Koninklijke Philips Corporation N.V.

Deutschetelekom Ag

Bernhard Walke

Guido Roland Hiertz

Theodorus Jacobus Johannes Denteneer

Norbert Esseling

Hans-Juergen Reumerman

Yunpeng Zang

Jelena Mirkovic

Theodorus J J Denteneer

Lothar Stibor

Georgios Orfanos

Stefan Mangold

Gustaf Sebastian Max

Hans-Jurgen Reumerman

Hong Ma

Harald Radke

Peter M Van De Ven

A method of reducing interference in a communication system supporting multiple radio channel communication scheme, where a communication link can be established between a transmitter and a receiver. The transmitter first determines interference level at the transmitter, and then based on the determined interference level, performs link adaptation. The link adaptation comprises applying channel bundling for adapting the communication link so as to transmit simultaneously on at least two radio channels from the transmitter to the receiver.

Link adaption by channel bundling in a wireless communication system

The present invention relates to an apparatus and method for connecting a mesh type network via an access device (C) to another network. A proxy mechanism is provided in the mesh type network, that allows for interconnection and range extension of legacy access point based mesh type networks.

Proxy mechanism for mesh-type networks

In a cellular wide-area radio communications system, comprising a plurality of base stations, a plurality of relay stations, and a plurality of mobile stations, wherein each of the relay stations is associated with at least one of the base stations, each of the mobile stations is associated with at least one of the base stations or one of the relay stations, wireless data transmissions between mobile stations and base stations take place either as single-hop data transmissions between the mobile stations and their associated base stations, or as multi-hop data transmissions between the mobile stations and their associated relay stations and a data transmission between the relay stations and the base stations associated with the relay stations, wherein an average number of multi-hop data transmissions in the radio communications system equals at least an average number of single-hop data transmissions.

Cellular wide-area radio communication system with relay-enhanced cells

The present invention relates to a method of reducing beacon collision probability in a communication network supporting control channels comprising beacon periods divided into beacon slots, each beacon period being followed by a contention period. In the method a communication device () operating in the communication network first chooses () an available beacon slot for transmission of a first type of beacon for exchanging network topology information with other communication devices operating in the communication network. Then the communication device transmits () a beacon of a second type comprising an identifier of the communication device and the chosen beacon slot for the transmission of the beacon of the first type, the beacon of the second type being transmitted in the contention period.

Reducing beacon collision probability

In wireless meshes, mesh points announce reservation of the wireless medium in beacon frame. Each mesh point determines scheduled reservation of the medium for transmission of the future beacon frames and scheduled reservations of the medium for data communication with the station The station further aggregates the reservations into a single element: an medium occupation element and integrates this element into the beacon frame for future transmission to nearby mesh points.

Medium reservation announcement

The present invention is directed to an apparatus and method for connecting a mesh type network via an access device to another network, wherein a proxy mechanism is provided in the mesh type network, that allows for interconnection and range extension of legacy access point based mesh type networks. Thereby, interconnection and range extension of e.g. legacy AP-based WLANs or similar types of networks can be achieved. Moreover, the proposed proxy mechanism does not require any changes or modifications to the access device(s) (e.g. AP) and works with any type of access device.

The present invention relates to a method for transmitting frames from a transmitting mesh device to a receiving mesh device in a mesh network, comprising: storing frames received in the transmitting mesh device from a source mesh device and intended for a destination mesh device in a relay queue, the source mesh device and the destination mesh device being different from the transmitting device, storing frames generated by the transmitting mesh device in a local queue, different from the relay queue, selecting a frame from the relay queue or local queue based on a predetermined scheduling strategy, &#x2014;transmitting the selected frame to the receiving mesh device.

Method of transmitting frames in a mesh network, mesh device and mesh network therefor

The present invention relates to, in a wireless network in which wireless stations transmit frames, a method of managing the access of the medium to a wireless station once a frame or a sequence of frames has been transmitted by the wireless station, the method comprising: (a) generating a time value resulting from a function of the duration of the frame or the sequence of frames to be transmitted, &#x2014;(b) transmitting the frame or the sequence of frames; and (c) after step (b), the wireless station refraining from access to the medium by counting down a refraining time, the value of the refraining time being determined by taking account of the said time value.

Management of access to a medium

In a cellular wide-area radio communications system, comprising a plurality of base stations; a plurality of relay stations; and a plurality of mobile stations; wherein each of the relay stations is associated with at least one of the base stations, each of the mobile stations is associated with at least one of the base stations or one of the relay stations, wireless data transmissions between mobile stations and base stations take place either as single-hop data transmissions between the mobile stations and their associated base stations, or as multi-hop data transmissions between the mobile stations and their associated relay stations and a data transmission between the relay stations and base stations associated with the relay stations, and wherein an average number of multi-hop data transmissions in the radio communications system equals at least an average number of single-hop data transmissions.

Cellular wide-area radio communications system with relay-enhanced cells

A congestion control method for a communication system supporting layered radio channel structure for communication between at least a first communication device and a second communication device that offers a first and second types of service with corresponding first and second priority orders. The messages between devices include a preamble and a payload with each message being separated by at least a minimum allowable period. The first communication device generates a physical layer message pertaining to the first type of service, senses the radio channel idle for at least a period corresponding to the minimum allowable period between two messages, and transmits the physical layer message including a preamble indicative of the type of service the message pertains. The content of the preamble is detected by the second communication device within a communication range irrespective of the decoding state of the payload of the transmitted message.

Congestion control in a communication network based on the CSMA/CA protocol

A wireless system and method of wireless communication are described.

MAC protocol for centrally controlled multichannel wireless local area networks

A method for the operation of wireless base stations for packet transfer radio systems having guaranteed service quality. The method includes increasing the supply ranges of packet oriented transferring radio stations, which are located outside the range of the central base stations and are supplied by wireless base stations (relay stations). In contrast to conventional wireless transfer systems, a communications service quality is guaranteed. A common time interconnected capacity assignment method is used. The capacity assignment is generated for an access point (AP) by mobile and forward terminals (MT, FMT) which can be reached directly. Individual MTs are present in the form of wireless base stations and serve as relay stations (FMTs) for the MTs outside the range of an AP. For an AP, FMTs appear as MTs. The FMT forms a partial frame structure in a part of the AP distribution capacity transfer system, which is embedded in the time frame structure dictated by the commanding central station. Adherence to a required service quality guarantee is achieved by capacity assignment algorithms.

Method for the operation of wireless base stations for packet transfer radio systems having a guaranteed service quality

The invention relates to an interface-control protocol method for a radio system, which has at least one frequency band provided for the two-way alternate utilization of a first and a second radio interface standard. The radio system comprises a number of stations, which each function in accordance with a first radio interface standard and/or in accordance with a second radio interface standard, in which a control station is provided that controls the two-way alternate utilization of the frequency band.

Growing community of inventors

Wuerselen, Germany

Bernhard Walke