NZ755723B2 - Communication control system, communication control method, program, and relay apparatus - Google Patents
Communication control system, communication control method, program, and relay apparatus Download PDFInfo
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- NZ755723B2 NZ755723B2 NZ755723A NZ75572317A NZ755723B2 NZ 755723 B2 NZ755723 B2 NZ 755723B2 NZ 755723 A NZ755723 A NZ 755723A NZ 75572317 A NZ75572317 A NZ 75572317A NZ 755723 B2 NZ755723 B2 NZ 755723B2
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- traffic volume
- communication traffic
- relay apparatus
- base station
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-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0252—Traffic management, e.g. flow control or congestion control per individual bearer or channel
- H04W28/0257—Traffic management, e.g. flow control or congestion control per individual bearer or channel the individual bearer or channel having a maximum bit rate or a bit rate guarantee
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0289—Congestion control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
-
- H04W28/085—
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
- H04W48/06—Access restriction performed under specific conditions based on traffic conditions
-
- H04W72/085—
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
Abstract
The purpose of the present invention is to ensure the communication quality of a terminal device directly connecting with a macrocell base station, and ensure the communication quality of a terminal device connecting with the macrocell base station via a relay device. This communication control system is provided with: an acquisition unit that acquires communication situation information including past communication volumes between a macrocell base station and a relay device 20; a setting unit that, on the basis of the communication situation information, presets a first communication permission volume in a first communication period during which the communication volume between the macrocell base station and the relay device 20 is larger than or equal to a predetermined communication volume, and a second communication permission volume in a second communication period during which the communication volume is smaller than the predetermined communication volume; a measurement unit that measures a current communication volume between the macrocell base station and the relay device 20; and a control unit that controls the second communication permission volume on the basis of the measured current communication volume. em is provided with: an acquisition unit that acquires communication situation information including past communication volumes between a macrocell base station and a relay device 20; a setting unit that, on the basis of the communication situation information, presets a first communication permission volume in a first communication period during which the communication volume between the macrocell base station and the relay device 20 is larger than or equal to a predetermined communication volume, and a second communication permission volume in a second communication period during which the communication volume is smaller than the predetermined communication volume; a measurement unit that measures a current communication volume between the macrocell base station and the relay device 20; and a control unit that controls the second communication permission volume on the basis of the measured current communication volume.
Description
James & Wells Ref: 312129NZ
DESCRIPTION
TITLE OF THE INVENTION:
COMMUNICATION CONTROL SYSTEM, COMMUNICATION CONTROL
METHOD, PROGRAM, AND RELAY APPARATUS
TECHNICAL FIELD
The present invention relates to a communication control system, a communication
control method, a program, and a relay apparatus that control communication for a
relay apparatus capable of relaying communication between a terminal device(s)
and a macro cell base station.
BACKGROUND ART
The LTE (Long Term Evolution) has become widespread as a common
specification for radio communication systems in place of third-generation mobile
communications systems (3G: 3rd Generation). The LTE is a telecommunications
specification that supports only packet communications, and voices are converted
into packets according to VoIP (Voice over Internet Protocol) and the converted
packets are then transmitted and received. Particularly, the VoIP of the LTE
specification is called VoLTE (Voice over LTE).
Regarding a mobile communications system, a home base station is installed and
made to relay communication between a terminal device and a core network in
order to secure communication quality within a building. Conventionally, a fixed line
has been used for communication from the home base station to the core network
(for example, see PTL 1).
When the fixed line is used as a backhaul like in a technique described in PTL 1,
there are problems such as time required to install the fixed line and running costs
for the fixed line. Accordingly, the use of radio communication for the backhaul
communication is proposed as described in PTL 2.
James & Wells Ref: 312129NZ
CITATION LIST
PATENT LITERATURE
PTL 1: Japanese Patent No. 5456874
PTL 2: Japanese Patent No. 6025892
SUMMARY OF THE INVENTION
TECHNICAL PROBLEM
However, a macro cell base station is designed to perform radio communications
directly with a terminal device. So, if the radio communication is used also for the
backhaul communication of the home base station, there is a possibility that
resources allocated to the terminal device which directly connects to the macro cell
base station may decrease and the communication quality may degrade. On the
other hand, if a communication traffic volume of the terminal device which directly
connects to the macro cell base station increases, this may cause a problem in that
resources to be allocated to the backhaul communication of the home base station
may become insufficient and the communication quality of the terminal device
connected via the home base station may degrade.
Accordingly, the present invention was devised in light of the above-described
circumstances; and when communication of a relay apparatus capable of relaying
communication between a terminal device(s) and a macro cell base station is to be
controlled, it is one of objects to guarantee communication quality of a terminal
device which directly connects to the macro cell base station and communication
quality of a terminal device which connects to the macro cell base station via the
relay apparatus.
SOLUTION TO PROBLEM
A communication control system according to an aspect of the present invention is
a communication control system for controlling communication of a relay apparatus
James & Wells Ref: 312129NZ
capable of relaying communication between a terminal device(s) and a macro cell
base station, wherein the communication control system includes: an acquisition unit
that acquires communication status information including a past communication
traffic volume between the macro cell base station and the relay apparatus; a setting
unit that presets a first permitted communication traffic volume for a first
communication period during which a communication traffic volume between the
macro cell base station and the relay apparatus is equal to or more than a specified
communication traffic volume, and a second permitted communication traffic volume
for a second communication period during which the communication traffic volume
is less than the specified communication traffic volume, on the basis of the
communication status information; a measurement unit that measures a current
communication traffic volume between the macro cell base station and the relay
apparatus; and a control unit that controls the set second permitted communication
traffic volume on the basis of the measured current communication traffic volume.
Regarding the communication control system, the control unit may increase or
decrease the set second permitted communication traffic volume according to a
difference between the set second permitted communication traffic volume and the
current communication traffic volume upon communication between the macro cell
base station and the relay apparatus.
