Classification and Flow Control in PGW

PDN Gateway(PGW) is one of the major module in EPC system. PGW is exit and entry point in LTE for ingress and egress data traffic packets of UE, which connects UE to external PDN.For downlink data received from Packet data networks (PDN), should be classified based on IP headers and apply classification Rules. In the downlink, ingress IP packets destined for different UEs, are classiffied by PGW and forward to respective QoS-based bearers of respective UEs.Traffic Flow Templates (TFTs) are assigned to each QoS-bearer, classification is performed based on these TFTs.Each GBR bearer is assigned with QoS parameters, PGW uses these QoS for performing flowcontrol.Irrespective of incoming rate, flow has to be controlled and sent to mobile as per the QoS rule.Here we are using token bucket algorithm for flow control.This paper reviews how Classification and Flowcontrol done in PGW.