WO2015008315A1 - メッセージ送受信装置、自動検針システム、およびメッセージ送受信方法 - Google Patents
メッセージ送受信装置、自動検針システム、およびメッセージ送受信方法 Download PDFInfo
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- WO2015008315A1 WO2015008315A1 PCT/JP2013/004326 JP2013004326W WO2015008315A1 WO 2015008315 A1 WO2015008315 A1 WO 2015008315A1 JP 2013004326 W JP2013004326 W JP 2013004326W WO 2015008315 A1 WO2015008315 A1 WO 2015008315A1
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- message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/15—Interconnection of switching modules
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/565—Conversion or adaptation of application format or content
- H04L67/5651—Reducing the amount or size of exchanged application data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
- H04L67/61—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources taking into account QoS or priority requirements
Definitions
- the present invention relates to a message transmission / reception device for transmitting / receiving data such as a meter reading value of a smart meter and control data of an application server by message communication, and a message priority control system.
- the network bandwidth between the smart meter and the relay device, the network between the relay device and the message transmission / reception device, the network bandwidth between the message transmission / reception device and the application server, communication speed, communication medium, and communication method are different.
- the application server and the smart meter transmit and receive data such as meter reading values and control information such as open / close control by message communication.
- Messages to be sent and received include messages in the upstream direction (from meter, relay device to application) and messages in the downstream direction (from application to relay device, meter).
- a one-way message for giving a control instruction and a two-way message returned by a meter or a relay device in response to an instruction from an application are mixed.
- the amount of traffic between the upstream message and the downstream message is asymmetric, and there are characteristics that there are a time zone with a large traffic volume and a time zone with a small traffic volume, and the traffic volume is uneven.
- the smart meter automatic meter reading system needs to control the priority of messages effectively in accordance with the application of various characteristics on the non-homogeneous and asymmetric network to which the devices with large restrictions are connected. is there. Further, in the smart meter automatic meter reading system, since smart meters and relay devices of a plurality of vendors are connected, the priority control system to be mounted differs depending on the vendor, and there are some which do not have a priority control function. When a relay device having no priority control function is connected and a low-priority message stays in the buffer of the relay device, a high-priority message transmitted later is put on standby until the retained message is processed.
- the amount of staying messages is monitored, and by controlling the transmission amount from the transmission side when a preset threshold value is exceeded, even for a relay device without a priority control function, High priority messages can be processed preferentially.
- a multi-vendor environment such as a smart meter automatic meter reading system in which smart meters and relay devices of a plurality of vendors are connected, it is difficult to implement a function for performing similar control on relay device products of other companies. There was a problem. Furthermore, there is a problem that it is difficult to set an appropriate threshold for limiting the amount of staying messages in accordance with the presence / absence of the priority control function in the relay device of other companies and the implemented priority control method.
- the present invention has been made to solve the above-mentioned problems, and priority is given to a message having a high priority even in a multi-vendor environment in which the presence or absence of a priority control function for each vendor and the implemented priority control method are different.
- An object of the present invention is to provide a message transmission / reception device that can be processed automatically.
- the present invention receives an uplink message transmitted from a wireless terminal to an application server via a relay device, and transmits a downstream message transmitted from the application server to the wireless terminal via the relay device.
- a message transmission / reception device for transmitting to the wireless terminal A stay monitoring unit that receives the number of messages staying in the downstream direction staying in the relay device from the relay device, and monitoring the stay status of messages in the relay device; Based on a comparison between the number of stay messages received by the stay monitoring unit and a predetermined threshold value, a flow rate instruction unit that instructs the amount of the message that the message transmitting / receiving device transmits to the relay device; In accordance with an instruction from the flow rate instruction unit, a flow rate control unit that controls the amount of the message transmitted to the relay device; A transmission / reception information storage unit that holds information about the message transmitted from the message transmission / reception device to the relay device, and information about the message transmitted from the relay device to the message transmission / reception device; When a high-priority message with a high priority is received, the number of
- the threshold value for determining the transmission amount of the message to the relay apparatus based on the number of messages overtaken until the high priority message transmitted from the relay apparatus is received Since the adjustment is performed, it is possible to preferentially process a message having a high priority even in a multi-vendor environment.
