Bbnt Solutions Llc.

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Bbn Technologies Corporation

John R Zavgren

Joseph Jacob Weinstein

William Scott Passman

Brig Barnum Elliott

Keith William Manning

Joanna L Kulik

Norman Rehn

Susan L Wood

In an apparatus for varying the rate at which the broadcast beacons are transmitted, there is at least one router (). The router transmits beacons which contain various types of data, controls the rate at which the beacons are transmitted, and adaptively varies the rate at which the beacons are transmitted, in response to a variety of network conditions.

Method and apparatus for varying the rate at which broadcast beacons are transmitted

In a radio network having plural routers (), each router includes a routing table (). Link state information of the network that has been forwarded to the router is received and used to determine the connections in the network. The determined network connections are collected to generate network topology information which is placed in the routing table (). The network topology information is retrievable for inclusion in messages forwarded by the receiving router.

Radio network routing apparatus

A communications system has stations arranged in clusters (and) of communication member stations (CM, CM, CMand CM), with one member station (CH, CHor CH) in each cluster being a head station for the cluster. Each member station (CM, CM, CMand CM) communicates with the network through a cluster head station (CH, CHor CH). The cluster head stations (CH, CHand CH) communicate among other cluster head stations (CH, CHand CH). A mobile communications station (e.g., CM) evaluates a beacon message received from a first member station (e.g., CM) of the plurality of mobile stations through a transceiver. The station CMalso determines whether to communicate with the first member station CMdirectly or to communicate with the first member station CMby forwarding messages through a cluster head station CHthat is affiliated to the mobile communications station CM

Using direct cluster member to cluster member links to improve performance in mobile communication systems

A network for routing packets includes multiple nodes. A first node has a direct link to a second node. The first node receives a packet and identifies a primary next hop to which to transmit the packet ( ). The primary next hop identifies at least the second node. The first node transmits the packet to the second node ( ), determines whether the transmission was successful ( ), and identifies at least a third node when the transmission to the second node was unsuccessful. The first node identifies the third node by: finding a node in the network that has a direct link to both the first and second nodes ( ); identifying at least one alternate next hop, assuming that the link between the first and second nodes is unavailable, determining the cost associated with each of the alternate next hops, and selecting one of the alternate next hops based on the determined cost ( ); or retrieving a predetermined alternate next hop from a forwarding table stored by the first node ( ). The first node then transmits the packet to the third node for forwarding to the second node ( ).

System and methods routing packets on alterate paths

A communications system for communication among plural stations in a network has stations (CH CM CM CH CH CM CM ) arranged in clusters ( ) of communication member stations, each communicating with each other. One of the member stations (CH CH CH ) is a head station of the cluster. The cluster head stations (CH CH CH ) communicate with other cluster head stations (CH CH CH ). A method for configuring the network of stations includes a step of operating at least a first (CH ) and a second (CH ) station of the plural stations as cluster head stations, the first (CH ) and second (CH ) stations forming a communications link. The method also includes a step to resign the first (CH ) station from operating as a cluster head station when a predetermined resignation condition is met. The method also includes a step of maintaining the communication link between the first (CH ) and second (CH ) station as the first station (CH ) transitions from operating as a cluster head station (CH ) to operating as a cluster member station (CM ) of a cluster headed by the second cluster head station (CH ).

Cluster head resignation to improve routing in mobile communication systems

A communications system for communication among plural stations in a network has stations (CH , CM , CM , CH , CH , CM , CM ) arranged in clusters ( ) of communication member stations, each communicating with each other. One of the member stations (CH , CH , CH ) is a head station of the cluster. The cluster head stations (CH , CH , CH ) communicate with other cluster head stations (CH , CH , CH ). A method for configuring the network of stations includes a step of operating at least a first (CH ) and a second (CH ) station of the plural stations as cluster head stations, the first (CH ) and second (CH ) stations forming a communications link. The method also includes a step to resign the first (CH ) station from operating as a cluster head station when a predetermined resignation condition is met. The method also includes a step of maintaining the communication link between the first (CH ) and second (CH ) station as the first station (CH ) transitions from operating as a cluster head station (CH ) to operating as a cluster member station (CM ) of a cluster headed by the second cluster head station (CH ).

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Acton, MA, United States of America

John R Zavgren