ETSI TS 137 320 V16.2.0 (2020-11)

Universal Mobile Telecommunications System (UMTS); LTE; Universal Terrestrial Radio Access (UTRA) and Evolved Universal Terrestrial Radio Access (E-UTRA); Radio measurement collection for Minimization of Drive Tests (MDT); Overall description; Stage 2 (3GPP TS 37.320 version 16.2.0 Release 16)

RTS/TSGR-0237320vg20

General Information

• Status: Not Published
• Technical Committee: 3GPP RAN 2 - Radio layer 2 specification and Radio layer 3 RR specification
• Current Stage: 12 - Completion
• Completion Date: 16-Nov-2020

Standards Content (Sample)

ETSI TS 137 320 V16.2.0 (2020-11)






TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
LTE;
Universal Terrestrial Radio Access (UTRA)
and Evolved Universal Terrestrial Radio Access (E-UTRA);
Radio measurement collection for Minimization of
Drive Tests (MDT);
Overall description;
Stage 2
(3GPP TS 37.320 version 16.2.0 Release 16)

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3GPP TS 37.320 version 16.2.0 Release 16 1 ETSI TS 137 320 V16.2.0 (2020-11)



Reference
RTS/TSGR-0237320vg20
Keywords
LTE,UMTS
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3GPP TS 37.320 version 16.2.0 Release 16 2 ETSI TS 137 320 V16.2.0 (2020-11)
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ETSI

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3GPP TS 37.320 version 16.2.0 Release 16 3 ETSI TS 137 320 V16.2.0 (2020-11)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 5
1 Scope . 6
2 References . 6
3 Definitions, symbols and abbreviations . 7
3.1 Definitions . 7
3.2 Symbols . 7
3.3 Abbreviations . 7
4 Main concept and requirements . 9
4.1 General . 9
5 Functions and procedures . 10
5.1 General procedures . 10
5.1.1 Logged MDT procedures . 10
5.1.1.1 Measurement configuration. 10
5.1.1.1.1 Configuration parameters . 11
5.1.1.1.2 Configuration effectiveness . 12
5.1.1.2 Measurement collection . 13
5.1.1.3 Measurement reporting . 14
5.1.1.3.1 Availability Indicator . 14
5.1.1.3.2 Report retrieval . 15
5.1.1.3.3 Reporting parameters . 15
5.1.1.4 MDT context handling . 17
5.1.2 Immediate MDT procedures . 17
5.1.2.1 Measurement configuration . 17
5.1.2.2 Measurement reporting . 18
5.1.2.3 MDT context handling during handover . 18
5.1.3 MDT Initiation . 18
5.1.4 UE capabilities . 19
5.1.5 Void . 19
5.1.6 Accessibility measurements . 19
5.2 E-UTRAN solutions . 21
5.2.1 RRC_CONNECTED . 21
5.2.1.1 Measurements and reporting triggers for Immediate MDT . 21
5.2.1.2 Enhancementto Radio Link Failure report . 22
5.2.1.3 Detailed Location Information . 22
5.2.2 RRC_IDLE . 23
5.3 UTRAN solutions . 23
5.3.1 UTRA RRC Connected . 23
5.3.1.1 Measurements and reporting events for Immediate MDT . 23
5.3.1.2 Detailed Location Information . 24
5.3.2 UTRA Idle . 24
5.4 NR solutions . 25
5.4.0 General . 25
5.4.1 RRC_CONNECTED . 25
5.4.1.1 Measurements and reporting triggers for Immediate MDT . 25
5.4.1.2 Radio Link Failure report . 26
5.4.1.3 Immediate MDT for MR-DC . 27
5.4.2 RRC_IDLE & RRC_INACTIVE . 27
Annex A (informative): Coverage use cases . 28
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3GPP TS 37.320 version 16.2.0 Release 16 4 ETSI TS 137 320 V16.2.0 (2020-11)
Annex B (informative): QoS verification use cases . 29
Annex C (informative): Measurements . 30
Annex D (informative): MBSFN use cases . 31
Annex E (informative): Change history . 32
History . 35