- FIG. 1 is a system configuration diagram showing a message transmitting / receiving apparatus according to an embodiment of the present invention. It is a table which shows the content of the transmission / reception information storage part. It is a table which shows the contents of a flow control information storage part. It is a flowchart which shows operation
- FIG. 1 is a schematic diagram of a smart meter automatic meter reading system targeted by the present invention.
- a smart meter automatic meter-reading system includes a smart meter 4, a relay device 3, a message transmission / reception device 2, and an application server 1 connected via a tree-structured network.
- the smart meter 4 uses power, gas, water, and the like.
- Message communication is performed with one or more applications operating on the application server via the message transmission / reception device 2 and the relay device provided between the message transmission / reception device 2 and the smart meter 4. .
- FIG. 2 is a system configuration diagram showing the message transmitting / receiving apparatus 2 according to an embodiment of the present invention.
- a message flowing in the direction from the relay device 3 to the application server 1 is referred to as an upstream message
- a message flowing in the direction from the application server 1 to the relay device 3 is referred to as a downstream message.
- an application server 1 is a device on which an application related to automatic meter reading operates, and a plurality of applications uniquely recognized by application IDs operate.
- the relay device 3 is a device that relays messages with the smart meter
- the message transmission / reception device 2 is a device that controls message transmission / reception between the application on the application server 1 and the relay device 3.
- the upstream reception unit 201 receives a message from the relay device 3.
- the upstream transmission unit 202 sends a message to the application server 1.
- the priority control unit 203 performs priority control for uplink and downlink message communication.
- the transmission / reception information storage unit 204 stores communication records of reception of upstream messages and transmission of downstream messages.
- the downlink receiving unit 205 receives a message from the application server 1.
- the downlink transmission unit 206 sends a message to the relay device 3.
- the flow rate control unit 207 controls the flow rate of message transmission to the relay device 3.
- a flow rate instruction unit 208 instructs a flow rate controlled by the flow rate control unit 207.
- the stay monitoring unit 209 monitors the number of downlink stay messages in the relay device 3.
- the priority control effect monitoring unit 210 monitors the effect of priority control based on the information stored in the transmission / reception information storage unit 204.
- the threshold adjustment unit 211 adjusts the threshold of the number of staying messages that is a criterion for determining the flow rate of the downstream message.
- the flow control information storage unit 212 stores information necessary for flow control.
- the priority control unit 203 includes a high-priority queue and a low-priority queue as queues for each priority in the uplink direction and the downlink direction. Furthermore, the downlink low priority queue has a queue for each relay apparatus connected to the message transmission / reception server 2.
- FIG. 3 is a table showing the contents of the transmission / reception information storage unit 204.
- the transmission / reception information storage unit 204 includes a reception information table 204a illustrated in FIG. 3A and a transmission information table 204b illustrated in FIG.
- the reception information table 204a includes items of reception time, message ID, message type, priority, transmission source meter ID, relay device ID, and transmission destination application ID, and the uplink reception unit 201 receives a message from the relay device 3. Will be added to when.
- the reception time is the time when the upstream receiving unit 201 receives a message.
- the message ID is an ID for uniquely identifying the message and is assigned by the transmission source application.
- the response message is given the same message ID as the corresponding request message.
- the priority is a priority level of a message given by the transmission source application, and is given as “high” or “low”.
- the transmission source meter ID is an ID for uniquely identifying the meter that transmitted the message
- the relay device ID is an ID for uniquely identifying the relay device through which the message has passed.
- the transmission destination application ID is an ID for uniquely identifying the application on the application server 1 to which the message is finally sent.
- the transmission information table 204b includes items of transmission time, message ID, message type, priority, transmission destination meter ID, relay device ID, and transmission source application ID.
- the downlink transmission unit 206 transmits a message to the relay device 3. Sometimes added.
- the transmission time is the time when the downlink transmission unit 206 transmits a message.
- the message ID is an ID for uniquely identifying the message and is assigned by the transmission source application.
- As the message type a request (message requesting a response) or a notification (unilateral message from the transmission source application) is given.
