5G NR frame structure – not all slots are equal
Many online resources oversimplify how slot length works in 5G NR. This article explains what the 3GPP specification actually says — and why it matters.
The frame structure in 5G NR organises data scheduling between UEs and the network in a predictable way, while still allowing flexible, per-user scheduling. The basic idea is inherited from LTE: radio frames are 10 ms long and divided into subframes, slots, and symbols. Each symbol consists of a cyclic prefix (CP) followed by the useful sequence.
However, 5G NR introduces the concept of numerologies, which provide flexibility in how symbols are organised in both time and frequency — including different subcarrier spacings (SCS) and numbers of slots per subframe. LTE, by contrast, only supports 15 kHz SCS with two slots per subframe. One could describe LTE as using a fixed numerology, although the term itself was introduced with 5G NR.
The high-level impact of numerologies on the frame structure is fairly well covered across online resources. However, there is a recurring and significant oversimplification in how different numerologies affect slot length. This article clarifies how slot length actually works in 5G NR, based directly on the 3GPP specification.
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