WO2013133191A1 - 通信システム及びその輻輳回避方法、並びにこの通信システムを用いた検針システム - Google Patents
通信システム及びその輻輳回避方法、並びにこの通信システムを用いた検針システム Download PDFInfo
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- WO2013133191A1 WO2013133191A1 PCT/JP2013/055783 JP2013055783W WO2013133191A1 WO 2013133191 A1 WO2013133191 A1 WO 2013133191A1 JP 2013055783 W JP2013055783 W JP 2013055783W WO 2013133191 A1 WO2013133191 A1 WO 2013133191A1
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- wireless
- station
- master station
- wireless slave
- wireless master
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/12—Avoiding congestion; Recovering from congestion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D4/00—Tariff metering apparatus
- G01D4/002—Remote reading of utility meters
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
- H04W84/22—Self-organising networks, e.g. ad-hoc networks or sensor networks with access to wired networks
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/30—Smart metering, e.g. specially adapted for remote reading
Definitions
- the present invention provides a communication system in which a plurality of wireless slave stations perform wireless communication with a wireless master station directly or via another wireless slave station, and communicate from the wireless master station to a collection control device by means such as wired communication.
- the present invention also relates to a congestion avoiding method, and a meter reading system using the communication system.
- Patent Document 1 There is known a telemetering system that performs meter reading of a measuring instrument that measures the amount of power, water, gas, etc. used via a communication network (for example, Patent Document 1).
- the communication terminal station which is a wireless slave station, automatically registers the identification information (CSID; Cell Station ID) of the relay station, which is the wireless master station.
- CID Cell Station ID
- the occurrence of errors related to the installation work of communication terminals is also reduced.
- the number of wireless slave stations connected to a specific wireless master station increases, wireless traffic around the wireless master station increases and communication quality deteriorates.
- the threshold for example, when the wireless master station is connected to the optical network, a plurality of wireless master stations are stopped simultaneously due to a failure of the optical network, etc.
- the existing radio slave stations bypass these radio master stations that are in a stopped state, so that connections to specific radio master stations are concentrated, and the threshold of the number of radio master stations accommodated is set. There is a risk of exceeding.
- the collection control apparatus accommodates the wireless slave stations that have transmitted connection requests in the order of arrival, and the wireless slave stations store information on two wireless master stations that can be registered.
- the collection control device it is not realistic for the collection control device to process the wireless master station information held by the wireless slave station in real time, and it is difficult to determine whether the wireless slave station can select another wireless master station as a connection destination. is there. Therefore, depending on the situation such as the arrangement of the wireless slave stations and the order in which they are newly installed, a wireless slave station that can select another wireless master station is connected to a specific wireless master station first, and only the relevant wireless master station is selected. Since a wireless slave station that cannot be connected to the wireless master station cannot connect to any of the wireless master stations, a state in which accommodation efficiency is poor such that no wireless slave station can be connected occurs.
- the wireless slave station cannot start communication. That is, all functions provided by the system are stopped for the wireless slave station that has newly transmitted a connection request after exceeding the prescribed number of registered units. As a result, low-traffic communication such as infrequent regular communication and irregular downlink communication is also stopped in a batch, which is inefficient.
- the present invention has been made in view of the circumstances as described above, and an object of the present invention is to improve the accommodation efficiency of the wireless slave station in the wireless master station and to efficiently use the communication system while suppressing traffic.
- An object of the present invention is to provide a congestion avoiding method and a meter reading system using the communication system.
- a communication system is configured such that a plurality of wireless slave stations perform wireless communication with a wireless master station directly or via another wireless slave station, and collection control is performed via the wireless master station.
- the collection control device includes a first storage unit that manages the number of radio slave stations accommodated in each radio master station, and a radio slave station accommodated in the radio master station.
- Second storage means for storing first to fourth threshold values for determining the number of accommodated units, and when receiving a connection request from a wireless slave station to a specific wireless master station, When the number of wireless slave station connections reaches or exceeds the first threshold value, a notification of connection inhibition is advertised to surrounding wireless slave stations via the wireless master station, and the second threshold value is higher than the first threshold value. If the frequency reaches less than the third threshold, frequent specific communication with the wireless slave station When a stop notification is transmitted and reaches a third threshold value higher than the second threshold value, an accommodation refusal notification is transmitted to the wireless slave station, and the first threshold value is transmitted after the connection inhibition notification is advertised.
- Is configured to advertise a connection suppression release notification to surrounding wireless slave stations via the wireless master station when the threshold value is lower than a fourth threshold value equal to or lower than the first threshold value. It is characterized by that.
