5G networks must meet diversified demands. ITU classified 5G mobile network services into three categories: Enhanced Mobile Broadband(eMBB), Ultra-reliable and Low-latency Communications (uRLLC), and Massive Machine Type Communications (mMTC).
- eMBB focuses on services that have bandwidth high requirements, such as high definition (HD) videos, virtual reality (VR), and augmented reality (AR).
- uRLLC focuses on latency-sensitive services, such as assisted and automated driving, and remote management.
- mMTC focuses on services that include connection density high requirements, such as smart city and smart agriculture.
5G Network Slicing
E2E network slicing is a cornerstone to support versatile 5G services.
Based on NFV and SDN, the physical infrastructure of the future network architecture consists of sites and three-layer Data Centers.
Sites support multiple modes such as 5G, LTE, and Wi-Fi to implement the RAN real-time function. These functions have high needs for calculating capability and real-time performance and need specific hardware.
Three-layer cloud DC includes:
1- The bottom layer is the central office of DC, which is closest in relative proximity to the base station side.
2- The second layer is the local DC.
3- The upper layer is the regional DC.
For each corresponding service type, networks generate corresponding network topologies and a series of network slices using NFV on a physical infrastructure.
Each network slice is derived from a unified physical network infrastructure, which reduces subsequent operators’ network Capex.
Network slices have a logical arrangement and are separated as individual structures. This allows heavily customizable service functions and independent O&M.