Abstract: In order to provide a communication system and the like which are capable of updating a correction value of a time synchronization packet, and to which a traffic bonding scheme is applied, a set of primary devices of the communication system determines presence or absence of communication in a first transmission path, adds an actual measurement value of a first delay amount to an information value when a determination result according to the determination is that the communication is present, or adds, to the information value, a design value of a second delay amount being the delay amount inside the wireless transmission device and the wireless reception device when the determination result is that the communication is absent.

Abstract: A wireless communication system, in which a redundancy bit is transmitted from a first communication device to a second communication device when the second communication device fails to decode the encoded bits, includes a processor. The processor selects communication patterns that respectively satisfy a requested quality, calculates, for each of the selected communication patterns, a transmission data length that indicates a length of the redundancy bit, calculates, for each of the selected communication patterns, a transmission latency between the first communication device and the second communication device based on the calculated transmission data length, and generates a retransmission parameter corresponding to a communication pattern with lowest transmission latency among the selected communication patterns.

Abstract: A wireless communication apparatus (10) includes: a switching control unit (103) that determines an active mode wireless communication apparatus at an opposite side based on a failure occurrence status of an active mode wireless communication apparatus at the opposite side under a situation that the wireless communication apparatus (10) is in the active mode; a wireless transmitting unit (101) that transmits a switch instruction to the opposite side under the situation that the wireless communication apparatus (10) is in the active mode, the switch instruction instructing the active mode wireless communication apparatus at the opposite side that is determined; and a wireless receiving unit (102) that receives the switch instruction from the opposite side, wherein the switching control unit (103) switches the wireless communication apparatus (10) to one of the active mode and the standby mode based on the switch instruction received from the opposite side.

Abstract: A wireless communication system, in which a redundancy bit is transmitted from a first communication device to a second communication device when the second communication device fails to decode the encoded bits, includes a processor. The processor selects communication patterns that respectively satisfy a requested quality, calculates, for each of the selected communication patterns, a transmission data length that indicates a length of the redundancy bit, calculates, for each of the selected communication patterns, a transmission latency between the first communication device and the second communication device based on the calculated transmission data length, and generates a retransmission parameter corresponding to a communication pattern with lowest transmission latency among the selected communication patterns.

Abstract: A wireless communication apparatus (10) includes: a switching control unit (103) that determines an active mode wireless communication apparatus at an opposite side based on a failure occurrence status of an active mode wireless communication apparatus at the opposite side under a situation that the wireless communication apparatus (10) is in the active mode; a wireless transmitting unit (101) that transmits a switch instruction to the opposite side under the situation that the wireless communication apparatus (10) is in the active mode, the switch instruction instructing the active mode wireless communication apparatus at the opposite side that is determined; and a wireless receiving unit (102) that receives the switch instruction from the opposite side, wherein the switching control unit (103) switches the wireless communication apparatus (10) to one of the active mode and the standby mode based on the switch instruction received from the opposite side.

Abstract: In order to improve efficiency of data transmission in a wireless transmission band under a condition in which both adaptive modulation scheme and FDD scheme are employed, and fixed rate signals and a variable rate signal are multiplex-transmitted, one wireless transmission device (2_1) multiplexes a plurality of fixed rate signals (FS1_1 to n) and a variable rate signal (VS2) to generate a frame (FR1), and sends the frame (FR1) to another wireless transmission device (2_2) through a wireless transmission path (CH1). At this time, the device (2_1) includes, in the frame (FR1), information (MN) relating to a number of multiplexed fixed rate signals. The device (2_2) multiplexes a plurality of fixed rate signals (FS3_1 to n) and a variable rate signal (VS3) to generate a frame (FR2), and sends the frame (FR2) to the device (2_1) through a wireless transmission path (CH2) having a different frequency.

