Canonical Atlas record

TS 51.021

Base Station System (BSS) equipment specification; Radio aspects

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Responsible WGRP

StatusUnder change control

Initial releaseRel-4

Selected releaseRel-10

Latest indexed version19.0.0

Series51

TypeTS

Release evolution

Compare evidence between releases

Use indexed version, Work Item and Change Request evidence to see what changed around this specification. This is an evidence trail, not a clause-by-clause normative diff.

Release ledger

Version · WI · CR evidence by release

Rel-44.7.01 WI17 CRs · 12 approved

Rel-55.6.02 WI18 CRs · 12 approved

Rel-66.5.01 WI13 CRs · 9 approved

Rel-77.10.012 WI65 CRs · 29 approved

Rel-88.13.04 WI183 CRs · 78 approved

Rel-99.10.07 WI123 CRs · 57 approved

Rel-1010.7.03 WI67 CRs · 30 approved

Rel-1111.4.04 WI21 CRs · 12 approved

Rel-1212.3.02 WI10 CRs · 4 approved

Rel-1313.9.03 WI18 CRs · 9 approved

Rel-1414.8.04 WI30 CRs · 15 approved

Rel-1515.3.00 WI3 CRs · 3 approved

Rel-1616.0.00 WI0 CRs

Rel-1717.0.00 WI0 CRs

Rel-1818.0.00 WI0 CRs

Rel-1919.0.00 WI0 CRs

R99no version indexed4 WI0 CRs

Rel-10 snapshot

Work affecting this release

67 indexed Change Requests · 3 connected Work Items.

Showing 12 CR records from the available cross-release sample. Browse release CR records (JSON) →

CR 0252 — Miscellaneous corrections for multicarrier BTS testing requirements

CR 0248 — Miscellaneous corrections

CR 0214 rev.1 — Aligning MCBTS testing according to MSR-NC principles

CR 0246 — Miscellaneous corrections

CR 0245 — Intra BSS Intermodulation attenuation – protection of operating RX band

CR 0214 — Aligning MCBTS testing according to MSR-NC principles

CR 0201 rev.1 — Power versus time mask for AQPSK

CR 0242 rev.1 — Spurious emission and Intermodulation attenuation – protection of operating RX band

CR 0242 — Spurious emission and Intermodulation attenuation – protection of operating RX band

CR 0213 rev.1 — Uplink receiver performance requirements for VAMOS

CR 0239 rev.1 — Clarifications in the MCBTS test for wideband noise and IM

CR 0239 — Clarifications in the MCBTS test for wideband noise and IM

Version history

Indexed versions

Showing 60 of 103 indexed versions.

19.0.0Rel-19SA#1092025-10-14

18.0.0Rel-18SA#1032024-04-04

17.0.0Rel-17SA#95-e2022-04-06

16.0.0Rel-16SA#88-e2020-07-19

15.3.0Rel-15RAN#87-e2020-04-02

14.8.0Rel-14RAN#87-e2020-04-02

13.9.0Rel-13RAN#87-e2020-04-02

15.2.0Rel-15RAN#832019-03-29

14.7.0Rel-14RAN#832019-03-29

13.8.0Rel-13RAN#832019-03-29

15.1.0Rel-15RAN#812018-09-21

14.6.0Rel-14RAN#812018-09-21

13.7.0Rel-13RAN#812018-09-21

15.0.0Rel-15SA#802018-06-23

14.5.0Rel-14RAN#802018-06-23

13.6.0Rel-13RAN#802018-06-23

14.4.0Rel-14RAN#792018-04-03

13.5.0Rel-13RAN#792018-04-03

14.3.0Rel-14RAN#782018-01-15

14.2.0Rel-14RAN#772017-09-25

14.1.0Rel-14RAN#762017-06-23

13.4.0Rel-13RAN#762017-06-23

14.0.0Rel-14RAN#752017-03-21

13.3.1Rel-13RAN#742017-02-01

13.3.0Rel-13RAN#742016-12-23

13.2.1Rel-13RAN#732016-10-03

13.2.0Rel-13RAN#732016-09-30

13.1.0Rel-13GERAN#702016-06-21

13.0.0Rel-13SA#702015-12-18

12.3.0Rel-12GERAN#642014-12-22

12.2.0Rel-12GERAN#632014-09-26

12.1.0Rel-12GERAN#622014-06-27

12.0.0Rel-12GERAN#612014-03-17

11.4.0Rel-11GERAN#592013-09-19

11.3.0Rel-11GERAN#582013-06-27

11.2.0Rel-11GERAN#572013-03-15

11.1.0Rel-11GERAN#562012-12-20

10.7.0Rel-10GERAN#562012-12-20

9.10.0Rel-9GERAN#552012-09-21

8.13.0Rel-8GERAN#552012-09-21

11.0.0Rel-11GERAN#552012-09-21

10.6.0Rel-10GERAN#552012-09-21

9.9.0Rel-9GERAN#542012-06-29

8.12.0Rel-8GERAN#542012-06-29

10.5.0Rel-10GERAN#542012-06-29

10.4.0Rel-10GERAN#532012-03-16

9.8.0Rel-9GERAN#522011-12-21

8.11.0Rel-8GERAN#522011-12-21

10.3.0Rel-10GERAN#522011-12-21

9.7.0Rel-9GERAN#512011-09-30

10.2.0Rel-10GERAN#512011-09-30

9.6.0Rel-9GERAN#502011-06-17

8.10.0Rel-8GERAN#502011-06-17

10.1.0Rel-10GERAN#502011-06-17

9.5.0Rel-9GERAN#492011-04-02

10.0.0Rel-10SA#512011-04-02

9.4.0Rel-9GERAN#482010-12-21

8.9.0Rel-8GERAN#482010-12-21

9.3.0Rel-9GERAN#472010-10-01

8.8.0Rel-8GERAN#472010-10-01

Atlas classifications

Meaning and provenance

No Atlas classifications have been attached yet.

