CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of Japanese Priority Patent Application JP
2014-250717 filed December 11, 2014, the entire contents of which are incorporated
herein by reference.
Technical Field
[0002] The present disclosure relates to a communication control apparatus, a radio commu
nication apparatus, a communication control method, a radio communication method,
and a program.
Background Art
[0003] The number of users in cellular systems has significantly increased. Accordingly,
systems of 5th Generation have been increasingly demanded. Shifting from 4th
Generation to 5th Generation demands some breakthroughs (e.g., improvement of both
spectral efficiency and energy efficiency, and advanced radio frequency domain
processing).
[0004] In cellular systems, scheduling of radio resources is performed for the purpose of
avoiding interference between users, improving communication quality, and improving
throughput. This scheduling has generally been performed every minimum
transmission time interval (TTI), for example, in accordance with the communication
environment at that time. Regarding this point, in long term evolution (LTE) and LTEadvanced
(A), semi-persistent scheduling (SPS) has been standardized as a technology
for scheduling radio resources in NPLs 1 and 2 below. SPS is a technology capable of
allocating radio resources to user equipment (UE) at time intervals longer than one
subframe. Note that the minimum TTI is 1ms (one subframe) in LTE.
[0005] In terms of improving spectral efficiency, a multiple access technology (MAT) is an
important element. As one of multiple access technologies, non-orthogonal multiple
access (NOMA), such as interleave division multiple access (IDMA), has been at
tracting attention. Regarding IDMA, technologies related to interleaver allocation have
been developed for the purpose of distinguishing between different users and e f
fectively eliminating interference between the users to improve communication c a
pability. For example, PTL 1 below discloses a technology of using different interleave
patterns for different users or different cells to improve communication capability.
Citation List
Patent Literature
[0006] PTL 1: JP 2004-194288A
Non Patent Literature
[0007] NPL 1: 3GPP, "3GPP TS 36.321 vl2.3.0", September 23, 2014.
NPL 2: 3GPP, "3GPP TS 36.331 vl2.3.0", September 23, 2014.
Summary
Technical Problem
[0008] The above-described SPS is a technology having been standardized for the purpose
of reducing overhead for resource allocation in each minimum TTI. For example, in
LTE and LTE-A, downlink allocation messages or uplink grant messages are
exchanged every subframe on a control channel. Thus, frequent interactions on the
control channel cause high overhead in some cases. This can also occur in IDMA
systems.
[0009] An embodiment of the present disclosure provides a novel and improved commu
nication control apparatus, radio communication apparatus, communication control
method, radio communication method, and program that are capable of reducing
overhead related to interleaver allocation in an IDMA system.
Solution to Problem
[0010] According to an embodiment of the present disclosure, there is provided a commu
nication control apparatus including: a communication unit configured to perform
communication with a radio communication apparatus of a communication system in
which interleave division multiple access (IDMA) is used; and an interval control unit
configured to dynamically change an interval of allocation of an interleaver used for
IDMA by the radio communication apparatus.
[001 1] According to an embodiment of the present disclosure, there is provided a radio com
munication apparatus including: a radio communication unit configured to perform
radio communication using IDMA with another radio communication apparatus; and a
control unit configured to control the radio communication unit to cause the radio com
munication unit to perform interleave processing using an interleaver allocated at an
interval that is dynamically changed.
[0012] According to an embodiment of the present disclosure, there is provided a commu
nication control method including: performing communication with a radio commu
nication apparatus of a communication system in which IDMA is used; and d y
namically changing, by a processor, an interval of allocation of an interleaver used for
IDMA by the radio communication apparatus.
[0013] According to an embodiment of the present disclosure, there is provided a radio com
munication method including: performing radio communication using IDMA with
another radio communication apparatus; and performing control, by a processor, to
cause interleave processing using an interleaver allocated at an interval that is d y
namically changed to be performed.
[0014] According to an embodiment of the present disclosure, there is provided a program
causing a computer to function as: a communication unit configured to perform com
munication with a radio communication apparatus of a communication system in
which IDMA is used; and an interval control unit configured to dynamically change an
interval of allocation of an interleaver used for IDMA by the radio communication
apparatus.
[0015] According to an embodiment of the present disclosure, there is provided a program
causing a computer to function as: a radio communication unit configured to perform
radio communication using IDMA with another radio communication apparatus; and a
control unit configured to control the radio communication unit to cause the radio com
munication unit to perform interleave processing using an interleaver allocated at an
interval that is dynamically changed.
Advantageous Effects of Invention
[0016] As described above, according to an embodiment of the present disclosure, overhead
related to interleaver allocation in an IDMA system can be reduced. Note that the
effects described above are not necessarily limited, and along with or instead of the
effects, any effect that is desired to be introduced in the present specification or other
effects that can be expected from the present specification may be exhibited.
Brief Description of Drawings
[0017] [fig.l]FIG. 1 is an explanatory diagram for describing a technology related to IDMA.
[fig.2]FIG. 2 is an explanatory diagram for describing a technology related to IDMA.
[fig.3]FIG. 3 is an explanatory diagram for describing a technology related to IDMA.
[fig.4]FIG. 4 is an explanatory diagram for describing a technology related to IDMA.
[fig.5]FIG. 5 is a view illustrating an example of the entire configuration of a commu
nication system according to an embodiment of the present disclosure
[fig.6]FIG. 6 is a block diagram illustrating an example of a logical configuration of a
communication control apparatus according to the present embodiment.
[fig.7]FIG. 7 is an explanatory diagram for describing interleaver allocation policies
according to the present embodiment.
[fig.8]FIG. 8 is a block diagram illustrating an example of a logical configuration of a
terminal apparatus according to the present embodiment.
[fig.9]FIG. 9 is a block diagram illustrating an example of a logical configuration of a
radio communication unit of a terminal apparatus according to the present em
bodiment.
[fig.lO]FIG. 10 is a sequence diagram illustrating an example of the flow of noti
fication processing of allocation information executed in a communication system
according to the present embodiment.
[fig. 11]FIG. 11 is a flowchart illustrating an example of the flow of setting processing
of an interleaver allocation interval executed in a communication control apparatus
according to the present embodiment.
[fig.l2]FIG. 12 is an explanatory diagram for describing resource allocation in
OFDMA.
[fig.l3]FIG. 13 is an explanatory diagram for describing resource allocation when
OFDMA and IDMA are combined.
[fig.l4]FIG. 14 is an explanatory diagram for describing resource allocation when
OFDMA and IDMA are combined.
[fig.l5]FIG. 15 is a block diagram illustrating an example of a schematic configuration
of a server.
[fig.l6]FIG. 16 is a block diagram illustrating a first example of a schematic con
figuration of an eNB.
[fig.l7]FIG. 17 is a block diagram illustrating a second example of a schematic con
figuration of an eNB.
[fig.l8]FIG. 18 is a block diagram illustrating an example of a schematic configuration
of a smartphone.
[fig.l9]FIG. 19 is a block diagram illustrating an example of a schematic configuration
of a car navigation apparatus.
Description of Embodiments
[0018] Hereinafter, preferred embodiments of the present disclosure will be described in
detail with reference to the appended drawings. Note that, in this specification and the
appended drawings, structural elements that have substantially the same function and
structure are denoted with the same reference signs, and repeated explanation of these
structural elements is omitted.
[0019] Note that, in this specification and the appended drawings, elements that have sub
stantially the same function and structure are sometimes distinguished from each other
using different alphabets after the same reference sign. For example, if necessary,
elements that have substantially the same function and structure (e.g., terminal ap
paratuses 200A, 200B, and 200C) are distinguished from each other. However, when it
is not particularly necessary to distinguish elements that have substantially the same
function and structure, the same reference sign alone is attached. For example, when it
is not particularly necessary to distinguish the terminal apparatuses 200A, 200B, and
200C from each other, each apparatus is simply called a terminal apparatus 200.
[0020] Description is given in the following order.
1. Introduction
2. Configuration
2.1. Example Configuration of Communication System
2.2. Example Configuration of Communication Control Apparatus
2.3. Example Configuration of Terminal Apparatus
3. Function Details
4. Operation Processing
5. Modification Examples
6. Application Examples
7. Conclusion
[0021] <1. Introduction>
First, technologies related to IDMA are described with reference to FIGS. 1 to 4.
FIGS. 1 to 4 are explanatory diagrams for describing the technologies related to
IDMA.
[0022] Non-orthogonal multiple access has been attracting attention as one of 5G radio
access technologies following long term evolution (LTE)/LTE-advanced (LTE-A).
[0023] In orthogonal frequency division multiple access (OFDMA) or single-carrier FDMA
(SC-FDMA) adopted in LTE, radio resources are allocated so as not to overlap
between user terminals within a cell. Note that radio resources are resources of
frequency or time for radio communication, which include various types such as a
resource block, a subframe, and a resource element. Such a radio access technology of
allocating radio resources so that they do not overlap is also called orthogonal multiple
access.
[0024] Here, FIG. 1 illustrates an example of allocation of radio resources in orthogonal
multiple access. In FIG. 1, the horizontal axis indicates frequency, and radio resources
allocated to different users are shown by different colors. As illustrated in FIG. 1,
resource blocks (RBs) different in the frequency direction, for example, can be
allocated to users in orthogonal multiple access.
[0025] In contrast, in non-orthogonal multiple access, at least partly overlapping radio
resources are allocated to user terminals within a cell. In the case where non-or
thogonal multiple access is adopted, signals transmitted and received by user terminals
within a cell can interfere with each other in a wireless space. The receiving side,
however, is able to acquire information for each user through predetermined decoding
processing. It is theoretically known that non-orthogonal multiple access achieves
higher communication capability (or cell communication capability) than orthogonal
multiple access when the allocation of radio resources is performed appropriately.
[0026] Here, FIG. 2 illustrates an example of allocation of radio resources in non-orthogonal
multiple access. In FIG. 2, the horizontal axis indicates frequency, and radio resources
allocated to different users are shown by different colors. As illustrated in FIG. 2,
resource blocks overlapping in the frequency direction, for example, can be allocated
to users in non-orthogonal multiple access.
[0027] IDMA is one of radio access technologies categorized as non-orthogonal multiple
access. In IDMA, to identify user signals, different interleave patterns, which are used
for interleave processing that a transmitting-side apparatus performs on transmission
signals, are allocated to different users. A receiving-side apparatus decodes user
signals separately by using de-interleave patterns corresponding to the interleave
patterns allocated to the respective users. An advantage of IDMA is a light load of
signal processing by the transmitting-side apparatus. This advantage is particularly em
phasized in uplink (UL) from a user terminal to a base station.
