Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Proton conducting electrolytes with cross-linked copolymer additives for use in fuel cells
Combined high and low frequency stimulation therapy
Image sensor with improved color crosstalk
Flow cytometer method and apparatus
Maintenance guidance display device, maintenance guidance display method, and maintenance guidance display program
Simultaneous wafer bonding and interconnect joining
Communicating channel state information using predictive vector quantization
  Randomly Featured Patents
Expression of heterologous multi-domain proteins in yeast
Intelligent job matching system and method including preference ranking
Workroom storage system
Apparatus for producing a container matrix
All-reflective zoom optical system
Method of isolating adult mammalian CNS-derived progenitor stem cells using density gradient centrifugation
Drill-down apparatus for display of tree-based hierarchies and method therefor
Queued port data controller for microprocessor-based engine control applications
Creative art kit for producing and viewing stereoscopic creative art images
Method of and device for preventing disturbance of unfixed visible image