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TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
Location Measurement Unit (LMU) performance specification;
User Equipment (UE) positioning in UTRAN
(3GPP TS 25.111 version 15.0.0 Release 15)
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3GPP TS 25.111 version 15.0.0 Release 15 1 ETSI TS 125 111 V15.0.0 (2018-07)
Reference
RTS/TSGR-0425111vf00
Keywords
UMTS
ETSI
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3GPP TS 25.111 version 15.0.0 Release 15 2 ETSI TS 125 111 V15.0.0 (2018-07)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
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Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
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3GPP TS 25.111 version 15.0.0 Release 15 3 ETSI TS 125 111 V15.0.0 (2018-07)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 4
Introduction . 5
1 Scope . 6
2 References . 6
3 Definitions and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 6
4 General . 7
4.1 Main concepts . 7
4.2 LMU Classes . 7
4.3 U-TDOA architecture . 7
5 LMU radio characteristics . 8
5.1 Frequency bands . 8
5.2 Channel arrangement . 8
5.3 Reference sensitivity level . 9
5.4 Dynamic range . 9
5.5 Adjacent Channel Selectivity (ACS) . 9
5.6 Blocking characteristics . 9
5.7 Intermodulation characteristics . 13
5.8 Spurious emissions . 14
6 LMU measurement requirements . 15
6.1 General . 15
6.2 RRC States supported . 15
6.3 Maximum response times . 15
6.4 Nominal time accuracy . 15
6.5 Multipath scenarios . 16
6.6 Moving scenario . 16
6.7 Cross correlation . 16
Annex A (informative): Change history . 17
History . 18
ETSI
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3GPP TS 25.111 version 15.0.0 Release 15 4 ETSI TS 125 111 V15.0.0 (2018-07)
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
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3GPP TS 25.111 version 15.0.0 Release 15 5 ETSI TS 125 111 V15.0.0 (2018-07)
Introduction
In order to ensure correctness and consistency of the specifications (i.e., technical specifications and technical reports)
rd
under responsibility of the Technical Specification Groups (TSG) of the 3 Generation Partnership Project (3GPP),
clear, manageable and efficient mechanisms are necessary to handle version control, change control, document
updating, distribution and management.
Also, the fact that the specifications are/will be implemented by industry almost in parallel with the writing of them
requires strict and fast procedures for handling of changes to the specifications.
It is very important that the changes that are brought into the standard, from the past, at present and in the future, are
well documented and controlled, so that technical consistency and backwards tracing are ensured.
The 3GPP TSGs, and their sub-groups together with the Support Team are responsible for the technical content and
consistency of the specifications whilst the Support Team alone is responsible for the proper management of the entire
documentation, including specifications, meeting documents, administrative information and information exchange with
other bodies.
ETSI
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3GPP TS 25.111 version 15.0.0 Release 15 6 ETSI TS 125 111 V15.0.0 (2018-07)
1 Scope
The present document establishes the Location Measurement Unit (LMU) minimum RF characteristics of the FDD
mode of UTRA.
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 25.104: “Base Station (BS) radio transmission and reception (FDD)”.
[2] 3GPP TS 45.004: “Modulation”.
[3] 3GPP TS 25.141: “Base Station (BS) conformance testing (FDD)”.
[4] 3GPP TR 25.942: “Radio Frequency (RF) system scenarios”.
[5] 3GPP TR 21.905: “Vocabulary for 3GPP Specifications”.
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in TR 21.905 [5] and the following apply. A
term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 [5].
Mean power: When applied to a W-CDMA modulated signal this is the power (transmitted or received) in a bandwidth
of at least (1+ α) times the chip rate of the radio access mode. The period of measurement shall be at least one timeslot
unless otherwise stated.
NOTE: The roll-off factor α is defined in clause 6.8.1 of [1].
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in TR 21.905 [5] and the following apply. An
abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in
TR 21.905 [5].
ACS Adjacent Channel Selectivity
BS Base Station
BER Bit Error Ratio
BLER Block Error Ratio
CW Continuous Wave (unmodulated signal)
DL Down Link (forward link)
FDD Frequency Division Duplexing
GSM Global System for Mobile Communications
LMU Location Measurement Unit
UARFCN UTRA Absolute Radio Frequency Channel Number
UE User Equipment
UL Up Link (reverse link)
ETSI
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3GPP TS 25.111 version 15.0.0 Release 15 7 ETSI TS 125 111 V15.0.0 (2018-07)
U-TDOA Uplink Time Difference Of Arrival
WCDMA Wideband Code Division Multiple Access
4 General
4.1 Main concepts
The LMU is either located as a separate unit in an existing network or typically located at Node B or BTS sites.