[0028] Here, FIG. 3 illustrates a basic example configuration of a transmitting station 10 that
performs radio communication using IDMA. As illustrated in FIG. 3, the transmitting
station 10 includes an error correction encoding circuit 11, an interleaver (p ) 12, a
digital modulation circuit 13, and a radio frequency (RF) circuit 14. The error
correction encoding circuit 11 performs error correction encoding on an information
bit string of a user i. The interleaver (p ) 12, which is an interleaver allocated for the
user i, performs interleave processing on the information bit string that has been
subjected to error correction encoding. The digital modulation circuit 13 digitally
modulates the information bit string that has gone through interleave processing. The
RF circuit 14 performs various kinds of signal processing on a signal after digital
modulation, and transmits a radio signal via an antenna. Note that interleaver allocation
is performed by allocating at least one of an interleaver type and an interleave pattern.
[0029] An interleaver type, which means a type of interleaver, is a policy of an interleave
pattern used by an interleaver. Correlation characteristics are maintained between in
terleave patterns of the same interleaver type. In contrast, correlation characteristics are
unknown between interleave patterns of different interleaver types. Therefore, it is
preferred to allocate different interleave patterns of the same interleaver type for users
between which interference can occur.
[0030] FIG. 4 illustrates a basic example configuration of a receiving station 20 that
performs radio communication using IDMA. As illustrated in FIG. 4, the receiving
station 20 includes an RF circuit 21, a signal separation circuit 22, and decoding
circuits 23. The RF circuit 2 1 performs various kinds of signal processing on a radio
signal received by an antenna, and outputs the resulting signal to the signal separation
circuit 22. The signal separation circuit 22 has a function of separating a composite
signal, in which signals of users are combined, into signals for the respective users, and
outputs each user signal obtained by the separation to the corresponding decoding
circuit 23. For example, the decoding circuit 23i includes a de-interleaver (p ') 24 for a
user i, an error correction decoding circuit 25, and an interleaver (p ) 26 for the user i.
The decoding circuit 23i, to which a user signal from the user i is input, performs deinterleave
processing by the de-interleaver (p ' ) 24 and decoding by the error
correction decoding circuit 25. The decoding circuit 23i outputs the decoded signal as
an information bit string of the user i when decoding has been performed correctly. In
addition, the decoding circuit 23i performs interleave processing by the interleaver (p )
26 on the decoded signal, and returns the resulting signal as a user signal for the user i
to the signal separation circuit 22. Such returning of a user signal is performed for all
the user signals. The signal separation circuit 22 performs signal separation again using
returned user signals, and outputs user signals after the separation to the decoding
circuits 23 again. The receiving station 20 repeats the signal processing by the signal
separation circuit 22 and the decoding circuits 23, thereby decoding user signals. Such
decoding of user signals from a multiple signal is also called multi user detection
below.
[003 1] <2. Configuration>
<2.1. Example Configuration of Communication System>
FIG. 5 illustrates an example of the entire configuration of a communication system
according to an embodiment of the present disclosure. As illustrated in FIG. 5, a com
munication system 1 according to the present embodiment includes a communication
control apparatus 100 and a terminal apparatus 200.
[0032] The communication control apparatus 100 is an apparatus that coordinately controls
communication within the communication system 1. The communication control
apparatus 100 may be implemented as a logical entity included as one of functions in
another apparatus or may be implemented as a physical entity such as a server. In the
example illustrated in FIG. 5, the communication control apparatus 100 is a logical
entity included in a base station. The base station 100 is a radio communication
apparatus that provides a radio communication service for one or more terminal ap
paratuses 200 located inside a cell 300, and transmits and receives data to/from the
terminal apparatuses 200. For example, the base station 100 is an evolutional Node B
(eNB) or an access point in a cellular system. The base station 100 is connected to a
core network 400. The core network 400 is connected to a packet data network (PDN)
via a gateway apparatus. The cell 300 may be operated in accordance with any radio
communication scheme, such as long term evolution (LTE), LTE-advanced (LTE-A),
GSM (registered trademark), UMTS, W-CDMA, CDMA2000, WiMAX, WiMAX2, or
IEEE802.16.
[0033] The terminal apparatus 200 is a radio communication apparatus that is provided with
the radio communication service by the base station 100, and transmits and receives
data to/from the base station 100. For example, the terminal apparatus 200 is a user
terminal (user equipment (UE)) in a cellular system.
[0034] IDMA is used in the communication system 1. In other words, the base station 100
and the terminal apparatus 200 perform radio communication using IDMA. At that
time, the base station 100 allocates interleavers to be used in uplink communication or
downlink communication with the terminal apparatuses 200A and 200B. The commu
nication control apparatus 100 allocates interleavers suitable for communication with
the terminal apparatuses 200A and 200B, thereby allowing multiplexing of user
signals.
[0035] The terminal apparatus 200C may have a function as the communication control
apparatus 100. In that case, the terminal apparatus 200C allocates interleavers to be
used in device to device (D2D) communication with the terminal apparatuses 200D
and 200E.
[0036] <2.2. Example Configuration of Communication Control Apparatus>
FIG. 6 is a block diagram illustrating an example of a logical configuration of the
communication control apparatus 100 according to the present embodiment. As i l
lustrated in FIG. 6, the communication control apparatus 100 includes a radio commu
nication unit 110, a network communication unit 120, a storage unit 130, and a control
unit 140. Described here is an example configuration when the communication control
apparatus 100 is implemented as a base station.
[0037] (1) Radio communication unit 110
The radio communication unit 110 executes radio communication with the terminal
apparatus 200 connected to the cell 300. For example, the radio communication unit
110 receives uplink traffic from the terminal apparatus 200, and transmits downlink
traffic to the terminal apparatus 200. In addition, the radio communication unit 110
broadcasts a synchronization signal and a reference signal in downlink. The synchro
nization signal is used for the terminal apparatus 200 to achieve synchronization with
the cell 300. The reference signal is used for measuring communication quality. The
communication quality measured using the reference signal serves as, for example, an
indicator for handover determination that triggers handover between cells. Specific
examples of the reference signal include a common reference signal (CRS) and a
channel state information reference signal (CSI-RS). The radio communication unit
110 also controls its transmission processing and reception processing by using al
location information described later, notification of which has been given from the
control unit 140. Furthermore, the radio communication unit 110 transmits this al
location information to the terminal apparatus 200. As illustrated in FIG. 6, the radio
communication unit 110 includes a physical layer controller 112 and an interleave unit
114.
[0038] (1-1) Physical layer controller 112
The physical layer controller 112 has a function of controlling processing related to a
physical layer in the radio communication unit 110, based on control by the control
unit 140. For example, the physical layer controller 112 controls, based on allocation
information, parameters for an error correcting code, modulation, an interleaver, and
the like related to transmission processing. The physical layer controller 112 also
controls, based on allocation information, parameters for signal separation, de
modulation, a de-interleaver, and the like related to reception processing.
[0039] (1-2) Interleave unit 114
The interleave unit 114 has a function of performing interleave processing or deinterleave
processing in the radio communication unit 110. For example, the interleave
unit 114 includes the interleaver 12, and configures the interleaver 12 using an in
terleaver type and an interleave pattern set by the physical layer controller 112. In
addition, the interleave unit 114 includes the signal separation circuit 22 and the
decoding circuits 23, and configures the de-interleavers 24 using a de-interleaver type
and a de-interleave pattern set by the physical layer controller 112.
[0040] (2) Network communication unit 120
The network communication unit 120 is a communication interface for connecting
the communication control apparatus 100 to the core network 400. The network com
munication unit 120 may be a wired communication interface or may be a radio com
munication interface. The network communication unit 120 transmits and receives data
traffic to/from various controls nodes within the core network 400, and exchanges
control messages.
[0041] (3) Storage unit 130
The storage unit 130 has a function of storing various kinds of information. For
example, the storage unit 130 can store allocation information, which is described
later.
[0042] (4) Control unit 140
The control unit 140 functions as an arithmetic processing apparatus and a control
apparatus, and controls the whole operation within the communication control
apparatus 100 in accordance with various programs. As illustrated in FIG. 6, the
control unit 140 includes an interval control unit 142, an allocation control unit 144,
and a communication control unit 146.
[0043] (4-1) Interval control unit 142
The interval control unit 142 has a function of dynamically changing the interval of
allocation of an interleaver used for IDMA by the terminal apparatus 200. Specifically,
the interval control unit 142 dynamically changes the interval at which the allocation
control unit 144 performs interleaver allocation.
[0044] For example, the interval control unit 142 may change an interleaver allocation
interval to a time equal to the minimum TTI. Allocating an interleaver at an interval
equal to the minimum TTI is also called a dynamic allocation policy below. The
dynamic allocation policy is similar to an allocation policy in resource scheduling in a
cellular system. The interval control unit 142 may change an interleaver allocation
interval to a time longer than the minimum TTI. Allocating an interleaver at an interval
longer than the minimum TTI is also called a static or quasi-static allocation policy
below. An interleaver allocation interval is a finite value in the case of a quasi-static al
location policy, and is infinite in the case of a static allocation policy. That is, the com
munication control apparatus 100 performs interleaver allocation alone in the case of a
quasi-static allocation policy, and does not perform interleaver allocation alone in the
case of a static allocation policy. As will be described later, the communication control
apparatus 100 may be caused to perform interleaver allocation by an external factor,
such as a request from the terminal apparatus 200, while adopting a static allocation
policy. Interleaver allocation policies, e.g., dynamic, static, and quasi-static, are
described below in further detail with reference to FIG. 7.
[0045] FIG. 7 is an explanatory diagram for describing interleaver allocation policies
according to the present embodiment. The reference sign "510" indicates changes in
the allocated interleaver in the case of a dynamic allocation policy. As indicated by
"510", the allocated interleaver is changed every minimum TTI in the dynamic al
location policy. Here, indicates an interleaver of an index i. The reference sign "520"
indicates changes in the allocated interleaver in the case of a quasi-static allocation
policy. As indicated by "520", the allocated interleaver is changed at an interval longer
than the minimum TTI in the quasi-static allocation policy. The reference sign "530"
indicates changes in the allocated interleaver in the case of a static allocation policy.
As indicated by "530", the allocated interleaver is not changed in the static allocation
policy.
