COMMUNICATION CONTROL DEVICE, COMMUNICATION CONTROL
5 METHOD, AND COMMUNICATION DEVICE
Technical Field [0001]
The present disclosure relates to a communication control device, a 10 communication control method, and a communication device.
Background Art [0002]
Wireless communication environments of recent years are facing the
15 problem of depletion of frequency resources, which has been caused by soaring amounts of data traffic. Thus, active discussions have been exchanged with regard to a framework for opening frequency bands that were authorized for use by specific business operators but are not being used for secondary communication. The framework for secondary communication is referred to as Licensed Shared Access
20 (LSA). For example, the European Conference of Postal and Telecommunications Administrations (CEPT) suggests technical requirements for devices that secondarily use so-called "TV white spaces" (White Space Devices, or WSDs) that are not being used for television broadcasting in Non-Patent Literature 1 below. [0003]
25 Generally, transmission power of a transmitter that uses a frequency band
secondarily is restricted from causing unfavorable interference with a receiver of a primary system. For example, Non-Patent Literature 1 below proposes deployment of a geo-location database (GLDB) which provides information on the coverage of digital terrestrial television (DTT) systems that are primary systems,
30 positions of DTT receivers, tolerable interference levels, and the like in order to appropriately control transmission power of a WSD. Since use of frequency bands

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is normally authorized by country (or region), a different GLDB may be deployed for
each country (or region).
[0004]
Non-Patent Literature 3 below proposes, for example, a country or a third 5 party installing an advanced geo-location engine (AGLE) which uses information provided from a GLDB for maximizing a system capacity of a secondary system through more advanced calculation. The frequency managing agent of the UK, the Office of Communications (OfCom), and a third party database provider have decided to employ the approach of installing an AGLE . 10 [0005]
In addition, in Non-Patent Literature 4 below, a technology of coexistence of devices which use a frequency band secondarily is discussed.
Citation List 15 Non-Patent Literature [0006]
Non-Patent Literature 1: Electronic Communications Committee (ECC), "TECHNICAL AND OPERATIONAL REQUIREMENTS FOR THE POSSIBLE OPERATION OF COGNITIVE RADIO SYSTEMS IN THE 'WHITE SPACES' OF 20 THE FREQUENCY BAND 470 TO 790 MHz," ECC REPORT 159, January 2011
Non-Patent Literature 2: Electronic Communications Committee (ECC),
"Complementary Report to ECC Report 159; Further definition of technical and
operational requirements for the operation of white space devices in the band 470 to
790 MHz," ECC REPORT 185, September 2012
25 Non-Patent Literature 3: Naolaka Sato (Sony Corporation), "TV WHITE
SPACE AS PART OF THE FUTURE SPECTRUM LANDSCAPE FOR WIRELESS COMMUNICATIONS," ETSI Workshop on Rcconfigurable Radio Systems, December 12, 2012, Cannes (France)
Non-Patent Literature 4: Draft ETSI TS 102 946, Reconfigurable Radio 30 Systems (RRS); System Requirements for Operation in UHF TV Band White Spaces

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Summary of Invention Technical Problem [0007]
However, influence of wireless communication of a primary system on
5 wireless communication of a secondary system which secondarily uses a frequency
band for the primary system has not been carefully considered. That is to say,
influence of transmission power of a transmitter of a primary system on a receiver of
a secondary system has not been carefully considered. For this reason, transmission
power of the primary system can have significant influence on wireless
10 communication of the secondary system. As a result, a decrease of the tlii'oughput
of the secondary system is a concern. In addition, the same problem can arise not
only in the secondary system with respect to TV white spaces but also in the case of
a mobile communication system in which a small cell that is partly or entirely
overlapped by a macro cell is disposed.
15 [0008]
Thus, even when there are a transmitter and a receiver both using the same or close frequency bands, it is desirable to provide a framework in which more desirable wireless communication can be performed through the receiver.
20 Solution to Problem [0009]
According to the present disclosure, there is provided a communication control device that controls wireless communication in compliance with a time division duplex (TDD) scheme, the communication control device including; a
25 selection unit configured to select a link direction configuration for the wireless communication among a plurality of candidates for the link direction configuration which indicates a link direction in units of sub-frames of a radio frame which includes a plurality of sub-frames; and an application unit configured to apply the selected link direction configuration to the wireless communication. The plurality
30 of candidates include at least one of a link direction configuration dedicated to a downlink and a link direction configuration dedicated to an uplink.

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[0010]
According to the present disclosure, there is provided a communication control method for controlling wireless communication in compliance with a time division duplex (TDD) scheme, the communication control method including: 5 selecting a link direction configuration for the wireless communication among a plurality of candidates for the link direction configuration which indicates a link direction in units of sub-frames of a radio frame which includes a plurality of sub-frames; and applying the selected link direction configuration to the wireless communication. The plurality of candidates include at least one of a link direction
10 configuration dedicated to a downlink and a link direction configuration dedicated to an uplink. [0011]
According to the present disclosure, there is provided a communication control device including: a recognition unit configured to recognize a frequency
15 channel on which wireless communication is performed in compliance with a time division duplex (TDD) scheme; and a decision unit configured to, when the wireless communication is performed on two or more frequency channels, decide one or more candidates selectable to be applied to wireless communication of each of the frequency channels among a plurality of candidates for a link direction configuration
20 that indicates a link direction in units of sub-frames of a radio frame that includes a plurality of sub-frames for each of the frequency channels included in the two or more frequency channels, on the basis of information relating to the distance between an interference frequency channel on which an interference signal is transmitted and each of the frequency channels in a frequency direction. The plurality of candidates
25 include at least one of a link direction configuration dedicated to a downlink and a link direction configuration dedicated to an uplink. [0012]
According to the present disclosure, there is provided a communication device that controls wireless communication in compliance with a time division
30 duplex (TDD) scheme, the communication device including: a recognition unit configured to recognize a link direction configuration to be applied to the wireless

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communication among a plurality of candidates for the link direction configuration that indicates a link direction in units of sub-frames of a radio frame that includes a plurality of sub-frames; and a communication control unit configured to control the wireless communication in compliance with the recognized link direction 5 configuration. The plurality of candidates include at least one of a link direction configuration dedicated to a downlink and a link direction configuration dedicated to an uplink.
Advantageous Effects of Invention 10 [0013]
According to the present disclosure described above, even when there are a transmitter and a receiver both using the same or close frequency bands, more desirable wireless communication can be performed through the receiver.
15 Brief Description of Drawings
[0014]
[FIG. 1] FIG. 1 is an illustrative diagram for describing specific examples of TDD
configurations.
[FIG. 2] FIG. 2 is an illustrative diagram for describing an example of influence that 20 transmission power of a primary system has on an uplink of a secondary system.
[FIG. 3] FIG. 3 is an illustrative diagram for describing an example of influence that
transmission power of the primary system has on a downlink of the secondary system.
[FIG. 4] FIG 4 is an illustrative diagram for describing an example of the comparison
result of the SINR of an uplink and the SINR of a downlink of a WSD. 25 [FIG. 5] FIG. 5 is an illustrative diagram for describing an example of interference
from a frequency channel of a primary system in each frequency channel used in a
secondary system.
[FIG. 6] FIG. 6 is an illustrative diagram for describing a TDD configuration
dedicated to a downlink. 30 [FIG. 7] FIG. 7 is an illustrative diagram for describing TDD configurations
dedicated to uplinks.

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[FIG. 8] FIG. 8 is an illustrative diagram illustrating an example of a schematic
configuration of a communication system according to an embodiment of the present
disclosure.
[FIG. 9] FIG. 9 is a block diagram illustrating an example of a configuration of an 5 AGLB according to an embodiment.
[FIG. 10] FIG. 10 is an illustrative diagram for describing an example of available
channels for a secondary system.
[FIG. 11] FIG. 11 is an illustrative diagram for describing an example of available
channel related information to which information on selectable candidates is added. 10 [FIG. 12] FIG. 12 is a block diagram illustrating an example of a configuration of a
master WBS according to an embodiment.
[FIG. 13] FIG. 13 is a block diagram illustrating an example of a configuration of a
slave WSD according to an embodiment.
[FIG. 14] FIG. 14 is a sequence diagram illustrating an example of the schematic 15 flow of a communication control process according to an embodiment.
[FIG. 15] FIG. 15 is a sequence diagram illustrating an example of the schematic
flow of a communication control process according to a first modified example of an
embodiment.
[FIG. 16] FIG. 16 is a sequence diagram illustrating an example of the schematic 20 flow of a communication control process according to a second modified example of
an embodiment.
[FIG. 17] FIG. 17 is an illustrative diagram for describing an example of disposition
of each device which is a premise of a third embodiment.
[FIG. 18A] FIG 18A is a first sequence diagram illustrating an example of the 25 schematic flow of a communication control process according to a third modified
example of an embodiment.
[FIG. 18B] FIG. 18B is a second sequence diagram illustrating an example of the
schematic flow of the communication control process according to the third modified
example of an embodiment. 30 [FIG. 19] FIG. 19 is an illustrative diagram for describing another example of
disposition of a CRM.

