Ntt Docomo, Inc.

Yasuhisa Hayashi

Masami Yabusaki

Manhee Jo

Takeshi Ihara

Takatoshi Okagawa

Hiroshi Kawakami

Ken Igarashi

Wataru Takita

The packet switching system for transmitting and receiving a packet via a packet switching network, which comprises a plurality of routing tables (#. . . ), each of which has been generated by a unique routing policy, stored in the routing apparatuses deployed at the border, at the origin or at the end of the respective routing domains, an identifier (RTI) inserted in the packet to specify the routing tables, and an identifier changer to change a value of the identifier on the packet switching network. The routing apparatus selects one of the routing tables (#. . . ) according to the RTI in the received packet and transfers the packet to a destination that is specified by the selected routing table.

Packet switching system, packet switching method, routing apparatus, structure of packet, and packet generating method

A communications system which allows data transfer not using a terminal ID assigned by an access network but using routing information distinct from the terminal ID is provided. The communications system transmits data including, as a destination address, a second terminal ID, from a first terminal to the second terminal via a plurality of transfer devices. A first transfer device includes a first memory for storing the second terminal ID and routing information for routing the data to a second transfer device, associating them with one another, and a routing processor for adding to the data the routing information for routing the data to the second transfer device associated with the second terminal ID included in the data, and transferring the data to the second transfer device.

Communications system, communications method, network manager, and transfer device

HLR installed in an environment in which there are a plurality of mobile communication networks, is provided with a whole managed object manager for storing and managing subscriber number IDs and HLR information to manage the subscriber number IDs, in correspondence to each other; a subscriber data manager for storing and managing subscriber number IDs registered as managed objects of the host HLR and subscriber data of the subscriber numbers in correspondence to each other; and a determination controller for determining whether subscriber management information (subscriber number IDs and subscriber data) of managed objects in the host HLR is to be transferred to another HLR, based on criterion information such as current subscriber management information volume and accommodation capacity information, and for, when the transfer is necessary, determining a recipient HLR and subscriber management information of a transferred object, based on the criterion information in each HLR and a predetermined standard.

Location register and accommodation transfer control method

A router includes a clock configured to be synchronous to a transmission terminal that transmits a data packet; a comparator configured to compare a delay time of the data packet with an acceptable delay time of the data packet based on the time obtained from the clock; and a packet processing unit configured to either transfer or discard the data packet based on the comparison result of the comparator.

Router, terminal apparatus, communication system and routing method

A communication system is provided, in which the communication system includes: a part for receiving a call establishment request from a communication terminal, and sending, to the communication terminal, a call forwarding destination information including information on at least a call forwarding destination; and a part for receiving information on a call forwarding destination which is selected by a caller from the communication terminal, and allowing the communication terminal and the call forwarding destination to communicate with each other according to the information on the call forwarding destination.

Incoming call forwarding communication system and the method

The handover control method for use in a mobile communication system changes a handover method according to an overlapping zone residence time of a mobile station by ranking three handover methods for the mobile station including a gateway handover method, a base station controller path extension handover method, and a radio link path extension handover method in association with how long the overlapping zone residence time of the mobile station is, and by selecting one handover method that corresponds to the overlapping zone residence time of the mobile station. When either the gateway handover method or the base station controller path extension handover method is selected for use, the handover method selects a handover path of which load on the system is minimum among the handover paths that can be employed by the selected handover method.

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Yokohama, Japan

Yasuhisa Hayashi