[0046] The interval control unit 142 may change an interleaver allocation interval by d y
namically switching interleaver allocation policies, e.g., dynamic, static, and quasistatic,
or may dynamically change the allocation interval while keeping the allocation
policy. Here, in a dynamic allocation policy, transmission and reception of control
messages related to interleaver allocation occur every minimum TTI between the com
munication control apparatus 100 and the terminal apparatus 200. Regarding this point,
in a static or quasi-static allocation policy, transmission and reception of control
messages can be reduced, resulting in reduced overhead, because interleaver allocation
is performed at an interval longer than the minimum TTI. Accordingly, the interval
control unit 142 can reduce overhead by switching the interleaver allocation policy
from a dynamic allocation policy to a static or quasi-static allocation policy. Note that
the interval control unit 142 may set a different allocation policy or allocation interval
or the same allocation policy or allocation interval for each of the terminal apparatuses
200.
[0047] The interval control unit 142 may change the interval based on information related to
communication by the base station 100 and the terminal apparatus 200. The in
formation related to communication by the base station 100 and the terminal apparatus
200 is also called communication environment information below. For example, the
interval control unit 142 can acquire the communication environment information from
another base station 100 or terminal apparatus 200 or another control apparatus or the
like. As is described below, various kinds of communication environment information
are conceivable.
[0048] For example, the communication environment information may include identification
information that is temporarily given to the terminal apparatus 200 for control. For
example, in a cellular system, an example of such identification information is a radio
network temporal identifier (RNTI).
[0049] For example, the communication environment information may include identification
information unique to the terminal apparatus 200. For example, such identification in
formation may be physical identification information linked to the terminal apparatus
200, or may be a Subscriber ID or the like registered by a network operator in a
cellular system.
[0050] For example, the communication environment information may include capability in
formation of the terminal apparatus 200. For example, the capability information
includes information indicating a radio access technology (RAT) with which the
terminal apparatus 200 is compatible. In the present embodiment, the capability in
formation can include information indicating whether or not the terminal apparatus 200
is compatible with IDMA and whether or not, if compatible with IDMA, the terminal
apparatus 200 is compatible with a static or quasi-static interleaver allocation policy
according to the present embodiment.
[0051] For example, the communication environment information may include information
indicating a state of packet traffic of the terminal apparatus 200. For example, the in
formation indicating a state of packet traffic can include information indicating
whether the terminal apparatus 200 is in an idle state or performing transmission and
reception.
[0052] For example, the communication environment information may include information
on a state of interleaver allocation. For example, the information on a state of in
terleaver allocation can include information indicating an interleaver allocation policy
(i.e., information indicating whether the allocation policy is dynamic, quasi-static, or
static) and time elapsed from the previous interleaver allocation.
[0053] For example, the communication environment information may include information
indicating a statistic related to a packet transmitted or received by the terminal
apparatus 200. Examples of the information indicating a statistic related to a packet
include the average size, communication elapsed time, and the peak size of a packet
during communication.
[0054] For example, the communication environment information may include information
indicating the category of an application used by the terminal apparatus 200. Examples
of categories of applications are applications that perform data communication, ap
plications that make phone calls, and applications that only keep connection. In the
case of applications that perform data communication, the category of the applications
may be subdivided into more specific categories such as streaming, live streaming,
text, images, moving images, and games (cloud/real time). Similarly, in the case of ap
plications that make phone calls, the category of the applications may be subdivided
into more specific categories such as voice calls and video calls.
[0055] For example, the communication environment information may include information
indicating a trigger of switching between application types. Examples of the trigger of
switching between application types are reception of a paging message addressed to
the terminal apparatus 200 and a response message by the terminal apparatus 200.
[0056] For example, the communication environment information may include a quality of
service class identifier (QCI). A QCI is a label related to QoS that a bearer has. As is
described in "LTE-The UMTS Long Term Evolution from Theory to Practice (Second
edition)" by Stefania Sesia, Issam Toufik, and Matthew Baker, Wiley, 2011, QCIs in
LTE are defined as in Table 1 below.
[0057]
[Table 1]
[0058] For example, the above-described overhead caused by frequent interaction on a
control channel can be a problem in operating services where the packet size is small, a
fluctuation of packet size is static or quasi-static, or communication occurs peri
odically, such as Voice over IP (VoIP) and Voice over LTE (VoLTE). Thus, when
operation of such a service is assumed based on communication environment in
formation, the interval control unit 142 changes the allocation policy to a static or
quasi-static allocation policy, thereby reducing overhead effectively. In addition, the
interval control unit 142 can reduce overhead effectively by changing the allocation
policy to a static or quasi-static allocation policy under various situations. Specific
scenarios will be described in detail later.
[0059] (4-2) Allocation control unit 144
The allocation control unit 144 has a function of allocating an interleaver at an
interval set by the interval control unit 142. For example, the allocation control unit
144 allocates at least one of an interleaver type and an interleave pattern to each of the
terminal apparatuses 200 at an interval set by the interval control unit 142.
[0060] The allocation control unit 144 may allocate an interleaver based on information
related to communication by the base station 100 and the terminal apparatus 200. In
other words, the allocation control unit 144 may allocate an interleaver based on communication
environment information, like the interval control unit 142. For example,
the allocation control unit 144 can allocate an interleaver based on a QCI. Alter
natively, the allocation control unit 144 may allocate an interleaver in accordance with
an allocation rule corresponding to the communication environment information. For
example, the allocation control unit 144 can adopt an interleaver type corresponding to
a QCI and allocate an interleave pattern of the interleaver type. Specific scenarios will
be described in detail later.
[0061] (4-3) Communication control unit 146
The communication control unit 146 has a function of controlling communication of
the radio communication unit 110 with the terminal apparatus 200. For example, the
communication control unit 146 notifies the radio communication unit 110 of in
formation indicating an interleaver allocation policy in the interval control unit 142, in
formation indicating an allocation interval set by the interval control unit 142, and in
formation indicating an interleaver allocated by the allocation control unit 144. Such
information is also collectively called allocation information below. The commu
nication control unit 146 may control the radio communication unit 110 to cause the
radio communication unit 110 to notify the terminal apparatus 200 of the allocation in
formation using a control signal or a control channel.
[0062] The communication control unit 146 also has a function of controlling the radio com
munication unit 110 to cause the radio communication unit 110 to perform interleave
processing using an interleaver allocated by the allocation control unit 144 at an
interval dynamically changed by the interval control unit 142. Specifically, the com
munication control unit 146 controls the physical layer controller 112 to cause the
physical layer controller 112 to set the interleaver 12, the de-interleavers 24, and the
interleavers 26 in accordance with the allocation information. This control allows the
communication control apparatus 100 to perform radio communication using IDMA
with the terminal apparatus 200.
[0063] The example configuration of the communication control apparatus 100 according to
the present embodiment has been described. Next, an example configuration of the
terminal apparatus 200 according to the present embodiment is described with
reference to FIGS. 8 and 9.
[0064] <2.3. Example Configuration of Terminal Apparatus>
FIG. 8 is a block diagram illustrating an example of a logical configuration of the
terminal apparatus 200 according to the present embodiment. As illustrated in FIG. 8,
the terminal apparatus 200 includes a radio communication unit 210, a storage unit
220, and a control unit 230.
[0065] (1) Radio communication unit 210
The radio communication unit 210 executes radio communication with the base
station 100. For example, the radio communication unit 210 receives downlink traffic
from the base station 100, and transmits uplink traffic to the base station 100. In
addition, the radio communication unit 210 receives a synchronization signal and a
reference signal that have been broadcasted in downlink from the base station 100. The
radio communication unit 210 achieves synchronization with the cell 300 using the
received synchronization signal. The radio communication unit 210 measures commu
nication quality using the reference signal. The radio communication unit 210 also
receives allocation information from the communication control apparatus 100. The
radio communication unit 210 controls its transmission processing and reception
processing by using the received allocation information. As illustrated in FIG. 8, the
radio communication unit 210 includes a physical layer controller 212 and an in
terleave unit 214.
[0066] (1-1) Physical layer controller 212
The physical layer controller 212 has a function of controlling processing related to a
physical layer in the radio communication unit 210, based on control by the control
unit 230. For example, the physical layer controller 212 controls, based on allocation
information, parameters for an error correcting code, modulation, an interleaver, and
the like related to transmission processing. The physical layer controller 212 also
controls, based on allocation information, parameters for signal separation, de
modulation, a de-interleaver, and the like related to reception processing.
[0067] (1-2) Interleave unit 214
The interleave unit 214 has a function of performing interleave processing or deinterleave
processing in the radio communication unit 210. For example, the interleave
unit 214 includes the interleaver 12, and configures the interleaver 12 using an in
terleaver type and an interleave pattern set by the physical layer controller 212. In
addition, the interleave unit 214 includes the signal separation circuit 22 and the
decoding circuits 23, and configures the de-interleavers 24 using a de-interleaver type
and a de-interleave pattern set by the physical layer controller 212.
[0068] Here, the relation between the physical controller 212 and the interleave unit 214 is
described in further detail with reference to FIG. 9. FIG. 9 is a block diagram il
lustrating an example of a logical configuration of the radio communication unit 210 of
the terminal apparatus 200 according to the present embodiment. As illustrated in FIG.
9, the radio communication unit 210 according to the present embodiment includes the
error correction encoding circuit 11, the interleaver 12, the digital modulation circuit
13, and the RF circuit 14 for transmission. The radio communication unit 210 also
includes the RF circuit 2 1 for reception, the signal separation circuit 22, the deinterleavers
24, the error correction decoding circuits 25, and the interleavers 26. These
elements included in the radio communication unit 210 have been described above
with reference to FIGS. 3 and 4 and description thereof is omitted here.
[0069] As illustrated in FIG. 9, the radio communication unit 210 includes the physical layer
controller 212. The physical layer controller 212 acquires information stored in a
control signal or a control channel, which has been separated by the signal separation
circuit 22. For example, the physical layer controller 212 acquires allocation in
formation transmitted by the base station 100 on a control channel. The physical layer
controller 212 sets the interleaver 12, the de-interleavers 24, and the interleavers 26 in
accordance with the acquired allocation information. The acquisition of the allocation
information and the setting of the interleaver 12, the de-interleavers 24, and the in
terleavers 26 may be performed by the physical layer controller 212 alone, or may be
performed in accordance with control by the control unit 230.
[0070] (2) Storage unit 220
The storage unit 220 has a function of storing various kinds of information. For
example, the storage unit 220 stores allocation information received from the base
station 100 by the radio communication unit 210.
[0071] (3) Control unit 230
The control unit 230 functions as an arithmetic processing apparatus and a control
apparatus, and controls the whole operation within the terminal apparatus 200 in ac
cordance with various programs. For example, the control unit 230 has a function of
controlling the radio communication unit 210 to cause the radio communication unit
210 to perform interleave processing using an interleaver allocated at an interval d y
namically changed by the communication control apparatus 100. Specifically, the
control unit 230 controls the physical layer controller 212 to cause the physical layer
controller 212 to set the interleaver 12, the de-interleavers 24, and the interleavers 26
in accordance with the allocation information received from the base station 100 by the
radio communication unit 210. This control allows the terminal apparatus 200 to
perform radio communication using IDMA with the base station 100.