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[FIG. 20] FIG. 20 is an illustrative diagram for describing still another example of
disposition of CRMs.
[FIG. 21] FIG. 21 is a block diagram illustrating an example of a schematic
configuration of a server to which the technology according to the present disclosure 5 can be applied.
[FIG. 22] FIG. 22 is a block diagram illustrating a first example of a schematic
configuration of an eNB to which the technology according to the present disclosure
can be applied.
[FIG. 23] FIG. 23 is a block diagram illustrating a second example of the schematic 10 configuration of the eNB to which the teclmology according to the present disclosure
can be applied.
[FIG. 24] FIG. 24 is a block diagram illustrating an example of a schematic
configuration of a smartphone to which the technology according to the present
disclosure can be applied. 15 [FIG. 25] FIG. 25 is a block diagram illustrating an example of a schematic
configuration of a car navigation apparatus to which the technology according to the
present disclosure can be applied.
Description of Embodiments 20 [0015]
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 drawings, elements that have substantially the same function and structure are denoted with the same reference signs, and repeated explanation is 25 omitted. [0016]
Description will be provided in the following order. 1. Introduction
1.1 Trend of a duplex scheme
30 1.2. Technical problem
1.3. New technique according to an embodiment


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2. Schematic configuration of a communication system according to an
embodiment
3. Configuration of each device
3.1. Configuration of an AGLE
5 3.2. Configuration of a master WSD
3.3. Configuration of a slave WSD
4. Flow of a process
5. Modified examples
5.1. First modified example
10 5.2. Second modified example
5.3. Third modified example
6. Application examples
6.1. Application example of an AGLE and a GLDB
6.2. Application example of a master WSD 15 6.3. Application example of a slave WSD
7. Conclusion
[0017]
«I. Introduction»
First, a trend, a technical problem, and a new technique according to an 20 embodiment with respect to a duplex scheme will be described. [0018] <1.1. Trend of a duplex scheme>
As duplex schemes with respect to TV white spaces, frequency division duplex (FDD) or time division duplex (TDD) can be employed. In FDD, a 25 frequency channel for an uplink and a frequency channel for a downlink are prepared separately, but in TDD, a frequency channel can be flexibly allocated to an uplink and a downlink. [0019]
In addition, the more flexible TDD is considered to be desirable as a duplex
30 scheme with respect to the TV white spaces. More flexible allocation to an uplink
and a downlink is favorable because a frequency channel used in a primary system

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depends on the states of channels at each location. It is also because a protocol that operates in earner sense multiple access (CSMA) or time division multiple access (TDMA) based on TDD in super Wi-Fi (defined in IEEE 802.11 af and IEEE 802.22) that is a dominant radio access technology (RAT) of WSDs is employed. In 5 addition, active movements of using frequency bands secondarily through Time Division Long Term Evolution (TD-LTE) have recently appeared in Europe. [0020]
It should be noted that, in TDD, a plurality of sub-frames are included in a radio frame and a link direction (for example, a downlink or an uplink) is set in units
10 of sub-frames. To be more specific, a plurality of candidates for a link direction configuration (i.e., TDD configuration) which indicates a link direction in units of sub-frames are prepared in a radio frame in advance. In addition, any candidate among the plurality of candidates is set. Specific examples of a plurality of candidates for a TDD configuration will be described below with reference to FIG. 1.
15 [0021J
FIG. 1 is an illustrative diagram for describing the specific examples of TDD configurations. Referring to FIG. 1, 7 TDD configurations (Configurations 0 to 6) that are defined in the technical standard of 3rd Generation Partnership Project (3GPP) (TS 36.211 Table 4.2-2: Uplink-downlink configuration) are shown. In the
20 TDD configurations, each sub-frame is any of a downlink frame that is a sub-frame for a downlink, an uplink frame that is a sub-frame for an uplink, and a special sub-frame. Special sub-frames are provided at the time of switching of a downlink sub-frame and an uplink sub-frame in order to consider a propagation delay from a base station to a terminal device.
25 [0022]
As illustrated in FIG 1, each of the TDD configurations has a different ratio of the number of sub-frames for an uplink to the number of sub-frames for a downlink. For example, when the special sub-frames are considered as sub-frames for a downlink, the TDD configuration that has the maximum ratio of sub-frames for
30 a downlink (i.e., the downlink sub-frames and the special sub-frames) to the total number of sub-frames is Configuration 5. The ratio of the sub-frames for a

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downlink of this case is nine out of ten. On the other hand, the TDD configuration that has the maximum ratio of sub-frames for an uplink to the total number of sub-frames is Configuration 0. The ratio of the sub-frames for an uplink (i.e., uplink sub-frames) in this case is six out often. 5 [0023]
<1.2. Technical problem>
In general, transmission power of a transmitter that uses a frequency band secondarily is restricted from causing unfavorable interference with a receiver of a primary system. However, influence of transmission power of a transmitter of a
10 primary system on a receiver of a secondary system that secondarily uses a frequency band has not been carefully considered. For this reason, transmission power of a primary system can significantly influence a secondary system. Examples of the influence of transmission power of a primary system on a secondary system will be described below with reference to FIGS. 2, 3, and 4.
15 [0024]
FIG. 2 is an illustrative diagram for describing an example of the influence that transmission power of a primary system has on an uplink of a secondary system. Referring to FIG. 2, a transmitter 10 of a broadcast system which is the primary system, and a master WSD 20 and a slave WSD 30 of the secondary system are
20 illustrated. As illustrated in FIG. 2, the transmitter 10 of the broadcast system is normally installed at a very high position so that radio waves reach distant places. In addition, the master WSD 20 that serves as an access point or a base station is also installed at a higher position than the slave WSD 30. In this case, there is a high possibility of the propagation path from the transmitter 10 to the master WSD 20
25 being an estimated propagation path. Furthermore, transmission power of the transmitter 10 can be very high. For these reasons, the transmission power of the transmitter 10 can significantly influence the master WSD 20. That is to say, a transmission signal of the transmitter 10 can seriously interfere with an uplink signal that the master WSD 20 receives. In this manner, the transmission power of the
30 primary system can have significant influence on the uplink of the secondary system. [0025]

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FIG. 3 is an illustrative diagram for describing an example of influence that the transmission power of the primary system has on a downlink of the secondary system. Referring to FIG. 3, the transmitter 10 of the broadcast system which is the primary system, and the master WSD 20 and the slave WSD 30 of the secondary 5 system are illustrated as in FIG. 2. The transmitter 10 of the broadcast system is normally installed at a very high position and the master WSD 20 is installed at a higher position than the slave WSD 30 as described above. In this case, there is a high possibility of the propagation path from the transmitter 10 to the slave WSD 30 not being an estimated propagation path. For this reason, influence that
10 transmission power of the transmitter 10 has on the slave WSD 30 is smaller than the influence that the transmission power of the transmitter 10 has on the master WSD 20. In this manner, the provision that the transmission power of the primary system gives to the downlink of the secondary system can be smaller than the influence that the transmission power of the primary system has on the uplink of the secondary
15 system. [0026]
FIG. 4 is an illustrative diagram for describing an example of the comparison result of the signal-to-interference and noise power ratios (SINR) of an uplink and SINRs of a downlink of a WSD. Referring to FIG. 4, an uplink
20 characteristic of the case illustrated in FIG. 2 and a downlink characteristic of the case illustrated in FIG. 3 are shown. To be more specific, cumulative distribution functions (CDFs) of SINRs of each of the uplink and downlink are shown. In this example, the values defined in Annex 1 of ECC Report 186 are used for operation parameters of the primary system and secondary system. As a result, the SINRs of
25 the uplink are lower than the SINRs of the downlink as illustrated in FIG. 4. [0027]
As described above, on the premise that the transmitter of the primary system is separated from the devices of the secondary system to some extent, the influence of the primary system on the secondary system strongly appears for the
30 master WSD 20 that is at a higher position, regardless of the planar positional relation between the master WSD 20 and the slave WSD 30. In other words, the

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influence of the primary system on the secondary system strongly appears for an
uplink.
[0028]
Such influence of the primary system on the secondary system can be 5 particularly remarkable when TDD is employed as the duplex scheme. A specific example of this subject will be described with reference to FIG. 5 below. [0029]
FIG. 5 is an illustrative diagram for describing an example of interference from a frequency channel of a primary system in each frequency channel used in a
10 secondary system. Referring to FIG. 5, a primary channel that is a frequency channel used in wireless communication of a primary system and three secondary channels that are frequency channels used in wireless communication of a secondary system are shown. More serious interference occurs in the secondary channel (for example, Secondary channel #1) that is closer to the primary channel due to oul-of-
15 band radiation from the primary channel as illustrated in FIG. 5. In other words, in the secondary channel (for example, Secondary channel #1) that is closer to the primary channel, the SINR of an uplink is particularly lower than the SINR of a downlink. As a result, the throughput of the secondary system can decrease. [0030]
20 Thus, even when there are the transmitter and the receiver that use the same
or a close frequency band, desirable wireless communication can be performed through the receiver in the present embodiment. To be more specific, for example, more desirable wireless communication can be performed through a WSD. [0031]
25 <1.3. New technique according to an embodiment - Definition of new TDD configurations
As already described with reference to FIG. 1, for example, 7 TDD configurations are defined by the 3GPR Particularly in the present embodiment, new TDD configurations are defined. Specifically, a new TDD configuration
30 dedicated to a downlink and/or a new TDD configuration dedicated to an uplink are defined. Examples of the new TDD configurations will be described below with

