Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2

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**What the scope covers** TS 36.300 provides an overview and overall description of the E-UTRAN radio interface protocol architecture. It serves as a Stage 2 architectural reference for E-UTRA and E-UTRAN, sitting above the detailed protocol specifications found elsewhere in the 36-series. For Multi-Connectivity scenarios involving E-UTRAN, the specification explicitly defers delta behavior to TS 37.340. **When a RAN/core engineer would open it** An engineer would reference this document when needing an authoritative architectural starting point for E-UTRAN — for example, when understanding how the radio interface protocol layers are structured before diving into the detailed 36-series companion specs. It is also the natural first stop when scoping an E-UTRAN deployment or integration and determining which detailed specifications govern each protocol layer. Engineers working on Multi-Connectivity would use it to establish the E-UTRA baseline before cross-referencing TS 37.340 for the divergences.

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