[0072] The control unit 230 may continuously monitor the control channel to acquire al
location information. Alternatively, the control unit 230 may monitor the control
channel at the timing of notification of allocation information, in accordance with an
allocation policy and an allocation interval indicated by the allocation information. In
that case, processing load, power consumption, and the like in the terminal apparatus
200 can be reduced.
[0073] Furthermore, the control unit 230 may control the radio communication unit 210 to
cause the radio communication unit 210 to transmit a message requesting a change of
an interleaver allocation interval or interleaver allocation, in accordance with the
situation of communication by the radio communication unit 210. For example, the
control unit 230 can control the radio communication unit 210 to cause the radio communication
unit 210 to transmit a message requesting a change of an allocation policy,
an allocation interval, or interleaver allocation to the communication control apparatus
100, in accordance with the situation of interference.
[0074] The example configuration of the terminal apparatus 200 according to the present
embodiment has been described.
[0075] <3. Function Details >
Hereinafter, a function of deciding an interleaver allocation policy by the interval
control unit 142 and a function of allocating an interleaver by the allocation control
unit 144 will be described in detail. Specific scenarios are given in the description.
[0076] (1) First scenario
In cellular systems, an original service, contract, or the like of a network operator
sometimes imposes some kind of limitation on a communication service enjoyed by a
specific terminal apparatus 200. Examples of such a service or contract include a
contract for only voice calls, a contract for a machine to machine (M2M) module, a
pay-per-use contract of packet communication, and a communication speed limit. A
contract for only voice calls can permit periodic communication with small data sizes.
A contract for an M2M module can permit communication with small packet sizes.
Under a pay-per-use contract of packet communication, transmission and reception of
large-sized packets are less likely to occur because a user tries to reduce fees as much
as possible. Examples of a communication speed limit include cases where
transmission and reception of small- sized packets are forced, such as a contract to
provide a low-speed communication service and a speed limit due to a data traffic
upper limit. For example, the interval control unit 142 finds a service or contract for
the terminal apparatus 200 by using identification information linked to the terminal
apparatus 200, such as an RNTI or a Subscriber ID. Then, the interval control unit 142
sets the allocation policy for the terminal apparatus 200 under the above-described
limitation to a static or quasi-static allocation policy. Thus, overhead for interleaver al
location can be reduced.
[0077] (2) Second scenario
For example, the interval control unit 142 may change an interleaver allocation
interval based on information indicating the category of an application used by the
terminal apparatus 200. For example, when the terminal apparatus 200 uses an ap
plication where the packet size is small, a fluctuation of packet size is static or quasistatic,
or communication can occur periodically, the interval control unit 142 adopts a
static or quasi-static allocation policy as the allocation policy. When the terminal
apparatus 200 uses an application other than such an application, the interval control
unit 142 adopts a dynamic allocation policy as the allocation policy. The interval
control unit 142 can determine whether or not such an application is used based on
communication environment information. A determination criterion may be set ar
bitrarily by an operator of the communication system 1. A conceivable example of
such an application is a voice call.
[0078] (3) Third scenario
For example, the interval control unit 142 may change an interleaver allocation
interval based on a QCI. For example, the interval control unit 142 can decide an in
terleaver allocation policy in accordance with Table 2 below.
[0079] [Table 2]
[0080] The term "any" in the table indicates that any policy can be adopted. Note that Table
2 is an example of association between QCIs and interleaver allocation policies, and
the interval control unit 142 may decide an allocation policy in accordance with
different association.
[008 1] (4) Fourth scenario
This scenario is a scenario in which an interleaver corresponding to a QCI is
allocated in addition to the third scenario. Specifically, the allocation control unit 144
may allocate an interleaver based on a QCI. For example, the allocation control unit
144 allocates any interleave pattern from a candidate set P of interleave patterns that
can be allocated, which is expressed by Formula 1 below.
[0082] [Math.l]
...(Formula 1)
[0083] Here, N nterie er_i is the total number of interleave patterns included in the candidate set
P. For example, the allocation control unit 144 may allocate an interleaver from
among candidates corresponding to a QCI in accordance with Table 3 below.
[0084]
[Table 3]
[0085] Here, interleaver candidates when a static or quasi-static allocation policy is adopted
preferably have low correlation to each other. This is because in a static or quasi-static
allocation policy, once an interleaver is allocated, the interleaver is not changed for a
time longer than that in a dynamic allocation policy, and thus the state of interference
is kept for the long time.
[0086] There are various conceivable allocation timings in a quasi-static allocation policy.
For example, when a quasi-static allocation policy is adopted, the allocation control
unit 144 can allocate an interleaver based on time elapsed from the previous interleaver
allocation. Specifically, the allocation control unit 144 may determine whether to
execute interleaver allocation in accordance with criterion formulas in Table 4 below.
[0087] [Table 4]
Here, Telapse is communication elapsed time (ms) from the previous allocation. Tth elapse
is a threshold value (ms) related to the communication elapsed time from the previous
allocation. The threshold value Tth elapse related to the communication elapsed time can
be regarded as an interleaver allocation cycle. For example, the interval control unit
142 can set the interleaver allocation cycle to the cycle of channel feedback from the
terminal apparatus 200 or an integer multiple of the cycle. Alternatively, the interval
control unit 142 can set the interleaver allocation cycle to the cycle of transmission of a
reference signal for acquisition of channel information by the terminal apparatus 200
or an integer multiple of the cycle of transmission.
[0089] (5) Fifth scenario
This scenario is a scenario in which an interleaver allocation rule corresponding to a
QCI is adopted in addition to the third scenario. Specifically, the allocation control unit
144 may allocate an interleaver in accordance with an allocation rule corresponding to
a QCI. For example, the allocation control unit 144 can allocate an interleave pattern of
an interleaver type corresponding to a QCI, as an allocation rule corresponding to the
QCI. For example, the allocation control unit 144 allocates any interleave pattern k
from a candidate set nkof interleave patterns that can be allocated, which is expressed
by Formula 2 below.
[0090]
[0091] Here, NPattern is the total number of the candidate set nk,and k, which is the total
number of allocation rules, indicates, for example, the total number of interleaver
types. For example, the allocation control unit 144 may allocate an interleaver from
among interleaver type candidates in an allocation rule corresponding to a QCI, in ac
cordance with Table 5 below.
[0092]
[Table 5]
[0093] (6) Sixth scenario
For example, the interval control unit 142 may change an interleaver allocation
interval based on information indicating a statistic related to a packet transmitted or
received by the terminal apparatus 200. For example, the interval control unit 142 can
decide an interleaver allocation policy in accordance with criterion formulas A in
Table 6 below, and the allocation control unit 144 can allocate an interleaver in ac
cordance with criterion formulas B in Table 6 below.
[0094] [Table 6]
Here, N packet is the average size (bit) of transmission or reception packets. Nthpacket is
a threshold value (bit) related to the average size of transmission or reception packets.
The term "none" in the table means that determination using a criterion formula is
skipped. Note that Table 6 is an example of association between information indicating
a statistic related to a packet transmitted or received by the terminal apparatus 200 and
interleaver allocation policies, and the interval control unit 142 may decide an al
location policy in accordance with different association.
[0096] (7) Seventh scenario
For example, the interval control unit 142 may change an interleaver allocation
interval based on information indicating a state of packet traffic of the terminal
apparatus 200. For example, the interval control unit 142 may adopt a static or quasistatic
allocation policy when the terminal apparatus 200 is in an idle state and only
keeps connection with a serving cell, and adopt a dynamic allocation policy in other
cases.
[0097] <4. Operation Processing>
Next, an example of operation processing in the communication system 1 according
to the present embodiment is described with reference to FIGS. 10 and 11. Here, the
base station 100 has a function as the communication control apparatus 100.
[0098] FIG. 10 is a sequence diagram illustrating an example of the flow of notification
processing of allocation information executed in the communication system 1
according to the present embodiment. As illustrated in FIG. 10, the base station 100
and the terminal apparatus 200 are related to this sequence.
[0099] As illustrated in FIG. 10, first, the base station 100 performs allocation processing in
step S102. For example, the interval control unit 142 may switch an interleaver a l
location policy or change an interleaver allocation interval. In addition, the allocation
control unit 144 may allocate an interleaver to the terminal apparatus 200. Only either
one of these may be performed.
[0100] Then, in step S104, the base station 100 transmits allocation information indicating
an allocation result in step S102 to the terminal apparatus 200. For example, the radio
communication unit 110 transmits the allocation information to the terminal apparatus
200 on a control channel.
[0101] Next, in step S106, the base station 100 and the terminal apparatus 200 perform com
munication in accordance with the transmitted or received allocation information.
[0102] In step S108, the terminal apparatus 200 transmits a change request to the base
station 100. The change request is a message requesting a change of at least one of an
allocation policy, an allocation interval, and the allocated interleaver. The terminal
apparatus 200 can transmit the change request when, for example, interference from
surroundings exceeds a threshold value.
[0103] Then, in step SI 10, the base station 100 performs change processing corresponding
to the change request. For example, the interval control unit 142 may switch the in
terleaver allocation policy or, in the case of a quasi-static allocation policy, may
change the allocation interval while keeping the policy. In addition, the allocation
control unit 144 may change the interleaver allocated to the terminal apparatus 200.
Needless to say, the base station 100 may reject the change request and not perform
change processing.
[0104] Next, in step SI 12, the base station 100 transmits a change response indicating a
response to the change request to the terminal apparatus 200. In the case where change
processing has been performed in the base station 100, the change response includes
allocation information indicating a change result in step SI 10. In the case where the
change request has been rejected in the base station 100, the change response includes
information indicating the rejection of the change request.
[0105] An example of notification processing of allocation information has been described.
Next, setting processing of an interleaver allocation interval is described with reference
to FIG. 11.
[0106] FIG. 11 is a flowchart illustrating an example of the flow of setting processing of an
interleaver allocation interval executed in the communication control apparatus 100
according to the present embodiment.
[0107] As illustrated in FIG. 11, first, the control unit 140 acquires communication en
vironment information in step S202. For example, the interval control unit 142
acquires communication environment information from the base station 100, the
terminal apparatus 200, or another control apparatus or the like via the radio commu
nication unit 110 or the network communication unit 120.
[0108] Then, in step S204, the control unit 140 determines whether or not the target terminal
apparatus 200 is compatible with a static or quasi-static interleaver allocation policy.
For example, the control unit 140 can perform this determination by referring to c a
pability information of the terminal apparatus 200.