- the wireless slave station whose connection destination is undetermined that has received the connection suppression notification transmitted from the collection control device transmits a connection request to the specific wireless master station when another wireless master station cannot be selected,
- a connection request is transmitted to the other radio master station, and the radio slave station that has received the high-frequency specific communication stop notification stops the high-frequency specific communication, and the low frequency
- the specific communication and the response to the downlink communication from the collection control device are continuously performed, and the wireless slave station that has received the accommodation refusal notification stops the low-frequency specific communication and transmits the downlink communication from the collection control device.
- a response to the communication is continuously performed, and the wireless slave station that has received the connection suppression release notification releases the restriction on transmission of the connection request to the wireless master station.
- first and second storage means are rewritable, respectively.
- each of the plurality of wireless slave stations includes third storage means for storing identification information of the accommodated wireless master station, and path construction information periodically transmitted from the wireless master station is accommodated.
- the identification information of the wireless master station is written based on the wireless master station status information supplied from the collection control device via the wireless master station.
- a plurality of wireless slave stations perform wireless communication with the wireless master station directly or via other wireless slave stations, and communicate with the collection control device via the wireless master station.
- the congestion avoiding method of the communication system to be performed when a connection request from a wireless slave station to a specific wireless master station is received, the number of wireless slave station connections under the wireless master station reaches a first threshold or more A step of advertising a connection suppression notification from the collection control device to the surrounding wireless slave stations via the wireless master station, and a wireless slave station to which the connection destination that has received the connection suppression notification is undetermined
- a master station cannot be selected, a connection request is transmitted to the radio master station, and when another radio master station can be selected, a connection request is transmitted to another radio master station;
- a connection request to the master station is received, When the number of connected wireless slave stations under the wireless master station reaches a second threshold value that is higher than the first threshold value and less than a third threshold value, the collection control device applies a high
- the response to the downlink communication from the control device is continuously performed, and the number of wireless slave stations accommodated under a specific wireless master station is equal to the first threshold after the advertisement of the connection suppression notification, or the first Advertising a connection suppression release notification from the collection control device to surrounding wireless slave stations via the wireless master station when the threshold value is lower than a fourth threshold value lower than the threshold value of 1, and the connection suppression release notification
- the meter-reading system of the present invention includes a plurality of measurement devices, a wireless slave station that is provided in each of these measurement devices and wirelessly transmits measurement values, and a wireless master station that accommodates the plurality of wireless slave stations.
- a collection control device that collects measurement values and controls the plurality of wireless slave stations selectively via the plurality of wireless master stations, and the plurality of wireless slave stations directly or other than the wireless master station
- the collection control device includes the number of wireless slave stations accommodated in each wireless master station And a second storage means for storing first to fourth threshold values for determining the number of radio slave stations accommodated in the radio master station, and from the radio slave station
- the wireless master station When a connection request to a wireless master station is received, the wireless master station When the number of wireless slave station connections reaches or exceeds the first threshold value, a notification of connection inhibition is advertised to surrounding wireless slave stations via the wireless master station, and the second threshold value is higher
- a high-frequency specific communication stop notification is transmitted to the radio slave station.
- the radio slave station If the storage rejection notice is transmitted to the mobile terminal and the fourth threshold value is equal to or lower than the first threshold value after the connection inhibition notification is advertised, the wireless master station passes through the wireless master station.
- the wireless slave station is configured to advertise a connection suppression release notification to surrounding wireless slave stations, and a wireless slave station whose connection destination is undetermined that has received the connection suppression notification cannot select another wireless master station.
- Another wireless master station can be selected by sending a connection request to the station, another wireless master station
- the wireless slave station that has transmitted the connection request and received the high-frequency specific communication stop notification stops the high-frequency specific communication, and the response to the low-frequency specific communication and the downlink communication from the collection control device is
- the wireless slave station that has continuously performed and received the accommodation refusal notification stops the low-frequency specific communication, continues to respond to the downlink communication from the collection control device, and sends the connection suppression release notification.
- the received wireless slave station is characterized in that the restriction on transmission of the connection request to the wireless master station is released.
- the collection control device detects in advance that the number of wireless slave stations connected to a specific wireless master station is exceeded, and notifies the wireless slave station to notify the wireless slave station, thereby selecting another wireless slave station. Since the station changes the transmission destination of the connection request to another wireless master station, the accommodation efficiency can be improved.
- the traffic is suppressed by performing function suppression through a connection suppression notification, a high frequency specific communication stop notification, and an accommodation refusal notification. System capacity can be used efficiently.