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reference to FIGS. 6 and 7. [0032]
FIG. 6 is an illustrative diagram for describing a TDD configuration dedicated to a downlink. Referring to FIG. 6, the TDD configuration dedicated to a 5 downlink is shown as Configuration 7. As illustrated in FIG. 6, all sub-frames in the TDD configuration dedicated to a downlink are sub-frames for a downlink (i.e., downlink sub-frames). [0033]
FIG. 7 is an illustrative diagram for describing TDD configurations
10 dedicated to uplinks. Referring to FIG. 7, the configurations dedicated to uplinks of Case 1 and Case 2 are shown as Configuration 8. Case 1 is a case in which the final sub-frame of the previous radio frame is an uplink sub-frame, and Case 2 is a case in which the final sub-frame of the previous radio frame is a downlink sub-frame. In both Case 1 and Case 2, the remaining sub-frames other than the first sub-frames (i.e.,
15 sub-frames #1 to #9) are uplink sub-frames. In addition, in Case 1, the first sub-frame (i.e., sub-frame #0) is also an uplink sub-frame. On the other hand, in Case 2, uplink transmission is not performed in a part or all of the first sub-frame. This is because reception of a downlink signal can be performed in the first sub-frame due to a propagation delay as in a special sub-frame.
20 [0034]
For example, sub-frames dedicated to downlinks and sub-frames dedicated to uplinks are prepared as described above. [0035]
By preparing such new TDD configurations as described above, more
25 desirable wireless communication can be performed through, for example, a receiver ofaWSD. [0036]
For example, by preparing the TDD configurations dedicated to downlinks, influence of a primary channel on a secondary channel can be further reduced even
30 when the primary channel that is used in wireless communication of a primary system and the secondary channel that is used in wireless communication of a

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secondary system are close to each other in the frequency direction. To be more specific, when the secondary channel is close to the primary channel in the frequency direction, the SINR of an uplink can be particularly lowered as described with reference to FIG. 5. For this reason, if a TDD configuration dedicated to a downlink 5 is prepared, the TDD configuration dedicated to a downlink can be set as a TDD configuration for wireless communication of the secondary channel. As a result, interference from the primary system can be further suppressed even when the secondary channel is adjacent to the primary channel. That is to say, even for an available channel adjacent to the primary channel, a decrease in an SINR can be
10 further suppressed. That is to say, desirable wireless communication can be performed through a receiver of a WSD (slave WSD). [0037]
In addition, for example, by preparing the TDD configuration dedicated to an uplink, the throughput of the uplink can be improved even when the bandwidth of
15 a secondary channel that is away from the primary channel in the frequency direction is narrow (or when the number of secondary channels is small). To be more specific, when the secondary channel is close to the primary channel in the frequency direction, the SINR of the uplink can be particularly lowered as described with reference to FIG. 5. In other words, if the secondary channel is away from the
20 primary channel in the frequency direction, the SINR of the uplink is not lowered very much either. For this reason, if the TDD configuration dedicated to an uplink is prepared, the TDD configuration dedicated to the uplink can be set as a TDD configuration for wireless communication of the secondary channel that is away from the primary channel. As a result, even when the bandwidth of the secondary
25 channel is narrow (or when the number of secondary channels is small), many radio resources to be used for the uplink can be secured. For this reason, the throughput of the uplink can be improved. That is to say, more desirable wireless communication can be performed tlirough a receiver of a WSD (master WSD). [0038]
30 Furthermore, for example, both the TDD configuration dedicated to a
downlink and the TDD configuration dedicated to an uplink can be prepared. In

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this case, even in a wireless communication system which employs TDD as a duplex
scheme, the same wireless communication as when FDD is employed as a duplex
scheme can be performed temporarily and/or on some frequency channels. For this
reason, for example, the TDD configuration dedicated to a downlink can be set for 5 wireless communication of the secondary channel that is closer to the primary
channel, and the TDD configuration dedicated to an uplink can be set for wireless
communication of the secondary channel that is away from the primary channel.
As a result, the throughput of the uplink can be improved while interference from the
primary channel is suppressed. 10 [0039]
«2. Schematic configuration of a communication system according to an
embodiment»
Next, a schematic configuration of a communication system according to an
embodiment of the present disclosure will be described with reference to FIG. 8. 15 FIG. 8 is an illustrative diagram illustrating an example of the schematic
configuration of the communication system 1 according to the present embodiment.
Referring to FIG. 1, the communication system 1 includes a geo-location database
(GLDB) 50, an advanced geo-location engine (AGLE) 100, a master white space
device (WSD) 200, and slave WSDs. It should be noted that this example is of a 20 communication system relating to TV white spaces.
[0040]
The GLDB 50 is a regulatory database for managing data of frequency
channels that a country operates. For example, the GLDB 50 provides and monitors
information and protection rules pertaining to a primary system. As an example, 25 the GLDB 50 provides information (hereinafter referred to as "available channel
related information) relating to a frequency channel that a secondary system can use
(hereinafter referred to as an "available channel").
[0041]
The AGLE 100 is a secondary system management node operated by a 30 frequency managing agent of a country or a third party. For example, the AGLE
100 may modify available channel related information provided by the GLDB 50

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using a more advanced protection algorithm, or add new information to the available
channel related information. One AGLE 100 is presented for the GLDB 50 in this
example; however, a plurality of AGLEs 100 can be presented for the GLDB 50.
[0042]
5 The master WSD 200 is a device which operates the secondary system
within the area of the country. Frequency channels that the master WSD 200 uses
in wireless communication, transmission power in the wireless communication, and
the like can be decided by the GLDB 50 and/or the AGLE 100.
[0043]
10 The slave WSDs 300 perform wireless communication with the master
WSD 200.
[0044]
It should be noted that the AGLE 100 and the master WSD 200 are
communication control devices which control wireless communication according to 15 the time division duplex (TDD) scheme. In addition, the wireless communication is,
for example, wireless communication of the secondary system that secondarily uses a
frequency channel for the primary system. For example, the AGLE 100 controls
wireless communication of the secondary system including each master WSD 200.
In addition, the master WSD 200 itself controls the wireless communication of the 20 secondary system.
[0045]
«3. Configuration of each device»
Next, examples of configurations of the AGLE 100, the master WSD 200,
and the slave WSDs 300 according to the present embodiment will be described with 25 reference to FIGS. 9 to 13.
[0046]
<3.1. Configuration of an AGLE>
An example of the configuration of the AGLE 100 according to the present
embodiment will be described with reference to FIGS. 9 to 11. FIG 9 is a block 30 diagram illustrating the example of the configuration of the AGLE 100 according to
the present embodiment. Referring to FIG. 9, the AGLE 100 has a network

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communication unit 110, a storage unit 120, and a control unit 130.
[0047]
(Network communication unit 110)
The network communication unit 110 communicates with other 5 communication nodes. For example, the network communication unit 110
communicates with the GLDB 50 and the master WSD 200.
[0048]
(Storage unit 120)
The storage unit 120 stores programs and data for operations of the AGLE 10 100.
[0049]
In addition, the storage unit 120 stores, for example, information relating to
an available channel for a secondary system (hereinafter referred to as "available
channel related information). The available channel related information includes, 15 for example, restrictions on available time, the center frequency, bandwidth,
maximum transmission power, transmission spectrum mask related information, link
direction, and the like of each available channel.
[0050]
In addition, the storage unit 120 stores, for example, various kinds of control 20 information to be provided to the GLDB 50 and the master WSD 200 and various
kinds of control information to be provided from the GLDB 50 and the master WSD
200 in addition to the available channel related information described above.
[0051]
(Control unit 130)
25 The control unit 130 provides various functions of the AGLE 100. The
control unit 130 includes an information acquisition unit 131, a channel recognition
unit 132, a selectable candidate decision unit 133, a channel allocation unit 135, a
configuration selection unit 137, and a configuration application unit 139.
[0052] 30 (Information acquisition unit 131)
The information acquisition unit 131 acquires information relating to

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available channels for a secondary system (i.e., available channel related
information).
[0053]
For example, the available channel related information includes available 5 time, center frequency, bandwidth, maximum transmission power, transmission
spectrum mask related information, and the like of each available channel. It
should be noted that the available channel information may be information provided
by the GLDB 50, or may be information modified by the AGLE 100 (control unit
130) from the information provided by the GLDB 50. 10 [0054]
In addition, for example, the information acquisition unit 131 acquires
various kinds of information provided from the GLDB 50 and the master WSD 200
via the network communication unit 110, and causes the storage unit 120 to store the
information. 15 [0055]
In addition, for example, the information acquisition unit 131 acquires
various kinds of control information to be provided to the GLDB 50 and the master
WSD 200 from the storage unit 120, and provides the various kinds of information to
the GLDB 50 and the master WSD 200 via the network communication unit 110. 20 [0056]
(Channel recognition unit 132)
The channel recognition unit 132 recognizes a frequency channel on which
wireless communication controlled by the AGLE 100 (hereinafter referred to as
"target wireless communication") is performed. 25 [0057]
For example, the channel recognition unit 132 recognizes an available
channel for a secondary system from acquired available channel information. A
specific example of this subject will be described below with reference to FIG. 10.
[0058]
30 FIG. 10 is an illustrative diagram for describing an example of available
channels for a secondary system. Referring to FIG. 10, a primary channel (i.e., a