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3GPP TS 37.320 version 16.2.0 Release 16 5 ETSI TS 137 320 V16.2.0 (2020-11)
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.
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3GPP TS 37.320 version 16.2.0 Release 16 6 ETSI TS 137 320 V16.2.0 (2020-11)
1 Scope
The present document provides an overview and overall description of the minimization of drive tests functionality.
The document describes functions and procedures to support collection of UE-specific measurements for MDT using
Control Plane architecture, for both UTRAN, E-UTRAN and NR.
Details of the signalling procedures for single-RAT operation are specified in the appropriate radio interface protocol
specification. Network operation and overall control of MDT is described in OAM specifications.
NOTE: The focus is on conventional macro cellular network deployments. In the current release no specific
support is provided for H(e)NB deployments.
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 25.133: "Requirements for support of radio resource management (FDD)".
[3] 3GPP TS 36.133: "Requirements for support of radio resource management (FDD)".
[4] 3GPP TS 25.331: "Radio Resource Control (RRC); Protocol specification".
[5] 3GPP TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource
Control (RRC); Protocol specification".
[6] 3GPP TS 32.422: "Subscriber and equipment trace; Trace control and configuration management".
[7] 3GPP TS 25.215: "Physical Layer; Measurements (FDD)".
[8] 3GPP TS 25.225: "Physical Layer; Measurements (TDD)".
[9] 3GPP TS 36.214: "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Layer;
Measurements".
[10] 3GPP TS 36.321: "Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access
Control (MAC); Protocol Specification".
[11] 3GPP TS 36.213: "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer
procedures".
[12] 3GPP TS 36.300: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal
Terrestrial Radio Access (E-UTRAN); Overall description; Stage 2".
[13] 3GPP TS 36.314: "Evolved Universal Terrestrial Radio Access (E-UTRA); Layer 2 –
Measurements".
[14] 3GPP TS 25.321: "Medium Access Control (MAC) Protocol Specification".
[15] 3GPP TS 38.331: "NR; Radio Resource Control (RRC); Protocol specification".
[16] 3GPP TS 38.133: "NR; Requirements for support of radio resource management".
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3GPP TS 37.320 version 16.2.0 Release 16 7 ETSI TS 137 320 V16.2.0 (2020-11)
[17] 3GPP TS 28.552: "Technical Specification Group Services and System Aspects; Management and
orchestration; 5G performance measurements".
[18] 3GPP TS 38.314: "NR; Layer 2 Measurements".
[19] 3GPP TS 38.215: " NR; Physical layer measurements".
[20] 3GPP TS 38.213: " NR; Physical layer procedures for control".
[21] 3GPP TS 38.321: "NR; Medium Access Control (MAC) protocol specification".
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] apply.
Immediate MDT: MDT functionality involving measurements performed by the UE in CONNECTED state and
reporting of the measurements to RAN available at the time of reporting condition as well as measurements by the
network for MDT purposes.
Logged MDT: MDT functionality involving measurement logging by UE in IDLE mode, INACTIVE state,
CELL_PCH, URA_PCH states and CELL_FACH state when second DRX cycle is used (when UE is in UTRA) for
reporting to eNB/RNC/gNB at a later point in time, and logging of MBSFN measurements by E-UTRA UE in IDLE
and CONNECTED modes.
Management Based MDT PLMN List: MDT PLMN List applicable to management based MDT.
MDT measurements: Measurements determined for MDT.
MDT PLMN List: A list of PLMNs where MDT is allowed for a user. It is a subset of the EPLMN list and RPLMN at
the time when MDT is initiated.
Signalling Based MDT PLMN List: MDT PLMN List applicable to signalling based MDT.
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].
ACK Acknowledgement
AICH Acquisition Indicator Channel
BLER Block Error Rate
BSSID Basic Service Set Identifier
CA Carrier Aggregation
CDMA Code Division Multiple Access
CN Core Network
CPICH Common Pilot Channel
DCH Dedicated CHannel
DL Downlink
DRX Discontinuous Reception
ECGI E-UTRAN Cell Global Identifier
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3GPP TS 37.320 version 16.2.0 Release 16 8 ETSI TS 137 320 V16.2.0 (2020-11)
E-CID Enhanced Cell-ID (positioning method)
E-DCH Enhanced Uplink DCH
EDGE Enhanced Data rates for GSM Evolution
E-RUCCH E-DCH Random Access Uplink Control CHannel
eNB Evolved NodeB
EPLMN Equivalent PLMN
E-UTRA Evolved UTRA
E-UTRAN Evolved UTRAN
FACH Forward Access CHannel
FDD Frequency Division Duplex
FIFO First Input First Output
FPACH Fast Physical Access CHannel
GERAN GSM EDGE Radio Access Network
gNB Next Generation Node B
GNSS Global Navigation Satellite System
HESSID Homogenous Extended Service Set Identifier
HOF Handover Failure
IMEI-SV International Mobile Equipment Identity Software Version
IMSI International Mobile Subscriber Identity
IP Internet Protocol
ISCP Interference on Signal Code Power
LA Location Area
LTE Long Term Evolution
MAC Medium Access Control
MBMS Multimedia Broadcast Multicast Service
MBSFN MBMS Single Frequency Network
MDT Minimization of Drive-Tests
NG-RAN Next Generation RAN
NR New Radio
OAM Operation and Maintenance
P-CCPCH Primary Physical Common Control CHannel
PCH Paging Channel
PCI Physical Cell Id
PDCP Packet Data Convergence Protocol
PH Power Headroom
PLMN Public Land Mobile Network
PS Packet Switched
QCI QoS Class Identifier
QoS Quality of Service
RA Routing Area
RAB Radio Access Bearer
RAT Radio Access Technology
RB Radio Bearer
RF Radio Frequency
RLC Radio Link Control
RLF Radio Link Failure
RNC Radio Network Controller
RPLMN Registered PLMN
RRC Radio Resource Control
RRM Radio Resource Management
RSCP Received Signal Code Power
RSRP Reference Signal Received Power
RSRQ Reference Signal Received Quality
RSSI Received Signal Strength Indicator
RTT Round Trip Time
RTWP Received Total Wideband Power
SCell Secondary Cell
SIR Signal to Interference Ratio
SINR Signal to Noise plus Interference Ratio
SNR Signal to Noise Ratio
SON Self Organizing/Optimizing Network
SRB Signalling Radio Bearer
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3GPP TS 37.320 version 16.2.0 Release 16 9 ETSI TS 137 320 V16.2.0 (2020-11)
SRNC Serving RNC
SSB Synchronization Signal Block
SSID Service Set Identifier
TA Tracking Area
TCE Trace Collection Entity
TDD Time Division Duplex
UE User Equipment
UL Uplink
UMTS Universal Mobile Telecommunication System
UPH Uplink PH
URA UTRAN Registration Area
UTRA Universal Terrestrial Radio Access
UTRAN Universal Terrestrial Radio Access Network

