Why Network Slicing Is Important for 5G?


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).

  1. eMBB focuses on services that have bandwidth high requirements, such as high definition (HD) videos, virtual reality (VR), and augmented reality (AR).
  2. uRLLC focuses on latency-sensitive services, such as assisted and automated driving, and remote management.
  3. 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- T
he 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.

Source: Huawei