WO2015129242A1 - 無線通信制御装置、無線通信制御方法、記憶媒体、および無線通信制御システム - Google Patents
無線通信制御装置、無線通信制御方法、記憶媒体、および無線通信制御システム Download PDFInfo
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- WO2015129242A1 WO2015129242A1 PCT/JP2015/000873 JP2015000873W WO2015129242A1 WO 2015129242 A1 WO2015129242 A1 WO 2015129242A1 JP 2015000873 W JP2015000873 W JP 2015000873W WO 2015129242 A1 WO2015129242 A1 WO 2015129242A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
- H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
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- 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
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
- H04W52/0219—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave where the power saving management affects multiple terminals
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- 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]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/10—Access point devices adapted for operation in multiple networks, e.g. multi-mode access points
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a wireless communication control device, a wireless communication control method, a storage medium, and a wireless communication control system.
- IEEE802.15.4g / e can be used as one of 920MHz band wireless communication standards.
- IEEE 802.15.4 g / e is a standard for the sub-giga band, and is mainly used in WPAN (Wireless Personal Area Network).
- IEEE is an abbreviation for Institute of Electrical and Electronics Engineers.
- IEEE 802.11ah which is expected to be used as a sub-gigabit WiFi (Wireless Fidelity)
- IEEE 802.11ah which is expected to be used as a sub-gigabit WiFi (Wireless Fidelity)
- it is considered that a monitoring system using a wireless sensor network that utilizes these two standards will be realized in the near future.
- the above problem may occur in addition to the coexistence of the WPAN standard and the WLAN standard. That is, when a plurality of wireless communication systems coexist in a certain environment, there arises a problem that interference may occur between the plurality of wireless communication systems. Therefore, realization of a technique for reducing interference between different communication methods is desired.
- Patent Document 1 is known as one of techniques for reducing such interference.
- Patent Document 1 describes a technique for reducing interference between different communication systems sharing a common wireless communication medium.
- Patent Document 1 assumes a standard corresponding to IEEE802.15.3 and IEEE802.11 as two wireless communication systems that interfere with each other.
- CAP Contention Access Period
- CFP Contention Period Period
- CP Contention Period
- CFP Commission Period Equivalent to the IEEE 802.11 standard.
- unnecessary communication collision can be avoided by synchronizing the CAP and CFP corresponding to the IEEE 802.15.3 standard with the CP and CFP corresponding to the IEEE 802.11 standard.
- Patent Document 2 is known as a related technique.
- Patent Document 2 describes a technique for effectively switching a frequency band used for wireless communication between a plurality of wireless devices to another one.
- one wireless device notifies a request for switching the first frequency band to another second frequency band.
- the other wireless device notifies a response for permitting switching to the second frequency band, notifies the schedule information, and starts wireless communication based on the schedule information.
- it is possible to effectively switch the frequency band used for wireless communication to another by such a method.
- Patent Document 3 is known as a related technique.
- a session is operated in the first frequency band, while an agreement to operate the session in the second frequency band is set and a physical link is established in the second frequency band.
- a technique for transferring a session to a band is described.
- the length of the CP / CFP of the communication network corresponding to the IEEE 802.11 standard is limited to the length of the CAP / CFP corresponding to the IEEE 802.15.3 standard. For this reason, there has been a problem that interference cannot be suppressed during the CP period equivalent to the IEEE 802.11 standard (the CAP period equivalent to the IEEE 802.15.3 standard). Further, since there is a CFP period corresponding to the IEEE 802.11 standard, communication is performed according to the schedule during the CFP period. Therefore, there is a problem that there is a concern that the maximum throughput may be reduced.
- Patent Documents 2 and 3 are systems that use a plurality of channels in order to suppress a decrease in communication efficiency due to interference between a plurality of communication systems. For this reason, all of the suppression methods described in Patent Documents 2 and 3 have a problem that they are inefficient.
- an object of the present invention is to provide a wireless communication capable of solving the problem that interference between a plurality of wireless communication methods cannot be effectively prevented when a plurality of wireless communication methods are used simultaneously.
- a control device, a wireless communication control method, a storage medium, and a wireless communication control system are provided.
- the wireless communication control device of the present invention includes a first communication method control unit that performs wireless communication by a first wireless communication method, and a second communication method control unit that performs wireless communication by a second wireless communication method,
- the second communication method control unit detects the start of wireless communication by the first wireless communication method, and performs wireless communication by the second wireless communication method during a wireless communication period by the first wireless communication method. And operates so as to perform wireless communication according to the second wireless communication method outside the wireless communication period according to the first wireless communication method.
- a wireless communication control method includes a plurality of first communication method controllers that perform wireless communication using a first wireless communication method and a second communication method control unit that performs wireless communication using a second wireless communication method.
- a method for controlling wireless communication by a wireless communication method wherein the second communication method control unit detects the start of wireless communication by a first wireless communication method and is in a wireless communication period by the first wireless communication method. Controls not to perform wireless communication by the second wireless communication method, and controls to perform wireless communication by the second wireless communication method outside the wireless communication period by the first wireless communication method. .
- the storage medium of the present invention uses a first communication method control unit that performs wireless communication by the first wireless communication method and a second communication method control unit that performs wireless communication by the second wireless communication method.
- a computer of a wireless communication control device that controls wireless communication according to the method causes the second communication method control unit to detect the start of wireless communication according to the first wireless communication method, and wireless communication according to the first wireless communication method. Operate so as not to perform wireless communication by the second wireless communication method during the period, and operate to perform wireless communication by the second wireless communication method outside the wireless communication period by the first wireless communication method
- a program for executing processing is stored.
- the wireless communication control system of the present invention includes a first communication method control device that performs wireless communication by a first wireless communication method, and a second communication method control device that performs wireless communication by a second wireless communication method,
- the second communication method control device detects the start of wireless communication by the first wireless communication method, and performs wireless communication by the second wireless communication method during a wireless communication period by the first wireless communication method. And operates so as to perform wireless communication according to the second wireless communication method outside the wireless communication period according to the first wireless communication method.
- FIG. 1 It is a figure which shows the structural example of the wireless sensor network which concerns on the 1st Embodiment of this invention. It is a block diagram which shows an example of a structure of the gateway shown in FIG. It is a figure for demonstrating the parameter used when performing radio
- FIG. 1 It is a block diagram which shows an example of a structure of the backhaul node shown in FIG. It is a block diagram which shows an example of a structure of the gateway shown in FIG. It is a block diagram which shows the structural example of the radio
- FIG. 1 is a diagram illustrating a configuration example of a wireless sensor network 1 (WSN, Wireless Sensor Networks) according to the first embodiment of the present invention.
- the wireless sensor network 1 is a wireless sensor network that performs wireless communication using the 920 MHz band. Specifically, in the wireless sensor network 1, wireless communication based on the WPAN standard and wireless communication based on the WLAN standard are performed using the 920 MHz band.
- the wireless sensor network 1 includes a gateway 2 (wireless communication control device), a WPAN terminal 3 (WPAN terminals 3a, 3b, 3c,...), A WLAN terminal 4 (WLAN terminals 4a, 4b, 4c,...), A backhaul. Node 5.
- the WPAN terminal 3 and the WLAN terminal 4 correspond to sensor nodes of the wireless sensor network 1.
- the gateway 2 corresponds to a sink node of the wireless sensor network 1.
- FIG. 1 illustrates the case where the number of WPAN terminals 3 and WLAN terminals 4 is “3”, but this is merely an example, and in the present embodiment, the number of WPAN terminals 3 and WLAN It does not depend on the number of terminals 4.
- the number of WPAN terminals 3 and WLAN terminals 4 may be two or four or more. Further, the number of WPAN terminals 3 and the number of WLAN terminals 4 may be different.