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frequency channel used in wireless communication of a primary system) and three available channels #1 to #3 (i.e., frequency channels that the secondary system can use) are shown. The available channel #1 is the channel that is the closest to the primary channel among the available channels, and the available channel #3 is the 5 channel that is furthest from the primary channel among the available channels. For example, the channel recognition unit 132 recognizes the three available channels as above. [0059] (Selectable candidate decision unit 133)
10 For example, target wireless communication is performed on two or more
frequency channels. In this case, the selectable candidate decision unit 133 decides one or more candidates that are selectable to be applied to wireless communication of the individual frequency channels (hereinafter referred to as "selectable candidates") among a plurality of candidates for a TDD configuration for each frequency channel
15 included in the two or more frequency channels. In addition, the selectable candidate decision unit 133 decides one or more selectable candidates based on information of the distance between an interference frequency channel on which an interference signal is transmitted and each of the frequency channels in the frequency direction (hereinafter referred to as "distance related information"). For example,
20 the interference frequency channel is a frequency channel used in a different wireless communication system from the secondary system. As an example, the interference frequency channel is a frequency channel used in the primary system corresponding to the secondary system (or another primary system) (i.e., a primary channel). [0060]
25 For example, wireless communication of the secondary system (i.e., target
wireless communication) is performed on two or more available channels. In this case, the selectable candidate decision unit 133 decides one or more selectable candidates (TDD configurations) for each available channel included in the two or more available channels. In addition, the selectable candidate decision unit 133
30 decides one or more selectable candidates based on information relating to the distance between the primary channel and each of the available channels in the

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frequency direction (i.e., distance related information). That is to say, a restriction
on the link direction (TDD configuration) is decided for each available channel based
on the distance between an available channel and the primary channel.
[0061J
5 In addition, the plurality of candidates for a TDD configuration include a
TDD configuration dedicated to a downlink and/or a TDD configuration dedicated to an uplink. That is to say, the plurality of candidates for a TDD configuration include Configuration 7 and/or Configuration 8 as illustrated in FIGS. 6 and 7. In addition, the plurality of candidates include, for example, Configurations 0 to 6 as 10 illustrated in FIG. 1. [0062]
- Technique for deciding one or more selectable candidates
— First example
As a first example, when the distance between the interference frequency
15 channel and each of the frequency channels is shorter than a distance Di, the one or more selectable candidates include a TDD configuration dedicated to a downlink. That is to say, when the distance between the interference frequency channel and each of the frequency channels is shorter than a first distance, the selectable candidate decision unit 133 decides a TDD configuration dedicated to a downlink as
20 the selectable candidate. [0063J
For example, when the distance between the primary channel and each of the available channels is shorter than the distance Di, the selectable candidate decision unit 133 decides the TDD configuration dedicated to a downlink as the
25 selectable candidate. As an example, when there are the three available channels 1 to 3 illustrated in FIG. 10, the selectable candidate for the available channel I is the TDD configuration dedicated to a downlink. [0064]
Accordingly, for the available channel that is close to the primary channel
30 (interference frequency channel), the TDD configuration with only downlink sub-frames (TDD configuration with no uplink sub-frame) is selected and applied. As a

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result, on the available channel, only wireless communication of the downlink is performed, without performing wireless communication of an uplink. For this reason, interference in the available channel is suppressed. That is to say, a decrease in the SINR of the available channel is suppressed. 5 [0065]
— Second example
As a second example, when the distance between the interference frequency channel and each of the frequency channels is longer than a distance D2, the one or more selectable candidates include a TDD configuration dedicated to an uplink. 10 [0066]
For example, when the distance between the primary channel and each of the available channels is longer than the distance D2, the selectable candidate decision unit 133 decides the TDD configuration dedicated to an uplink as one selectable candidate. As an example, when there are the three available channels 1 15 to 3 as illustrated in FIG. 10, one or more selectable candidates for the available channel 3 includes the TDD configuration dedicated to an uplink. [0067]
Accordingly, for the available channel that is away from the primary channel (interference frequency channel), the TDD configuration only with uplink 20 sub-frames can be selected. For this reason, due to the selection of the TDD configuration, the throughput of the uplink in the secondary system can be improved even when the bandwidth of the available channel (or the sum of the bandwidths of all available channels) is narrow. [0068] 25 — Third example
As a third example, when the distance between the interference frequency channel and each of the frequency channels in the frequency direction is even longer, the one or more selectable candidates include a TDD configuration having a larger number of uplink sub-frames. 30 [0069]
For example, when the distance between the primary chamiel and each of

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the available channels in the frequency direction is even longer, the selectable candidate decision unit 133 decides a TDD configuration having a larger number of uplink sub-frames as a selectable candidate. As an example, when there are the three available channels 1 to 3 as illustrated in FIG. 10, the selectable candidate for 5 the available channel 3 includes Configuration 8 (i.e., the TDD configuration dedicated to the uplink). On the other hand, a selectable candidate for the available channel 1 and a selectable candidate for the available channel 2 do not include Configuration 8. In addition, for example, the selectable candidate for the available channel 2 includes Configurations 0 to 6. On the other hand, the selectable
10 candidate for the available channel 1 only includes Configuration 7 without including Configurations 0 to 6. In this manner, as the available channel is farther from the primary channel, the selectable candidates include a TDD configuration having a larger number of uplink sub-frames. [0070]
15 Accordingly, when an available channel is farther from the primary channel
(interference frequency channel), a TDD configuration having a larger number of uplink sub-frames can be selected for the available channel. On the other hand, when an available channel is closer to the primary channel (interference frequency channel), only a TDD configuration having a smaller number of uplink sub-frames
20 can be selected for the available channel. For this reason, due to the selection of the TDD configuration, interference in the available channels is suppressed. That is to say, a decrease of the S1NR of the available channels is suppressed. [0071]
The first to third examples of the technique for deciding one or more
25 selectable candidates have been described as above. Information of the selectable candidates decided as above is, for example, added to the available channel related information. That is to say, restrictions on the link direction are added to the available channel related information. An example of such available channel related information will be described with reference to FIG. 11.
30 [0072]
FIG. 11 is an illustrative diagram for describing the example of available

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channel related information to which information of selectable candidates is added. Referring to FIG 11, the available channel related information is shown in the form of a list. For example, the available channel related information includes available duration, center frequency, bandwidth, maximum transmission power, transmission 5 spectrum mask related information, and a restriction on the link direction of the available channels. The restriction on the link direction is the same as selectable candidates. For example, for an available channel with the center frequency of f 1, the restriction on the link direction is only an FDD uplink. That is to say, a selectable candidate for the available channel is only the TDD configuration
10 dedicated for the uplink. In addition, for an available channel with the center frequency of f2, all link directions are approved. That is to say, selectable candidates for the available channel are all TDD configurations. In addition, for an available channel with the center frequency of fn, the restriction on the link direction is only an FDD downlink. That is to say, a selectable candidate for the available
15 channel is only the TDD configuration dedicated to the downlink. In this manner, the available chaimel related information that includes selectable candidates is generated. [0073] - Decision based on QoS
20 In addition, the one or more selectable candidates may be decided based
further on information relating to quality of service (QoS) desired for target wireless communication (hereinafter referred to as "QoS related information")- That is to say, the selectable candidate decision unit 133 may decide the one or more selectable candidates based on distance related information and QoS related information.
25 [0074]
For example, the QoS related information includes throughput, latency, bandwidth, or the like. As an example, when high throughput is not demanded, the selectable candidate decision unit 133 may decide Configurations 0 to 6 as selectable candidates for an available channel that is close to the primary channel.
30 [0075]
Accordingly, TDD configurations can be selected with a restriction that is

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necessary and sufficient for wireless communication according to QoS desired for
the wireless communication. For this reason, frequency channels can be used more
flexibly.
[0076] 5 - Distance related information
It should be noted that, as an example, the distance related information (i.e.,
information relating to the distance between the primary channel and each of the
available channels in the frequency direction) is, for example, the distance between
the center frequency of the primary channel and the center frequency of each of the 10 available channels in the frequency direction. In this case, for example, the center
frequency of the primary channel is included in the control information provided
from the GLDB 50, and the center frequency of each of the available channels is
included in the available channel related information.
[0077]
15 As described above, selectable candidates for a TDD configuration are
decided for each of the frequency channels. Thereby, the throughput can be
improved while suppressing influence of interference.
[0078]
(Channel allocation unit 135)
20 The channel allocation unit 135 allocates a frequency channel to target
wireless communication.
[0079]
For example, the channel allocation unit 135 allocates one or more available
channels to wireless communication of the secondary system, 25 [0080]
- Allocation of a frequency channel that is away from the primary channel
In addition, the target wireless communication is performed on one or more
frequency channels. Then, the one or more frequency channels include a frequency
channel that is a distance D4 or farther from the interference frequency channel on 30 which an interference signal is transmitted in the frequency direction.
[0081]

