144results about How to "Reduce the number of hops" patented technology

A method and apparatus for route aware network link acceleration provides a managed communication channel for accelerated and reliable network communication between a client and other network devices as needed. The communication channel may comprise one or more segments having increased speed, reliability, security, or other improved characteristics as compared to traditional communication links. Network traffic may be routed through one or more of the segments based on various criteria to improve communication of the traffic. In one embodiment, the segments may be arranged in a daisy chain configuration and be provided by one or more chaining nodes.

The embodiment of the invention discloses a method for distributing cloud computing resource, a device thereof and a system thereof which are applied to a network which comprises a client, a decision-making entity and a plurality of front cloud servers. According to the embodiment of the invention, a first front cloud server in the plurality of front cloud servers receives a cloud application service request sent by the client, the first front cloud server is a front cloud server which provides cloud application service to the client, and the first front cloud server is determined by the decision-making entity according to the position information of the client, the state information of the plurality of front cloud servers and / or the corresponding network link state information between the client and the plurality of front cloud servers. The corresponding cloud application calculation processing is carried out according to the cloud application service request, the result of cloud application calculation processing is returned to the client, and the network delay and packet loss probability of a cloud calculation application can be reduced.

A peer-to-peer cache architecture stores peer address certificates in different cache segments according to the number of IDs being stored and their relative distance in the peer name space. The cache instantiates regions of decreased range and increased granularity as additional information from close peers is learned. In a large peer cloud where the number of instantiated IDs is not known, each succeeding cache region covers one tenth of the preceding cache region. For peers with multiple IDs registered locally, the segmented cache of the present invention combines overlapping segments of the same granularity to eliminate the duplication of information that would otherwise occur. A cache tree, an instantiated segment tree, and an uninstantiated segment tree are arranged in red-black trees to simplify the search and proper placement and instantiation of information.

The invention describes a method of establishing a wireless multi-hop network (NW), in particular a ZigBee-type network, comprising a plurality of devices (0, 1, 2, . . . , 96) of a device arrangement (D), in which method devices (1, 2, 3, . . . , 96) establish a physical wireless connection to at least another device (0, 1, 11, 16, 17, 29, 30, 39, 48, 52, 53, 55, 64, 71, 73, 79, 88) of the network (NW) in a self-organizing process. In the self-organizing process a seeking device, intending to join the network, listens for beacon signals emitted by candidate parent devices already in the network comprising a network identifier and a device identifier of the emitting devices. Then, in a parent selection process, the seeking device selects a parent device from among the candidate parent devices, according to given selectionrules, based on the network identifiers (EPID), acceptance capabilities of the candidate parent devices, and link quality parameter values relating the device and the candidate parent devices. In this parent selection process application-level connection data (L, BI) of the seeking device and / or the candidate parent devices are applied. At least, the seeking device connects physically, and preferably also logically, via the selected parent device (0, 1, 11, 16, 17, 29, 30, 39, 48, 52, 53, 55, 64, 71, 73, 79, 88) to the network (NW). The invention further describes a device comprising a network inter-face for connecting a wireless multi-hop network (NW) according to this method.

The invention discloses an internet of things (IoT) error sensor node location method based on an improved Q learning algorithm. The method is characterized in that the traditional Q learning method is improved to make calculated Q values adaptively change according to characteristic information such as residual energy of a sensor node, routing and transmission hop count, a routing path is established by means of a maximal Q value, meanwhile, a background server works out a network topological structure, when the node is attached or produces error data, an error range is set by comparison with the Q value of the node of the next period, and when the range is exceeded, the node is judged to be the error node and is located. According to the invention, extra energy of the sensor node does not need to be consumed, and when a wireless sensor network topological structure changes, higher robustness is also achieved; and the method has the advantages of intelligent property, low energy consumption, high adaptive degree and the like, can be used to not only routing, location and energy consumption performance evaluation of the sensor node but also accurate location of unknown error nodes, and has wide application values.

