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Harald Welte c4bcd6e287 [ENB] Add CFSB support
This commit introduces CSFB (circuit switched fall-back) capabilities to
srsLTE.  Actually, all the eNB has to do is to send a
RrcConnectionRelease with the RedirectedCarrierInfo IE.

The MME triggers this by the S1AP CS Fallback Indicator IE, which may
be present either in the Initial Context Setup Requst or in the
UE Context Modification Request.

As srsLTE has no support for the UE Context Modification Request at all
yet (!), basic support for this message is introduced in this patch.

Both Mobile Originated and Mobile Terminated CSFB with a coupel of
different UE models have been verified using this patch in a setup
consisting of srsENB attached to an undisclosed EPC connected via SGsAP
to a complete  Osmocom 2G network.

Closes: #358
Closes: #363
5 years ago
..
examples Fixed incorrect DCI location assignment in pdsch_enodeb.c example 5 years ago
include [ENB] Add CFSB support 5 years ago
src Fixed inverted interpretation of new data indication (ndi) field in dci_format1As_pack() function 5 years ago
test adding fixes and tests for eMBMS 6 years ago
CMakeLists.txt update copyright notice 6 years ago