Installation Manual

Chapter 1 - System Description System Overview
BreezeMAX Extreme 15 System Manual
 Handover management
 QoS service flow management entity
1.2.5.6 ASN Gateway (ASN-GW)
check accuracyThe ASN-GW is a network entity that acts as a gateway between
the ASN and CSN. The ASN functions hosted in an ASN-GW may be viewed as
consisting of two groups - the decision point (DP) and enforcement point (EP). The
EP provides bearer plane functions, and the DP provides non-bearer plane
functions.
The basic DP functionality of the ASN-GW includes:
 Implementation of EAP Authenticator and AAA client
 Termination of RADIUS protocol against the selected CSN AAA server (home or
visited AAA server) for MS authentication and per-MS policy profile retrieval
 Storage of the MS policy profile
 Generation of authentication key material
 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 1-6.