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Configuring Subscriber Session Tracing
Management Activation
With a management-initiated activation, the WEM sends an activation request directly to the NE where the trace is to be
initiated. The NE establishes the trace session and waits for a triggering event to start actively tracing. Depending upon
the configuration of the trace session, the trace activation may be propagated to other NEs.
Signaling Activation
With a signaling based activation, the trace session is indicated to the NE across a signaling interface via a trace
invocation message. This message can either be piggybacked with an existing bearer setup message (in order to trace all
control messages) or by sending a separate trace invocation message (if the user is already active).
Start Trigger
A trace recording session starts upon reception of one of the configured start triggers. Once the start trigger is received,
the NE generates a Trace Recording Session Reference (unique to the NE) and begins to collect and forward trace
information on the session to the TCE.
List of trigger events are listed in 3GPP standard 3GPP TS 32.422 V8.6.0 (2009-09).
Deactivation
Deactivation of a Trace Session is similar whether it was management or signaling activated. In either case, a
deactivation request is received by the NE that contains a valid trace reference results in the de-allocation of the trace
session state block and a flushing of any pending trace data. In addition, if this is the last trace session to a particular
TCE, the (S)FTP connection to the TCE is released after the last trace file is successfully transferred to the TCE.
Stop Trigger
A trace recording session ends upon the reception of one of the configured stop triggers. Once the stop trigger is
received, the NE will terminate the active recording session and attempt to send any pending trace data to the TCE. The
list of triggering events can be found in 3GPP standard 3GPP TS 32.422 V8.6.0 (2009-09).
Data Collection and Reporting
Subscriber session trace functionality supprots data collection and reporting system to provide historical usage adn event
analysis.
All data collected by the NE is formatted into standard XML file format and forwarded to the TCE via (S)FTP. The
specific format of the data is defined in 3GPP standard 3GPP TS 32.423 V8.2.0 (2009-09)
Trace Depth
The Trace Depth defines what data is to be traced. There are six depths defined: Maximum, Minimum, and Medium all
having with and without vendor extension flavors. The maximum level of detail results in the entire control message
getting traced and forwarded to the TCE. The medium and minimum define varying subsets of the control messages
Subscriber Session Trace Functional Description ▀
Cisco ASR 5x00 Packet Data Network Gateway Administration Guide ▄
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