Resource: Diameter Gx Interface Tutorial

   
If you need to better understand 3GPP's "LTE, 4G, MME, PGW, SGW, Interfaces and beyond" visit Bart Barton's "LTE and Beyond" blog.

 

His recent post covers the Gx signaling protocol - "The Gx reference point is used for provisioning and removal of Policy and Charging Control (PCC) rules from the PCRF to the PCEF and the transmission of traffic plane events from the PCEF to the PCRF. The Gx reference point can be used for charging control, policy control or both by applying AVPs relevant to the application",

See "Gx interface - sitting between PCRF and PCEF" - here.