Abstract: A bisimide phenyl ester acid dianhydride represented by the following formula (2): where R3 and R4 each independently represents a hydrogen atom or an organic group having 1 to 10 carbon atoms; each m is independently an integer of 1 to 4; and each A independently represents an aromatic ring or an alicyclic ring.

Abstract: A data transmission apparatus including a receiving unit for receiving transmitted packets; a priority decision unit; a retransmission packet storage unit; a retransmission instruction receiving unit for receiving a retransmission request from a terminal at the receiving end; a retransmission decision unit; a transmission queue management unit; and a transmission unit.

Abstract: A data transmission apparatus including a receiving unit for receiving transmitted packets; a priority decision unit; a retransmission packet storage unit; a retransmission instruction receiving unit for receiving a retransmission request from a terminal at the receiving end; a retransmission decision unit; a transmission queue management unit; and a transmission unit.

Abstract: A data transmission apparatus including a receiving unit for receiving transmitted packets; a priority decision unit; a retransmission packet storage unit; a retransmission instruction receiving unit for receiving a retransmission request from a terminal at the receiving end; a retransmission decision unit; a transmission queue management unit; and a transmission unit.

Abstract: Disclosed is a migration communication control device constructed to control a continuous communication between a mobile node and a node unaffected the mobile node's migration. The migration communication control device comprises a first migration control unit, a second migration control unit on the mobile node, and a third migration control unit on the partner node. The first migration control unit comprises a packet transfer unit and an address post unit. The packet transfer unit receives a packet which was destined for an outdated address of the mobile node, generates a conversion packet which holds an updated address instead of the outdated address, and then transmits the conversion packet, while an address post unit transmits an address post message which indicates the updated address to the third migration control unit. The second migration control unit comprises a migration post unit and a packet resumption unit.

Abstract: Disclosed is a migration communication control device constructed to control a continuous communication between a mobile node and a node unaffected the mobile node's migration. The migration communication control device comprises a first migration control unit, a second migration control unit on the mobile node, and a third migration control unit on the partner node. The first migration control unit comprises a packet transfer unit and an address post unit. The packet transfer unit receives a packet which was destined for an outdated address of the mobile node, generates a conversion packet which holds an updated address instead of the outdated address, and then transmits the conversion packet, while an address post unit transmits an address post message which indicates the updated address to the third migration control unit. The second migration control unit comprises a migration post unit and a packet resumption unit.

Abstract: Disclosed is a migration communication control device constructed to control a continuous communication between a mobile node and a node unaffected the mobile node's migration. The migration communication control device comprises a first migration control unit, a second migration control unit on the mobile node, and a third migration control unit on the partner node. The first migration control unit comprises a packet transfer unit and an address post unit. The packet transfer unit receives a packet which was destined for an outdated address of the mobile node, generates a conversion packet which holds an updated address instead of the outdated address, and then transmits the conversion packet, while an address post unit transmits an address post message which indicates the updated address to the third migration control unit. The second migration control unit comprises a migration post unit and a packet resumption unit.

Abstract: Disclosed is a migration communication control device constructed to control a continuous communication between a mobile node and a node unaffected the mobile node's migration. The migration communication control device comprises a first migration control unit, a second migration control unit on the mobile node, and a third migration control unit on the partner node. The first migration control unit comprises a packet transfer unit and an address post unit. The packet transfer unit receives a packet which was destined for an outdated address of the mobile node, generates a conversion packet which holds an updated address instead of the outdated address, and then transmits the conversion packet, while an address post unit transmits an address post message which indicates the updated address to the third migration control unit. The second migration control unit comprises a migration post unit and a packet resumption unit.

Abstract: A data transmission apparatus including a receiving unit for receiving transmitted packets; a priority decision unit; a retransmission packet storage unit; a retransmission instruction receiving unit for receiving a retransmission request from a terminal at the receiving end; a retransmission decision unit; a transmission queue management unit; and a transmission unit.

Abstract: A data transmission apparatus including a receiving unit for receiving transmitted packets; a priority decision unit; a retransmission packet storage unit; a retransmission instruction receiving unit for receiving a retransmission request from a terminal at the receiving end; a retransmission decision unit; a transmission queue management unit; and a transmission unit.

Abstract: A partner node and a method of communication control with a mobile node that is a communication partner with the partner mode is provided. The mobile node can provide a migration destination address, via a migration post massage transmitted from the mobile node, that can be acquired by an address acquiring unit at the partner node. A packet convert unit can, before the address acquire unit acquires a new migration destination address, generate a packet destined for a pre-migration address of the mobile node. After the address acquire unit acquires a migration destination address, the packet convert unit can generate a final packet configuration destined for the obtained migration destination address. Accordingly, a continuous communication between the corresponding partner node and the mobile node is maintained as the mobile node migrates across networks.

