Which interface is used between PCRF and PGW for policy?

Interview
1

Q. Which interface is used between PCRF and PGW for policy?

a) Gx
b) Zh
c) Rx
d) Cx

Check 🔎

:arrow_right: Correct answer: Letter a.

The Gx interface is used between the PCRF (Policy and Charging Rules Function) and the PGW (Packet Gateway) for policy control and QoS enforcement in LTE networks. It carries policy rules from PCRF to PGW.

Q. Which interface is used between PCRF and PGW for policy?

a) :white_check_mark: “Gx”
→ Correct. Gx handles policy enforcement between PCRF and PGW. Gx provides PCC rules and charging to the PGW.

b) :x: “Zh”
→ Incorrect. Zh is used between HSS and AAA server (for authentication).

c) :x: “Rx”
→ Incorrect. Rx connects PCRF and AF (Application Function).

d) :x: “Cx”
→ Incorrect. Cx is used between HSS and IMS CSCF.