WO2015155996A1 - Appareil et procédé de commande de communication ainsi que support d'enregistrement sur lequel a été mémorisé un programme de commande de communication - Google Patents

Appareil et procédé de commande de communication ainsi que support d'enregistrement sur lequel a été mémorisé un programme de commande de communication Download PDF

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Publication number
WO2015155996A1
WO2015155996A1 PCT/JP2015/002018 JP2015002018W WO2015155996A1 WO 2015155996 A1 WO2015155996 A1 WO 2015155996A1 JP 2015002018 W JP2015002018 W JP 2015002018W WO 2015155996 A1 WO2015155996 A1 WO 2015155996A1
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data
communication
unit
notification
transmission
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PCT/JP2015/002018
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English (en)
Japanese (ja)
Inventor
由明 西川
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日本電気株式会社
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Priority to JP2016512608A priority Critical patent/JP6528768B2/ja
Publication of WO2015155996A1 publication Critical patent/WO2015155996A1/fr

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  • the present invention relates to a technology for controlling communication.
  • packet communication which is generally used in Internet communication
  • packet loss and route change occur on the route.
  • retransmission control and order control are required in order to deliver transmitted data to a receiving terminal in the order of transmission.
  • retransmission control for example, when a transmission acknowledgment (ACK; Acknowledgment) indicating that data has been delivered to the receiving side is not received for a certain period of time, retransmission of the data is started.
  • ACK transmission acknowledgment
  • NACK non-delivery acknowledgment
  • retransmission control for example, when the transmission side receives a non-delivery acknowledgment (NACK) indicating that data has not been delivered to the reception side, retransmission of the data is started.
  • NACK non-delivery acknowledgment
  • retransmission control for example, when the number of received data is changed by a change in order on the receiving side, retransmission of the data whose order has been changed is started.
  • TCP Transmission Control Protocol
  • a transmission side when a transmission side does not receive an ACK for a certain period after transmitting a segment, the segment is retransmitted.
  • a segment is a communication unit in TCP.
  • TCP even when it is determined by duplicate ACK that the number of segments received by changing the order is equal to or greater than a threshold value, the data in which the segments are generated is retransmitted.
  • the specific number of the threshold values varies depending on the OS (Operating System) and settings.
  • TCP when a transmitted segment arrives at the receiving side, if a segment sent before that segment has not arrived at the receiving side, the receiving side of the segment sent before it has not arrived Waiting for arrival. Then, the segments are rearranged in the order of transmission and then passed to a higher-level protocol or application.
  • Patent Document 1 describes a cyclic transmission method that avoids order control by sequentially transmitting different data for each of a plurality of connections.
  • the transmitting apparatus transmits different data in order for each of the established connections.
  • the receiving device can use the arrived data at any time in the application program being executed.
  • the device on the transmission side described in Patent Document 1 identifies the difference between the largest number and the smallest number among the numbers assigned to each segment that is being transmitted via any connection according to the order of transmission. To do. When the identified difference is equal to or larger than the predetermined value, the transmitting side apparatus retransmits the earliest transmitted segment through another connection. Therefore, even if an accidental loss occurs during segment transmission, it is possible to avoid the order control for waiting for retransmission.
  • Patent Document 2 describes a relay node and a destination node connected by an active communication path and a backup communication path.
  • the relay node switches the communication path to be used to the backup communication path. Then, the relay node retransmits the data transmitted between the occurrence of the failure and the completion of the switching of the communication path.
  • JP 2010-056990 A Japanese Patent Laid-Open No. 11-308233
  • switching of communication paths such as handover in a mobile network may cause a situation in which all data transmitted to each communication path is lost over a period sufficiently longer than the transmission interval of intermittently transmitted data.
  • retransmission control is performed in all connections established in that period. Therefore, in the above case, the order control cannot be avoided in the data communication according to the cyclic transmission method as described in Patent Document 1. Therefore, in the technique of Patent Document 1, when all data transmitted by switching the communication path is lost for a period sufficiently longer than the transmission interval of intermittently transmitted data, the communication delay cannot be shortened.
  • the relay node described in Patent Document 2 switches a communication path to be used to a backup communication path, which is the other communication path, when a failure occurs in an active communication path out of two communication paths. Therefore, when a situation occurs in which all data transmitted within a period sufficiently longer than the transmission interval of intermittently transmitted data occurs, not only the communication link via the working communication path but also the communication link via the backup communication path A failure also occurs. Accordingly, in that case, a failure occurs in all communications, so retransmission control is performed in communication links via all communication paths. As described above, in the technique of Patent Document 2, when all data transmitted by switching the communication path is lost for a period sufficiently longer than the transmission interval of intermittently transmitted data, the communication delay cannot be shortened. .
  • One of the objects of the present invention is communication that can reduce communication delay even when all data transmitted by switching the communication path is lost for a period sufficiently longer than the transmission interval of intermittently transmitted data. It is to provide a control device and the like.
  • the communication control device includes a management unit that maintains a plurality of connections to a transmission destination device, and a communication to the transmission destination device that is performed by a data transmission unit via a selected connection selected from the plurality of connections.
  • the data transmission unit and The switching notification is detected within a predetermined period based on the temporary disconnection notification from the switching detection means that detects switching of the communication path with the transmission destination device and detects the completion of the switching. If received, the new selected connection is selected from the plurality of connections other than the selected connection, and the selected connection identifier is selected. And a changing means for transmitting to said data transmission means.
  • the communication control method maintains a plurality of connections to a destination device, and communication with the destination device performed by a data transmission unit via a selected connection selected from the plurality of connections is interrupted.
  • the data transmission unit and the transmission destination When the switching notification is received within a predetermined period based on the temporary disconnection notification from the switching detection unit that detects switching of the communication path with the device and detects the completion of the switching when the switching is detected. , Selecting a new selected connection from the plurality of connections other than the selected connection, and specifying an identifier of the selected selected connection as the data To send to the signal means.
  • the recording medium includes: a management unit that maintains a plurality of connections to a transmission destination device; and a transmission destination device that a data transmission unit performs via a selected connection selected from the plurality of connections.
  • the data transmission The switching is detected within a predetermined period based on the temporary disconnection notification from the switching detection unit that detects switching of the communication path between the unit and the destination device and transmits a switching notification when the completion of the switching is detected.
  • a new selected connection is selected from the plurality of connections other than the selected connection, and the selected selection connection is selected.
  • the present invention can also be realized by a communication control program stored in the recording medium.
  • FIG. 1 is a diagram illustrating an example of a configuration of a communication system 10 according to the first and second embodiments of the present invention.
  • FIG. 2 is a flowchart illustrating an example of an operation of detecting the occurrence of a temporary disconnection in the second communication device 2 of the first and second embodiments.