- Wireless communication using radio waves can be executed between the gateway 2 and the WPAN terminal 3 and between the gateway 2 and the WLAN terminal 4. Specifically, wireless communication based on the WPAN standard (for example, IEEE802.15.4g / e) is performed between the gateway 2 and the WPAN terminal 3, and the WLAN standard (for example, the WLAN terminal 4). , IEEE802.11ah) is performed.
- the WPAN standard for example, IEEE802.15.4g / e
- the WLAN standard for example, the WLAN terminal 4
- IEEE802.11ah IEEE802.11ah
- the gateway 2 and the backhaul node 5 are configured to be able to perform wireless communication based on the WLAN standard (for example, IEEE 802.11ah).
- the backhaul node 5 is connected to the Internet 6 by wire.
- the center frequencies of the communication channels used between the gateway 2 and the WPAN terminal 3 and between the gateway 2 and the WLAN terminal 4 are the same (for example, 924 MHz).
- the wireless sensor network 1 in the present embodiment constitutes a star type network topology centered on the gateway 2. Therefore, data (sensor data) sensed by the WPAN terminal 3 and the WLAN terminal 4 is collected to the gateway 2 and transmitted to the Internet 6 via the backhaul node 5, for example.
- the wireless sensor network 1 configures a star-type network topology is illustrated, but the wireless sensor network 1 may configure, for example, a mesh-type network topology. Absent.
- the gateway 2 is not only a coordinator in the WPAN standard, but also an access point (AP, Access Point) in the WLAN standard.
- the coordinator is a node that controls communication at the center of the network in the WPAN standard.
- An access point is a node that controls communication at the center of the network in the WLAN standard. That is, the gateway 2 has a function of controlling both wireless communication using the WPAN standard and wireless communication using the WLAN standard performed in the wireless sensor network 1.
- the gateway 2 also serves as a sink node in the wireless sensor network 1 as described above. That is, the gateway 2 has a function of collecting data sensed by the WPAN terminal 3 and the WLAN terminal 4 which are sensor nodes. In the present embodiment, the gateway 2 transmits data collected from the WPAN terminal 3 and the WLAN terminal 4 to the Internet 6 via the backhaul node 5. Note that the gateway 2 may have a function of collecting collected data into a database, a function of performing predetermined calculation processing using the collected data, and the like.
- the gateway 2 includes a harmonized controller 21 (control means), a WPAN communication control unit 22 (first communication method control unit), a WLAN communication control unit 23 (second communication method control unit), have.
- the harmonized controller 21 has a function of performing predetermined control on the WPAN communication control unit 22, a function of performing predetermined control on the WLAN communication control unit 23, and the like. Specifically, the harmonized controller 21 in this embodiment controls the superframe length SD and the beacon interval BI, which are parameters used when wireless communication is performed according to the WPAN standard. Further, the harmonized controller 21 controls a NAV (Network Allocation Vector) length DUR, which is a parameter (included in a CTS (Clear to Send) frame described later) used when wireless communication is performed according to the WLAN standard. Furthermore, the harmonized controller 21 manages the timing at which the WPAN communication control unit 22 transmits a beacon and the timing at which the WLAN communication control unit 23 transmits a CTS frame. In addition, the harmonized controller 21 instructs the start of wireless communication according to the WLAN standard. Then, the harmonized controller 21 collects data sensed by the WPAN terminal 3 or the WLAN terminal 4 and transfers it to the backhaul node 5 as described above
- the harmonized controller 21 has various functions. The roles of the harmonized controller 21 are enumerated as follows, for example. -WPAN SD and BI management-WPAN beacon transmission timing instruction (WPAN communication start instruction) -WLAN NAV length management-WLAN CTS transmission timing instruction-WLAN communication start instruction-Transfer of collected WPAN / WLAN communication data to backhaul node 5
- FIG. 3A performs wireless communication in accordance with the WPAN standard It is a figure for demonstrating the parameter used in the case.
- FIG. 3B is a diagram for explaining parameters used when wireless communication is performed according to the WLAN standard.
- the super frame length SD the beacon interval BI, the NAV length DUR, and the CTS frame (wireless communication signals including information indicating the activity period) controlled by the harmonized controller 21 will be described in detail.
- the superframe in the present embodiment is composed of three parts: a beacon that is a synchronization signal, a CAP period (Contention Access Period), and a CFP period (Contention Free Period).
- the CAP period is a period for competing for communication rights in CSMA / CA (Carrier Sense Multiple Access / Collection Avoidance), and is a period for acquiring the right to use the channel and communicating.
- CSMA / CA Carrier Sense Multiple Access / Collection Avoidance
- all WPAN terminals 3 can access the channel.
- the CFP period is a period in which the gateway 2 as a coordinator performs communication by managing the communication timing schedule. In the CFP period, only the WPAN terminal 3 permitted by the gateway 2 is controlled to perform communication.
- the super frame in this embodiment is composed of a beacon, a CAP period, and a CFP period.
- the harmonized controller 21 controls the super frame length SD, which is the length of such a super frame, by controlling the length of the CAP period and the CFP period, for example.
- the beacon interval BI is an interval from when a beacon is transmitted until the next beacon is transmitted.
- the super frame length SD occupies a part of the beacon interval BI. Therefore, the harmonized controller 21 controls the beacon interval BI to be longer than the super frame length SD.
- the harmonized controller 21 controls the super frame length SD and the beacon interval BI.
- beacon transmission, wireless communication in the CAP period, and the CFP period are performed.
- wireless communication using the WPAN standard is not performed from the elapse of the super frame length SD until the next beacon transmission (a period obtained by subtracting the super frame length SD from the beacon interval BI). That is, the harmonized controller 21 controls the super frame length SD and the beacon interval BI, thereby not performing communication using the active period (activity period) in which communication is performed using the WPAN standard and the WPAN standard.
- the inactive period (inactive period) which is a period is controlled.
- the harmonized controller 21 notifies the WPAN communication control unit 22 of the controlled super frame length SD and beacon period BI. That is, the harmonized controller 21 sets an active period and an inactive period for the WPAN communication control unit 22. For this reason, as will be described later, the WPAN communication control unit 22 performs wireless communication in the active section according to the notification from the harmonized controller 21, but does not perform wireless communication in the inactive section. Further, the WPAN communication control unit 22 transmits a beacon including information indicating the superframe length SD and the beacon interval BI received from the harmonized controller 21. For this reason, the WPAN terminal 3 can know the superframe length SD and the beacon interval BI by receiving the beacon transmitted by the WPAN communication control unit 22.
- the WPAN terminal 3 performs wireless communication in the active section, but does not perform wireless communication in the inactive section.
- the harmonized controller 21 controls the wireless communication using the WPAN standard by notifying the WPAN communication control unit 22 of the super frame length SD and the beacon period BI.
- the CTS frame is a signal for permitting transmission.
- the CTS frame is a signal that is generally transmitted as a response to an RTS (Request To Send) frame.
- the CTS frame includes information indicating a period for occupying a channel for transmission. The period of occupying this channel is the NAV length DUR.
- wireless communication using the WLAN standard is not performed by the NAV length DUR indicated by the information included in the CTS frame.
- the WLAN communication control unit 23 transmits a CTS frame in accordance with an instruction from the harmonized controller 21, it shifts to the non-communication mode by an amount corresponding to the NAV length indicated by the information included in the CTS frame.
- the WLAN terminal 4 that has received the CTS frame shifts to a non-communication mode in which communication is not performed for the NAV length DUR indicated by the information included in the received CTS frame.
- wireless communication using the WLAN standard is controlled by the NAV length DUR.
- the harmonized controller 21 controls the period during which wireless communication according to the WLAN standard is not performed by instructing the WLAN communication control unit 23 to transmit the CTS frame.
