▀ ASN Mobility Management
▄ Cisco ASR 5000 Series Product Overview
The subscriber‘s context is retrieved and exchanged between the serving base station and a target base station during
handover.
The ASN Gateway authorizes service flows according to the subscriber‘s profile. Allowed service flows and active
service flows can change over time, so the ASN Gateway provides admission control for downlink traffic. The ASN
Gateway creates a GRE tunnel per service flow.
Inter-ASN Handovers
During a handover, the ASN Gateway provides the subscriber‘s context to a target base station and when requested,
changes the data path. To minimize latency and packet loss, the ASN Gateway implements data integrity through bi-
casting or multi-casting. For paging, buffering is also supported. A foreign agent maintains the IP connectivity if the
mobile subscriber initiates an inter-ASN handover. The ASN Gateway supports either Proxy-Mobile IP (PMIP) or
Client-Mobile IP (CMIP) in order to communicate with home agents.
The ASN Gateway maintains location information to provide the paging service that tracks subscribers when they are
operating in idle mode. If there is any download traffic, ASN Gateway requests the PC to trigger paging. During active
operation, location information is also updated as the mobile subscriber moves to a new base station.
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