870 results about "Relay network" patented technology

A method and system for establishing a Virtual Path (VP12) capability in a Frame Relay network wherein frames are transmitted over a plurality of virtual circuits from a first switching node to a second switching node. A control message is transmitter from the first switching node to the second switching node with a Data Link Connection Identifier (DLCI) having a predetermined value indicating the purpose of the control message which is to define a virtual path aggregating at least two virtual circuits selected from multiple virtual circuits. The control message contains the identification of the virtual circuits aggregated in the defined virtual path.

An apparatus for optimizing communications between session border controllers in a network environment is provided that includes a session border controller (SBC) operable to communicate with a first endpoint and a second endpoint. The SBC is also operable to communicate with a data path border element (DBE) and a signaling path border element (SBE). The DBE is operable to provide a media relay for a communication session involving the endpoints, the media relay being invoked by either of the endpoints using a traversal using relay network address translation (TURN) protocol, which allows the SBC to operate in either of two modes depending on protocol support present in the endpoints.

The embodiments balance wireless communication bandwidth capacity in a channel one or more cascading wireless communication links in a wireless communication cell, and manage the wireless communication bandwidth capacity in the channel across two or more virtual cells within the wireless communication cell.

A method communicates packets in a relay network. The packets are communicated from a set of mobile stations to a relay station using a set of connections, there being one connection between each mobile station and the relay station. The packets are communicated between the relay station and a base station using a relay tunnel connection, between the relay station and its adjacent relay station the packets are communicated using the relay tunnel connection.

An approach provides interdomain traversal to support packetized voice transmissions. A signaling message is received for establishing a voice call from a first endpoint associated with a first domain to a second endpoint associated with a second domain. The first endpoint queries a STUN (Simple Traversal of UDP (User Datagram Protocol)) server to determine information relating to a firewall and network address translator that the first endpoint is behind, and to log into a TURN (Traversal Using Relay NAT (Network Address Translation)) server configured to establish a media path between the first endpoint and the second endpoint. A first proxy server serving the first endpoint communicates with an ENUM (Electronic Number) server to convert a directory number corresponding to the second endpoint to a network address. The first proxy server communicates with a second proxy server serving the second endpoint to establish the voice call. The STUN server, the TURN server and the ENUM server are maintained by service provider. The first endpoint is authenticated to permit exchange of a media stream over the media path. The media stream is relayed, if the first endpoint is successfully authenticated.

A system and method for communicating information in a wireless cooperative relay network of nodes, the nodes including a source, a set of relays, and a destination. The source broadcasts a code word encoded as a data stream using a rateless code. The relays receive the data stream, decode the data stream to recover the code word, and reencode and transmit the recovered code word as the data stream with the rateless code. The destination receives and decodes the reencoded data streams to recover the code word.

A method and apparatus is disclosed herein for performing multi casting. In one embodiment, the method comprises receiving routing, association, relaying, and/or topology information associated with a plurality of nodes in a multi-hop wireless network, the plurality of nodes communicably coupled in a tree or mesh arrangement via a plurality of broadcast channels; and determining a subset of the plurality of nodes over each broadcast channel on the multi-hop wireless network that is responsible for sending acknowledgment information, in response to receipt or lack of receipt of transmissions, back to senders of transmissions.

The invention aims to provide a wireless multi-hop ad hoc network communication method, which comprises the steps of network establishment and maintenance, and service transmission. The network establishment and maintenance comprises the following steps of: finding of neighbors; adding and deletion mechanisms of the neighbors; and establishment and maintenance of a route, in which the interaction of neighbor information among network nodes ensures that each network node finally possesses a topology table of whole network connection relationship, then a main operation node of the network nodes is used to calculate the route of the whole network according to the topology table and notifies other network nodes in the network of routing information in an information interaction mode at the same time, and the topology table and a routing list respectively saved by each network node are kept consistent to finish the establish of the network when the network is finally steady. The service transmission comprises the following steps of: search of an access point, link application, link establishment, service transmission and link demolition. A self-developed wireless multi-hop ad hoc relay network of the invention can finish the communication in tunnels or on occasions with similar characteristics.

A method, system and network transmit data from a base station, via relay stations, to user stations. Imperfect channel state information (CSI) for downlink channels from the base station and the relay stations to the user stations is acquired. For each candidate transmission strategy of a set of candidate transmission strategies, a corresponding beamforming matrix is determined according the imperfect CSI. For each beamforming matrix, a bound on an expected target benefit function is determined, and a particular one of the bounds is selected. The data are then transmitted from the base station, via the relay stations, to the user stations according to the beamforming matrix associated and the candidate strategy associated with the selected bound.

A method selects an optimal route in a cooperative relay network including a set of nodes. For each node in a set of nodes of a cooperative relay network, dynamically varying channel state information is determined. A transmission policy based on the dynamically-varying channel state information is selected, in which the transmission policy includes selected nodes forming an optimal route, a transmission mode for each selected node, and a transmission power for each selected node.