  • FIG. 3 is a flowchart illustrating an example of an operation when the communication control device 3 according to the first and second embodiments receives a temporary disconnection notification.
  • FIG. 4 is a block diagram illustrating an example of a configuration of a communication system 10B according to the third exemplary embodiment of the present invention.
  • FIG. 5 is a block diagram illustrating an example of the operation of the second communication device 2B according to the third embodiment.
  • FIG. 6 is a flowchart illustrating an example of the operation of the communication control device 3B of the third embodiment.
  • FIG. 7 is a block diagram illustrating an example of a configuration of a communication system 10A according to a modification of the first embodiment.
  • FIG. 8 is a diagram illustrating an example of the configuration of the communication control device 3C according to the fourth embodiment of the present invention.
  • FIG. 9 is a diagram illustrating an example of a configuration of a computer 1000 that can realize the communication control device and the communication device according to the present invention.
  • FIG. 1 is a diagram illustrating an example of a configuration of a communication system 10 according to the present embodiment.
  • a communication system 10 includes a first communication device 1 and a second communication device 2.
  • the 1st communication apparatus 1 and the 2nd communication apparatus 2 are connected so that communication is possible.
  • the communication path connecting the first communication device 1 and the second communication device 2 is switched irregularly, for example.
  • the first communication device 1 and the second communication device 2 are connected by wireless communication via a base station. Then, when a handover is performed due to movement of the first communication device 1 or the second communication device 2, the communication path that connects the first communication device 1 and the second communication device 2 is switched.
  • the first communication device 1 and the second communication device 2 perform connection-type communication, which is communication performed in a state where a connection that is a virtual dedicated communication path is established.
  • An example of connection-type communication performed between the first communication device 1 and the second communication device 2 is communication using TCP. Communication performed between the first communication device 1 and the second communication device 2 may not be communication by TCP.
  • the first communication device 1 is also referred to as a transmission device.
  • the second communication device 2 is also expressed as a transmission destination device.
  • the first communication device 1 includes a data transmission unit 101 and a communication control device 3.
  • the communication control device 3 includes a management unit 102, a changing unit 103, a notification receiving unit 104, and a switching detection unit 105.
  • the management unit 102, the change unit 103, the notification reception unit 104, and the switching detection unit 105 may be components of the first communication device 1.
  • the management unit 102, the change unit 103, the notification reception unit 104, and the switch detection unit 105 may operate as the communication control device 3.
  • the second communication device 2 includes a data reception unit 201, a determination unit 202, and a notification transmission unit 203.
  • the data transmission unit 101 transmits data at a predetermined timing.
  • the data transmission unit 101 may transmit data at a predetermined interval.
  • the management unit 102 manages a plurality of connections established in the first communication device 1.
  • the management unit 102 manages a plurality of connections including connections used for data transmission.
  • the management of the connection is, for example, performing a process for maintaining the established state so that the connection is not disconnected.
  • the data reception unit 201 receives data transmitted by the data transmission unit 101 of the first communication device 1.
  • the determination unit 202 When the time interval at which the data reception unit 201 receives data exceeds a predetermined threshold, the determination unit 202 has a “communication channel temporary disconnection” in which the communication channel is temporarily disconnected. Is determined. In the description of this embodiment and other embodiments, the communication path temporary interruption is also referred to as “temporary interruption”.
  • the notification transmission unit 203 sends a “communication path temporary disconnection notification” that is a notification indicating that the communication path temporary disconnection has occurred. Transmit to the first communication device 1.
  • the communication path temporary interruption notification is also referred to as “temporary interruption notification”.
  • the notification reception unit 104 receives a communication path temporary disconnection notification from the notification transmission unit 203 of the second communication device 2.
  • the switching detection unit 105 monitors the switching of the communication path. For example, the switching detection unit 105 may always monitor switching of the communication path. Then, the switching detection unit 105 detects the completion of switching of the communication path.
  • the change unit 103 is used for data transmission from a plurality of connections managed by the management unit 102 when the notification reception unit 104 receives the temporary disconnection notification and the switching detection unit 105 detects completion of switching of the communication path. Select a connection that is not connected. In the description of the present embodiment, the selected connection is also referred to as a selected connection.
  • the changing unit 103 designates the selected connection as a connection used for data transmission. For example, the changing unit 103 may designate the selected connection as a connection used for data transmission by transmitting the identifier of the selected connection to the data transmitting unit 101. In this case, for example, when receiving the connection identifier, the data transmission unit 101 may be designed to change the connection used for data transmission to the connection specified by the received identifier. In the following description, the connection used by the data transmission unit 101 for data transmission is also referred to as a transmission connection.
  • FIG. 2 is a flowchart showing an example of an operation of detecting the occurrence of a temporary disconnection in the second communication device 2 of the present embodiment.
  • the data transmission unit 101 of the first communication device 1 transmits data.
  • the data transmission unit 101 may transmit data by any transmission method based on TCP, for example.
  • the data transmission unit 101 transmits data at predetermined time intervals.
  • the data receiving unit 201 receives the data transmitted by the data transmitting unit 101 (step S102).
  • a method for receiving data by the data receiving unit 201 may be any method that can receive data transmitted by the data transmitting unit 101. For example, when the data transmission unit 101 transmits data based on TCP, the data reception unit 201 may receive the transmitted data similarly based on TCP. The data receiving unit 201 may transmit the time when the data is received to the determination unit 202. When the data receiving unit 201 receives the data, for example, the data receiving unit 201 may transmit a notification indicating that the data has been received to the determining unit 202.
  • the determination unit 202 may regard the time when the notification indicating that the data has been received is received as the time when the data reception unit 201 receives the data.
  • the communication control device 3 performs the operation of step S103.
  • the determination unit 202 determines whether or not the data reception interval, which is the time interval at which the data reception unit 201 receives the data, exceeds a threshold (step S103).
  • the determination unit 202 only needs to store the time when the data reception unit 201 last received data. And the determination part 202 should just specify the time which passed since the data reception part 201 received the data last.
  • the determination unit 202 may determine that the data reception interval exceeds the threshold. As described above, when it is determined that the data reception interval exceeds the threshold, the determination unit 202 determines that a temporary interruption has occurred.
  • the determination unit 202 may determine that the data reception interval does not exceed the threshold. If it is determined that the data reception interval does not exceed the threshold value, the determination unit 202 determines that no interruption has occurred. The determination unit 202 may determine whether the data reception interval exceeds a predetermined threshold based on the stored time and the time when the data reception unit 201 newly receives data. The above threshold value may be given in advance. Alternatively, for example, the determination unit 202 may determine the above-described threshold based on an interval at which the data reception unit 201 receives data within a predetermined period.