The invention provides a stable clustering routing method based on link perception in a vehicle-mounted self-organizing network, and belongs to the technical field of vehicle-mounted self-organizing networks. The node similarity S, the intimacy IN between nodes and the connectivity D between the nodes in an Affinity Propagation clustering method are utilized for calculating node priority, and the node with the top priority becomes a cluster head; after clustering, according the node link perception method, information disconnection is carried out in a crossing trigger link; a crossing node calculates re-communication probability according to making and breaking of a road segment in last k periods, the crossing node utilizes the re-communication probability and a greedy method for selecting the optimal candidate cluster, and gateway nodes reaching the optimal candidate cluster are selected according to the greedy method. According to the method, the delivery rate of a data package is obviously improved, time delay required by delivery of the data package is reduced, stability of the cluster head is increased, the number of the cluster head is reduced, the hop count and the average delay of data transmission are reduced, and the routing expenses are greatly reduced.

A method for controlling a powertrain of a vehicle with wheels during a traction control event is provided. The method comprises adjusting wheel torque in response to an amplitude of a band-pass filtered driven wheel speed and a direction of acceleration of driven wheels.

A distributed index for discovering distributed data sources and computing resources based on predicates on attributes is provided. Proposed is a non-altruistic scheme for indexing distributed data, in which nodes are provided with incentives to cooperate in the referencing of data and the routing of search requests for indexed data. Indexed data is mapped to a dynamic routing graph, in which nodes earn credits each time they route a search request. Participatory nodes along a search request traversal continually modify local routing decisions in a manner necessary to maximize profit. Thus, routing paths as a whole are able to dynamically adapt to changing query workloads and access patterns. Dynamic adaptation also occurs by automatic load-balancing of recipients of frequently routed searches, known as “hot spots”, for frequently request data, “hot items”, as a result of an incentive to replicate the indexing strategy of a more profitable node.

The invention discloses a data collecting method applied to a multihop wireless sensor network, which belongs to the wireless communication network field and mainly solves the problems that the efficiency is low, the time lapse is big, and the network service life is short in prior network data collection. The data collecting steps include as following: executing clock synchronization to the local network nodes, and updating the local network information of the network nodes; dividing the network work time into a plurality of network interception periods; utilizing the updated localized network information to work out the interception signal channel probability of the nodes; executing interception at each network interception period according to the interception signal channel probability; executing data transmission according to the contest transmission nodes transmitted by the generating data; executing the data receiving according to the frames hearing the busy signal contest receiving node; and transmitting the data to the syntaxis nodes SINK used for collecting the data through multihops. The method has the advantages that the data collection is in time, and the nodes are high in efficiency and good in expansibility, thus being applicable for collecting data information in a large-scale wireless sensor network for monitoring emergency accidents.

The invention discloses a novel neighbor finding method based on a directional antenna. The neighbor finding method comprises the following steps that binary system numbering is carried out on nodes, the antenna scanning direction is numbered, one node determines a receiving and sending mode according to the binary system number of the node, determines the scanning sequence according to the receiving and sending mode and carries out scanning at the neighbor finding stage according to the scanning sequence, and if a pair of receiving and sending nodes successfully come to a handshake protocol, it is shown that the neighbor finding process is successful. The novel neighbor finding method solves the problem of neighbor finding of the non-central networking under the condition of the directional antenna, the advantages of the high interference resistance and high space reused ratio of the directional antenna can be exploited to the full the flexible characteristic of entering and existing the network of the non-central networking are fully utilized, and the method has wide application prospects.

The invention discloses a data collection method based on AUV position prediction in an underwater sensor network. The data collection method comprises the following steps: the AUV cruises in the network according to a pre-determined helical orbit to perform data collection and adjusts the orbit, wherein the helical orbit can be decomposed into circling motion on the horizontal direction and a uniform linear motion on the vertical direction, a node calculates whether itself is within the collection area of the AUV according to its own position and the orbit of the AUV, the node within the collection area waits for the AUV to arrive at vicinity of the node and performs with the AUV, and the node beyond the collection area forwards data to the collection area through multiple hops. The data collection method supports the AUV to cruise in the network to perform data collection, thereby reducing the energy consumption of the node, and the AUV does not need to broadcast a data packet while cruising in the network, thereby reducing the communication cost.

