A Flexible Network Architecture for 5G Systems

Table 1

List of gaps identified from multiple sources.

Gap	Description
GAP #1	Inter-dependencies between Network Functions co-located in the same node
GAP #2	Orchestration-driven elasticity not supported
GAP #3	Fixed functional operation of small cells
GAP #4	Need for support for computational offloading
GAP #5	Need for support for telco grade performance (e.g. low latency, high performance, scalability)
GAP #6	E2E cross-slice optimisation not fully supported
GAP #7	Lack of experiment-based E2E resource management for VNFs
GAP #8	Lack of a refined 5G security architecture design
GAP #9	Lack of a self-adaptive and slice-aware model for security
GAP #10	Need for enhanced and inherent support for RAN reliability
GAP #11	Indirect and rudimentary support of telco cloud resilience mainly through management and control mechanisms
GAP #12	Need for (radio) resource sharing strategy for network slices