  • the second communication device 2 next performs the operation of step S101.
  • the data receiving unit 201 waits for the next data transmitted from the first communication device 1.
  • step S104 the notification transmission unit 203 transmits a temporary disconnection notification to the notification reception unit 104 (step S104). Then, the second communication device 2 ends the operation shown in FIG. After the operation in step S104, the operation of the second communication device 2 may return to step S102.
  • FIG. 3 is a flowchart showing an example of the operation when the communication control device 3 of the present embodiment receives a temporary disconnection notification.
  • the communication control device 3 performs the operation shown in FIG.
  • the switching detection unit 105 of the communication control device 3 monitors a communication path used in communication between the first communication device 1 and the second communication device 2. When the switching of the communication path used in the communication between the first communication device 1 and the second communication device 2 occurs, the switching detection unit 105 detects the completion of the switching.
  • the notification reception unit 104 receives the temporary suspension notification (step S111).
  • the notification receiving unit 104 may transmit the received temporary disconnection notification to the changing unit 103.
  • the changing unit 103 that has received the temporary suspension notification identifies the time based on the temporary suspension notification, and sets the identified time as the reference time.
  • the time based on the temporary suspension notification may be, for example, the time when the changing unit 103 receives the temporary suspension notification.
  • the time based on the temporary disconnection notification may be, for example, the time when the notification receiving unit 104 receives the temporary disconnection notification.
  • the time based on the temporary suspension notification may be the time at which the temporary suspension notification is transmitted. In that case, the notification transmission unit 203 may transmit the transmission time of the temporary suspension notification to the notification reception unit 104 in addition to the temporary suspension notification.
  • the time based on the temporary disconnection notification may be the time when the determination unit 202 determines that the temporary disconnection has occurred.
  • the determination unit 202 may transmit a data value representing the time at which it was determined that a temporary interruption has occurred to the notification transmission unit 203. Then, in addition to the temporary disconnection notification, the notification transmission unit 203 may transmit a data value representing the time when it is determined that the temporary disconnection has occurred to the notification reception unit 104.
  • the changing unit 103 sets a detection period based on the reference time. Then, the changing unit 103 determines whether or not switching of the communication path is detected within the detection period (step S112).
  • the detection period is a period determined based on the reference time, for example.
  • the length of the detection period may be a period of a predetermined length.
  • the changing unit 103 may set, for example, a reference time or a time that is a predetermined time before the reference time as the start time of the detection period. And the change part 103 should just set the time after predetermined time rather than reference
  • the length of the detection period may not be determined.
  • the changing unit 103 may set, for example, a reference time or a time that is a predetermined time before the reference time as the start time of the detection period.
  • the changing unit 103 may set the maximum value that can be set as the time as the end time of the detection period.
  • the changing unit 103 may not determine the end time of the detection period. Since the reference time is a time based on the temporary suspension notification, the detection period can be regarded as a period determined based on the temporary suspension notification.
  • switching of the communication path also occurs, for example, when the wireless base station that relays wireless communication is switched.
  • a device that communicates by radio has information that identifies a radio base station that relays communication.
  • the switching detection unit 105 may detect the switching of the communication path by detecting a change of a wireless base station that relays wireless communication performed by the first communication device 1.
  • the switching detection unit 105 may detect the switching of the communication path by a method according to the type of the communication line to which the first communication device 1 is connected.
  • step S112 If the switching of the communication path is not detected within the detection period (No in step S112), the communication control device 3 next performs the operation of step S111. That is, the notification receiving unit 104 waits for a temporary disconnection notification to be transmitted next.
  • the communication control device 3 When the end time is set in the detection period corresponding to the reception of the temporary disconnection notification and the switching of the communication path is not detected within the detection period, the communication control device 3 performs processing based on the temporary disconnection notification. Absent. That is, when the switching of the communication path is not detected within the detection period corresponding to reception of the temporary disconnection notification, the communication control device 3 ignores the temporary disconnection notification.
  • the changing unit 103 When switching of the communication path is detected within the detection period (Yes in step S112), the changing unit 103 is a transmission connection that is a connection used by the data transmitting unit 101 to transmit data to the second communication device 2. Is changed (step S113). And the communication control apparatus 3 complete
  • the change unit 103 waits for detection of switching of the communication path by the switching detection unit 105. In that case, the change unit 103 switches the communication path whenever the switching of the communication path is detected whenever the temporary disconnection notification is received.
  • This embodiment has an effect that communication delay can be reduced even when all data is lost due to switching of the communication path for a period sufficiently longer than the transmission interval of intermittently transmitted data.
  • the change unit 103 changes the transmission connection after the switching detection unit 105 detects the completion of the switching of the communication path. is there.
  • the transmitted data is lost in the connection in which the data is transmitted before the switching of the communication path is completed, so the order control is performed.
  • the transmission connection is switched before the switching of the communication path is completed, data is transmitted through the transmission connection after the switching, and all the transmitted data is lost. Therefore, order control is also performed in the transmission connection after switching. If each of the plurality of connections is sequentially switched to the transmission connection before the switching of the communication path is completed, the order control is performed on all of the plurality of connections. Therefore, even if the switching of the communication path is completed, the sequence control is performed in all of the plurality of connections, so that further delay occurs in the communication.
  • the order control is performed except for the connection set as the transmission connection when the switching of the communication path is performed. Not implemented. Therefore, the order control is not performed on the changed transmission connection after the completion of the switching of the communication path is detected. Therefore, there is no communication delay caused by the order control. Therefore, in this embodiment, communication delay can be shortened.
  • FIG. 1 is a diagram illustrating a configuration of a communication system 10 according to the present embodiment.
  • the configuration of the communication system 10 according to the present embodiment is the same as the configuration of the communication system 10 according to the first embodiment. Below, it demonstrates focusing on the difference between this embodiment and 1st Embodiment.
  • the data transmission unit 101 transmits a transmission time that is a time at which the data is transmitted in addition to the data to be transmitted.
  • the data transmission unit 101 may add transmission time data that is data representing the transmission time of the data to the transmission data that is data to be transmitted. Then, the data transmission unit 101 may transmit the transmission data to which the transmission time data is added to the second communication device 2.
  • the data reception unit 201 of the second communication device 2 transmits the transmission time data added to the received transmission data to the determination unit 202.
  • the determination unit 202 stores the transmission time data added to the transmission data last received by the data reception unit 201.
  • the determination unit 202 determines whether the data reception interval exceeds a threshold, as in the determination unit 202 of the first embodiment.
  • the determination unit 202 stores the transmission time data transmitted in addition to the newly received transmission data as the last received transmission data.