- the priority is a priority level of a message given by the transmission source application, and is given as “high” or “low”.
- the transmission destination meter ID is an ID for uniquely specifying the meter to which the message is finally sent
- the relay device ID is an ID for uniquely specifying the relay device to which the downlink transmission unit transmits the message.
- the transmission source application ID is an ID for uniquely identifying the application of the application server 1 that has transmitted the message.
- FIG. 4 is a table showing the contents of the flow rate control information storage unit 212.
- the flow control information storage unit 212 includes a flow control information table 212a shown in FIG. 4A and a relay device index 212b shown in FIG. 4B.
- the flow rate control information table 212a includes an index that is a sequential number in the table, a relay device ID that uniquely identifies the relay device connected to the message transmission / reception server 2, and a flow rate that indicates the content of the flow rate instruction from the flow rate instruction unit 208.
- the instruction value, the threshold value indicating the value of the downlink staying message number serving as a reference for determining the flow rate instruction, and the number of downlink staying messages indicating the current staying status when determining the flow rate instruction are stored.
- the flow rate instruction value is “0” indicating transmission stop when the number of downlink staying messages is larger than the threshold, and “1” indicating transmission possible when the number is small.
- the relay device index 212b is an index of the flow control information table 212a indicating which relay device the low priority queue is to be processed next by the flow control unit 207.
- the uplink receiving unit 201 receives the message, the message type, the message ID, the priority, the transmission source meter ID, and the relay device. Information such as an ID and a destination application ID is stored in the transmission / reception information storage unit 204.
- the transmission / reception information storage unit 204 notifies the priority control effect monitoring unit 210 of the message ID of the message.
- the uplink receiving unit 201 sends a message to the priority control unit 203.
- the priority control unit 203 puts the received message into the high priority queue or the low priority queue according to the priority.
- the upstream transmission unit 202 extracts the message from the high priority queue, and when there is no message in the high priority queue, extracts the message from the low priority queue and transmits the extracted message It is sent to the application on the application server 1 indicated by the destination application ID.
- the application on the application server 1 receives the sent message.
- the downlink reception unit 205 transmits the received message to the priority control unit 203.
- the priority control unit 203 puts the message in a queue corresponding to the priority of the message and the relay apparatus that transmits the message.
- the flow control unit 207 extracts the message from the high priority queue, and when there is no message in the high priority queue, the instruction of the flow rate instruction unit 208 is stored. A message is extracted from the low priority queue according to the flow rate control information, and is sent to the downlink transmission unit 206.
- the flow control unit 207 extracts a message from the low priority queue of the relay device indicated by the relay device index 212b of the flow control information storage unit 212. At this time, if the flow instruction unit 208 instructs to stop transmission to the relay device, the message is not extracted from the low priority queue of the relay device, but is extracted from the low priority queue of the next relay device. To work.
- the message sent from the flow control unit 207 to the downlink transmission unit 206 is sent to the message transmission destination relay device. After transmitting the message, the downlink transmission unit 206 stores information such as transmission time, message type, message ID, priority, transmission source application ID, transmission destination meter ID, and relay device ID in the transmission / reception information storage unit 204 as a transmission record. Store.
- FIG. 5 is a flowchart showing the operation of the flow control unit 207.
- the flow control unit 207 checks whether there is a message in the high priority queue of the priority control unit 203 (S1). If there is a message, the flow control unit 207 extracts the message and sends it to the downlink transmission unit 206 (S2), and the flow head (S1). Return to. If there is no message in the high priority queue, the relay device index 212b stored in the flow control information storage unit 212 is read (S3), and it is checked whether there is a message in the low priority queue of the relay device indicated by the relay device index 212b (S4).
- the flow rate instruction value of the relay device is read from the flow rate control information storage unit 212 (S5). If the flow rate instruction value is “1 (transmittable)”, the message is extracted from the low priority queue and sent to the downlink transmission unit 206 (S7), the relay device index 212b is incremented (S8), and the flow head (S1) is reached. Return. If there is no message in the low priority queue, or if the flow rate instruction value of the relay device read from the flow rate control information storage unit 212 is “0 (not transmittable)” even if there is a message, the relay device index 212b is incremented. (S8), the process returns to the top of the flow (S1).
