370 results about "Star network" patented technology

A system and method are disclosed for providing a high speed wireless network. In one embodiment, a network is configured in a star configuration having a single router at the center. A Metropolitan Access Network (MAN) is configured with a plurality of access points that provide a wireless interface using defined physical layer and Media Access Control (MAC) layer. Packet data delivered to and from the access points are connected to the single router using a plurality of layer two links, which may include point to point links and packet switches. All links within the network operate at layer two or below and do not modify the packet data. The single router at the center of the MAN star network uses layer three information to direct packets between Local Area Networks (LANs) or sub-networks connected to different ports on the router.

The invention relates to an internet of things networking method and a system thereof. The system comprises an internet or mobile internet, a plurality of network elements connected with the internet or mobile internet in parallel, clients respectively communicated with the internet or mobile internet, and a cloud server. Each network element comprises a network element controller, and a plurality of devices which are of a star network topological structure and are contacted with the network element controller. The relevant information of the devices in the network element is stored in the cloud server. The clients can directly operate the network element controller, or visit and control the devices in the network element through the internet or mobile internet, or place the devices under trusteeship through the cloud server to realize the automatic and intelligent management of the devices. The internet of things constructed by the invention is an open and diversified network, users can control and monitor any device and can inquire and share information as long as the device joins in the network, and thereby the automatic control, the user control under trusteeship and the authority-based information share in the entire network are realized.

The embodiment of the invention provides a multi-core DSP (digital signal processor) system-on-chip and a data transmission method. The system comprises a main processor, multiple slave processors and an external memorizer, wherein each main processor and slave processor respectively comprise a processor core, a memorizer-on-chip and a direct memory access (DMA) controller, the main processor controls and accesses the external memorizer through an I/O (input/output) controller, data exchange can be realized among processors through an internet-on-chip, wherein the internet-on-chip is composed of a star network, a loop network and a serial network. The internet-on-chip provided by the embodiment of the invention combines the star network, the loop network and the serial network, so that the internet-on-chip can not only provide streaming data transmission with high bandwidth, but also provide short message transfer with low delay. Besides, the embodiment of the invention simplifies the access arbitration of the external memorizer through the software control of the main processor, reduces the synchronous operations among the multi-core processors through the network data buffer and lowers the complexity of the program design of the multi-core processors.

The invention discloses a star quantum key distribution network without a trusted relay based on a MDIQKD protocol. The star quantum key distribution network disclosed by the invention is expanded into a star network structure based on a point-to-point MDIQKD system; therefore, network resource consumption is saved; and the difficulty due to network expansion can be solved. According to a light source structure provided by the invention, equipment used in a time feedback scheme, a phase feedback scheme and a polarization feedback scheme is simple and reusable; therefore, the quantum key distribution network is relatively simple, relatively easy to integrate and low in cost; furthermore, feedback requirements can also be reduced through further optimization; and thus, the foundation is laid for further realizing safety, high-speed, large-scale engineering treatment and practicability of quantum secret communication.

The invention relates to the technical field of synthetic aperture radar interferometry, and specifically relates to a PSInSAR estimation method applicable to complex urban area infrastructure in windy and rainy conditions. The method includes following steps: performing data preprocessing on InSAR data; establishing a Delaunay triangulation network and an adaptive encryption network; estimating an arc segment relative parameter through a robust estimator; performing Tikhonov regularization adjustment operation; establishing a local star network; recognizing single PS points and layover PS points; calculating the single PS points in remaining pixels through the robust estimator, and detecting the layover PS points through a compressed sensing algorithm; and outputting heights and deformation results of the single PS points and the layover PS points. According to the method, combined calculation of the single PS points and the layover PS points is realized through mixed network establishment without removing the atmosphere in a global manner, a temperature non-linear deformation model is introduced, the fitting degree of the time sequence phase is improved, accurate estimation of the PS points is realized by employing the robust estimator, and the layover PS points of the complex urban environment are extracted by employing super-resolution MD-TomoSAR imaging.

One embodiment provides a system for noise addition to enforce data privacy protection in a star network. In operation, participants may add a noise component to a dataset. An aggregator may receive the noise components from the plurality of participants, compute an overall noise term based on the received noise components, and aggregate values using the noise components and overall noise term.