  • the determination unit 202 transmits the stored transmission time data added to the last received transmission data to the notification transmission unit 203.
  • the notification transmission unit 203 transmits the transmission time data stored in the determination unit 202 in addition to the temporary disconnection notification. In that case, the notification transmission unit 203 may add transmission time data to the temporary disconnection notification. And the notification transmission part 203 should just transmit the temporary stop notification to which transmission time data was added.
  • the notification reception unit 104 receives transmission time data from the notification transmission unit 203 in addition to the temporary disconnection notification.
  • the notification receiving unit 104 only has to receive the temporary disconnection notification to which the transmission time data is added as described above.
  • the changing unit 103 sets the time represented by the transmission time data received by the notification receiving unit 104 as the start time of the detection period.
  • the transmission time data may be a data value representing the transmission time.
  • the transmission time data may be, for example, a sequence number or ID (Identifier) assigned to each of the transmitted data, which can specify the order of transmission.
  • the transmission time data may be, for example, a data reception time that is a time when the data receiving unit 201 receives the data.
  • the changing unit 103 may hold, for example, the transmission time and sequence number of the data for which the transmission time is specified and the transmission interval in advance.
  • the transmission time of data for which the transmission time is specified and held by the changing unit 103 is referred to as a reference transmission time.
  • the sequence number of the data for which the transmission time is specified and held by the changing unit 103 is referred to as a reference sequence number.
  • the reference sequence number may be an initial value of the sequence number.
  • the reference transmission time may be a time at which data with an initial sequence number is transmitted.
  • the changing unit 103 may acquire the initial value of the sequence number, the transmission time of the data to which the sequence number that is the initial value, and the transmission interval are obtained from the data transmitting unit 101 in advance.
  • the changing unit 103 may specify the number of times data is transmitted after the reference time based on the difference between the sequence number received by the notification receiving unit 104 and the reference sequence number. Based on the number of times the data has been updated since the reference time and the transmission interval at which the data is transmitted, the changing unit 103 has transmitted the data to which the sequence number received by the notification receiving unit 104 is added from the reference time What is necessary is just to estimate the time elapsed until the time.
  • the changing unit 103 assigns the sequence number received by the notification receiving unit 104 based on the sequence number received by the notification receiving unit 104 as the transmission time data, the reference transmission time and the reference sequence number, and the transmission interval. Estimate the time when the transmitted data was transmitted.
  • the notification transmitting unit 203 transmits a data value representing the reception time, which is the time when the data receiving unit 201 receives the data, as the transmission time data
  • the changing unit 103 is more than the time represented by the received transmission time data.
  • the time before the delay time may be estimated as the transmission time.
  • the delay time may be a representative value of the time required for data transmission from the first communication device 1 to the second communication device 2.
  • the representative value may be, for example, an average value, an intermediate value, or another statistical value derived experimentally.
  • FIG. 2 is a flowchart showing an example of an operation of detecting the occurrence of a temporary disconnection in the second communication device 2 of the present embodiment.
  • step S101 When the data is transmitted to the data receiving unit 201 (Yes in step S101), the data receiving unit 201 receives the data to which the transmission time data is added (step S102). When data is not transmitted to the data receiving unit 201 (No in step S101), the communication control device 3 next performs the operation of step S103.
  • step S103 The operation of the determination unit 202 in step S103 is the same as the operation in step S103 of the determination unit 202 of the first embodiment.
  • the determination unit 202 only needs to store the time when the data reception unit 201 last received data.
  • step S ⁇ b> 103 the determination unit 202 determines whether the data reception interval exceeds the threshold value by comparing the threshold value with the time elapsed since the data reception unit 201 last received the data. do it. Whether the data reception interval exceeds the threshold value is determined by comparing the threshold value with the time elapsed from the stored time to the time when the data receiving unit 201 newly received the data. It may be determined.
  • step S103 If the data reception interval does not exceed the predetermined threshold (No in step S103), the communication control device 3 next performs the operation of step S101. Then, the data receiving unit 201 continues to receive data.
  • the notification transmission unit 203 transmits transmission time data in addition to the temporary disconnection notification (step S104). ).
  • FIG. 3 is a flowchart showing an example of the operation when the communication control device 3 of the present embodiment receives a temporary disconnection notification.
  • the notification receiving unit 104 receives, for example, a temporary suspension notification and transmission time data added to the temporary suspension notification. (Step S111).
  • the switching detection unit 105 determines the detection period. First, the switch detection unit 105 identifies the time represented by the transmission time data received by the notification reception unit 104. The switch detection unit 105 sets the specified time as the start time of the detection period. The switching detection unit 105 determines the end time of the detection period according to a predetermined determination method. For example, the switching detection unit 105 may determine the end time of the detection period by any one of the methods for determining the end time of the detection period in the first embodiment.
  • step S112 When the switching detection unit 105 detects switching of the communication path within the detection period (Yes in step S112), the changing unit 103 changes the transmission connection in the same manner as the changing unit 103 of the first embodiment (step S113). ). If the switching detection unit 105 detects switching of the communication path within the detection period (No in step S112), the communication control device 3 next performs, for example, the operation of step S111.
  • This embodiment has the same effect as the first embodiment.
  • the reason is the same as the reason for the effect of the first embodiment.
  • This embodiment has a second effect that communication delay can be further reduced.
  • the change unit 103 changes the transmission connection when the switching of the communication path is detected in the detection period in which the transmission time of the last transmitted data or the estimated time of the transmission time is the start time. It is. Therefore, even when the fluctuation of the period during which all transmitted data is lost is large, the period can be specified more accurately. Therefore, the sequence control can be avoided more reliably, and the communication delay can be shortened. In addition, since the lost data can be accurately grasped, only the lost data can be transmitted through the changed transmission connection. Therefore, communication delay can be further reduced.
  • FIG. 4 is a block diagram illustrating an example of the configuration of the communication system 10B according to the present embodiment.
  • the communication system 10B includes a first communication device 1B and a second communication device 2B.
  • the first communication device 1B and the second communication device 2B can communicate with each other.
  • the first communication device 1B includes a data transmission unit 101 and a communication control device 3B.
  • the communication control device 3B includes a management unit 102, a change unit 103, a delivery confirmation reception unit 106, a determination unit 107, and a switching reception unit 108.
  • the second communication device 2B includes a data reception unit 201, a delivery confirmation transmission unit 204, a switching detection unit 205, and a switching transmission unit 206.
  • the data transmission unit 101 and the data reception unit 201 operate in the same manner as the data transmission unit 101 and the data reception unit 201 of the first embodiment, respectively.
  • the management unit 102 manages a plurality of connections established between the first communication device 1B and the second communication device 2B, as with the management unit 102 of the first embodiment.
