Describe the functions of the Network Slice Subnet Instance (NSSI) in the 5G Core network.
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Slice Instance Management:
Creation and Configuration: NSSI is responsible for creating and configuring instances of network slices based on the specific requirements of the service or use case. It takes into account factors such as latency, throughput, and reliability to define the characteristics of the slice.
Dynamic Adjustment: NSSI allows for dynamic adjustments of slice instances, enabling the network to adapt to changing conditions, demands, or priorities. This ensures efficient resource utilization and optimal performance for each slice.
Resource Allocation and Orchestration:
Resource Allocation: NSSI manages the allocation of physical and virtual resources to the respective network slices. This involves assigning computing, storage, and network resources according to the slice's requirements, ensuring that each slice gets the necessary resources to meet its performance objectives.
Orchestration: NSSI works in coordination with the orchestration functions in the 5G Core network to automate the deployment and configuration of network slice instances. Orchestration involves the seamless integration of various network functions and resources to create a functional and isolated slice.
Quality of Service (QoS) Management:
QoS Parameters: NSSI defines and enforces Quality of Service parameters for each network slice, including parameters related to latency, reliability, and throughput. This ensures that the slice delivers the required performance characteristics to meet the specific needs of the applications or services it serves.
Monitoring and Optimization: NSSI continuously monitors the performance of each slice, making real-time adjustments to maintain the defined QoS levels. This involves optimizing resource allocation and configuration to adapt to changing network conditions or service requirements.
Security and Isolation:
Security Configuration: NSSI implements security measures to ensure the isolation and integrity of each network slice. This involves setting up security protocols, authentication mechanisms, and encryption to protect the communication within and across slices.
Isolation: NSSI ensures that the resources allocated to one network slice are isolated from resources allocated to other slices, preventing interference and unauthorized access. This is crucial for maintaining the integrity and security of each slice.
Service Exposure and Connectivity:
Connectivity Establishment: NSSI facilitates the establishment of connectivity within and between network slices. It ensures that communication paths are established based on the slice's connectivity requirements, enabling seamless communication between devices and applications within the slice.
Service Exposure: NSSI provides mechanisms for exposing services and applications within a network slice to external entities. This may involve defining interfaces, APIs, and connectivity points to enable interaction with services hosted in the slice.
