Subscriber Tracing in lte
Subscriber Tracing provides detailed information at the call
level for the UE(user).
This is done in the lte network elements(MME ,SGW,PGW)
to measure the performance of network elements as well as the quality of
services given to the user while using lte network.
Subscriber is also traced on demand of the user itself if it
is not getting the good or appropriate quality of services from the lte
network.
Operator can also trace some of the random users to check
the quality of network.
Purpose of Subscriber Tracing in lte network:
-
Optimize the lte network performance.
-
Upon user demand if it is not getting the good quality
of services from the network.
Operator applies the tracing on lte network elements for the
specific users based on any one of the information provided by user i.e. IMSI
or IMEI or MSISDN.
How Subscriber Tracing Works:
Two types of Subscriber Tracing can be done in network.
1. Management
based.
2. Signaling
based.
In management based tracing operator configure User id type
(imsi(0) or imei(1) or msisdn(2)) and User id value (imsi value) on the lte
node(pgw,sgw,mme) from which operator wants the traces for user.
Example: UE type – IMSI, UE value – 1234566778899, Node –
PGW.
Now when the UE tries to attach with the lte network all the
traces sent to TCE(external entity) by PGW.
Traces contains all the details related to the user like
apn, plmn, imsi, rat type, qos parameters, user location etc.
In Signalling based tracing operator modify the
configuration data in HSS with subscriber tracing enabled for the particular
UE. Whenever UE attaches with the network, HSS sends Subscriber tracing enabled
in the Subscription data in message Update Location answer and then MME
forwards subscriber tracing parameter in Create Session request to SGW and then
to PGW. Upon receving this parameter all the nodes starts tracing of that user
and send all the trace records to TCE (Trace Collection entity).
Configuration for Signaling based Subscriber Tracing.
In HSS –
1. Trace
depth – Low, medium, high. (At what detailed level traces required).
2. Nodes
– SGW, MME , PGW. (On which of the node
tracing is required).
3. Interfaces
– S5,S8,S11,Gx,Gn etc. (On which interface tracing is required).
4. TCE
Address – Ip address of TCE. (Which ip
address node should send traces).
Configuration for Management based Subscriber Tracing.
In SGW,PGW,MME –
1. Trace
Depth – Low, medium, high.
2. Type
of Traces – XML , Syslog.
3. TCE
Address – Ip address of TCE.
Note: In operator based tracing two types of tracing is
possible XML, Syslog.
but in Signaling based only xml tracing is possible.
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