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WiMAX Network Architecture

By Vikas Bagwe
WiMAX Network Architecture developed by the WiMAX Forum

All IP network
  • Existing IP standards used to avoid creating new network entities
  • WiMAX Forum defines procedures that permit WiMAX to 3GPP and WiMAX to 3GPP2
Access Service Network (ASN)
  • Provides the radio interface that connects the SS with the network
  • Handles the radio interface and contains the base stations
  • Contains the ASN Gateway which has a one-to-many relationship with base stations
  • ASN Gateway handles mobility between base stations
  • Foreign Agent function acts as proxy for authentication and mobile IP
Connectivity Service Network (CSN)
  • Provides connectivity between the ASN and the Internet or Application Services
  • Home Agent and AAA provide Authentication
  • Home Agent and DHCP provide IP Address Management
  • AAA provides billing records
  • Home Agent supports mobility
Logical Interfaces

802.16 Interfaces
  • R1 interface – SS to BS connection, radio link
WiMAX Forum Interfaces
  • - R2 interface – SS to HA, supports roaming
  • - R3 interface – ASN to CSN, supports authentication, billing, and MIP messages
  • - R4 interface – ASN to ASN, defines mobility procedures when a SS crosses from one ASN to another
  • - R5 interface – CSN to CSN, supports roaming
  • - R6 interface – BS to ASN Gateway, supports mobility messages
  • - R7 interface – Internal to the ASN Gateway, not shown
  • - R8 interface – BS to BS, supports handoff
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