[srslte-users] Paging UE and sending Downlink NAS Transport messages

[Pedro Alvarez]

There is some code to pack/unpack Downlink NAS Transport messages in
the liblte_mme.cc files.
If you want to implement this you would have to change the nas classes
on srsUE and srsEPC (srsue/src/stack/upper/nas.cc and
srsepc/src/mme/nas.cc).

You should be able to trigger paging by sending traffic to the UE when
it's in RRC idle. The SPGW will trigger the Downlink Data notification
and the MME will send the S1AP paging message to the respective eNBs.