5G Identifiers, 5G Security aspects, Support for Dual Connectivity, Multi-Connectivity, Charging, Network slicing and Network Sharing
In the 5G System, one 5G Subscription Permanent Identifier (SUPI) shall be allocated to each subscriber that can be used within the 3GPP system. The subscriptions identification is supported by the 5G system, independent of UE identification. A Permanent Equipment Identifier (PEI) shall be assigned to each UE that can access the 5G system. A temporary identifier, 5G-GUTI, is allocated so that user confidentiality protection can be supported by the 5G system.
5G Security aspects
The 5G System includes the following security features, such as:
- UE authentication by the network
- Generation and distribution of security context
- Confidentiality and integrity protection of user plane data
- Confidentiality and integrity protection of control plane signalling
- Confidentiality of identity of user
- LI requirements support
Support for Dual Connectivity, Multi-Connectivity
The two radio network nodes are involved in Dual Connectivity to provide radio resources to a given UE. All necessary N2 related functions are performed by the RAN node where the N2 terminates. If Mobility Restriction is there in UE, these restrictions are signalled by the AMF as Mobility Restriction List to the Master RAN Node.
The charging information collection and reporting is supported by the 5GC for network resource usage. The interactions towards the charging system are supported by the SMF. The functionality of collecting and reporting the usage data to SMF is supported by the UPF. The SMF control to collect and report the usage data of the UPF is supported by the N4 reference point.
Support for Edge Computing
The operator and 3rd party services are enabled to host closer to the access point of attachment of UE by edge computing so that efficient service delivery can be achieved through the reduced end-to-end latency and load on the transport network. a UPF close to the UE can be selected by the CN of 5G and the traffic steering has been executed from the UPF to the local Data Network via a N6 interface on the basis of subscription data and location of UE, and the information from Application Function (AF). one or a combination of the following enablers support the edge computing:
- Re-selection of user plane
- Local Routing and Traffic Steering
- Session and service continuity
- Network capability exposure
- QoS and Charging
- Local Area Data Network support
a PLMN has a defined Network Slice that shall include:
- the Core Network Control Plane and User Plane Network Functions
- the NG Radio Access Network
- the N3IWF functions to the non-3GPP Access Network
multiple participating operators shall be allowed by the architecture of a network sharing so that resources of a single shared network are shared according to agreed allocation schemes. a radio access network is included in the shared network. radio resources are included in the shared resources. shared resources to the participating operators are allocated by the operator of shared network on the basis of their planned and current needs and according to service level agreements.
Control Plane Load Control, Congestion and Overload Control
Under normal capacity, there operates the network functions within 5G System to provide connectivity and necessary services to the UE. the various measures are supported by it to guard itself. load re-balancing, overload control and NAS level congestion control are supported by it.