Abstract: In a case where another user's communication terminal (nTE113) departs from a group, user's communication terminal (TEb14) updates encryption information, using the terminal individual information of only the communication terminals (nTE213 and nTE313) which remain in the group (PNy). User's communication terminal (TEb14) encrypts the PN-shared key (KPNy), using the updated encryption information. User's communication terminal (TEb14) transmits the encrypted shared key information obtained from this encryption to a management device (PNSP11), and updates the encrypted shared key information stored in the management device (PNSP11).

Abstract: In a case where another user's communication terminal (nTE113) departs from a group, user's communication terminal (TEb14) updates encryption information, using the terminal individual information of only the communication terminals (nTE213 and nTE313) which remain in the group (PNy). User's communication terminal (TEb14) encrypts the PN-shared key (KPNy), using the updated encryption information. User's communication terminal (TEb14) transmits the encrypted shared key information obtained from this encryption to a management device (PNSP11), and updates the encrypted shared key information stored in the management device (PNSP11).

Abstract: The invention is directed to a traffic control system. The traffic control system comprises a communication device. The communication device includes a traffic type differentiation unit for differentiating a traffic type of an application that generates traffic to be processed on a communication network, a traffic control execution unit for controlling the traffic according to a traffic control condition corresponding to the traffic type, and a setting change reception unit for receiving setting change information on the traffic type or setting change information on the traffic control condition from the communication network. The traffic control system also comprises a setting change information transmission device provided on the communication network for transmitting setting change information.

Abstract: Traffic control for a communication network using a token bucket. Tokens stored in the token bucket and data throughput to/from a data buffer are monitored, and a new token rate is determined based on the data throughput during the period that at least one token is stored in the token buffer.

Abstract: The present invention provides a radio channel assignment method where each node in a network assigns radio channels to respective radio links in a decentralized manner without inconsistency. The radio channel assignment method includes a step of assigning one of a pair of nodes terminating each radio link and the other thereof to an upper side and a lower side (Step S1), and a step that each radio node located to the upper side from at least one of radio links terminating at an own node assigns a frequency slot different from that of an adjacent link to a radio link locating an own node to the upper side (Step S5).

Abstract: The present invention relate to traffic control for the communication network using a token bucket. According to the invention, tokens stored in the token bucket and data throughput to/from a data buffer are monitored, and new token rate is determined based on the data throughput during the period that at least one token is stored in the token buffer.

Abstract: The invention is directed to a traffic control system. The traffic control system comprises a communication device. The communication device includes a traffic type differentiation unit for differentiating a traffic type of an application that generates traffic to be processed on a communication network, a traffic control execution unit for controlling the traffic according to a traffic control condition corresponding to the traffic type, and a setting change reception unit for receiving setting change information on the traffic type or setting change information on the traffic control condition from the communication network. The traffic control system also comprises a setting change information transmission device provided on the communication network for transmitting setting change information.

Abstract: The present invention provides a radio channel assignment method where each node in a network assigns radio channels to respective radio links in a decentralized manner without inconsistency.

Abstract: There is provided a transmission line switch-over control system capable of significantly improving the nonoperational situation such as circuit disconnection during call or call quality deterioration without conducting unnecessary switch-over of a circuit or a transmission line.A line quality input data handler 5 acquires at least one transmission line quality data out of a received level, a received C/N, and a bit error rate of a normal transmission line 3 and sends it to a forecaster 6. The forecaster 6 produces estimated data of situation of transmission line based on the input quality data of the transmission line. A switch-over controller 7 presumes possibility that the line quality will deteriorate within a predetermined time such as, for example, the mean call holding time. If the presumed possibility of deterioration is larger than a predetermined decision threshold, the switch-over controller effects control so as to switch over the normal transmission line 3 to a back-up transmission line 4.