Abstract: A system and method for controlling the dissemination of Routing packets, and decreasing the latency in finding routes between nodes. The system and method provides message exchanges between wireless devices to determine optimized communication routes with a minimum of overhead messages and buffered data. Exchanged messages are reduced to a specific series of exchanges indicating destination, destination node detection, and route, preferably using a series of IAP devices. Routes are discovered in an efficient manner and latency in finding routes between nodes is reduced, thereby reducing buffered information levels at individual devices.

Abstract: A method and apparatus for frequency correction of a signal in a wireless local area network (WLAN) communication system is disclosed. The signal is processed to determine a frequency offset estimate which is a frequency deviation of the signal from a local oscillator. The signal is then shifted by an amount corresponding to a frequency correction estimate where the frequency correction estimate is an averaged value of the frequency offset estimate and at least one prior frequency offset estimate. Finally, the frequency correction estimate is utilized to correct signals in the WLAN communication system.

Abstract: A method and apparatus for facilitating handoff for a mobile entity in a wireless communication network is provided (100). The method comprising obtaining a first internet protocol (IP) address for the mobile entity (105) when the mobile entity is attached to a first access node, identifying at least one target access node (110), the target access node being a potential access node for handoff for the mobile entity, sending a trigger message corresponding to the mobile entity to the identified target access node (115) and acquiring a second IP addresses for the mobile entity at the target access node (120). The invention also proposes a method for creating a tunnel for facilitating the handoff for a mobile entity from the first access node to the target access node (205, 210, 215, 220).

Abstract: A method for measuring the Time Of Arrival of signals in a communications network is provided. A transmitter emits a beacon that is a digital message of known content, followed by timing information. The message is preceded by a pseudo-random binary phase-shift keying (BPSK) modulated sequence that allows the receiver to synchronize on the received signal using the autocorrelation method. During the synchronization process, are computed the approximated Time Of Arrival (TOA) and approximated frequency difference between the local oscillator and the received signal. The content of the beacon message is then used for correcting the approximated TOA and the frequency differences, providing results of very high precision of TOA. The timing information that follows the beacon is used for network clock synchronization and for computing the distances between network nodes.

Abstract: A system and method for providing the ability to selectively share data in a network routing device with an associated host. The system and method employs a hardware firewall in the routing device which restricts the host such that it can only access areas in shared memory which contains data destined for the host. The routing device CPU notifies the host of pending data and the location of that data in the shared memory. The hardware firewall is also notified of the location in shared memory which the host may access. When the host attempts to read the data, the firewall ensures that only the stated memory area or areas are accessed by the host. Once the data has been read by the host, the firewall is notified to cancel the host's ability to access the shared memory until such time as a new packet destined for the host arrives in the routing device.

Abstract: One or more special merge vertices (1, 8) each of which is a root of two braches each including a monotonic (in respect to a particular coordinate) series of vertices are selected from an ordered arrangement of vertices (1-10) that defines a polygon (102). The special merge vertices (1, 8) can be sorted (according to the particular coordinate) so that they can be efficiently located when scanning through the polygon. In scanning through the polygon (102) in a process of rendering the polygon (102), the branches are used to demarcate boundaries of the polygon (102).

Abstract: A system and method for calculating an optimal route at a node by making use of routing metrics which if carefully chosen, can provide stability to the network and also provide features like Self Healing and Load Balancing. A Routing metric is calculated as a scalar number based upon a number of factors, such as number of hops, data rate, link quality and device type. Each factor can be determined by evaluation of Hello messages, or other routing messages as required.

Abstract: A system and method for achieving enhanced CSMA/CA which improves channel availability and quality of service (QoS) in a wireless communications network. The system and method establish channels to enable communication between nodes in a communication network, based on the relationship between the average time length of message data packets and the time lengths of the request to send and clear to send messages. A node of the communication network places a data packet at a location in a queue for retransmission based on a type of information contained in the data packet if the destination node for which the data packet is intended is unable to receive the data packet. The location in the queue is indicative of a duration of time that the node will delay before attempting to resend the data packet to the destination node.

Abstract: A system and method for enabling an ad-hoc communication network to maintain connectivity with the mobile nodes in the network in an effective and efficient manner with minimal overhead. The system and method enables an ad-hoc communication network to maintain connectivity between intelligent access points of the network and mobile nodes in the network while performing an on-demand protocol. The system and method further uses an improved distance vector routing algorithm and unicast messages, to thus avoid an increase routing advertisement frequency in the network while keeping network overhead at a minimum. The system and method also modifies the Ad Hoc On-Demand Distance Vector Routing (AODV) protocol to facilitate smooth handoff of subscriber devices in an ad-hoc communication network while also eliminating unidirectional links between nodes in the network.

Abstract: An ad-hoc, peer-to-peer radio system includes a series of radio terminals forming a service group, each radio terminal having a transceiver for communicating with terminals in the same service group, computer means, and memory for storing program software. Within the system, a method and protocol for communication among the terminals includes establishing a connection with one radio terminal based on time-division access; initiating an outgoing call from the radio terminal including registering with another radio terminal for serving as a node in the call connection by transmitting a registration request; and initially transmitting said registration request on a last time slot (TS) of a respective time frame (TF), said last time slot serving as a configuration channel.