Some embodiments dynamically designate one of several network nodes as a network hub of a star network, at the start of a network communication session among the several network nodes that is facilitated by a mesh network and the star network. Some embodiments dynamically designate a new network hub when the previously designated network hub leaves the communication session, which continues among the other network nodes. Different embodiments use different techniques to dynamically designate the network hub of the star network. For instance, some embodiments use communications transmitted along the mesh network to dynamically identify the network hub at the start of the network communication session or after the departure of a previously designated network hub.

The invention discloses a parameter adaptive adjustment method of a wireless sensor network. A star network topological model is used; the sensor network is composed of a sensor node and a coordinator; the node is used for collecting sensor data; and the coordinator is taken as a convergence device of the whole sensor network, and is used for collecting the sensor data uploaded by the node. An 802.15.4 protocol based on a time slot CSMA/CA is adopted in communication of the wireless sensor network, and a Q-learning algorithm is used to dynamically optimize parameter settings of the protocol, so that the problem of adaptability of the 802.15.4 protocol to a position network environment can be effectively solved; while the quality of network service is improved, the overhead of the network is effectively reduced; and thus, the parameter adaptive adjustment method is an optimization method of the wireless sensor network with strong adaptability, high timeliness and good quality of service.

This invention relates to greenhouse variable structure self-organizing wireless sensor network and its building method, which sets up the convergence nodes during the mobile process, the sensor and control nodes within the coverage to form Star network, and then the convergence nodes connects the control site and control center in turn. It lays the plastic track and wire of toughness as Live Wire lanyard on the top of greenhouse, fixes the aggregation nodes on the lanyard with both ends of wheel connecting electricity, installs cooling fins and fans on the aggregation nodes, to dynamically collect the greenhouse surrounding parameters acquired by different sensor nodes through aggregation nodes, and then sent to the control site, and the instructions issued by the control site is sent to the control nodes through the aggregation nodes.

A photonic integrated circuit (PIC) device is described. The PIC device includes a set of optical transceivers including optical transmitters and optical receivers, and an embedded optical interconnect mesh operatively associated with the set of optical transceivers and structured to enable at least one of the following network architectures: a star network architecture, a bus/broadcast network architecture, and a ring network architecture. Related apparatus and methods are also described.

A logical star architecture imposed on an underlying non-star network, for example a Virtual Path Ring (VPR), enhances a mesh protocol with an automatic method for Virtual Path ID (VPI) generation. The VPIs are used by the mesh protocol's inherent routing function to effect automatic configuration at installation, automatic reconfiguration at node updates, and automatic reconfiguration for protection switching. The imposition of the logical star architecture on a VPR reduces node-to-node switching costs (e.g., delay, as well as memory and processing costs) since all nodes in a logical star topology are at most two logical hops away. The logical star also conserves virtual path address space relative to a fully configured ring. Additionally, the imposition of the logical star architecture allows existing star functions to be deployed on the underlying network. Finally, when the underlying architecture is a ring, the protection advantages of ring networks can be preserved.

The present invention provides a network topology structure on a star-cluster double-loop (SCDL), and the structure consists of 4m*2k processing units and 4m switching nodes, wherein, each 2k processing units are connected to form a star network topology structure, therefore, 4m star structures are formed; switching nodes of the 4m star structures are connected to form DL (2m) interconnection network topology structures. The present invention has the characteristics of canonicity, symmetry, planarity, excellent extendibility, lower network cost, simple switching nodes and simple routing policy. According to the present invention, a switching node is connected with four processing units, therefore, communication distance between processing units is reduced, localization feature of the system is improved, delay of the system is reduced and throughput of the system is improved. A novel Johnson coding method can be adopted by the switching nodes and processing units of the present invention, and the method make the coding of the switching nodes and processing units imply information of adjacent nodes and links of the interconnection network; therefore, the route algorithm design is simple.

The invention discloses a star-network-based BDS/GPS broadcast type network RTK algorithm. All base stations form a triangulation network based on a Delaunay triangulation algorithm; and a controllable full-region star network formed by a plurality of star network elements is generated based on the triangulation network. Data of the base stations are obtained in real time and network element calculation is carried out to generate a baseline atmospheric error. Meanwhile, a server side broadcasts a main station observation value, a base station coordinate and the baseline atmospheric error to auser by using the star network as a unit based on a UDP protocol; the user selects one network element based on an own approximate position and the position of the main station; interpolation is carried out on an inter-station single-difference atmospheric error of the baseline formed by the user and the main station and the obtained atmospheric error is corrected to the observation value of the main station to carry out baseline calculation. Besides, the user also can uploads an approximate coordinate by two-way communication and the server side broadcasts difference data of the network element in which the user is located. And difference data broadcasting by equipment like ground equipment, an aircraft or a satellite is also supported.