4 Main concept and requirements
4.1 General
The general principles and requirements guiding the definition of functions for Minimization of drive tests are the
following:
1. MDT mode
There are two modes for the MDT measurements: Logged MDT and Immediate MDT. There are also cases of
measurement collection not specified as either immediate or logged MDT, such as Accessibility measurements.
2. UE measurement configuration
It is possible to configure MDT measurements for the UE logging purpose independently from the network
configurations for normal RRM purposes. However, in most cases, the availability of measurement results is
conditionally dependent on the UE RRM configuration.
3. UE measurement collection and reporting
UE MDT measurement logs consist of multiple events and measurements taken over time. The time interval for
measurement collection and reporting is decoupled in order to limit the impact on the UE battery consumption
and network signalling load.
4. Geographical scope of measurement logging
It is possible to configure the geographical area where the defined set of measurements shall be collected.
5. Location information
The measurements shall be linked to available location information and/or other information or measurements
that can be used to derive location information.
6. Time information
The measurements in measurement logs shall be linked to a time stamp.
7. Sensor information
The measurements can be linked to available sensor information that can be used to derive UE orientation in a
global coordinate system, the uncompensated barometric pressure and the UE speed.
8. UE capability information
The network may use UE capabilities to select terminals for MDT measurements.
9. Dependency on SON
The solutions for MDT are able to work independently from SON support in the network. Relation between
measurements/solution for MDT and UE side SON functions shall be established in a way that re-use of
functions is achieved where possible.
10. Dependency on TRACE
The subscriber/cell trace functionality is reused and extended to support MDT. If the MDT is initiated toward to
a specific UE (e.g. based on IMSI, IMEI-SV, etc.), the signalling based trace procedure is used, otherwise the
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3GPP TS 37.320 version 16.2.0 Release 16 10 ETSI TS 137 320 V16.2.0 (2020-11)
management based trace procedure (or cell traffic trace procedure) is used. Network signalling and overall
control of MDT is described in TS 32.422 [6].
The solutions for MDT shall take into account the following constraints:
1. UE measurements
The UE measurement logging mechanism is an optional feature. In order to limit the impact on UE power
consumption and processing, the UE measurement logging should as much as possible rely on the measurements
that are available in the UE according to radio resource management enforced by the access network.
2. Location information
The availability of location information is subject to UE capability and/or UE implementation. Solutions
requiring location information shall take into account power consumption of the UE due to the need to run its
positioning components.
5 Functions and procedures
5.1 General procedures
5.1.1 Logged MDT procedures
Support of Logged MDT complies with the principles for IDLE and INACTIVE state measurements in the UE specified
in TS 25.133[2], TS 36.133 [3] and TS 38.133 [16] and principles for IDLE and CONNECTED mode MBSFN
measurements in the UE specified in TS 36.133 [3].
NOTE: It should be noted the established principles may result in different logged information in different UEs.
Furthermore, measurement logging is differentiated based on UE states in idle mode i.e. camped normally, any cell
selection or camped on any cell. The UE shall perform measurement logging in "camped normally" state and "any cell
selection" state. In "camped on any cell" state the UE is not required to perform MDT measurement logging (including
time and location information).
For Logged MDT, the configuration will always be done in cells of the same RAT type. However, measurements
included in the logged MDT report comprises of measurements from the same RAT type (serving cell measurements,
intra-frequency and inter-frequency neighbor cell measurements) and different RAT types (inter-RAT neighbor cell
measurements).
Logging of MBSFN measurements is only applicable to E-UTRA.
5.1.1.1 Measurement configuration
Logged MDT measurements are configured with a MDT Measurement Configuration procedure, as shown in Figure
5.1.1.1-1.
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3GPP TS 37.320 version 16.2.0 Release 16 11 ETSI TS 137 320 V16.2.0 (2020-11)
(E-)UTRAN or
UE
NR
LoggedMeasurementConfiguration


