41 results about "Wireless mobile ad hoc networks" patented technology

In future large-scale Emergency Response / Management (ER / EM) to terrorism and natural disasters, sharing the so-called common operational picture amongst dynamic task groups provides immediate advantages. In an ER / EM scenario, dissemination of the right data to the right person at the right time has a direct benefit. Timely and bandwidth efficient dissemination of sensor and Command and Control data remains a challenge. For example, dynamically changing mobile teams, information-needs profiling, information routing based upon information needs (not on IP address) are all complex issues. Accordingly, a protocol, called dissemination mesh, for constructing and reconfiguring network paths for disseminating information from sources to sinks, a software architecture for multi-domain wireless network information dissemination in the context of emergency response (resting above existing MANET protocols), supports needs-based dissemination, node mobility, rapidly changing groups (information sinks) and sensor networks (sources) is provided. The protocol includes: exploitation of Semantic Web and collaborative agent technologies, novel subscription-based information dissemination, intelligent networked information intermediaries, smart dissemination mesh forming and management. Together these technologies provide information dissemination management in the wireless setting. Application realms other than ER / EM can also be supported.

A method and apparatus is provided for using a distributed multi-path QoS-aware routing scheme that considers basic MANET characteristics to meet transport service requirements of real-time applications and makes use of multiple discovered paths to calculate a next-hop decision. The QoS Routing scheme superimposes distributed neighborhood congestion, neighborhood density, and link stability and delay information over the multiple discovered paths when the next-hop decision is calculated.

A power saving system in distributed wireless personal area network and a method thereof are disclosed. A PS (Power Save) anchor that provides information about hibernating devices to a beacon group through power save information elements in media access control for a wireless personal area network based on a wireless mobile ad-hoc network. Accordingly, all devices in the given wireless personal area network can schedule their active modes and hibernating modes according to hibernating intervals of destination devices with which the devices want to communicate. This can effectively reduce the necessity of the devices' waiting for the destination devices to awake from the hibernating mode as the devices maintain their idle state, and thus the power consumption of all the devices in the network can effectively be reduced.

The present invention relates to a communication volume regional distribution method in the wireless mobile self organizing network measurement. The procedure is: an aerial vehicle is used to collect data in the air above the target area; the flight track and the investigating area are positioned through the GPS and the wireless network card on the aerial vehicle, the signal intensity of the communication node is measured, and the distance between the communication node and the investigating position is calculated through a signal intensity formula; the central position of the measured communication node is positioned by utilizing position information of the nodes on the two unparallel edges in the communication scope of a communication node and the distance information; the communication volume of various communication node is identified through the communication volume of the communication node on the flight track acquired by the wireless equipment according to the MAC address. The present invention can be applied in the investigation to the military conduction center of the hostile party by a pilotless airplane in the military battlefield environment, and the existence of the hostile party military conduction center is judged through the intensity degree of the communication volume; the present invention can be also used to detect the communication conflict scope of the mobile node, and used for the adjustment, assessment and test of the routing protocol in the wireless mobile self organizing network.

A system and method for information dissemination in a wireless mobile ad hoc network. A method describes receiving a request to communicate a message from a source node to a destination, identifying each neighbor node of an ad hoc network, invoking a proactive border node broadcast protocol at the source node when the destination is a neighbor node and wherein the number of hops to the destination is less than a predetermined number of hops, invoking an on-demand border node broadcast protocol at the source node when the number of hops from the source node to the destination exceeds the predetermined number, and communicating the message from the source node based on the invoked broadcast protocol. A computer readable medium containing a computer program for information dissemination in a wireless mobile ad hoc network is also provided. Finally, a system for information dissemination in a wireless mobile ad hoc network is described.

Time synchronization among nodes in a wireless mobile ad hoc network (MANET) is obtained using a cross layer approach. Each node maintains a routing table that contains entries corresponding to other nodes of the network that are one or more hops away from the node, and topology messages are exchanged periodically among the nodes in order to update their routing tables. A network master node is selected, and remaining nodes that are one or more hops away from the master node are defined as slave nodes. The master node includes master timing information in the topology messages it transmits. The timing information is concatenated to include a first time (T1) at which a topology message was received by the master from each of the slave nodes, and a second time (td) at which the master node transmits a topology message after receiving all the topology messages from the slave nodes.

A system and method for improving digital communication in a wireless mobile ad-hoc network. More specifically, the system includes one or more portable network devices operable to support the seamless operation of a self-initializing, self-healing, adaptive portable network. The portable network devices implement protocols that provide bandwidth management capabilities for use with radios, routers and other wireless network devices. Each portable network device includes at least one wireless transceiver, a processor and control software. The processor and control software are logically coupled to the wireless transceiver to facilitate digital communication via a plurality of communication channels with other network devices.

The invention belongs to the wireless mobile self-organized network technical field, and specifically relates to a timeslot interchange method for achieving a time division multiple address access system in the wireless mobile self-organized network. The timeslot interchange operating method comprises the following steps: sending application timeslot information to the timeslot application node to apply required quantities of mini-slots; evaluating the network load by other nodes in the network and sending release timeslot information by the node satisfying the requirements; selecting the optimal timeslot by the timeslot application node, sending the timeslot acceptation information for confirming, releasing the node release mini-slots by the timeslot release node, and using the mini-slots by the timeslot application node. The free timeslot resource in the network is reasonably distributed by the method; the utilization rate of the network resource is improved; the real time of sending high priority message is enhanced; and the invulnerability of the system is improved.

