GPRS Conversation

[Rick Bywater <rbywater () tecore com>]

I have been looking into writing code to handle GRPS conversations, but
do not know how to proceed.  The existing conversation code is
address/port based.  In GPRS, conversations between the GSN and mobile
equipment are identified by their TLLI, not the address:port which is
delivering the traffic.  To complicate matters, the TLLI changes over
time.  I noted an exchange on the wireshark-dev
(http://www.wireshark.org/lists/wireshark-dev/200906/msg00315.html)
which describes a similar situation with one notable exception -
mobility.  I see no means to track a mobile device across existing
BSS-GSN "conversations."

This problem exists in other cases besides GSM, as well.  Suppose you
have a device, D, access points AP1, AP2, and AP3, and mobile device,
MD1.  A wireshark trace would show conversations between D and AP1, D
and AP2, and D and AP2, and (potentially) 3 conversations between D and
MD1 as MD1 moved between the three access points.  However, there is no
mechanism to tie these together.

Anyone have a suggestion on how to resolve this?


Regards,

Rick Bywater

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