User Manual

BreezeCOMPACT System Manual
Chapter 1 - System DescriptionAbout WiMAX
Chapter 1 - System Description About WiMAX
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In the distributed approach, the BTS operates in ASN-GW mode, as shown in Figure 1-4.
Telrad 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.
1.1.2.7 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).
 Reference point R3 consists of the set of control plane protocols between the ASN and CSN to
support AAA, policy enforcement and mobility management capabilities. It also encompasses the
bearer plane methods (e.g. tunneling) to transfer user data between the ASN and CSN.
 Reference point R4 consists of the set of control and bearer plane protocols originating/terminating
in various functional entities of an ASN that coordinate MS mobility between ASNs and ASN-GWs. R4
is the only interoperable reference point between similar or heterogeneous ASNs.
Figure 1-4: Distributed Network Reference Model