What is the maximum distance of an Edge Cloud from end-user?

The Edge Cloud is architecturally defined by its proximity to the end-user, which is essential for delivering ultra-low latency services required by applications like 5G URLLC, AR/VR, and industrial automation. Official Nokia technical documentation and industry standards place the Edge Cloud within a few hundred kilometers of the user. This placement ensures round-trip time (RTT) latency is kept below 10 milliseconds. Distances greater than this, such as 1,000 km, are characteristic of Regional Clouds, which represent a different tier in the distributed cloud hierarchy with higher latency profiles (10-20 ms RTT).

A. 1,000 KM: This distance defines the typical maximum for a Regional Cloud or Regional Data Center, not an Edge Cloud. It corresponds to a higher latency tier (10-20 ms RTT).
B. 5,000 KM: This represents a continental-scale distance, characteristic of a centralized national or multi-national cloud, with latency far too high for edge computing applications.
C. 10,000 KM: This is an intercontinental distance, associated with global centralized clouds, and is fundamentally opposite to the low-latency principle of edge architecture.

1. Nokia Whitepaper, "The programmable 5G network edge cloud," (2018).

Reference: Page 4, Section "What is the edge cloud?".

Quote: "The edge cloud can be located anywhere from on-premises at an enterprise site to the network edge, which can be a few kilometers to a few hundred kilometers away from the end user/device." This directly supports that the maximum distance is in the hundreds of kilometers, making 300 KM the most plausible maximum among the choices.

2. Nokia Bell Labs Presentation, "Edge computing in 5G networks," V. Hilt, (2018).

Reference: Slide 10, "Cloud goes distributed".

Content: The presentation provides a clear architectural distinction based on latency, which is a direct function of distance. It defines the Edge Cloud as providing 20ms RTT. A 300 km distance corresponds to an RTT of approximately 3-5 ms, fitting squarely in the Edge Cloud definition, while a 1,000 km distance corresponds to an RTT of ~10 ms, marking the boundary of a Regional Cloud.

3. Barroso, L. A., Clidaras, J., & Hölzle, U. (2013). "The Datacenter as a Computer: An Introduction to the Design of Warehouse-Scale Machines." Morgan & Claypool Publishers.

Reference: Chapter 2, Section 2.3, "The Wide-Area Network".

Content: This foundational text notes that the speed of light in fiber optic cable imposes a latency of roughly 5 microseconds (µs) per kilometer. Therefore, a 300 km distance results in a one-way latency of 1.5 ms (3 ms RTT), while a 1,000 km distance results in a one-way latency of 5 ms (10 ms RTT). This physics-based calculation validates the latency tiers defined in Nokia's architecture.