Passing parameters/Values From One Project To Another Project In SSIS 2012

I am Using SSIS 2012 & Created 2 Projects A & B (Project Model Deployment)

Project A 
Master_Package (Includes Project A/Packages 1,2,3)
Package1
Package2 
Package3 

Project B
Master_Package (Includes Project B/Packages 1,2,3)
Package1 
Package2 
Package3 

I Am Calling  Project B (Master_Package)  From Project A (Master_Package) Using (EXEC [SSISDB].[catalog].[start_execution])

But i Also Want Pass Some Values From Project A (Master_Package) To Project B (Master_Package)..... How Can i Do this ?