The present disclosure provides an apparatus for network slicing, and an apparatus for network slice management, which are usable to support and optimize multi-slice services. The apparatuses provide functional enhancements within different layers of a network architecture. The apparatus for network slicing is configured to determine at least two correlated communication traffic flows for a service, and to bind the at least two correlated communication traffic flows. Further, it is configured to generate, and preferably expose, binding information. The apparatus for network slice management is configured to convert a service requirement of a tenant/application into a joint performance parameter in correlated network slice instances. Further, it is configured to determine a resource allocation for at least one of the network slice instances based on the joint performance parameter.