Regarding the communication control system, when the relay apparatus is to
accept a new call from the terminal device and the control unit can determine that
the current communication traffic volume upon the communication between the
macro cell base station and the relay apparatus exceeds the set second permitted
communication traffic volume, the control unit may prohibit the acceptance of the
new call.
Regarding the communication control system, the control unit may prohibit the
second permitted communication traffic volume from being decreased to a preset
lower limit communication traffic volume or less.
Regarding the communication control system, the control unit may control the set
James & Wells Ref: 312129NZ
second permitted communication traffic volume on the basis of quantity information
indicative of a quantity of the terminal devices which communicate with the relay
apparatus.
Regarding the communication control system, the control unit may control the
second permitted communication traffic volume on the basis of communication
quality including at least one of a delay in the communication between the macro cell
base station and the relay apparatus, fluctuations of the communication, and a bit
error rate of the communication.
Regarding the communication control system, the control unit may control a quantity
of the terminals whose connection with the relay apparatus is permitted, as the
second permitted communication traffic volume.
Regarding the communication control system, the setting unit may set the first
permitted communication traffic volume on the basis of a maximum quantity of the
terminal devices which can be connected.
Regarding the communication control system, the relay apparatus may include the
acquisition unit, the setting unit, and the measurement unit; and a core network may
include the control unit.
A communication control method according to an aspect of the present invention is
a communication control method for controlling communication of a relay apparatus
capable of relaying communication between a terminal device(s) and a macro cell
base station, wherein the communication control method includes the steps of:
acquiring communication status information including a past communication traffic
volume between the macro cell base station and the relay apparatus; presetting a
first permitted communication traffic volume for a first communication period during
which a communication traffic volume between the macro cell base station and the
relay apparatus is equal to or more than a specified communication traffic volume,
and a second permitted communication traffic volume for a second communication
period during which the communication traffic volume is less than the specified
James & Wells Ref: 312129NZ
communication traffic volume, on the basis of the communication status information;
measuring a current communication traffic volume between the macro cell base
station and the relay apparatus; and controlling the set second permitted
communication traffic volume on the basis of the measured current communication
traffic volume.
A program according to an aspect of the present invention is a program for causing
a computer to function as: an acquisition unit that acquires communication status
information including a past communication traffic volume between a macro cell base
station and a relay apparatus; a setting unit that presets a first permitted
communication traffic volume for a first communication period during which a
communication traffic volume between the macro cell base station and the relay
apparatus is equal to or more than a specified communication traffic volume, and a
second permitted communication traffic volume for a second communication period
during which the communication traffic volume is less than the specified
communication traffic volume, on the basis of the communication status information;
a measurement unit that measures a current communication traffic volume between
the macro cell base station and the relay apparatus; and a control unit that controls
the set second permitted communication traffic volume on the basis of the measured
current communication traffic volume.
A relay apparatus according to an aspect of the present invention is a relay apparatus
capable of relaying communication between a terminal device(s) and a macro cell
base station, wherein the relay apparatus includes: an acquisition unit that acquires
communication status information including a past communication traffic volume
between the macro cell base station and the relay apparatus; a setting unit that
presets a first permitted communication traffic volume for a first communication
period during which a communication traffic volume between the macro cell base
station and the relay apparatus is equal to or more than a specified communication
traffic volume, and a second permitted communication traffic volume for a second
communication period during which the communication traffic volume is less than
the specified communication traffic volume, on the basis of the communication status
information; a measurement unit that measures a current communication traffic
James & Wells Ref: 312129NZ
volume between the macro cell base station and the relay apparatus; and a control
signal generation unit that generates a control signal for controlling the set second
permitted communication traffic volume on the basis of the measured current
communication traffic volume.
ADVANTAGEOUS EFFECTS OF THE INVENTION
According to the present invention, necessary bandwidths for the communication
between the macro cell base station and the relay apparatus can be managed
appropriately and bandwidths used for the communication between the macro cell
base station and the relay apparatus, and terminal devices can be allocated
appropriately, so that the communication quality of a terminal device which directly
connects to the macro cell base station can be guaranteed and the communication
quality of a terminal device which connects to the macro cell base station via the
relay apparatus can be guaranteed.
BRIEF DESCRIPTION OF DRAWINGS
[Fig. 1] Fig. 1 is a schematic diagram of a mobile communications system
according to an embodiment;
[Fig. 2] Fig. 2 is a configuration diagram of a relay apparatus according to an
embodiment;
[Fig. 3] Fig. 3 is a configuration diagram of a first core network EPC (Evolved
Packet Core) according to an embodiment;
[Fig. 4] Fig. 4 is an explanatory diagram of QCI parameters according to an
embodiment;
[Fig. 5] Fig. 5 is a sequence diagram for explaining a procedure sequence for
communication control processing according to an embodiment;
[Fig. 6] Fig. 6 is a schematic diagram for explaining communication control
processing according to a first embodiment;
[Fig. 7] Fig. 7 is a schematic diagram for explaining communication control
processing according to a second embodiment; and
[Fig. 8] Fig. 8 is a schematic diagram for explaining communication control
James & Wells Ref: 312129NZ
processing according to a third embodiment.
DESCRIPTION OF EMBODIMENTS
An embodiment of the present invention will be explained below with reference to
the attached drawings. However, the embodiment explained below will be given
merely for the purpose of illustration and there is no intention to exclude application
of various variations or techniques which are not clearly specified below. In other
words, the present invention can be implemented with various modifications without
the scope departing from the gist of the invention. Furthermore, the same or similar
reference numerals are assigned to, and represent, the same or similar elements in
the illustrations in the series of drawings.
[Configuration of Mobile Communications System]
Fig. 1 is a configuration diagram of a mobile communications system according to
an embodiment. A mobile communications system 100 according to this embodiment
is illustratively a mobile communications system according to the LTE system whose
specifications are set in conformity with 3GPP and includes a radio network and a
core network. The configuration of the radio network and the configuration of the core
network will be explained sequentially below.