- FIG. 6 is a flowchart showing the operation of the flow rate instruction unit 208.
- the flow rate instruction unit 208 starts processing upon receiving the notification of the number of downward staying messages and the relay device ID written by the stay monitoring unit 209 in the flow rate control information storage unit 212.
- the flow rate instruction unit 208 searches the flow rate control information storage unit 212 based on the relay device ID, and extracts a corresponding threshold value (S1).
- the extracted threshold value is compared with the number of downlink staying messages notified from the stay monitoring unit 209 (S2).
- the residence monitoring unit 209 periodically receives the number of downstream residence messages of the relay device from the relay device 3, and stores the downstream residence message of the relay device stored in the flow rate control information storage unit 212. The number is overwritten with the number of received messages staying down. The stay monitoring unit 209 notifies the flow control information storage unit 212 of the number of written down stay messages together with the relay device ID.
- FIG. 7 is a flowchart showing the operation of counting the number of overtaking messages in the priority control effect monitoring unit 210.
- the uplink receiving unit 201 receives a message with a priority of “high” and a message type of “response” (referred to as message A)
- the message ID of the message A is assigned to the priority control effect monitoring unit 210, and the processing is performed.
- the priority control effect monitoring unit 210 searches the transmission / reception information storage unit 204 based on the message ID of the message A, and takes out records at the time of transmission and reception of the message A (S1).
- the difference between the transmission time and the reception time is calculated as the response time of the message A (S2).
- the calculated response time is compared with a predetermined value (S3). If the response time is shorter than the specified value, it is determined that priority control is effective, and the process is terminated. If the calculated response time is longer than the predetermined response time, it is determined that the priority control is not effective, and the message A is overtaken between the time when the message A is transmitted and the time it is received in the following procedure.
- the number of received messages is counted and notified to the threshold adjustment unit 211 together with the transmission source relay device ID (S4 to S7).
- the priority control effect monitoring unit 210 is a message of a message (referred to as message B) received immediately before receiving message A among messages of low priority having the same transmission source relay device ID as message A.
- the ID is extracted from the transmission / reception information storage unit 204 (S4), the transmission / reception information storage unit 204 is searched based on the message ID of the message B, and the record at the time of transmission of the message B is extracted (S5). Further, out of the messages with the priority “low” between the transmission time of the message B and the transmission time of the message A, the number of transmission records of the message having the same transmission source relay device ID as the messages A and B is overtaken. The number of messages is counted (S6). The counted number of passing messages is notified to the threshold adjustment unit 211 together with the transmission source relay device ID (S7).
- FIG. 8 is a flowchart showing the operation of the threshold adjustment unit.
- the threshold adjustment unit 211 searches the flow rate control information storage unit 212 based on the relay device ID notified from the priority control effect monitoring unit 210, and extracts the number of downlink stay messages and the threshold value of the corresponding relay device (S1). Next, a comparison is made between the number of downlink dwell messages retrieved and the number of overtaking messages notified from the priority control effect monitoring unit 210 (S2).
- the threshold extracted from the flow control information storage unit 212 is decremented (S3), and the flow control information storage unit 212 is decremented by the decremented value. (S4).
- the ratio by which the number of downlink staying messages is multiplied is an adjustment value for reliably determining that the number of overtaking messages is sufficiently smaller than the number of staying downlink messages, and is set to a value of 60%, for example.
- the threshold value used as a criterion for determining the flow control for stopping message transmission to the relay device is adjusted. Therefore, in a multi-vendor environment, an appropriate threshold value can be set for each relay device regardless of the presence or absence of the priority control function of another company's relay device and the difference in the implemented priority control method.
- the message transmission / reception apparatus can be used for a message priority control method for transmitting / receiving smart meter metering data and application server control data between a wireless terminal and an application server.
