Agere Systems Inc.

Lucent Technologies Inc.

Ncr Corporation

Agere Systems Guardian Corp.

Hendrik Moelard

Leo Monteban

Adriaan Kamerman

Wilhelmus J M Diepstraten

Rienk Mud

Johannes P N Haagh

Geert Arnout Awater

Hendrik Van Bokhorst

Loeke Brederveld

Jan Hoogendoorn

Wilhelmus Diepstraten

Albertus M G Claessen

Albert Eikelenboom

A communication system with a plurality of access points (AP, AP, AP) and at least one network station (), the network station () being arranged to communicate with one of said the plurality of access points (AP, AP, AP) through a wireless communication protocol, each access point (AP, AP, AP) is able to monitor its access point traffic load and transmit an access point traffic load parameter (ATT) to the network station (), and the network station () is able to monitor its network station traffic load; store a network station traffic load parameter (AUTT); receive access point traffic load parameters (ATT) from the access points (AP, AP, AP); and select a communication connection with one of the access points (AP, AP, AP) using a predetermined cost function taking the access point traffic load parameters (ATT) and the network station traffic load parameters (AUTT) into account.

Wireless LAN with load balancing

A wireless data communication system is operable in a power saving mode wherein stations are synchronized to be in an awake state to receive synchronizing messages (TIM, PSYNC) and traffic indicator information and are changed to a doze state if they are not to receive data messages. In one embodiment all stations () communicate via a base station access point (), which broadcasts synchronizing messages (TIM) at regular intervals identifying stations () that are to receive data messages. In another embodiment all stations () communicate directly with one another, one station assumes the role of a master station and broadcasts synchronizing messages (PSYNC), and stations () desiring to transmit data messages transmit traffic indicator messages (PTIM) to the appropriate destination stations (), in a synchronized awake period just before the next synchronizing message (PSYNC) is expected to arrive.

Wireless data communication system having power saving function

A communication system with a plurality of access points (AP, APAP) and at least one network station (), the network station () being arranged to communicate with one of the plurality of access points (AP, APAP) through a wireless communication protocol, each access point (AP, APAP) is able to monitor its access point traffic load and transmit an access point traffic load parameter (ATT) to the network station (), and the network station () is able to monitor its network station traffic load; store a network station traffic load parameter (AUTT); receive access point traffic load parameters (ATT) from the access points (AP, APAP); and select a communication connection with one of the access points (APAPAP) using a predetermined cost function taking the access point traffic load parameters (ATT) and the network station traffic load parameters (AUTT) into account.

Method and device for communicating at least one packet of data with a predetermined packet size over a communication channel from a transmitter to a receiver, the transmitter having a memory for storing a common set of data rates, the method including the steps of fragmenting the at least one packet into a number of frames with a predetermined frame size by the transmitter, automatically selecting a combination of frame size and one of the common set of data rates by the transmitter such that the transmission time of each of the frames is limited to a predefined value, and transmitting each frame over the communication channel by the transmitter.

Method and device for robust fallback in data communication systems

The present invention relates to a wireless local area network station comprising a signal processing element, a carrier detect sensing element, a defer behavior sensing element, and memory. The network station transmits and receives signals within a communication cell that defines a carrier detect zone and a defer zone around an access point. The network station associates with the access point by transmitting an association request to the access point and by receiving an association response from the access point during entry of the network station into the cell. The network station receives a preferred carrier detect threshold level value and a preferred defer behavior threshold level value from the access point and stores the carrier detect threshold and defer behavior threshold level values in its memory for use during operation while being associated with the access point.

Wireless LAN with carrier sense threshold adaption

A wireless local area network system includes a plurality of base stations connected in a wired local area network. A mobile wireless station can roam through communication cells defined by the base stations. The base stations transmit beacon messages at regular intervals. The mobile station determines the communications quality of the beacon message for the cell in which the mobile station is currently located and if this quality becomes unacceptable, switches to a search mode wherein beacon messages from any base station are received and their communications quality is determined. The mobile station switches to communicate with a base station providing a beacon message with an acceptable communications quality.

Handover method for mobile wireless station

A wireless data communication system is operable in a power saving mode wherein stations are synchronized to be in an awake state to receive synchronizing messages (TIM, PSYNC) and traffic indicator information and are changed to a doze state if they are not to receive data messages. In one embodiment all stations (,) communicate via a base station access point (,), which broadcasts synchronizing messages (TIM) at regular intervals identifying stations (,) that are to receive data messages. In another embodiment all stations (,) communicate directly with one another, one station assumes the role of a master station and broadcasts synchronizing messages (PSYNC), and stations (,) desiring to transmit data messages transmit traffic indicator messages (PTIM) to the appropriate destination stations (,), in a synchronized awake period just before the next synchronizing message (PSYNC) is expected to arrive.

For use in a wireless computer network having a radio relay capable of transmitting messages, a system and method, operable with the radio relay, for selectively repeating a unicast message received from a source end-station only upon some indication that a destination end-station has not received the message. The system includes: (1) a transceiver that receives the unicast message from the source end-station and (2) control circuitry, coupled to the transceiver, that determines whether the destination end-station has received the unicast message and causes the transceiver to refrain from repeating the unicast message if the destination end-station has received the unicast message, the radio relay thereby freed from repeating already-received unicast messages.

Wireless relay with selective message repeat and method of operation

A method to be used in a Source Routed Bridged LAN by which access points maintain location information of mobile stations, and forward packets destined for mobile stations that have moved to another access point. This method resolves the problem that correspondent stations do not (timely) update the routing information to the mobile stations.

Method for connecting roaming stations in a source routed bridged local

A local area network system (10) includes a wired backbone LAN (12) having a plurality of LAN segments (14, 16, 18) interconnected by transparent bridges (26, 44). A plurality of base stations (22, 52) are capable, of communicating with a mobile wireless station (30). In response to a decision at the mobile wireless station (30) to switch communication from a first base station (22) to a second base station (52) a handover request message (172) is transmitted from the mobile wireless station (30) via the backbone LAN (12) to the first base station (22) thereby updating dynamic filtering databases contained in the base stations (22, 52) and transparent bridges (26, 44) through which the handover request message (172) passes as to the new communication location of the mobile wireless station (30).

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Maarssen, Netherlands

Hendrik Moelard