(Configuration of Radio Network)
Referring to Fig. 1, the mobile communications system 100 includes terminal devices
, a relay apparatus 20, and a donor base station (macro cell base station) 30 as
the configuration of the radio network. Incidentally, the radio network is called E-
UTRAN (Evolved Universal Terrestrial Radio Access Network) according to the LTE
system.
The terminal device 10 is a mobile portable communication terminal such as a
smartphone or a cell phone and is also called UE (User Equipment). Fig. 1
illustrates: terminal devices 10a that exist in a service area of a cell (the range
capable of communication) formed by the relay apparatus 20 and are connected to
the relay apparatus 20; and a terminal device 10b that exists in a service area of a
James & Wells Ref: 312129NZ
cell formed by the donor base station 30 and is connected to the donor base
station 30. The terminal devices 10a and the terminal device 10b will be hereinafter
sometimes collectively referred to as the terminal device 10.
The relay apparatus 20 can be moved and is also called a ReNB (Repeater type
eNodeB) according to the LTE system and constitutes one node in the radio
network.
The relay apparatus 20 is configured by including an access node 22 and a relay
node 24.
The access node 22 establishes radio communication with the terminal devices 10a
and provides the terminal devices 10a with packet communication services (such as
voice packet communication services and multimedia services). Radio
communication between the access node 22 and the terminal devices 10a is also
called an access link (AC: Access Link). Regarding the cell formed by the access
node 22, its cell size is of a smaller scale than that of the donor base station 30 and
the cell constructs a communication area with a radius ranging from several meters
to tens of meters.
The access node 22 establishes radio communication with the donor base station 30
via the relay node 24. The relay node 24 is also called CPE (Customer Premises
Equipment). Radio communication between the relay node 24 and the donor base
station 30 is also called backhaul (BH: Backhaul).
Incidentally, the access node 22 and the relay node 24 may be configured as
separate nodes. When they are configured as the separate nodes, the relay node 24
serves the role of the relay apparatus according to the present invention.
The donor base station 30 is also called a Donor eNB (Donor eNode B) according to
the LTE system and establishes radio communication via the relay node 24. The
donor base station 30 constructs a communication area with a radius ranging from
hundreds of meters to tens of kilometers.
James & Wells Ref: 312129NZ
(Configuration of Core Network)
Referring to Fig. 1, the mobile communications system 100 includes a first core
network EPC (Evolved Packet Core) 40, a femto core network 50 (communication
control server), and a second core network EPC 60 as the configuration of the core
network. Incidentally, this embodiment is explained as including the first core network
EPC 40 and the second core network EPC 60; however, the core network may be
configured from one core network EPC.
The first core network EPC 40 is connected to, for example, the donor base station
and has: a function that manages movements of, and certifies, individual terminal
devices 10b and the relay node 24 via the donor base station 30, and manages
processing for setting packet communication data paths; a function that performs
quality control of the radio network; a function that controls call connections to
provide mobile communications services and controls the services; and a function
that serves as a switching station to receive calls from external networks such as the
Internet 70 to contract subscribers in the radio network or subscribers who are
roaming in the radio network.
The femto core network 50 is a network for performing various kinds of management
regarding the relay apparatus 20. The femto core network 50 is connected to, for
example, a femto OAM (Femto Operations Administration Maintenance) 52 and has
a function that operates, manages, and maintains the relay apparatus 20.
The second core network EPC 60 has, for example: a function that controls call
connections to provide mobile communication services or controls the services; a
function that serves as a switching station to receive calls from external networks
such as the Internet 70 to contract subscribers in the radio network or subscribers
who are roaming in the radio network; a function that manages movements of, and
certifies, the individual terminal devices 10a in the second core network EPC 60 and
manages processing for setting packet communication data paths; and a function
that performs communication policy control such as quality control and performs
control pursuant to billing rules.
James & Wells Ref: 312129NZ
Fig. 2 is a configuration diagram of a relay apparatus according to an embodiment
of the present invention. Referring to Fig. 2, the relay apparatus 20 illustratively
includes: an information processing unit 201 that executes information processing
for controlling communication between the donor base station 30 and the relay
apparatus 20; and an information recording unit 203 that records information used
when controlling the communication between the donor base station 30 and the
relay apparatus 20, for example, communication status information JI acquired by
an information acquisition unit 205 described later and permitted communication
traffic volume information KI including at least one of a first permitted
communication traffic volume and a second permitted communication traffic volume
which are set by a permitted communication traffic volume setting unit 207.
Incidentally, the permitted communication traffic volume information KI may include
information indicative of a preset lower limit communication traffic volume
described later.
The information processing unit 201 functionally includes: the information
acquisition unit 205 (acquisition unit) that acquires communication status
information including a past communication traffic volume between the donor base
station 30 and the relay apparatus 20; a permitted communication traffic volume
setting unit 207 (setting unit) that presets a first permitted communication traffic
volume for a first communication period, during which a communication traffic
volume between the donor base station 30 and the relay apparatus 20 is equal to
or more than a specified communication traffic volume, and a second permitted
communication traffic volume for a second communication period, during which the
communication traffic volume is less than the specified communication traffic
volume, on the basis of the communication status information; a communication
traffic volume measurement unit 209 (measurement unit) that measures a current
communication traffic volume between the donor base station 30 and the relay
apparatus 20; and a control signal generation unit 211 that generates a control
signal for controlling the second permitted communication traffic volume which is
set by the permitted communication traffic volume setting unit 207 on the basis of
the current communication traffic volume measured by the communication traffic
James & Wells Ref: 312129NZ
volume measurement unit 209.