The invention discloses a topology change sensing method for a wireless mobile ad hoc network. The method comprises the following steps: acquiring all one-hop neighbor nodes from neighbor nodes of a node i according to an effective transmission range of the node, Wherein the node i is any node in the network; Recording and updating information of all one-hop neighbor nodes in the neighbor node information list of the node i; Based on the neighbor node information list, sequentially calculating the topology change degree between the nodes, the topology change degree between the node i and all neighbors, the whole network instantaneous topology change degree and the whole network average topology change degree; In this way, the topological change condition between the nodes of the network isobtained. The method provided by the invention is suitable for complex task scenes and mobile scenes in a high-dynamic mobile ad hoc network, and the nodes can rapidly sense surrounding topology change conditions in the complex scenes; And realizing network local topology change perception and whole network topology change perception by the nodes.

In the method for operating an interference multiple access communications system, wherein the improvement comprises the steps of employing a distributed scheduler within a Media Access Controller (MAC) for Multiuser Detection (MUD) enabled Mobile Ad-hoc Networks (MANETS) to increase spectral efficiency by increasing spectral use and providing a way to dynamically allocate virtual channels to achieve maximum channel reuse in different network topologies and different link patterns and to ameliorate any hidden or exposed node problems.

A method of providing medium access control for a wireless mobile ad hoc network includes defining a TDMA network timing frame including a data (DATA) zone having one or more time slots structured to support multiuser detection (MUD) of concurrent transmissions during each slot, a negative acknowledgment (NACK) zone during which nodes transmit requests for retransmission of packets destined to but not successfully received by the nodes, a broadcast (BC) zone during which network management messages are broadcast to the nodes, and a control (CTRL) zone. A primary master (PM) node is selected and operates as a source of network time for all the nodes. Each node synchronizes its time to that of the PM node during the CTRL zone in a distributed manner, by exchanging control messages with the PM node or other nodes located one or more hops from the PM node.

The invention belongs to the technical field of wireless communication, and discloses a wireless mobile ad hoc network clustering cross-layer communication control method, system and application, andthe method comprises the steps: comparing the maximum throughput when a node uses different communication radiuses, and obtaining the optimal communication radius of the node under the density; periodically dividing the time into a plurality of time slices, and dividing each time slice into a neighbor discovery time period and a data transmission time period; after each node detects the density ofnodes around the node, determining a proper communication radius, and in the data transmission stage, a routing mechanism of a clustering cross-layer protocol HCVCR with the changeable communicationradius being a routing discovery and establishment mechanism based on passive routing AODV. According to the invention, a relatively small communication radius is used in an area with dense nodes, sothat the space division multiplexing efficiency of the area is improved, and the nodes can access a channel more quickly; the sparse area of the nodes enables the communication radius to be large, isolated nodes are avoided, and the overall throughput of the network is improved.

The present invention relates to a communication volume regional distribution method in the wireless mobile self organizing network measurement. The procedure is: an aerial vehicle is used to collect data in the air above the target area; the flight track and the investigating area are positioned through the GPS and the wireless network card on the aerial vehicle, the signal intensity of the communication node is measured, and the distance between the communication node and the investigating position is calculated through a signal intensity formula; the central position of the measured communication node is positioned by utilizing position information of the nodes on the two unparallel edges in the communication scope of a communication node and the distance information; the communication volume of various communication node is identified through the communication volume of the communication node on the flight track acquired by the wireless equipment according to the MAC address. The present invention can be applied in the investigation to the military conduction center of the hostile party by a pilotless airplane in the military battlefield environment, and the existence of the hostile party military conduction center is judged through the intensity degree of the communication volume; the present invention can be also used to detect the communication conflict scope of the mobile node, and used for the adjustment, assessment and test of the routing protocol in the wireless mobile self organizing network.

The present invention discloses a movable wireless route method of self organized network which can ensure the service quality. The present invention aims at the wireless movable QoS route agreement of the self organized network, which induces the applying Qos agree system into the strategic decision as the network bandwidth resource is limited with an unsteady link. The present invention comprises the following steps: (1) expressing the different QoS requirement of the customer such as each QoS index and arrange, the priority of the flow, the network resource require and the lose profit value of the customer to the expressed form which can be handled by the computer; (2) acquiring service quality parameter of the network resource and link through the QoS resource mould; (3) carrying out the agree system according to the QoS require and the valid resource of the network;(4) calculating and finding a special applying QoS route according to the QoS index of the QoS agree system; (5) transmitting an applying flow transmission reflect sheet of controlling mould to control the sending of the applying flow. The present invention can find the route according to the movable index, can maintain and agree the voice video and other applying flow QoS. The present invention can get a large customer profit; and the present invention can ensure the soft transmission quality of the applying flow of the network.

The invention belongs to the technical field of wireless communication, discloses a wireless mobile self-organizing network clustering cross-layer communication control method, system and application, compares the maximum throughput of nodes using different communication radii, and obtains the optimal density of nodes under this density Communication radius; divide time periodically into time slices, in each time slice, divide into neighbor discovery period and data transmission period; after each node detects the node density around itself, determine the appropriate communication radius, In the data transmission stage, the routing mechanism of the clustering cross-layer protocol HCVCR with variable communication radius is based on the routing discovery and establishment mechanism of passive routing AODV. The present invention improves the space division multiplexing efficiency of the area by using a relatively small communication radius in the area where the nodes are dense, and the nodes can access the channel faster; the area where the nodes are sparse enables a larger communication radius, avoiding The emergence of isolated nodes improves the overall throughput of the network.