Manual

Cisco Packet Data Serving Node (PDSN) Release 2.0
Resource Management
23
12.3(11)T
The HAAA sends the information received from the Billing Server into a RADIUS Access-Accept
message to be sent to the PDSN. The attributes that are encapsulated into a PPAQ VSA include:
• Quota ID
• Allocated quota into VolumeQuota parameter
• Threshold corresponding to the assigned quota into VolumeThreshold parameter
The Attributes encapsulated inside PTS attribute includes:
• QuotaID, same as the PPAQ attribute
• TariffSwitchInterval that indicates the time (in seconds) remaining before which the tariff switch
condition will trigger.
• TimeIntervalafterTariffSwitchUpdate that indicates the duration after tariff switch point when the
PDSN will send an on-line Access Request if threshold point is not reached.
After the PDSN recieves the Access-Accept message from AAA, it parses the RADIUS packet and
retrieves the attributes inside it. It stores the information present in the packet updating with the quota
allocated for the flow and the current threshold value corresponding to the allocated flow. It also stores
the new Quota-ID allocated for the current quota.
Additionally, the PDSN re-starts the timer indicated in TariffSwitchInterval attribute. This time indicates
the time remaining in seconds before the next tariff switch condition will be hit.
Step 6 User data (IP datagrams) continues to flow through the Prepaid flow, and is accounted in both upstream
and downstream directions. The bytes consumed are checked against the quota allocated for the flow.
Step 7 The timer for the tariff switch interval expires, and indicates the tariff switch point for the flow is hit.
The PDSN continues to count the total number of octets flowing through the session in upstream and
downstream direction, and also the number of bytes switched by the PDSN after the tariff switch trigger
point. If TimeIntervalafterTariffSwitchUpdate was sent by AAA, then the PDSN will start a timer with
this value after the tariff switch point is reached.
Step 8 User data (IP datagrams) that flows through each Prepaid flow continues to be accounted in both
upstream and downstream directions until the next threshold point is reached. The PDSN counts the total
number of bytes switched till last quota update, and also the total number of bytes switched by PDSN
after the Tariff Switch trigger point is hit. The bytes consumed are checked against the quota allocated
for the flow.
Step 9 Once the VolumeThreshold value is reached for the quota allocated in VolumeQuota value for the flow
or timer corresponding to TimeIntervalafterTariffSwitchUpdate expires, the PDSN sends quota update
information in an Access Request Message to AAA and Billing Server. This on-line RADIUS
Access-Request message contains following attributes in the PPAQ VSA:
• Update-Reason Sub-Type that is set to indicate “Threshold reached” (= 3) if threshold is reached.
Otherwise, it is set to indicate “Tariff Switch Update” (=9) if TimeIntervalafterTariffSwitchUpdate
expires
• The Quota ID previously received
• The utilized volume in the VolumeQuota Sub-Type
The PTS attribute contains following subtypes:
– Quota ID previously received
– VolumeUsedAfterTariffSwitch (VUATS) attribute, that contains the total number of octets
being switched by the PDSN after tariff switch trigger point.
The HAAA authorizes the RADIUS packet and, if authorization is successful, forwards the
prepaid-related information present in the packet to the Billing Server.