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NR UE Cell Search

Sakthivel Velumani requested to merge NR_UE_cell_search into develop

Till this commit, the UE gets the position of SSB in frequency from command line and does the syncronization by locating the SSB in time. It does this by generating a PSS time signal during initialization with the SSB offset given via command line. Then PSS detection is done by correlation.

In this commit, the UE computes a list of GSCN in the current NR band that falls within the current bandwidth for the set center frequency. For each GSCN in the list, the UE starts a thread and performs the following:

  1. Generate PSS time signal with SSB offset for current GSCN.
  2. Detect PSS, SSS and decode PBCH (this step remains the same). After all threads finishes, the results are collected.

For now, only the first detected PBCH is used to proceed further. So this PBCH is indicated to MAC and UE exits initial sync.

Future work: The cell search can be standalone feature where the UE could scan for SSB in the entire NR band. This would require changing radio's frequency on the fly as the UE's bandwidth would not cover an entire NR band. The cell detection can futher be imporved by looking for SIB1 for each decoded PBCH.

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