- the number of wireless slave stations accommodated in each wireless master station and the first to fourth threshold values can be set freely.
- the accommodation efficiency of the wireless slave station in the wireless master station can be enhanced, and a communication system and its congestion avoiding method that can be used efficiently while suppressing traffic, and a meter reading system using this communication system are obtained.
- FIG. 1 is a diagram for explaining a communication system and a congestion avoidance method according to an embodiment of the present invention.
- 1-1 and 1-2 are wireless master stations
- ⁇ marks are wireless slave stations that can communicate with the wireless master station
- 3 is a collection control device.
- the wireless slave stations indicated by ⁇ are communicable with each other, and form a mesh network that performs communication between the wireless slave stations.
- Each wireless slave station determines which wireless slave station or wireless master station to send information based on the route construction information received from the adjacent wireless slave station or wireless master station, and autonomously communicates with the communication route. Select.
- the wireless slave station can communicate with only the wireless master station 1-1 depending on the number of hops from the wireless master station 1-1 and the wireless master station 1-2 or the communication status.
- Possible wireless slave stations 2-1, 2-2, 2-3,..., Wireless slave stations 2-11, 2-12, 2 that can communicate with both the wireless master station 1-1 and the wireless master station 1-2 -13,..., And wireless slave stations 2-21, 2-22, 2-23,... That can communicate with only the wireless master station 1-2 are representatively shown.
- the wireless master station 1-1 and the wireless master station 1-2 communicate with the collection control device 3 by means such as wired communication.
- each of the wireless slave stations indicated by circles holds the identification information related to the wireless master station to which the information is to be sent in the main / sub order.
- the wireless slave stations 2-1, 2-2, 2-3 indicate the identification information of the wireless master station 1-1
- the wireless slave stations 2-11, 2-12, 2-13 1 and the wireless slave stations 2-21, 2-22, and 2-23 are rewritable storage devices such as a semiconductor memory and a hard disk.
- the data is stored in (third storage means), and data is transmitted to the main wireless master station.
- the identification information includes the path construction information periodically transmitted from the radio master stations 1-1 and 1-2, and the radio master station status collected from the collection control device 3 via the accommodated radio master stations. Based on the information, a wireless master station with which the wireless slave station can communicate is determined and written to the storage device.
- one of the wireless master stations 1-1 and 1-2 is several hundreds of wireless slave stations 2-1, 2-2, 2-3,..., 2-11, 2-12, 2- , 2-21, 2-22, 2-23,..., 2-11, 2-12,. 2-13,..., 2-21, 2-22, 2-23,.
- Wireless master stations 1-1, 1-2 and wireless slave stations 2-1, 2-2, 2-3, ..., 2-11, 2-12, 2-13, ..., 2-21, 2-22, 2-23,... are easily accommodated in a place with good wireless communication quality, and each wireless slave station transmits according to the wireless communication quality between the wireless slave stations around the wireless slave station or the wireless master station.
- the route to be determined is determined, and the wireless slave station hops to the wireless slave station and is finally aggregated to the wireless master station.
- the collection control device 3 transmits the wireless slave stations 2-1, 2-2, 2-3,..., 2-11, 2-12, 2-13 via the wireless master stations 1-1, 1-2. ,..., 2-21, 2-22, 2-23,... Are managed and monitored, and the number of wireless slave stations connected to a specific wireless master station is detected in advance, and the wireless slave stations 2-1, 2-2, 2-3,..., 2-11, 2-12, 2-13,..., 2-21, 2-22, 2-23,.
- This causes the wireless slave stations 2-11, 2-12, 2-13,... That can select other wireless master stations to change the transmission destination of the connection request to the other wireless master stations.
- the function is suppressed through “connection inhibition notification”, “high frequency specific communication stop notification”, and “accommodation rejection notification”.
- the collection control device 3 stores a plurality of threshold values in a rewritable storage device (second storage means) such as a semiconductor memory or a hard disk as a system or wireless master station unit parameter. Perform step-by-step communication suppression.
- a rewritable storage device such as a semiconductor memory or a hard disk as a system or wireless master station unit parameter.
- the first threshold value is a
- the second threshold value is b
- the third threshold value is c
- the fourth threshold value is d
- these threshold values have a relationship of d ⁇ a ⁇ b ⁇ c.
- the process with respect to the threshold value c is prioritized.
- the operation of the collection control device 3 is shown in the flowchart of FIG.
