Lucent Technologies Inc.

Agere Systems Inc.

Agere Systems Guardian Corp.

Johannes P N Haagh

Wilhelmus J M Diepstraten

Hendrik Moelard

Hendrik Van Bokhorst

Leo Monteban

Rienk Mud

Loeke Brederveld

Jan Hoogendoorn

Albertus M G Claessen

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 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.

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Eindhoven, Netherlands

Johannes P N Haagh