ASN Gateway in a WiMAX Network ▀  
Cisco ASR 5000 Series Product Overview ▄  
Figure 40.  ASN Network Reference Model with ASN Gateway 
ASN Gateway
ASN
HA
H-AAA
Another CSN
R6
R6
R4
R3
R5
Network Service Privider
(NSP)
Network Access Privider
(NAP)
CSN
Another ASN/
ASN-GW
BS
BS
R8
 
 
Connectivity Service Network (CSN) 
The Connectivity Service Network (CSN) is a set of network functions that provide IP connectivity services to the 
WiMAX subscriber. A CSN provides the following functions: 
 
  SS/MS IP address and endpoint parameter allocation for user sessions 
  Internet access 
  AAA proxy or server 
  Policy and admission control based on user subscription profiles 
  ASN-CSN tunneling support, 
  WiMAX subscriber billing and inter-operator settlement 
  Inter-CSN tunneling for roaming 
  Inter-ASN mobility 
  Home agent