Abstract: A method and system for routing data in a wireless network (400) that enables all nodes (106, 402, 404, 406, 408) to find routes to each other even if the nodes are incapable of operating as a router to route packets received from other nodes (106, 402, 404, 406, 408). The meshed nodes (106, 402) which are capable of performing packet routing act as proxy nodes for their associated non-meshed nodes (STA 13-STA 15) to route packets from their associated non-meshed nodes (STA 13-STA 15) to destination nodes. Some of the meshed nodes further operate as intelligent access points (106) to provide the non-meshed nodes and other meshed nodes with access to other networks, such as the Internet (402).

Abstract: A technique is used for providing additional information about a broadcast presentation that allows a user interested in the additional information to acquire it easily, using a selective call device or a television remote control device to easily acquire an information address during the broadcast when a prompt is presented during the broadcast. An advertiser can send the additional information over a wide area radio selective call communication system or can post it at a universal resource locator of a computer network. The information address is used to acquire the additional information. The information address can be stored, selected and deleted in the selective call device or remote control device. The prompt can be disabled or enabled manually or based on location.

Abstract: A system and method for enabling a node, such as a mobile user terminal in a wireless communications network, such as an ad-hoc network, to effectively and efficiently determine a clock correction factor for its local clock relative to a local clock of at least one other node. The node calculates a difference between the timing of the local clock of the node and the local clock of the other node based on the timing of signals transmitted between the node and the other node, and information pertaining to the transmission and reception of these signals by the node and the other node as indicated by the respective local clocks of the node and the other node.

Abstract: A system and method to provide emergency call access in Voice over Internet Protocol (VoIP) systems without compromising network security. The system and method enables VoIP emergency signal detection at a user device, and transmission of the VoIP emergency signal from the user node to a network server node through the use of data encapsulation and decapsulation (or “tunneling”), allowing VoIP data routing via an IP transport layer regardless of access or network security restrictions.

Abstract: A system and method for message exchanges in a wireless communication network which minimize network overhead and offers fast determination of Coordinates of a device. A system and method controls a node to exchange small, structured messages with one or more reference nodes requesting the Coordinates of the reference node, which are then used in a periodic evaluation of time of flight messages from that reference node for determination of Coordinates of the node.

Abstract: A novel protocol for an ad-hoc, peer-to-peer radio network that provides collision-free channel access with an emphasis on improving geographic reuse of the frequency spectrum. The protocol of the invention is executed on the reservation or control channel, and provides a method for allocating data transactions on the data channels. The system of the invention utilizes multiple parallel data channels that are coordinated by a single reservation channel. The transceiver of the system employs two modems to solve the channel reliability issues with multiple channel designs, where one is dedicated as a receive-only modem for gathering channel usage information on the reservation channel. High quality voice, video and data may be transmitted. The reservation channel implements a time division multiple access algorithm with dynamic slot allocation. In a distributed manner, nodes determine geographic reuse of slots based on channel quality extracted from the modem.

Abstract: A system and method for improving the ability of a wireless communications network, such as a packet-switched data communications network, to provide service to mobile user terminals. The system and method employs a mobile access point, adapted for use with the packet-switched communications network comprising at least one fixed access point, to provide a mobile wireless user terminal with access to the network, and a method for using the same. The mobile access point comprises at least one transceiver, which can be mounted to a mobile vehicle and receive substantially constant power from the vehicle, and which is adapted to transmit and receive communications signals to and from the wireless user terminal, and to operate as a communications link between the wireless user terminal and the fixed access point, to provide the wireless user terminal with access to the network via the communications link.

Abstract: A system and method for providing a network of wireless devices including Mobile Terminals, Wireless Routers and a Local Control within a high rise building or other three dimensional deployment structure, such that communication, identification and position calculations can be achieved regardless of environment nature. Mobile Terminals are deployed to assume any random positions within a three dimensional deployment structure. Communication and position calculations are provided at each level, or floor of the building, by Horizontal and Vertical Routers, where Vertical Routers are further used to successfully communicate between levels, or floors. The Vertical Routers provide communication links with the Local Controller via one or more Intelligent Access Points. The infrastructure of Vertical and Horizontal routers, the Intelligent Access Points and the Local Control are elements of an infrastructure deployed before a fire incident or other emergency happens.

Abstract: A system and method for identifying potential hidden node problems in a multi-hop wireless ad-hoc communication network, such as an 802.11 network. The system and method evaluates the relationship between the neighbors of each respective node to identify nodes of a wireless ad-hoc communication network whose capabilities of receiving data packets can be adversely affected by hidden node problems in order to avoid selecting paths containing those potentially problem nodes for routing data packets. Specifically, for each node, the system and method generates a node metric identifying the relationship between the neighbors of a node. Each node can then transmit its respective metric with its routing advertisement data, so that other nodes can assess the degree of potential hidden node problem that may be experienced by that node, and can choose to avoid using that potentially problem node for routing data packets to other nodes.

Abstract: A wireless communication device (100) comprises an antenna (204) comprising a major radiating element (210) that includes a letter C shaped part (212) connected to a letter U shaped part (214). The major radiating element (210) is spaced from a ground plane (302) and one or more components (206, 208) having conductive parts are located between the major radiating element (210) and the ground plane (302). Openings (314, 316) in the ground plane (302) are located under the components (206, 208) or terminals (310) of the components (206, 208). Passive radiators (126, 700) having multiple sections (602, 604, 702, 704, 706) of different transverse dimension are located on a flip (110) of the wireless communication device (100) proximate the antenna (204).