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?
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