Cisco Cisco Packet Data Interworking Function (PDIF) Documentation Roadmaps
New In This Release
▀ LTE/SAE Features
▄ Cisco ASR 5000 Series Product Overview
OL-22937-01
License Keys
Requires separate product license key.
S-GW Features
The Serving Gateway routes and forwards data packets from the UE and acts as the mobility anchor during inter-
eNodeB handovers. Signals controlling the data traffic are received on the S-GW from the MME which determines the
S-GW that will best serve the UE for the session. Every UE accessing the EPC is associated with a single S-GW.
eNodeB handovers. Signals controlling the data traffic are received on the S-GW from the MME which determines the
S-GW that will best serve the UE for the session. Every UE accessing the EPC is associated with a single S-GW.
For each UE associated with the EPS, there is a single S-GW at any given time providing the following basic functions:
Terminates the interface towards E-UTRAN (S1-U)
Functions for the GTP-based S5/S8 include:
local mobility anchor point for inter-eNodeB handover
mobility anchoring for inter-3GPP mobility (terminating S4 and relaying the traffic between 2G/3G
system and P-GW)
ECM-IDLE mode downlink packet buffering and initiation of network triggered service request
procedure
lawful intercept
packet routing and forwarding
transport level packet marking in the uplink and the downlink (e.g. setting the DiffServ Code Point)
Accounting