Koninklijke Philips Corporation N.V.

U.S. Philips Corporation

Nxp B.v.

Philips Lighting Holding B.v.

Philips Intellectual Property & Standards Gmbh

Partners for Corporate Research International

Klaus Peter May

Jörg Habetha

Guido Roland Hiertz

Olaf Wischhusen

Christoph Herrmann

Yonggang Du

Francesc Dalmases

Begonya Otal

Peter Fuhrmann

Joachim Kahlert

Joerg Habetha

Manfred Bruno Zinke

Jörn Ungermann

Joachim J Noll

Georgios Orfanos

Rajesh Shantaram Bagul

Jörg Peetz

Yusuf Efe

Manfred Zinke

A method of decentralized medium access control in a communications network consisting of a plurality of stations, wherein a sending station transmits a reservation request for a future transmission to an intended receiving station, said intended receiving station being in a reception range of said sending station, said reservation request signalling reservation information including starting point and duration of the transmission, defining a time period of said future transmission, and, in case of a multi-channel system, frequency or code of the channel of said future transmission, so establishing a reservation, and stations active in said reception range overhear said reservation request and other stations than said intended receiving station perform the actions of storing said reservation information locally and defer from medium access during the time period and on the channel of the future transmission.

Method of decentralized medium access control in a communications network

In an Access Point controlled wireless network, wherein one channel communication is ruled by an identifier associated with the Access Point, a method for direct communication between a first station and a second station, includes generating a second identifier by the first station, different from the identifier associated with the Access Point, and optionally choosing a different channel; sending, by the first station, an invitation message for direct communication carrying the second identifier and optionally the second channel to the second station; sending, by the second station, a response message acknowledging the invitation message; setting up direct communication between the first station and the second station using the second identifier and optionally the second channel.

Method for derect communication between a first station and a second station of a wireless network

The present invention relates to the connection of subnets which operate on different frequency channels and are connected by wireless forwarder stations. According to the present invention, a forwarding station periodically switches to the other frequency channel to remain there for a pre-defined presence duration, whereby jitters of the presence time caused by overlapping packet transmissions are compensated. According to the present invention, a presence and absence time of the forwarder station in the respective subnet is indicated by using signals relating to a power saving mechanism.

Network with subnets being connectable via bridge terminals

A fast method for allocating those channels or subcarriers of a multicarrier network to an ahead lying transmission is to let a transmitting terminal and a receiving terminal which intend to access the medium determine the status of the channels or subcarriers that are within their reception range and send a signal indicating the determined status to the corresponding terminal which will select those channels or subcarriers for the eventual transmission which fit best. Other terminals within the transmission range of the transmitting or the receiving terminal respect the reservation and wait for the current transmission to find out which channels or subcarriers are actually used.

Method for signaling the status of a subcarrier in a MC network and a method for adaptively allocating the subcarriers in a MC network

Method for reservation of a medium in a radio communication network for data transmission between stations (A-E) of the network comprising at least one station (A, B, E) operating according to a first protocol (DRP) and a second station (C, D) operating according to a second protocol (802.11), the method comprises the steps of: providing a contention free period () within the first and second protocol; performing the reservation of the medium for the first station (A, B, E) according to the first protocol; and performing the reservation of the medium for the second station (C, D) according to the second protocol, announcing the contention free period for the first and second protocol by use of the same signal (). In particular a beacon signal is used, wherein the beacon includes a signal () which is recognized and accepted by the second stations (C, D). Further information () is added into the beacon frame () for reserving reservation periods () for the first stations (A, B, E).

Method of distributive reservation of a medium in a radio communications network

A method of providing a medium access control protocol using a listen before-talk scheme within a wireless network having a plurality of stations communicating over a channel, wherein a valid route from a source station to a destination station via at least one more station is determined, said method comprising: transmitting a data packet over said channel by a first station; receiving said data packet in a second station; analyzing data in said data packet by said second station whether said data packet is to be forwarded further; and if said data packet is to be forwarded further, prioritizing transmission of said data packet on said valid route.

Method of providing a medium access protocol

Receiver for receiving a data stream via a data bus, which receiver samples the bits of the data stream in an over-sampling process, in which n bit strobe offsets are used and n data sets with i bits are sampled,&#x2014;applies a decision criterion for identifying those data sets with correct bit values. This decision uses checksum CRC,&#x2014;selects one of the identified data sets with correct bit values and&#x2014;uses the bit strobe offset, which was used for receiving the selected data streams, for receiving the data stream. In this way the multiphase clock with optimal phase shifts is selected.

Receiver with adaptive strobe offset adjustment

The invention relates to a local area network including at least one bridge terminal, which bridge terminal is provided for transmitting data between the terminals of at least two sub-networks via a wireless medium. The bridge terminal is alternately connected to the sub-networks for exchanging data. For buffering received data for an unconnected sub-network, the bridge terminal includes an intermediate store.

Local area network with a bridge terminal for transmitting data between a plurality of sub-networks

A bridge terminal of a local area network is provided for transmitting data between the terminals of at least two sub-networks via a wireless medium. The bridge terminal is alternately connected to the sub-networks for exchanging data. For buffering received data for an unconnected sub-network, the bridge terminal includes an intermediate store.

A local area network with a plurality of nodes for transmitting cells in the asynchronous transfer mode over a ring system having two opposite direction rings. In the event of a defect in a transmitting line from a node, or a defect in a neighboring node, a loop is formed in this node to reroute messages from one ring to the other. First, a node detecting a defect transmits a message of a first type to all other involved nodes, identifying the location of the detected defect. This information is entered in a respective status table in each node. After evaluating the information in its status table, a node which should form a loop does so, and sends a message of a second type identifying the loop to any nodes which do not already have this information.

Local area network for reconfiguration in the event of line ruptures or node failure

The invention relates to a multilayer printed circuit board, in particular, for high-frequency operation, having least an outer, plane dielectric layer for accommodating interconnection paths of equal cross-section and component as well as further alternately provided metallic and dielectric layers for forming a reference earth and for the voltage supply to said interconnection paths and components via plated-through holes. In order to obtain a plane surface for the interconnection paths and predetermined areas on the printed circuit board, which areas have different characteristic impedances when interconnection paths having the same cross-section are used, at least the first metal layer comprises at least one window and the subsequent metal layer has a metal island corresponding to the area of the window, which island is connected to the reference earth via a buried plated-through hole, and the characteristic impedance of the interconnection paths is a function of the resulting thickness of the effective dielectric layers the number of which is increased in the area of the window.

Growing community of inventors

Aachen, Germany

Klaus Peter May