The invention discloses a satellite communication networking system and a working method thereof. According to the technical scheme, communications are conducted among a central satellite master station, a distributed-type central satellite station, and a common satellite station through an asynchronous time division multiple access network; an acentric and asynchronous accessing mode is adopted in the asynchronous time division multiple access network, a time division multiplexing mode is adopted in a forward link, and the asynchronous time division multiple access network is applicable to a star network and mesh network topological structure networking form; communications among a small-aperture antenna satellite station and other satellite stations are conducted through a small-aperture antenna satellite station backhaul network; the small-aperture antenna satellite station backhaul network receives forward carrier wave data of the asynchronous time division multiple access network and is used for forward communication of the small-aperture antenna satellite station and receiving of high-speed large capacity data, a reverse link is hauled back through an individual carrier wave, and multiple access is achieved since the reverse link supports code division multiple access, frequency-division multiple access and time-division multiple access networks. According to the satellite communication networking system and the working method thereof, dynamic regulation management of system sources can be conducted according to changes of transmitted business data.

The invention discloses an electric power carrier communication routing method. A network node needing routing broadcasts a routing request message to surrounding nodes, each middle node records the address and the routing cost of a next hop in a respective routing table, after the request message arrives at a destination node through a certain path, the destination node selects an optimal path according to different routing costs of different paths, and the destination node initiates a routing response and the routing response can return back a source node through the shortest path. According to the method provided by the invention, a routing cost algorithm in an MESH routing technology is realized. The nodes in a network have a relay function, so that the problem that repeaters are required to be additionally added in a star network architecture is solved. Under the strong support of the MESH network topology structure and each full-function network node, each node in the method further has an ad-hoc networking function, along with the change of environments, the node can flexibly choose routing according to the routing cost among the nodes, and thus, the condition that a path is optimal in any environment at any time can be guaranteed.

A star network (1) having a star coupler (14) and at least a first and second network branch (112, 122), wherein each network branch (112, 122) comprises at least one network node (110, 120) and a bus driver (11, 12) connected between the star coupler (14) and the at least one network node (110, 120). A first bus driver (11) of the first network branch (112) is adapted to detect a symbol pattern comprising at least two predetermined equal control symbols, which are transmitted from the first network node (110) to the second network node (120), wherein a control symbol is part of a control pattern. The control pattern is used to force at least the second network node (120) to switch into a predetermined state. The first bus driver (11) is disabling the first network branch (112) from the star network (1) based on whether the transmitted symbol pattern is detected. By using the protection mechanism a reliable detection of babbling idiots is provided. Moreover, in case of detecting such babbling idiots the remaining network nodes are separated and the network can operate without being influenced by the faulty network node.

An airborne ultrashort wave multimedia communication system comprises a communication central station and a plurality of client terminal stations, wherein the communication central station is communicated with each client terminal station in an ultrashort wave wireless channel two-way mode, the communication central station, the client terminal stations and ultrashort wave wireless channels are together combined to form a star network framework, the communication central station and the client terminal stations are communicated directly, and the client terminal stations are mutually communicated and connected through the communication central station. The airborne ultrashort wave multimedia communication system is suitable for reliable stable networking communication under the conditions of helicopter airborne high-speed high dynamic and high-complexity terrain environments and supporting a plurality of communication nodes to construct multiple service communications such as networks, supporting images, telephones and data in a star networking mode. The airborne ultrashort wave multimedia communication system can be not only used under certain environments of landing ground of an aerospace engineering returning capsule, but also used under the conditions sun as salvage, mountain area rescuing, real-time reporting of city large-scale activities and competitions and the like.

The invention discloses a local dormancy awakening method for a CAN bus star network management architecture scheme. The method comprises the following steps that a CAN network management message anda plurality of controllers corresponding to multiple operations are provided, wherein the CAN network management message is based on an OESK network management message format and is provided with a destination address (DA) and a network management state bit CF; and when a vehicle executes the operation, only the controller related to the operation is awakened by the CAN network management message,and the controller unrelated to the operation is not awakened and is still in a dormant state in order to reduce the number of the awakened controllers. According to the method, the number of the awakened controllers is reduced to the minimum value through the local network dormant awakening, and the lack of electricity of a storage battery is effectively prevented.

