Abstract: Disclosed is a telemetering system that comprises a wireless base station and a number of wireless sensor nodes. Each wireless sensor node includes a solar cell, a sensor for producing observation data indicating a quantity being measured, a wireless interface for receiving the observation data from the sensor when the node is activated, and a time-schedule memory for storing time-schedule data. Control circuitry briefly activates its own node by supplying power from the solar cell to the wireless interface at periodic intervals according to the time-schedule data of the memory and briefly establishes a wireless link to the base station. During the time the wireless link is briefly established, the control circuitry of each node transmits the observation data to the base station and updates its time-schedule memory if it receives time-schedule data from the base station.

Abstract: A unicast/multicast system has an internal cell generating section that generates an internal cell to include its output index information based on user data, and an output port conversion table that stores the relation of output index information and output port number for the internal cell in the form of one-to-one for the unicast and one-to-multiple for the multicast.

Abstract: A unicast/multicast system has an internal cell generating section that generates an internal cell to include its output index information based on user data, and an output port conversion table that stores the relation of output index information and output port number for the internal cell in the form of one-to-one for the unicast and one-to-multiple for the multicast.

Abstract: In a switch provided on a network for transferring data, a switch unit includes a scheduler for setting a switch core and an input port unit includes a data allotting unit for allotting transfer data on a priority basis, buffers provided corresponding to the priorities for temporarily storing and outputting the allotted transfer data, a request aggregating unit for aggregating connection requests related to transfer data which are allotted on a priority basis, allotting the connection requests in accordance with the priorities which are taken into consideration in processing by the scheduler and outputting the obtained requests, and a data aggregating unit for aggregating transfer data output from the buffers and transmitting the aggregated data to the switch core.

Abstract: The present invention relates to a data collection system and a data collection method in a sensor network, enabling sensor modules to consume lower amounts of power. The base station transmits data collection request signals to one or more sensor modules which are lower than the base station by 1 in a tree structure. Each sensor module which has received the data collection request signal transfers the signal to one or more sensor modules which are lower than the module by 1. The base station regards the transfer of the signal as ACK for the data collection request signal transmitted therefrom to the sensor module which is lower than the base station by 1. The transmission of a data collection acknowledgement signal starts from a sensor module at the low-order end. When a sensor module receives the data collection acknowledgement signal from a downstream sensor module which is lower than the module by 1, the module transmits the signal to an upstream sensor module which is higher than the module by 1.

Abstract: A data transmission path establishing method for establishing a data transmission path from each device to a base station independently to thereby form a network with small devices which are required to consume lower amounts of power such as sensors, a radio communication network system and a sensor network system. A base station transmits detection signals to a plurality of radio devices. Each of the radio devices which have received the detection signal transmits detection response signals each including an identifier that uniquely identifies the device and doubling as a response signal and a detection signal for another radio device. Having received the detection response signal from a radio device, the base station recognizes the radio device as a radio device belonging to the station based on the identifier included in the detection response signal.

Abstract: A switch is provided that implements flexible switch scheduling according to priority levels set in data, by means of a simple apparatus configuration. A scheduler provided in the switch includes a request distribution block that distributes transfer data connection requests according to the priority level of the transfer data, a first allocator that performs allocation for high-priority-level transfer data connection requests from among the distributed connection requests, a second allocator that performs allocation for low-priority-level transfer data connection requests, an allocation combination block that combines the results of allocation by the first and second allocators, and a grant generator that sets a switch execution block on the basis of the combined allocation result, and outputs Grant signals; and further includes a request mask block that masks connection requests that duplicate the result of allocation by the first allocator before allocation is executed by the second allocator.

Abstract: To provide an apparatus for releasing a cut-through connection in a network node when traffic on the cut-through connection becomes smaller than a fixed value by monitoring traffic of each of cut-through connections established in the network node without charging large load on software processings, the apparatus for releasing a cut-through connection comprises a timer (21) having time counters each assigned to a cut-through connection and outputting a time-out notification signal (20) when a count value of the time counter has attained to a time-out threshold value determined corresponding to the cut-through connection, the time counter being incremented along with time passage and being reset when the cut-through connection is established and when a cell of the cut-through connection arrives to the network node.

Abstract: A method for transferring a series of layer-3 packets through an ATM network composed of a plurality of ATM switches is disclosed. An ingress gateway determines whether a packet flow has been registered and, when the flow has not been registered, determines a transfer route. A connection setup cell is transmitted to a next-hop ATM switch to ensure a connection dedicated to transfer of tho series of packets. Then, a series of packets is transferred to the next-hop ATM switch through the connection after the connection has been set up.

Abstract: To provide an apparatus for releasing a cut-through connection in a network node when traffic on the cut-through connection becomes smaller than a fixed value by monitoring traffic of each of cut-through connections established in the network node without charging large load on software processings, the apparatus for releasing a cut-through connection comprises a timer (21) having time counters each assigned to a cut-through connection and outputting a time-out notification signal (20) when a count value of the time counter has attained to a time-out threshold value determined corresponding to the cut-through connection, the time counter being incremented along with time passage and being reset when the cut-through connection is established and when a cell of the cut-through connection arrives to the network node.

