3GPP Spec Helper
Search the most-referenced 3GPP TS specifications across the 22, 23, 24, 29, 33, 36, 37 and 38 series. One click takes you to the live spec status on 3gpp.org — no account, no paywall.
Showing 59 of 59 specifications.
TS 22.101
Series 22Service aspects; Service principles
Top-level service principles for 3GPP networks.
Open on 3gpp.org
TS 22.261
Series 22Service requirements for the 5G system
Master list of 5G service and performance requirements (eMBB, URLLC, mMTC).
Open on 3gpp.org
TS 23.003
Series 23Numbering, addressing and identification
IMSI, SUPI, GUTI, GPSI, PEI and PLMN formats.
Open on 3gpp.org
TS 23.008
Series 23Organization of subscriber data
HSS / UDM subscriber data model.
Open on 3gpp.org
TS 23.273
Series 235G System Location Services (LCS)
Positioning architecture: LMF, AMF, gNB roles.
Open on 3gpp.org
TS 23.288
Series 23Architecture enhancements for 5G System to support network data analytics services
NWDAF architecture and analytics consumers.
Open on 3gpp.org
TS 23.401
Series 23EPS architecture (EPC)
LTE / EPC reference architecture — MME, SGW, PGW, HSS.
Open on 3gpp.org
TS 23.402
Series 23Architecture enhancements for non-3GPP accesses
Wi-Fi, untrusted and trusted non-3GPP access to EPC / 5GC.
Open on 3gpp.org
TS 23.501
Series 23System architecture for the 5G System (5GS)
5GC reference architecture, NFs, reference points and 5QI table.
Open on 3gpp.org
TS 23.502
Series 23Procedures for the 5G System (5GS)
Registration, PDU session, handover, service request procedures.
Open on 3gpp.org
TS 23.503
Series 23Policy and charging control framework for the 5G System
PCF, SMF policy decisions, QoS and URSP rules.
Open on 3gpp.org
TS 24.008
Series 24Mobile radio interface Layer 3 specification — Core network protocols
Legacy 2G/3G NAS: MM, GMM, CC, SM.
Open on 3gpp.org
TS 24.011
Series 24Point-to-Point (PP) SMS support on mobile radio interface
SMS over NAS (CP / RP layers).
Open on 3gpp.org
TS 24.301
Series 24NAS protocol for EPS (LTE NAS)
EMM and ESM procedures for 4G.
Open on 3gpp.org
TS 24.501
Series 24NAS protocol for 5G System (5GS)
5GMM and 5GSM procedures, 5GS Mobile Identity IE (SUCI).
Open on 3gpp.org
TS 29.244
Series 29Interface between the control plane and the user plane nodes (PFCP)
PFCP protocol used on N4 (SMF↔UPF) and Sx (SGW-C↔SGW-U).
Open on 3gpp.org
TS 29.500
Series 295G System; Technical Realization of Service Based Architecture
HTTP/2 + JSON + OpenAPI framework for 5GC SBI.
Open on 3gpp.org
TS 29.501
Series 29Principles and Guidelines for Services Definition
SBI service definition conventions.
Open on 3gpp.org
TS 29.502
Series 29Session Management Services (Nsmf)
SMF SBI API — PDU session lifecycle.
Open on 3gpp.org
TS 29.503
Series 29Unified Data Management Services (Nudm)
UDM SBI API — subscriber data, SIDF.
Open on 3gpp.org
TS 29.512
Series 29Session Management Policy Control Service (Npcf_SMPolicyControl)
PCF policy API consumed by SMF.
Open on 3gpp.org
TS 29.518
Series 29Access and Mobility Management Services (Namf)
AMF SBI API — communication, event exposure, MT.
Open on 3gpp.org
TS 33.220
Series 33Generic Authentication Architecture (GAA); Generic Bootstrapping Architecture (GBA)
BSF-based bootstrapping for application-layer auth.
Open on 3gpp.org
TS 33.401
Series 333GPP System Architecture Evolution (SAE); Security architecture
LTE / EPS security — EPS-AKA, NAS/AS ciphering.
Open on 3gpp.org
TS 33.501
Series 33Security architecture and procedures for 5G System
5G-AKA, EAP-AKA′, SUCI concealment, N32 SEPP security.
Open on 3gpp.org
TS 36.211
Series 36LTE Physical channels and modulation
LTE PHY structure — RE grid, reference signals, modulation.
Open on 3gpp.org
TS 36.212
Series 36LTE Multiplexing and channel coding
LTE Turbo/convolutional coding, DCI formats.
Open on 3gpp.org
TS 36.213
Series 36LTE Physical layer procedures
LTE scheduling, HARQ, CQI/PMI/RI feedback.
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TS 36.300
Series 36E-UTRA and E-UTRAN; Overall description; Stage 2
LTE RAN overall architecture and functional split.
Open on 3gpp.org
TS 36.321
Series 36LTE MAC protocol specification
LTE MAC — logical channels, HARQ, DRX.
Open on 3gpp.org
TS 36.322
Series 36LTE RLC protocol specification
LTE RLC TM / UM / AM modes.
Open on 3gpp.org
TS 36.323
Series 36LTE PDCP protocol specification
LTE PDCP — header compression, ciphering, integrity.
Open on 3gpp.org
TS 36.331
Series 36LTE RRC protocol specification
LTE RRC messages, SIBs, measurement config.
Open on 3gpp.org
TS 36.413
Series 36LTE S1 Application Protocol (S1AP)
eNB ↔ MME signalling over S1.
Open on 3gpp.org
TS 36.423
Series 36LTE X2 Application Protocol (X2AP)
eNB ↔ eNB signalling over X2 (handover, load info).