Fig. 3 is a configuration diagram of the first core network EPC according to an
embodiment of the present invention. Referring to Fig. 3, the first core network
EPC 40 illustratively includes: an information processing unit 401 that executes
information processing for controlling communication between the donor base
station 30 and the relay apparatus 20 as illustrated in Fig. 1; and an information
recording unit 403 that records the permitted communication traffic volume
information KI acquired by the information acquisition unit 405 from the relay
apparatus 20.
The information processing unit 401 functionally includes: an information
acquisition unit 405 that acquires the control signal for controlling the set second
permitted communication traffic volume, and the permitted communication traffic
volume information KI from the relay apparatus 20; and a permitted communication
traffic volume control unit 407 that controls the set second permitted
communication traffic volume on the basis of the control signal. Incidentally, the
permitted communication traffic volume information KI from the relay apparatus 20
may be included in the control signal.
Under this circumstance, a QCI (QoS Class Identifier) is set according to the LTE
specification as a parameter for controlling the quality of sessions on a radio
network side and a core network side as illustrated in Fig. 1. A session is also
called a DB (Default Bearer) and is a virtual conceptual unit indicative of a method
of handling data from a terminal device upon communication between networks.
Each QCI parameter defines one session and specifies, for example, nine-level
priorities according to whether bandwidths (a communication traffic volume per unit
time) are controlled or not, delay tolerance time, packet loss rate, and so on.
Fig. 4 is a diagram illustrating a list of QCI parameters. Referring to Fig. 4, QCI1 to
4 are GBRs (Guaranteed Bit Rates) which guarantee bandwidths; and QCI5 to 9
are Non-GBRs which do not guarantee the bandwidths. The first core network EPC
40 illustrated in Fig. 1 is designed to be capable of setting the QCI parameters
James & Wells Ref: 312129NZ
according to the communication quality in the radio network. Specifically speaking,
the first core network EPC 40 is designed to generate sessions corresponding to
the QCI parameters with respect to communication with the relay apparatus 20. A
session is called a DB (Default Bearer or Dedicated Bearer) and each DB can
secure a certain communication traffic volume in accordance with the bandwidths
(such as the communication traffic volume per unit time), delay tolerance, and bit
loss which are defined by the QCIs.
[Communication Control Processing]
The outline of communication control processing for controlling communication
between the donor base station and the relay apparatus will be described below.
The relay apparatus 20 illustrated in Fig. 1: presets a first permitted communication
traffic volume for a busy period during which the communication traffic volume
between the donor base station 30 and the relay apparatus 20 is heaviest (first
communication period), and a second permitted communication traffic volume for a
period of time during which the communication traffic volume is less than that of the
busy period (a second communication period), on the basis of the acquired
communication status information; generates a control signal for controlling the
preset second permitted communication traffic volume on the basis of a current
communication traffic volume between the donor base station 30 and the relay
apparatus 20; and transmits the control signal to the first core network EPC 40.
The first core network EPC 40 dynamically controls the preset second permitted
communication traffic volume on the basis of the received control signal. The
details of the communication control processing according to a first embodiment
will be explained below.
<First Embodiment>
The first embodiment of the communication control processing for controlling
communication between the donor base station and the relay apparatus will be
explained by using Fig. 5 and Fig. 6. Fig. 5 is a sequence diagram for explaining a
procedure sequence for the communication control processing for controlling the
communication between the donor base station and the relay apparatus. Fig. 6 is a
diagram illustrating the communication control processing when the relay
James & Wells Ref: 312129NZ
apparatus cannot acquire quantity information indicative of the quantity of terminal
devices existing in its service area.
The correspondence relationship between Fig. 5 and Fig. 6 will be explained as
follows: steps S1 and S3 in Fig. 5 correspond to period (T0 to T1) in Fig. 6; step S5
in Fig. 5 corresponds to period (T1 to T3) in Fig. 6; step S7 in Fig. 5 corresponds to
period (T3 to T4) in Fig. 6; and steps S9 and S11 in Fig. 5 correspond to period (T4
to T21) in Fig. 6. Under this circumstance, “CU (Channel Utilization)” in Fig. 6
represents an occupied bandwidth and “T” represents time. In this embodiment, a
maximum value for the occupied bandwidth is CU=64. One cell M represents the
occupied bandwidth of CU=4. Furthermore, broken line L1 represents a transition
of the permitted communication traffic volume in each of the steps mentioned
above and broken line L3 represents a transition of the bandwidth actually used for
the communication (such as the communication traffic volume per unit time).
Incidentally, the occupied bandwidth of CU=8 is used as a vacant bandwidth to be
used, for example, for the Two-Way Active Measurement Protocol (TWAMP: Two
Way Active Measurement Protocol) for a communication quality test, or for
emergency calls.
(Step S1 in Fig. 5 and T0 to T1 in Fig. 6)
The information acquisition unit 205 illustrated in Fig. 2 acquires communication
status information including a past communication traffic volume between the donor
base station 30 and the relay apparatus 20. For example, the information
acquisition unit 205 acquires, as the communication status information, the
communication traffic volume between the donor base station 30 and the relay
apparatus 20 at each communication timing executed between the donor base
station 30 and the relay apparatus 20 in the past.
More specifically, with the mobile communications system 100 illustrated in Fig. 1,
an IPsec is firstly established which is a protocol to assign a concealing function on
a packet data basis upon packet communication between the relay apparatus 20
and the first core network EPC 40. For example, once a session (DB) according to
parameter QCI5 indicated in Fig. 4 is generated and the IPsec is established,
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control data can be transmitted and received between the relay apparatus 20 and
the first core network EPC 40.
Next, after the IPsec is established, a data communication DB is further
established. The first core network EPC 40 generates a DB according to parameter
QCI9 indicated in Fig. 4 on the basis of a request from the relay apparatus 20 to
generate the data communication DB. As a result of the above-described
processing, packet data routed through the relay apparatus 20 can be transmitted
to the second core network EPC60 via this DB.
