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TECHNICAL REPORT
LTE;
Scenarios and requirements
for small cell enhancements for E-UTRA and E-UTRAN
(3GPP TR 36.932 version 15.0.0 Release 15)
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3GPP TR 36.932 version 15.0.0 Release 15 1 ETSI TR 136 932 V15.0.0 (2018-09)
Reference
RTR/TSGR-0036932vf00
Keywords
LTE
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3GPP TR 36.932 version 15.0.0 Release 15 2 ETSI TR 136 932 V15.0.0 (2018-09)
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Foreword
This Technical Report (TR) 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
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Modal verbs terminology
In the present document "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.
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3GPP TR 36.932 version 15.0.0 Release 15 3 ETSI TR 136 932 V15.0.0 (2018-09)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 4
1 Scope . 5
2 References . 5
3 Definitions, symbols and abbreviations . 5
3.1 Definitions . 5
3.2 Symbols . 5
3.3 Abbreviations . 5
4 Introduction . 6
5 Objective . 6
6 Target scenarios . 7
6.1 Deployment . 7
6.1.1 With and without macro coverage . 7
6.1.2 Outdoor and indoor . 7
6.1.3 Ideal and non-ideal backhaul . 7
6.1.4 Sparse and dense . 8
6.1.5 Synchronization . 8
6.2 Spectrum. 8
6.3 Traffic . 9
6.4 Backward compatibility . 9
7 Deployment-related requirements . 10
7.1 Deployment use cases . 10
7.2 Co-existence and interworking . 10
7.3 Core network aspects . 10
8 Capability and performance requirements . 11
8.1 System performance . 11
8.2 Mobility performance . 11
8.3 Coverage performance . 11
9 Operational Requirements . 12
9.1 Architecture . 12
9.2 Cost and complexity . 12
9.3 Energy efficiency . 12
9.4 Security . 12
Annex A: Change history . 13
History . 14
ETSI
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3GPP TR 36.932 version 15.0.0 Release 15 4 ETSI TR 136 932 V15.0.0 (2018-09)
Foreword
rd
This Technical Report 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.
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3GPP TR 36.932 version 15.0.0 Release 15 5 ETSI TR 136 932 V15.0.0 (2018-09)
1 Scope
The present document contains scenarios and requirements for the small cell enhancement for E-UTRA and E-UTRAN.
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 TR 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP TS 36.839: "Evolved Universal Terrestrial Radio Access (E-UTRA); Mobility
enhancements in heterogeneous networks".
[3] 3GPP TR 36.913: "Requirements for further advancements for Evolved Universal Terrestrial
Radio Access (E-UTRA) (LTE-Advanced)".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in TR 21.905 [1] 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 [1].
3.2 Symbols
For the purposes of the present document, the following symbols apply:
3.3 Abbreviations
For the purposes of the present document, the abbreviations given in TR 21.905 [1] 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 [1].
CDF: Cumulative Distribution Function
VoLTE Voice over LTE
ETSI
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3GPP TR 36.932 version 15.0.0 Release 15 6 ETSI TR 136 932 V15.0.0 (2018-09)
4 Introduction
Small cells using low power nodes are considered promising to cope with mobile traffic explosion, especially for
hotspot deployments in indoor and outdoor scenarios. A low-power node generally means a node whose Tx power is
lower than macro node and BS classes, for example Pico and Femto eNB are both applicable. Small cell enhancements
for E-UTRA and E-UTRAN will focus on additional functionalities for enhanced performance in hotspot areas for
indoor and outdoor using low power nodes.
This document captures the scenarios and requirements for small cell enhancements. 3GPP TR 36.913 [3] should be
used as reference whenever applicable in order to avoid duplication of the requirements.
5 Objective
The objectives of this document are as follows:
A) Define target scenarios for small cell enhancement considering:
- Deployment scenarios of small cell nodes
- Spectrum usage for small cell scenarios
- Traffic characteristics in small cell scenarios
B) Define requirements for small cell enhancement scenarios considering:
- System, mobility and coverage performance
- Core network related aspects
- Cost and energy efficiency aspects
- Security aspects
ETSI
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3GPP TR 36.932 version 15.0.0 Release 15 7 ETSI TR 136 932 V15.0.0 (2018-09)
6 Target scenarios
6.1 Deployment
Small cell enhancement should target both with and without macro coverage, both outdoor and indoor small cell
deployments and both ideal and non-ideal backhaul. Both sparse and dense small cell deployments should be
considered. (See Fig. 6.1-1)
F
F
1
2
NOTE 1: F1 and F2 are the carrier frequency for macro layer and local-node layer, respectively
Figure 6.1-1: Deployment scenarios of small cell with/without macro coverage
6.1.1 With and without macro coverage
As shown in Fig. 6.1-1, small cell enhancement should target the deployment scenario in which small cell nodes are
deployed under the coverage of one or more than one overlaid E-UTRAN macro-cell layer(s) in order to boost the
capacity of already deployed cellular network. Two scenarios can be considered:
1. Where the UE is in coverage of both the macro cell and the small cell simultaneously
2. Where the UE is not in coverage of both the macro cell and the small cell simultaneously
Figure 6.1-1 also shows the scenario where small cell nodes are not deployed under the coverage of one or more
overlaid E-UTRAN macro-cell layer(s). This scenario is also the target of the small cell enhancement Study Item.
6.1.2 Outdoor and indoor
Small cell enhancement should target both outdoor and indoor small cell deployments. The small cell nodes could be
deployed indoors or outdoors, and in either case could provide service to indoor or outdoor UEs.
For indoor UE, only low UE speed (0 – 3 km/h) is targeted. For outdoor, not only low UE speed, but also medium UE
speed (up to 30km/h and potentially higher speeds) is targeted.
Both throughput and mobility/connectivity shall be used as performance metric for both low and medium mobility. Cell
edge performance (e.g. 5%-tile CDF point for user throughput) and power efficiency (of both network and UE) are also
used as metrics for further study.
...