Policy charging and Rules Function (PCRF)

PCRF is an important entity in the LTE core network domain, initially introduced in 3gpp rel 5. It is mainly responsible for policy-making and control decisions. In simple words, if a user needs better quality of service (lets suppose in case of VoLTE ) then it is the responsibility of PCRF to initiate QoS with instructions from IMS. The functionality is listed below
  • Provide QoS information to packet gateway 
  • Dynamically manage and control data sessions. Example: For VoIP session, PCRF will initiate dedicated bearer dynamically
  • Enforce minimum QoS parameters
  • Determine charging policy for packets


  1. PCRF plays a vital role in protecting the domain of a server . Sometimes software house do not proceed further in programming without this PCRF.

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