Figure 5.1.1.1-1: MDT measurement configuration for Logged MDT
Network initiates the procedure to UE in RRC Connected by sending LoggedMeasurementConfiguration message,
which is used to transfer configuration parameters for Logged MDT. This is a unidirectional RRC signalling procedure.
A release operation for logged measurement configuration in the UE is realized only by configuration replacement
when the configuration is overwritten or by configuration clearance in case a duration timer stopping or expiration
condition is met.
5.1.1.1.1 Configuration parameters
The logged measurement configuration consists of:
- configuration of downlink pilot strength measurements logging for (E-)UTRA and NR.
- configuration of MBSFN measurement logging for E-UTRA.
- configuration of the triggering of logging events:
- for (E-)UTRAN only periodic measurement trigger is supported, for which the logging interval is
configurable. The parameter specifies the periodicity for storing MDT measurement results. It should be
configured in seconds in multiples of the applied IDLE mode DRX, i.e. multiples of 1.28s which is either a
factor or multiple of the IDLE mode DRX. The UE behaviour is unspecified when the UE is configured with
a DRX cycle larger than the logging interval.
- for NR:
- periodic measurement trigger is supported, for which the logging interval is configurable. The parameter
specifies the periodicity for storing MDT measurement results.
- event-based trigger is supported, for which the logging interval is configurable, which determines
periodical logging of available data (e.g. time stamp, location information), and following two types of
events are supported:
- measurement quantity-based event L1, for which the event threshold and time to trigger are
configurable;
- out-of-coverage detection trigger.
NOTE: The logging configuration for event-based and periodical DL pilot strength logged measurements can be
configured independently. Only one type of event can be configured to the UE.
- configuration of the logging duration. This configuration parameter defines a timer activated at the moment of
configuration, that continues independent of state changes, RAT or RPLMN change. When the timer expires the
logging is stopped and the configuration is cleared (except for the parameters that are required for further
reporting e.g. network absolute
...