Furthermore, after the data communication DB is established, a voice
communication DB is further established. For example, the first core network EPC
40 generates a voice communication DB according to parameter QCI1 in response
to a DB generation request from the relay apparatus 20. A VoLTE DB is
established between the relay apparatus 20 and the first core network EPC 40. As
a result of the above-described processing, the voice communication from the
terminal device 10a via the core network becomes possible.
Accordingly, when the voice communication from the terminal device 10a via the
core network has been performed in the past, the information acquisition unit 205
acquires the communication traffic volume between the donor base station 30 and
the relay apparatus 20 as the communication status information. Incidentally, the
information acquisition unit 205 may be configured to acquire the communication
status information every time the voice communication from the terminal device
10a via the core network has been performed in the past, or acquire the
communication status information collectively after a specified number of voice
communications are performed. Furthermore, the communication status
information may include, besides the past communication traffic volume,
information regarding the communication quality such as a delay amount, delay
fluctuations (jitter), bit error amount, and bit error rate of the communication
between the donor base station 30 and the relay apparatus 20 in the past.
(Step S3 in Fig. 5 and T0 to T1 in Fig. 6)
James & Wells Ref: 312129NZ
Upon starting this voice communication, the first core network EPC 40 illustrated in
Fig. 1 registers the position of the relay apparatus 20. For example, the first core
network EPC 40 checks whether or not the relay apparatus 20 exists in a service
area within a communication-enabled range of the donor base station 30 which
connects to the first core network EPC 40; and if the relay apparatus 20 exists in
the service area, the first core network EPC 40 registers the position of the relay
apparatus 20.
(Step S5 in Fig. 5 and T1 to T3 in Fig. 6)
The permitted communication traffic volume setting unit 207 illustrated in Fig. 2
presets, on the basis of the communication status information acquired in step S1
in Fig. 5: a permitted communication traffic volume CU=52 (first permitted
communication traffic volume) (see broken line L5) corresponding to an effective
throughput value during a busy period when the communication traffic volume is
heaviest upon communication between the donor base station 30 and the relay
apparatus 20; and a permitted communication traffic volume CU=36 (second
permitted communication traffic volume) (see broken line L7) for a period during
which the communication traffic volume is less than that of the busy period (for
example, periods other than T14 to T17 in Fig. 6). Under this circumstance, the
permitted communication traffic volume setting unit 207 may be configured to set
the first permitted communication traffic volume on the basis of a maximum
quantity of terminal devices 10a which can be connected to the relay apparatus 20.
Incidentally, the permitted communication traffic volume setting unit 207 does not
necessarily have to set the permitted communication traffic volume CU=52 for the
busy period or the permitted communication traffic volume CU=36 for the period
during which the communication traffic volume is less than that of the busy period,
with respect to the period corresponding to T1 to T3; and it is only necessary to set
them before the period (T3 to T4) when a VoLTE communication described later is
started. Furthermore, it is useful to measure the effective throughput value for the
busy period when the communication traffic volume is heaviest upon the
communication between the donor base station 30 and the relay apparatus 20
because the permitted communication traffic volume can be controlled
appropriately, for example, according to the position of the relay apparatus 20
James & Wells Ref: 312129NZ
located within the cell of the donor base station 30. Specifically speaking, when the
relay apparatus 20 is located at, for example, an edge of the cell (Cell edge) of the
donor base station 30, the effective throughput of the communication is low; and
when the relay apparatus 20 is located around the center of the cell of the donor
base station 30, the effective throughput of the communication is high. Accordingly,
the communication between the donor base station 30 and the relay apparatus 20
can be controlled appropriately by measuring the effective throughput value
according to the position of the relay apparatus 20 located within the cell of the
donor base station 30 and using the measured value for this communication control
processing.
(Step S7 in Fig. 5 and T3 to T4 in Fig. 6)
When the necessary processing for the voice communication according to the
VoLTE is completed as described in detail in step S1 above, the voice
communication from the terminal device 10a via the core network can be started.
Incidentally, the establishment of the IPsec and the establishment of the data
communication DB are completed at this point in time.
(Step S9 in Fig. 5)
When the voice communication according to the VoLTE actually starts, the
communication traffic volume measurement unit 209 (measurement unit) illustrated
in Fig. 2 measures a current communication traffic volume between the donor base
station 30 and the relay apparatus 20 (see the broken line L3).
(Step S11 in Fig. 5)
The control signal generation unit 211 illustrated in Fig. 2 generates a control signal
for controlling the second permitted communication traffic volume (see the broken
line L1) set by the permitted communication traffic volume setting unit 207 on the
basis of the current communication traffic volume (see the broken line L3)
measured by the communication traffic volume measurement unit 209. Then, the
relay apparatus 20 transmits the control signal to the first core network EPC 40
illustrated in Fig. 1 and the permitted communication traffic volume control unit 407
for the first core network EPC 40 illustrated in Fig. 3 controls the set second
James & Wells Ref: 312129NZ
permitted communication traffic volume (see the broken line L1) on the basis of the
control signal.
For example, the permitted communication traffic volume control unit 407 for the
first core network EPC 40 increases or decreases the second permitted
communication traffic volume CU=36 in accordance with the difference between
the second permitted communication traffic volume CU=36 (see the broken line L1)
set by the permitted communication traffic volume setting unit 207 and the current
communication traffic volume (see the broken line L3) upon the communication
between the donor base station 30 and the relay apparatus 20. Incidentally, the
first permitted communication traffic volume (see the broken line L5) set by the
permitted communication traffic volume setting unit 207, that is, the permitted
communication traffic volume for the busy period during which the communication
traffic volume upon the communication between the donor base station 30 and the
relay apparatus 20 is heaviest is a set value as a limit quantity (threshold value)
and thereby cannot be controlled.