A controller apparatus of this invention includes a topology information managing unit configured to manage topology information showing a topology, a location information acquiring unit configured to acquire location information on a plurality of mobile terminals, a link information acquiring unit configured to acquire link information at the mobile terminals, a determining unit configured to determine a way to change the topology, based on the location information, the link information and the topology information, and a transmitting unit configured to generate instruction information for changing the topology, based on the determined way to change the topology, and to transmit the instruction information to a certain mobile terminal.

The invention discloses a genetic algorithm-based three-dimensional static wireless sensor network deployment method, solving problems of low coverage rate, poor connectivity, and high energy consumption and cost in the existing wireless sensor network deployment method and belonging to the technical field of wireless sensor network deployment. According to the method, a three-dimensional space in a target area is divided into a plurality of areas; topological deployment of a three-dimensional static wireless sensor network is carried out in each area by using the genetic algorithm, and wireless sensor nodes in topological deployment are communicated, so as to reach area communication; a minimum spanning tree of each area communication is generated so as to find an optimal base station position; and wireless sensors in a forest three-dimensional space are communicated 100% through intercommunication of optimal base station positions of all areas. The method is used for modeling of a three-dimensional static wireless sensor network topology in a large area.

A peer-to-peer (P2P) overlay network, which comprises a streaming source and a plurality of peers arranged in distribution layers, is arranged such that the total number of distribution layers of the overlay network is reduced. First, the upload capacity of each individual peer is determined and a maximum number of overlay peers to which said each individual peer can upload is calculated. Then, the peers are arranged in hierarchical order in relation to the streaming source on the basis of the maximum number of peers to which each individual peer can upload data. A higher number results in the individual peer being arranged in a distribution layer closer to the streaming source while a lower number results in the individual peer being arranged in a distribution layer further from the streaming source. Thus, the total number of distribution layers of the overlay network is reduced.

The invention discloses an addressing system and method aimed at layering host marking and based on overlaying DHT; structure of each addressing server in the system is identical and is provided with a node accessing and exiting processing module, an information maintenance module, a route searching module, a mapping record information memory module, and an overlaying DHT structure establishing and maintenance module. The addressing method is to set up the overlaying DHT first: non-semantic host identifiers used in the network are hierarchically transformed; area marks indicating the locating area position of each node are added; then each node is divided into different areas, and each area DHT is set up respectively; finally, all the area DHT are overlaid together to constitute a global DHT; when routes are looked for and transmitted, a next hop is chosen in priority in the area DHT based on the overlaying DHT; trans-regional routing times should be reduced to the fully extent to improve routing efficiency; each operation of registration / updating is carried out in two DHT simultaneously to realize equity of load on balance and economy.

The invention discloses an optimization method for wireless mobile network route selection, and belongs to the field of wireless mobile networks. The specific technical scheme includes: according to the number of neighbors of network nodes, dynamically defining local areas in a network in real time, partitioning the nodes with the number of the neighbors larger than a defined value into the local areas with large intensity, routing the nodes in the local areas according to network topology of the local areas of current sending nodes and based on a unisource shortest route, and routing the nodes outside the local areas by adoption of a routing protocol based on geographic locations; and if routing fails, the sending nodes store messages to be sent, and after T time, performing the routing selection again. The optimization method for the wireless mobile network routing selection can be applied to high dynamic wireless mobile networks including vehicle-mounted self-organization networks and the like. According to the optimization method for the wireless mobile network routing selection, the routing based on the geographic locations is fully combined with the routing based on the network topology, the routing based on the geographic locations and the routing based on the network topology are called according to occasions, a message delivery success rate is increased, time delay is reduced, and overall performance of the network is enhanced.

A computer chip including a plurality of routers, each of the plurality of the routers connected to the adjacent routers in the directions of an X axis and a Y axis; and a plurality of intellectual properties, each of the plurality of the intellectual properties connected to only one of the plurality of the routers.

The invention discloses a data encryption routing method for a wide-area quantum cryptographic network, which comprises the following steps of grading a wide area network according to the number of contained metropolitan area networks, and selecting a data encryption routing path between an initial node and a destination node in a graded routing manner, therefore, the network delay is reduced, andthe management of routing nodes is facilitated.