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Specifically, for example, wireless communication of the secondary system
is performed on one or more available channels. Then, the one or more available
channels include an available chamiel that is the distance D4 or farther from the
primary channel in the frequency direction. That is to say, the channel allocation 5 unit 135 allocates an available channel that is the distance D4 or farther from the
primary channel in the frequency direction for the wireless communication of the
secondary system.
[0082]
With such allocation, interference from the primary channel can be reduced 10 more. For this reason, the throughput of the uplink in the secondary system can be
improved.
[0083]
- Allocation destination of a frequency channel
It should be noted that, when there are a plurality of master WSDs 200, the 15 channel allocation unit 135 may allocate the same available channel or allocate
different available channels to each of the master WSDs 200. As an example,
according to the position of each of the master WSDs 200, the channel allocation unit
135 may allocate available channels thereto, taking influence of the primary channel
on the positions into account. 20 [0084]
(Configuration selection unit 137)
The configuration selection unit 137 selects a TDD configuration for the
target wireless communication among the plurality of candidates for a TDD
configuration. 25 [0085]
For example, the configuration selection unit 137 selects a TDD
configuration for wireless communication (i.e., the target wireless communication)
of the secondary system among the plurality of candidates for a TDD configuration.
[0086]
30 For example, the plurality of candidates include at least one of the TDD
configuration dedicated to the downlink and the TDD configuration dedicated to the

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uplink. [0087]
In addition, for example, the plurality of candidates include the TDD configuration dedicated to the downlink. Accordingly, even for an available 5 channel adjacent to the primary channel, interference from the primary system can be further suppressed as described aboA'e. That is to say, even for an available channel adjacent to the primary channel, a decrease of the SINK can be further suppressed. [0088]
In addition, for example, the plurality of candidates include the TDD
10 configuration dedicated to the uplink. Accordingly, even when the bandwidth of the secondary channels that are away from the primary channel is narrow (or the number of secondary channels is small), many radio resources for the uplink can be secured as described above. For this reason, the throughput of the uplink can be improved.
15 [0089]
Then, for example, the plurality of candidates include both the TDD configuration dedicated to the downlink and the TDD configuration dedicated to the uplink as above. In this case, even in a wireless communication system which employs TDD as a duplex scheme, the same wireless communication as when FDD
20 is employed as a duplex scheme can be performed temporarily and/or on some frequency channels. As a result, the throughput of the uplink can be improved while suppressing interference from the primary channel. [0090]
In addition, for example, a link direction configuration dedicated to an
25 uplink includes a TDD configuration in which uplink transmission is not performed in a part or all of the first sub-frame among a plurality of sub-frames included in radio frames as described above. This subject is as described in Case 2 with reference to FIG. 7. Accordingly, even when the final sub-frame of the previous radio frame is a downlink sub-frame, interference in a downlink signal of the
30 downlink sub-frame can be avoided. [0091]

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— When the target wireless communication is performed on two or more frequency
channels
When the target wireless communication is performed on two or more frequency channels, the configuration selection unit 137 selects a TDD configuration 5 for the wireless communication of the individual frequency channels among the plurality of candidates for each of the frequency channels included in the two or more frequency channels. [0092]
For example, when the wireless communication of the secondary system is 10 performed on two or more available channels, the configuration selection unit 137 selects a TDD configuration for the individual available channels included in the two or more available channels. [0093]
— Technique of selecting a TDD configuration
15 — Selection from selectable candidates
For example, the configuration selection unit 137 selects a TDD configuration for the wireless communication of the individual frequency channels from one or more selectable candidates among the plurality of candidates. [0094]
20 For example, the configuration selection unit 137 selects a TDD
configuration from one or more selectable candidates decided by the selectable candidate decision unit 133 for each of available channels included in the two or more available channels. [0095]
25 --- Selection according to the distance from the primary chamiel
— First example
As a first example, the two or more frequency channels on which the target
wireless communication is performed include a first frequency channel that is closer
to the interference frequency channel on which an interference signal is transmitted
30 and a second frequency channel that is away from the interference frequency channel.
Then, the configuration selection unit 137 selects a first TDD configuration in which

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the number of downlink sub-frames is a first number as a TDD configuration for wireless communication of the first frequency channel. In addition, the configuration selection unit 137 selects a second link direction configuration in which the number of downlink sub-frames is a second number that is smaller than 5 the first number as a TDD configuration for wireless communication of the second frequency channel. [0096]
Specifically, for example, the two or more available channels on which the wireless communication of the secondary system is performed include a first
10 available channel that is close to the primary channel and a second available channel that is away from the primary channel. Then, the configuration selection unit 137 selects a first TDD configuration in which the number of downlink sub-frames is Ni as a TDD configuration for wireless communication of the first available channel. In addition, the configuration selection unit 137 selects a second TDD configuration
15 in which the number of downlink sub-frames is N2 (N2
Next, an example of a configuration of the master WSD 200 according to
the present embodiment will be described with reference to FIG. 12. FIG, 12 is a
block diagram illustrating the example of the configuration of the master WSD 200
according to the present embodiment. Referring to FIG. 12, the master WSD 200 10 has an antenna unit 210, a wireless communication unit 220, a network
communication unit 230, a storage unit 240, and a control unit 250.
[0116]
(Antenna unit 210)
The antenna unit 210 receives a radio signal, and outputs the received radio 15 signal to the wireless communication unit 220. In addition, the antenna unit 210
transmits a transmission signal output from the wireless communication unit 220.
[0117]
(Wireless communication unit 220)
The wireless communication unit 220 performs wireless communication 20 with the slave WSDs 300 when the slave WSDs 300 are positioned within the
communication range of the master WSD 200.
[0118]
(Network communication unit 230)
The network communication unit 230 communicates with other 25 communication nodes. For example, the network communication unit 230
communicates with the AGLE 100.
[0119]
(Storage unit 240)
The storage unit 240 stores programs and data for operations of the master 30 WSD 200,
[0120]

a

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In addition, for example, the storage unit 240 stores the available channel
related information, available channel allocation result, and TDD configuration
selection result.
[0121]
5 In addition, for example, the storage unit 240 stores various kinds of control
information provided from the AGLE 100 in addition to the above information. In
addition, the storage unit 240 stores various kinds of control information to be
provided to the AGLE 100.
[0122] 10 (Control unit 250)
The control unit 250 provides various functions to the master WSD 200.
The control unit 250 includes an information acquisition unit 251, a configuration
selection unit 253, a configuration application unit 255, and a communication control
unit 257. 15 [0123]
(Information acquisition unit 251)
The information acquisition unit 251 acquires information necessary for the
target wireless communication.
[0124]
20 For example, the information acquisition unit 251 acquires the available
channel related information, available channel allocation result, and TDD
configuration selection result from the AGLE 100 via the network communication
unit 230. In addition, the information acquisition unit 251 causes the storage unit
240 to store the information. 25 [0125]
In addition, for example, the information acquisition unit 251 acquires
various other kinds of information provided from the AGLE 100 via the network
communication unit 230, and causes the storage unit 240 to store the information.
[0126]
30 In addition, for example, the information acquisition unit 251 acquires
various kinds of control information to be provided to the AGLE 100 from the

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storage unit 240, and provides the various kinds of information to the AGLE 100 via
the network communication unit 230.
[0127]
(Configuration selection unit 253)
5 The configuration selection unit 253 selects a TDD configuration for the
target wireless communication among a plurality of candidates for a TDD
configuration.
[0128]
For example, the configuration selection unit 253 selects a TDD 10 configuration for the wireless communication of the secondary system (i.e., target
wireless communication) among the plurality of candidates for the TDD
configuration.
[0129]
In addition, for example, when the target wireless communication is 15 performed on two or more frequency channels, the configuration selection unit 253
selects a TDD configuration for the wireless communication of each of the frequency
channels among the plurality of candidates for each of the frequency channels
included in the two or more frequency channels.
[0130]
20 For example, when the wireless communication of the secondary system is
performed on two or more available channels, the configuration selection unit 253
selects a TDD configuration for each of the available channels included in the two or
more available channels.
[0131] 25 - Specific selection technique
For example, the configuration selection unit 253 selects a TDD
configuration based on the result of selection of the TDD configuration provided
from the AGLE 100.
[0132] 30 (Configuration application unit 255)
The configuration application unit 255 applies the selected TDD

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configuration to the target wireless communication.
[0133]
Specifically, for example, the configuration application unit 255 applies the
selected TDD configuration to the wireless communication of the secondary system. 5 [0134]
-When the target wireless communication is performed on two or more frequency
channels
For example, the target wireless communication is performed on two or
more frequency channels. In this case, the configuration application unit 255 10 applies a TDD configuration selected for each of the frequency channels included in
the two or more frequency channels to th& wireless communication of each of the
frequency channels.
[0135]
Specifically, for example, the wireless communication of the secondary 15 system is performed on two or more available channels. In this case, the
configuration application unit 255 applies the TDD configuration selected for each of
the available channels included in the two or more available channels to the wireless
communication of each of the available channels.
[0136] 20 - Specific application technique
For example, the configuration application unit 255 applies the selected
TDD configuration to the target wireless communication (for example, the wireless
communication of the secondary system) by setting the selected TDD configuration
in the master WSD 200. In addition, the configuration application unit 255 notifies 25 the slave WSDs 300 of the set TDD configuration via the wireless communication
unit 220.
[0137]
(Communication control unit 257)
The communication control unit 257 controls wireless communication in 30 compliance with the time division duplex (TDD) scheme. For example, the
wireless communication is wireless communication of the secondary system which