- the collection control device 3 receives the accommodation registration request from the wireless master station (S1), the number of terminals accommodated in the collection control device 3, in other words, the update of the number of connected wireless slave stations under the wireless master station (S2) ) Is performed. Then, it is determined whether or not the transition from the normal state to the suppression state is made (S3), whether or not the transition is made from the suppression state to the normal state (S6), and the number of wireless slave stations accommodated (S4).
- S4 determines the number of accommodated wireless slave stations (S4) after the transition determination from the normal state to the suppression state (S3) or the transition determination from the suppression state to the normal state (S6). However, if it is after terminal accommodation number update (S2), S4 may be performed before S3 or S6, or independently.
- the determination (S3) of whether or not the transition from the normal state to the suppression state is made based on whether or not the terminal capacity has transitioned from less than the threshold value a to more than the threshold value a.
- a “connection inhibition notification” is broadcast and transmitted to the wireless slave stations under the wireless master station (S5).
- This “connection inhibition notification” is advertised to the subordinate slave stations via the radio master station.
- the advertisement means information notified all at once by broadcast. Note that once a transition is made to the inhibition state, no connection inhibition notification is issued even if the threshold value a is exceeded.
- the state does not return to the normal state unless the threshold value is less than the threshold value d. Therefore, even if the suppression state changes to the threshold value d or more and less than the threshold value a. There is no transition to inhibition.
- the determination as to whether or not to transition from the deterred state to the normal state is made based on whether or not the number of terminals accommodated has shifted from the threshold value d to less than the threshold value d. If the number of terminals accommodated is less than the threshold value d, a “connection inhibition release notification” is broadcast and transmitted to the wireless slave stations under the wireless master station (S7).
- the wireless slave station that has received the “connection inhibition release notification” can transmit a connection request to the wireless master station. Further, the “connection inhibition release notification” can be realized by advertisement of a signal indicating the normality of the wireless master station. If the threshold value is equal to or greater than the threshold value d, the connection inhibition state is maintained.
- an accommodation registration response (normal) is transmitted (S8), and an accommodation registration request is received from a wireless slave station whose connection destination is undetermined.
- the wireless slave station is notified via the wireless master station. If it is greater than or equal to the threshold value b in step S4, a high-frequency communication stop determination is performed. In this determination, if the threshold is greater than or equal to b and less than c, an accommodation registration response (high frequency specific communication stop notification) is transmitted (S9).
- the wireless slave station that has received this accommodation registration response (high frequency specific communication stop notification) stops the high frequency specific communication and continues the response to the low frequency specific communication and the downlink communication from the collection control device 3. And do it.
- an accommodation registration response (acceptance rejection notice) is transmitted (S10).
- the wireless slave station that has received the accommodation registration response also stops the low-frequency specific communication, but continues to respond to the downlink communication from the collection control device 3. And after completion
- Table 1 below is a specific example of the accommodation number in the congestion avoidance method according to the present embodiment, and shows an operation outline accompanying increase / decrease of the accommodation number.
- This threshold value (accommodation number) can be freely set according to the system configuration and necessity, and may be set by a parameter other than the accommodation number.
- the collection control device 3 allows the wireless slave stations 2-1, 2-2, 2-3,. , 2-11, 2-12, 2-13,..., 2-21, 2-22, 2-23,..., 2-11, 2-12, 2-13,. -3,..., 2-11, 2-12, 2-13,..., 2-21, 2-22, 2-23,. 2-11, 2-12, 2-13,... Change the transmission destination of the connection request to another wireless master station, so that the accommodation efficiency can be improved.
- the function of traffic suppression is satisfied by performing function suppression through stages such as “connection suppression notification”, “frequent specific communication stop notification”, and “acceptance rejection notification” according to the number of wireless slave stations accommodated. It is possible to provide efficient system functions.
- This communication system basically includes a number of wireless slave stations 2-1, 2-2, 2-3, ..., 2-11, 2-12, 2-13, ..., 2-21, 2-22, Most of the traffic from 2-23,...
- 1-1, 1-2 send data such as measured values of various sensors at a high frequency, from the wireless master stations 1-1, 1-2 to the wireless slave stations 2-1, 2-2, 2-3,.
- a system that performs control by sending data such as control information to 2-11, 2-12, 2-13,..., 2-21, 2-22, 2-23,.
- FIG. 3 is a diagram showing a power usage meter reading system according to an embodiment of the present invention.
- Measuring devices 4-1, 4-2, 4-3,..., 4-11, 4-12,..., 4-21, 4-22, 4-23,. 4-32, 4-33,..., Wireless slave stations (communication units) 2-1, 2-2, 2-3,..., 2-11, 2-12,. .., 2-31, 2-32, 2-33,... are provided.
