Q. PCRF uses which command on Gx to install rules?
a) UDR
b) STR
c) RAR
d) Charging Rule Install (CCR U)
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Correct answer: Letter d.
On the Gx interface, the PCRF communicates with the PCEF (e.g., PGW) using Diameter messages. To install or modify policy and charging rules, it uses the Credit-Control Request Update (CCR-U) command.
This message enables the PCRF to send dynamic policy rules, such as QoS parameters, gating controls, or charging rules, to be enforced by the PCEF.
CCR-U is part of the Diameter Credit-Control Application (DCCA) and is essential for real-time policy control and charging in IMS and LTE networks.
Q. PCRF uses which command on Gx to install rules?
a) UDR
→ Incorrect. UDR (User Data Request) is used on the Sd or Ud interface (from PCRF to UDRF or HSS), not on Gx.
b) STR
→ Incorrect. Session Termination Request (STR) is used on the Cx or Rx interface for IMS sessions, not for rule installation.
c) RAR
→ Incorrect. Re-Auth Request (RAR) is used on Rx (between PCRF and AF) or Gy, not for rule installs on Gx.
d) Charging Rule Install (CCR U)
→ Correct. CCR-U is the update request from PCRF to install, modify, or remove PCC rules via the Gx interface. CCR Update delivers PCC rules with TFT and QoS.
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