  • the delivery confirmation transmission unit 204 transmits a delivery confirmation regarding the data to the first communication device 1B.
  • the delivery confirmation may be, for example, a predetermined data value or signal.
  • the delivery confirmation receiving unit 106 receives the delivery confirmation from the delivery confirmation transmitting unit 204 of the second communication device 2B. When the delivery confirmation is received, the delivery confirmation receiving unit 106 transmits, for example, the time when the delivery confirmation is received to the determination unit 107.
  • the determination unit 107 stores the time when the delivery confirmation receiving unit 106 last received the delivery confirmation.
  • the delivery confirmation receiving unit 106 receives the delivery confirmation based on the stored time and the newly received time.
  • the interval to be derived is derived.
  • the determination unit 107 determines whether the interval at which the delivery confirmation receiving unit 106 receives the delivery confirmation exceeds a predetermined threshold.
  • the judging unit 107 determines that a communication path temporary interruption has occurred.
  • the determination unit 107 transmits a temporary suspension notification to the change unit 103.
  • the switching detection unit 205 monitors switching of the communication path used for data transmission between the first communication device 1B and the second communication device 2B, as with the switching detection unit 105 of the first embodiment. To do. Then, the switching detection unit 205 detects the completion of switching of the communication path.
  • the switching transmission unit 206 transmits a switching notification to the first communication device 1B when the switching detection unit 205 detects the completion of switching of the communication path.
  • the switching notification may be, for example, a predetermined data value or signal.
  • the switch receiving unit 108 receives a switch notification from the second communication device 2B.
  • the change unit 103 receives a temporary disconnection notification from the determination unit 107.
  • the changing unit 103 sets the time at which the suspension notification is received as the reference time.
  • the change unit 103 may set the time at which the determination unit 107 determines that a communication path temporary interruption has occurred as the reference time. In that case, the changing unit 103 may receive the time when the determining unit 107 determines that the communication path temporary interruption has occurred from the determining unit 107.
  • the change part 103 sets a detection period based on reference
  • the switching receiving unit 108 receives a switching notification within the set detection period
  • the changing unit 103 changes the transmission connection in the same manner as the changing unit 103 of the first embodiment.
  • FIG. 5 is a block diagram illustrating an example of the operation of the second communication device 2B of the present embodiment.
  • the data transmission unit 101 of the first communication device 1B transmits data to the second communication device 2B.
  • the data receiving unit 201 receives data (step S201).
  • the delivery confirmation transmitting unit 204 transmits a delivery confirmation to the first communication device 1B (step S202).
  • the switching detection unit 205 monitors the switching of the communication path between the first communication device 1B and the second communication device 2B. Then, the switching detection unit 205 detects completion of switching of the communication path. If switching of the communication path is not detected by the switching detection unit 205 (No in step S203), the second communication device 2B next performs, for example, the operation of step S201. Then, the data receiving unit 201 waits until the next data is sent. When switching of the communication path is detected by the switching detection unit 205 (Yes in step S203), the switching detection unit 205 transmits a switching notification to the first communication device 1B (step S204).
  • FIG. 6 is a flowchart showing an example of the operation of the communication control device 3B of the present embodiment.
  • the data transmission unit 101 transmits data to the second communication device 2B.
  • the 2nd communication apparatus 2B which received data returns the delivery confirmation of the received data to the 1st communication apparatus 1B.
  • Step S211 When the data delivery confirmation is transmitted to the delivery confirmation receiving unit 106 (Yes in Step S211), the delivery confirmation receiving unit 106 receives the delivery confirmation from the second communication device 2B (Step S212). The delivery confirmation receiving unit 106 transmits the time when the delivery confirmation is received to the determination unit 107. When the data delivery confirmation is not transmitted to the delivery confirmation receiving unit 106 (No in step S211), the communication control device 3B next performs the operation of step S213.
  • the determination unit 107 stores the time when the delivery confirmation receiving unit 106 last received the delivery confirmation. For example, the determination unit 107 may specify the time that has elapsed since the time when the delivery confirmation receiving unit 106 last received the delivery confirmation. And the determination part 107 should just compare the time which passed since the time when the delivery confirmation receiving part 106 received the delivery confirmation last, and a predetermined threshold value. When the time elapsed from the time when the delivery confirmation receiving unit 106 last received the delivery confirmation exceeds the threshold, the determination unit 107 may determine that the reception interval of the delivery confirmation exceeds the threshold.
  • the determination unit 107 may determine that the delivery confirmation reception interval does not exceed the threshold.
  • the determination unit 107 receives a delivery confirmation newly received from the delivery confirmation reception unit 106, the determination unit 107 receives the delivery confirmation, which is the difference between the time when the delivery confirmation is received and the stored time when the delivery confirmation is received.
  • the interval may be derived.
  • the determination unit 107 may determine whether the reception interval of the derived delivery confirmation exceeds a predetermined threshold value.
  • the communication control device 3B next performs the operation of step S211.
  • the delivery confirmation receiving unit 106 waits until the next delivery confirmation is transmitted.
  • Step S214 the determination unit 107 determines that a communication path temporary interruption has occurred.
  • the changing unit 103 sets the detection period as described above. Then, the changing unit 103 determines whether or not switching of the communication path is detected within the detection period (step S215). For example, when the switching reception unit 108 receives a switching notification within the detection period, the changing unit 103 may determine that switching of the communication path has been detected within the detection period. For example, when the switching reception unit 108 does not receive the switching notification within the detection period, the changing unit 103 may determine that the switching of the communication path has not been detected within the detection period.
  • step S215 the communication control device 3B next performs, for example, the operation of step S211.
  • the changing unit 103 changes the transmission connection as in the first embodiment (step S216).
  • This embodiment has the same effects as those of the first embodiment even when the second communication device 2B that receives data cannot determine whether or not communication is temporarily interrupted.
  • the reason is that the delivery confirmation transmission unit 204 transmits a delivery confirmation to the first communication device 1B in response to the data reception by the data reception unit 201. This is because the changing unit 103 determines whether or not a communication interruption has occurred based on the reception confirmation reception interval transmitted by the delivery confirmation transmitting unit 204.
  • This embodiment further has the same effect as the first embodiment even when the first communication device 1B that transmits data cannot detect the completion of the switching of the communication path.
  • the switching transmission unit 206 transmits a switching notification to the first communication device 1B. Because. Then, the change unit 103 determines that the communication path has been switched within the detection period when the switching reception unit 108 receives the switching notification within the detection period.
  • the switching detection unit 205 may be included in a switching detection device that is not illustrated in FIGS. 1 and 4.
  • the switch detection unit 205 of the switch detection device may transmit a switch notification to the first communication device 1.
