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Testing works up to the reception of SIB1/2/3 from the UE through nfapi, but there is an issue with missing some of the nfapi messages for some frames.

Introduced a new timer_thread within lte-ue. This thread is ticking the subframes and wakes up UE_thread function which is waiting on a condition variable for nfapi_mode=3 (phy_stub)

modifications for TDD and IF4p5 (in particular TDD). Both in RRU and RAU components. Monolithic is unchanged.

Merge from RU-RAU-split and fix of frame/subframe handling.  Was very confused with the counter in the main loop, the incrementing from the USRP read library and the nFAPI frame handling.  RACH seen on wireshark and something happens on VNF

Definition of the UE<->eNB MAC to MAC interface based on nFAPI structures: Currently supporting the triggering of MAC layer Rx operations at the UE side based on the reception of NFAPI DL messages. Partial definition of Sidelink MAC subheaders.

Definition of the UE MAC interface: IF_Module_UE.h, IF_Module_UE.c, UE_MAC_interface.h and the supporting functions.

How to use:

1 - compilation of softmodem:
  ./build_oai --eNB -t ETHERNET

2 - compilation of mobipass driver:
  cd cmake_targets/lte_build_oai/build
  make oai_mobipass
  ln -sf liboai_mobipass.so liboai_transpro.so

3 - configuration:
  edit the configuration file, set "node_timing" to
  "synch_to_mobipass_standalone"
  that is, have the line:
    node_timing               = "synch_to_mobipass_standalone";

4 - run:
  run as usual: sudo ./lte-softmodem -C <configuration file>

addition of MPDCCH format 5. X_u_br sequences for BL/CE UE support and bugfixes in rx_prach0 for eMTC.

complete programming of Msg2/Msg4 procedures for eMTC. Addition of skeleton for PUCCH UCI (NFAPI) in L1. Some cleanup of eNB_scheduler.c

L1/L2 scheduling extensions for BL/CE operation, BR random-access procedure, BR PRACH detection. Still untested, but compilation succeeds. Missing elements in L2 - PUSCH programming for Msg3, Msg4 retransmission programming for BL/CE. DLSCH/ULSCH programming for UE-specific DLSCH/ULSCH for BL/CE

Note: this commit is work in progress. Contains initial integration of NFAPI data structures which are tested for TX path. RX path to follow.