System-level terms — bands, duplexing, aggregation, and the loops
The remaining terms on the concept map are the ones that sit around the physical layer — which band it runs in, how the two directions share the air, how carriers combine, and the control loops that decide what happens next slot.
Concepts defined here. FR1 and FR2 · PAPR · TDD and FDD · Carrier aggregation · Scheduling · Link adaptation · DRX · eMBB, URLLC, mMTC · AI/ML in the RAN
EVM is in ref-modulation §5, where the constellation argument that needs it lives.
The concepts this note covers
Each concept now has a page of its own. This note is the narrative — the group read as one argument, with the connective tissue that a page-per-concept cannot carry. The pages are the definitions, and each one shows what to learn before it.
| Concept | What it is | Needs | Primary clause |
|---|---|---|---|
| AI/ML in the RAN | Learning inside the radio, and at what timescale | 2 | TS 38.214 §5.2.1.4.2, TR 38.843 |
| Carrier aggregation | Several carriers, one device | 2 | TS 38.101-1 §5.5, TS 38.213 §10 |
| DRX | Discontinuous reception — how a device sleeps | 2 | TS 38.321 §5.7 |
| FR1 and FR2 | The two frequency ranges, and why they behave differently | 0 | TS 38.101-1 §5.1, TS 38.101-2 §5.1 |
| Link adaptation | Choosing a rate the link will actually carry | 2 | TS 38.214 §5.1.3, §5.2.2.1 |
| PAPR | Peak-to-average power ratio | 1 | TS 38.211 §6.3.1.4 |
| Scheduling | Who gets the grid, this slot | 2 | TS 38.213 §10, TS 38.321 §5.4 |
| TDD and FDD | Sharing a frequency in time, or using two | 2 | TS 38.213 §11.1 |
| URLLC and eMBB | The service classes, as configurations | 3 | TR 38.913 §7.5, §7.9 |
Which to read. Come here to see how these ideas hang together; go to a term page when you want one definition, its prerequisites, and everything that depends on it. The concept map indexes all 118, and its hierarchy puts them in learning order.
Sources
| Document | Clause | What it gives |
|---|---|---|
| TS 38.101-1 | 5.1, 5.5, 6.4.2 | Table 5.1-1, the frequency range definitions; band combinations and MSD; EVM |
| TS 38.211 | 4.5 | Carrier aggregation — the one-sentence design |
| 6.3.1.4 | DFT-spread OFDM, the low-PAPR uplink waveform | |
| TS 38.213 | 11.1 | TDD slot configuration and the slot format |
| 10.1, 10.2 | PDCCH monitoring; validation of SPS activation | |
| TS 38.214 | 5.1.3, 5.2.2.1 | The MCS and CQI tables link adaptation moves between |
| 5.2.1.4.2, 5.2.2.2.10–.11 | csi-InferencePrediction-r19 and the predicted-PMI codebooks | |
| TS 38.321 | 5.4 | Logical channel prioritisation — the device's own scheduling |
| 5.7 | DRX and its timers | |
| TR 38.913 | 7.1, 7.5, 7.6, 7.9–7.11 | The targets of Table 1 |