The embodiment of the invention discloses a method, a device and a system for selecting a gateway, which belong to the field of communication. The method comprises the following steps: selecting a service gateway which is integrated with a current local anchor point data gateway as a current service gateway while the service gateway is selected; and selecting a data gateway which is integrated with a current local anchor point service gateway as a current data gateway while the data gateway is selected. The device comprises a service gateway selection module and a data gateway selection module. The system comprises a target mobile management network element. In the invention, the current anchor point gateway is taken as a basis, the gateway which is integrated with the current anchor point gateway as far as possible is selected when the service gateway or the data gateway is selected, thereby the hop count of the data connection is reduced, and the efficiency of transmission data is improved.

The invention discloses a network organization method of systematic searching in a peer-to-peer network video sharing system; each node executes the following steps: (1) the super node list and the neighbor list are initialized; (2) the self-attached super node pattern is decided, and similar super node list is decided from a super node index server; (3) that whether the contact ratio of the index of the nodes of the super node list and the index of the node is smaller is judged; (4) the nodes of small index contact ratio in the super node list is added to the neighbor node list; (5) that whether the interval of the current information sending and the last information sending reaches the exchange cycle is judged; (6) update information and topological maintenance information between the super node and the neighboring node is exchanged; (7) that whether an exit request is received is judged. The method of the invention uses the super node to judge the attached pattern of the node, and adds the node of small index contact ratio in the category to the neighbor node. The method is characterized by quick index speed, stable network topology structure, self-adaptive adjustment based on the interests of the user.

In a radio communication system that includes multiple service areas, each service area is associated with a predetermined number or amount of radio communication resources. Each radio communication resource can be used for a prescribed period of time corresponding to one or more time units. An operator or other entity identifies a set of service areas to be tested at an increased effective load. A desired test level (e.g., increased traffic load) is determined, and a corresponding number of radio resource time units is determined to achieve the desired test level conditions. Use of radio communication resources in the determined one or more time units is blocked for a test period. Performance by each service area during the test period is determined.

The present invention discloses host computer and retransmission unit synchronous switching method, wherein two or more retransmission unit composing retransmission unit set and generating host equipment and spare equipment, each retransmission unit in retransmission unit set respectively connected with host computer and providing service to host computer through host equipment. Said method also includes A, each retransmission unit in retransmission unit respectively notifying oneself current host standby state to host computer; B, host computer according to each retransmission unit notified host standby state to determine host equipment in retransmission unit set, and switching host equipment connected port as host port, through host port re-establishing connection with host equipment. The present invention reduces retransmission message jump number, system time delay, band width, system resources, and interconnection cost through direct connection between host computer and host equipment.

The invention discloses a hierarchical routing algorithm based on a rechargeable multi-base-station wireless heterogeneous sensor network, which comprises the following steps of: deploying and optimizing the positions of base stations in a multi-base-station deploying stage; in the cluster establishment stage, adopting a dynamic clustering mode and selecting luster heads and automatically adjusting clustering by calculating thresholds according to information such as node residual energy and the distance between the node residual energy and a base station; in an inter-cluster route discovery stage, searching for an inter-cluster multi-hop route; in the inter-cluster routing selection stage, selecting an optimal routing path according to factors such as the minimum node residual energy of the path, the hop count from the node to the base station and the total energy consumption of the path; in a data acquisition and transmission stage, enabling a cluster head to transmit data to the base station through an optimal routing path, after a plurality of periods, enabling the whole network to rebuild clusters, carrying out inter-cluster routing discovery and inter-cluster routing selection and cyclically carrying out the steps in this way until the energy of the whole sensor network is exhausted. According to the invention, the network energy consumption can be better balanced, the network life cycle is prolonged, and the hot zone problem is effectively solved.

