SPR Proxy Mechanism for 3GPP Policy and Charging Control System
3GPP has standardized its Policy and Charging Control (PCC) system to provide dynamic policy control combined with real-time charging. The specific guidance on how PCC signaling delay can be reduced in session setup has not been explored in 3GPP standard. To bridge this gap, the authors propose an SPR proxy mechanism to shorten the PCC record retrieval delay which occurs between two PCC nodes: the Policy and Charging Rule Function (PCRF) and the Subscription Profile Repository (SPR). Their proposed SPR proxy is implemented at the PCRF to store the serving users' PCC records retrieved from the SPR. Once the PCC records are updated by the subscribers, the SPR needs to refresh the SPR proxy in order to retain the record validity.