Content for TS 37.320 Word version: 18.2.0

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3.1 Definitions 3.2 Symbols 3.3 Abbreviations 4.1 General
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1 Scope p. 6

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 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.

2 References p. 6

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]

TR 21.905: "Vocabulary for 3GPP Specifications".

[2]

TS 25.133: "Requirements for support of radio resource management (FDD)".

[3]

TS 36.133: "Requirements for support of radio resource management (FDD)".

[4]

TS 25.331: "Radio Resource Control (RRC); Protocol specification".

[5]

TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification".

[6]

TS 32.422: "Subscriber and equipment trace; Trace control and configuration management".

[7]

TS 25.215: "Physical Layer; Measurements (FDD)".

[8]

TS 25.225: "Physical Layer; Measurements (TDD)".

[9]

TS 36.214: "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Layer; Measurements".

[10]

TS 36.321: "Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC); Protocol Specification".

[11]

TS 36.213: "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures".

[12]

TS 36.300: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access (E-UTRAN); Overall description; Stage 2".

[13]

TS 36.314: "Evolved Universal Terrestrial Radio Access (E-UTRA); Layer 2 - Measurements".

[14]

TS 25.321: "Medium Access Control (MAC) Protocol Specification".

[15]

TS 38.331: "NR; Radio Resource Control (RRC); Protocol specification".

[16]

TS 38.133: "NR; Requirements for support of radio resource management".

[17]

TS 28.552: "Technical Specification Group Services and System Aspects; Management and orchestration; 5G performance measurements".

[18]

TS 38.314: "NR; Layer 2 Measurements".

[19]

TS 38.215: "NR; Physical layer measurements".

[20]

TS 38.213: "NR; Physical layer procedures for control".

[21]

TS 38.321: "NR; Medium Access Control (MAC) protocol specification".

[22]

TS 38.300: "NR; NR and NG-RAN Overall description; Stage-2".

3 Definitions, symbols and abbreviations p. 7

3.1 Definitions p. 7

For the purposes of the present document, the terms and definitions given in TR 21.905 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 p. 7

For the purposes of the present document, the following symbols apply:

3.3 Abbreviations p. 7

For the purposes of the present document, the abbreviations given in TR 21.905 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.

ACK

Acknowledgement

AICH

Acquisition Indicator CHannel

BLER

Block Error Rate

BSSID

Basic Service Set Identifier

Carrier Aggregation

CDMA

Code Division Multiple Access

CHO

Conditional Handover

Core Network

CPICH

Common Pilot CHannel

DAPS

Dual Active Protocol Stack

DCH

Dedicated CHannel

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

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

Internet Protocol

ISCP

Interference on Signal Code Power

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

NPN

Non-Public Network

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

Power Headroom

PLMN

Public Land Mobile Network

PNI-NPN

Public Network Integrated Non-Public Network

Packet Switched

QCI

QoS Class Identifier

QoS

Quality of Service

Routing Area

RAB

Radio Access Bearer

RAT

Radio Access Technology

Radio Bearer

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

SNPN

Stand-alone Non-Public Network

SNR

Signal to Noise Ratio

SON

Self Organizing/Optimizing Network

SRB

Signalling Radio Bearer

SRNC

Serving RNC

SSB

Synchronization Signal Block

SSID

Service Set Identifier

Tracking Area

TCE

Trace Collection Entity

TDD

Time Division Duplex

User Equipment

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 p. 9

4.1 General p. 9

The general principles and requirements guiding the definition of functions for Minimization of drive tests are the following:

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.
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.
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.
Geographical scope of measurement logging
It is possible to configure the geographical area where the defined set of measurements shall be collected.
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.
Time information
The measurements in measurement logs shall be linked to a time stamp.
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.
UE capability information
The network may use UE capabilities to select terminals for MDT measurements.
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.
Dependency on TRACE
The subscriber/cell trace functionality is reused and extended to support MDT. If the MDT is initiated towards 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.

The solutions for MDT shall take into account the following constraints:

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.
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.