Jaroslava Fiedlerova
e1a327ca4f
NR UE: add support for multiple RF frontends
This MR adds basic support for multiple RF-frontends at the UE.
There are multiple reasons why we might want this:
1. There might be different antennas needed for different bands (e.g. NTN or
TN antennas). These antennas might be connected to different RF-frontends.
In case of Handover, the UE needs to dynamically switch between these
RF-frontends.
2. Each rf-simulator connection carries baseband I/Q samples. To be able to
perform a handover between two cells at different frequencies, there must
be two rf-simulator connections, as the baseband channels should not
interfere and thus cannot simply be added.
3. When we want to support multiple UE simulation within one instance of
nr-uesoftmodem, and allow multiple cells and probably even handover between
these cells, we need either:
1. dedicated RF-frontends for each simulated UE, or
2. dedicated RF-frontends for each connected cell and dynamically assign
simulated UEs accordingly.
This MR implements what is needed for 1., 2. and 3.1.
This directory contains files related to initialization of variables/structures init_top.c : initialize top-level variables and signal buffers, FFT twiddle factors, etc. lte_init.c : LTE specific initlization routines (DLSCH/ULSCH signal buffers for RX, data buffers for TX, etc.) lte_param_init.c: used only in unitary simulations. initializes the global variables eNB and UE. lte_parms.c: contains init_frame_parms to initialize frame parameters structure