Some questions and answers on LTE EPC architecture

1. Which node handles IP point of presence?


The P-GW


2. Which node handles IP address allocation?


The P-GW


3. Which node handles charging per UE and intra LTE mobility anchor?


The S-GW


4. Which node handles subscription data?


The HSS (Home Subscriber Server)


5. Which node handles Authentication, NAS signaling and paging?


The MME



6. What is the Converged Packet Gateway?


A combined P-GW and S-GW (also called SAE GW) based on the SmartEdge 1200 platform.


7. Which node (function) is handled by SAPC?


PCRF(Policy and Charging Rules Function)


8. Why is MME and S-GW pooling used?


There are two main reasons: redundancy and load balancing.


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