Work Items

Standards work connected to TS 51.021

TEI4

(Small) Technical Enhancements and Improvements for Rel-4

Rel-4parsed

TEI5

(Small) Technical Enhancements and Improvements for Rel-5

Rel-5parsed

TLM5

Rel-5 Terminal interfaces

Rel-5official

TEI6

(Small) Technical Enhancements and Improvements for Rel-6

Rel-6parsed

WI 53084

G1 aspects of GSM710

Rel-7official

GSM710

Lower 700 MHz Inclusion in the GERAN Specifications

Rel-7official

HUGE

Higher Uplink performance for GERAN Evolution

Rel-7official

HUGE-BTStest

BTS Conformance Test for HUGE

Rel-7official

LATRED

Latency Reductions

Rel-7official

LATRED-ACKNAR

Improved Ack/Nack reporting

Rel-7official

LATRED-REDTTI

Reduced TTI

Rel-7official

REDHOT

REduced symbol Duration, Higher Order modulation and Turbo coding (RED HOT) for downlink

Rel-7official

REDHOT-BTStest

BTS Conformance Tests for REDHOT

Rel-7official

SCSAGB-RLCNP

Support of Conversational Services in A/Gb mode via the PS domain RLC Non-Persistent mode

Rel-7official

TEI7

(Small) Technical Enhancements and Improvements for Rel-7

Rel-7parsed

TGSM810

Addition of new frequency band to GSM (T-GSM810)

Rel-7official

CTLATRED

Conformance testing for the Latency Reductions feature

Rel-8official

CTLATRED-BTStest

BTS conformance testing for the Latency Reductions feature

Rel-8official

MCBTS

New multicarrier BTS class

Rel-8official

TEI8

(Small) Technical Enhancements and Improvements for Rel-8

Rel-8parsed

RInImp9-RFmulti-GERAN

GERAN part of RF requirements for Multicarrier and Multi RAT BS

Rel-9official

TEI9

(Small) Technical Enhancements and Improvements for Rel-9

Rel-9official

VAMOS

Voice services over Adaptive Multi-user channels on One Slot

Rel-9official

VAMOS

Stage 3 for Voice services over Adaptive Multi-user channels on One Slot

Rel-9official

VAMOS

VAMOS Radio Performance Requirements

Rel-9official

VAMOS

Stage 2 for Voice services over Adaptive Multi-user channels on One Slot

Rel-9official

VAMOS_BTStest

VAMOS - BTS conformance testing

Rel-9official

MSR_NC-GERAN

GERAN BS Test part: Multi-Standard Radio BS RF requirements for non-contiguous spectrum deployments

Rel-10official

MSR_NC-GERAN

GERAN part: Multi-Standard Radio BS RF requirements for non-contiguous spectrum deployments

Rel-10official

RED

Deleted - Registration in Densely-populated area (RED)

Rel-10official

MRLA

Medium range/local area requirements for multicarrier BTS

Rel-11parsed

MRLA-Perf

Perf. part: Medium range/local area requirements for multicarrier BTS

Rel-11official

TEI11

(Small) Technical Enhancements and Improvements for Rel-11

Rel-11parsed

medBS_class_LTE_MSR-GERAN

GERAN part: E-UTRA medium range and MSR medium range/local area BS class requirements

Rel-11official

RT_ERGSM

Test part: Introduction of ER-GSM band for GSM-R

Rel-12official

TEI12

(Small) Technical Enhancements and Improvements for Rel-12

Rel-12parsed

CIoT_EC_GSM

Extended Coverage GSM (EC-GSM) for support of Cellular Internet of Things

Rel-13parsed

CIoT_EC_GSM-Perf

Perf. Part: Extended Coverage GSM (EC-GSM) for support of Cellular Internet of Things

Rel-13parsed

TEI13

(Small) Technical Enhancements and Improvements for Rel-13

Rel-13parsed

CIoT_EC_GSM_radio_enh-Perf

Perf. part: Radio Interface Enhancements for Extended Coverage GSM for support of Cellular Internet of Things

Rel-14parsed

TEI14

(Small) Technical Enhancements and Improvements for Rel-14

Rel-14parsed

ePOS_GERAN-Core

Core part: Positioning Enhancements for GERAN

Rel-14parsed

ePOS_GERAN-Perf

Perf. part: Positioning Enhancements for GERAN

Rel-14parsed

EDGE

Enhanced Data rates for GSM Evolution

R99official

GPRS

General Packet Radio Service

R99official

PR,Princs_&_Reqs_(PR)

OAM Principles and High-level Requirements

R99official

TEI

(Small) Technical Enhancements and Improvements for R99

R99parsed

Knowledge graph

Related standards

No graph edges indexed yet. The graph API is available at this JSON endpoint.