- the period in which the channel is occupied in this embodiment refers to a period in which the channel is used in wireless communication according to the WPAN standard. Accordingly, the period of occupying the channel (NAV length DUR) is the same length as the super frame length SD and the active section of the WPAN standard.
- the harmonized controller 21 in this embodiment instructs the WLAN communication control unit 23 to transmit a CTS frame immediately before the WPAN communication transitions to the active section. Specifically, the harmonized controller 21 instructs the WLAN communication control unit 23 when the beacon interval BI has elapsed after instructing the WPAN communication control unit 22 to start wireless communication using the WPAN standard. Instructs to transmit a CTS frame. Alternatively, the harmonized controller 21 instructs the WLAN communication control unit 23 to transmit the CTS frame when the beacon interval BI has elapsed after instructing to transmit the CTS frame. As described above, in the WPAN standard, a beacon is transmitted every time the beacon interval BI elapses (transition to an active section).
- the NAV length DUR is controlled to the same length as the super frame length SD and the active section of the WPAN standard. Therefore, the NAV length DUR elapses at the same timing as when the WPAN communication transitions to the inactive period. That is, the WLAN communication can transition to the communication mode at the timing when the WPAN communication transitions to the inactive section.
- the harmonized controller 21 does not perform wireless communication using the WLAN standard during the wireless communication period (active period) using the WPAN standard. Can be controlled. Further, the harmonized controller 21 restricts wireless communication using the WLAN standard as described above, while performing wireless communication using the WLAN standard during a period (inactive period) in which wireless communication using the WPAN standard is not performed. It is possible to perform control.
- the radio frame instructed to be transmitted by the harmonized controller 21 is not necessarily a CTS frame.
- the WPAN communication control unit 22 has a function of performing wireless communication with the WPAN terminal 3 in accordance with the WPAN standard (first wireless communication method). As shown in FIG. 2, the WPAN communication control unit 22 includes an antenna unit, and performs wireless communication with the WPAN terminal 3 through the antenna unit. Further, the WPAN communication control unit 22 in the present embodiment performs wireless communication using the 920 MHz band.
- the superframe length SD and the beacon interval BI are notified from the harmonized controller 21 to the WPAN communication control unit 22. That is, the WPAN communication control unit 22 sets the active period and the inactive period by the harmonized controller 21. For this reason, the WPAN communication control unit 22 operates so as not to perform wireless communication in the inactive section while performing wireless communication in the active section.
- the WPAN communication control unit 22 transmits a beacon in response to an instruction from the harmonized controller 21 or every time the beacon interval BI elapses. Thereafter, the WPAN communication control unit 22 performs wireless communication with the WPAN terminal 3 in the CAP period and the CFP period which are active periods. Then, after the elapse of the active period, the transition to the inactive period occurs until the next beacon transmission timing.
- the WPAN communication control unit 22 in the present embodiment is in a communication mode in which power is consumed in the active section and wireless communication is performed, while in the inactive section, the power consumption is reduced without performing wireless communication. Transition to power mode.
- the WLAN communication control unit 23 has a function of performing wireless communication with the WLAN terminal 4 and the backhaul node 5 according to the WLAN standard (second wireless communication method). As shown in FIG. 2, the WLAN communication control unit 23 includes an antenna unit, and performs wireless communication with the WLAN terminal 4 and the backhaul node 5 via the antenna unit. In addition, the WLAN communication control unit 23 in the present embodiment performs wireless communication using the 920 MHz band.
- the WLAN communication control unit 23 is instructed to start communication or to transmit a CTS frame from the harmonized controller 21.
- the WLAN communication control unit 23 starts wireless communication according to an instruction from the harmonized controller 21 (changes to the communication mode). After that, every time the WLAN communication control unit 23 is instructed by the harmonized controller 21 to transmit a CTS frame, the WLAN communication control unit 23 transmits the CTS frame and shifts to the non-communication mode by the NAV length DUR.
- the WLAN communication control unit 23 detects the start of wireless communication according to the WPAN standard by receiving an instruction from the harmonized controller 21 to transmit a CTS frame. Also, the WLAN communication control unit 23 does not perform wireless communication based on the WLAN standard under the control of the harmonized controller 21 (by receiving an instruction to transmit a CTS frame) during the wireless communication period based on the WPAN standard. Operates on. On the other hand, the WLAN communication control unit 23 operates under the control of the harmonized controller 21 (in accordance with the NAV length DUR included in the CTS frame) to perform wireless communication based on the WLAN standard outside the wireless communication period based on the WPAN standard. .
- any access method (PCF (Point Coordination Function), DCF (Distributed Coordination Function), HCF (Hybrid Coordination Function), etc.) defined in the WLAN standard can be used.
- wireless communication may be performed using either CP or CFP.
- the WPAN terminal 3 has a function of performing wireless communication with the WPAN communication control unit 22 of the gateway 2 using the WPAN standard.
- the WPAN terminal 3 has a general function as a sensor node.
- the WPAN terminal 3 includes, for example, a wireless communication unit 31, a control unit 32, and a sensor 33.
- the configuration of the WPAN terminal 3 is not limited to the above case. As long as the WPAN terminal 3 has a function of performing communication using the WPAN standard and a function as a sensor node, the specific configuration thereof is not particularly limited.
- the wireless communication unit 31 has a function of performing wireless communication using the WPAN standard.
- the wireless communication unit 31 includes an antenna unit, and performs wireless communication with the WPAN communication control unit 22 via the antenna unit. Note that the wireless communication unit 31 in the present embodiment performs wireless communication with the WPAN communication control unit 22 using the 920 MHz band.
- the control unit 32 has a function of controlling the entire WPAN terminal 3. For example, the control unit 32 performs control when acquiring sensor data from the sensor 33, transmitting the acquired sensor data, or constructing a route. Further, the control unit 32 controls the transition to the active period and the transition to the inactive period according to the information of the superframe length SD and the beacon interval BI included in the beacon transmitted from the WPAN communication control unit 22. Do. For example, during the inactive period, the control unit 32 stops the functions of the wireless communication unit 31, the control unit 32, and the sensor 33, and controls the WPAN terminal 3 to transition to the power saving mode.
- the sensor 33 has a function of sensing predetermined data such as temperature and power value. In addition, the sensor 33 transmits sensed data (sensor data) to the control unit 32. Note that the WPAN terminal 3 may be mounted with an actuator such as a motor or a switch instead of the sensor 33.
- the wireless communication unit 31 of the WPAN terminal 3 receives a beacon transmitted from the WPAN communication control unit 22. Subsequently, the control unit 32 determines whether the active period (between the super frame length SD) and the inactive period (after the super frame length SD has elapsed) according to the information of the super frame length SD and the beacon interval BI included in the beacon. Until the beacon is transmitted). That is, the control unit 32 controls the WPAN terminal 3 so as to perform wireless communication in the active section, but not perform wireless communication in the inactive section. As a result, the WPAN terminal 3 transitions to the active period and the inactive period in synchronization with the timing when the WPAN communication control unit 22 transitions to the active period and the inactive period.
- the WLAN terminal 4 has a function of performing wireless communication with the WLAN communication control unit 23 of the gateway 2 using the WLAN standard.
- the WLAN terminal 4 has a general function as a sensor node.
- the WLAN terminal 4 includes, for example, a wireless communication unit 41, a control unit 42, and a sensor 43.
- the configuration of the WLAN terminal 4 is not limited to the above case. As long as the WLAN terminal 4 has a function of performing communication using the WLAN standard and a function as a sensor node, the specific configuration thereof is not particularly limited.
- the wireless communication unit 41 has a function of performing wireless communication using the WLAN standard.
- the wireless communication unit 41 includes an antenna unit, and performs wireless communication with the WLAN communication control unit 23 via the antenna unit. Note that the wireless communication unit 41 in this embodiment performs wireless communication with the WLAN communication control unit 23 using the 920 MHz band.
