5G Architecture with interfaces
5G Architecture with Interfaces: A Deep Dive
The fifth generation of mobile networks, 5G, represents a significant leap from its predecessors, offering ultra-fast speeds, low latency, and massive device connectivity. But what powers this revolution under the hood? The answer lies in the 5G architecture — a modern, service-based, and flexible design that can adapt to a wide variety of use cases, from smart cities to autonomous vehicles.
In this blog, we’ll explore the components of 5G architecture, its key functions, and the interfaces that connect them.
What is 5G Architecture?
5G architecture is a highly modular and virtualized system designed to meet the diverse requirements of enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable low-latency communication (URLLC).
It is broadly divided into two main parts:
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- 5G Access Network (5G-AN or NG-RAN)
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- 5G Core Network (5GC)
Components of 5G Architecture
1. User Equipment (UE)
These are the end devices (like smartphones, IoT devices) that connect to the network.
2. Next-Generation Radio Access Network (NG-RAN)
Responsible for radio communication between the UE and the core network. It includes:
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- gNB (gNodeB) – The 5G base station
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- CU (Central Unit) – Handles non-real-time protocols
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- DU (Distributed Unit) – Handles real-time protocols and scheduling
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- gNB (gNodeB) – The 5G base station
3. 5G Core Network (5GC)
A fully cloud-native and service-based architecture. Key components include:
| Component | Function |
|---|---|
| AMF (Access and Mobility Management Function) | Handles registration, connection, and mobility management |
| SMF (Session Management Function) | Manages sessions and IP address allocation |
| UPF (User Plane Function) | Handles user data transfer (user plane) |
| PCF (Policy Control Function) | Manages QoS and policy rules |
| AUSF (Authentication Server Function) | Authenticates users |
| UDM (Unified Data Management) | Stores subscriber data |
| NEF (Network Exposure Function) | Exposes network capabilities to third parties |
| NSSF (Network Slice Selection Function) | Selects appropriate network slice for users |
5G Interfaces Explained
Interfaces connect various components within the 5G architecture. These can be control plane interfaces or user plane interfaces. Here’s a breakdown:
🌐 Radio Access Network Interfaces
| Interface | Description |
|---|---|
| NG Interface (NG-C / NG-U) | Connects gNB to 5G Core; NG-C is for control plane, NG-U is for user plane |
| Xn Interface | Connects two gNBs for mobility management and handover |
| F1 Interface (F1-C / F1-U) | Connects gNB-CU and gNB-DU; F1-C is control, F1-U is user data |
| E1 Interface | Connects different functional units within the gNB |
Core Network Interfaces
| Interface | Between | Purpose |
|---|---|---|
| N1 | UE ↔ AMF | NAS signaling (registration, authentication) |
| N2 | AMF ↔ gNB | Control plane between RAN and Core |
| N3 | UPF ↔ gNB | User data transfer |
| N4 | SMF ↔ UPF | Control of user plane sessions |
| N5 | PCF ↔ AMF | Policy information exchange |
| N6 | UPF ↔ Data Network | Interface to the internet or enterprise network |
| N8 | UDM ↔ AMF | Subscription and identity management |
| N10 | UDM ↔ SMF | Subscription data for session management |
| N11 | AMF ↔ SMF | Session and mobility coordination |
| N12 | AMF ↔ AUSF | Authentication |
| N13 | AMF ↔ NSSF | Network slice selection |
| N15 | AMF ↔ PCF | Policy control for mobility and session |
| N20 | NEF ↔ Other NFs | Exposure of network functions to external apps |
Key Features of 5G Architecture
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- Service-Based Architecture (SBA) – Core network elements communicate over REST APIs
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- Network Slicing – Multiple logical networks over a single physical network
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- Cloud-Native Design – Built to run on cloud infrastructure for scalability and agility
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- Separation of Control and User Plane – Enables independent scaling
5G SA vs NSA Architecture
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Standalone (SA): Entirely new 5G infrastructure with 5GC and gNodeB.
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Non-Standalone (NSA): Uses existing 4G LTE EPC core with new 5G RAN. Faster to deploy but not fully capable of all 5G features.
Benefits of 5G Architecture
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Network Slicing for different applications (e.g., gaming, IoT, remote surgery)
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Lower Latency for real-time communication
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Higher Bandwidth and data speeds
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Massive IoT Support with millions of devices per square kilometer
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Flexible Service Deployment using cloud-native technologies
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1 Comment
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