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secondarily uses a frequency channel for the primary system.
[0138]
Specifically, for example, the communication control unit 257 controls the
wireless communication of the secondary system based on the TDD scheme 5 according to the set TDD configuration. That is to say, the communication control
unit 257 causes the wireless communication unit 220 to transmit a downlink signal
using downlink sub-frames and to receive an uplink signal using uplink sub-frames.
[0139]
<3.3. Configuration of a slave WSD>
10 Next, an example of a configuration of the slave WSD 300 according to the
present embodiment will be described with reference to FIG. 13. FIG. 13 is a block
diagram illustrating the example of the configuration of the slave WSD 300
according to the present embodiment. Referring to FIG. 13, the slave WSD 300 has
an antenna unit 310, a wireless communication unit 320, a storage unit 330, and a 15 control unit 340.
[0140]
(Antenna unit 310)
The antenna unit 310 receives a radio signal, and outputs the received radio
signal to the wireless communication unit 320. In addition, the antenna unit 310 20 transmits a transmission signal output by the wireless communication unit 320.
[0141]
(Wireless communication unit 320)
The wireless communication unit 320 performs wireless communication
with the master WSD 200 when the slave WSD 300 is positioned within the 25 communication range of the master WSD 200.
[0142]
(Storage unit 330)
The storage unit 330 stores programs and data for operations of the slave
WSD 300. 30 [0143]
In addition, for example, the storage unit 330 stores a TDD configuration set

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by the master WSD 200. [0144]
In addition, for example, the storage unit 330 stores information provided from the master WSD 200 in addition to the above-mentioned information. In 5 addition, the storage unit 330 stores various kinds of control information to be provided to the master WSD 200. [0145] (Control unit 340)
The control unit 340 provides various functions of the slave WSD 300. 10 The control unit 340 includes an information acquisition unit 341, a configuration recognition unit 343, and a communication control unit 345. [0146] (Information acquisition unit 341)
The information acquisition unit 341 acquires information necessary for the 15 target wireless communication. [0147]
For example, the information acquisition unit 341 acquires the set TDD configuration from the master WSD 200 via the wireless communication unit 320. Then, the information acquisition unit 34 causes the storage unit 330 to store the set 20 TDD configuration. [0148]
In addition, for example, the information acquisition unit 341 acquires various other kinds of information provided from the master WSD 200 via the wireless communication unit 320, and causes the storage unit 330 to store the 25 information. [0149]
In addition, for example, the information acquisition unit 341 acquires various kinds of control information to be provided to the master WSD 200 from the storage unit 330, and provides the various kinds of information to the master WSD 30 200 via the wireless communication unit 320. [0150]

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(Configuration recognition unit 343)
The configuration recognition unit 343 recognizes a TDD configuration to be applied to the target wireless communication among a plurality of candidates for the TDD configuration. 5 [0151]
For example, the information acquisition unit 341 acquires the set TDD configuration from the master WSD 200 as described above. Then, the configuration recognition unit 343 recognizes the set TDD configuration. [0152] 10 (Communication control unit 345)
The communication control unit 345 controls wireless communication in compliance with the time division duplex (TDD) scheme. For example, the wireless communication is wireless communication of the secondary system which secondarily uses a frequency channel for the primary system. 15 [0153]
Specifically, for example, the communication control unit 345 controls the wireless communication of the secondary system based on the TDD scheme according to the set TDD configuration. That is to say, the communication control unit 345 causes the wireless communication unit 320 to transmit a downlink signal 20 using downlink sub-frames and to receive an uplink signal using uplink sub-frames. [0154] «4. Flow of a process»
Next, an example of a communication control process according to the present embodiment will be described with reference to FIG. 14. FIG. 14 is a 25 sequence diagram illustrating the example of the schematic flow of the communication control process according to the present embodiment. [0155]
First, the GLDB 50 and the AGLE 100 exchange information in a cyclic
manner or according to a predetermined trigger (Step S40I). The exchanged
30 information herein includes for example, synchronization information (NTP
information, Global Positioning System (GPS), IEEE 1588 (a protocol for causing

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clocks of base stations distributed on a network to synchronize with each other), time correction information, and the like), ID information, managed area information (country, region, latitude, longitude, altitude, and the like), security information (security keys for mutual authentication and the like), information updating cycle 5 information, backup related information, and primary system transmitter information (height of an antenna, position (latitude and longitude), transmission spectrum mask information, use frequency related information (center frequency and bandwidth), gain of an antenna, directivity of an antenna, and the like). [0156]
10 In addition, the AGLE 100 and the master WSD 200 exchange information
in a cyclic manner or according to a predetermined trigger (Step S403). The exchanged information herein includes, for example, synchronization information, ID information, managed area information, security information, information updating cycle information, backup related information, and transmitter and receiver
15 information of the master WSD 200 and the slave WSD 300 (height of an antenna, position (latitude and longitude), transmission spectrum mask information, use frequency related information (center frequency and bandwidth), gain of an antenna, directivity of an antenna, and the like). [0157]
20 In addition, the AGLE 100 decides information relating to an available
channel for the secondary system (i.e., available channel related information) (Step S405). The available channel related information includes available time, center frequency, bandwidth, maximum transmission power, and transmission spectrum mask related information of each available channel. In addition, the AGLE 100
25 (selectable candidate decision unit 133) decides one or more selectable candidates (TDD configurations) among a plurality of candidates for a TDD configuration for each of available channels. The one or more selectable candidates are decided based on information relating to the distance between the primary channel and each of the available channels in the frequency direction (i.e., distance related
30 information). Then, the information of the one or more selectable candidates decided as described above is added to the available channel related information.

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[0158]
Then, the AGLE 100 (channel allocation unit 135) allocates the one or more
available channels to wireless communication of the secondary system (Step S407).
[0159]
5 In addition, the AGLE 100 (configuration selection unit 137) selects a TDD
configuration for wireless communication of the individual available channels among the plurality of candidates for the TDD configuration for each of the allocated available channels (Step S409). Specifically, the AGLE 100 selects a TDD configuration for wireless communication of the individual available channels from 10 one or more selectable candidates (TDD configurations) for each of the allocated available channels. [0160]
Then, AGLE 100 (configuration application unit 139) notifies the master WSD 200 of the TDD configuration selection result (Step S411). In addition, the 15 AGLE 100 also notifies the master WSD 200 of the available channel related information and the available channel allocation result. [0161]
After that, the master WDS 200 (configuration application unit 255) sets the TDD configuration selected for each of the available channels in the master WSD 20 200(S413). [0162]
Then, the master WSD 200 (communication control unit 257) starts wireless communication of the secondary system based on the TDD scheme in compliance with the set TDD configuration. 25 [0163]
«5. Modified examples»
Next, first to fourth modified examples of the present embodiment will be described. [0164] 30 <5.1. First modified example>
In the examples of the present embodiment described above, the AGLE 100

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performs decision of selectable candidates, allocation of available channels, and selection of a TDD configuration. On the other hand, in the first modified example, the GLDB 50 performs decision of selectable candidates, allocation of available channels, and selection of a TDD configuration. That is to say, in the first modified 5 example, the functions of the selectable candidate decision unit 133, the channel allocation unit 135, and the configuration selection unit 137 of the AGLE 100 are provided in the GLDB 50 instead of the AGLE 100. An example of the communication control process according to the first modified example will be described below with reference to FIG. 15.
10 [0165J
FIG. 15 is a sequence diagram illustrating an example of the schematic flow of a communication control process according to the first modified example of the embodiment. It should be noted that Steps S501, S503, S513, S515, and S517 are the same as Steps S401, S403, S411, S413, and S415 of the communication control
15 process described with reference to FIG. 14. Thus, only Steps S505, S507, S509, and S511 will be described here. [0166]
The GLDB 50 decides information relating to available channels for the secondary system (i.e., available channel related information) (Step S505). The
20 available channel related information includes available time, center frequency, bandwidth, maximum transmission power, and transmission spectrum mask related information of each of the available channels. In addition, the GLDB 50 decides one or more selectable candidates (TDD configurations) among a plurality of candidates for a TDD configuration for each of the available channels. The one or
25 more selectable candidates are decided based on information relating to the distance between the primary channel and each of the available channels in the frequency direction (i.e., distance related information). Then, the information of the one or more selectable candidates decided in this manner is added to the available channel related information.
30 [0167]
Then, the GLDB 50 allocates the one or more available channels to wireless

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communication of the secondary system (Step S507).
[0168]
In addition, the GLDB 50 selects a TDD configuration for the wireless
communication of the individual available channels among the plurality of 5 candidates for the TDD configuration for each of the allocated available channels
(Step S509).
[0169]
Then, the GLDB 50 notifies the AGLE 100 of the TDD configuration
selection result (Step S511). In addition, the GLDB 50 also notifies the AGLE 100 10 of the available channel related information and the available channel allocation
result.
[0170]
As described above, according to the first modified example, the decision of
selectable candidates, allocation of available channels, and selection of a TDD 15 configuration are performed by the GLDB 50. It should be noted that some of the
decision of selectable candidates, allocation of available channels, and selection of a
TDD configuration may be performed by the GLDB 50 and the rest may be
performed by the AGLE 100.
[0171] 20 <5.2. Second modified example>
In the example of the embodiment described above, the AGLE 100 perforins
selection of a TDD configuration. On the other hand, in the second modified
example of the embodiment, the macro WSD 200 performs selection of a TDD
configuration. That is to say, in the second modified example, among the functions 25 of the AGLE 100, the function of the configuration selection unit 137 is provided in
the master WSD 200 instead of the AGLE 100. An example of a communication
control process according to the second modified example will be described below
with reference to FIG. 16.
[0172]
30 FIG. 16 is a sequence diagram illustrating an example of the schematic flow
of the communication control process according to the second modified example of