- These wireless slave stations 2-1, 2-2, 2-3, ..., 2-11, 2-12, ..., 2-21, 2-22, 2-23, ..., 2-31, 2-32 , 2-33,... are configured to communicate with each other, and are under the control of the wireless master stations 1-1, 1-2, and 1-3 installed on the utility poles.
- These wireless master stations 1-1, 1-2, 1-3 are connected to the collection control device 3 via a network 5 such as an optical fiber.
- the meter reading system has a wireless slave station number monitoring function by the collection control device 3 in order to avoid congestion.
- the radio slave station number monitoring function by the collection control device 3 manages the number of radio slave stations accommodated by each radio master station by managing the number of radio slave stations accommodated by each radio master station.
- the communication operation of the slave station is limited so that congestion does not occur.
- the collection control device 3 manages and monitors the number of wireless slave stations and wirelessly Using the slave station number threshold value excess notification request (start), the wireless master stations 1-1, 1-2, and 1-3 are requested to transmit advertisements (wireless slave station number threshold value exceeded).
- the wireless master stations 1-1, 1-2, and 1-3 return responses to the collection control device 3, and periodically send advertisements (the number of wireless slave stations exceeds the threshold) to notify that the number of accommodated wireless slave stations exceeds the threshold. Send.
- FIG. 4 shows the result when the wireless master station 1-1 becomes abnormal and many wireless slave stations select the wireless master station 1-2 as the main station.
- the collection control device 3 detects that the number of wireless slave stations exceeds the threshold
- a wireless slave station number threshold excess notification request (start) message is transmitted to the wireless master station 1-2.
- the wireless master station 1-2 broadcasts and periodically transmits an advertisement (wireless slave station threshold exceeded).
- the wireless slave station 2-12 represents an operation in which the wireless master station 1-2 is not selected as the main station, the wireless master station 1-3 is selected as the main station, and the accommodation registration request is transmitted. Yes.
- the radio slave station 2-1 transmits an accommodation registration request to another radio master station 1-2. Then, an accommodation registration request is issued from the wireless master station 1-2 to the collection control device 3. In response to this, the collection control device 3 transmits an accommodation registration response to the wireless master station 1-2, and an accommodation registration response is issued from the wireless master station 1-2 to the wireless slave station 2-1.
- the collection control device 3 transmits a wireless slave station number threshold value excess notification request (start) to the wireless master station 1-2, and a wireless slave station number threshold value excess notification response is sent from the wireless master station 1-2 to the collection control device 3 Sent to.
- start a wireless slave station number threshold value excess notification request
- a wireless slave station number threshold value excess notification response is sent from the wireless master station 1-2 to the collection control device 3 Sent to.
- an advertisement is issued to each radio slave station under the radio master station 1-2 under the control of the collection control device 3. It is.
- the wireless slave station 2-2 transmits an accommodation registration request to the wireless master station 1-3, and an accommodation registration request is issued from the wireless master station 1-3 to the collection control device 3.
- the collection control device 3 transmits an accommodation registration response to the wireless master station 1-3, and an accommodation registration response is issued from the wireless master station 1-3 to the wireless slave station 2-2. 2 is registered in the wireless master station 1-3.
- the measured value of the 30-minute meter reading (hereinafter referred to as a 30-minute value) is transmitted to the collection control device 3 via the wireless master stations 1-2 and 1-3.
- the collection control device 3 is a wireless slave station 2-1, 2-2, 2-3,. , 2-21, 2-22, 2-23,..., 2-31, 2-32, 2-33,...
- FIG. 5 shows that as a result of the radio master station 1-1 becoming abnormal and many radio slave stations selecting the radio master station 1-2 as the main station,
- A The collection control device 3 detects that the number of wireless slave stations exceeds the threshold
- B transmits a wireless slave station number threshold excess notification request (start) to the wireless master station 1-2.
- C The wireless master station 1-2 Broadcast transmission and periodic transmission of advertisement (exceeding the threshold value of the number of wireless slave stations)
- the wireless slave station 2-2 can recognize only the wireless master stations 1-1 and 1-2, the wireless master station 1-2 Is selected as the master station, and the accommodation registration request is transmitted.
- E Since the number of accommodations exceeds the number of terminals allowed for 30-minute value notification, the collection control device 3 sends an accommodation registration response (30-minute value stop instruction). Represents the operation.
- the collection control device 3 is a wireless slave station 2-1, 2-2, 2-3, ..., 2-11, 2-12, ..., 2-
- An accommodation registration response (accommodation refusal) can be returned.
