Cisco Cisco IOS Software Release 12.4(2)XB6

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Cisco Packet Data Serving Node (PDSN) Release 4.1 for Cisco IOS Release 12.4(15)XR7
 
Cisco Packet Data Serving Node (PDSN) Release 4.1 for Cisco IOS Release 12.4(15)XR7
PDSN Accounting
The CDMA2000 packet accounting model is divided into radio specific parameters collected by the radio 
network elements, and the IP network specific parameters collected by the serving PDSN. In 
conformance with the packet accounting procedures specified in TIA/EIA/IS-835-D, the PDSN merges 
the radio specific parameters for a given user session with the IP network specific ones to form a Usage 
Data Record (UDR). After merging the parameters, the PDSN sends the UDR to the local RADIUS 
server at trigger events specified. The PDSN maintains the UDR until it receives positive 
acknowledgment from the RADIUS server indicating that the RADIUS server has correctly received the 
UDR.
Flow Based Accounting
The Cisco PDSN supports multiple user sessions per mobile station. Each of these user sessions is 
termed a flow. For each mobile station, one Simple IP based flow and one or more Mobile IP based flows 
can be supported. Each flow is identified by a unique IP address. Accounting procedures for generating 
a separate UDR for each flow is called flow based accounting.
The Cisco PDSN supports flow based accounting. As per TIA/EIA/IS-835-D specifications, each flow 
is identified by a unique Correlation-ID. Accounting start/stop message pair for each flow is correlated 
by unique Accounting-Session-ID. 
While creating UDRs for flow based accounting, radio specific accounting parameters are common to 
all flows. IP network specific parameters, such as uplink and downlink octet counts are specific to each 
flow and are identified by the unique IP address assigned to that flow. The PDSN creates UDR for each 
flow by merging the radio specific parameters and the IP network specific parameters. These UDRs are 
forwarded to the RADIUS server via accounting-request (start, stop, interim) messages.
The following RADIUS attributes are contained in the UDR sent by the PDSN.
Table 13
In Accounting Start Record
Attribute Name
TIA/EIA/IS-835-B
Type/Subtype
NAS-IP-Address
D2
4
NAS-Port
5
NAS-Port-Type
61
User-Name
B2
1
Calling-Station-Id
A1
31
Acct-Status-Type
40
Acct-Delay-Time
41
Acct-Authentic
45
Service-Type
6
Acct-Session-Id
C1
44
Framed-Protocol
7
Framed-IP-Address
B1
8
Event-Timestamp
G4
55
CDMA-Correlation-ID
C2
26/44