- 1 application server 2 message transmission / reception server, 3 relay device, 4 smart meter, 201 upstream reception unit, 202 upstream transmission unit, 203 priority control unit, 204 transmission / reception information storage unit, 205 downstream reception unit, 206 downstream transmission unit, 207 flow rate Control unit, 209 retention monitoring unit, 210 priority control effect monitoring unit, 211 threshold adjustment unit, 208 flow rate instruction unit, 212 flow rate control information storage unit
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Abstract
Description
前記中継装置に滞留する下り方向の滞留メッセージの数を前記中継装置から受信し、当該中継装置におけるメッセージの滞留状況を監視する滞留監視部と、
前記滞留監視部が受信した前記滞留メッセージの数と所定の閾値との比較に基づいて、前記メッセージ送受信装置が前記中継装置に送信する前記メッセージの量を指示する流量指示部と、
前記流量指示部からの指示にしたがって、前記中継装置に送信する前記メッセージの量を制御する流量制御部と、
前記メッセージ送受信装置から前記中継装置に送信される前記メッセージに関する情報および、前記中継装置から前記メッセージ送受信装置に送信される前記メッセージに関する情報を保持する送受信情報記憶部と、
優先度の高い高優先度メッセージを受信した際、当該高優先度メッセージが前記中継器から送信されてから受信されるまでの間、前記高優先度メッセージが追い越したメッセージの数を前記送受信情報記憶部の情報に基づいて算出する優先制御効果監視部と、
前記優先制御効果監視部において算出された前記追い越したメッセージの数に基づいて前記閾値を調整する閾値調整部と、
を具備するものである。
図1はこの発明が対象とするスマートメータ自動検針システムの概略図である。図1において、スマートメータ自動検針システムは、スマートメータ4、中継装置3、メッセージ送受信装置2、アプリケーションサーバ1が、ツリー構造のネットワークで接続され、スマートメータ4は電力、ガス、水道等の使用量を測定し、アプリケーションサーバ上で動作する1つ以上のアプリケーションとの間で、メッセージ送受信装置2と、メッセージ送受信装置2とスマートメータ4間に配備される中継装置を経由して、メッセージ通信を行う。
中継装置3が上りメッセージをメッセージ送受信装置2に送信すると、上り受信部201はメッセージの受信時刻、メッセージ種別、メッセージID、優先度、送信元メータID、中継装置ID、送信先アプリケーションIDなどの情報を送受信情報記憶部204に格納する。送受信情報記憶部204は、受信したメッセージの優先度が「高」でかつ、メッセージ種別が「応答」の場合に、優先制御効果監視部210に当該メッセージのメッセージIDを通知する。さらに、上り受信部201はメッセージを優先制御部203に送る。優先制御部203は、優先度に応じて、受信したメッセージを高優先キューまたは低優先キューに入れる。上り送信部202は、優先制御部の高優先キューにメッセージがある場合、高優先キューからメッセージを取り出し、高優先キューにメッセージがない場合は、低優先キューからメッセージを取り出し、取り出したメッセージを送信先アプリケーションIDで示されるアプリケーションサーバ1上のアプリケーションに送る。アプリケーションサーバ1上のアプリケーションは送られたメッセージを受信する。