The invention relates to a remote wireless meter reading system, which comprises a plurality of wireless meter reading terminals which form a star network with floor concentrators as centers, a plurality of floor concentrators form a tree network and upload data or parameters through a relay partially, a plurality of building concentrators form the tree network, wherein each building concentrator is taken as a root node of the tree network composed of a plurality of floor concentrators and uploads the data or the parameters through the relay partially, a district data terminal is taken as the root node of the tree network composed of a plurality of building concentrators and is communicated with the building concentrators without the relay directly, and the district data terminal is also communicated with a remote host machine through a wired network. The system takes meters used by each user of the district as basic applied objects, a multilayer radio transmission structure is adopted in the district range to receive data, the data is converged into the district data terminal, then, the wire network is utilized to report the data, and thereby the system has the advantages of flexibility, accuracy and reliability.

The invention discloses a template based task scheduling strategy in a cloud computation environment. The template based task scheduling strategy includes: establishing a star network; allowing an initial position to be at a scheduling node P when a task reaches a cloud platform; acquiring mappings of each task and each processor through the scheduling node by adoption of a sum scheduling algorithm according to the states of a current task set and a current processor cluster; and then sending each task to one corresponding processor through the network and operating each task, wherein the end time of task operation is the finish time T of the task generated by the scheduling algorithm. The beneficial effects of the template based task scheduling strategy are that: a new task scheduling method is provided from a new view; compared the conventional method, the method performs pretreatment on parameters, obtains an optimal template from a whole situation, and performs a target scheduling; and the finish time of the task set can be greatly optimized in the cloud computation environment.

According to the structure characteristic of an alternating current region power supply system of a ring-shaped bus, through improvement on several short circuit computing methods which are widely used in the prior art at home and abroad, the original short circuit current computing method for a tree-shaped power grid is deformed into a short-circuit current computing method suitable for a ring-shaped ship power grid. The method comprises the following steps of: firstly, computing the short-circuit current of a simple grid by a star-network transformation and local equal effect method; and secondly, providing a method in which a line impedance matrix is obtained by a graph theoretic approach and then the short circuit current is calculated. According to the method, the short-circuit current computing method for a ship ring-shaped region power distribution system can be explored, the thermal stability and power stability checkout when types of the equipment are selected can be realized, and the basis can be provided for fault protection when the equipment runs.

The invention discloses a message routing method based on MQTT (Message Queuing Telemetry Transport) multi-layer cascade. The method comprises the steps of performing MQTT-based multi-gateway networking; performing routing down based on the MQTT-based multi-gateway networking, to route a message sent by an MQTT control end to a household appliance; and performing routing up based on the MQTT-based multi-gateway networking, to route a feedback message of the household appliance to the MQTT control end. The method improves the centralized star network topology of an MQTT protocol, supports the gateway topology of multi-layer cascade, supports multi-gateway connection networking and message routing, solves the problems of multi-gateway connection, communication and management of current smart home, and supports dividing household appliances into different areas for secure and fast internal network control and small-range management according to custom rules in the family.

The invention discloses an intelligent streetlamp control system. The intelligent streetlamp control system comprises a control terminal, a server, a wide area network, an intelligent streetlamp local area network and an intelligent LED streetlamp, wherein data exchange between the control terminal and the intelligent streetlamp local area network is performed by the server and the wide area network so as to control a single intelligent streetlamp connected to the intelligent streetlamp local area network, the intelligent streetlamp local area network adopts a radio frequency wireless communication mode based on 780MHz and is combined with a fundamental layout of a star network architecture, a few sources interfering a wireless channel and stable and reliable signal transmission are ensured, the consistency in time of issuing operation commands of turning on/off the lamp and dimming is also ensured, the site control effect is uniform, and no obvious delay is generated; and meanwhile, a single lamp controller, a gateway controller, a concentrated controller and a data acquisition module are integrated in the intelligent LED streetlamp, an adjustment instruction of the control terminal can be received, ambient information can also be acquired as a feedback, and intelligent city management is achieved.