  • the communication control apparatus 3 should just further include the switch receiving part 108 similarly to the communication control apparatus 3B of 3rd Embodiment.
  • the switch detection unit 205 of the switch detection device may transmit a switch notification to the first communication device 1B.
  • the communication control device 3 is included in the first communication device 1.
  • the communication control device 3 may be included in the second communication device 2.
  • some of the components of the communication control device 3 may be included in the first communication device 1.
  • the component of the communication control apparatus 3 except the component contained in the 1st communication apparatus 1 may be contained in the 2nd communication apparatus 2.
  • the communication control device 3B is included in the first communication device 1B.
  • the communication control device 3B may be included in the second communication device 2B.
  • some of the components of the communication control device 3B may be included in the first communication device 1B.
  • the component of the communication control apparatus 3B except the component contained in the 1st communication apparatus 1B may be contained in the 2nd communication apparatus 2B.
  • the second communication device 2 may include the management unit 102 and the change unit 103 instead of the first communication device 1. In that case, the notification transmission unit 203 and the notification reception unit 104 are not necessary. And the 1st communication apparatus 1 should just contain the below-mentioned switching transmission part 109. FIG. And the 2nd communication apparatus 2 should just contain the switching receiving part 207 mentioned later.
  • the switching detection unit 105 detects completion of switching of the communication path
  • the switching transmission unit 109 transmits a switching notification indicating that the switching of the communication path is completed.
  • the switch receiving unit 207 receives the switch notification transmitted by the switch transmitting unit 109.
  • the change unit 103 included in the second communication device 2 newly creates a transmission connection when the switch transmission unit 109 receives a switch notification within the detection period set in the same manner as the change unit 103 of the first embodiment. Decide which connection to use.
  • the second communication device 2 may further include a change instruction unit 208 that transmits an instruction to use the determined transmission connection for transmission to the first communication device 1.
  • the data transmission unit 101 may change the transmission connection in accordance with the instruction received from the change instruction unit 208.
  • FIG. 7 is a block diagram illustrating an example of a configuration of a communication system 10A according to a modification of the first embodiment.
  • the second communication device 2A includes the communication control device 3A.
  • the first communication device 1A includes a data transmission unit 101, a switching detection unit 105, and a switching transmission unit 109.
  • the second communication device 2A includes a data receiving unit 201 and a communication control device 3A.
  • the communication control device 3A includes a management unit 102, a change unit 103, a determination unit 202, a switching reception unit 207, and a change instruction unit 208.
  • the notification transmission unit 203 may transmit the temporary interruption notification a plurality of times within a predetermined transmission period instead of once.
  • the transmission period may be a fixed period determined in advance.
  • the transmission period may be a period until the data receiving unit 201 receives data after the determining unit 202 determines that a communication path temporary interruption has occurred.
  • the transmission period is a statistical amount derived from a round trip delay time between the first communication device 1 and the second communication device 2 measured in advance or from the round trip delay time measured in the past. May be.
  • the statistic is, for example, an average value, an intermediate value, or a median value.
  • the notification transmission unit 203 may include an identifier that identifies the determination of the occurrence of the communication path temporary disconnection based on the temporary disconnection notification. .
  • the delivery confirmation receiving unit 106 detects delivery confirmation based on the lower-layer communication protocol. May be.
  • the first communication device 1B may not include the delivery confirmation receiving unit 106.
  • the second communication device 2 may not include the delivery confirmation transmission unit 204.
  • the 1st communication apparatus 1 may contain the delivery confirmation part which detects the delivery confirmation in the lower layer communication protocol in which delivery confirmation is performed.
  • TCP is an example of a communication protocol in which delivery confirmation is performed as described above.
  • the first communication device 1 and the second communication device 2 are communication terminals having a central processing unit, a memory, a storage device, and a network connection function.
  • the first communication device 1 is, for example, a portable communication terminal device connected via a base station to a mobile network that is communicably connected to the Internet.
  • the first communication device 1 moves due to the movement of the user who holds the first communication device 1.
  • the base station to which the first communication device 1 is connected is switched.
  • the switching detection unit 105 detects switching of the base station to which the first communication device 1 is connected in the mobile network as switching of the communication path.
  • the second communication device 2 is, for example, a server disposed on the Internet.
  • the second communication device 2 does not move.
  • the second communication device 2 does not detect switching of the communication network.
  • the first communication device 1 and the second communication device 2 maintain two TCP connections that connect each other so that they can communicate with each other. Data transfer is directly performed between the first communication device 1 and the second communication device 2 using a TCP connection.
  • TCP connection A one of those two TCP connections
  • TCP connection B the other one of the two TCP connections
  • the first communication device 1 continues to transmit data to the second communication device 2 using the TCP connection A at intervals of, for example, 100 milliseconds.
  • the first communication device 1 performs connection management processing in order to maintain a state in which a TCP connection B that is not used for data transmission is established.
  • the first communication device 1 transmits a keep alive message using a TCP connection, for example, every 300 milliseconds.
  • the keep alive message is not data intended to exchange data between communication devices, but data intended to maintain a connection established state.
  • the second communication device 2 is set to determine that a communication interruption, which is a state in which the communication path is temporarily disconnected, occurs when the data reception interval exceeds 5 seconds. For example, the data (n + 1) as the (n + 1) th data arrives at the second communication device 2 even after 5 seconds have elapsed since the second communication device 2 received the data n as the nth data. If not, the second communication device 2 determines that a communication path temporary interruption has occurred. If the second communication device 2 determines that a communication path temporary interruption has occurred, the second communication apparatus 2 transmits, for example, text data “Ichijidan” to the first communication apparatus 1 as a temporary interruption notification.
  • the temporary disconnection notification is not limited to the text data described above.
  • the temporary interruption notification may be data determined in advance.
  • the first communication device 1 is set to change the transmission connection when, for example, the difference between the time when the temporary disconnection notification is received and the time when the completion of the switching of the communication path is detected is within one second. Yes. For example, when the first communication device 1 detects the completion of the switching of the communication channel and receives a temporary disconnection notification 100 milliseconds after the detection, the first communication device 1 uses the TCP connection B instead of the TCP connection A as the transmission connection. Decide to do.
  • the first communication device 1B and the second communication device 2B are communication terminals having a central processing unit, a memory, a storage device, and a network connection function.
  • the first communication device 1B is a server arranged on the Internet.
  • the first communication device 1B does not move.
  • the 1st communication apparatus 1B cannot detect switching of a communication path.
  • the second communication device 2B is a portable communication terminal device connected via a base station to a mobile network that is communicably connected to the Internet. As the second communication device 2B moves, the base station of the mobile network to which the second communication device 2B is connected is switched. The second communication device 2B detects the switching of the mobile network base station as the switching of the communication path.
