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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 15.0.0 Release 15)
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3GPP TS 37.320 version 15.0.0 Release 15 1 ETSI TS 137 320 V15.0.0 (2018-07)
Reference
RTS/TSGR-0237320vf00
Keywords
LTE,UMTS
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ETSI
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3GPP TS 37.320 version 15.0.0 Release 15 2 ETSI TS 137 320 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
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
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server) which are, or may be, or may become, essential to the present document.
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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 37.320 version 15.0.0 Release 15 3 ETSI TS 137 320 V15.0.0 (2018-07)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 4
1 Scope . 5
2 References . 5
3 Definitions, symbols and abbreviations . 6
3.1 Definitions . 6
3.2 Symbols . 6
3.3 Abbreviations . 6
4 Main concept and requirements . 8
4.1 General . 8
5 Functions and procedures . 9
5.1 General procedures . 9
5.1.1 Logged MDT procedures . 9
5.1.1.1 Measurement configuration. 9
5.1.1.1.1 Configuration parameters . 9
5.1.1.1.2 Configuration effectiveness . 10
5.1.1.2 Measurement collection . 11
5.1.1.3 Measurement reporting . 12
5.1.1.3.1 Availability Indicator . 12
5.1.1.3.2 Report retrieval . 12
5.1.1.3.3 Reporting parameters . 13
5.1.1.4 MDT context handling during handover . 14
5.1.2 Immediate MDT procedures . 15
5.1.2.1 Measurement configuration . 15
5.1.2.2 Measurement reporting . 15
5.1.2.3 MDT context handling during handover . 15
5.1.3 MDT Initiation . 15
5.1.4 UE capabilities . 16
5.1.5 Void . 16
5.1.6 Accessibility measurements . 16
5.2 E-UTRAN solutions . 17
5.2.1 RRC_CONNECTED . 17
5.2.1.1 Measurements and reporting triggers for Immediate MDT . 17
5.2.1.2 Enhancementto Radio Link Failure report . 18
5.2.1.3 Detailed Location Information . 19
5.2.2 RRC_IDLE . 19
5.3 UTRAN solutions . 19
5.3.1 UTRA RRC Connected . 19
5.3.1.1 Measurements and reporting events for Immediate MDT . 19
5.3.1.2 Detailed Location Information . 20
5.3.2 UTRA Idle . 20
Annex A (informative): Coverage use cases . 21
Annex B (informative): QoS verification use cases . 22
Annex C (informative): Measurements . 23
Annex D (informative): MBSFN use cases . 24
Annex E (informative): Change history . 25
History . 28
ETSI
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3GPP TS 37.320 version 15.0.0 Release 15 4 ETSI TS 137 320 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 37.320 version 15.0.0 Release 15 5 ETSI TS 137 320 V15.0.0 (2018-07)
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 and E-UTRAN.
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".
ETSI
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3GPP TS 37.320 version 15.0.0 Release 15 6 ETSI TS 137 320 V15.0.0 (2018-07)
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 eNB/RNC 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, 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 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
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
GNSS Global Navigation Satellite System
ETSI
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3GPP TS 37.320 version 15.0.0 Release 15 7 ETSI TS 137 320 V15.0.0 (2018-07)
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
OAM Operation and Maintenance
P-CCPCH Primary Physical Common Control CHannel
PCH Paging Channel
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
SRNC Serving RNC
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
ETSI
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3GPP TS 37.320 version 15.0.0 Release 15 8 ETSI TS 137 320 V15.0.0 (2018-07)
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. UE capability information
The network may use UE capabilities to select terminals for MDT measurements.
8. 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.
9. 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
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.
ETSI
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3GPP TS 37.320 version 15.0.0 Release 15 9 ETSI TS 137 320 V15.0.0 (2018-07)
5 Functions and procedures
5.1 General procedures
5.1.1 Logged MDT procedures
Support of Logged MDT complies with the principles for idle mode measurements in the UE specified in TS 25.133[2]
and TS 36.133 [3] 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, measurement collection and reporting of the concerning measurement will always
be done in cells of the same RAT type.
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.
UE (E-)UTRAN
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.
- configuration of MBSFN measurement logging for E-UTRA.
- configuration of the triggering of logging events. 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.
ETSI
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3GPP TS 37.320 version 15.0.0 Release 15 10 ETSI TS 137 320 V15.0.0 (2018-07)
- 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 time stamp, trace reference, trace recording session reference and TCE Id).
- network absolute time stamp to be used as a time reference to UE
- Trace Reference parameter as indicated by the OAM configuration as specified in TS 32.422 [6]
- Trace Recording Session Reference as indicated by the OAM configuration as specified in TS 32.422 [6]
- TCE Id as indicated by the OAM configuration as specified in TS 32.422 [6]
- MDT PLMN List, indicating the PLMNs where measurement collection and log reporting is allowed. It is either
the Management Based MDT PLMN List or the Signalling Based MDT PLMN List, depending on how the
Logged MDT task was initiated (see 5.1.3).
- (optionally) configuration of a logging area. A UE will log measurements as long as it is within the configured
logging area. The scope of the logging area may consist of one of:
- a list of up to 32 global cell identities. If this list is configured, the UE will only log measurements when
camping in any of these cells
- a list of up to 8 TAs or 8 LAs or 8 RAs. If this list is configured, the UE will only log measurements when
camping in any cell belonging to the preconfigured TA/LA/RAs.
- The configured logging area can span PLMNs in the MDT PLMN List. If no area is configured, the UE will log
measurements throughout the PLMNs of the MDT PLMN list.
- (optionally) configuration of target MBSFN area(s) for MBSFN measurement logging. If target MBSFN area(s)
is configured, UE applies it in addition to other restrictions such as the logging area. The UE will log
measurements as long as it receives MBMS service from an indicated target MBSFN area and is within the
configured logging area. The target MBSFN area(s) is defined by a list of up to 8 entries, where each entry
indicates a carrier frequency and optionally indicates a specific MBSFN area on a carrier frequency.
- (optionally) configuration of the WLAN measurements, indicating the UE to attempt to obtain WLAN
measurements.
- (optionally) configuration of the Bluetooth measurements, indicating the UE to attempt to obtain Bluetooth
measurements.
5.1.1.1.2 Configuration effectiveness
The logged measurement configuration is provided in a cell by dedicated control while UE is in CONNECTED and
implies:
- logged measurement configuration for downlink pilot strength measurements logging is active
- in IDLE UE state in E-UTRAN, or
- in IDLE mode, CELL_PCH and URA_PCH states in UTRAN, or
- in CELL_FACH state when second DRX cycle is used in UTRAN
- until logging duration timer expires or stops
- logged measurement configuration for MBSFN measurement logging is active
- in IDLE and CONNECTED UE states in E-UTRAN
- until logging duration timer expires or stops
- logged measurement configuration and logs are maintained when the UE is in any state as described above,
despite multiple periods interrupted by UE state transitions, e.g. for downlink pilot strength measurements when
the UE is in CONNECTED state for E-UTRAN and CELL_DCH, CELL_FACH state when second DRX cycle
is not used in UTRAN
ETSI
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