tokens: ['Mobility', 'Robustness', 'Optimisation', 'aims', 'at', 'detecting', 'and', 'enabling', 'correction', 'of', 'following', 'problems', '', 'Connection', 'failure', 'due', 'to', 'intrasystem', 'or', 'intersystem', 'mobility', '', 'Intersystem', 'Unnecessary', 'HO', 'too', 'early', 'intersystem', 'HO', 'from', 'NR', 'to', 'EUTRAN', 'with', 'no', 'radio', 'link', 'failure', '', 'Intersystem', 'HO', 'pingpong', '', 'PSCell', 'change', 'failure', '', 'Intersystem', 'voice', 'fallback', 'failure', '', 'Fast', 'MCG', 'recovery', 'failure', 'MRO', 'provides', 'means', 'to', 'distinguish', 'the', 'above', 'problems', 'from', 'NR', 'coverage', 'related', 'problems', 'and', 'other', 'problems', 'not', 'related', 'to', 'mobility', 'For', 'detection', 'of', 'a', 'suboptimal', 'successful', 'handovers', 'MRO', 'additionally', 'enables', 'observability', 'of', '', 'Successful', 'HO', 'due', 'to', 'intraNR', 'mobility', '', 'Successful', 'HO', 'due', 'to', 'interRAT', 'mobility', 'For', 'detection', 'of', 'a', 'suboptimal', 'successful', 'PSCell', 'additionchange', 'MRO', 'additionally', 'enables', 'observability', 'of', '', 'Successful', 'PSCell', 'additionchange']