George Mason University

Samsung Electronics Co., Ltd.

Brian L Mark

Young-Gon Choi

Shubhranshu Singh

Yong-Sung Roh

Alexe E Leu

Jae-Hoon Kim

Jung-ho Kim

Kyung-lim Kang

Vamit Suri

Ahmed Omar Nasif

Melvin H Friedman

Soonyong Sohn

A plurality of road-to-traveler feedback ('RTF') devices integrated with a plurality of electronic computing devices transmits location data to a server. The server transmits to the RTF devices traffic signal timing data based on the location data. RTF devices present suggested velocities based on the traffic signal timing data, such that if a traveler conformed to the suggested velocities and other travel-related data, the traveler would position himself into a geographic region on a roadway in which the traveler is ensured to avoid red lights and other traffic impediments. The server is operatively connected to traffic controllers and receives traffic light state data. The server facilitates a plurality of geographic regions based at least on the traffic light state data and detected travelers on roadways, wherein each of the geographic regions are synchronized to allow continuous traffic flow for the travelers positioned therein.

Systems and methods for coordinating travel through traffic lights

An apparatus and method for assigning subchannel(s) for communication between frequency agile mobile station(s) and a frequency agile base station. A received power level may be identified for each subcarrier in a set of subcarriers available for data transmission. A minimum power level needed to establish communications may be allocated. A detection threshold set to avoid interference with other devices currently transmitting on the set of subcarriers may be determined using the minimum uplink power level. A subset of subcarriers not already assigned may be selected where each subcarrier in the subset of subcarriers has a received power level that is less than the detection threshold. A subchannel that satisfies a bandwidth requirement may be formed where the subchannel consists of selected subcarriers in the set of subcarriers available for data transmission between the frequency agile mobile station(s) and the frequency agile base station.

Cognitive channel assignment in wireless networks

A router, implemented in hardware and/or hardware in combination with software for routing packets, so as to limit congestion. The router monitors incoming data flows as well as the queue length of its buffer to control the rate of incoming data flows via a flow controller. The flow controller uses at least one of: a Smith predictor, a proportional-integral controller, a proportional-derivative controller, and a proportional controller.

Router congestion control

An ad-hoc network and routing method that takes account of mobility are provided. The ad-hoc network includes at least one node, which calculates a probability that a neighbor node is present in a transmission range of the node, generates a message containing the calculated probability, and transmits the message to the neighbor node. The at least one node may also update the message with a lower probability of the calculated probability and a probability contained in the message, and transmit the updated message to the neighbor node. The node may also determine as a route a path along which a message is transmitted from the message containing the highest probability among probabilities contained in messages that are received.

Ad-hoc network for routing in consideration of mobility and routing method thereof

Embodiments of the present invention provide a method for tracking link mobility between two mobile nodes. Each node estimates a link mobility state of a link between itself and each of its neighbor nodes, accumulates successively the link mobility states, estimates link mobility parameters using the successively estimated link mobility states, and predicts a link availability probability using the link mobility parameters. The link mobility tracking can be applied to various routing protocols so as to implement mobility aware routing which enhance the routing performance.

Link mobility tracking and its application to mobile ad hoc networks

A frequency agile radio configured to determine an estimated coverage area of a primary transmitter is disclosed. The radio includes at least one position device configured to determine a position coordinate of the radio and generate a corresponding position signal. The radio also includes at least one frequency agile receiver configured to measure a power of a transmission at least one frequency and generate a corresponding signal. Additionally, the radio includes at least one controller in communication with the at least one position device and the at least one frequency agile receiver. The controller is configured to determine a plurality of position coordinates of the radio and a plurality of signal power datums. The controller is also configured to estimate the coverage area of the at least one primary transmitter, based on the determined plurality of position coordinates and the determined plurality of signal power datums.

Wireless communications using frequency agile radio

Disclosed is a cellular network handoff decision mechanism which comprising the steps of: determining a sampling interval using a carrier wavelength; determining a local averaging interval that is larger than the sampling interval; determining a handoff decision interval that is larger than the local averaging interval; selecting at least two base stations from a multitude of base stations having a pilot signal from a reference cellular network using a selection criterion; determining a received signal strength from the pilot signal strength for each of the selected base stations once during every sampling interval; calculating a local average signal strength value using each of the received signal strengths once during every local averaging interval; determining an assignment region in which the local average signal strength value lies using a hysteresis range; and calculating a handoff decision once during every handoff decision interval using a handoff calculation.

Cellular network handoff decision mechanism

Disclosed is a system for evaluating the performance of cellular network handoff decisions. One embodiment of this system includes the steps of: creating a reference cellular network description; creating reduced geometric structures from the reference cellular network description; representing a general trajectory for a mobile unit in the reference cellular network description; approximating the general trajectory with a piecewise path having a multitude of handoff decision points; selecting a handoff mechanism; selecting handoff parameters; creating a discrete-time formulation characterizing handoff behaviors; and calculating at least one handoff performance metric. The handoff performance metrics may include assignment probabilities; handoff probabilities; a mean number of handoff value; a crossover point; and overall signaling load incurred by a handoff mechanism.

Growing community of inventors

Fairfax Station, VA, United States of America

Brian L Mark