Koninklijke Philips Corporation N.V.

Bernard Walke

Theodorus Jacobus Johannes Denteneer

Guido Roland Hiertz

Xiangyu Wang

Semih Serbetli

Sri Andari Husen

Gustaf Sebastian Max

Jelena Mirkovic

Michael Einhaus

Hans Juergen Reumerman

A transmitting and a receiving apparatus, a system and a method of performing multi-user transmission to other transmission ends include broadcasting a request for transmission to the other transmission ends. A request is provided with a Medium Access Control MAC frame which includes a list of at least two identifications of receiving ends which are requested to reply to the request.

Enhanced multi-user transmission

The present invention relates to a method of generating a message by a station in a network in which stationstransmit by intervals (A) for reporting to other stations (B) of reservations of a medium in an interval, wherein the station: &#x2014;generates a set () of reservation information elements (A.-A.n) wherein each reservation information element (A.-A.n) identifies one of said reservations in the interval; and &#x2014;creates at least one message (-) containing reservation information elements (A.-A.n); &#x2014;transmits the message to other stations (B).

Method of generating report messages in a network

A method of allocating frequency channels in a wireless communication system comprising common channel framework enabled stations, said method comprising: &#x2014;using by said common channel framework enabled stations a common frequency channel at common time intervals in order to determine a communication frequency channel on which a pair of common channel framework enabled stations will be allowed to exchange data frames, &#x2014;periodically changing the common frequency channel at the beginning of each common time interval.

Wireless communication system

A wireless network () comprises mesh devices and non-mesh devices. A medium access control architecture incorporates at least a point coordination function as an access method, wherein the point coordination function starts a contention-free period () with a beacon () so that a non-polled transmission by the non-mesh devices is prevented. Further, the mesh devices are enable to communicate during the contention-free period (). Hence, communication between the mesh devices is priorisized so that a high reliability is achieved and utilization of the wireless network () is optimized.

Wireless network with contention and contention-free periods

A method of congestion management in a wireless mesh network in which the CSMA/CA algorithm is used to access wireless medium, said network comprising a first station and at least one neighboring station able to communicate directly with the first station, comprises: &#x2014;broadcasting () an announcement message by the first station to the at least one neighboring station when the first station experiences a congestion in its environment, said announcement message comprising a congestion level parameter, &#x2014;activating () by the neighboring station, at reception of the announcement message, a congestion state in which the minimum size of the time window, called contention window, to access the medium before transmission of a message is strictly greater than the minimum size (CWmin) defined in absence of congestion, said minimum size in congestion state being defined as a function of the congestion level parameter.

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Wuerselen, Germany

Bernard Walke