- the control unit 42 has a function of controlling the entire WLAN terminal 4. For example, the control unit 42 performs control when acquiring sensor data from the sensor 43, transmitting the acquired sensor data, or constructing a route. In addition, the control unit 42 performs control to shift the WLAN terminal 4 to the non-communication mode by the NAV length DUR included in the CTS frame transmitted from the WLAN communication control unit 23. In addition, when the NAV length DUR has elapsed, the control unit 42 performs control to cause the WLAN terminal 4 to transition to the communication mode.
- the configuration of the sensor 43 is the same as the configuration of the sensor 33 provided in the WPAN terminal 3 described above. Therefore, explanation is omitted.
- the wireless communication unit 41 of the WLAN terminal 4 receives the CTS frame transmitted from the WLAN communication control unit 23. Subsequently, the control unit 42 performs control to shift the WLAN terminal 4 to the non-communication mode by the amount of the NAV length DUR included in the CTS frame. As a result, the WLAN terminal 4 transitions to the non-communication mode in synchronization with the timing at which the WLAN communication control unit 23 transitions to the non-communication mode. Further, when the NAV length DUR has elapsed, the control unit 42 causes the WLAN terminal to transition to the communication mode. As a result, the WLAN terminal 4 transitions to the communication mode in synchronization with the timing when the WLAN communication control unit 23 transitions to the communication mode. That is, the WLAN terminal 4 is controlled not to perform wireless communication during the wireless communication period (active period) according to the WPAN standard, but to perform wireless communication outside the wireless communication period (in the inactive period) according to the WPAN standard. become.
- the backhaul node 5 is a node that relays the sensor data collected by the gateway 2 to the Internet 6. As described above, the backhaul node 5 in this embodiment performs wireless communication with the WLAN communication control unit 23 of the gateway 2 using the WLAN standard. Note that the backhaul node 5 and the gateway 2 may be connected by a wire.
- the backhaul node 5 includes a backhaul controller 51, a WLAN communication control unit 52, and an Internet communication control unit 53.
- the backhaul controller 51 has a function of controlling the WLAN communication control unit 52 and the Internet communication control unit 53.
- the backhaul controller 51 transfers the sensor data acquired by the WLAN communication control unit 52 communicating with the gateway 2 to the user via the Internet communication control unit 53 and the Internet 6, for example.
- the WLAN communication control unit 52 has a function of performing wireless communication with the WLAN communication control unit 23 of the gateway 2 using the WLAN standard. As illustrated in FIG. 6, the WLAN communication control unit 52 includes an antenna unit, and performs wireless communication with the WLAN communication control unit 23 of the gateway 2 via the antenna unit. In addition, the WLAN communication control unit 52 in the present embodiment performs wireless communication using the 920 MHz band.
- the Internet communication control unit 53 is connected to the Internet 6 by wire.
- the internet communication control unit 53 is used when communicating with the internet 6.
- the Internet communication control unit 53 is used when the sensed sensor data is transferred to the user via the Internet.
- the harmonized controller 21 notifies the WPAN communication control unit 22 of the super frame length SD and the beacon interval BI (step S002). That is, the harmonized controller 21 sets the active period and the inactive period in the WPAN communication control unit 22.
- the harmonized controller 21 instructs the WPAN communication control unit 22 to start WPAN communication (step S003).
- the harmonized controller 21 waits for the super frame length SD (t1) after instructing to start WPAN communication (step S004).
- the harmonized controller 21 instructs the WLAN communication control unit 23 to start the WLAN communication after waiting for the super frame length SD (step S005).
- the harmonized controller 21 waits for the time (t2-t1 minutes) obtained by subtracting the superframe length SD from the beacon interval BI (step S006). That is, the harmonized controller 21 waits until the beacon interval BI has elapsed from the timing at which the WPAN communication is instructed to start.
- the harmonized controller 21 instructs the WLAN communication control unit 23 to transmit a CTS frame (step S007). Thereafter, the harmonized controller 21 waits for the beacon interval BI (t2) (step S008) and then repeats the operation of instructing the WLAN communication control unit 23 to transmit a CTS frame (step S009) (step S010, ).
- the WPAN communication control unit 22 is notified of the super frame length SD and the beacon interval BI from the harmonized controller 21 (step S002). That is, the WPAN communication control unit 22 is set with the active period and the inactive period from the harmonized controller 21.
- the WPAN communication control unit 22 receives an instruction to start WPAN communication from the harmonized controller 21 (step S003). Then, the WPAN communication control unit 22 transitions to the communication mode (step S021). The WPAN communication control unit 22 that has transitioned to the communication mode transmits a beacon and performs wireless communication according to the CAP period and the CFP period.
- the WPAN communication control unit 22 has an active period and an inactive period. Therefore, the WPAN communication control unit 22 transitions to the inactive period after performing wireless communication during the active period. That is, the WPAN communication control unit 22 performs wireless communication for the super frame length SD (t1), and then transitions to the inactive period (power saving mode) (step S022). Then, the WPAN communication control unit 22 waits for the time (t2 ⁇ t1 minutes) obtained by subtracting the superframe length SD from the beacon interval BI. That is, the WPAN communication control unit 22 waits until the beacon interval BI time elapses after the previous beacon is transmitted.
- the WPAN communication control unit 22 transitions to the communication mode and transmits a beacon (step S023). Thereafter, the WPAN communication control unit 22 performs wireless communication during the super frame length SD (t1) (active period), and then transitions to the power saving mode (inactive period) (step S024). Then, the operation of waiting for the beacon interval BI-superframe length SD (t2-t1), transitioning to the communication mode again, and transmitting a beacon (step S025) is repeated (step S026,).
- the WLAN communication control unit 23 first receives a communication start instruction (step S005) from the harmonized controller 21. Then, the WLAN communication control unit 23 transitions to the communication mode (step S031). The WLAN communication control unit 23 may use either CP / CFP in the communication mode.
- the WLAN communication control unit 23 receives an instruction to transmit a CTS frame from the harmonized controller 21 (step S007). Then, the WLAN communication control unit 23 receives the instruction and transmits a CTS frame. Further, after transmitting the CTS frame, the WLAN communication control unit 23 shifts to the non-communication mode by (t1) of the NAV length DUR (step S032).
- the WLAN communication control unit 23 transitions to the communication mode after the NAV length DUR (t1) has elapsed (step S033). Thereafter, the WLAN communication control unit 23 receives an instruction to transmit a CTS frame from the harmonized controller 21 and switches to the non-communication mode after transmitting the CTS frame (step S034), and enters the communication mode after the NAV length DUR has elapsed. The transition operation (step S035) is repeated.
- the WPAN terminal 3 receives the beacon (step S021) transmitted by the WPAN communication control unit 22 (step S041).
- the beacon includes information indicating the super frame length SD and the beacon interval BI. Therefore, after receiving the beacon, the WPAN terminal 3 performs wireless communication for the super frame length SD. Thereafter, the WPAN terminal 3 transitions to an inactive section (power saving mode) (step S042).
- the WPAN terminal 3 transitions to the communication mode after the amount of subtraction of the superframe length SD from the beacon interval BI has elapsed (after the beacon interval BI has elapsed since the previous beacon was received). Then, the WPAN terminal 3 receives the beacon (step S023) transmitted by the WPAN communication control unit 22 (step S043). Thereafter, the WPAN terminal 3 performs wireless communication for the super frame length SD included in the beacon, and then transitions to the power saving mode (step S044). Thereafter, after the elapse of the amount obtained by subtracting the superframe length SD from the beacon interval BI, the WPAN terminal 3 repeats the operation of transitioning to the communication mode and receiving a beacon (step S045) (step S046,).
