Abstract: When a radio terminal unit 30 undergoes a handover between base stations 34, 36, a previous edge router 40 having been connected to the radio terminal unit 30, out of edge routers 40, 42 provided in respective base stations 34, 36, provides an instruction to instruct a relay router 48, under which the edge router 40 and every edge router 42 in the base station 36 as a candidate for a destination of the movement are connected, to buffer data from a correspondent node, and instructs the relay router to forward the data buffered in the relay router 48 according to the instruction, to the radio terminal unit 30 after the movement, after completion of the handover, whereby the buffered data is forwarded to the radio terminal unit 30. This implements forwarding packet data through the optimal path to the radio terminal unit after the movement in the handover control and achieves effective utilization of network resources and reduction of handover transactions.

Abstract: Determining a cross over router on the occasion of a migration of a mobile terminal connected to a network during communication in the network. A path control device receives path control information from each router in the network and stores the information as a path control table. Then, a pre-migration path between the mobile terminal and the correspondent terminal is recognized and, on the occasion of a migration of a mobile terminal, the path control device predicts a post-migration path between the mobile terminal and the correspondent terminal. The path control device then compares the pre-migration path and the post-migration path to derive as a common part, and a router closest to the mobile terminal in the common part is determined as a cross over router.

Abstract: A mobile communication system 100 according to the present invention comprises handover control apparatus 1 and radio terminal unit 10. The handover control apparatus 1 controls handover of a radio terminal unit 10 between access routers 31-34 provided in respective base stations 21-24 for radio communication with the radio terminal unit 10. The handover control apparatus 1 counts the number of relay routers for every candidate access router 32-34 for a destination of the radio terminal unit 10, from a gateway device 52 and determines a COR on the basis of the number of relay routers for every access router 32, 33, 34 thus counted.

Abstract: A mobile communication system 100 according to the present invention comprises handover control apparatus 1 and radio terminal unit 10. The handover control apparatus 1 controls handover of a radio terminal unit 10 between access routers 31-34 provided in respective base stations 21-24 for radio communication with the radio terminal unit 10. The handover control apparatus 1 counts the number of relay routers for every candidate access router 32-34 for a destination of the radio terminal unit 10, from a gateway device 52 and determines a COR on the basis of the number of relay routers for every access router 32, 33, 34 thus counted.

Abstract: A mobile communications system is disclosed that includes a first local routing manager (LRM) providing a first network in which a mobile terminal is currently located, a second local routing manager (LRM) providing a second network in which a counterpart terminal communicating with the mobile terminal is currently located, and a home routing manager (HRM) managing correspondence between the unique home address of the counterpart terminal and the second network. The first LRM has a controller that acquires address information of the counterpart terminal from the second LRM, via the HRM, when the first LRM does not have the address information, and communication means that transmits the address information of the counterpart terminal to a router of a new cell in the first network when the mobile terminal moves into the new cell.

Abstract: A mobile communications system is disclosed that includes a first local routing manager (LRM) providing a first network in which a mobile terminal is currently located, a second local routing manager (LRM) providing a second network in which a counterpart terminal communicating with the mobile terminal is currently located, and a home routing manager (HRM) managing correspondence between the unique home address of the counterpart terminal and the second network. The first LRM has a controller that acquires address information of the counterpart terminal from the second LRM, via the HRM, when the first LRM does not have the address information, and communication means that transmits the address information of the counterpart terminal to a router of a new cell in the first network when the mobile terminal moves into the new cell.

Abstract: A battery forklift truck using a permanent magnet type synchronous motor, wherein the permanent magnet type synchronous motor for load handling is installed separately from a traveling motor driving wheels. The maximum rotational speed of the motor for load handling is set lower than that of the traveling motor to eliminate the need of field weakening control in a high rotational speed range so that the efficiency of the motor in load handling can be increased.

Abstract: When a radio terminal unit 30 undergoes a handover between base stations 34, 36, a previous edge router 40 having been connected to the radio terminal unit 30, out of edge routers 40, 42 provided in respective base stations 34, 36, provides an instruction to instruct a relay router 48, under which the edge router 40 and every edge router 42 in the base station 36 as a candidate for a destination of the movement are connected, to buffer data from a correspondent node, and instructs the relay router to forward the data buffered in the relay router 48 according to the instruction, to the radio terminal unit 30 after the movement, after completion of the handover, whereby the buffered data is forwarded to the radio terminal unit 30. This implements forwarding packet data through the optimal path to the radio terminal unit after the movement in the handover control and achieves effective utilization of network resources and reduction of handover transactions.

Abstract: A server device used in a mobile communication system which transfers a multicast packet sent from a sending terminal to a receiving terminal through a packet transfer network, includes: a multicast tree determination unit configured to determine a multicast tree showing a transfer route of the multicast packet; and an instruction unit configured to instruct a multicast-corresponding router within the packet transfer network to prepare a multicast transfer table used for transferring the multicast packet, in accordance with a determined multicast tree.

Abstract: A mobile communication system comprises an access router configured to assign a routing address to a transient address when receiving a user data packet including the transient address is set to a source address from a mobile terminal connecting to the access router and store a correspondence between the transient address and the routing address, and a management device configured to judge whether or not a handover is carried out by judging whether or not an existing routing address assigned to the mobile terminal by other access router than the access router to which the mobile terminal connects exists, based on a unique identifier of the mobile terminal.