Abstract: A data transmission apparatus including a receiving unit for receiving transmitted packets; a priority decision unit; a retransmission packet storage unit; a retransmission instruction receiving unit for receiving a retransmission request from a terminal at the receiving end; a retransmission decision unit; a transmission queue management unit; and a transmission unit.

Abstract: Disclosed is a migration communication control device constructed to control a continuous communication between a mobile node and a node unaffected the mobile node's migration. The migration communication control device comprises a first migration control unit, a second migration control unit on the mobile node, and a third migration control unit on the partner node. The first migration control unit comprises a packet transfer unit and an address post unit. The packet transfer unit receives a packet which was destined for an outdated address of the mobile node, generates a conversion packet which holds an updated address instead of the outdated address, and then transmits the conversion packet, while an address post unit transmits an address post message which indicates the updated address to the third migration control unit. The second migration control unit comprises a migration post unit and a packet resumption unit.

Abstract: A partner node migration control unit that permits a communication control device, for example of the type carried by a user, to efficiently move across a network, whereby a mobile node can obtain an address assigned to each network and a partner node, which is a communication partner of the mobile node. The migration communication control device, including an address post message receiving unit receiving an address post message indicating the update address of the mobile node from a packet transfer migration control unit. In turn, the packet transfer migration control unit can transmit an updated address of the mobile node to the partner node. A packet conversion unit converts a destination address of the packet to be transmitted to the mobile node into an update address, indicated by the address post message.

Abstract: A mobile node is provided having an address-obtaining unit that can obtain a temporary address that is assigned to the mobile node for each network to which the mobile node migrates. The temporary address is held an address hold unit and corresponds with a home address that has been set in advance. Additionally, an address post processing unit can post an address post message including the temporary address to a home migration host position control unit that manages addresses of the mobile node.

Abstract: A data transmission apparatus for relaying data transmitted from the transmitting end in units of packets, each packet having additional information relating to its sequence number, priority and data reproduction time, comprises: a receiving unit for receiving packets transmitted from the transmitting end; a priority decision unit for deciding the priority of each of the received packets; a retransmission packet storage unit for storing packets the priorities of which are equal to or higher than a predetermined value, as retransmission packets, on the basis of the priority of each packet decided by the priority decision unit; a retransmission instruction receiving unit for receiving a retransmission request from a terminal at the receiving end; a retransmission decision unit for deciding whether retransmission of the packet for which the retransmission request has been made should be performed or not, on the basis of the retransmission request and the storage status of the retransmission packets in the retran

Abstract: Disclosed is a migration communication control device constructed to control a continuous communication between a mobile node and a node unaffected the mobile node's migration. The migration communication control device comprises a first migration control unit, a second migration control unit on the mobile node, and a third migration control unit on the partner node. The first migration control unit comprises a packet transfer unit and an address post unit. The packet transfer unit receives a packet which was destined for an outdated address of the mobile node, generates a conversion packet which holds an updated address instead of the outdated address, and then transmits the conversion packet, while an address post unit transmits an address post message which indicates the updated address to the third migration control unit. The second migration control unit comprises a migration post unit and a packet resumption unit.

Abstract: A home migration host position control device includes an address post processing unit that is capable of receiving an address post message from the mobile node when it migrates to a different network and is assigned a new temporary address. A home migration host list hold unit can store address information that correlates the temporary address with a home address that is contained in the address post message. A packet transfer unit that can, upon receiving a packet that is destined for the home address of the mobile node, transfer a capsulated packet that is generated by attaching to the received packet a header that indicates a destination address by a temporary address that is correlated with a home address according to address information that is stored in the home migration host list hold unit.

Abstract: A data transmission apparatus including a receiving unit for receiving transmitted packets; a priority decision unit; a retransmission packet storage unit; a retransmission instruction receiving unit for receiving a retransmission request from a terminal at the receiving end; a retransmission decision unit; a transmission queue management unit; and a transmission unit.

Abstract: In a data transmission method of the present invention, not only when relay of input packets is performed but also transmission of a retransmission packet or a correction packet is performed, changes in an output rate due to output rate control is suppressed, and data transmission is efficiently performed according to a capacity of an output channel. A data transmission device comprises a packet priority decision unit 15 for deciding priorities of input packets, a retransmission packet, and an FEC packet, an output delay calculation unit 17 for calculating a delay time until data of the respective packets is reproduced by a receiving terminal, and an FEC packet generation unit 19 for generating an FEC packet containing an error correcting code which corresponds to a packet designated on the basis of the priorities of the respective packets.