Therefore the LMU radio requirements assume that the isolation between the LMU and any other network to be
protected is to be at least 30dB.
The communication link between LMU and Stand-Alone SMLC is not a radio interface over the air. Requirements in
this document therefore do not cover the situation when the LMU is transmitting over the air on this interface between
LMU and Stand-Alone SMLC.
4.2 LMU Classes
The requirements in this specification apply to Wide Area LMUs and Medium Range LMUs.
Wide Area LMUs are characterised by requirements derived from Macro Cell scenarios with an LMU to UE minimum
coupling loss equal to 70 dB.
Medium Range LMUs are characterised by requirements derived from Micro Cell scenarios with an LMU to UE
minimum coupling loss equal to 53 dB.
For Pico Cell scenarios, the location of the BS provides sufficient accuracy; therefore, a Local Area LMUs class is not
specified.
4.3 U-TDOA architecture
A sample architecture is shown in Figure 3.1 depicting the LMU’s relationship with other network elements. The LMU
is typically located at the Node B. The LMUs communicate with the SMLC that distributes UTDOA reference data
from the reference LMU to other cooperating LMUs when performing UE positioning.
ETSI
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3GPP TS 25.111 version 15.0.0 Release 15 8 ETSI TS 125 111 V15.0.0 (2018-07)
Iub
Node B RNC
LMU
LMU
MSC
Iupc
LMU
Stand-Alone
SMLC
Iupc
LMU SGSN
LMU
Node B RNC
Iub
Figure 3.1: Example of UTDOA deployment
5 LMU radio characteristics
An LMU performs BS receiver functions to obtain reference data for use at a cooperating LMU. The following clause
describes the required LMU radio characteristics when performing these functions.
5.1 Frequency bands
a) The LMU is designed to operate in the following bands:
Table 4.1: Frequency bands
Operating UL Frequencies
Band UE transmit, LMU receive
I 1920 – 1980 MHz
II 1850 -1910 MHz
III 1710-1785 MHz
IV 1710-1755 MHz
V 824 – 849MHz
VI 830-840 MHz
VII 2500 – 2570 MHz
VIII 880 – 915 MHz
IX 1749.9 – 1784.9 MHz
X 1710-1770 MHz
b) Deployment in other frequency bands is not precluded
5.2 Channel arrangement
The channel arrangement shall be as specified in Section 5.4 of [1].
ETSI
Typically located at Node B
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3GPP TS 25.111 version 15.0.0 Release 15 9 ETSI TS 125 111 V15.0.0 (2018-07)
5.3 Reference sensitivity level
Using the reference measurement channel specification in TS 25.104 Annex A [1], the reference sensitivity level and
performance of the LMU shall be as specified in Table 4.2.
Table 4.2: LMU reference sensitivity levels
LMU Class Reference measurement LMU sensitivity level (dBm) BER
channel data rate
Wide Area LMU 12.2 kbps -121 BER shall not exceed 0.001
Medium Range LMU 12.2 kbps -111 BER shall not exceed 0.001
5.4 Dynamic range
Receiver dynamic range is the receiver ability to handle a rise of interference in the reception frequency channel. The
receiver shall fulfil a specified BER requirement for a specified sensitivity degradation of the wanted signal in the
presence of an interfering AWGN signal in the same reception frequency channel.
The BER shall not exceed 0.001 for the parameters specified in Table 4.3.
Table 4.3: Dynamic range
Parameter Level Wide Level Medium Unit
Area LMU Range LMU
Reference measurement 12.2 12.2 kbps
channel data rate
Wanted signal mean -91 -81 dBm
power
Interfering AWGN signal -73 -63 dBm/3.84 MHz
5.5 Adjacent Channel Selectivity (ACS)
Adjacent channel selectivity (ACS) is a measure of the LMU receiver ability to receive a wanted signal at its assigned
channel frequency in the presence of an adjacent channel signal at a given frequency offset from the centre frequency of
the assigned channel. ACS is the ratio of the LMU receiver filter
...