- the wireless slave station that has received the accommodation registration response suppresses transmission of the accommodation registration request until an advertisement (normal) is received.
- the wireless slave station that has received the accommodation refusal by the accommodation registration response resumes from the accommodation registration request. Further, the transmission of the 30-minute value is stopped until the accommodation registration request is transmitted and the normal response is received. Further, other low-frequency uplink communications are suppressed until an accommodation registration request is transmitted and a response other than accommodation rejection is received.
- FIG. 6 shows the result that the wireless master station 1-1 becomes abnormal, and many wireless slave stations have selected the wireless master station 1-2 as the main station.
- the collection control device 3 detects that the number of wireless slave stations exceeds the threshold (b) transmits a wireless slave station number threshold excess notification request (start) to the wireless master station 1-2.
- the wireless master station 1-2 Broadcast transmission and periodic transmission of advertisement (exceeding the threshold value of the number of wireless slave stations)
- the wireless slave station 2-11 can recognize only the wireless master stations 1-1 and 1-2, the wireless master station 1-2 Is selected as the main station, and the accommodation registration request is transmitted.
- the collection control device transmits an accommodation registration response (accommodation refusal).
- Function for requesting transmission of advertisement (normal) to wireless master station Collection control device 3 manages and monitors the number of wireless slave stations, and determines that the number of wireless slave stations exceeds the threshold value. By using the excess notification request (stop), the wireless master stations 1-1, 1-2, and 1-3 are requested to transmit advertisements (normal). The wireless master stations 1-1, 1-2, 1-3 return responses to the collection control device 3 and periodically send advertisements (normal). Wireless slave stations 2-1, 2-2, 2-3,..., 2-11, 2-12,..., 2-21, 2-22, 2-23,. -3, 2-32, 2-33,... Allow the received radio master station to be selected as the main sub-station, regardless of whether or not there are other radio master stations to be selected.
- FIG. 7 shows the result of the occurrence of a large number of wireless slave stations that have transferred the master station from the wireless master station 1-2 to another wireless master station.
- the collection control device 3 detects release of the wireless slave station number threshold value excess of the wireless master station 1-2
- (b) transmits a wireless slave station number threshold value excess notification request (stop) message to the wireless master station 1-2
- the radio master station 1-2 broadcasts and periodically sends advertisements (normal).
- the radio slave station 2-2 selects the radio master station 1-2 as the main station and sends an accommodation registration request. Represents the action that is being performed.
- the collection control device 3 When the collection control device 3 detects that the number of wireless slave stations exceeds the threshold by the operation in which the wireless slave station 2-2 in (d) selects the wireless master station 1-2 as the main station and transmits the accommodation registration request,
- the advertisement (exceeding the wireless slave station threshold) is transmitted by the operation described with reference to FIG.
- the collection control device can transmit a 30-minute value stop response and an accommodation refusal response in response to the operation (d).
- the present invention it is possible to increase the accommodation efficiency of the wireless slave station in the wireless master station, and to efficiently use the communication while suppressing traffic, and the congestion avoidance method thereof, and the communication system.
- a meter reading system using can be obtained.
- the meter reading system for measuring the amount of electric power used has been described as an example, but the present invention can be similarly applied to a system for measuring the amount of use of gas or water. Further, for example, in a wireless terminal such as a mobile phone, it can be widely applied to a case where traffic for emergency communication is to be secured.
