User's Manual

4Motion Solution
4Motion System Manual 9
 QoS service flow authorization entity
 AAA accounting client
The basic EP functionality of the ASN-GW includes:
 Classification of downlink data into generic routing encapsulation (GRE)
tunnels
 Packet header suppression functionality
 DHCP functionality
 Handover functionality
The WIMAX Forum NWG has adopted two different approaches for ASN
architecture - centralized and distributed: In the centralized approach there is at
least one central ASN-GW, and the BTS NPU operates in transparent mode, as
shown in Figure 1-4.
Figure 1-4: Centralized Network Reference Model