CDMA2000 Wireless Data Services
Understanding Simple IP and Mobile IP â–€
Cisco ASR 5000 Series Product Overview â–„
Table 55. HA Assigned IP Address Proxy Mobile IP Call Flow Description
Mobile Node (MN) secures a traffic channel over the airlink with the RAN through the BSC/PCF.
The PCF and PDSN/FA establish the R-P interface for the session.
The PDSN/FA and MN negotiate Link Control Protocol (LCP).
Upon successful LCP negotiation, the MN sends a PPP Authentication Request message to the PDSN/FA.
The PDSN/FA sends an Access Request message to the RADIUS AAA server.
The RADIUS AAA server successfully authenticates the subscriber and returns an Access Accept message to the
PDSN/FA. The Accept message may contain various attributes to be assigned to the MN including the IP address of the
HA to use.
The PDSN/FA sends a PPP Authentication Response message to the MN.
The MN sends an Internet Protocol Control Protocol (IPCP) Configuration Request message to the PDSN/FA with an MN
address of 0.0.0.0.
The PDSN/FA forwards a Proxy Mobile IP Registration Request message to the HA. The message includes such things as a
Home Address indicator of 0.0.0.0, the IP address of the FA (the care-of-address), the IP address of the FA (the care-of-
address), and the FA-HA extension (Security Parameter Index (SPI)).
While the FA is communicating with the HA, the MN may send additional IPCP Configuration Request messages.
The HA responds with a Proxy Mobile IP Registration Response. The response includes an IP address from one of its
locally configured pools to assign to the MN (its Home Address). The HA also creates a Mobile Binding Record (MBR) for
the subscriber session.
The MN and the PDSN/FA negotiate IPCP. The result is that the MN is assigned the home address originally specified by
the AAA server.
While the MN and PDSN/FA are negotiating IPCP, the HA and AAA server initiate accounting.
Upon completion of the IPCP negotiation, the PDSN/FA and AAA server initiate accounting fully establishing the session
allowing the MN to send/receive data to/from the PDN.
Upon completion of the session, the MN sends an LCP Terminate Request message to the PDSN to end the PPP session.
The PDSN/FA sends a Proxy Mobile IP De-registration Request message to the HA.
The PDSN/FA send an LCP Terminate Acknowledge message to the MN ending the PPP session.
The HA sends a Proxy Mobile IP De-Registration Response message to the FA terminating the Pi interface
The PDSN/FA and the PCF terminate the R-P session.
The HA and the AAA server stop accounting for the session.
The PDSN and the AAA server stop accounting for the session.
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