[0109] When the target terminal apparatus 200 is determined to be compatible (S204/YES),
the control unit 140 determines whether or not the adoption of a static or quasi-static
allocation policy is necessary in step S206. For example, the control unit 140 de
termines whether or not the adoption of a static or quasi- static allocation policy is
necessary by using a determination criterion related to the scenario described above
with an example.
[0110] When the adoption of a static or quasi- static allocation policy is determined to be
necessary (S206/YES), the control unit 140 adopts a static or quasi-static allocation
policy in step S208. In step S210, the control unit 140 sets an allocation interval. For
example, when a static allocation policy is adopted, the control unit 140 sets the al
location interval infinite. When a quasi-static allocation policy is adopted, the control
unit 140 sets the allocation interval to a time longer than the minimum TTI.
[0111] When the target terminal apparatus 200 is determined not to be compatible with a
static or quasi-static interleaver allocation policy (S204/NO) or the adoption of a static
or quasi-static allocation policy is determined not to be necessary (S206/NO), the
processing proceeds to step S212. In step S212, the control unit 140 adopts a dynamic
allocation policy. In step S214, the control unit 140 sets an allocation interval. For
example, the control unit 140 sets the allocation interval to a time equal to the
minimum TTI.
[01 12] An example of setting processing of an interleaver allocation interval has been
described. Note that the order of the above steps S204 and S206 may be reversed.
[01 13] <5. Modification examples>
The above-described technology related to interleaver allocation can be combined
with other multiple access technologies.
[0114] (Case of OFDMA)
Hereinafter, a case of combining the above-described technology related to in
terleaver allocation with OFDMA will be described as an example. Although de
scription is given assuming that the minimum unit of resources allocated to the
terminal apparatuses 200 in OFDMA is a resource block (RB) including a plurality of
subcarriers, the minimum unit may be any other unit, such as a subcarrier unit.
[01 15] FIG. 12 is an explanatory diagram for describing resource allocation in OFDMA. In
the example illustrated in FIG. 12, RBO and RBI are allocated to the terminal
apparatus 200A, and RB2 and RB3 are allocated to the terminal apparatus 200B. In
this way, different RBs are allocated to different terminal apparatuses 200 in OFDMA.
[01 16] FIGS. 13 and 14 are explanatory diagrams for describing resource allocation when
OFDMA and IDMA are combined. In the example illustrated in FIG. 13, an interleaver
A is allocated to the terminal apparatus 200A, and an interleaver B is allocated to the
terminal apparatus 200B. In addition, RBO, RBI, RB2, and RB3 are allocated to the
terminal apparatuses 200A and 200B. In the example illustrated in FIG. 14, an in
terleaver A is allocated to the terminal apparatus 200A, and an interleaver B is
allocated to the terminal apparatus 200B. In addition, RBI, RB2, and RB3 are
allocated to the terminal apparatus 200A, and RBO, RBI, and RB2 are allocated to the
terminal apparatus 200B. In this way, the plurality of terminal apparatuses 200 have
different interleavers allocated, thereby sharing RBs.
[01 17] The control unit 140 may switch an interleaver allocation policy, dynamically change
an interleaver allocation interval, or allocate an interleaver as described above also in
the case where OFDMA and IDMA are combined. At that time, the interval control
unit 142 preferably sets an interleaver allocation interval to a time corresponding to a
resource allocation interval for another access scheme. For example, in OFDMA, the
interval control unit 142 sets an interleaver allocation interval to the same interval as
an RB allocation interval or an integer multiple thereof. In this case, the base station
100 can perform signaling related to interleaver allocation and RB allocation at the
same timing, and overhead is reduced. In addition, the base station 100 may perform
signaling when one of a change of the allocated interleaver and a change of an RB is
performed. Overhead is reduced also in this case. The scheduling of RBs by the base
station 100 is performed by using a measurement result in the terminal apparatus 200,
such as CSI measurement feedback. Accordingly, the interval control unit 142 may set
an interleaver allocation interval to the same interval as the interval of CSI mea
surement feedback or an integer multiple thereof. Furthermore, the interval control unit
142 may set the intervals of interleaver allocation to the plurality of terminal ap
paratuses 200 to the same interval. In this case, correlation between channels or cor
relation between allocated interleavers of the terminal apparatuses 200 is prevented
from fluctuating dynamically.
[0118] (Cases excluding OFDMA)
The above-described technology related to interleaver allocation can be combined
with a multiple access technology other than OFDMA. As in the case of OFDMA, the
interval control unit 142 may set an interleaver allocation interval to a time corre
sponding to a resource allocation interval for another access scheme. Table 7 below
shows multiple access technologies that can be combined with the above-described
technology related to interleaver allocation and examples of allocated resources.
[0119] [Table 7]
[0120] Needless to say, the multiple access technologies and resources listed in the above
table are examples, and the above-described technology related to interleaver al
location can be combined with any other multiple access technology.
[0121] <6. Application Examples>
The technology of an embodiment of the present disclosure is applicable to various
products. For example, the communication control apparatus 100 may be realized as
any type of server such as a tower server, a rack server, and a blade server. At least a
part of elements of the communication control apparatus 100 may be realized in a
control module (such as an integrated circuit module including a single die, and a card
or a blade that is inserted into a slot of a blade server) mounted on a server.
[0122] For example, the communication control apparatus 100 may be realized as any type
of evolved Node B (eNB) such as a macro eNB, and a small eNB. A small eNB may
be an eNB that covers a cell smaller than a macro cell, such as a pico eNB, micro eNB,
or home (femto) eNB. Instead, the communication control apparatus 100 may be
realized as any other types of base stations such as a NodeB and a base transceiver
station (BTS). The communication control apparatus 100 may include a main body
(that is also referred to as a base station apparatus) configured to control radio commu
nication, and one or more remote radio heads (RRH) disposed in a different place from
the main body. Additionally, various types of terminals to be discussed later may also
operate as the communication control apparatus 100 by temporarily or semi
permanently executing a base station function. Furthermore, at least a part of elements
of the communication control apparatus 100 may be realized in the base station
apparatus or a module for the base station apparatus.
[0123] For example, the terminal apparatus 200 may be realized as a mobile terminal such as
a smartphone, a tablet personal computer (PC), a notebook PC, a portable game
terminal, a portable/dongle type mobile router, and a digital camera, or an in-vehicle
terminal such as a car navigation apparatus. The terminal apparatus 200 may also be
realized as a terminal (that is also referred to as a machine type communication (MTC)
terminal) that performs machine-to-machine (M2M) communication. Furthermore, at
least a part of elements of the terminal apparatus 200 may be realized in a module
(such as an integrated circuit module including a single die) mounted on each of the
terminals.
[0124] <6-l. Application Example Regarding Control Entity>
FIG. 15 is a block diagram illustrating an example of a schematic configuration of a
server 700 to which the technology of an embodiment of the present disclosure may be
applied. The server 700 includes a processor 701, a memory 702, a storage 703, a
network interface 704, and a bus 706.
[0125] The processor 701 may be, for example, a central processing unit (CPU) or a digital
signal processor (DSP), and controls functions of the server 700. The memory 702
includes random access memory (RAM) and read only memory (ROM), and stores a
program that is executed by the processor 701 and data. The storage 703 may include a
storage medium such as a semiconductor memory and a hard disk.
[0126] The network interface 704 is a wired communication interface for connecting the
server 700 to a wired communication network 705. The wired communication network
705 may be a core network such as an Evolved Packet Core (EPC), or a packet data
network (PDN) such as the Internet.
[0127] The bus 706 connects the processor 701, the memory 702, the storage 703, and the
network interface 704 to each other. The bus 706 may include two or more buses (such
as a high speed bus and a low speed bus) each of which has different speed.
[0128] In the server 700 illustrated in FIG. 15, the interval control unit 142, the allocation
control unit 144, and the communication control unit 146 described by using FIG. 6
may be implemented by the processor 701. As an example, a program for causing a
processor to function as the interval control unit 142, the allocation control unit 144,
and the communication control unit 146 (in other words, a program for causing a
processor to execute the operations of the interval control unit 142, the allocation
control unit 144, and the communication control unit 146) may be installed in the
server 700 and the processor 701 may execute the program. As another example, a
module including the processor 701 and the memory 702 may be mounted on the
server 700 and the interval control unit 142, the allocation control unit 144, and the
communication control unit 146 may be implemented by the module. In this case, the
above module may store a program for causing a processor to function as the interval
control unit 142, the allocation control unit 144, and the communication control unit
146 in the memory 702 and execute the program by the processor 701. As described
above, the server 700 or the above module may be provided as an apparatus including
the interval control unit 142, the allocation control unit 144, and the communication
control unit 146, or the above program for causing a processor to function as the
interval control unit 142, the allocation control unit 144, and the communication
control unit 146 may be provided. Alternatively, a readable recording medium having
the above program recorded thereon may be provided.
[0129] <6.2. Application Examples Regarding Base Station>
(First Application Example)
FIG. 16 is a block diagram illustrating a first example of a schematic configuration of
an eNB to which the technology of an embodiment of the present disclosure may be
applied. An eNB 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.
[0130] Each of the antennas 810 includes a single or multiple antenna elements (such as
multiple antenna elements included in an MIMO antenna), and is used for the base
station apparatus 820 to transmit and receive radio signals. The eNB 800 may include
the multiple antennas 810, as illustrated in FIG. 16. For example, the multiple antennas
810 may be compatible with multiple frequency bands used by the eNB 800. Although
FIG. 16 illustrates the example in which the eNB 800 includes the multiple antennas
810, the eNB 800 may also include a single antenna 810.
[0131] The base station apparatus 820 includes a controller 821, a memory 822, a network
interface 823, and a radio communication interface 825.
[0132] The controller 821 may be, for example, a CPU or a DSP, and operates various
functions of a higher layer of the base station apparatus 820. For example, the
controller 821 generates a data packet from data in signals processed by the radio com
munication interface 825, and transfers the generated packet via the network interface
823. The controller 821 may bundle data from multiple base band processors to
generate the bundled packet, and transfer the generated bundled packet. The controller
821 may have logical functions of performing control such as radio resource control,
radio bearer control, mobility management, admission control, and scheduling. The
control may be performed in corporation with an eNB or a core network node in the
vicinity. The memory 822 includes RAM and ROM, and stores a program that is
executed by the controller 821, and various types of control data (such as a terminal
list, transmission power data, and scheduling data).
