3GPP Release 15

Release 15 established what most people mean by "5G" at its most basic level — a new radio air interface (NR) capable of higher throughput and lower latency than 4G, paired with a redesigned core network architecture supporting network slicing. Equipment and networks claiming any 5G capability implement at minimum a subset of Release 15, with every later release (16, 17, 18, 19) building additively on this foundation rather than replacing it.

The historically significant design choice in Release 15 was supporting both non-standalone and standalone deployment options, which let operators launch commercial 5G service quickly by initially running 5G radio access on their existing 4G core network infrastructure (non-standalone), deferring the more disruptive full 5G core network buildout (standalone) until later — a pragmatic sequencing decision that shaped how 5G actually rolled out commercially far more than the underlying radio technology capability did. This baseline-and-extend pattern established in Release 15 is also what makes tracking "which release" a device or network implements operationally meaningful throughout this corpus: a Release 15-only network has none of the NTN, enhanced mobility, or RedCap capability that Releases 17 through 19 later added, regardless of how capable its Release 15 feature set is on its own terms. For CE verticals, Release 15 is largely a historical reference point rather than an active procurement consideration today — current NTN and IoT-relevant 5G deployments require Release 17 or later specifically, but understanding Release 15 as the foundational baseline clarifies why later releases are described as building on rather than replacing what came before.