Patents by Inventor Johan Ebenhard

Johan Ebenhard has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method to put a mobile terminal into sleep when a frame control channel containing a location of slow broadcast channel does not include wakeup information
    Patent number: 6622251
    Abstract: In a WLAN where an AP and MTs use a duplex airlink having a MAC frame structure to communicate with each other, the AP places wakeup PDUs at different locations in a MAC frame to allow the MTs to conserve energy by maximizing sleep time. In other embodiments, the wakeup PDUs are sequenced by MAC-ID so that a MT can conclusively determine whether remaining wakeup PDUs in a sequence can contain its MAC-ID, and go to sleep early if they cannot. In another embodiment, a wakeup PDU type can indicate to a corresponding MT whether the MT can expect downlink data later in the same MAC frame. In addition, the wakeup PDU type can indicate to the MT that the MAC frame that it should awaken and remain awake to receive downlink data in the future.
    Type: Grant
    Filed: March 17, 2000
    Date of Patent: September 16, 2003
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Jan Lindskog, Göran Malmgren, Lorens Almehag, Fabian Wenger, Johan Ebenhard, Ulf Hansson