Abstract: A time synchronization device (10) according to the present disclosure includes: a selection unit (16) that selects one master device (1) that performs time synchronization from among a plurality of master devices (1); a correction value calculation unit (17) that calculates a time correction value for correcting an internal time such that the one master device (1) and the time synchronization device synchronize with each other; a correction value storage unit (18) that stores a previous time correction value used for correcting the internal time; and a correction value adjustment unit (19) that, in a case where the one master device (1) is switched, adjusts a time correction value calculated for a switching destination master device (1) on the basis of the stored time correction value and corrects the internal time on the basis of the adjusted time correction value.

Abstract: An information processing device in a communication apparatus performs a management process of traffic flow management information for transfer of data including a plurality of frames from a transmission source terminal to a transmission destination terminal. Where new traffic flow management information of a traffic flow associated with a data frame identified by an identification unit on the basis of identification information included in the received data frame is recorded in the communication apparatus, a recording unit determines whether the number of pieces of traffic flow management information already recorded is equal to or more than a threshold value, and calculates and records a scheduled release time of the traffic flow management information according to a determination result.

Abstract: A boundary clock (100) as a time synchronization device according to the present disclosure includes: an offset calculation unit (102) that calculates an offset that is a difference between device internal time of a higher-level device and device internal time of an own device; a transmission delay time calculation unit (103) that calculates a transmission delay time of a packet transmitted and received between the higher-level device and the own device; and a determination unit (111) that determines an occurrence location of a failure in time synchronization with the higher-level device on the basis of the offset and the transmission delay time, and stops synchronization of device internal time of a lower-level device with the device internal time of the own device in a case where it is determined that the occurrence location of the failure is the higher-level device.

Abstract: An information processing device according to an embodiment is a communication apparatus that is connected to a user apparatus via an access port and transmits user data from the user apparatus to another user apparatus connected to another communication apparatus via a network, and includes an acquisition function unit and an advertisement function unit. The acquisition function unit acquires a MAC address of a newly connected user apparatus in response to reception of a request for acquiring the MAC address of the user apparatus newly connected to the access port. The advertisement function unit advertises the MAC address acquired by the acquisition function unit to the other communication apparatus.

Abstract: A measurement instrument (30) according to the present disclosure includes: a UTC acquisition unit (31) configured to acquire a reference time from a satellite signal; a BC time acquisition unit (32) configured to acquire time information regarding an in-device time of a first device (3); a UTC-BC offset calculation processing unit (33) configured to calculate a first offset that is a difference between the reference time and the in-device time of the first device (3) based on the reference time and the time information; a BC-client offset calculation processing unit (34) configured to acquire a copy of the packet and calculate a second offset that is a difference between the in-device time of the first device (3) and the in-device time of the second device (4) based on the acquired packet and a transmission delay between the first device (3) and the second device (4); and a time accuracy calculation processing unit (35) configured to measure accuracy of an in-device time of the second device (4) with respect

Abstract: An information processing device in a communication apparatus performs a management process of traffic flow management information for transfer of data including a plurality of frames from a transmission source terminal to a transmission destination terminal. Where new traffic flow management information of a traffic flow associated with a data frame identified by an identification unit on the basis of identification information included in the received data frame is recorded in the communication apparatus, a recording unit determines whether the number of pieces of traffic flow management information already recorded is equal to or more than a threshold value, and calculates and records a scheduled release time of the traffic flow management information according to a determination result.

Abstract: An information communication device arranged between a transmission-side device and a reception-side device according to one embodiment includes a reception unit that receives transmission data to be transmitted from the transmission-side device to the reception-side device, a control unit that receives a notification indicating deterioration in quality the transmission data, determines conversion object data for converting a data type of the transmission data or reducing an information amount of the transmission data and non-conversion object data for not converting a data type based on the notification, and generates post-conversion object data by converting a type of the conversion object data based on the notification, a transmission queue that synthesizes the non-conversion object data and the post-conversion object data and generates converted transmission data, and a transmission unit that transmits the converted transmission data to the reception-side device.

Abstract: A measurement device according to an aspect of the present invention includes: a generation unit that generates first and second optical pulse trains in which a time interval between optical pulses is constant; a transmission unit that transmits the first optical pulse train to a device to be measured; a reception unit that receives the first optical pulse train returning from the device to be measured; a measurement unit that measures the number of optical pulses transmitted by the transmission unit from when the transmission unit transmits an optical pulse included in the first optical pulse train to when the reception unit receives the optical pulse; an identification unit that identifies a phase amount corresponding to a phase difference between the received first optical pulse train and the second optical pulse train; and a calculation unit that calculates a propagation delay amount between the measurement device and the device to be measured on the basis of the measured number of optical pulses and the

Abstract: A relay device includes a device internal clock to indicate time; a memory to store information; a communication unit to transmit and receive a signal including a synchronization signal and a normal signal to and from a master and a slave. Further, there is a retention time processing unit to store synchronization signal information indicating the synchronization signal received by the communication unit in the memory and extract the synchronization signal information from the memory when a retention setting time longer than a first predetermined time elapses from the reception of the synchronization signal by using the time indicated by the device internal clock; and a transmission signal control unit to control the communication unit to stop transmitting the normal signal when the first predetermined time elapses from the reception of the synchronization signal and transmit the synchronization signal indicating the synchronization signal information.