  • TCP connections are maintained between the first communication device 1B and the second communication device 2B.
  • Data transfer between the first communication device 1B and the second communication device 2B is performed directly via a TCP connection.
  • TCP connection A one of these two TCP connections
  • TCP connection B The other of the two TCP connections
  • the first communication device 1B continues to transmit data to the second communication device 2B using the TCP connection A at predetermined intervals.
  • the predetermined interval is 100 milliseconds.
  • the second communication device 2B receives, for example, data 1 as the first data from the first communication device 1B
  • the second communication device 2B displays a delivery confirmation 1 indicating that the data 1 has been delivered to the first communication device 1B.
  • Reply to The first communication device 1B receives the returned delivery confirmation 1.
  • the data transmission and the delivery confirmation reply are performed for the data after the data 2 representing the second data.
  • the first communication device 1B performs connection management processing in order to maintain a state in which the TCP connection B that is not used for data transmission is established. As the connection management process, the first communication device 1B transmits a keep-alive message to the second communication device 2B using the TCP connection B every 300 milliseconds, for example.
  • the first communication device 1B receives the data (n + 1) th data (n + 1) transmitted in the same manner within a predetermined time after receiving the delivery confirmation n of the data n which is the nth data being transmitted ( If the delivery confirmation (n + 1) of (n + 1) does not arrive, it is determined that a communication path temporary interruption has occurred.
  • the predetermined time is, for example, 5 seconds. In that case, if the first communication apparatus 1B has not received the delivery confirmation (n + 1) of the data (n + 1) even after 5 seconds have elapsed after receiving the delivery confirmation n of the data n, the communication path is temporarily interrupted. It is determined that it has occurred.
  • the second communication device 2B When the second communication device 2B detects completion of switching of the communication path, the second communication device 2B transmits a switching notification to the first communication device 1B.
  • the switching notification may be, for example, text data such as “Tsushirinkokire”.
  • the switching notification may be data determined in advance.
  • the first communication device 1B changes the transmission connection when, for example, the difference between the time when it is determined that the communication path is temporarily interrupted and the time when the switching notification is received is within a predetermined time.
  • the predetermined time is, for example, 1 second.
  • the first communication device 1B determines TCP connection B that is not a transmission connection as a new transmission connection. That is, the first communication device 1B determines to use the TCP connection B in order to transmit data.
  • FIG. 8 is a diagram illustrating an example of the configuration of the communication control device 3C according to the present embodiment.
  • the communication control device 3 ⁇ / b> C of the present embodiment includes a management unit 102 and a change unit 103.
  • the management unit 102 maintains a plurality of connections to the transmission destination device.
  • the changing unit 103 receives a switching notification from the switching detection unit 105 within a predetermined period based on the temporary disconnection notification. Select a new selected connection from the connections. Then, the change unit 103 transmits the selected connection identifier to the data transmission unit 101.
  • the determination unit 202 detects a temporary interruption that is a state where communication with the transmission destination device performed by the data transmission unit 101 via a selected connection selected from a plurality of connections is interrupted, and responds to detecting the temporary interruption Send a suspension notice.
  • the switch detection unit 105 detects the switching of the communication path between the data transmission unit 101 and the transmission destination device, and transmits a switch notification when the completion of the switch is detected.
  • This embodiment has the same effect as the first embodiment.
  • the reason is the same as the reason for the effect of the first embodiment.
  • the communication apparatus can be realized by a computer and a program for controlling the computer, dedicated hardware, or a combination of a program for controlling the computer and the computer and dedicated hardware.
  • the communication device includes a first communication device 1, a first communication device 1A, a first communication device 1B, a second communication device 2, a second communication device 2A, and a second communication.
  • FIG. 9 is a diagram illustrating an example of a configuration of a computer 1000 that can realize the communication apparatus according to the embodiment of the present invention.
  • a computer 1000 includes a processor 1001, a memory 1002, a storage device 1003, and an I / O (Input / Output) interface 1004.
  • the computer 1000 can access the recording medium 1005.
  • the memory 1002 and the storage device 1003 are storage devices such as a RAM (Random Access Memory) and a hard disk, for example.
  • the recording medium 1005 is, for example, a storage device such as a RAM or a hard disk, a ROM (Read Only Memory), or a portable recording medium.
  • the storage device 1003 may be the recording medium 1005.
  • the processor 1001 can read and write data and programs from and to the memory 1002 and the storage device 1003.
  • the processor 1001 can access, for example, other devices via the I / O interface 1004.
  • the processor 1001 can access the recording medium 1005.
  • the recording medium 1005 stores a program that causes the computer 1000 to operate as one of the communication apparatuses according to the embodiment of the present invention.
  • the processor 1001 loads a program stored in the recording medium 1005 to cause the computer 1000 to operate as one of the communication apparatuses according to the embodiment of the present invention. Then, when the processor 1001 executes the program loaded in the memory 1002, the computer 1000 operates as one of the communication apparatuses according to the embodiment of the present invention.
  • the units included in the following first group include, for example, a dedicated program that can be read from a recording medium 1005 that stores the program into the memory 1002 and that can realize the function of each unit, and a processor 1001 that executes the program. Can be realized.
  • the units included in the following second group include, for example, a dedicated program that can be read from a recording medium 1005 that stores the program into the memory 1002 and that can realize the function of each unit, and a processor 1001 that executes the program. Can be realized.
  • the first group includes a data transmission unit 101, a management unit 102, a change unit 103, a notification reception unit 104, a switching detection unit 105, a delivery confirmation reception unit 106, a determination unit 107, a switching reception unit 108, and a switching transmission unit 109. It is.
  • the second group includes a data reception unit 201, a determination unit 202, a notification transmission unit 203, a delivery confirmation transmission unit 204, a switching detection unit 205, a switching transmission unit 206, a switching reception unit 207, and a change instruction unit 208.
  • a part or all of the parts included in the first group and the part included in the second group can be realized by a dedicated circuit that realizes the function of each part.
  • (Appendix 1) Management means for maintaining a plurality of connections to the destination device; A temporary disconnection is detected in response to detecting a temporary disconnection in a state where communication with the transmission destination device performed by the data transmission unit via the selected connection selected from the plurality of connections is interrupted. In addition to receiving the temporary suspension notification from the determination means for transmitting Within a predetermined period based on the temporary disconnection notification from the switching detection unit that detects switching of the communication path between the data transmission unit and the transmission destination device and transmits a switching notification when the completion of the switching is detected. If the switch notification is received on Changing means for selecting a new selected connection from the plurality of connections other than the selected connection, and transmitting an identifier of the selected selected connection to the data transmitting means;
  • a communication control device comprising:
  • the data transmission means transmits the data in association with a transmission time of the data
  • the determination means transmits the transmission time associated with the data transmitted last before the occurrence of the temporary disconnection in association with the temporary disconnection notification
  • the communication control device according to claim 1, wherein the changing unit sets a transmission time associated with the temporary disconnection notification to a start time of the predetermined period.
