User's Manual

10 4Motion System Manual
Chapter 1 - System Description
In the distributed approach, the BTS NPU operates in ASN-GW mode, as shown in
Figure 1-5.
Alvarion believes in providing operators with the flexibility to select the mobile
WiMAX network topology that best suits their needs and existing network
architecture. Therefore, 4Motion is designed to support both distributed and
centralized topology approaches according to WiMAX Forum NWG profile C.
1.2.2.7 Reference Points
 Reference point R1 consists of the protocols and procedures between the MS
and ASN as per the air-interface (PHY and MAC) specifications (IEEE 802.16e).
 Reference point R2 consists of protocols and procedures between the MS and
CSN associated with authentication, services authorization and IP host
configuration management. This reference point is logical in that it does not
reflect a direct protocol interface between the MS and CSN. The authentication
part of reference point R2 runs between the MS and CSN operated by the
home NSP, however, the ASN and CSN operated by the visited NSP may
partially process the aforementioned procedures and mechanisms. Reference
point R2 might support IP host configuration management running between
the MS and CSN (operated by either the home NSP or visited NSP).
Figure 1-5: Distributed Network Reference Model