  Network slicing has been advocated by both academia and industry as a
cost-efficient way to enable operators to provide networks on an as-a-service
basis and meet the wide range of use cases that the fifth generation wireless
network will serve. The existing works on network slicing are mainly targeted
at the partition of the core network, and the prospect of network slicing in
radio access networks should be jointly exploited. To solve this challenge, an
enhanced network slicing in fog radio access networks (F-RANs), termed as
access slicing, is proposed. This article comprehensively presents a novel
architecture and related key techniques for access slicing in F-RANs. The
proposed hierarchical architecture of access slicing consists of centralized
orchestration layer and slice instance layer, which makes the access slicing
adaptively implement in an convenient way. Meanwhile, key techniques and their
corresponding solutions, including the radio and cache resource management, as
well as the social-aware slicing, are presented. Open issues in terms of
standardization developments and field trials are identified.
