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LTE UE Category

Summary
  • Every LTE device declares a UE Category — or, since Release 12, separate ue-CategoryDL/ue-CategoryUL values — in its UE Capability Information RRC message.
  • A category is an upper bound on what the device can do (peak throughput, MIMO layers, modulation), not a guarantee of what it will get — a Cat 16 phone on a Cat 4 cell still only gets Cat 4 throughput.1
  • Defined in 3GPP TS 36.306.2

Think of a UE Category as:

"A spec sheet the device hands the network before anything else happens — here's the fastest I can possibly go, now don't expect more than that no matter how good the radio conditions are."

Where these numbers come from

Downlink figures below are converted directly from the raw per-TTI bit values in TS 36.306's own category table.1 Uplink figures for Cat 9 and below are well-established, widely-corroborated numbers. For Cat 13 and above, and for NB-IoT, I leaned on secondary sources rather than the raw spec table itself — treat those as good-faith estimates, not spec-verified figures, if precision matters for your use case.

IoT-Focused Categories

Category Peak DL Peak UL Layers Notes
Cat NB1 Tens to ~170 kbps Up to ~250 kbps 1 NB-IoT baseline (Release 13), 180 kHz bandwidth
Cat NB2 Roughly 2× NB1 Roughly 2× NB1 1 NB-IoT enhancement (Release 14)
Cat M1 1.0 Mbps 1.0 Mbps 1 eMTC baseline (Release 13), 1.08 MHz bandwidth
Cat M2 4.0 Mbps ~7 Mbps 1 eMTC enhancement (Release 14), wider 5 MHz option
Cat 0 1.0 Mbps 1.0 Mbps 1 First low-cost MTC category (Release 12), predecessor to Cat-M1
Cat 1bis 10.3 Mbps 5.2 Mbps 1 Same PHY rate as Cat 1, but with a single Rx antenna — a cost-reduced Cat 1 variant (Release 13)

Table 1. IoT-Focused Categories

This connects to RedCap

Cat-1, Cat-M1, and NB-IoT are exactly the LTE-era device classes RedCap is positioned relative to — RedCap sits above this tier, and eRedCap specifically targets closing the gap between this tier and RedCap proper.

Baseline Categories (Release 8/10)

Category Peak DL Peak UL Layers
Cat 1 10.3 Mbps 5.2 Mbps 1
Cat 2 51.0 Mbps 25.5 Mbps 1
Cat 3 102.0 Mbps 51.0 Mbps 2
Cat 4 150.8 Mbps 51.0 Mbps 2
Cat 5 299.6 Mbps 75.4 Mbps 4
Cat 6 301.5 Mbps 51.0 Mbps 2 or 4
Cat 7 301.5 Mbps 102.0 Mbps 2 or 4
Cat 8 2,998.6 Mbps 1,497.8 Mbps 8

Table 2. Baseline Categories (Release 8/10)

Cat 4 became the de facto entry-level smartphone/router tier for years; Cat 6 was the first category built around Carrier Aggregation rather than a single wider carrier — same DL peak as Cat 4 in one sense, achieved a completely different way (two aggregated 20 MHz carriers instead of one).

LTE-Advanced Pro Categories (CA, higher-order MIMO, 256-QAM)

Category Peak DL Peak UL Layers
Cat 9 452.3 Mbps 51.0 Mbps 2 or 4
Cat 10 452.3 Mbps 102.0 Mbps 2 or 4
Cat 11 603.0 Mbps 51.0 Mbps 2 or 4
Cat 12 603.0 Mbps 102.0 Mbps 2 or 4
Cat 13 391.6 Mbps ~150 Mbps 2 or 4
Cat 14 ~3,916.6 Mbps ~150 Mbps 8
Cat 15 ~750–808 Mbps ~226 Mbps 2 or 4
Cat 16 ~979–1,051 Mbps ~150 Mbps 2 or 4
Cat 17 ~25,066 Mbps — 8
Cat 18 ~1,175–1,212 Mbps ~211 Mbps 2, 4, or 8
Cat 19 ~1,566–1,658 Mbps ~226 Mbps 2, 4, or 8
Cat 20 ~1,948–2,019 Mbps 315.0 Mbps 2, 4, or 8

Table 3. LTE-Advanced Pro Categories

These are ceilings, not deployment reality

Several of these — Cat 14 and Cat 17 in particular — represent theoretical maximums under massive Carrier Aggregation and 8-layer MIMO configurations that essentially never exist in commercial deployment.1 Cat 16 ("Gigabit LTE") and Cat 18–20 are the ones that actually shipped in real flagship devices and networks.

Useful Resources

  • 3GPP TS 36.306 — UE radio access capabilities, including every UE Category definition
  • ShareTechnote — LTE-Advanced UE Category — the source for the raw per-category spec tables used above

  1. Ryu, J. (n.d.). 4G/LTE – LTE Advanced: UE Category for PHY layer throughput. ShareTechnote. https://www.sharetechnote.com/html/LTE_Advanced_UE_Category.html ↩↩↩

  2. 3GPP. (n.d.). User Equipment (UE) radio access capabilities (Technical Specification TS 36.306). 3rd Generation Partnership Project. https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=2418 ↩