Abstract: A mobile communications system is disclosed that includes a first local routing manager (LRM) providing a first network in which a mobile terminal is currently located, a second local routing manager (LRM) providing a second network in which a counterpart terminal communicating with the mobile terminal is currently located, and a home routing manager (HRM) managing correspondence between the unique home address of the counterpart terminal and the second network. The first LRM has a controller that acquires address information of the counterpart terminal from the second LRM, via the HRM, when the first LRM does not have the address information, and communication means that transmits the address information of the counterpart terminal to a router of a new cell in the first network when the mobile terminal moves into the new cell.

Abstract: The invention is aimed at determining a cross over router on the occasion of a migration of a mobile terminal connected to a network during communication in the network in which the transfer part and the control part are separated from each other. The path control device receives path control information from each router and stores the information as a path control table, thereby shares the path control information with the transfer part (S1). Thereupon a pre-migration path between the mobile terminal and the correspondent terminal is recognized (S2).

Abstract: In a configuration provided with routers 118-126and gateway device 130 connected above edge routers 102-116 provided in respective base stations in a hierarchical structure and configured to perform relaying of data to the base stations, a router 126 is specified as a relay router, which is a COR closer to a radio terminal unit out of CORs where all paths from an edge router 104 before movement of the radio terminal unit 100 and from each of all edge routers 102, 106 as destination candidates to CN 132 of a communication correspondent intersect. This makes it feasible to readily decrease the handover transaction time.

Abstract: When a radio terminal unit 30 undergoes a handover between base stations 34, 36, a previous edge router 40 having been connected to the radio terminal unit 30, out of edge routers 40, 42 provided in respective base stations 34, 36, provides an instruction to instruct a relay router 48, under which the edge router 40 and every edge router 42 in the base station 36 as a candidate for a destination of the movement are connected, to buffer data from a correspondent node, and instructs the relay router to forward the data buffered in the relay router 48 according to the instruction, to the radio terminal unit 30 after the movement, after completion of the handover, whereby the buffered data is forwarded to the radio terminal unit 30. This implements forwarding packet data through the optimal path to the radio terminal unit after the movement in the handover control and achieves effective utilization of network resources and reduction of handover transactions.

Abstract: A mobile communication system 100 according to the present invention comprises handover control apparatus 1 and radio terminal unit 10. The handover control apparatus 1 controls handover of a radio terminal unit 10 between access routers 31-34 provided in respective base stations 21-24 for radio communication with the radio terminal unit 10. The handover control apparatus 1 counts the number of relay routers for every candidate access router 32-34 for a destination of the radio terminal unit 10, from a gateway device 52 and determines a COR on the basis of the number of relay routers for every access router 32, 33, 34 thus counted.

Abstract: An apparatus for displaying a ladder diagram in a numerical control system having a programmable sequence control function in which sequence processing is executed based on a sequence program to deliver commands from a numerical control device to a machine and signals from the machine to the numerical control device. A display unit displays the sequence program in the form of a ladder diagram made up of relays. The pictures of ladder diagrams in the sequence program which are displayed on a screen are generated by pattern and character information stored in a character generator. The identification of a relay of interest or the memory address storing the state of the relay is entered, an item of sequence data indicating the conditions which turn the relay on are selected, and a ladder diagram segments indicative of the conditions are displayed on the basis of the sequence data.

Abstract: A machine position detecting apparatus according to the invention detects the absolute position of a machine by a pulse coder or the like attached to a movable element. Whenever the movable element of the machine is stopped, a check is performed to determine whether the detected position of the movable element is accurate. This is accomplished by a counter for counting the amount of shift of an absolute position detector circuit in one revolution based on a rotational position signal, and a collator for collating contents of the counting means with contents of position memory means and checking the stored contents of the position memory means when the movable element is stopped.

Abstract: A rotating head mechanism of a rotary type AC magnetic flux leakage flaw detector comprises a rotating disc which has an opening for passing a test piece for flaw detection, mounting frames which are disposed in the rotating disc so as to oppose to each other with the opening located therebetween, shafts which are rotatably disposed across the mounting frames and each of which has external threads of senses opposite to each other at a position on one side of the opening and a position on the other side thereof, a first nut which engages the external thread of one sense in the external threads of each shaft, a second nut which engages the external thread of the other sense in the external threads of each shaft, a first cradle which is coupled to the first nuts, a second cradle which is coupled to the second nuts, a first exciting magnetic poles/detecting probes-assembly which is mounted on the first cradle, a second exciting magnetic poles/detecting probes-assembly which is mounted on the second cradle, and ro

Abstract: An apparatus for displaying a ladder diagram in a numerical control system having a programmable sequence controller function in which sequence processing is executed based on a sequence program to deliver commands from a numerical control device to a machine and signals from the machine to the numerical control device. A display unit displays the sequence program in the form of a ladder diagram made up of at least relays. The identification of a relay or the memory address storing the state of the relay is entered by means of an input device, and an item of sequence data employing the relay is selected based on the relay identification or on the memory address. All ladder diagram segments that include the specified relay are then displayed on the display unit. The displayed segments include those in which the specified relay is as an input or output relay.

Abstract: A system for processing an MST function command in a numerical control system including a computerized numerical control apparatus (CNC, 10) and a PMC (programmable machine controller). A strobe signal MF, SF, TF is issued from the computerized numerical control apparatus (10) in an opposite logic state to that of a finish signal MFIN, SFIN, TFIN. The PMC (20) determines that there is a command when the strobe signal is of the opposite logic state to that of the finish signal being issued. When the execution of an MST function is finished, the finish signal is converted to a logic state opposite to that of the strobe signal MF, SF, TF. The computerized numerical control apparatus (10) determines that the processing of the MST function is finished when the logic state of the finish signal becomes identical to that of the strobe signal. When the finish signal and the strobe signal become different from each other as to their logic states, therefore, it can be determined that there is a command.