What are the events 1a, 1b, 1c, etc.?

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 e1a – a Primary CPICH enters the reporting range, i.e. add a cell to active set.
 e1b – a primary CPICH leaves the reporting range, i.e. removed a cell from active set.
 e1c – a non-active primary CPICH becomes better than an active primary CPICH, i.e. replace a cell.
 e1d: change of best cell.
 e1e: a Primary CPICH becomes better than an absolute threshold.
 e1f: a Primary CPICH becomes worse than an absolute threshold.

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