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the embodiment. It should be noted that Steps S601 to S607, S6I3, and S615 are
the same as Steps S401 to S407, S413, and S415 of the communication control
process described with reference to FIG. 14. Thus, only Steps S609 and S611 will
be described herein. 5 [0173]
The AGLE 100 notifies the master WSD 200 of the available channel
related information and the available channel allocation result (Step S609).
[0174]
After that, the master WSD 200 selects a TDD configuration for wireless 10 communication of the individual available channels among the plurality of
candidates for the TDD configuration for each of the allocated available channels
(StepS611).
[0175]
As described above, according to the second modified example, the 15 selection of a TDD configuration is performed by the macro WSD 200. It should be
noted that, in such a case, decision of selectable candidates and/or allocation of
available channels may be further performed by the GLDB 50.
[0176]
<5.3. Third modified example>
20 In the examples of the embodiment described above, the techniques for
suppressing or avoiding interference of the primary system in the secondary system
under management of one GLDB 50 that corresponds to one country have been
described. However, when the secondary system (for example, the master WSD
200) is positioned near a boundary between countries, there is a possibility of the 25 secondary system being affected by primary systems of the different countries.
That is to say, there is a possibility of a primary system of a certain country
interfering with a secondary system of another country.
[0177]
Thus, in the third modified example of the present embodiment, not only a 30 primary system under management of one GLDB 50 that corresponds to one country
but also a primary system under management of a GLDB 50 that corresponds to

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another country is taken into account. That is to say, a technique for suppressing or avoiding interference from the primary system under management of the GLDB 50 that corresponds to the other country in a secondary system is provided. [0178] 5 - Example of disposition of each device according to the third modified example
First, an example of disposition of each device that is a premise of a third embodiment will be described with reference to FIG. 17. FIG. 17 is an illustrative diagram for describing the example of disposition of each device that is the premise of the third embodiment. Referring to FIG. 17, a boundary 60 between a country A
10 and a country B is shown. The boundary 60 may not necessarily coincide with a border, and may be flexibly set from the perspective of management of frequency bands. In addition, the third modified example can be widely applied to control of secondary use not only at a boundary between countries but also at a boundary between other types of regions that can include communities, states, prefectures, or
15 the like. [0179]
A GLDB 50A is a regulatory database that manages data of frequency channels managed by the country A. In addition, an AGLE 100A is a secondary system management node operated by a frequency managing agent or a third party in
20 the country A. On the other hand, a GLDB 50B is a regulatory database that manages data of frequency channels managed by the country B. In addition, an AGLE 50B is a secondary system management node operated by a frequency managing agent or a third party in the country B. [0180]
25 A master WSD 200A is a device that operates a secondary system near the
boundary 60 in a region of the country A. A master WSD 200B is a device that operates a secondary system near the boundary 60 in a region of the country B. There is a possibility of the master WSD 200A of the country A being influenced not only by a primary system of the country A but also by a primary system of the
30 country B. In addition, similarly, there is a possibility of the master WSD 200B of the country B being influenced not only by the primary system of the country B but

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also by the primary system of the country A.
[0181]
For this reason, in the third embodiment, as a control entity for suppressing
or avoiding such influence, a Coordinated Resource Management (CRM) is provided. 5 The CRM verifies whether a primary system of a country influences a secondary
system of another country, and performs adjustment relating to available channels
when necessary. In the example illustrated in FIG. 17, the CRM is installed as a
part of each AGLE 100.
[0182] 10 - Flow of a process
Next, an example of a communication control process according to the third
modified example of the embodiment will be described with reference to FIGS. 18A
and 18B. FIGS. 18A and 18B are sequence diagrams illustrating an example of the
schematic flow of the communication control process according to the third modified 15 example of the embodiment.
[0183]
First, the GLDB 50A and the AGLE 100A exchange information in a cyclic
maimer or according to a predetermined trigger (Step S701). Similarly, the GLDB
50B and the AGLE 100B also exchange information in a cyclic maimer or according 20 to a predetermined trigger. The exchanged information here is as described relating
to Step S401 shown in FIG. 14.
[0184]
In addition, the AGLE 100A and the master WSD 200A exchange
information in a cyclic maimer or according to a predetermined trigger (Step S703). 25 Similarly, the AGLE 100B and the master WSD 200B also exchange information in a
cyclic manner or according to a predetermined trigger. The exchanged information
here is as described relating to Step S403 shown in FIG. 14.
[0185]
In addition, the AGLE 100A decides information relating to available 30 channels (i.e., available channel related information) for the secondary system in the
country A (Step S705). Similarly, the AGLE 100B also decides information relating

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to available channels (i.e., available channel related information) for the secondary
system in the country B. The decided available channel related information
includes information of one or more selectable candidates (TDD configurations).
[0186]
5 Particularly, in the third modified example, the AGLE 100A and the AGLE
100B exchange information (Step S707). The exchanged information here includes part or all of the information exchanged in Steps S701 and S703. [0187]
Then, each of the AGLE 100 A and the AGLE 100B checks whether there is
10 a primary system that is a primary system of another country whose presence is not known and has influence on the secondary system of its own country. Then, when there is such a primary system, the AGLE 100 estimates influence from the primary system on the secondary system (for example, a level of interference). When the influence is equal to or greater than a predetermined level, the AGLE 100 modifies
15 the available channel information, and makes a decision again (Step S709). The fixing of the available channel information may be, for example, a change of selectable candidates for a TDD configuration, a reduction in the bandwidth of the available channels that receive the influence, or deletion of the available channels. [0188]
20 After that, the AGLE 100A and the AGLE 100B exchange information
again (Step S711). The exchanged information here includes, for example, the re-decided available channel related information. Then, the AGLE 100A and the AGLE 100B each confirm the re-decision of the available channel related information and reach an agreement.
25 [0189]
Then, in Step S721 to Step S729, the same processes as Steps S407 to S415 described with reference to FIG. 14 are performed. [0190]
It should be noted that the process of Step S713 may be performed by only
30 one of the AGLE 100 A and the AGLE 100B rather than both. In this case, which of the AGLE 100A and the AGLE 100B will perform the process may be decided based

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on a load of the process on each of the devices, or may be randomly decided. In
addition, the process may be performed alternately by the AGLE 100A and the
AGLE 100B.
[0191]
5 In addition, a frequency channel that is dedicated to avoiding the problem of
interference near the boundary 60 may be secured. In this case, when influence of the primary system on the secondary system reaches a predetermined level or higher in Step S713, use of the dedicated frequency channel may be permitted. [0192]
10 - Example of disposition of other CRMs
In the example described above, the CRM is disposed in the AGLEs 100. However, disposition of the CRM according to the third embodiment is not limited to the example. A specific example of this subject will be described below with reference to FIGS. 19 and 20.
15 [0193]
FIG. 19 is an illustrative diagram for describing another example of disposition of a CRM. Referring to FIG. 19, the GLDB 50A and AGLE 100A, and the GLDB 50B and AGLE 100B are as illustrated in FIG. 17. A CRM 300 is installed as a physically independent device from the GLDBs 50 and AGLEs 100 as
20 illustrated in FIG. 19, and it may be communicably connected to the GLDBs 50 and AGLEs 100. [0194]
This CRM 300, for example, exchanges information with the AGLE 100A and AGLE 100B (and the GLDB 50A and GLDB 50B), and checks whether there is
25 a primary system of another country that has influence on a secondary system of one country. Then, when there is such a primary system, the CRM 300 estimates the influence of the primary system on the secondary system (for example, a level of interference). When the influence is equal to or greater than a predetermined level, the CRM 300 modifies the available channel information and makes a decision again.
30 [0195]
FIG. 20 is an illustrative diagram for describing still another example of

