Description  Claims  Drawing  Cited references 

WO2014108801A1   [0006] 
WO2010027356A1   [0006] 
US20120157041A1   [0006] 
US2011125509A1   [0007] 

Technical Specification 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Telecommunication management; Charging management; Charging architecture and principles (Release 12)   [0005]