The Packet Data Network Gateway (PGW) provides the connection between EPC and a number of external data networks by being the point of exit and entry of traffic for the UE. A UE may have simultaneous connectivity with more than one PDN GW for accessing multiple PDNs. Thus it is comparable to GGSN in 2G/3G networks. A major functionality provided by a PDN gateway is the QoS coordination between the external PDN and EPC. Therefore the PDN gateway can be connected via S7 or Gx to a PCRF (Policy and Charging Rule Function).
The main function of PGW are :
- External IP point of interconnect
- IP address allocation
- Packet routing & forwarding between SGW to external Data Networks
- charging & Lawful intercept support
- Policy enforcement
- In home or visited network
- Packet screening (firewall functionality)
No comments:
Post a Comment