tokens: ['As', 'per', 'TS', '', '', 'description', 'of', 'NSaaS', 'the', 'Network', 'Slice', 'is', 'considered', 'as', 'a', 'Communication', 'Service', 'offered', 'by', 'a', 'CSP', 'to', 'a', 'CSC', 'The', 'CSP', 'is', 'the', 'network', 'slice', 'provider', 'NSaaS', 'provider', 'the', 'CSC', 'is', 'the', 'network', 'slice', 'customer', 'NSaaS', 'consumer', 'The', 'CSC', 'is', 'authorized', 'by', 'the', 'CSP', 'for', 'operations', 'on', 'NSI', 'in', 'commissioning', 'phaseOperation', 'phase', 'Decommissioning', 'phase', 'The', 'CSP', 'collects', 'charging', 'information', 'for', 'the', 'different', 'operations', 'performed', 'by', 'the', 'CSC', 'on', 'Network', 'Slices', 'The', 'potential', 'charging', 'requirements', 'for', 'this', 'Use', 'Case', 'are', 'REQCHNSIMNG', 'REQCHNSIMNG']