Telecom Techniques Guide


What is the difference between en-DC and NE-DC?

En-DC (E-UTRA-NR Dual Connectivity) and NE-DC (NR-Only Dual Connectivity) are two important concepts in the world of wireless communication, specifically in the context of 5G networks. These technologies are designed to enhance network performance, capacity, and reliability by combining different generations of cellular technologies. In this detailed explanation, we will delve into the differences between En-DC and NE-DC, exploring their key features, use cases, and benefits.

What is the difference between en-DC and NE-DC?

1. En-DC (E-UTRA-NR Dual Connectivity):

En-DC, which stands for E-UTRA-NR Dual Connectivity, is a network architecture that combines both LTE (Long-Term Evolution) and 5G NR (New Radio) technologies. This approach is part of the 5G non-standalone (NSA) deployment, where 5G NR is supported by an existing LTE network. Here are the key details of En-DC:

  • Dual Connectivity: En-DC allows a device to connect to both LTE and 5G NR simultaneously. This dual connectivity enables several advantages, including improved data rates, reduced latency, and seamless mobility.
  • Data Aggregation: One of the primary benefits of En-DC is data aggregation. It combines the data throughput capabilities of LTE and 5G NR, resulting in significantly higher download and upload speeds. This is particularly beneficial for applications that require high data rates, such as 4K video streaming and augmented reality.
  • Enhanced Mobility: En-DC provides improved mobility support, ensuring that devices can smoothly transition between LTE and 5G NR networks as needed. This is crucial for maintaining a consistent connection quality while on the move.
  • Load Balancing: En-DC also supports load balancing between LTE and 5G NR. This means that network operators can optimize the utilization of both network technologies based on traffic conditions and user demand, leading to better network efficiency.
  • Fallback Mechanism: En-DC includes a fallback mechanism, which allows devices to continue communication over LTE if the 5G NR signal becomes weak or unavailable. This ensures uninterrupted service even in areas with limited 5G coverage.
  • Energy Efficiency: En-DC can be designed to be energy-efficient. Devices can intelligently switch between LTE and 5G NR based on factors like signal strength and data requirements, conserving battery life.

2. NE-DC (NR-Only Dual Connectivity):

NE-DC, or NR-Only Dual Connectivity, is another approach to dual connectivity in 5G networks. However, it differs from En-DC in a fundamental way. NE-DC involves the simultaneous connection of a device to two 5G NR carriers, rather than combining LTE and 5G NR. Here’s a detailed look at NE-DC:

  • 5G NR Exclusive: In NE-DC, both primary and secondary connections are established through 5G NR carriers. This means that the device does not rely on LTE at all, making it a more advanced and future-oriented approach compared to En-DC.
  • Higher Data Rates: NE-DC can provide even higher data rates compared to En-DC because it leverages the full capabilities of 5G NR. This makes it suitable for applications that demand ultra-fast speeds, such as virtual reality and real-time 8K video streaming.
  • Low Latency: NE-DC minimizes latency by maintaining both connections within the 5G NR ecosystem. Low latency is crucial for applications like autonomous vehicles and remote surgery, where real-time responsiveness is essential.
  • Spectrum Efficiency: NE-DC is highly spectrum-efficient because it utilizes two 5G NR carriers. This makes it a preferred choice for network operators looking to maximize the use of their available spectrum resources.
  • Simplified Network Architecture: Compared to En-DC, which involves the coexistence of LTE and 5G NR cores, NE-DC’s exclusive use of 5G NR simplifies the network architecture, potentially reducing operational complexity and costs for operators.
  • Future-Proofing: NE-DC is seen as a future-proofing strategy as it focuses exclusively on the latest generation of cellular technology (5G NR). This makes it well-suited for networks that aim to transition away from older technologies like 4G LTE.

Differences Between En-DC and NE-DC:

Now that we’ve discussed En-DC and NE-DC in detail, let’s summarize the key differences between the two technologies:

Technology Mix:

  • En-DC combines LTE and 5G NR.
  • NE-DC exclusively relies on 5G NR.

Data Aggregation:

  • En-DC aggregates data from LTE and 5G NR.
  • NE-DC aggregates data from two 5G NR carriers.


  • En-DC may have slightly higher latency due to LTE involvement.
  • NE-DC minimizes latency by using only 5G NR.

Spectrum Usage:

  • En-DC uses LTE and 5G NR spectrum.
  • NE-DC efficiently utilizes 5G NR spectrum.


  • En-DC’s network architecture is more complex due to the coexistence of LTE and 5G NR cores.
  • NE-DC simplifies the network architecture by relying solely on 5G NR.


  • En-DC is a transitional technology, still dependent on LTE.
  • NE-DC is a forward-looking strategy that embraces 5G NR exclusively.

Use Cases and Applications:

The choice between En-DC and NE-DC depends on various factors, including the operator’s network strategy and the specific use cases they aim to support:

En-DC Use Cases:

  • En-DC is well-suited for networks in transition from LTE to 5G NR.
  • It can benefit applications like enhanced mobile broadband (eMBB) and IoT deployments.

NE-DC Use Cases:

  • NE-DC is ideal for networks focused on maximizing 5G NR’s capabilities.
  • It is suitable for ultra-high-speed applications, low-latency scenarios, and mission-critical communications.

In conclusion, both En-DC and NE-DC are important dual connectivity techniques in the realm of 5G networks, offering distinct advantages and use cases. En-DC bridges the gap between LTE and 5G NR, making it a transitional solution, while NE-DC fully embraces the capabilities of 5G NR for future-proofing network infrastructure. The choice between these technologies depends on the operator’s network strategy and the specific requirements of the applications they intend to support.

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