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disposition of CRMs. Referring to FIG. 20, the GLDB 50A and AGLE 100A, and
the GLDB 50B and AGLE 100B are as illustrated in FIG. 17. As illustrated in FIG.
20, the CRMs may be installed as a part of each GLDB 50.
[0196]
5 The GLDB 50 that includes such a CRM in a part thereof checks, for
example, whether there is a primary system of another country that has influence on
a secondary system of one country. Then, when there is such a primary system, the
GLDB 50 estimates the influence of the primary system on the secondaiy system (for
example, a level of interference). When the influence is equal to or greater than a 10 predetermined level, the GLDB 50 modifies the available chamiel information and
makes a decision again.
[0197]
The third modified example of the embodiment has been described above.
According to the third modified example of the embodiment, not only interference of 15 a primary system of a country but also interference of a primary system of another
country is suppressed or avoided.
[0198]
<5.4. Fourth modified example>
The embodiments have mainly been described in the context of TV white 20 spaces so far. However, the technology according to the embodiments is not limited
thereto.
[0199]
For example, in review of a fifth generation (5G) wireless communication
scheme since 3GPP Release 12, overlapping a macro cell and a small cell has been 25 proposed in order to improve communication capacities (NTT DOCOMO, INC.,
"Requirements, Candidate Solutions & Technology Roadmap for LTE Rel-12
Onward," 3GPP Workshop on Release 12 and onwards, Ljubljana, Slovenia, June
11th to 12th, 2012). The technology of the embodiments can also be applied to a
case in which interference between a macro cell and a small cell can occur. That is 30 to say, the target wireless communication may be wireless communication of a small
cell that is partly or entirely overlapped by a macro cell, and an interference

frequency channel may be a frequency channel used in the macro cell. [0200]
In addition, the technology according to the embodiments can also be applied to a case of LSA that is based on (he premise of infrastructure sharing. In addition, the technology according to the embodiments can also be applied to a cell case in which interference between a system operated by a mobile virtual network operator (MVNO) and/or a mobile virtual network enabler (MVNE) and a system operated by a mobile network operator (MNO) can occur. In addition, the technology according to the embodiments can also be applied to a case to which Multimedia Broadcast Multicast Service (MBMS) is applied. Specifically, for example, when the same signal is transmitted from a plurality of base stations at once in a synchronized manner using an MBMS single frequency network (MBSFN) transmission scheme, a TDD configuration dedicated to a downlink may be applied to wireless communication of (a plurality of) frequency channels. In this case, a process relating to allocation of uplink channels may be omitted. [0201]
It should be noted that which system or cell is to be set as an interfering side and which system or cell is to be set to receive interference may be decided according to the priority of each communication link. The priority can be specified based on a QoS requirement or defined in advance. [0202] «6. Application Examples»
The technology of the present disclosure is applicable to various products. For example, each of the AGLE 100 and the GLDB 50 may be realized as any type of server such as a tower server, a rack server, and a blade server. Each of the AGLE 100 and the GLDB 50 may be 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. [0203]
For example, the master WSD 200 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 master WSD 200 may be realized as any other types of base stations such as a NodeB and a base transceiver station (BTS). The master WSD 200 may include a main body (that is also referred to as a base station apparatus) configured to control wireless communication, and one or more remote radio heads (RRH) disposed in a different place from the main body. Additionally, various types of terminals to be described below may also operate as the master WSD 200 by temporarily or semi-permanently executing a base station function. [0204]
For example, the slave WSD 300 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 slave WSD 300 may also be realized as a terminal that performs machine-to-machine (M2M) communication (that is also referred to as a machine type communication (MTC) terminal). Furthermore, the slave WSD 300 may be a wireless communication module (such as an integrated circuit module configured with a single die) mounted on each of the terminals. [0205] <6.1. Application example of an AGLE and a GLDB->
FIG 21 is a block diagram illustrating an example of a schematic configuration of a server 750 to which the technology of the present disclosure may be applied. The server 750 includes a processor 751, a memory 752, a storage 753, a network interface 754, and a bus 756.

CLAIMS
Claim 1
A communication control device that controls wireless communication in compliance with a time division duplex (TDD) scheme, the communication control device comprising:
a selection unit configured to select a link direction configuration for the wireless conimumcation among a plurality of candidates for the link direction configuration which indicates a link direction in units of sub-frames of a radio frame which includes a plurality of sub-frames; and
an application unit configured to apply the selected link direction configuration to the wireless communication,
wherein the plurality of candidates include at least one of a link direction configuration dedicated to a downlink and a link direction configuration dedicated to an uplink.
Claim 2
The communication control device according to claim 1, wherein the plurality of candidates include the link direction configuration dedicated to a downlink.
Claim 3
The communication control device according to claim 1, wherein the plurality of candidates include the link direction configuration dedicated to an uplink.
Claim 4
The communication control device according to claim 3, wherein the link direction configuration dedicated to an uplink includes a link direction configuration in which uplink transmission is not performed in a part or all of a first sub-frame among the plurality of sub-frames.
Claim 5

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The communication control device according to claim 1,
wherein, when the wireless communication is performed on two or more
frequency chaimels, the selection unit selects a link direction configuration for
wireless communication of each of the frequency chaimels from the plurality of
5 candidates for each of the frequency chaimels that are included in the two or more
frequency chaimels, and
wherein the application unit applies the link direction configuration selected for each of the frequency chaimels to wireless communication of each of the frequency channels. 10
Claim 6
The communication control device according to claim 5,
wherein the selection unit selects the link direction configuration for the wireless communication of each of the frequency chaimels from one or more 15 selectable candidates among the plurality of candidates, and
wherein the one or more selectable candidates are decided based on information relating to the distance between an interference frequency channel on which an interference signal is transmitted and each of the frequency chaimels in a frequency direction. 20
Claim 7
The communication control device according to claim 6, wherein the one or more selectable candidates are decided based further on information relating to service quality desired for the wireless communication. 25
Claim 8
The communication control device according to claim 6, wherein, when the distance between the interference frequency channel and each of the frequency channels is shorter than a first distance, the one or more selectable candidates are the 30 link direction configuration dedicated to a downlink.

Claim 9
The communication control device according to claim 6, wherein, when the distance between the interference frequency channel and each of the frequency channels is longer than a second distance, the one or more selectable candidates include the link direction configuration dedicated to an uplink.
Claim 10
The communication control device according to claim 6, wherein, when the distance between the interference frequency channel and each of the frequency channels is even longer, the one or more selectable candidates include a link direction configuration having the larger number of uplink sub-frames.
Claim 11
The communication control device according to claim 5, wherein the two or more frequency channels include a first frequency channel that is closer to an interference frequency channel on which an interference signal is transmitted and a second frequency channel that is farther from the interference frequency channel, and
wherein the selection unit selects a first link direction configuration of which the number of downlink sub-frames is a first number as a link direction configuration for wireless communication of the first frequency channel, and selects a second link direction configuration of which the number of downlink sub-frames is a second number that is smaller than the first number as a fink direction configuration for wireless communication of the second frequency channel.
Claim 12
The communication control device according to claim 5, wherein, when the distance between an interference frequency channel on which an interference signal is transmitted and each of the frequency channels in a frequency direction is shorter than a third distance, the selection unit selects the link direction configuration dedicated to a downlink as a link direction configuration for wireless communication

of each of the frequency channels.
Claim 13
The communication control device according to claim 1,
wherein the wireless communication is performed on one or more frequency
channels, and
wherein the one or more frequency channels include a frequency channel
that is a fourth distance or more apart from an interference frequency channel on
which an interference signal is transmitted in a frequency direction.
Claim 14
The communication control device according to claim 13, wherein, when the wireless communication is a predetermined type of wireless communication, the selection unit selects a link direction configuration of which the number of uplink sub-frames is greater than a predetermined number as a link direction configuration for the frequency channel that is the fourth distance or more apart from the interference frequency channel.
Claim 15
The communication control device according to claim 14, wherein the predetermined type of wireless communication is machine-to-machine communication.
Claim 16
The communication control device according to claim 6,
wherein the wireless communication is wireless communication of a
secondary system that secondarily uses a frequency channel for a primary system,
and
wherein the interference frequency channel is a frequency channel that is
used in another wireless communication system different from the secondary system.

Claim 17
The communication control device according to claim 6,
wherein the wireless communication is wireless communication of a small
cell which is partly or entirely overlapped by a macro cell, and
wherein the interference frequency channel is a frequency channel that is
used in the macro cell.
Claim 18
A communication control method for controlling wireless communication in compliance with a time division duplex (TDD) scheme, the communication control method comprising:
selecting a link direction configuration for the wireless communication among a plurality of candidates for the link direction configuration which indicates a link direction in units of sub-frames of a radio frame which includes a plurality of sub-frames; and
applying the selected link direction configuration to the wireless communication,
wherein the plurality of candidates include at least one of a link direction configuration dedicated to a downlink and a link direction configuration dedicated to an uplink.
Claim 19
A communication control device comprising:
a recognition unit configured to recognize a frequency channel on which wireless communication is performed in compliance with a time division duplex (TDD) scheme; and
a decision unit configured to, when the wireless communication is performed on two or more frequency channels, decide one or more candidates selectable to be applied to wireless communication of each of the frequency channels among a plurality of candidates for a link direction configuration that indicates a link direction in units of sub-frames of a radio frame that includes a plurality of sub-

frames for each' of the frequency channels included in the two or more frequency channels, on the basis of information relating to the distance between an interference frequency channel 'on which an interference signal is transmitted and each of the frequency channels in a frequency direction,
, wherein the plurality of candidates include at least one of a link direction configuration dedicated to a downlink and a link direction configuration dedicated to an uplink.
Claim 20
A communication device that controls wireless communication in
compliance with a time division duplex (TDD) scheme, the communication device
comprising: . ■ .
a recognition unit configured to recognize a link direction configuration to be applied to the wireless communication among a plurality of candidates for the link direction configuration that indicates a link direction in units of sub-frames of a radio frame that.includes a plurality of sub-frames; and
a communication control unit configured to control the wireless communication in compliance with the recognized link direction configuration,
wherein the plurality of candidates include at least one of a link direction configuration dedicated to a downlink and a link direction configuration dedicated to an-uplink.