Samsung Electronics Co., Ltd.

George Mason Intellectual Properties, Inc.

Icu Research Industrial Cooperation Group

University of Texas System

Yong-Sung Roh

Young-Gon Choi

Jung-ho Kim

Jae-Hoon Kim

Shubhranshu Singh

Kyung-lim Kang

Ji-Hoon Lee

Chang-seok Oh

Hyun-Cheol Park

Sung-Won Lee

Sung-Hee Lee

Brian L Mark

Joong-soo Ma

Nam-shik Kim

Young-Sang Kim

Dong-Keun Lee

Jae-hoon Kim

Jeong-sik In

Chul-Hee Kang

Joo-Sang Yoon

Ari Arapostathis

Hyun-sik Kang

Hae-lyong Kim

Singh Shubhranshu

Young-bae Ko

Kee-cheon Kim

Vamit Suri

A channel scanning method and system at an MP within a mesh network associated with a local network are provided. A MAP sends a local management frame including information about a mesh network on an allocated local channel and sends a mesh management frame on a mesh channel indicated by the mesh network information. An MP scans a plurality of channels including the local channel and the mesh channel in an order of channels numbers, receives the local management frame by scanning the local channel, and receives the mesh management frame by scanning the mesh channel based on the mesh network information of the local management frame.

Method and system for channel scanning in a mesh network

In general, an Internet gateway assigns an address to a node of an ad-hoc network on receipt of request for an address assignment. However, a load exerted to the Internet gateway increases. Accordingly, one (proxy node) of the nodes of an ad-hoc network can serve as a proxy node to perform an address assignment function of the Internet gateway. That is, if a node of the ad-hoc node does not receive an advertisement message, it requests the Internet gateway for address assignment to perform the proxy node function. The node is assigned with at least two addresses from the Internet gateway, and then assigns the address to the requesting node. Accordingly, a load exerted to the Internet gateway can be reduced.

Method for address assignment in ad-hoc network

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

Provided are a network-coding apparatus and method which can increase a data communication capacity in a communication environment to which an error-correction code (ECC) is applied. The network-coding apparatus includes a received signal processing unit receiving at least two signals, and decoding the at least two received signals; and a transmission signal processing unit receiving the at least two decoded signals from the received signal processing unit, merging the at least two decoded signals, and generating a merged transmission signal.

Apparatus and method for network-coding

A method and system for establishing multiple channels between nodes each having a single radio interface in a mesh network supporting multiple channels are provided. Each node in the mesh network initially generates a neighbor node table, taking into account at least one traffic channel temporarily established for data transmission to a neighbor node. The neighbor node table is updated when a traffic channel is established for data transmission to the neighbor node, and the neighbor node table is updated according to channel use information of the neighbor node received from the neighbor node or channel use information of a node two hops away.

Method and system for allocating multiple channels in a mesh network

Provided is a fine frequency synchronization method of a WiBro system, and particularly, a fine frequency synchronization method which measures a spread degree of a received signal of an adjacent subcarrier using orthogonality of PN sequences and thereby estimates a frequency offset, in a base station or a wireless repeater without using a GPS receiver. The fine frequency synchronization method includes: (a) performing despreading on received adjacent subcarrier sequences, using a PN sequence transmitted from a transmitting party; (b) obtaining ratios of correlative values obtained by the despreading; and (c) estimating a frequency offset on the basis of the ratio of correlative values. Accordingly, fine frequency offset estimation with relatively low complexity is possible without using a GPS receiver in a WiBro environment where interference signals of other base stations or repeaters exist.

Method and apparatus for fine frequency synchronization in wireless broadband (WiBro) system without using global positioning system (GPS) receiver

An ad-hoc network for routing extension by supporting the IPv6 protocol and a method for routing extension. The ad-hoc network comprises a gateway for appending an address configuration message to an ad-hoc Routing REPly (RREP) message and transmitting an extended ad-hoc RREP message; and a node for separating the address configuration message from the received extended ad-hoc RREP message, establishing a packet transmission path using the ad-hoc RREP message, and configuring a global address using the separated address configuration message. Accordingly, the present invention provides efficiency and improves the network scalability by utilizing the existing IPv6 protocol without amendments and reducing the size of the packet transmitted.

