5G C-RAN (Centralized/Cloud RAN) and CP (Control Plane) and UP (User Plane) Separation

  • A gNB may consist of a gNB-CU-CP, multiple gNB-CU-UPs and multiple gNB-DUs;

  • One gNB-DU is connected to only one gNB-CU-CP;

  • One gNB-CU-UP is connected to only one gNB-CU-CP;

  • One gNB-DU can be connected to multiple gNB-CU-UPs under the control of the same gNB-CU-CP;

  • One gNB-CU-UP can be connected to multiple DUs under the control of the same gNB-CU-CP;

  • Here I try to depict the functional split of RNL(Layer 2) between gNB-CU and gNB-DU based on 3GPP specification.

LinkedIn: Rahim Navaei on LinkedIn: #5g #5gnr #4g

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๐—ก๐—ฒ๐—ฒ๐—ฑ ๐—ผ๐—ณ ๐—ฆ๐—ฒ๐—ฝ๐—ฎ๐—ฟ๐—ฎ๐˜๐—ฒ ๐—จ๐˜€๐—ฒ๐—ฟ ๐—ฎ๐—ป๐—ฑ ๐—–๐—ผ๐—ป๐˜๐—ฟ๐—ผ๐—น ๐—ฃ๐—น๐—ฎ๐—ป๐—ฒ ๐—ถ๐—ป ๐Ÿฑ๐—š

:point_right:๐˜ฟ๐™ž๐™›๐™›๐™š๐™ง๐™š๐™ฃ๐™ฉ ๐™ฉ๐™ฎ๐™ฅ๐™š ๐™ค๐™› ๐˜ฟ๐™š๐™ซ๐™ž๐™˜๐™š๐™จ

  • MMTC devices needs very less amount of Data but use equivalent amount of Signaling , We need to scale Signaling Infrastructure for such devices

  • eMBB devices consumes lots of Data , We need to Scale User Plane Infrastructure for such devices

  • No Separation of Control and Signaling Plane would lead to scaling up overall capacity of Node for both User and Control plane which is wastage & Inefficient way to scale capacity

:point_right:๐™‡๐™–๐™ฉ๐™š๐™ฃ๐™˜๐™ฎ ๐™๐™š๐™ฆ๐™ช๐™ž๐™ง๐™š๐™ข๐™š๐™ฃ๐™ฉ๐™จ

  • Latency Sensitive Applications needs user plane to be situated Geographically near to users ( Regional , Local or Zonal Deployment of User plane capacities ) , While control plane Nodes can deployed centrally at one location for easy maintenance , operations & administration

  • This will also help us to save Media / Transmission costs also

:point_right:๐˜ผ๐™™๐™ซ๐™–๐™ฃ๐™ฉ๐™–๐™œ๐™š๐™จ ๐™ค๐™› ๐˜พ๐™๐™‹๐™Ž

  • Reducing Latency on User Plane

  • Support Rapid Increase of Data Traffic

  • Better Administration and Operational Control

  • Better Integration with SDN

  • Minimizing Wastage of Unused capacity

Credits: :point_down: