Dear,
About interworking NSS HUAWEI and BSS ALCATEL, one MS was in LAC(1) CellID (A) with TMSI(1), and few seconds later move to LAC(2) CellID (B) with TMSI(2).
Unfortunately, the paging was sent to LAC(1) CellID (A) with TMSI(1) for a MT Call attempted after changing location.
Then, A-party received an announcement “MS is not reachable”.
Could you tell me the possible causes ?
If TMSI reallocation when MS moves from one LAC to another is a normal behavior ?
Best regards
to reduce those radio ping pongs between LAC, you could increase the Cell Reselect Hysteresis (CRH) up to 16dB on both cells.
Your scenario is quite extreme. The duration of a LAU is so short that it’s really bad luck if the MS is changing LAC while NSS is trying to page it. It’s really a matter of few seconds.
The only thing is to avoid ping pong LAU, for sure.
CRH is a good thing. Try also increase TO and PT (temp offset, penalty time), to values 4 (40dB) and 3 (40s) for example, that’s enough to avoid stupid reselections.
Hi Pix,
Thanks for ur reply:
“The duration of a LAU is so short that it’s really bad luck if the MS is changing LAC while NSS is trying to page it”
If TMSI is reallocated so why paging on previous LAC?