The invention discloses a high-availability data collection method based on multiple AUVs in an underwater sensor network. The method comprises the following steps: constructing an underwater sensor network model, patrolling, by a plurality of autonomous underwater vehicles AUVs, in the network according to a predefined spiral trajectory for data collection, and periodically adjusting the patrol trajectory; and calculating, by a node, whether itself is within the collection area of one or more autonomous underwater vehicles AUVs according to own location and the trajectories of the autonomousunderwater vehicles AUVs. The node within the collection area performs communication after the autonomous underwater vehicle AUV arriving at the vicinity of the node to upload data; and the node beyond the collection area forwards the data to the node within the collection area through multiple hops. When the autonomous underwater vehicle AUV is faulty, a gateway node discovering the fault broadcasts a control packet and performs fault processing. By adoption of the high-availability data collection method, the energy consumption and the communication overhead of the node are reduced, and thehigh availability of the network is guaranteed.

The invention provides a multi-path routing method based on a resource leveling strategy and applicable to an industrial wireless sensor network, and relates to the industrial wireless sensor network. According to the routing method, the concept of cross-layer design is adopted, comprehensive evaluation is carried out on data receiving and transmitting energy loss of a physical layer and forward queue memory loss of a network layer, and a route priority judgment strategy based on resource leveling factors is disclosed. Meanwhile, with the combination of a breadth-first search algorithm, multiple redundant routes between a data source node and destination nodes are calculated, the requirement for leveling node resources of the industrial wireless sensor network is met, and reliability of communication between the source node and the destination nodes is also improved. An ISA100.11a network is taken as an example, when a system manager in the ISA100.11a network carries out routing path calculation, a preferential path and multiple alternative paths are calculated on the basis of the topology of the current network and resource consumption situations of the sensor nodes, and routing information is distributed and stored in the nodes of the paths, and routing configuration is finished. As is proved, the method is feasible and can reach predicted effects.

The invention aims at providing a method for safely accessing a femtocell into a network, wherein the method is applied in the network comprising a femtocell gateway and an evolutionary packet systemEPS and comprises the following steps: accessing the femtocell into the network, carrying out access authentication on the femtocell by the femtocell gateway, generating femtocell secret key information in the authentication process and transmitting the femtocell secret key information into an MME; generating a user-interface security alliance between the femtocell and a service gateway accordingto the femtocell secret key information by the MME, and transmitting the user-interface security alliance into the femtocell and the service gateway; and accessing the femtocell into the service gateway by utilizing the user-interface security alliance. The invention also provides a system for safely accessing the femtocell into the network. By adopting the method, the femtocell is ensured to access into the network safely, and meanwhile, the hop count of the user interface is reduced.

The invention discloses a software defined network security situation assessment method. The advantages of SDN (software defined network) control and direct and quick information collection are combined, an open SDN security situation assessment framework is provided on account of three kinds of attacks of an SDN forwarding surface, the security framework closely fits a framework of an SDN controller, an anomaly detection module extracts characteristic indexes according to the SDN and various attack characteristics, an SVM (support vector machine) classification algorithm is selected for identification, and attack pre-judgment is given. A security situation assessment module performs quantitative assessment on network security situations according to information collected by the anomaly detection module, and attack sensitivity and noise resistance of an assessment system are regulated through setting of a threshold value. Different weights are allocated to different attacks based on an AHP (analytic hierarchy process) so as to fit out a comprehensive security situation of the network. The method is flexible and simple, attach behaviors can be detected accurately, the quantitative assessment of the security situations of the network is given, and monitoring and assessment of the security status of the SDN forwarding surface are realized with lower cost.

The invention provides a route selection method of minimum hop count based on interference sensing in a wireless D2D network. The method comprises the steps that (1) the emitting power of a D2D node is limited; (2) the highest transmission speed of each hop is computed, and a route optimization model of minimization route hop count is established; and (3) according to an MR-DA algorithm, a route from a source node to a target node is established hop by hop. Under the premise that cellular user communication quality and D2D transmission speed are guaranteed, the route with low hop count is established. By inspecting the highest transmission speed of a candidate node and the target node and the position relation of the candidate node, a current node and the target node, geographical location information and interference control are considered comprehensively, so that the generated router is close to the target node and far away from the base station at the same time, interference on cellular communication is lowered, and the transmission capacity of each hop is increased. Theoretical analysis and simulation results show that the method has the advantages that complexity is low, average hop count is low, and disconnecting probability is low.