ETSI TS 137 461 V17.1.0 (2022-07)

Universal Mobile Telecommunications System(UMTS) ;LTE ;5G ; Iuant interface: Layer 1 (3GPP TS 37.461 version 17.1.0 Release 17)

RTS/TSGR-0337461vh10

General Information

• Status: Not Published
• Technical Committee: 3GPP RAN 3 - lub specification, lur specification, lu specification and UTRAN & O&M
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Completion Date: 20-Jul-2022

Standards Content (Sample)

TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
LTE;
5G;
Iuant interface: Layer 1
(3GPP TS 37.461 version 17.1.0 Release 17)

3GPP TS 37.461 version 17.1.0 Release 17 1 ETSI TS 137 461 V17.1.0 (2022-07)

Reference
RTS/TSGR-0337461vh10
Keywords
5G,LTE,UMTS
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ETSI
3GPP TS 37.461 version 17.1.0 Release 17 2 ETSI TS 137 461 V17.1.0 (2022-07)
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Legal Notice
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
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ETSI
3GPP TS 37.461 version 17.1.0 Release 17 3 ETSI TS 137 461 V17.1.0 (2022-07)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 4
1 Scope . 5
2 References . 5
3 Definitions and abbreviations . 5
3.1 Definitions . 5
3.2 Abbreviations . 5
4 Iuant layer 1 . 6
4.1 General . 6
4.2 RS485 option . 7
4.3 Modem option . 7
4.3.1 Interference with existing systems . 9
4.3.1.1 Carrier frequency and frequency stability . 9
4.3.1.2 Modem isolation and modem emissions . 9
4.3.1.3 Modem intermodulation attenuation . 10
4.3.2 Recovery time . 10
4.3.3 Impedance . 10
4.3.4 Modulator characteristics . 11
4.3.4.1 Levels . 11
4.3.4.2 Spectrum emission mask . 11
4.3.5 Demodulator characteristics. 11
4.3.6 Duty cycle variation . 11
4.3.7 Operating bands . 12
4.3.8 Time delay and accuracy . 12
4.3.9 Insertion Loss. 12
4.3.10 DC port isolation . 13
4.3.11 RET control unit spurious emission . 13
4.3.12 Control unit spurious emission . 13
4.4 DC power supply . 14
4.4.1 Power consumption. 14
4.4.2 Conducted emission . 14
4.4.3 Power-up characteristics . 14
Annex A (normative): Test procedures . 16
Annex B (informative): Change history . 17
History . 18

ETSI
3GPP TS 37.461 version 17.1.0 Release 17 4 ETSI TS 137 461 V17.1.0 (2022-07)
Foreword
rd
This Technical Specification has been produced by the 3 Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
Y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
ETSI
3GPP TS 37.461 version 17.1.0 Release 17 5 ETSI TS 137 461 V17.1.0 (2022-07)
1 Scope
The present document specifies the standards allowed to implement layer 1 on the Iuant interface for UTRA, E-UTRA
and NR.
The specification of transmission delay requirements and O&M requirements are not in the scope of the present
document.
The modem option of Iuant layer 1 specification in clause 4.3 applies to UTRA, E-UTRA BS and NR BS type 1-C.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
● References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
● For a specific reference, subsequent revisions do not apply.
● For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] 3GPP TS 37.462: "UTRAN Iuant interface: Signalling transport".
[2] ISO/IEC 8482 (1993-12): "Information technology - Telecommunications and information
exchange between systems - Twisted pair multipoint interconnections".
[3] TIA/EIA TSB89: "Application guidelines for TIA/EIA-485-A".
[4] 3GPP TS 25.101: "Technical Specification Group Radio Access Network; User Equipment (UE)
radio transmission and reception (FDD)"
[5] 3GPP TS 36.101: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE)
radio transmission and reception"
[6] 3GPP TS 38.101: "NR; User Equipment (UE) radio transmission and reception (FDD)"

3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
On-Off-Keying: A modulation system in which a carrier is switched between two states, ON and OFF.
Common feeder cable: Feeder cable where some antenna line devices (e.g. RET, TMA) are connected via the same
feeder cable.
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
BS Base Station
DC Direct Current
ETSI
3GPP TS 37.461 version 17.1.0 Release 17 6 ETSI TS 137 461 V17.1.0 (2022-07)
DL Downlink
FDD Frequency Division Duplex
ISB Idle-State Biasing
OOK On-Off-Keying
RET Remote Electrical Tilting
RF Radio Frequency
TMA Tower Mounted Amplifier
UE User Equipment
UL Uplink
UMTS Universal Mobile Telecommunications System
UTRA UMTS Terrestrial Radio Access
4 Iuant layer 1
4.1 General
There are two layer 1 options:
- RS485 option: A screened multicore cable, which supports a conventional RS485 serial multi-drop bus.
- Modem option: A connection to a RET and/or a TMA control unit by way of a coaxial cable which is shared
with DC supply and RF signals.
Both layer 1 options support the connection of two-way serial data and DC power to the RET and/or TMA antenna
device.
At least one of these two layer 1 options shall be supported.
The default data rate for both layer 1 options shall be 9.6 kbps. Higher data rates of 38.4 kbps for both layer 1 options
and 115.2 kbps only for the RS485 layer 1 option may optionally be supported. Each unit communicates on one of the
three data rates, but different units on the same interface may use different data rates.
After a reset, a secondary device shall alternate between supported data rates. When alternating between data rates, the
data rate shall be held constant for 300 ms. After every correctly received device scan command (see TS 37.462 [1])
independent of whether it matches or not, at one of the supp
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