This invention relates to a Li ionic power storage battery balance circuit. Every battery module has a set of balance circuit, at least two units of battery modules are serial, positive and negative ends of the battery module V are connected with a relay, serially connected with a self-restoring fuse and connected and a constant current DCDC converter with a discharge resistor switches separately. In the entire battery set by two conversions, the battery is charged or discharged according to the target balance voltage, balanced maximum volume difference or the maximum voltage difference designed by the module, the relay network switches the charge or discharge of the resistor of the constant current DCDC converter.

Methods and Systems are provided for bridging heterogeneous media packets using a single processor resource having a virtual bridge. Network interfaces associated with heterogeneous media channels relay network packets to the virtual bridge. The virtual bridge accesses metadata associated with the relayed network packets and translates the network packets to between media formats. The translated network packets are then relayed to an appropriate network interface. In one embodiment, the virtual bridge is dynamically configurable within the processing resource.

A route is selected in a wireless cooperative relay network of nodes. A decoding order is initialized. A set of resources is minimized subject to constraints. The resources are allocated to the nodes in the decoding order. The decoding order is changed iteratively to further minimize the allocated resources, until a minimum is reached. A code word is transmitted when the allocated resources are at the minimum, which can either be determined globally or locally at each node. The method can operate in a centralized or distributed manner.

The invention provides a data structure embodied in a computer readable media. The data structure is a protocol data packet (PDU) communicated in a mobile multihop network between stations. The data structure includes a relay media access header, a payload and an optional cyclical redundancy checksum for the protocol data unit; and an indication whether the PDU is a relay media access protocol data unit or not.

A method and system locates a position of a transceiver in a cooperative relay network of nodes. A primary node broadcasts a range request (RREQ) message. A target node, in response to receiving the RREQ message, broadcasts a range reply (RREP) message, wherein the RREP message includes a time difference between receiving the RREQ message and broadcasting the RREP message. A secondary node, in response to receiving the RREQ message and the RREP message, broadcasts a range data (RDAT) message, wherein the RDAT message includes a time difference between receiving the RREQ message and the RREP message. Then, a position solver can determine a location of the target node based on the time differences in the RREP message and the RDAT message.

The present invention relates to a method, a system and an apparatus for implementing bandwidth allocation and scheduling management based on a relay station. A mapping information unit for controlling a RS (MAP_RS) is set in a frame structure of the physical layer of a BS and an extended frame structure of the physical layer of a BS is constructed in a frame structure of the BS physical layer. The BS constructs a mapping information message MAP_RS for controlling the relay station RS base on the extended frame structure of the BS physical layer, and performs bandwidth allocation and scheduling management of a communication channel of the RS by the RS according to the MAP_RS message. Through the present invention, a bandwidth allocation is implemented mainly at the BS, and a service scheduling is implemented mainly at the BS. The RS only performs an uplink or downlink scheduling of the RS passively. The complexity of the RS reduced effectively. The Multi-hop relay problem is solved using a bandwidth request relay and a bandwidth allocation relay, without introducing any complex technologies and procedures of the bandwidth request, the bandwidth allocation and the scheduling management. The complexity of the BWA relay network is simplified.

Cached or predictive negotiation of compression parameters over a modem relay network connection involves method and apparatus for determining at a gateway the identity of a client/server modem that is called or calling, and using a profile of such called or calling client/server modem, the profile being stored at the gateway or an affiliated agent, to transmit respectively a candidate response or command containing compression parameters. Preferably, a candidate response or command includes an exchange identification (XID) or link request (LR) command or response, either provisioned, i.e. manually configured or automated, i.e. computer-generated. The profile is stored in a memory. The actual achieved parameters for a given call also may be stored, e.g dynamic learning may be had. Finally, establishing such profiles by placing dummy calls once the modem's phone number is known also is described as a feature of the invention.

The present invention provides an enhanced H-ARQ scheme that optimizes bandwidth utilization and spectrum efficiency. When an H-ARQ attempt is unsuccessful due to loss or error over a hop between the BS and MS/SS, then only the first node in the hop chain that fails to decode the packet transmits another H-ARQ attempt. The BS determines the first node that fails on decoding based on certain information such as the feedback information sent from the nodes on the path. The previous node of the failed node is then instructed to retransmit by the BS.

An apparatus for estimating a wireless radio channel between a first terminal and a relay station, the apparatus including a receiver for receiving a signal including a superposition of previously transmitted first information from the first terminal and second information from a second terminal, the second terminal also communicating with the relay station, a storage for storing the previously transmitted first information, and a channel calculator for calculating the wireless radio channel using the received signal and the stored first information as pilot information for the received signal.

In a sensor network system, a communications network connects a set of sensors to a server collectively managing the set of sensors. First, the sensor-managing server acquires remaining drive times of batteries in the sensors, and specifies a target remaining drive time. The server then controls the operation of the sensors so that the remaining drive times of the batteries in the sensors are substantially equal to the target remaining drive time. This reduces the maintenance workload for a system manager, especially, in the recharging of the sensor batteries.

A method and apparatus for multicast communications in a multi-hop relay network are described including sending an extended request message, wherein the request message includes a multicast connection identification, multicast distribution tree information and a path identification and receiving an extended response message. Correspondingly, a method and apparatus for multicast communications in a multi-hop relay network are described including receiving an extended request message, wherein said request message includes a multicast connection identification, multicast distribution tree information and a path identification and sending an extended response message.