Abstract: A data transmission apparatus includes: a transmission data division unit which divides transmission data into blocks; a transmission unit which transmits the blocks divided by the transmission data division unit to the transmission destination apparatus; a calculation unit which calculates a size of residual data generated by dividing the transmission data into the blocks each having the predetermined data size; and a residual data judgment unit which judges whether the size of the residual data calculated by the calculation unit is smaller or not smaller than a minimum data size which the receiving apparatus can receive.

Abstract: In a storage system a first control device can restore in a restoration destination storage device a second set of data stored in a second storage device on the basis of a first set of data stored in a first storage device. A third storage device stores progress information indicative of the progress of restoration performed by a first control device. A second control device restores a portion of the second set of data which is not yet restored on the basis of the progress information stored in the third storage device at the time of detecting that the first control device has stopped.

Abstract: A data transmission apparatus (10) includes: a transmission data division unit (11) which divides transmission data into blocks; a transmission unit (12) which transmits the blocks divided by the transmission data division unit to the transmission destination apparatus (2); a calculation unit (13) which calculates a size of residual data generated by dividing the transmission data into the blocks each having the predetermined data size; and a residual data judgment unit (14) which judges whether the size of the residual data calculated by the calculation unit (13) is smaller or not smaller than a minimum data size which the receiving apparatus (2) can receive.

Abstract: [Problem] The problem is to carry out the QoS control which tracks a change in a state of an outward line. [Means for solving the problem] A network repeater according to the present invention includes: a flow control means to carry out flow control for restricting inflow of a data flow which is received through an inward line; a bandwidth control means to carry out bandwidth control of controlling a bandwidth of a data flow which is received through the inward line and is sent through an outward line; and an outward line monitoring means to monitor a change in a state of the outward line. In the case that the monitored state of the outward line satisfies a specified condition which is determined in advance, either the flow control or the bandwidth control is carried out on a condition corresponding to the specified condition.

Abstract: A wireless network relay apparatus includes a Layer 2 switch and a line control device as well as wireless/wired line terminating devices performing band limitation associated with an AMR function. It measures traffic passing through each line terminating device in inflow/outflow path directions. Upon detecting a modulation scheme changed due to an AMR function in a wireless area, it may specify a line terminating device so as to read a desired modulation scheme from a transmission source modulation scheme conversion table of the line control device based on traffic. It may change a local modulation scheme with a desired modulation scheme when a difference therebetween is above a predetermined number of stages. By tracking a modulation scheme changed for a transmission destination, it is possible to appropriately change a modulation scheme for a transmission source, thus suppressing traffic without discarding necessary data.

Abstract: In order to improve efficiency of data transmission in a wireless transmission band under a condition in which both adaptive modulation scheme and FDD scheme are employed, and fixed rate signals and a variable rate signal are multiplex-transmitted, one wireless transmission device (2—1) multiplexes a plurality of fixed rate signals (FS1—1 to n) and a variable rate signal (VS2) to generate a frame (FR1), and sends the frame (FR1) to another wireless transmission device (2—2) through a wireless transmission path (CH1). At this time, the device (2—1) includes, in the frame (FR1), information (MN) relating to a number of multiplexed fixed rate signals. The device (2—2) multiplexes a plurality of fixed rate signals (FS3—1 to n) and a variable rate signal (VS3) to generate a frame (FR2), and sends the frame (FR2) to the device (2—1) through a wireless transmission path (CH2) having a different frequency.

Abstract: In a storage system a first control device can restore in a restoration destination storage device a second set of data stored in a second storage device on the basis of a first set of data stored in a first storage device. A third storage device stores progress information indicative of the progress of restoration performed by a first control device. A second control device restores a portion of the second set of data which is not yet restored on the basis of the progress information stored in the third storage device at the time of detecting that the first control device has stopped.

Abstract: [Problem] The problem is to carry out the QoS control which tracks a change in a state of an outward line. [Means for solving the problem] A network repeater according to the present invention includes: a flow control means to carry out flow control for restricting inflow of a data flow which is received through an inward line; a bandwidth control means to carry out bandwidth control of controlling a bandwidth of a data flow which is received through the inward line and is sent through an outward line; and an outward line monitoring means to monitor a change in a state of the outward line. In the case that the monitored state of the outward line satisfies a specified condition which is determined in advance, either the flow control or the bandwidth control is carried out on a condition corresponding to the specified condition.