[0133] The network interface 823 is a communication interface for connecting the base
station apparatus 820 to a core network 824. The controller 821 may communicate
with a core network node or another eNB via the network interface 823. In that case,
the eNB 800, and the core network node or the other eNB may be connected to each
other through a logical interface (such as an SI interface and an X2 interface). The
network interface 823 may also be a wired communication interface or a radio commu
nication interface for radio backhaul. If the network interface 823 is a radio commu
nication interface, the network interface 823 may use a higher frequency band for radio
communication than a frequency band used by the radio communication interface 825.
[0134] The radio communication interface 825 supports any cellular communication scheme
such as Long Term Evolution (LTE) and LTE-Advanced, and provides radio
connection to a terminal positioned in a cell of the eNB 800 via the antenna 810. The
radio communication interface 825 may typically include, for example, a baseband
(BB) processor 826 and an RF circuit 827. The BB processor 826 may perform, for
example, encoding/decoding, modulating/demodulating, and multiplexing/demul
tiplexing, and performs various types of signal processing of layers (such as LI,
medium access control (MAC), radio link control (RLC), and a packet data con
vergence protocol (PDCP)). The BB processor 826 may have a part or all of the abovedescribed
logical functions instead of the controller 821. The BB processor 826 may be
a memory that stores a communication control program, or a module that includes a
processor and a related circuit configured to execute the program. Updating the
program may allow the functions of the BB processor 826 to be changed. The module
may be a card or a blade that is inserted into a slot of the base station apparatus 820.
Alternatively, the module may also be a chip that is mounted on the card or the blade.
Meanwhile, the RF circuit 827 may include, for example, a mixer, a filter, and an
amplifier, and transmits and receives radio signals via the antenna 810.
[0135] The radio communication interface 825 may include the multiple BB processors 826,
as illustrated in FIG. 16. For example, the multiple BB processors 826 may be
compatible with multiple frequency bands used by the eNB 800. The radio commu
nication interface 825 may include the multiple RF circuits 827, as illustrated in FIG.
16. For example, the multiple RF circuits 827 may be compatible with multiple
antenna elements. Although FIG. 16 illustrates the example in which the radio commu
nication interface 825 includes the multiple BB processors 826 and the multiple RF
circuits 827, the radio communication interface 825 may also include a single BB
processor 826 or a single RF circuit 827.
[0136] In the eNB 800 illustrated in FIG. 16, the interval control unit 142, the allocation
control unit 144, and the communication control unit 146 described by using FIG. 6
may be implemented by the radio communication interface 825. Alternatively, at least
a part of the elements may be implemented by the controller 821. As an example, a
module including a part (e.g., the BB processor 826) or the whole of the radio commu
nication interface 825 and/or the controller 821 may be mounted on the eNB 800 and
the interval control unit 142, the allocation control unit 144, and the communication
control unit 146 may be implemented by the module. In this case, the above module
may store a program for causing a processor to function as the interval control unit
142, the allocation control unit 144, and the communication control unit 146 (in other
words, a program for causing a processor to execute the operations of the interval
control unit 142, the allocation control unit 144, and the communication control unit
146) and execute the program. As another example, a program for causing a processor
to function as the interval control unit 142, the allocation control unit 144, and the
communication control unit 146 may be installed in the eNB 800 and the radio com
munication interface 825 (e.g., 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 above module may be provided as an apparatus including the interval control
unit 142, the allocation control unit 144, and the communication control unit 146, or
the program for causing a processor to function as the interval control unit 142, the al
location control unit 144, and the communication control unit 146 may be provided.
Alternatively, a readable recording medium having the above program recorded
thereon may be provided.
[0137] Furthermore, in the eNB 800 illustrated in FIG. 16, the radio communication unit 110
described by using FIG. 6 may be implemented by the radio communication interface
825 (e.g., the RF circuit 827). The network communication unit 120 may be im
plemented by the controller 821 and/or the network interface 823.
[0138] (Second Application Example)
FIG. 17 is a block diagram illustrating a second example of a schematic configuration
of an eNB to which the technology of an embodiment of 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 antenna 840 and the RRH 860 may be
connected to each other via an RF cable. The base station apparatus 850 and the RRH
860 may be connected to each other via a high speed line such as an optical fiber cable.
[0139] Each of the antennas 840 includes a single or multiple antenna elements (such as
multiple antenna elements included in an MIMO antenna), and is used for the RRH
860 to transmit and receive radio signals. The eNB 830 may include the multiple
antennas 840, as illustrated in FIG. 17. For example, the multiple antennas 840 may be
compatible with multiple frequency bands used by the eNB 830. Although FIG. 17 i l
lustrates the example in which the eNB 830 includes the multiple antennas 840, the
eNB 830 may also include a single antenna 840.
[0140] The base station apparatus 850 includes a controller 851, a memory 852, a network
interface 853, a radio communication interface 855, and a connection interface 857.
The controller 851, the memory 852, and the network interface 853 are the same as the
controller 821, the memory 822, and the network interface 823 described with
reference to FIG. 16.
[0141] The radio communication interface 855 supports any cellular communication scheme
such as LTE and LTE-Advanced, and provides radio communication to a terminal p o
sitioned in a sector corresponding to the RRH 860 via the RRH 860 and the antenna
840. The radio communication interface 855 may typically include, for example, a BB
processor 856. The BB processor 856 is the same as the BB processor 826 described
with reference to FIG. 16, except the BB processor 856 is connected to the RF circuit
864 of the RRH 860 via the connection interface 857. The radio communication
interface 855 may include the multiple BB processors 856, as illustrated in FIG. 17.
For example, the multiple BB processors 856 may be compatible with multiple
frequency bands used by the eNB 830. Although FIG. 17 illustrates the example in
which the radio communication interface 855 includes the multiple BB processors 856,
the radio communication interface 855 may also include a single BB processor 856.
[0142] The connection interface 857 is an interface for connecting the base station apparatus
850 (radio communication interface 855) to the RRH 860. The connection interface
857 may also be a communication module for communication in the above-described
high speed line that connects the base station apparatus 850 (radio communication
interface 855) to the RRH 860.
[0143] The RRH 860 includes a connection interface 861 and a radio communication
interface 863.
[0144] The connection interface 861 is an interface for connecting the RRH 860 (radio com
munication interface 863) to the base station apparatus 850. The connection interface
861 may also be a communication module for communication in the above-described
high speed line.
[0145] The radio communication interface 863 transmits and receives radio signals via the
antenna 840. The radio communication interface 863 may typically include, for
example, the RF circuit 864. The RF circuit 864 may include, for example, a mixer, a
filter, and an amplifier, and transmits and receives radio signals via the antenna 840.
The radio communication interface 863 may include multiple RF circuits 864, as i l
lustrated in FIG. 17. For example, the multiple RF circuits 864 may support multiple
antenna elements. Although FIG. 17 illustrates the example in which the radio commu
nication interface 863 includes the multiple RF circuits 864, the radio communication
interface 863 may also include a single RF circuit 864.
[0146] In the eNB 830 illustrated in FIG. 17, the interval control unit 142, the allocation
control unit 144, and the communication control unit 146 described by using FIG. 6
may be implemented by the radio communication interface 855 and/or the radio com
munication interface 863. Alternatively, at least a part of the elements may be im
plemented by the controller 851. As an example, a module including a part (e.g., the
BB processor 856) or the whole of the radio communication interface 855 and/or the
controller 851 may be mounted on the eNB 830 and the interval control unit 142, the
allocation control unit 144, and the communication control unit 146 may be im
plemented by the module. In this case, the above module may store a program for
causing a processor to function as the interval control unit 142, the allocation control
unit 144, and the communication control unit 146 (in other words, a program for
causing a processor to execute the operations of the interval control unit 142, the al
location control unit 144, and the communication control unit 146) and execute the
program. As another example, a program for causing a processor to function as the
interval control unit 142, the allocation control unit 144, and the communication
control unit 146 may be installed in the eNB 830 and the radio communication
interface 855 (e.g., the BB processor 856) and/or the controller 851 may execute the
program. As described above, the eNB 830, the base station apparatus 850, or the
above module may be provided as an apparatus including the interval control unit 142,
the allocation control unit 144, and the communication control unit 146, or the
program for causing a processor to function as the interval control unit 142, the al
location control unit 144, and the communication control unit 146 may be provided.
Alternatively, a readable recording medium having the above program recorded
thereon may be provided.
[0147] Furthermore, in the eNB 830 illustrated in FIG. 17, the radio communication unit 110
described by using FIG. 6, for example, may be implemented by the radio commu
nication interface 863 (e.g., the RF circuit 864). The network communication unit 120
may be implemented by the controller 851 and/or the network interface 853.
[0148] <6.3. Application Examples Regarding Terminal Apparatus>
(First Application Example)
FIG. 18 is a block diagram illustrating an example of a schematic configuration of a
smartphone 900 to which the technology of an embodiment of the present disclosure
may be applied. The smartphone 900 includes a processor 901, a memory 902, a
storage 903, an external connection interface 904, a camera 906, a sensor 907, a mi
crophone 908, an input device 909, a display device 910, a speaker 9 11, a radio com
munication interface 912, one or more antenna switches 915, one or more antennas
916, a bus 917, a battery 918, and an auxiliary controller 919.
[0149] The processor 901 may be, for example, a CPU or a system on a chip (SoC), and
controls functions of an application layer and another layer of the smartphone 900. The
memory 902 includes RAM and ROM, and stores a program that is executed by the
processor 901, and data. The storage 903 may include a storage medium such as a
semiconductor memory and a hard disk. The external connection interface 904 is an
interface for connecting an external device such as a memory card and a universal
serial bus (USB) device to the smartphone 900.
[0150] The camera 906 includes an image sensor such as a charge coupled device (CCD)
and a complementary metal oxide semiconductor (CMOS), and generates a captured
image. The sensor 907 may include a group of sensors such as a measurement sensor, a
gyro sensor, a geomagnetic sensor, and an acceleration sensor. The microphone 908
converts sounds that are input to the smartphone 900 to audio signals. The input device
909 includes, for example, a touch sensor configured to detect touch onto a screen of
the display device 910, a keypad, a keyboard, a button, or a switch, and receives an
operation or an information input from a user. The display device 910 includes a
screen such as a liquid crystal display (LCD) and an organic light-emitting diode
(OLED) display, and displays an output image of the smartphone 900. The speaker 911
converts audio signals that are output from the smartphone 900 to sounds.
