Patents by Inventor Lionel F. Ulmer

Lionel F. Ulmer 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).

  • Security in wireless communication system and device
    Patent number: 8995664
    Abstract: A method of implementing security in a wireless communication device (108) comprises receiving (300), at the device (108), a security mode command for activating a security mode in the device and storing a sequence number of the received security mode command. A security mode complete or failure message is sent (302) based on whether a security mode is activated in the device. An acknowledgement of the security mode complete or failure message is received (304) and a timestamp of the acknowledgement is stored. On receiving a PDU, sequence numbers and timestamps of segments of the received PDU are compared (306) with the stored sequence number and timestamp of the acknowledgement. The received PDU segments are managed (308) in response to the comparisons, and the sending of the security mode complete or security mode failure message. A wireless communication device is also disclosed.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: March 31, 2015
    Assignee: Google Technology Holdings LLC
    Inventors: Matthieu Baglin, Lionel F. Ulmer
  • SECURITY IN WIRELESS COMMUNICATION SYSTEM AND DEVICE
    Publication number: 20140026180
    Abstract: A method of implementing security in a wireless communication device (108) comprises receiving (300), at the device (108), a security mode command for activating a security mode in the device and storing a sequence number of the received security mode command. A security mode complete or failure message is sent (302) based on whether a security mode is activated in the device. An acknowledgement of the security mode complete or failure message is received (304) and a timestamp of the acknowledgement is stored. On receiving a PDU, sequence numbers and timestamps of segments of the received PDU are compared (306) with the stored sequence number and timestamp of the acknowledgement. The received PDU segments are managed (308) in response to the comparisons, and the sending of the security mode complete or security mode failure message. A wireless communication device is also disclosed.
    Type: Application
    Filed: June 11, 2013
    Publication date: January 23, 2014
    Applicant: MOTOROLA MOBILITY LLC
    Inventors: Matthieu Baglin, Lionel F. Ulmer