アプリケーションサーバ1が下りメッセージをメッセージ送受信サーバ2に送信すると、下り受信部205は受信したメッセージを優先制御部203に送る。優先制御部203は、メッセージの優先度とメッセージを送信する中継装置に応じたキューにメッセージを入れる。流量制御部207は、優先制御部203の高優先キューにメッセージがある場合、高優先キューからメッセージを取り出し、高優先キューにメッセージがない場合には、流量指示部208の指示が記憶されている流量制御情報にしたがって低優先キューからメッセージを取り出し、下り送信部206へ送る。低優先キューからメッセージを取り出す場合、流量制御部207は流量制御情報記憶部212の中継装置インデックス212bが示す中継装置の低優先キューからメッセージを取り出す。この際、流量指示部208から当該中継装置への送信停止が指示されている場合には、当該中継装置の低優先キューからはメッセージを取り出さずに、次の中継装置の低優先キューから取り出すように動作する。流量制御部207から下り送信部206に送られたメッセージは、メッセージ送信先の中継装置に送られる。下り送信部206はメッセージを送信後、送信の記録として、送信時刻、メッセージ種別、メッセージID、優先度、送信元アプリケーションID、送信先メータID、中継装置IDなどの情報を送受信情報記憶部204に格納する。
図5は、流量制御部207の動作を示すフローチャートである。流量制御部207は、優先制御部203の高優先キューにメッセージがあるかを調べ(S1)、メッセージがある場合、当該メッセージを取り出して下り送信部206へ送り(S2)、フロー先頭(S1)へ戻る。高優先キューにメッセージがない場合、流量制御情報記憶部212に記憶された中継装置インデックス212bを読み出し(S3)、中継装置インデックス212bが示す中継装置の低優先キューにメッセージがあるかどうか調べ(S4)、メッセージがある場合、当該中継装置の流量指示値を流量制御情報記憶部212から読み出す(S5)。流量指示値が「1(送信可能)」であれば、低優先キューからメッセージを取り出して下り送信部206へ送り(S7)、中継装置インデックス212bをインクリメントし(S8)、フロー先頭(S1)へ戻る。低優先キューにメッセージがなかった場合、または、メッセージがあっても流量制御情報記憶部212から読み出した中継装置の流量指示値が「0(送信不可)」であれば、中継装置インデックス212bをインクリメントし(S8)、フロー先頭(S1)へ戻る。
図6は、流量指示部208の動作を示すフローチャートである。流量指示部208は、滞留監視部209が流量制御情報記憶部212に書き込んだ下り滞留メッセージ数と中継装置IDの通知を受けて処理を開始する。先ず、流量指示部208は、中継装置IDに基づいて流量制御情報記憶部212を検索し、対応する閾値を取り出す(S1)。次に、取り出した閾値と滞留監視部209から通知された下り滞留メッセージ数とを比較する(S2)。下り滞留メッセージ数が閾値より大きい場合、送受信情報記憶部204に記憶された中継装置IDの流量指示値に「0」(送信停止)を書き込み(S3)、下り滞留メッセージ数が閾値を超えていなければ、送受信情報記憶部204に記憶された中継装置IDの流量指示値に「1」(送信可能)を書き込む(S4)。
滞留監視部209は定期的に中継装置3から中継装置の下り滞留メッセージ数を受信し、流量制御情報記憶部212に記憶されている当該中継装置の下り滞留メッセージ数を、受信した下り滞留メッセージ数で上書きする。滞留監視部209は、書き込んだ下り滞留メッセージ数を当該中継装置IDとともに、流量制御情報記憶部212に通知する。
図7は、優先制御効果監視部210における追い越しメッセージ数のカウント動作を示すフローチャートである。上り受信部201において優先度が「高」かつメッセージ種別が「応答」のメッセージ(メッセージAと称する)が受信されると、優先制御効果監視部210に当該メッセージAのメッセージIDがされ、処理が開始される。優先制御効果監視部210はメッセージAのメッセージIDに基づいて送受信情報記憶部204を検索し、メッセージAの送信時および受信時のレコードを取り出す(S1)。次に、取出したレコードの時刻データを用いて、送信時刻と受信時刻の差分をメッセージAの応答時間として算出する(S2)。算出した応答時間を既定値と比較し(S3)、当該規定値よりも応答時間が小さい場合、優先制御の効果があると判断し、処理を終了する。算出した応答時間が予め決められた応答時間よりも大きい場合は、優先制御の効果がないと判断し、以下の手順でメッセージAが送信されてから受信されるまでの間に、メッセージAが追い越したメッセージ数をカウントして送信元の中継装置IDとともに閾値調整部211に通知する(S4~S7)。