Abstract: The access network manager terminal 5 makes a communication quality agreement with the core network manager terminal 3, the core network manager terminal 3 conducts resource assignment of the core network 100 based on the communication agreement, notifies the access network manager terminal 5 of password information of the assigned resource and notifies the edge router 1a of password authentication information. The user terminal 4a communicates a password sent from the access network manager terminal 5 in response to a resource use permission request as being contained in a header of a packet and the edge router 1a authenticates the password of the packet based on the password authentication information.

Abstract: Disclosed is a system for scheduling reservation of traffic with priority, in which each of input ports detects the reserved addressed output port for a high priority traffic by detecting signaling of the traffic and notifies the reserved addressed output port to a scheduler, the scheduler sets a switch connection for passing the high priority traffic with priority every time slot and assigns other switch connections to best effort traffics, and when the switch connections are determined, outputs grant signals to input ports and setting signal to a switch.

Abstract: A caching method for caching network contents of a packet transfer network including a packet relay for relaying accesses of clients to servers supplying contents, and a network contents cache device are disclosed. Accesses from the clients to the servers are monitored by the said packet relay to determine a cache priority on the basis of a product of relaying path lengths from the packet relay to the server and frequency of access from the client to the servers and the network contents cache device preferentially caches a response to the access to the server having higher cache priority.

Abstract: A segment and reassembly system cooperates with a data processing system for various kinds of data processing on ATM cells accumulated in frame buffers, and supplies ATM cells to ISDN after completion of various kinds of data processing; wherein the segment and reassembly system has processing units connected through exclusive interfaces to engines incorporated in the data processing system, and the engines process the pieces of data stored in the frame buffers at high speed, thereby improving the throughput of the segmentation and reassembly system.

Abstract: An internet protocol (IP) layer processor has an IP header processing section for checking a defect in an IP header of a first ATM cell of an AAL5 frame, and a SAR (segregation and reassemblage) section for transferring the AAL5 frame in the form of separate ATM cells if the check by the IP header processing section indicates a normal IP header, without using a CPU. SAR notifies a defect in the IP header to CPU without transmission of the AAL5 frame if the check indicates the defect in the IP header. The IP layer processor achieves a higher processing due to the direct transfer by the SAR without using processing by a software.

Abstract: A QoS server having an affinity to a protocol such as MGCP, capable of cooperating with applications without causing a delay in call setup and performing optimum QoS resource allocation is provided. A QoS server is provided with a network monitoring section for monitoring the network state, a network state database for storing network state information obtained at the network monitoring section, a resource allocation computing section for computing resource allocation for an application based on resource requirements with reference to the network state database, a resource allocation database for storing resource allocation information, and a network setup section for setting up the resource allocation on the network based on the resource allocation information.

Abstract: A sender transmits performance monitoring packets to a receiver via a network either prior to or in the midst of transmission appropriately, for monitoring communication quality (a communication delay, for example) of the network. A result of the monitoring is judged from returned performance monitoring result packets, whereby priority classes of communication packets are decided to perform subsequent transmission.

Abstract: A packet switch includes (a) a plurality of inputs into each of which a packet is input, (b) a switch which receives the packet from the input and switches an output through which the packet is transmitted, and (c) a scheduler which controls the switch. The scheduler (103) includes (c1) a shuffler (201) which shuffles an order of precedence in a first request transmitted from the input to transfer the packet, (c2) a schedule algorithm (202) which determines the output, based on the first request having the order of precedence having been shuffled by the shuffler, and produces a second request to transfer a packet which second request is associated with the first request having the order of precedence having been shuffled by the shuffler, and (c3) a re-shuffler (203) which turns an order of precedence of the second request to be identical with the order of precedence in the first request as found before having been shuffled by the shuffler, and returns the thus turned order of precedence back to the input.

Abstract: In an ATM network, each logical subnetwork comprises a server for resolving an ATM address using layer-3 address of request message and routing a packet to the network by using a layer-3 address of the packet. A source client examines a layer-3 header of a packet to determine whether its mode of transmission is connection-oriented or connectionless, and transmits the packet, if it is connectionless, to the server for causing it to route the packet through the network, and transmits, if the packet is connection-oriented, an ATM address resolution request message to the server. The source client receives a reply message from the server containing a resolved ATM address, and transmits a signaling message containing the resolved ATM address to the network to establish a connection. Over the established connection, the source client transmits data packets.

Abstract: The present invention is to provide a cell discard control system for an ATM (asynchronous transfer mode) cell buffer capable of preventing useless cells which are not restored to an original packet from being transmitted to an ATM network and minimize a discarded number of packets which should not be discarded.