[0151] The radio communication interface 912 supports any cellular communication scheme
such as LTE and LTE-Advanced, and performs radio communication. The radio com
munication interface 912 may typically include, for example, a BB processor 913 and
an RF circuit 914. The BB processor 913 may perform, for example, encoding/
decoding, modulating/demodulating, and multiplexing/demultiplexing, and performs
various types of signal processing for radio communication. Meanwhile, the RF circuit
914 may include, for example, a mixer, a filter, and an amplifier, and transmits and
receives radio signals via the antenna 916. The radio communication interface 913 may
also be a one chip module that has the BB processor 913 and the RF circuit 914 in
tegrated thereon. The radio communication interface 912 may include the multiple BB
processors 913 and the multiple RF circuits 914, as illustrated in FIG. 18. Although
FIG. 18 illustrates the example in which the radio communication interface 913
includes the multiple BB processors 913 and the multiple RF circuits 914, the radio
communication interface 912 may also include a single BB processor 913 or a single
RF circuit 914.
[0152] Furthermore, in addition to a cellular communication scheme, the radio commu
nication interface 912 may support another type of radio communication scheme such
as a short-distance wireless communication scheme, a near field communication
scheme, and a radio local area network (LAN) scheme. In that case, the radio commu
nication interface 912 may include the BB processor 913 and the RF circuit 914 for
each radio communication scheme.
[0153] Each of the antenna switches 915 switches connection destinations of the antennas
916 among multiple circuits (such as circuits for different radio communication
schemes) included in the radio communication interface 912.
[0154] Each of the antennas 916 includes a single or multiple antenna elements (such as
multiple antenna elements included in an MIMO antenna), and is used for the radio
communication interface 912 to transmit and receive radio signals. The smartphone
900 may include the multiple antennas 916, as illustrated in FIG. 18. Although FIG. 18
illustrates the example in which the smartphone 900 includes the multiple antennas
916, the smartphone 900 may also include a single antenna 916.
[0155] Furthermore, the smartphone 900 may include the antenna 916 for each radio com
munication scheme. In that case, the antenna switches 915 may be omitted from the
configuration of the smartphone 900.
[0156] The bus 917 connects the processor 901, the memory 902, the storage 903, 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 radio communication
interface 912, and the auxiliary controller 919 to each other. The battery 918 supplies
power to blocks of the smartphone 900 illustrated in FIG. 18 via feeder lines, which
are partially shown as dashed lines in the figure. The auxiliary controller 919 operates
a minimum necessary function of the smartphone 900, for example, in a sleep mode.
[0157] In the smartphone 900 illustrated in FIG. 18, the control unit 230 described by using
FIG. 8 may be implemented by the radio communication interface 912. Alternatively,
at least a part of the elements may be implemented by the processor 901 or the
auxiliary controller 919. As an example, a module including a part (e.g., the BB
processor 913) or the whole of the radio communication interface 912, the processor
901, and/or the auxiliary controller 919 may be mounted on the smartphone 900 and
the control unit 230 may be implemented by the module. In this case, the above
module may store a program for causing a processor to function as the control unit 230
(in other words, a program for causing a processor to execute the operations of the
control unit 230) and execute the program. As another example, a program for causing
a processor to function as the control unit 230 may be installed in the smartphone 900
and the radio communication interface 912 (e.g., the BB processor 913), the processor
901, and/or the auxiliary controller 919 may execute the program. As described above,
the smartphone 900 or the above module may be provided as an apparatus including
the control unit 230, or the program for causing a processor to function as the control
unit 230 may be provided. Alternatively, a readable recording medium having the
above program recorded thereon may be provided.
[0158] Furthermore, in the smartphone 900 illustrated in FIG. 18, the radio communication
unit 210 described by using FIG. 8, for example, may be implemented by the radio
communication interface 912 (e.g., the RF circuit 914).
[0159] (Second Application Example)
FIG. 19 is a block diagram illustrating an example of a schematic configuration of a
car navigation apparatus 920 to which the technology of an embodiment of 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 928, an input device
929, a display device 930, a speaker 931, a radio communication interface 933, one or
more antenna switches 936, one or more antennas 937, and a battery 938.
[0160] The processor 921 may be, for example, a CPU or a SoC, and controls a navigation
function and another function of the car navigation apparatus 920. The memory 922
includes RAM and ROM, and stores a program that is executed by the processor 921,
and data.
[0161] The GPS module 924 uses GPS signals received from a GPS satellite to measure a
position (such as latitude, longitude, and altitude) of the car navigation apparatus 920.
The sensor 925 may include a group of sensors such as a gyro sensor, a geomagnetic
sensor, and an air pressure sensor. The data interface 926 is connected to, for example,
an in-vehicle network 941 via a terminal that is not shown, and acquires data generated
by the vehicle, such as vehicle speed data.
[0162] The content player 927 reproduces content stored in a storage medium (such as a CD
and a DVD) that is inserted into the storage medium interface 928. The input device
929 includes, for example, a touch sensor configured to detect touch onto a screen of
the display device 930, a button, or a switch, and receives an operation or an in
formation input from a user. The display device 930 includes a screen such as a LCD
or an OLED display, and displays an image of the navigation function or content that is
reproduced. The speaker 931 outputs sounds of the navigation function or the content
that is reproduced.
[0163] The radio communication interface 933 supports any cellular communication scheme
such as LET and LTE-Advanced, and performs radio communication. The radio com
munication interface 933 may typically include, for example, a BB processor 934 and
an RF circuit 935. The BB processor 934 may perform, for example, encoding/
decoding, modulating/demodulating, and multiplexing/demultiplexing, and performs
various types of signal processing for radio communication. Meanwhile, the RF circuit
935 may include, for example, a mixer, a filter, and an amplifier, and transmits and
receives radio signals via the antenna 937. The radio communication interface 933 may
be a one chip module having the BB processor 934 and the RF circuit 935 integrated
thereon. The radio communication interface 933 may include the multiple BB
processors 934 and the multiple RF circuits 935, as illustrated in FIG. 19. Although
FIG. 19 illustrates the example in which the radio communication interface 933
includes the multiple BB processors 934 and the multiple RF circuits 935, the radio
communication interface 933 may also include a single BB processor 934 or a single
RF circuit 935.
[0164] Furthermore, in addition to a cellular communication scheme, the radio commu
nication interface 933 may support another type of radio communication scheme such
as a short-distance wireless communication scheme, a near field communication
scheme, and a radio LAN scheme. In that case, the radio communication interface 933
may include the BB processor 934 and the RF circuit 935 for each radio commu
nication scheme.
[0165] Each of the antenna switches 936 switches connection destinations of the antennas
937 among multiple circuits (such as circuits for different radio communication
schemes) included in the radio communication interface 933.
[0166] Each of the antennas 937 includes a single or multiple antenna elements (such as
multiple antenna elements included in an MIMO antenna), and is used for the radio
communication interface 933 to transmit and receive radio signals. The car navigation
apparatus 920 may include the multiple antennas 937, as illustrated in FIG. 19.
Although FIG. 19 illustrates the example in which the car navigation apparatus 920
includes the multiple antennas 937, the car navigation apparatus 920 may also include
a single antenna 937.
[0167] Furthermore, the car navigation apparatus 920 may include the antenna 937 for each
radio communication scheme. In that case, the antenna switches 936 may be omitted
from the configuration of the car navigation apparatus 920.
[0168] The battery 938 supplies power to blocks of the car navigation apparatus 920 i l
lustrated in FIG. 19 via feeder lines that are partially shown as dashed lines in the
figure. The battery 938 accumulates power supplied from the vehicle.
[0169] In the car navigation apparatus 920 illustrated in FIG. 19, the control unit 230
described by using FIG. 8 may be implemented by the radio communication interface
933. Alternatively, at least a part of the elements may be implemented by the processor
921. As an example, a module including a part (e.g., the BB processor 934) or the
whole of the radio communication interface 933 and/or the processor 921 may be
mounted on the car navigation apparatus 920 and the control unit 230 may be im
plemented by the module. In this case, the above module may store a program for
causing a processor to function as the control unit 230 (in other words, a program for
causing a processor to execute the operations of the control unit 230) and execute the
program. As another example, a program for causing a processor to function as the
control unit 230 may be installed in the car navigation apparatus 920 and the radio
communication interface 933 (e.g., the BB processor 934) and/or the processor 921
may execute the program. As described above, the car navigation apparatus 920 or the
above module may be provided as an apparatus including the control unit 230, or the
program for causing a processor to function as the control unit 230 may be provided.
Alternatively, a readable recording medium having the above program recorded
thereon may be provided.
[0170] Furthermore, in the car navigation apparatus 920 illustrated in FIG. 19, the radio
communication unit 210 described by using FIG. 8, for example, may be implemented
by the radio communication interface 933 (e.g., the RF circuit 935).
[0171] The technology of an embodiment of the present disclosure may also be realized as
an in-vehicle 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 control unit 230. The vehicle module 942 generates vehicle data such as vehicle
speed, engine speed, and trouble information, and outputs the generated data to the invehicle
network 941.
[0172] <7. Conclusion>
An embodiment of the present disclosure has been described in detail with reference
to FIGS. 1 to 19. As described above, the communication control apparatus 100
performs communication with a radio communication apparatus of a communication
system in which IDMA is used, and dynamically changes the interval of allocation of
an interleaver used for IDMA in the base station 100 or the terminal apparatus 200.
Specifically, the communication control apparatus 100 changes an interleaver al
location interval to a time longer than the minimum TTI. Thus, interleaver allocation is
performed on the base station 100 and the terminal apparatus 200 at a time interval
longer than that of a dynamic allocation policy. This makes it possible to reduce
overhead related to interleaver allocation in the communication system 1 in which
IDMA is adopted.
[0173] Furthermore, the communication control apparatus 100 can dynamically change an
interleaver allocation interval based on communication environment information such
as a QCI, a statistic related to a packet transmitted and received by the terminal
apparatus 200, or the category of an application. Thus, for example, the allocation
interval can be changed in accordance with the situation of interference of the terminal
apparatus 200, which allows more flexible scheduling.
[0174] Furthermore, the communication control apparatus 100 can set an interleaver al
location interval to a time corresponding to a resource allocation interval for another
multiple access scheme. Thus, the communication control apparatus 100 can col
lectively perform signaling related to interleaver allocation and resource allocation for
another multiple access scheme. This can reduce overhead related to notification of an
allocation result.
[0175] It should be understood by those skilled in the art that various modifications, com
binations, sub-combinations and alterations may occur depending on design re
quirements and other factors insofar as they are within the scope of the appended
claims or the equivalents thereof.
[0176] For example, in the above embodiment, the interval control unit 142, the allocation
control unit 144, and the communication control unit 146 are described to be im
plemented as a logical entity and included in the control unit 140; however, an em
bodiment of the present technology is not limited to such an example. For example, all
or part of the interval control unit 142, the allocation control unit 144, and the commu
nication control unit 146 may be included in the physical layer controller 112. Alter
natively, all or part of the interval control unit 142, the allocation control unit 144, and
the communication control unit 146 may be implemented as an independent physical
entity. For example, all or part of the interval control unit 142, the allocation control
unit 144, and the communication control unit 146 may be included in a server or the
like on the core network 400 and the rest of the elements may be included in the base
station 100.