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Abstract
Description
(1)無線親局1-1、1-2、1-3に、広告(無線子局数閾値超過)を送信要求する機能
収集制御装置3は、無線子局数を管理・監視し、無線子局数閾値超過通知要求(開始)を用いて、無線親局1-1、1-2、1-3に広告(無線子局数閾値超過)を送信要求する。無線親局1-1、1-2、1-3は応答を収集制御装置3に返し、無線子局の収容台数が閾値を超過したことを通知する広告(無線子局数閾値超過)を定期送信する。
(a)収集制御装置3が無線子局数閾値超過を検出
(b)無線親局1-2に対し無線子局数閾値超過通知要求(開始)メッセージを送信
(c)無線親局1-2がブロードキャスト送信で、広告(無線子局数閾値超過)を定期送信
(d)無線子局2-12は、無線親局1-2を主局として選択せず、無線親局1-3を主局として選択し、収容登録要求を送信
している動作を表している。
収集制御装置3は、無線子局2-1、2-2、2-3、…、2-11、2-12、…、2-21、2-22、2-23、…、2-31、2-32、2-33、…から受信した収容登録要求に対して、30分値停止応答を返すことができる。
(a)収集制御装置3が無線子局数閾値超過を検出
(b)無線親局1-2に対し無線子局数閾値超過通知要求(開始)を送信
(c)無線親局1-2がブロードキャスト送信で、広告(無線子局数閾値超過)を定期送信
(d)無線子局2-2は、無線親局1-1、1-2しか認識できていないため、無線親局1-2を主局として選択し、収容登録要求を送信
(e)収容数が30分値通知許容端末数を超過していたため、収集制御装置3が収容登録応答(30分値停止指示)を送信
している動作を表している。
収集制御装置3は、無線子局2-1、2-2、2-3、…、2-11、2-12、…、2-21、2-22、2-23、…2-31、2-32、2-33、…から受信した収容登録要求に対して、収容登録応答(収容拒否)を返すことができる。
(a)収集制御装置3が無線子局数閾値超過を検出
(b)無線親局1-2に対し無線子局数閾値超過通知要求(開始)を送信
(c)無線親局1-2がブロードキャスト送信で、広告(無線子局数閾値超過)を定期送信
(d)無線子局2-11は、無線親局1-1、1-2しか認識できていないため、無線親局1-2を主局として選択し、収容登録要求を送信
(e)収容数が収容許容端末数を超過していたため、収集制御装置が収容登録応答(収容拒否)を送信
している動作を表している。
収集制御装置3は、無線子局数を管理・監視し、無線子局数閾値超過解除を判断した場合、無線子局数閾値超過通知要求(停止)を用いて、無線親局1-1、1-2、1-3に広告(正常)を送信要求する。無線親局1-1、1-2、1-3は応答を収集制御装置3に返し、広告(正常)を定期送信する。この広告(正常)を受信した無線子局2-1、2-2、2-3、…、2-11、2-12、…、2-21、2-22、2-23、…、2-31、2-32、2-33、…は、他に選択する無線親局が存在する、しないに拘わらず、受信した無線親局を主副局として選択可能とする。
(a)収集制御装置3が無線親局1-2の無線子局数閾値超過解除を検出
(b)無線親局1-2に対し無線子局数閾値超過通知要求(停止)メッセージを送信
(c)無線親局1-2がブロードキャスト送信で、広告(正常)を定期送信
(d)無線子局2-2は、無線親局1-2を主局として選択し、収容登録要求を送信
している動作を表している。
2-1、2-2、2-3、…、2-11、2-12、2-13、…、2-21、2-22、2-23、… 無線子局
3 収集制御装置
4-1、4-2、4-3、… 測定装置
5 ネットワーク
a、b、c、d 閾値
Claims (6)
- 複数の無線子局が、無線親局と直接または他の無線子局を経由して無線通信を行い、無線親局を介して収集制御装置と通信を行う通信システムにおいて、
前記収集制御装置は、各無線親局に収容している無線子局の収容台数を管理する第1の記憶手段と、無線親局に収容する無線子局の収容台数を決定する第1乃至第4の閾値を記憶した第2の記憶手段とを備え、
無線子局から特定の無線親局配下への接続要求を受信したときに、当該無線親局配下の無線子局接続数が第1の閾値以上に達した場合、当該無線親局を経由して周囲の無線子局に接続抑止通知を広告し、前記第1の閾値よりも高い第2の閾値以上第3の閾値未満に達した場合、当該無線子局に対して高頻度の特定通信停止通知を送信し、前記第2の閾値よりも高い第3の閾値以上に達した場合、当該無線子局に対して収容拒否通知を送信し、前記接続抑止通知の広告後に前記第1の閾値と等しいか、または前記第1の閾値よりも低い第4の閾値を下回った場合、当該無線親局を経由して周囲の無線子局に接続抑止解除通知を広告するように構成されていることを特徴とする通信システム。 - 前記収集制御装置から送信される前記接続抑止通知を受信した接続先が未定の無線子局は、他の無線親局を選択できない場合は前記特定の無線親局へ接続要求を送信し、他の無線親局を選択できる場合は他の無線親局へ接続要求を送信し、