Ad-hoc network for routing extension to support internet protocol version 6(IPV6) and method thereof

A service provider discovery method in a wireless network environment, includes receiving, by the gateway, a service request (SREQ) packet which is broadcast from a first mobile node in the ad-hoc network; updating and transmitting, by the gateway, the SREQ packet to a service repository which stores at least one service provider information, in the infrastructure network; transmitting, by the service repository, a service reply (SREP) packet containing information relating to a service provider which provides a service requested by the SREQ packet to the gateway, and updating and transmitting, by the gateway, the SREP packet to the first mobile node. Accordingly, the service can be used in association with the ad-hoc network and the infrastructure network.

Gateway for interconnecting ad-hoc network and infrastructure network, and methods for discovering and registering service provider using gateway

An apparatus, method and system are provided for routing a broadcast data frame in a mesh network with multiple mesh portals. In the mesh network, every mesh point selects and registers its default mesh portal. A mesh portal enters its address in a destination address field of a broadcast data frame received from outside of the mesh network and broadcasts the data frame to inside of the mesh network. The mesh point processes a received broadcast data frame relating to its registered mesh portal, thereby preventing the broadcast data frame from being redundantly transmitted in the mesh network.

Apparatus, method and system for routing a broadcast data frame in a mesh network with multiple mesh portals

A method and apparatus for scheduling in a Wireless Local Area Network (WLAN) mesh communication system including a plurality of Mesh Access Points (MAPs) are provided, in which, when a message to be transmitted from a first MAP of the MAPs to MAPs adjacent to first MAP is generated, setting a first interval for transmitting the generated message during a predetermined period, and setting a remaining interval excluding the first interval during the predetermined period as a second interval for receiving messages from the adjacent MAPs.

Method and apparatus for scheduling in WLAN mesh communication system

A method for relaying packets through a relay node in a communication system composed of a source node, a destination node and at least one relay node for transferring the packets transmitted from the source node to the destination node. The relay node compares a potential corresponding to a number of hops and constituting the transferred packets with a stored potential from the destination node. If the stored potential is smaller than the potential constituting the packets, the relay node updates the packet and broadcasts the updated packets. Also, according to a method for setting a route for transmitting packets, packets are broadcast and it is checked whether updated packets obtained by updating the broadcast packets are received. If updated packets are received, an address of a packet transmission node constituting the updated packets is stored and the following packets are transmitted to the node having the stored address.

System and method of routing in a router in a communication system

A power-saving method of wireless communication device, which operates a sleep mode for minimizing power consumption except for an active mode for communication, initializes a sleep probability upon the device being turned on, operates the active mode for communication with starting an active mode timer, transits to the sleep mode when there is no packet to transmit or receive before the active mode timer expires; and determines an exit from the sleep mode on the basis of the sleep probability.

Power-saving method for wireless sensor network

A method, medium, and system for connecting to a communication system in a network having a plurality of nodes capable of communicating with each other. The node requests an identifier to a foreign network when a router advertise (RA) message is received from the foreign network, and then the node connects to the communication system, via the foreign network, by use of the received identifier. A method, medium, and system for delegating a network identifier (prefix) from a server of a foreign network, in a network having a plurality of nodes capable of communicating with each other, so that a node can communicate with the foreign network. The prefix to be used by the nodes in the network is transmitted from the server of the foreign network to the node.

Prefix delegation system and method of ad-hoc network

A wireless communication system capable of performing an optimized routing that includes a transmitting node transmitting a route request message including its own diameter option to all nodes existing in a communication area in a network, and a plurality of receiving nodes receiving the Route-Request message from the transmitting node, checking whether the receiving nodes themselves are terminal nodes located at terminals of a spanning tree to which the RREQ message is transmitted, and transmitting route reply messages including diameter reply options to the transmitting node when the receiving nodes themselves are the terminal nodes. The transmitting node measures a magnitude of the network based on the diameter reply options included in the Route receives messages. Accordingly, the respective node in the MANET measures the network range and actively use the measured information, and thus a routing optimized to the current circumstances of the network is performed.

Growing community of inventors

Icheon-si, South Korea

Yong-Sung Roh