Resources Contact Us Home
Method for time stamp-based replay protection and PDSN synchronization at a PCF

Image Number 2 for United States Patent #7116668.

A packet control function (PCF) exchanging messages with a packet data serving node (PDSN) in a wireless communication network guards against malicious or erroneous message replay by checking the "reasonableness" of PDSN time stamps in registration messages it receives over its PDSN interface. Received messages that are too old are rejected by the PCF, even if otherwise valid. A configurable time threshold may be set at the PCF that determines the allowable maximum age of a received message. Further, because messages received from the PDSN contain echoed identifier values generated by the PCF, the PCF may implement identifier value function generation that insures no repeated identifier values over a desired interval. The desired interval is set larger than the allowable message age to further guard against attempted message replay.

  Recently Added Patents
Cosmetic/dermatological compositions comprising naphthoic acid compounds and polyurethane polymers
Methods and apparatus to perform time zone determination by a mobile station
Eye therapy system
Method and apparatus for triggering expiration of a data tag device
Control device
Inter-carrier communications for multimedia-message delivery
  Randomly Featured Patents
Plane mechanical keyboard
Control apparatus of induction motor
Multi-wall package
Network service system using temporary user identifier
Method and apparatus for enhanced lifetime and performance of ion source in an ion implantation system
Multi-phase separation methods and apparatus
Method for the treatment of cancer by use of the copper complex of S-(methylthio)-DL-homocysteine or the L-enantiomorph thereof
Flexible tooth with interchangeable elements for a plowing apparatus
Method and system for monitoring point of sale exceptions
Convertible dance shoe