Abstract: In a wireless communication network, a data communication device (e.g. a Layer 2 switch) includes a wireless monitoring device, a path cost control device, and a communication path control device. Due to an increase of path costs in wireless areas, the path control device recalculates path costs over a network so as to carry out switching to an appropriate data communication path, e.g. a LAN with blocking a wireless line. When a wireless band is recovered due to an AMR function, the wireless monitoring device sends a path cost change request to the path cost control device, which in turn reduces a path cost at a wireless line port. Additionally, the communication path control device recalculates path costs over a network so as to switch over data communication paths. Thus, it is possible to select an optimum data communication path with a low cost.

Abstract: A wireless network relay apparatus includes a Layer 2 switch and a line control device as well as wireless/wired line terminating devices performing band limitation associated with an AMR function. It measures traffic passing through each line terminating device in inflow/outflow path directions. Upon detecting a modulation scheme changed due to an AMR function in a wireless area, it may specify a line terminating device so as to read a desired modulation scheme from a transmission source modulation scheme conversion table of the line control device based on traffic. It may change a local modulation scheme with a desired modulation scheme when a difference therebetween is above a predetermined number of stages. By tracking a modulation scheme changed for a transmission destination, it is possible to appropriately change a modulation scheme for a transmission source, thus suppressing traffic without discarding necessary data.

Abstract: A packet received by a first or second relay apparatus from a first switching device is distributed to the first relay apparatus and the second relay apparatus. The first relay apparatus transmits the distributed packet to a third relay apparatus. The second relay apparatus transmits the distributed packet to a fourth relay apparatus. Next, the third relay apparatus and the fourth relay apparatus transfer the packet received from the first or second relay apparatus to either the third or fourth relay apparatus, and the relay apparatus that receives the pertinent transferred packet transmits the transferred packet to a second switching device.

Abstract: A camera device capable of taking a commemorative image of an operator serving as a subject which includes a background image by a remote operation from an operation terminal held by the operator through a communication network, includes: a section that calculates a photographic target area based on position information of a camera section and state information of the camera section which includes at least one of a pan angle, a tilt angle, and a zoom magnification; a section that determines whether or not the operation terminal is located within the photographic target area based on terminal position information received from the operation terminal through the communication network and information indicating the calculated photographic target area; and a section that permits high-image quality photographing and enabling transmission of a video image subjected to high-image quality processing to the operation terminal through the communication network when it is determined that the operation terminal is locate

Abstract: Based on an input/output request from a server, a volume formed of a plurality of disk apparatuses having a RAID (Redundant Arrays of Inexpensive Disks) configuration is accessed. A performance measuring unit periodically measures the performance of the plurality of disk apparatuses during apparatus operation, and a performance-measurement-value storage unit stores a performance measurement value obtained through measurement. When the performance is determined from the performance measurement value as having been deteriorated, a performance improving unit adds a disk apparatus to increase the size of the volume. Also, the performance improving unit sets a performance threshold for each of performance measurement values of a plurality of types and, when at least any one of the performance measurement values falls below a corresponding performance threshold, adds a disk apparatus.

Abstract: A camera device capable of taking a commemorative image of an operator serving as a subject which includes a background image by a remote operation from an operation terminal held by the operator through a communication network, includes: a section that calculates a photographic target area based on position information of a camera section and state information of the camera section which includes at least one of a pan angle, a tilt angle, and a zoom magnification; a section that determines whether or not the operation terminal is located within the photographic target area based on terminal position information received from the operation terminal through the communication network and information indicating the calculated photographic target area; and a section that permits high-image quality photographing and enabling transmission of a video image subjected to high-image quality processing to the operation terminal through the communication network when it is determined that the operation terminal is locate