Few doubts about TFT -
1. What is the role of TFT in LTE is it just limited at PGW or more then that.
2. How this is applied at PGW.
related to this query http://tech.queryhome.com/10563/how-ip-packet-flows-from-internet-world-to-lte-network
Downlink TFTs is used just for P-GW to decide which bearer that packet should go.
It is not useful for UE (or i miss something?)
Therefore, why PGW sends Downlink TFTs to UE?
I am not sure whether my understanding is correct or not. As per my knowledge, UL-TFT at UE side takes care of IP packet to bearer mapping. I have seen many reference of LTE UE stack for user plane and found IP layer is just above the PDCP layer.
Packet filters are communicated to UE from the network using NAS signalling.
I just want to know where exactly/which layer is responsible to do bearer mapping at UE side.
I am looking for uplink/downlink packet structure at PGW as well as eNB.