ASN Call Procedure Flows â–€
Cisco ASR 5000 Series Product Overview â–„
The serving BS sends HO_Conf messages to the selected target BS with other context information and starts
R8_HO_Confirm Timer.
The target BS accepts the request and sends the HO_Ack message to serving BS and serving BS stops R8_HO_Confirm
Timer.
Target BS sends MAC Context Request message to the anchor ASN Gateway.
The Anchor ASN Gateway forwards the MAC Context Request to the serving BS.
Serving BS sends MAC Context Report information to anchor ASN Gateway.
Anchor ASN Gateway forwards MAC Context Report information to the target BS.
Target BS sends Authentication Context Request to anchor ASN Gateway.
Anchor ASN Gateway transfers Authentication Context information to target BS.
MS starts ranging with target BS and sends RNG-REQ to the target BS and network reentry completed.
Target BS sends Data Path Registration Request to anchor ASN Gateway.
Anchor ASN Gateway sends Data Path Registration Response to target BS.
Target BS sends Data Path Registration Ack message to anchor ASN Gateway and R6 data path established.
Target BS sends CMAC Key count Update message to anchor ASN Gateway.
Anchor ASN Gateway sends CMAC Key Count Update Ack message to target BS and handover completed.
Anchor AS NGW starts Data Path De-registration process with serving BS.
Serving BS releases all resources and terminates data path with MS.
Inter-ASN Gateway Handover
This section describes the procedure of inter-ASN Gateway handovers through an R4 interface for a WiMAX
Subscriber Station (SS). The R4 reference is the interface over which ASN control and data messages are exchanged
between two ASN Gateways, either within the same ASN or across separate ASNs.
For a given subscriber, a WiMAX session may be handled by ASN Gateway functions located in different physical
nodes in the network. For example, the authenticator and FA may be located in ASN Gateway x and the R6 Data Path
Function in ASN Gateway y. The various ASN Gateway functions communicate over the R4 interface.
The following inter-ASN Gateway handover scenarios are supported on the ASN Gateway over the R4 interface:
Important: Not all features are supported on all platforms.
Controlled Anchor ASN Gateway to Non-Anchor ASN Gateway Handover
Controlled Non-Anchor ASN Gateway to Anchor ASN Gateway Handover
Controlled Non-Anchor ASN Gateway to Non-Anchor ASN Gateway Handover
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