
SP3G5458WOOO
57/60
the bandwidth of the subcarrier of the unit resource included in the first
resource is an integer multiple of the bandwidth of the subcarrier of the unit resource
included in the second resource.
5 Claim 7
10
The apparatus according to claim 6, wherein
a product of the number of subcarriers and the number of subsymbols is
same between the unit resource included in the first resource and the unit resource
included in the second resource.
Claim 8
The apparatus according to claim 7, wherein
the number of subcarriers of the unit resource included in the second
resource is an integer multiple of the number of subcarricrs of the unit resource
15 included in the first resource.
Claim 9
The apparatus according to claim 6, wherein
a product of the number of subcarriers and the number of subsymbols is
20 different between the unit resource included in the first resource and the unit resource
included in the second resource.
25
Claim 10
The apparatus according to claim I, wherein
the number of subcarriers of the unit resource included in the second
resource is an odd number.
Claim II
The apparatus according to claim I, wherein
30 the processing unit sets, as an unused subcarrie•; a frequency band
corresponding to a used subcarrier of the first resource in the second resource.
SP365,158WOOO
58/60
Claim 12
The apparatus according to claim I, wherein
the processing unit stores zero in unused subcarriers of the first resource and
5 the second resource.
Claim 13
The apparatus according to claim I, wherein
the processing unit notifies another apparatus of information indicating
10 setting of the first resource and the second resource.
Claim 14
The apparatus according to claim 13, wherein
the processing unit changes setting of the unit resource included in the
15 second resource along, with a change in setting of the unit resource included in the
first resource.
20
25
Claim 15
The apparatus according to claim I, wherein
the processing unit performs filtering on the first resource and the second
resource for each subcarrier.
Claim 16
An apparatus comprising:
a processing unit configured to demodulate a first resource and a second
resource in which at least any of bandwidth of a subcarrier or time length of a
subsymbol included in a unit resource including one or more subcarriers or one or
more subsymbols is variably set, wherein
the bandwidth of the subcarrier is less in the second resource than in the first
30 resource, and at least a pmt of a ti·equcncy band corresponding to an unused
subcarrier of the first resource is set as a used subcarrier.
.~.c .. ·.;.·;··
~
SP365458WOOO
59/60
Claim I 7
A method comprising:
variably setting at least any of bandwidth of a subcarrier or time length of a
5 subsymbol included in a unit resource including one or more subcarriers or one or
more subsymbols, and setting, by a processor, as a used subcarrier, at least a part of a
frequency band corresponding to an unused subcarrier of a first resource in a second
resource including the unit resource in which the bandwidth of the subcarrier is less
than in the first resource.
10
Claim 18
A method comprising:
demodulating, by a processor, a first resource and a second resource in
which at least any of bandwidth of a subcarrier or time length of a subsymbol
15 included in ·a ""unit· resource including one or more subcarriers or one or more
subsymbols is variably set, wherein
20
the bandwidth of the subcarrier is less in the second resource than in the first
resource, and at least a pmt of a frequency band corresponding to an unused
subcarrier of the first resource is set as a used subcarrier.