- the WLAN terminal 4 receives the CTS frame (step S032) transmitted by the WLAN communication control unit 23. Then, the WLAN terminal 4 shifts to the non-communication mode by the NAV length DUR included in the CTS frame (step S051).
- the WLAN terminal 4 transitions to the communication mode after the NAV length DUR has elapsed (step S052). Thereafter, when receiving the CTS frame transmitted by the WLAN communication control unit 23, the WLAN terminal 4 transitions to the non-communication mode (step S053). Then, the WLAN terminal 4 repeats the operation of transitioning to the communication mode after the NAV length DUR has elapsed (step S054).
- the gateway 2 includes the harmonized controller 21, the WPAN communication control unit 22, and the WLAN communication control unit 23.
- the harmonized controller 21 can set an active period and an inactive period for the WPAN communication control unit 22 (can set a superframe length SD and a beacon interval BI).
- the harmonized controller 21 transmits a CTS frame including a NAV length DUR having a length equal to the active period to the WLAN communication control unit 23 immediately before the WPAN communication control unit 22 transitions to the active period. Can be instructed.
- the harmonized controller 21 performs control so that wireless communication based on the WLAN standard is not performed during the wireless communication period based on the WPAN standard, while performing wireless communication based on the WLAN standard outside the wireless communication period based on the WPAN standard. Can be controlled.
- FIG. 10 shows an example of the wireless communication based on the WPAN standard and the wireless communication based on the WPAN standard performed under the control of the harmonized controller 21 described above.
- wireless communication according to the WPAN standard includes an active period (communication mode, superframe length SD) including a beacon, a CAP period, and a CFP period, and an inactive period (power saving) in which no wireless communication is performed. Mode).
- the wireless communication based on the WLAN standard is performed while the wireless communication based on the WPAN standard is in the inactive period.
- the CTS frame is transmitted immediately before the wireless communication based on the WPAN standard shifts to the active section, so that the wireless communication based on the WLAN standard shifts to the non-communication mode while the wireless communication based on the WPAN standard is in the active section.
- the beacon includes information related to the super frame length SD and the beacon interval BI has been described.
- the present invention can be implemented without being limited to the above case.
- the harmonized controller 21 instructs the WPAN communication control unit 22 to transmit a wakeup signal, for example, when issuing an instruction to transmit the CTS frame to the WLAN communication control unit 23. Will do.
- the WPAN terminal 3 can receive a wakeup signal.
- the CFP period in the superframe length SD of the WPAN standard is a period that can be used for irregularly generated high priority communication such as emergency data transmission (fire alarm, etc.). Therefore, when there is no emergency data transmission, the CFP period can be used for WLAN communication without being used for WPAN communication.
- the harmonized controller 21 sets a super frame composed of a beacon and a CAP period.
- the configuration of the superframe set by the harmonized controller 21 does not necessarily have to be composed of a beacon, a CAP period, and a CFP period.
- the WPAN standard inactive period is longer for the CFP period, while the WLAN standard communication mode period is longer.
- the harmonized controller 21 may be controlled so as to lengthen the time during which the WLAN standard is in the communication mode by not setting the CFP period in the active period of the WPAN standard.
- the present invention can be implemented without being limited to use in a wireless sensor network.
- the present invention can be applied to a wide-area security system based on position information.
- the present invention may be applied to an agricultural IT system that controls crops in an arbitrary environment (temperature, humidity, amount of sunlight, etc.) in agriculture, for example.
- the present invention may be applied to a general wireless communication system other than a wireless sensor network, for example, applied to an environment where wireless LAN communication and wireless PAN communication coexist.
- the embodiment of the present invention may use a band other than the 920 MHz band.
- the gateway 2 has a function of performing both control for the WPAN standard and control for the WLAN standard.
- the implementation of the present invention is not limited to the above case.
- the present invention can also be implemented by having two nodes, a node that controls the WPAN standard and a node that controls the WLAN standard.
- the backhaul node is a WLAN AP (Access Point) and the gateway is an STA (Station).
- the basic configuration is the same as that of the first embodiment. Therefore, in the following, a characteristic part of this embodiment will be described.
- the wireless sensor network 7 in the present embodiment includes a gateway 9, a WPAN terminal 3, a WLAN terminal 4, and a backhaul node 8.
- the number of gateways 9 included in the wireless sensor network 7 is not limited to one.
- the wireless sensor network 7 may have one gateway 9 or may have many gateways 9.
- symbol shall be attached
- characteristic parts in the present embodiment will be described.
- the backhaul node 8 in this embodiment is an access point in the WLAN standard. That is, the backhaul node 8 has a function of controlling wireless communication using the WLAN standard.
- the backhaul node 8 includes a backhaul controller 81, a WLAN communication control unit 82, and an Internet communication control unit 53.
- the configuration of the Internet communication control unit 53 is the same as that already described. Therefore, the characteristic parts of the backhaul controller 81 and the WLAN communication control unit 82 will be described below.
- the backhaul controller 81 in the present embodiment has a function of synchronizing the timings of the harmonized controller 91 and the backhaul controller 81 of the gateway 9 described later by communicating with the gateway 9.
- the backhaul controller 81 has a function of determining and managing the super frame length SD, the beacon interval BI, and the NAV length DUR. Further, the backhaul controller 81 is configured to give instructions to the WLAN communication control unit 82 of the backhaul node 8 and the WPAN communication control unit 83 of the gateway 9 at appropriate timing.
- the roles of the backhaul controller 81 in this embodiment are listed as follows, for example. ⁇ Management of WPAN SD and BI, and notification to harmonized controller 91 ⁇ Synchronization of beacon transmission timing of WPAN and harmonized controller 91 of gateway 9 ⁇ Management of NAM length DUR of WLAM ⁇ CTS transmission timing of WLAN Instruction / Management of WLAN Communication Start As described above, the backhaul controller 81 in this embodiment instructs the WLAN communication control unit 82 to transmit a CTS frame or instructs the WLAN communication start. That is, the backhaul controller 81 can manage the WLAN standard. The management of the WPAN standard is performed via the gateway 9.
- the WLAN communication control unit 82 has a function of performing wireless communication with the WLAN terminal 4 and the gateway 9 in accordance with the WLAN standard. As illustrated in FIG. 13, the WLAN communication control unit 82 includes an antenna unit, and performs wireless communication with the WLAN terminal 4 and the gateway 9 via the antenna unit. In addition, the WLAN communication control unit 82 in the present embodiment performs wireless communication using the 920 MHz band. The WLAN communication control unit 82 transmits a CTS frame or starts wireless communication based on the WLAN standard in accordance with an instruction from the backhaul controller 81.
- the gateway 9 in this embodiment is a coordinator in the WPAN standard. That is, the gateway 9 has a function of controlling wireless communication using the WPAN standard.
- the gateway 9 in the present embodiment has a harmonized controller 91, a WPAN communication control unit 22, and a WLAN communication control unit 23.
- the configurations of the WPAN communication control unit 22 and the WLAN communication control unit 23 are the same as those already described. Therefore, the characteristic part of the harmonized controller 91 will be described below.
- the harmonized controller 91 in the present embodiment has a function of controlling the WPAN communication control unit 22 in synchronization with a timing instruction from the backhaul node 8 (backhaul controller 81).
- the roles of the harmonized controller 91 in the present embodiment are listed as follows, for example. -WPAN SD and BI management-WPAN beacon transmission timing instruction-Transfer of collected WPAN / WLAN communication data to the backhaul node 8
- the harmonized controller 91 in this embodiment is a WPAN communication control unit. 22 instruct the beacon transmission timing.
- the harmonized controller 91 acquires and manages the superframe length SD and the beacon interval BI determined by the backhaul controller 81. That is, the harmonized controller 91 can manage the WPAN standard. As described above, management of the WLAN standard is performed via the backhaul node 8.