Open on 3gpp.org
TS 37.340
Series 37Multi-connectivity; Overall description; Stage 2
NSA (EN-DC) and MR-DC architecture and procedures.
Open on 3gpp.org
TS 38.101-1
Series 38NR User Equipment (UE) radio transmission and reception; Part 1: Range 1 Standalone
FR1 UE RF requirements.
Open on 3gpp.org
TS 38.101-2
Series 38NR UE radio transmission and reception; Part 2: Range 2 Standalone
FR2 (mmWave) UE RF requirements.
Open on 3gpp.org
TS 38.104
Series 38NR Base Station (BS) radio transmission and reception
gNB RF requirements, NR-ARFCN tables, channel rasters.
Open on 3gpp.org
TS 38.133
Series 38NR Requirements for support of radio resource management
NR RRM: measurement accuracy, mobility KPIs.
Open on 3gpp.org
TS 38.141-1
Series 38NR BS conformance testing Part 1: Conducted
Conducted RF conformance tests for gNB.
Open on 3gpp.org
TS 38.141-2
Series 38NR BS conformance testing Part 2: Radiated
OTA / radiated RF conformance for AAS gNB.
Open on 3gpp.org
TS 38.211
Series 38NR Physical channels and modulation
Numerology, RE grid, reference signals (DMRS, PTRS, CSI-RS).
Open on 3gpp.org
TS 38.212
Series 38NR Multiplexing and channel coding
Polar / LDPC coding, DCI and UCI formats.
Open on 3gpp.org
TS 38.213
Series 38NR Physical layer procedures for control
PDCCH, PUCCH, HARQ timing, power control.
Open on 3gpp.org
TS 38.214
Series 38NR Physical layer procedures for data
PDSCH / PUSCH scheduling, MCS tables, CSI.
Open on 3gpp.org
TS 38.215
Series 38NR Physical layer measurements
RSRP, RSRQ, SINR — L1/L3 measurement definitions.
Open on 3gpp.org
TS 38.300
Series 38NR and NG-RAN Overall description; Stage 2
Top-level 5G RAN architecture and procedures.
Open on 3gpp.org
TS 38.321
Series 38NR MAC protocol specification
MAC: logical channels, HARQ, BWP, DRX.
Open on 3gpp.org
TS 38.322
Series 38NR RLC protocol specification
NR RLC TM / UM / AM.
Open on 3gpp.org
TS 38.323
Series 38NR PDCP protocol specification
NR PDCP — ciphering, integrity, reordering.
Open on 3gpp.org
TS 38.331
Series 38NR RRC protocol specification
NR RRC messages, SIBs, UE capability, reconfiguration.
Open on 3gpp.org
TS 38.401
Series 38NG-RAN Architecture description
NG-RAN nodes, CU/DU split, functional entities.
Open on 3gpp.org
TS 38.410
Series 38NG-RAN; NG general aspects and principles
NG interface (gNB ↔ 5GC) protocol overview.
Open on 3gpp.org
TS 38.413
Series 38NG-RAN; NG Application Protocol (NGAP)
gNB ↔ AMF control-plane signalling over NG-C.
Open on 3gpp.org
TS 38.420
Series 38NG-RAN; Xn general aspects and principles
Xn interface between NG-RAN nodes.
Open on 3gpp.org
TS 38.423
Series 38NG-RAN; Xn Application Protocol (XnAP)
Xn handover, load info, mobility signalling.
Open on 3gpp.org
TS 38.470
Series 38NG-RAN; F1 general aspects and principles
F1 interface between gNB-CU and gNB-DU.
Open on 3gpp.org
TS 38.473
Series 38NG-RAN; F1 Application Protocol (F1AP)
F1-C signalling for UE-associated and non-UE-associated procedures.
Open on 3gpp.org
About 3GPP specifications
3GPP organises its technical specifications (TS) and reports (TR) into numbered series. The 21–29 series cover system architecture, services, NAS, and core network APIs; the 33 series covers security; the 36 series is LTE / E-UTRA; the 37 series handles multi-RAT including EN-DC; and the 38 series is 5G NR. Each release builds on the previous one, so spec numbers are stable over time — only the version (Rel-15, Rel-16, Rel-17…) changes.
For day-to-day reference, most engineers only touch 20 or so documents: 23.501 / 23.502 for the 5G core, 24.501 for NAS, 38.211 / 38.212 / 38.213 / 38.214 for the NR PHY, 38.331 for RRC, 38.413 for NGAP and 33.501 for security. This helper covers those plus a broader long tail.
Related tools
How to find a spec with the helper
- Type what you know. Enter a spec number, part of a title, or a keyword.
- Filter the list. The list narrows as you type to the matching TS/TR entries.
- Open the spec. Click the result to follow the direct link to the document.
Frequently asked questions
- How are 3GPP specification numbers structured?
- A 3GPP document is identified by a series and a number, like TS 38.331 or TR 38.913. TS marks a Technical Specification (normative) and TR a Technical Report (informative). The series — the first two digits — groups specs by area; the 38-series covers 5G NR, the 36-series LTE, the 23-series stage-2 architecture, and so on. Knowing the series alone often tells you roughly what a spec is about.
- What is the difference between a TS and a TR?
- A TS is a Technical Specification — it defines requirements you have to meet, so it is the normative reference. A TR is a Technical Report — background, studies and feasibility work that informs the specs but isn't binding. When you need the actual rule you cite the TS; the TR explains the thinking behind it.
- Does it link to the actual documents?
- Yes — each result carries a direct link out to the specification so you can jump from the number and title to the document itself rather than searching the 3GPP portal by hand.
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