More specifically, difference D1 between the permitted communication traffic
volume CU=36 set by the permitted communication traffic volume setting unit 207
and the current communication traffic volume (CU=20) at time T4 indicated in Fig. 6
is CU=16. In this embodiment, control of the set second permitted communication
traffic volume CU=36 is executed, for example, when the difference becomes
CU=4 or less. Therefore, since the difference is more than CU=4 at time T4, the set
second permitted communication traffic volume CU=36 is not controlled.
Subsequently, at time T9, difference D2 between the second permitted
communication traffic volume CU=36 set by the permitted communication traffic
volume setting unit 207 and the current communication traffic volume (CU=32) is
CU=4. Therefore, since the difference is CU=4 or less, the permitted
communication traffic volume control unit 407 for the first core network EPC 40
increases the second permitted communication traffic volume CU=36 set by the
permitted communication traffic volume setting unit 207.
Next, regarding period T9 to T14, the current communication traffic volume
James & Wells Ref: 312129NZ
continues to increase, so that the second permitted communication traffic volume is
controlled to also continue increasing. Then, regarding the period T14 to T17, the
second permitted communication traffic volume reaches CU=52 which is the
threshold value (see the broken line L5), so that the second permitted
communication traffic volume will not increase any further. Under this
circumstance, the permitted communication traffic volume control unit 407 for the
first core network EPC 40 may be configured, as indicated at period T15 to T16
and cell MA, so that when the relay apparatus 20 is to accept a new call from the
terminal device 10 and it can be judged that the communication traffic volume per
unit time which is currently used upon the communication between the donor base
station 30 and the relay apparatus 20 (see the broken line L3) exceeds the set
second permitted communication traffic volume CU=52 (threshold value) (see the
broken lines L3 and L5), the permitted communication traffic volume control unit
407 is prohibited from accepting the new call. Furthermore, the permitted
communication traffic volume control unit 407 may be configured so that when the
current communication traffic volume starts to decrease as indicated at period T17
to T21 and it is recognized that this decrease tendency continues, the permitted
communication traffic volume control unit 407 decreases the second permitted
communication traffic volume.
Furthermore, when the permitted communication traffic volume control unit 407 for
the first core network EPC 40 decreases the second permitted communication
traffic volume CU=36, the permitted communication traffic volume control unit 407
may be configured to be prohibited from decreasing the second permitted
communication traffic volume to a preset lower limit communication traffic volume
CU=8 (see broken line L9) or less. Since the lower limit communication traffic
volume CU=8 is secured as a vacant bandwidth to be used, for example, for the
Two-Way Active Measurement Protocol (TWAMP) for the communication quality
test or for emergency calls as mentioned earlier, control of the permitted
communication traffic volume to the extent making the execution of the TWAMP or
the emergency calls impossible should be prohibited.
<Second Embodiment>
James & Wells Ref: 312129NZ
A second embodiment is different from the first embodiment because in the second
embodiment the relay apparatus can acquire quantity information indicative of the
quantity of terminal devices which communicate with the relay apparatus and exist
in its service area, while in the first embodiment the relay apparatus 20 cannot
acquire the quantity information indicative of the quantity of terminal devices which
communicate with the relay apparatus. In other words, when controlling the preset
second permitted communication traffic volume in the second embodiment, the
relay apparatus 20 controls the preset second permitted communication traffic
volume further on the basis of the acquired quantity information indicative of the
quantity of terminal devices existing in the service area, in addition to the current
communication traffic volume. In the following explanation, reference will be made
particularly to the difference from the communication control processing according
to the first embodiment.
Fig. 7 is a diagram illustrating the communication control processing when the relay
apparatus can acquire the quantity information indicative of the quantity of terminal
devices which communicate with the relay apparatus and exist in its service area.
When the information acquisition unit 205 illustrated in Fig. 2 can acquire the
quantity information indicative of the quantity of terminal devices 10 which exist in
the service area and communicates with the relay apparatus 20 as illustrated in
Fig. 7, the permitted communication traffic volume control unit 407 for the first core
network EPC 40 illustrated in Fig. 3 controls the second permitted communication
traffic volume (see the broken line L1) set by the permitted communication traffic
volume setting unit 207 for the relay apparatus 20 illustrated in Fig. 2 further on the
basis of the quantity information indicative of the quantity of the terminal devices
existing in the service area in addition to the current communication traffic volume.
More specifically, the permitted communication traffic volume control unit 407 is
configured so that: when the permitted communication traffic volume control unit
407 perceives that the terminal device 10a which communicates with the relay
apparatus 20 becomes no longer capable of continuing communicating with the
relay apparatus 20 because, for example, it has left the communication-enabled
area of the relay apparatus 20 (UE detach) as indicated at time T6 in Fig. 7, the
permitted communication traffic volume control unit 407 stops increasing the
James & Wells Ref: 312129NZ
second permitted communication traffic volume; and when the permitted
communication traffic volume control unit 407 perceives that communication
between the relay apparatus 20 and a new terminal device 10 is started (UE
attach) as indicated at time T8 in Fig. 6, the permitted communication traffic volume
control unit 407 increases the second permitted communication traffic volume.
<Third Embodiment>
In a third embodiment, the second permitted communication traffic volume set by
the permitted communication traffic volume setting unit 207 illustrated in Fig. 2 is
controlled on the basis of communication quality, as the current communication
traffic volume, including at least one of a delay amount, delay fluctuations (jitter),
and a bit error rate of the current communication between the donor base station
and the relay apparatus 20. Under this circumstance, the first embodiment and
the second embodiment have been described by explaining that the permitted
communication traffic volume control unit which controls the second permitted
communication traffic volume set by the permitted communication traffic volume
setting unit 207 is included in the first core network EPC 40 as illustrated in Fig. 3;
however, in the third embodiment, the permitted communication traffic volume
control unit is included in the relay apparatus 20. Incidentally, for example,
components included in the relay apparatus 20 may be included in the first core
network EPC 40 within a range not causing any contradiction to the content of the
communication control processing and components included in the first core
network EPC 40 may be included in the relay apparatus 20 within a range not
causing any contradiction to the content of the communication control processing.