- the wireless sensor network 7 in the present embodiment includes the backhaul node 8 including the backhaul controller 81 and the gateway 9 including the harmonized controller 91. Further, the backhaul controller 81 can manage the WLAN standard. The harmonized controller 91 can manage the WPAN standard.
- control is performed so that wireless communication based on the WLAN standard is not performed during the wireless communication period based on the WPAN standard, while control is performed so that wireless communication based on the WLAN standard is performed outside the wireless communication period based on the WPAN standard. I can do it.
- management of WPAN and WLAN is not realized on the same node, but can be realized on two separate nodes, for example, a gateway and a backhaul node.
- the wireless communication control device 10 includes a first communication method control unit 101 and a second communication method control unit 102.
- the first communication system control unit 101 can perform wireless communication using the first wireless communication system.
- the second communication system control unit 102 can perform wireless communication using the second wireless communication system.
- the second communication system control unit 102 has a function of detecting the start of wireless communication using the first wireless communication system.
- the second wireless communication method control unit 102 detects the start of wireless communication by the first wireless communication method (by the first communication method control unit 101)
- the second wireless communication method control unit 102 performs the second wireless communication during the wireless communication period using the first wireless communication method. It operates so as not to perform wireless communication by the communication method.
- the second communication system control unit 102 operates so as to perform wireless communication using the second wireless communication system outside the wireless communication period using the first wireless communication system.
- the wireless communication control device 10 avoids performing wireless communication using the second wireless communication method during the wireless communication period using the first wireless communication method, while maintaining the wireless communication period using the first wireless communication method.
- Wireless communication by the second wireless communication method can be performed outside.
- first wireless communication system and second wireless communication system are used at the same time, it is possible to effectively prevent interference between the plurality of wireless communication systems.
- a program according to another aspect of the present invention provides a wireless communication control device with a first communication method control unit that performs wireless communication using a first wireless communication method and wireless communication using a second wireless communication method.
- a second communication method control unit that performs the second communication method control unit, wherein the second communication method control unit detects the start of wireless communication by the first wireless communication method and performs second during the wireless communication period by the first wireless communication method.
- the program operates so as not to perform wireless communication according to the wireless communication method, and operates to perform wireless communication according to the second wireless communication method outside the wireless communication period according to the first wireless communication method.
- the wireless communication method executed by the operation of the above-described wireless communication control apparatus 10 detects the start of wireless communication by the first wireless communication method, and the first is during the wireless communication period by the first wireless communication method.
- the second wireless communication method is controlled not to perform wireless communication, and the second wireless communication method is controlled to perform wireless communication outside the wireless communication period of the first wireless communication method.
- the present invention can be implemented without being limited to the above case.
- the present invention may be, for example, a wireless communication control system including two nodes, a node having a function as the first communication method control unit 101 and a node having a function as the second communication method control unit 102. .
- Even the invention of the program, the wireless communication method, or the wireless communication control system having the above-described configuration has the same object as that of the above-described invention in order to have the same operation as the wireless communication control device 10 described above. Can be achieved.
- a program for realizing all or part of the functions of the first to third embodiments described above is recorded on a computer-readable recording medium, and the program recorded on the recording medium is stored in a computer system.
- the processing of each unit may be performed by reading and executing.
- An example of a “computer system” is a CPU (Central Processing Unit).
- Computer-readable recording medium is, for example, a non-transitory storage device.
- non-temporary storage devices include a magneto-optical disk, a ROM (Read Only Memory), a portable medium such as a nonvolatile semiconductor memory, and a hard disk built in a computer system.
- the “computer-readable recording medium” may be a temporary storage device.
- a temporary storage device for example, a communication line in the case of transmitting a program via a network such as the Internet or a communication line such as a telephone line, or a volatile memory inside a computer system can be cited.
- the program may be for realizing a part of the above-described functions, and may be capable of realizing the above-described functions in combination with a program already recorded in the computer system. .
- Appendix 1 A first communication method control unit for performing wireless communication by the first wireless communication method; A second communication method control unit for performing wireless communication by the second wireless communication method; With The second communication method control unit detects the start of wireless communication by the first wireless communication method, and performs wireless communication by the second wireless communication method during a wireless communication period by the first wireless communication method. Operating to perform wireless communication according to the second wireless communication method outside the wireless communication period according to the first wireless communication method, Wireless communication control device.
- the wireless communication control device includes the first communication method control unit and the second communication method control unit.
- the second communication system control unit detects the start of wireless communication using the first wireless communication system, and does not perform wireless communication using the second wireless communication system during the wireless communication period using the first wireless communication system. It is configured to operate.
- the second communication system control unit is configured to operate so as to perform wireless communication using the second wireless communication system outside the wireless communication period using the first wireless communication system.
- Communication using the first wireless method and communication using the second wireless method can be controlled so as to perform wireless communication using the second wireless communication method.
- the wireless communication control device according to attachment 1, wherein The first communication method control unit is configured to set an active period that is a period of performing wireless communication and an inactive period that is a period of not performing wireless communication, and to operate according to the set period,
- the second communication method control unit detects the start of the activity period of the first communication method control unit, and operates so as not to perform wireless communication by the second wireless communication method during the activity period; Operating to perform wireless communication according to the second wireless communication system during an inactive period; Wireless communication control device.
- the wireless communication control device (Appendix 6) The wireless communication control device according to attachment 5, wherein The control means is configured to specify at least a beacon transmission period and a contention access period that does not limit a wireless communication terminal that performs wireless communication using the first wireless communication method, as the activity period, Wireless communication control device. (Appendix 7) The wireless communication control device according to appendix 5 or 6, The first wireless communication method is a WPAN (Wireless Personal Area Network) standard, and the second wireless communication method is a WLAN (Wireless Local Area Network) standard, The control means is configured to set the active period and the inactive period by setting a superframe length and a beacon interval for the first communication scheme control unit, Wireless communication control device.
- WPAN Wireless Personal Area Network
- WLAN Wireless Local Area Network
- the wireless communication control device according to any one of appendices 3 to 7,
- the wireless communication signal including information indicating the activity period of the first communication method control unit is a CTS (Clear To Send) signal.
- Wireless communication control device (Appendix 9)
- the wireless communication control unit according to any one of appendices 1 to 8,
- the first wireless communication system is a WPAN (Wireless Personal Area Network) standard
- the second wireless communication system is a WLAN (Wireless Local Area Network) standard.
- Wireless communication control device is a Wi-Fi
- the second communication method control unit detects the start of wireless communication by the first wireless communication method, and does not perform wireless communication by the second wireless communication method during the wireless communication period by the first wireless communication method.
- the wireless communication control method according to appendix 10, wherein The first communication method control unit is set with an active period that is a period for performing wireless communication and an inactive period that is a period for not performing wireless communication, and operates according to the set period, The second communication method control unit detects the start of the activity period of the first communication method control unit, and operates so as not to perform wireless communication by the second wireless communication method during the activity period; Operating to perform wireless communication according to the second wireless communication system during an inactive period; Wireless communication control method.
- (Appendix 12) Wireless communication for controlling wireless communication by a wireless communication method using a first communication method control unit that performs wireless communication by a first wireless communication method and a second communication method control unit that performs wireless communication by a second wireless communication method
- the second communication method control unit detects the start of wireless communication by the first wireless communication method, and performs wireless communication by the second wireless communication method during the wireless communication period by the first wireless communication method.
- a storage medium storing a program for executing a process of operating to perform wireless communication according to the second wireless communication method outside the wireless communication period according to the first wireless communication method.
- a storage medium comprising: a process for operating to perform wireless communication by the second wireless communication method during the inactive period outside the active period.