[0177] Note that it is not necessary for the processing described in this specification with
reference to the flowchart to be executed in the order shown in the flowchart. Some
processing steps may be performed in parallel. Further, some of additional steps can be
adopted, or some processing steps can be omitted.
[0178] In addition, the effects described in the present specification are merely illustrative
and demonstrative, and not limitative. In other words, the technology according to an
embodiment of the present disclosure can exhibit other effects that are evident to those
skilled in the art along with or instead of the effects based on the present specification.
[0179] Additionally, the present technology may also be configured as below.
(1)
A communication control apparatus including:
a communication unit configured to perform communication with a radio commu
nication apparatus of a communication system in which interleave division multiple
access (IDMA) is used; and
an interval control unit configured to dynamically change an interval of allocation of
an interleaver used for IDMA by the radio communication apparatus.
(2)
The communication control apparatus according to (1),
wherein the interval control unit changes the interval based on information related to
communication by the radio communication apparatus.
(3)
The communication control apparatus according to (2),
wherein the interval control unit changes the interval based on a quality of service class
identifier (QCI).
(4)
The communication control apparatus according to (2) or (3),
wherein the interval control unit changes the interval based on information indicating a
statistic related to a packet transmitted or received by the radio communication
apparatus.
(5)
The communication control apparatus according to any one of (2) to (4),
wherein the interval control unit changes the interval based on information indicating a
category of an application used by the radio communication apparatus.
(6)
The communication control apparatus according to any one of (1) to (5),
wherein the interval control unit sets the interval to a time corresponding to a resource
allocation interval for another access scheme.
(7)
The communication control apparatus according to any one of (1) to (6),
wherein the communication unit transmits information indicating the interval to the
radio communication apparatus.
(8)
The communication control apparatus according to any one of (1) to (7), further
including:
an allocation control unit configured to allocate the interleaver at the interval set by the
interval control unit.
(9)
The communication control apparatus according to (8),
wherein the allocation control unit allocates the interleaver based on information
related to communication by the radio communication apparatus.
(10)
The communication control apparatus according to (9),
wherein the allocation control unit allocates the interleaver based on a QCI.
(ID
The communication control apparatus according to (9) or (10),
wherein the allocation control unit allocates the interleaver in accordance with an al
location rule corresponding to information related to communication by the radio com
munication apparatus.
(12)
The communication control apparatus according to (11),
wherein the allocation control unit allocates the interleaver in accordance with an al
location rule corresponding to a QCI.
(13)
The communication control apparatus according to any one of (1) to (12),
wherein the interval control unit changes the interval to a time longer than a minimum
TTI.
(14)
The communication control apparatus according to any one of (1) to (13),
wherein the interval control unit changes the interval to a time equal to a minimum
TTI.
(15)
A radio communication apparatus including:
a radio communication unit configured to perform radio communication using IDMA
with another radio communication apparatus; and
a control unit configured to control the radio communication unit to cause the radio
communication unit to perform interleave processing using an interleaver allocated at
an interval that is dynamically changed.
(16)
The radio communication apparatus according to (15),
wherein the control unit controls the radio communication unit to cause the radio com
munication unit to transmit, in accordance with a situation of communication by the
radio communication unit, a message requesting a change of the interval or allocation
of the interleaver.
(17)
A communication control method including:
performing communication with a radio communication apparatus of a communication
system in which IDMA is used; and
dynamically changing, by a processor, an interval of allocation of an interleaver used
for IDMA by the radio communication apparatus.
(18)
A radio communication method including:
performing radio communication using IDMA with another radio communication
apparatus; and
performing control, by a processor, to cause interleave processing using an interleaver
allocated at an interval that is dynamically changed to be performed.
(19)
A program causing a computer to function as:
a communication unit configured to perform communication with a radio commu
nication apparatus of a communication system in which IDMA is used; and
an interval control unit configured to dynamically change an interval of allocation of
an interleaver used for IDMA by the radio communication apparatus.
(20)
A program causing a computer to function as:
a radio communication unit configured to perform radio communication using IDMA
with another radio communication apparatus; and
a control unit configured to control the radio communication unit to cause the radio
communication unit to perform interleave processing using an interleaver allocated at
an interval that is dynamically changed.
(21)
A communication control apparatus comprising:
circuitry configured to
communicate with a radio communication apparatus of a communication system that
uses interleave division multiple access (IDMA), and
controllably change an interval of allocation of an interleaver used for IDMA by the
radio communication apparatus.
(22)
The communication control apparatus according to (21),
wherein the circuitry is configured to change the interval based on information related
to communication by the radio communication apparatus.
(23)
The communication control apparatus according to (22),
wherein the circuitry is configured to change the interval based on a quality of service
class identifier (QCI).
(24)
The communication control apparatus according to (22),
wherein the circuitry is configured to change the interval based on packet commu
nication statistics information.
(25)
The communication control apparatus according to (22),
wherein the circuitry is configured to change the interval based on information in
dicating a category of an application used by the radio communication apparatus.
(26)
The communication control apparatus according to (21),
wherein the circuitry is configured to set the interval to a time corresponding to a
resource allocation interval of another access scheme.
(27)
The communication control apparatus according to (21),
wherein the circuitry is configured to transmit information indicating the interval to the
radio communication apparatus.
(28)
The communication control apparatus according to (21), wherein the circuitry is
further configured to allocate the interleaver at the interval previously set by the
circuitry.
(29)
The communication control apparatus according to (28),
wherein the circuitry is configured to allocate the interleaver based on information
related to communications conducted by the radio communication apparatus.
(30)
The communication control apparatus according to (29),
wherein the circuitry is configured to allocate the interleaver based on a QCI.
(31)
The communication control apparatus according to (29),
wherein the circuitry is configured to allocate the interleaver in accordance with an a l
location rule that corresponds to information related to communications conducted by
the radio communication apparatus.
(32)
The communication control apparatus according to (21),
wherein the circuitry is configured to allocate the interleaver in accordance with an a l
location rule corresponding to a QCI.
(33)
The communication control apparatus according to (21),
wherein the circuitry is configured to change the interval to a time longer than a
minimum TTI.
(34)
The communication control apparatus according to (21),
wherein the circuitry is configured to change the interval to a time equal to a minimum
TTI.
(35)
The communication control apparatus according to (21),
wherein the circuitry is configured to controllably change the interval of allocation
based on a predetermined policy.
(36)
The communication control apparatus according to (35),
wherein the predetermined policy dictates a selection between dynamic and quasistatic.
(37)
A radio communication apparatus comprising:
an interleaver; and
circuitry configured to
perform radio communication using IDMA with another radio communication
apparatus, and
controllably change an interval allocated of the interleaver.
(38)
The radio communication apparatus according to (37),
wherein the circuitry is configured to transmit a message requesting a change of the
interval.
(39)
A communication control method comprising:
performing communication with a radio communication apparatus of a communication
system in which IDMA is used; and
controllably changing, with circuitry, an interval of allocation of an interleaver used for
IDMA by the radio communication apparatus.
(40)
The radio communication method of (39), wherein the controllably changing includes
changing to one of a dynamic allocation and a quasi-static allocation.
Reference Signs List
1 communication system
100 communication control apparatus, base station
110 radio communication unit
112 physical layer controller
114 interleave unit
120 network communication unit
130 storage unit
140 control unit
142 interval control unit
144 allocation control unit
146 communication control unit
200 terminal apparatus
210 radio communication unit
212 physical layer controller
214 interleave unit
220 storage unit
230 control unit
300 cell
400 core network

Claims
A communication control apparatus comprising:
circuitry configured to
communicate with a radio communication apparatus of a commu
nication system that uses interleave division multiple access (IDMA),
and
controllably change an interval of allocation of an interleaver used for
IDMA by the radio communication apparatus.
The communication control apparatus according to claim 1,
wherein the circuitry is configured to change the interval based on in
formation related to communication by the radio communication
apparatus.
The communication control apparatus according to claim 2,
wherein the circuitry is configured to change the interval based on a
quality of service class identifier (QCI).
The communication control apparatus according to claim 2,
wherein the circuitry is configured to change the interval based on
packet communication statistics information.
The communication control apparatus according to claim 2,
wherein the circuitry is configured to change the interval based on in
formation indicating a category of an application used by the radio
communication apparatus.
The communication control apparatus according to claim 1,
wherein the circuitry is configured to set the interval to a time corre
sponding to a resource allocation interval of another access scheme.
The communication control apparatus according to claim 1,
wherein the circuitry is configured to transmit information indicating
the interval to the radio communication apparatus.
The communication control apparatus according to claim 1, wherein
the circuitry is further configured to allocate the interleaver at the
interval previously set by the circuitry.
The communication control apparatus according to claim 8,
wherein the circuitry is configured to allocate the interleaver based on
information related to communications conducted by the radio commu
nication apparatus.
The communication control apparatus according to claim 9,
wherein the circuitry is configured to allocate the interleaver based on a
PCT/JP2015/005551
QCI.
The communication control apparatus according to claim 9,
wherein the circuitry is configured to allocate the interleaver in ac
cordance with an allocation rule that corresponds to information related
to communications conducted by the radio communication apparatus.
The communication control apparatus according to claim 11,
wherein the circuitry is configured to allocate the interleaver in ac
cordance with an allocation rule corresponding to a QCI.
The communication control apparatus according to claim 1,
wherein the circuitry is configured to change the interval to a time
longer than a minimum TTI.
The communication control apparatus according to claim 1,
wherein the circuitry is configured to change the interval to a time
equal to a minimum TTI.
The communication control apparatus according to claim 1,
wherein the circuitry is configured to controllably change the interval
of allocation based on a predetermined policy.
The communication control apparatus according to claim 15,
wherein the predetermined policy dictates a selection between dynamic
and quasi-static.
A radio communication apparatus comprising:
an interleaver; and
circuitry configured to
perform radio communication using IDMA with another radio commu
nication apparatus, and
controllably change an interval allocated of the interleaver.
The radio communication apparatus according to claim 17,
wherein the circuitry is configured to transmit a message requesting a
change of the interval.
A communication control method comprising:
performing communication with a radio communication apparatus of a
communication system in which IDMA is used; and
controllably changing, with circuitry, an interval of allocation of an in
terleaver used for IDMA by the radio communication apparatus.
The radio communication method of claim 19, wherein the controllably
changing includes changing to one of a dynamic allocation and a quasistatic
allocation.