Huawei NICT China Mobile Huawei Huawei University College London Hickory Hill Consulting Orange This document presents network slicing differentiation from the non- partition network or from simply partition of connectivity resources. It lists 7 standardization gaps related to 4 key requirements for network slicing in transport network. It also presents an analysis of existing related work and other potential solutions on network slicing. This gap analysis document aims to provide a basis for future works in transport network slicing.