- a first communication system control device for performing wireless communication by the first wireless communication system; A second communication system control device for performing wireless communication by the second wireless communication system; With The second communication method control device detects the start of wireless communication by the first wireless communication method, and performs wireless communication by the second wireless communication method during a wireless communication period by the first wireless communication method. Operating to perform wireless communication according to the second wireless communication method outside the wireless communication period according to the first wireless communication method, Wireless communication control system.
- the wireless communication control system according to appendix 14,
- the first communication method control unit is configured to set an active period that is a period of performing wireless communication and an inactive period that is a period of not performing wireless communication, and to operate according to the set period,
- the second communication method control unit detects the start of the activity period of the first communication method control unit, and operates so as not to perform wireless communication by the second wireless communication method during the activity period; Operative to perform wireless communication by the second wireless communication method during the inactive period outside the active period; Wireless communication control system.
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Abstract
Description
[第1の実施形態]
図1は、本発明の第1の実施形態に係る無線センサーネットワーク1(WSN、Wireless Sensor Networks)の構成例を示す図である。無線センサーネットワーク1は、920MHz帯を使用して無線通信を行う無線センサーネットワークである。具体的には、無線センサーネットワーク1において、920MHz帯を使用して、WPAN規格に基づく無線通信とWLAN規格に基づく無線通信とが行われている。
・WPANのSD、BIの管理
・WPANのビーコン送出タイミングの指示(WPANの通信開始の指示)
・WLANのNAV長の管理
・WLANのCTS送信タイミングの指示
・WLANの通信開始の指示
・収集したWPAN/WLAN通信データのバックホールノード5への転送
図3Aは、WPAN規格にて無線通信を行う際に用いるパラメータを説明するための図である。図3Bは、WLAN規格にて無線通信を行う際に用いるパラメータを説明するための図である。
WPAN端末3は、WPAN規格を用いて通信を行う機能とセンサノードとしての機能とを備えていれば、その具体的な構成は特に限定しなくても構わない。
[第2の実施形態]
次に本発明の第2の実施形態について図面を参照して説明する。第2の実施形態では、バックホールノードがWLAN AP(Access Point)となり、ゲートウェイがSTA(Station)となる場合について説明する。なお、基本的な構成は第1の実施形態と同様になる。そのため、以下においては、本実施形態に特徴的な部分について説明する。
・WPANのSD、BIの管理、およびハーモナイズドコントローラ91への通知
・WPANのビーコン送出タイミングとゲートウェイ9のハーモナイズドコントローラ91との同期
・WLAMのNAV長DURの管理
・WLANのCTS送出のタイミングの指示
・WLANの通信開始の管理
このように、本実施形態におけるバックホールコントローラ81は、WLAN通信制御部82に対してCTSフレームの送信を指示したり、WLANの通信開始を指示したりする。つまり、バックホールコントローラ81は、WLAN規格の管理を行うことが出来る。なお、WPAN規格の管理はゲートウェイ9を介して行われることになる。
・WPANのSD、BIの管理
・WPANのビーコン送出タイミングの指示
・収集したWPAN/WLAN通信データのバックホールノード8への転送
このように、本実施形態におけるハーモナイズドコントローラ91は、WPAN通信制御部22に対してビーコン送出タイミングを指示する。また、ハーモナイズドコントローラ91は、バックホールコントローラ81が決定したスーパーフレーム長SDとビーコン間隔BIとを取得して管理する。つまり、ハーモナイズドコントローラ91は、WPAN規格の管理を行うことが出来る。なお、上述したように、WLAN規格の管理はバックホールノード8を介して行われる。
[第3の実施形態]
次に本発明の第3の実施形態について図面を参照して説明する。
上記実施形態の一部又は全部は、以下の付記のようにも記載されうる。
(付記1)
第1の無線通信方式による無線通信を行う第1通信方式制御部と、
第2の無線通信方式による無線通信を行う第2通信方式制御部と、
を備え、
前記第2通信方式制御部は、前記第1の無線通信方式による無線通信の開始を検出し、前記第1の無線通信方式による無線通信期間中は前記第2の無線通信方式による無線通信を行わないように作動し、前記第1の無線通信方式による無線通信期間外に前記第2の無線通信方式による無線通信を行うように作動する、
無線通信制御装置。
(付記2)
付記1に記載の無線通信制御装置であって、
前記第1通信方式制御部は、無線通信を行う期間である活動期間と無線通信を行わない期間である非活動期間とを設定され、当該設定された期間に従って作動するよう構成され、
前記第2通信方式制御部は、前記第1通信方式制御部の前記活動期間の開始を検出し、前記活動期間中は前記第2の無線通信方式による無線通信を行わないように作動し、前記非活動期間に前記第2の無線通信方式による無線通信を行うように作動する、
無線通信制御装置。
(付記3)
付記2に記載の無線通信制御装置であって、
前記第2通信方式制御部は、前記第1通信方式制御部の前記活動期間の開始及び長さを検出し、当該検出した前記活動期間の長さに応じた前記活動期間中は前記第2の無線通信方式による無線通信を行わないように作動する、
無線通信制御装置。
(付記4)
付記3に記載の無線通信制御装置であって、
前記第1通信方式制御部と前記第2通信方式制御部との動作を制御する制御手段を備え、
前記制御手段は、前記第1通信方式制御部が前記活動期間に遷移する直前に前記第2通信方式制御部に対して前記活動期間を表す情報を含む無線通信信号を送信するよう指示し、
前記第2通信方式制御部は、前記指示を受けることで前記活動期間の開始及び長さを検出し、前記指示に応じて前記活動期間を表す情報を含む無線通信信号を外部に送信した後、前記活動期間中は前記第2の無線通信方式による無線通信を行わないように作動する、
無線通信制御装置。
(付記5)
付記4に記載の無線通信制御装置であって、
前記制御手段は、前記第1通信方式制御部の前記活動期間と前記非活動期間を設定するよう構成された、
無線通信制御装置。
(付記6)
付記5に記載の無線通信制御装置であって、
前記制御手段は、前記活動期間として、ビーコン送信期間と前記第1の無線通信方式を用いて無線通信を行う無線通信端末を制限しないコンテンションアクセス期間とを少なくとも指定するよう構成された、
無線通信制御装置。
(付記7)
付記5又は6に記載の無線通信制御装置であって、
前記第1の無線通信方式はWPAN(Wireless Personal Area Network)規格であり、前記第2の無線通信方式はWLAN(Wireless Local Area Network)規格であり、