Abstract: According to an embodiment, a transmission apparatus includes: a synchronization frame generation unit configured to generate a synchronization frame to be associated with a user frame; a synchronization frame identifier application unit configured to apply a synchronization frame identifier that enables recognition of a transmission order property of the synchronization frame to each synchronization frame generated by the synchronization frame generation unit and embed the synchronization frame identifier in the synchronization frame; a synchronization frame insertion unit configured to insert the synchronization frame with the synchronization frame identifier embedded therein by the synchronization frame identifier application unit into a point immediately after another user frame associated with another synchronization frame one before the user frame associated with the synchronization frame and immediately before the user frame associated with the synchronization frame; and a frame copying unit configured

Abstract: According to one embodiment, there is provided a communications system that conducts multiplex communications of main signals and at least one sub-signal via redundant routes between a transmission apparatus and a reception apparatus. The transmission apparatus includes a main signal duplication unit configured to duplicate each of the main signals to be communicated via a main signal channel, according to the number of the redundant routes, and a delay unit configured to adjust sending timings of copies of the main signal on the respective redundant routes based on the at least one sub-signal to be communicated via a sub-signal channel and transmit the copies of the main signal to the respective redundant routes.

Abstract: According to one aspect of the disclosure, in a communication apparatus at a transmission end, a packet train that is input is grouped to generate a duplicate packet for each packet group. For each packet group, encoded packets are generated using some packets in a group of duplication source packets and other packets in a group of duplicate packets that do not correspond to the some packets in the group of duplication source packets, and above-described other packets in the duplication source, some packets in the group of duplicate packets that are not used to generate the encoded packets, and the above-described encoded packets are transmitted.

Abstract: SeNBs generate first identification information for specifying wireless access networks on the basis of system information provided in a notification from a relay communication device, wirelessly transmit the first identification information to UE, and notifiy an MeNB of second identification information for specifying wireless resources, utilization of which is permitted, via the relay communication device. The MeNB sets, in a signal directed to an SeNB selected from the SeNBs in the first identification information received from the UE, the first identification information of the SeNB, sets the second identification information of the selected SeNB in the signal directed to the UE, and transmits the signal to the relay communication device. The relay communication device transfers the signal received from the master base station to the SeNB in accordance with the first identification or the second identification information set in the signal.

Abstract: Provided are a control apparatus, a control method, and a program capable of designing efficient end-to-end monitoring in a VPN infrastructure. The control apparatus according to the present invention controls end-to-end monitoring in a VPN infrastructure in which communications of a plurality of users are superimposed. The control apparatus includes a user end database 11 that stores information about customer edge apparatuses (CEs) for each of the users, each of the CEs serving as a monitoring end of end-to-end monitoring, an end-to-end path database 12 that stores information about all links included in a path between the CEs, and an end-to-end monitoring management unit 13 that sets a monitoring path for end-to-end monitoring to between the CEs so that combinations of the monitoring path passing through each of the links are coprime.

Abstract: An object is to provide a communication device, a communication method, and a program that make it possible to suppress an increase in the communication band due to communication via a GWR when Dual Connectivity is implemented, without making an additional setting on base stations. A communication device according to the present invention enables a communication packet to be transferred through a path that is shorter than conventional paths, and can therefore suppress an increase in the communication band. Also, this short cut of the communication path need only be set on the communication device, and need not be additionally set on the base stations.

Abstract: SeNBs generate first identification information for specifying wireless access networks on the basis of system information provided in a notification from a relay communication device, wirelessly transmit the first identification information to UE, and notifiy an MeNB of second identification information for specifying wireless resources, utilization of which is permitted, via the relay communication device. The MeNB sets, in a signal directed to an SeNB selected from the SeNBs in the first identification information received from the UE, the first identification information of the SeNB, sets the second identification information of the selected SeNB in the signal directed to the UE, and transmits the signal to the relay communication device. The relay communication device transfers the signal received from the master base station to the SeNB in accordance with the first identification or the second identification information set in the signal.

Abstract: Provided are a control apparatus, a control method, and a program capable of designing efficient end-to-end monitoring in a VPN infrastructure. The control apparatus according to the present invention controls end-to-end monitoring in a VPN infrastructure in which communications of a plurality of users are superimposed. The control apparatus includes a user end database 11 that stores information about customer edge apparatuses (CEs) for each of the users, each of the CEs serving as a monitoring end of end-to-end monitoring, an end-to-end path database 12 that stores information about all links included in a path between the CEs, and an end-to-end monitoring management unit 13 that sets a monitoring path for end-to-end monitoring to between the CEs so that combinations of the monitoring path passing through each of the links are coprime.

Abstract: An object is to provide a communication device, a communication method, and a program that make it possible to suppress an increase in the communication band due to communication via a GWR when Dual Connectivity is implemented, without making an additional setting on base stations. A communication device according to the present invention enables a communication packet to be transferred through a path that is shorter than conventional paths, and can therefore suppress an increase in the communication band. Also, this short cut of the communication path need only be set on the communication device, and need not be additionally set on the base stations.