前記高頻度の特定通信停止通知を受信した当該無線子局は、高頻度の特定通信を停止し、低頻度の特定通信及び前記収集制御装置からの下り通信への応答は継続して行い、
前記収容拒否通知を受信した当該無線子局は、低頻度の特定通信を停止し、前記収集制御装置からの下り通信への応答は継続して行い、
前記接続抑止解除通知を受信した無線子局は、当該無線親局への接続要求の送信制約を解除する請求項1に記載の通信システム。 - 前記第1、第2の記憶手段はそれぞれ書き換え可能である請求項1に記載の通信システム。
- 前記複数の無線子局はそれぞれ、収容される無線親局の識別情報を記憶する第3の記憶手段を備え、無線親局から定期的に送信される経路構築情報、および収容されている無線親局を介して前記収集制御装置から供給される無線親局ステータス情報に基づいて、当該無線親局の識別情報が書き込まれる請求項1または2に記載の通信システム。
- 複数の無線子局が、無線親局と直接または他の無線子局を経由して無線通信を行い、無線親局を介して収集制御装置と通信を行う通信システムの輻輳回避方法において、
無線子局から特定の無線親局配下への接続要求を受信したときに、当該無線親局配下の無線子局接続数が第1の閾値以上に達した場合、前記収集制御装置から当該無線親局を経由して、周囲の無線子局に接続抑止通知を広告するステップと、
前記接続抑止通知を受信した接続先が未定の無線子局は、他の無線親局を選択できない場合は前記無線親局へ接続要求を送信し、他の無線親局を選択できる場合は他の無線親局へ接続要求を送信するステップと、
無線子局から特定の無線親局配下への接続要求を受信したときに、当該無線親局配下への無線子局接続数が前記第1の閾値よりも高い第2の閾値以上第3の閾値未満に達した場合、前記収集制御装置から当該無線子局に対して、高頻度の特定通信停止通知を送信するステップと、
前記高頻度の特定通信停止通知を受信した当該無線子局における高頻度の特定通信を停止し、低頻度の特定通信及び前記収集制御装置からの下り通信への応答は継続して行うステップと、
無線子局からの特定の無線親局配下への接続要求を受信したときに、当該無線親局配下の無線子局接続数が前記第2の閾値よりも高い第3の閾値以上に達した場合、前記収集制御装置から当該無線子局に対して、収容拒否通知を送信するステップと、
前記収容拒否通知を受信した無線子局における低頻度の特定通信を停止させ、前記収集制御装置からの下り通信への応答は継続して行うステップと、
特定の無線親局配下への無線子局収容数が前記接続抑止通知の広告後に前記第1の閾値と等しいか、または前記第1の閾値よりも低い第4の閾値を下回った場合、前記収集制御装置から当該無線親局を経由して、周囲の無線子局に接続抑止解除通知を広告するステップと、
前記接続抑止解除通知を受信した無線子局から当該無線親局への接続要求の送信制約を解除するステップとを具備することを特徴とする通信システムの輻輳回避方法。 - 複数の測定装置と、これらの測定装置にそれぞれ設けられ、測定値を無線で送信する無線子局と、複数の無線子局を収容する無線親局を介して測定値を収集し、前記複数の無線親局を選択的に介して前記複数の無線子局を制御する収集制御装置とを備え、前記複数の無線子局が、無線親局と直接または他の無線子局を経由して無線通信を行い、無線親局を介して収集制御装置と通信を行う検針システムにおいて、
前記収集制御装置は、各無線親局に収容している無線子局の収容台数を管理する第1の記憶手段と、無線親局に収容する無線子局の収容台数を決定する第1乃至第4の閾値を記憶した第2の記憶手段とを備え、無線子局から特定の無線親局配下への接続要求を受信したときに、当該無線親局配下の無線子局接続数が第1の閾値以上に達した場合、当該無線親局を経由して周囲の無線子局に接続抑止通知を広告し、前記第1の閾値よりも高い第2の閾値以上第3の閾値未満に達した場合、当該無線子局に対して高頻度の特定通信停止通知を送信し、前記第2の閾値よりも高い第3の閾値以上に達した場合、当該無線子局に対して収容拒否通知を送信し、前記接続抑止通知の広告後に前記第1の閾値と等しいか、または前記第1の閾値よりも低い第4の閾値を下回った場合、当該無線親局を経由して周囲の無線子局に接続抑止解除通知を広告するように構成され、
前記接続抑止通知を受信した接続先が未定の無線子局は、他の無線親局を選択できない場合は前記無線親局へ接続要求を送信し、他の無線親局を選択できる場合は他の無線親局へ接続要求を送信し、
前記高頻度の特定通信停止通知を受信した無線子局は、高頻度の特定通信を停止し、低頻度の特定通信及び前記収集制御装置からの下り通信への応答は継続して行い、
前記収容拒否通知を受信した無線子局は、低頻度の特定通信を停止し、前記収集制御装置からの下り通信への応答は継続して行い、
前記接続抑止解除通知を受信した無線子局は、当該無線親局への接続要求の送信制約を解除することを特徴とする検針システム。
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