前記制御手段は、前記第1通信方式制御部に対してスーパーフレーム長とビーコン間隔とを設定することで、前記活動期間と前記非活動期間を設定するよう構成された、
無線通信制御装置。
(付記8)
付記3乃至7の何れかに記載の無線通信制御装置であって、
前記第1通信方式制御部の活動期間を表す情報を含む無線通信信号はCTS(Clear To Send)信号である、
無線通信制御装置。
(付記9)
付記1乃至8の何れかに記載の無線通信制御部であって、
前記第1の無線通信方式はWPAN(Wireless Personal Area Network)規格であり、前記第2の無線通信方式はWLAN(Wireless Local Area Network)規格である、
無線通信制御装置。
(付記10)
第1の無線通信方式による無線通信を行う第1通信方式制御部と第2の無線通信方式による無線通信を行う第2通信方式制御部とを用いて複数の無線通信方式による無線通信を制御する方法であって、
前記第2通信方式制御部は、第1の無線通信方式による無線通信の開始を検出し、前記第1の無線通信方式による無線通信期間中は第2の無線通信方式による無線通信を行わないよう制御し、前記第1の無線通信方式による無線通信期間外に前記第2の無線通信方式による無線通信を行うよう制御する、
無線通信制御方法。
(付記11)
付記10に記載の無線通信制御方法であって、
前記第1通信方式制御部は、無線通信を行う期間である活動期間と無線通信を行わない期間である非活動期間とを設定され、当該設定された期間に従って作動し、
前記第2通信方式制御部は、前記第1通信方式制御部の前記活動期間の開始を検出し、前記活動期間中は前記第2の無線通信方式による無線通信を行わないように作動し、前記非活動期間に前記第2の無線通信方式による無線通信を行うように作動する、
無線通信制御方法。
(付記12)
第1の無線通信方式による無線通信を行う第1通信方式制御部と、第2の無線通信方式による無線通信を行う第2通信方式制御部を用いて無線通信方式による無線通信を制御する無線通信制御装置のコンピュータに、
前記第2通信方式制御部に、前記第1の無線通信方式による無線通信の開始を検出させ、前記第1の無線通信方式による無線通信期間中は前記第2の無線通信方式による無線通信を行わないように作動させ、前記第1の無線通信方式による無線通信期間外に前記第2の無線通信方式による無線通信を行うように作動させる処理
を実行させるためのプログラムを記憶する記憶媒体。
(付記13)
付記12に記載の記憶媒体であって、
前記プログラムが、
前記第1通信方式制御部に、無線通信を行う期間である活動期間と無線通信を行わない期間である非活動期間とを設定させ、当該設定された期間に従って作動させ、
前記第2通信方式制御部に、前記第1通信方式制御部の前記活動期間の開始を検出させ、前記活動期間中は前記第2の無線通信方式による無線通信を行わないように作動させ、前記活動期間外である前記非活動期間に前記第2の無線通信方式による無線通信を行うように作動させる処理
を含む記憶媒体。
(付記14)
第1の無線通信方式による無線通信を行う第1通信方式制御装置と、
第2の無線通信方式による無線通信を行う第2通信方式制御装置と、
を備え、
前記第2通信方式制御装置は、前記第1の無線通信方式による無線通信の開始を検出し、前記第1の無線通信方式による無線通信期間中は前記第2の無線通信方式による無線通信を行わないように作動し、前記第1の無線通信方式による無線通信期間外に前記第2の無線通信方式による無線通信を行うように作動する、
無線通信制御システム。
(付記15)
付記14に記載の無線通信制御システムであって、
前記第1通信方式制御部は、無線通信を行う期間である活動期間と無線通信を行わない期間である非活動期間とを設定され、当該設定された期間に従って作動するよう構成され、
前記第2通信方式制御部は、前記第1通信方式制御部の前記活動期間の開始を検出し、前記活動期間中は前記第2の無線通信方式による無線通信を行わないように作動し、前記活動期間外である前記非活動期間に前記第2の無線通信方式による無線通信を行うように作動する、
無線通信制御システム。
2、9 ゲートウェイ
21、91 ハーモナイズドコントローラ
22 WPAN通信制御部
23 WLAN通信制御部
3 WPAN端末
31 無線通信部
32 制御部
33 センサー
4 WLAN端末
41 無線通信部
42 制御部
43 センサー
5、8 バックホールノード
51、81 バックホールコントローラ
52、82 WLAN通信制御部
53 インターネット通信制御部
6 インターネット
10 無線通信制御装置
101 第1通信方式制御部
102 第2通信方式制御部
Claims (10)
- 第1の無線通信方式による無線通信を行う第1通信方式制御手段と、
第2の無線通信方式による無線通信を行う第2通信方式制御手段と、
を備え、
前記第2通信方式制御手段は、前記第1の無線通信方式による無線通信の開始を検出し、前記第1の無線通信方式による無線通信期間中は前記第2の無線通信方式による無線通信を行わないように作動し、前記第1の無線通信方式による無線通信期間外に前記第2の無線通信方式による無線通信を行うように作動する、
無線通信制御装置。 - 請求項1に記載の無線通信制御装置であって、
前記第1通信方式制御手段は、無線通信を行う期間である活動期間と無線通信を行わない期間である非活動期間とを設定され、当該設定された期間に従って作動するよう構成され、
前記第2通信方式制御手段は、前記第1通信方式制御手段の前記活動期間の開始を検出し、前記活動期間中は前記第2の無線通信方式による無線通信を行わないように作動し、前記非活動期間に前記第2の無線通信方式による無線通信を行うように作動する、
無線通信制御装置。 - 請求項2に記載の無線通信制御装置であって、
前記第2通信方式制御手段は、前記第1通信方式制御手段の前記活動期間の開始及び長さを検出し、当該検出した前記活動期間の長さに応じた前記活動期間中は前記第2の無線通信方式による無線通信を行わないように作動する、
無線通信制御装置。 - 請求項3に記載の無線通信制御装置であって、
前記第1通信方式制御手段と前記第2通信方式制御手段との動作を制御する制御手段を備え、
前記制御手段は、前記第1通信方式制御手段が前記活動期間に遷移する直前に前記第2通信方式制御手段に対して前記活動期間を表す情報を含む無線通信信号を送信するよう指示し、
前記第2通信方式制御手段は、前記指示を受けることで前記活動期間の開始及び長さを検出し、前記指示に応じて前記活動期間を表す情報を含む無線通信信号を外部に送信した後、前記活動期間中は前記第2の無線通信方式による無線通信を行わないように作動する、
無線通信制御装置。 - 請求項4に記載の無線通信制御装置であって、
前記制御手段は、前記第1通信方式制御手段の前記活動期間と前記非活動期間を設定するよう構成された、
無線通信制御装置。 - 請求項5に記載の無線通信制御装置であって、
前記制御手段は、前記活動期間として、ビーコン送信期間と前記第1の無線通信方式を用いて無線通信を行う無線通信端末を制限しないコンテンションアクセス期間とを少なくとも指定するよう構成された、
無線通信制御装置。 - 第1の無線通信方式による無線通信を行う第1通信方式制御部と第2の無線通信方式による無線通信を行う第2通信方式制御部とを用いて複数の無線通信方式による無線通信を制御する方法であって、
前記第2通信方式制御部は、第1の無線通信方式による無線通信の開始を検出し、前記第1の無線通信方式による無線通信期間中は第2の無線通信方式による無線通信を行わないよう制御し、前記第1の無線通信方式による無線通信期間外に前記第2の無線通信方式による無線通信を行うよう制御する、
無線通信制御方法。 - 請求項7に記載の無線通信制御方法であって、
前記第1通信方式制御部は、無線通信を行う期間である活動期間と無線通信を行わない期間である非活動期間とを設定され、当該設定された期間に従って作動し、
前記第2通信方式制御部は、前記第1通信方式制御部の前記活動期間の開始を検出し、前記活動期間中は前記第2の無線通信方式による無線通信を行わないように作動し、前記非活動期間に前記第2の無線通信方式による無線通信を行うように作動する、
無線通信制御方法。 - 第1の無線通信方式による無線通信を行う第1通信方式制御部と第2の無線通信方式による無線通信を行う第2通信方式制御部とを用いて複数の無線通信方式による無線通信を制御する無線通信制御装置のコンピュータに、
前記第2通信方式制御部に、前記第1の無線通信方式による無線通信の開始を検出させ、前記第1の無線通信方式による無線通信期間中は前記第2の無線通信方式による無線通信を行わないように作動させ、前記第1の無線通信方式による無線通信期間外に前記第2の無線通信方式による無線通信を行うように作動させる処理
を実行させるためのプログラムを記憶する記憶媒体。 - 第1の無線通信方式による無線通信を行う第1通信方式制御装置と、
第2の無線通信方式による無線通信を行う第2通信方式制御装置と、
を備え、
前記第2通信方式制御装置は、前記第1の無線通信方式による無線通信の開始を検出し、前記第1の無線通信方式による無線通信期間中は前記第2の無線通信方式による無線通信を行わないように作動し、前記第1の無線通信方式による無線通信期間外に前記第2の無線通信方式による無線通信を行うように作動する、
無線通信制御システム。
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