  • the data transmission means transmits the data at a predetermined interval, The communication control apparatus according to any one of appendices 1 to 3, wherein the determination unit determines the occurrence of the temporary disconnection when a magnitude of a deviation of the interval for receiving the data from the predetermined interval exceeds a predetermined threshold.
  • the start time of the predetermined period is a time that is a first predetermined time before a fixed time that is a time based on the temporary disconnection notification, or a last transmission time of the data before the occurrence of the temporary disconnection,
  • the communication control according to any one of appendices 1 to 4, wherein an end time of the predetermined period is a time after a second predetermined time from a fixed time that is a time based on the temporary suspension notification, or a reception time of the switching notification. apparatus.
  • a transmission device including the data transmission means;
  • the destination device including data receiving means for notifying the determination means of reception of the data in response to receiving the data;
  • the communication control device according to any one of appendices 1 to 5,
  • a communication system including:
  • the transmission device further includes the switching detection means and the communication control device,
  • the transmission destination device further includes the determination unit.
  • the communication system according to attachment 6.
  • the transmission destination device further includes a confirmation transmission unit that transmits a delivery confirmation indicating that the data reception unit has received the data, and the switching detection unit,
  • the transmission device further includes a confirmation reception unit that notifies the determination unit of the reception time of the delivery confirmation as the reception time of the data in response to receiving the delivery confirmation, and the determination unit.
  • Appendix 11 The communication control method according to appendix 9 or 10, wherein the temporary disconnection is detected based on a time elapsed since the transmission destination device last received data from the data transmission unit.
  • the start time of the predetermined period is a time that is a first predetermined time before a fixed time that is a time based on the temporary disconnection notification, or a last transmission time of the data before the occurrence of the temporary disconnection,
  • the communication control according to any one of appendices 9 to 12, wherein the end time of the predetermined period is a time that is a second predetermined time after a fixed time that is a time based on the temporary suspension notification, or a reception time of the switching notification.
  • (Appendix 14) Computer Management means for maintaining a plurality of connections to the destination device; A temporary disconnection is detected in response to detecting a temporary disconnection in a state where communication with the transmission destination device performed by the data transmission unit via the selected connection selected from the plurality of connections is interrupted.
  • a temporary suspension notification from the determination means for transmitting Within a predetermined period based on the temporary disconnection notification from the switching detection unit that detects switching of the communication path between the data transmission unit and the transmission destination device and transmits a switching notification when the completion of the switching is detected. If the switch notification is received on Changing means for selecting a new selected connection from the plurality of connections other than the selected connection, and transmitting an identifier of the selected selected connection to the data transmitting means; Communication control program to be operated.
  • (Appendix 15) Computer
  • the data transmission means for transmitting the data in association with the transmission time of the data;
  • the determination means for transmitting the transmission time associated with the data transmitted last before the occurrence of the suspension in association with the suspension notification;
  • the changing means for setting a transmission time associated with the suspension notice to a start time of the predetermined period;
  • Appendix 16 Computer The determination means for detecting the temporary disconnection based on a time elapsed since the transmission destination device last received data from the data transmission means; The communication control program according to appendix 14 or 15, which is operated as described above.
  • (Appendix 17) Computer The data transmission means for transmitting the data at a predetermined interval; The determination means for determining the occurrence of the temporary disconnection when the magnitude of deviation of the interval for receiving the data from the predetermined interval exceeds a predetermined threshold; The communication control program according to any one of appendices 14 to 16, which is operated as described above.
  • the start time of the predetermined period is a time that is a first predetermined time before a fixed time that is a time based on the temporary disconnection notification, or a last transmission time of the data before the occurrence of the temporary disconnection,
  • the communication control according to any one of appendices 14 to 17, wherein the end time of the predetermined period is a time after a second predetermined time from a fixed time that is a time based on the temporary suspension notification, or a reception time of the switching notification. program.
  • the present invention can be applied to systems that are severe in communication delay, such as voice and interactive services.

Abstract

La présente invention concerne un appareil de commande de communication qui peut raccourcir des retards même si tous les éléments de données transmis vers des chemins de communication sont soumis à une perte pendant un intervalle de temps suffisamment plus long qu'un intervalle entre transmissions des données qui sont transmises par intermittence. L'appareil de commande de communication comprend : un moyen de gestion qui maintient plusieurs connexions avec un appareil destinataire de transmission ; et un moyen de modification. Un moyen de détermination détecte une déconnexion temporaire, qui est un état dans lequel a été interrompue une communication effectuée par un moyen de transmission de données par le biais d'une connexion sélectionnée qui est sélectionnée parmi la pluralité de connexions, et transmet une notification de déconnexion temporaire lors de la détection de la déconnexion temporaire. Le moyen de modification reçoit, du moyen de détermination, la notification de déconnexion temporaire. Un moyen de détection de commutation détecte une commutation de chemin de communication exécutée entre le moyen de transmission de données et l'appareil destinataire de transmission, et transmet une notification de commutation lors de la détection d'une fin de la commutation. Après avoir reçu, du moyen de détection de commutation, la notification de commutation sur une période de temps prédéfinie basée sur la notification de déconnexion temporaire, le moyen de changement sélectionne une nouvelle connexion sélectionnée parmi la pluralité de connexions à l'exception de la connexion sélectionnée susmentionnée, et transmet l'identificateur de la nouvelle connexion sélectionnée au moyen de transmission de données.
PCT/JP2015/002018 2014-04-10 2015-04-10 Appareil et procédé de commande de communication ainsi que support d'enregistrement sur lequel a été mémorisé un programme de commande de communication WO2015155996A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005012711A (ja) * 2003-06-20 2005-01-13 Sony Corp リアルタイムデータ通信システム、リアルタイムデータ通信装置およびリアルタイムデータ通信方法
JP2013121028A (ja) * 2011-12-07 2013-06-17 Nippon Telegr & Teleph Corp <Ntt> データパケット伝送方法及びシステム

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005012711A (ja) * 2003-06-20 2005-01-13 Sony Corp リアルタイムデータ通信システム、リアルタイムデータ通信装置およびリアルタイムデータ通信方法
JP2013121028A (ja) * 2011-12-07 2013-06-17 Nippon Telegr & Teleph Corp <Ntt> データパケット伝送方法及びシステム

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