Fig. 8 is a diagram illustrating the communication control processing when the
current communication traffic volume between the donor base station 30 and the
relay apparatus 20 can be acquired. Under this circumstance, the “number of calls”
in Fig. 8 represents the number of calls of the terminal device 10 and the number of
calls: 1 corresponds to “CU”: 1 as illustrated in Fig. 6 and Fig. 7. Furthermore, “T”
represents time in the same manner as in Fig. 6 and Fig. 7. Referring to Fig. 8, the
permitted communication traffic volume control unit included in the relay apparatus
dynamically increases or decreases the second permitted communication traffic
James & Wells Ref: 312129NZ
volume set by the permitted communication traffic volume setting unit 207
illustrated in Fig. 2 (see the broken line L1) on the basis of the communication
quality including at least one of the delay amount, the delay fluctuations (jitter), and
the bit error rate of the current communication between the donor base station 30
and the relay apparatus 20 which are measured by the communication traffic
volume measurement unit 209 illustrated in Fig. 2 at arbitrary timing. More
specifically, the permitted communication traffic volume control unit is configured to
control the number of calls (quantity) of the terminal devices 10a, whose
connection with the relay apparatus 20 is permitted, as the second permitted
communication traffic volume.
Incidentally, when the permitted communication traffic volume control unit
decreases the second permitted communication traffic volume, the permitted
communication traffic volume control unit may be configured to be prohibited from
decreasing the second permitted communication traffic volume to a preset lower
limit number of calls = 8 (lower limit communication traffic volume) (see broken line
L9) or less.
[Advantageous Effects]
When controlling communication of the relay apparatus 20 capable of relaying
communication between the terminal device 20 and the donor base station 30
according to the first embodiment of the present invention as described above, the
first permitted communication traffic volume for the first communication period,
during which the communication traffic volume between the donor base station 30
and the relay apparatus 20 is equal to or more than a specified communication
traffic volume, and the second permitted communication traffic volume for the
second communication period, during which the communication traffic volume is
less than the specified communication traffic volume, are preset and the set
second permitted communication traffic volume is controlled on the basis of the
current communication traffic volume between the donor base station 30 and the
relay apparatus 20. Therefore, necessary bandwidths for the communication
between the donor base station 30 and the relay apparatus 20 can be managed
appropriately and bandwidths used for the communication between the donor base
James & Wells Ref: 312129NZ
station 30 and the relay apparatus 20, and the terminal devices 10a can be
allocated appropriately, so that the communication quality of the terminal device
10b which directly connects to the donor base station 30 can be guaranteed and
the communication quality of the terminal device 10a which connects to the donor
base station 30 via the relay apparatus 20 can be guaranteed.
When controlling the preset second permitted communication traffic volume
according to the second embodiment of the present invention, the preset second
permitted communication traffic volume is controlled further on the basis of the
quantity information indicative of the quantity of terminal devices 10 which exist in
the service area and communicate with the relay apparatus 20, in addition to the
current communication traffic volume. Therefore, the second permitted
communication traffic volume can be controlled more accurately. So, when
controlling the communication of the relay apparatus 20 capable of relaying the
communication between the terminal device 10 and the donor base station 30, the
communication quality of the terminal device 10b which directly connects to the
donor base station 30 can be guaranteed more appropriately and the
communication quality of the terminal device 10a which connects to the donor base
station 30 via the relay apparatus 20 can be guaranteed more appropriately.
According to the third embodiment of the present invention, the permitted
communication traffic volume control unit of the relay apparatus can control the set
second permitted communication traffic volume on the basis of the communication
quality including at least one of the delay amount, the delay fluctuations (jitter), and
the bit error rate of the current communication between the donor base station 30
and the relay apparatus 20. Therefore, the second permitted communication traffic
volume can be controlled more elaborately.
[Other Embodiments]
The present invention has been described by referring to the embodiments as
described above; however, the description and drawings which constitute part of this
disclosure should not be understood to limit this invention. Various substitute
embodiments, examples, and techniques to be operated will be made clear for those
James & Wells Ref: 312129NZ
skilled in the art on the basis of this disclosure.
The respective processing steps explained in Fig. 5 can be executed by arbitrarily
changing the order or in parallel within a range not causing any contradiction to the
processing content. Referring to Fig. 5, for example, step S1 and step S3 may be
executed by changing the order or step S1 and step S3 may be executed in
parallel.
The aforementioned embodiments have described examples of a mobile
communications system according to the LTE specification which is the
telecommunications specification for mobile communications; however, the
invention is not limited to such examples and the present invention can also be
applied to other telecommunications specifications and any telecommunications
specifications to be established in future. Specifically speaking, since the macro
cell base station is designed to perform radio communication directly with terminal
devices, the present invention can be applied as long as it is a system in which
there is fear of the occurrence of the following problems: if the radio communication
is also used for the backhaul communication of the relay apparatus, resources
allocated to the terminal device which directly connects to the macro cell base
station may decrease and the communication quality may degrade; and on the
other hand, if the communication traffic volume of the terminal device which directly
connects to the macro cell base station increases, resources allocated to the
backhaul communication of the relay apparatus may become insufficient and the
communication quality of the terminal device connected via the relay apparatus
may degrade. Necessary bandwidths for the communication between the macro
cell base station and the relay apparatus can be managed appropriately and
bandwidths used for the communication between the macro cell base station and
the relay apparatus, and the terminal devices can be allocated appropriately by
applying the communication control method, etc., according to the present
invention. So, it is possible to expect the operation and effect capable of
guaranteeing the communication quality of the terminal device which directly
connects to the macro cell base station, and guaranteeing the communication
quality of the terminal device which connects to the macro cell base station via the
James & Wells Ref: 312129NZ
relay apparatus.
