tokens: ['operator', 'in', 'choosing', 'their', 'antenna', 'suppliers', 'a', 'new', 'interface', 'is', 'required', 'between', 'RET', 'antenna', 'and', 'Node', 'B', 'to', 'control', 'the', 'electrical', 'tilting', 'Additionally', 'RET', 'functionality', 'in', 'the', 'UTRAN', 'accompanied', 'by', 'an', 'appropriate', 'set', 'of', 'signalling', 'commands', 'and', 'control', 'parameters', 'from', 'the', 'Network', 'Manager', 'over', 'the', 'IftN', 'interface', 'would', 'allow', 'the', 'operator', 'to', 'optimise', 'the', 'whole', 'network', 'using', 'consistent', 'commands', '', 'even', 'in', 'a', 'multivendor', 'environment', 'TSG', 'SA', 'WG', '', 'should', 'provide', 'the', 'parameters', 'and', 'functionality', 'across', 'the', 'ItfN', 'interface', 'needed', 'for', 'a', 'network', 'wide', 'controlling', 'of', 'RET', 'antenna', 'devices', 'For', 'this', 'purpose', 'a', 'TSG', 'SA', 'WG', '', 'Work', 'Item', 'on', 'RET', '', 'was', 'approved', 'at', 'SA', 'and', 'TR', '', '', 'captures', 'the', 'requirements', 'for', 'this', 'work']