search

khaledhassan / eel6591-project

Class Project for EEL6591: Topic to be decided
0 stars 0 forks source link

Investigate S1 handover #4

Closed khaledhassan closed 6 years ago

khaledhassan commented 6 years ago

It seems like S1 handover is automatically integrated in LENA after all? See https://www.nsnam.org/docs/models/html/lte-design.html#s1 for details

Other, more general, useful information is here

khaledhassan commented 6 years ago

It seems like (my assumptions, haven't actually tried it yet) there is support for packets traversing eNBs which do not have an X2 interface (adding an X2 interface is not mandatory), but there is not support for multiple SGWs in a single EPC -- which raises even more questions as to how the authors did this...

This GitHub repo appeared to be working on DMM using ns-3 and seemed to eventually settle for an "S1" handover which was mostly the same as the X2 handover (so much so that they renamed their function from S1HandoverRequest to HandoverRequestWithPgwRelocation) but with a few additonal tweaks. See https://github.com/lucval/dmm-ns-3.17/blob/master/src/lte/helper/lte-helper.cc#L812

More research is probably necessary.

khaledhassan commented 6 years ago

S1 handover is not gonna happen by tonight, and the transit X2 handover idea didn't work either, see branch x2-transit-experiment and pull request #13