REFERENCE SIGNS LIST
terminal device
relay apparatus
22 access node
24 relay node
donor base station (macro cell base station)
40 first core network EPC
50 femto core network
60 second core network EPC
100 mobile communications system
201, 401 information processing unit
203, 403 recording unit
205, 405 information acquisition unit
207 permitted communication traffic volume setting unit
209 communication traffic volume measurement unit
211 control signal generation unit
407 permitted communication traffic volume control unit
James & Wells Ref: 312129NZ
Claims (12)
- [Claim 1] A communication control system including a relay apparatus capable of relaying communication between a terminal device or terminal devices and a macro cell base station, the communication control system comprising: an acquisition unit that acquires communication status information including a past communication traffic volume between the macro cell base station and the relay apparatus; a setting unit that presets a first permitted communication traffic volume for a first communication period during which a communication traffic volume between the macro cell base station and the relay apparatus is equal to or more than a specified communication traffic volume, and a second permitted communication traffic volume for a second communication period during which the communication traffic volume is less than the specified communication traffic volume, on the basis of the communication status information; a measurement unit that measures a current communication traffic volume between the macro cell base station and the relay apparatus; and a control unit that controls the set second permitted communication traffic volume on the basis of the measured current communication traffic volume.
- [Claim 2] The communication control system according to claim 1, wherein the control unit increases or decreases the set second permitted communication traffic volume according to a difference between the set second permitted communication traffic volume and the current communication traffic volume upon communication between the macro cell base station and the relay apparatus.
- [Claim 3] The communication control system according to claim 1 or 2, wherein when the relay apparatus is to accept a new call from the terminal device and the control unit can determine that the current communication traffic volume upon the communication between the macro cell base station and the relay apparatus exceeds the set second permitted communication traffic volume, the control unit prohibits the acceptance of the new call. James & Wells Ref: 312129NZ
- [Claim 4] The communication control system according to any one of claims 1 to 3, wherein the control unit prohibits the second permitted communication traffic volume from being decreased to a preset lower limit communication traffic volume or less.
- [Claim 5] The communication control system according to any one of claims 1 to 4, wherein the control unit controls the set second permitted communication traffic volume on the basis of quantity information indicative of a quantity of the terminal devices which communicate with the relay apparatus.
- [Claim 6] The communication control system according to any one of claims 1 to 5, wherein the control unit controls the second permitted communication traffic volume on the basis of communication quality including at least one of a delay in the communication between the macro cell base station and the relay apparatus, fluctuations of the communication, and a bit error rate of the communication.
- [Claim 7] The communication control system according to any one of claims 1 to 6, wherein the control unit controls a quantity of the terminals whose connection with the relay apparatus is permitted, as the second permitted communication traffic volume.
- [Claim 8] The communication control system according to any one of claims 1 to 7, wherein the setting unit sets the first permitted communication traffic volume on the basis of a maximum quantity of the terminal devices which can be connected.
- [Claim 9] The communication control system according to any one of claims 1 to 8, wherein the relay apparatus includes the acquisition unit, the setting unit, and the measurement unit; and a core network includes the control unit.
- [Claim 10] A communication control method for controlling communication of a relay apparatus capable of relaying communication between a terminal device or terminal devices and a macro cell base station, James & Wells Ref: 312129NZ the communication control method comprising the steps of: acquiring communication status information including a past communication traffic volume between the macro cell base station and the relay apparatus; presetting a first permitted communication traffic volume for a first communication period during which a communication traffic volume between the macro cell base station and the relay apparatus is equal to or more than a specified communication traffic volume, and a second permitted communication traffic volume for a second communication period during which the communication traffic volume is less than the specified communication traffic volume, on the basis of the communication status information; measuring a current communication traffic volume between the macro cell base station and the relay apparatus; and controlling the set second permitted communication traffic volume on the basis of the measured current communication traffic volume.
- [Claim 11] A program including computer executable instructions for causing a computer to: function as an acquisition unit that acquires communication status information including a past communication traffic volume between a macro cell base station and a relay apparatus; function as a setting unit that presets a first permitted communication traffic volume for a first communication period during which a communication traffic volume between the macro cell base station and the relay apparatus is equal to or more than a specified communication traffic volume, and a second permitted communication traffic volume for a second communication period during which the communication traffic volume is less than the specified communication traffic volume, on the basis of the communication status information; function as a measurement unit that measures a current communication traffic volume between the macro cell base station and the relay apparatus; and function as a control unit that controls the set second permitted communication traffic volume on the basis of the measured current communication traffic volume. James & Wells Ref: 312129NZ
- [Claim 12] A relay apparatus capable of relaying communication between a terminal device or terminal devices and a macro cell base station, the relay apparatus comprising: an acquisition unit that acquires communication status information including a past communication traffic volume between the macro cell base station and the relay apparatus; a setting unit that presets a first permitted communication traffic volume for a first communication period during which a communication traffic volume between the macro cell base station and the relay apparatus is equal to or more than a specified communication traffic volume, and a second permitted communication traffic volume for a second communication period during which the communication traffic volume is less than the specified communication traffic volume, on the basis of the communication status information; a measurement unit that measures a current communication traffic volume between the macro cell base station and the relay apparatus; and a control signal generation unit that generates a control signal for controlling the set second permitted communication traffic volume on the basis of the measured current communication traffic volume.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017-007463 | 2017-01-19 | ||
JP2017007463A JP6378373B2 (en) | 2017-01-19 | 2017-01-19 | COMMUNICATION CONTROL SYSTEM, COMMUNICATION CONTROL METHOD, PROGRAM, AND RELAY DEVICE |
PCT/JP2017/002545 WO2018135009A1 (en) | 2017-01-19 | 2017-01-25 | Communication control system, communication control method, program and relay device |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ755723A NZ755723A (en) | 2021-03-26 |
NZ755723B2 true NZ755723B2 (en) | 2021-06-29 |
Family
ID=
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