図8は、閾値調整部の動作を示すフローチャートである。優先制御効果監視部210から中継装置IDと追い越しメッセージ数が通知されると、閾値調整部211は処理を開始する。閾値調整部211は、優先制御効果監視部210から通知された中継装置IDに基づいて流量制御情報記憶部212を検索し、対応する当該中継装置の下り滞留メッセージ数と閾値を取り出す(S1)。次に、取り出した下り滞留メッセージ数と優先制御効果監視部210から通知された追い越しメッセージ数を比較する(S2)。追い越しメッセージ数が下り滞留メッセージ数に予め決められた割合を乗じた数値よりも小さい場合、流量制御情報記憶部212から取り出した閾値をデクリメントし(S3)、デクリメントした値で流量制御情報記憶部212に記憶された閾値を上書きする(S4)。下り滞留メッセージ数に乗じる割合は、追い越しメッセージ数が下り滞留メッセージ数よりも十分に小さいことを確実に判断するための調整値であり、例えば60%といった値に設定する。
Claims (5)
- 通信端末からアプリケーションサーバ宛に送信される上り方向のメッセージを中継装置を介して受信するとともに、前記アプリケーションサーバから前記通信端末宛に送信される下り方向のメッセージを前記中継装置を介して前記通信端末に送信するメッセージ送受信装置であって、
前記中継装置に滞留する下り方向の滞留メッセージの数を前記中継装置から受信し、当該中継装置におけるメッセージの滞留状況を監視する滞留監視部と、
前記滞留監視部が受信した前記滞留メッセージの数と所定の閾値との比較に基づいて、前記メッセージ送受信装置が前記中継装置に送信する前記メッセージの量を指示する流量指示部と、
前記流量指示部からの指示にしたがって、前記中継装置に送信する前記メッセージの量を制御する流量制御部と、
前記メッセージ送受信装置から前記中継装置に送信される前記メッセージに関する情報および、前記中継装置から前記メッセージ送受信装置に送信される前記メッセージに関する情報を保持する送受信情報記憶部と、
優先度の高い高優先度メッセージを受信した際、当該高優先度メッセージが前記中継装置から送信されてから受信されるまでの間、前記高優先度メッセージが追い越したメッセージの数を前記送受信情報記憶部の情報に基づいて算出する優先制御効果監視部と、
前記優先制御効果監視部において算出された前記追い越したメッセージの数に基づいて前記閾値を調整する閾値調整部と、
を具備することを特徴とするメッセージ送受信装置。 - 前記優先制御効果監視部は、
前記高優先度メッセージの直前に前記メッセージ送受信装置が受信した、優先度の低い低優先度メッセージの送信時刻、および前記高優先度メッセージの送信時刻を前記送受信情報保持部から取得し、前記低優先度メッセージの送信時刻から前記高優先度メッセージの送信時刻までの間に前記中継装置から前記メッセージ送受信装置に送信されたメッセージを、前記送受信情報保持部の情報に基づいてカウントすることにより、前記追い越したメッセージの数を算出すること、を特徴とする請求項1記載のメッセージ送受信装置。 - 請求項1または2に記載のメッセージ送受信装置、
スマートメータを備えた前記通信端末、および
前記アプリケーションサーバから構成され、
前記スマートメータの検針データ、および前記アプリケーションサーバの制御データを前記メッセージ送受信装置を介して送受信する自動検針システム。 - 通信端末からアプリケーションサーバ宛に送信される上り方向のメッセージを中継装置を介して受信するとともに、前記アプリケーションサーバから前記通信端末宛に送信される下り方向のメッセージを前記中継装置を介して前記通信端末に送信するメッセージ送受信方法であって、
前記中継装置から送信される前記メッセージの優先度に関する情報を取得し、
優先度の高い高優先度メッセージを受信した際、当該高優先度メッセージが前記中継装置から送信されてから受信されるまでの間、前記高優先度メッセージが追い越したメッセージの数を算出し、
算出された前記追い越したメッセージの数に基づいて、前記中継装置に送信する前記メッセージの量を決定するための閾値を調整し、
前記中継装置に滞留する下り方向の滞留メッセージの数を前記中継装置から受信し、受信した前記滞留メッセージの数を前記閾値と比較した結果に基づいて、前記中継装置に送信する前記メッセージの量を制御することを特徴とするメッセージ送受信方法。 - 前記高優先度メッセージの直前に受信した、優先度の低い低優先度メッセージの送信時刻、および前記高優先度メッセージの送信時刻を取得し、
前記低優先度メッセージの送信時刻から前記高優先度メッセージの送信時刻までの間に前記中継装置から前記メッセージ送受信装置に送信されたメッセージをカウントすることにより、前記追い越したメッセージの数を算出すること、を特徴とする請求項4記載のメッセージ送受信方法。
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