Example embodiments provide apparatus, systems and methods to optimize a multicasting operation used to transmit data packets in a communication network. A data store stores at least one variable parameter associated with the multicasting operation. A communication transceiver multicasts a data packet to a plurality of nodes in a communication network using the stored variable parameter and receives, from a node of the plurality of nodes, a retransmitted version of the multicast data packet, the retransmitted data packet comprising feedback data. At least one processor coupled to the data store and the communication transceiver determines, using the feedback data, that the variable parameter requires modification to optimize the multicasting operation for the network, modifies the variable parameter in response to the feedback data; and stores the modified variable parameter in the data store.

In one embodiment, a device in a network receives a notification from a neighbor of the device indicative of a child node of the device requesting a parent change from the device to the neighbor. The device updates an existing routing path from the device to the child node to be routed through the neighbor, in response to receiving the notification from the neighbor. The device receives an instruction to remove the updated routing path from the device to the child node through the neighbor. The device removes the updated routing path from the device to the child node, in response to receiving the instruction to remove the updated routing path.

The invention relates to a method for configuring a network comprising several nodes. According to the invention, at least one node of said network, called a current node, implements a step of building a relay table identifying at least one node of the network, called a relay node, which is directly connected to the current node and which has at least one parent node in common with at least one parent node of the current node.

A system includes a control system. The control system includes a processor configured to receive a first signal from a light source within an industrial facility. The first signal includes a unique identification code configured to indicate at least a partial identity of a human resource within the industrial facility. The processor is configured to determine a proximity of the human resource with respect to the light source based at least in part on a received signal strength indicator (RSSI) of the first signal, and to generate an indication of a location of the human resource within the industrial facility based on the determined proximity of the human resource to the light source.

An information processing system includes a plurality of switches connected to each other in a form of a full mesh and a plurality of information processing apparatuses respectively connected to any one of the plurality of switches. A first information processing apparatus of the plurality of information processing apparatuses includes a processor. The processor is configured to generate a second identifier by calculating an exclusive OR of a first identifier and a first number corresponding to a communication phase. The first identifier identifies a first switch connected to the first information processing apparatus. The first number is included in a set of linearly independent numbers allocated to the first information processing apparatus. The processor is configured to perform communication with a second information processing apparatus of the plurality of information processing apparatuses. The second information processing apparatus is connected to a second switch having the second identifier.

A satellite communications system can use a spread-spectrum waveform and format, a synchronization scheme, and/or a power management algorithm. This approach can provide benefits such as allowing every terminal to communicate with every other terminal, link margin permitting. This gives the network a mesh topology although it can be configured in a star topology for highly asymmetric applications. A further understanding of the nature and the advantages of particular embodiments disclosed herein may be realized by reference of the remaining portions of the specification and the attached drawings.

A network system for a data center is described in which a switch fabric provides full mesh interconnectivity such that any servers may communicate packet data to any other of the servers using any of a number of parallel data paths. Moreover, according to the techniques described herein, edge-positioned access nodes, optical permutation devices and core switches of the switch fabric may be configured and arranged in a way such that the parallel data paths provide single L2/L3 hop, full mesh interconnections between any pairwise combination of the access nodes, even in massive data centers having tens of thousands of servers.

A network system for a data center is described in which a switch fabric provides full mesh interconnectivity such that any servers may communicate packet data to any other of the servers using any of a number of parallel data paths. Moreover, according to the techniques described herein, edge-positioned access nodes, optical permutation devices and core switches of the switch fabric may be configured and arranged in a way such that the parallel data paths provide single L2/L3 hop, full mesh interconnections between any pairwise combination of the access nodes, even in massive data centers having tens of thousands of servers. The plurality of optical permutation devices permute communications across the optical ports based on wavelength so as to provide full-mesh optical connectivity between edge-facing ports and core-facing ports without optical interference.

A network system for a data center is described in which a switch fabric provides full mesh interconnectivity such that any servers may communicate packet data to any other of the servers using any of a number of parallel data paths. Moreover, according to the techniques described herein, edge-positioned access nodes, permutation devices and core switches of the switch fabric may be configured and arranged in a way such that the parallel data paths provide single L2/L3 hop, full mesh interconnections between any pairwise combination of the access nodes, even in massive data centers having tens of thousands of servers. The access nodes may be arranged within access node groups, and permutation devices may be used within the access node groups to spray packets across the access node groups prior to injection within the switch fabric, thereby increasing the fanout and scalability of the network system.

Systems and methods for communication between near field communication devices within a target communication region using near field magnetic induction is disclosed. One method comprises generating a near field detectable signal at an active node having a power level sufficient to enable communication with a plurality of near field communication nodes located within the target communication region. Information is modulated onto the near field detectable signal using at least one of the near field communication nodes. The modulated information is detected at the active node. The information is then relayed on the near field detectable signal from the active node to at least one of the plurality of near field communication nodes within the target communication region.