摘要:
A network resource reservation scheme capable of making a resource reservation at the IP level according to the resource reservation protocol at a time of data packet transfer at the IP level using ATM networks. A node device requests a change of a virtual connection for transferring data packets to a prescribed virtual connection for providing a service which is capable of changing an amount of resource without reestablishing connections, when a prescribed message of a resource reservation protocol for that virtual connection is received, and transmits the data packets to the prescribed virtual connection established in response to the request. A node device determines a necessary amount of resource according to a requested quality of service described in a received reservation message of a resource reservation protocol. A node device then requests a change of an amount of resource reserved in a virtual connection for transferring data packets in order to reserve the necessary amount of resource in that virtual connection, and transmits the data packets to that virtual connection in which the amount of resource reserved therein is changed in response to the request.
摘要:
A cell transmission rate control scheme in ATM network, capable of preventing incorrect updating of information in a resource management (RM) cell. The RM cell having an explicit cell rate field is transmitted and returned between the first and second end-nodes. A first cell transmission rate value written in the explicit cell rate field of the RM cell transmitted by the first end-node is stored at a control unit provided on the ATM network, and a second cell transmission rate value written in the explicit cell rate field of the RM cell returned by the second end-node is detected at the control unit. When the second cell transmission rate value is larger than the first cell transmission rate value, the second cell transmission rate value is rewritten into the first cell transmission rate value in the explicit cell rate field of the RM cell returned by the second end-node at the control unit.
摘要:
An example communication mediation apparatus mediates communication between networks and involves receiving a packet, from a first communication device belonging to a network under connection, addressed to a second communication device belonging to another network and calculating expected reception time of a packet transmitted next from the first communication device on the basis of reception history of packets from the first communication device and a traffic parameter that is information concerning a communication traffic determined with the first communication device.
摘要:
In a method for setting up a communication connection between radio communication devices which carry out data communications by using a frequency hopping scheme, the first radio communication device predicts a time at which a receiving processing of an identification packet containing an identifier for uniquely identifying the second radio communication device becomes possible at the second radio communication device, and transmits the identification packet to the second radio communication device, at the time at which the receiving processing of the identification packet becomes possible at the second radio communication device, in order to synchronize a frequency hopping pattern between the first radio communication device and the second radio communication device.
摘要:
In a radio communication system in which packet communications are carried out by setting up one or more connections between the radio base station and radio terminals, a radio base station or a radio terminal carries out the timeout control in which any packet that cannot be received completely through one connection within a timeout interval that is set in advance with respect to the one connection is regarded as lost, a change in a number of active connections that are currently carrying out communications with the radio base station is detected, and a new timeout interval is calculated and set with respect to each connection when the change in the number of active connections is detected.
摘要:
A scheme for controlling a congestion in the communication network, capable of realizing a recovery from the congestion state by the operation at the lower layer level for the communication data transfer alone, without relying on the upper layer protocol to be defined at the terminals. In a communication network including first and second node systems, a flow of communication data transmitted from the first node system to the second node system is monitored and regulated by using a monitoring parameter. On the other hand, an occurrence of congestion in the second node system is detected according to communication data transmitted from the second node system, and the monitoring parameter used in monitoring and regulating the flow of communication data is changed according to a detection of the occurrence of congestion in the second node system.
摘要:
The router, which serves as an egress of a first network, forms a frame out of a control frame, which is received through a virtual connection in the first network and is to be terminated at the router, and transmits the frame to a second network, i.e., to external of the first network. The router also forms a frame out of a data frame, which is received through the same virtual connection and is to be transferred through the router, and transfers the frame to the second network. The router, which serves as an ingress of a third network, receives the frame including the control frame, is able to change the information contained in another control frame to be transferred within the third network, based on the control information generated in the first network and contained in the received frame. Thus, each node in the networks can perform packet transfer control based not only on control/congestion information of its own network but also on control/congestion information of other networks.
摘要:
In a radio communication system formed by a plurality of radio base stations having respective service areas and a mobile radio terminal configured to transmit a data transmission request through one radio base station and receive requested data through at least one radio base stations, a radio control station is provided to predict a moving route of the mobile radio terminal according to a terminal location information obtained from the mobile radio terminal upon receiving the data transmission request from the mobile radio terminal through the one radio base station, select those radio base stations which have service areas containing at least a part of the predicted moving route, and deliver requested data to the selected radio base stations.
摘要:
A method of setting a wireless link is provided between a first wireless device and a second wireless device in a wireless system. The first wireless device includes an extremely low-power receiver. When the extremely low-power receiver receives a predetermined wireless signal, the receiver turns on the first wireless device, and continues broadcast transmission of a packet periodically without a transmission pause until receiving a response packet from the second wireless device.
摘要:
In a radio communication system formed by a plurality of radio base stations having respective service areas and a mobile radio terminal configured to transmit a data transmission request through one radio base station and receive requested data through at least one radio base stations, a radio control station is provided to predict a moving route of the mobile radio terminal according to a terminal location information obtained from the mobile radio terminal upon receiving the data transmission request from the mobile radio terminal through the one radio base station, select those radio base stations which have service areas containing at least a part of the predicted moving route, and deliver requested data to the selected radio base stations.