ETSI TS 136 455 V17.1.0 (2023-04)

LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); LTE Positioning Protocol A (LPPa) (3GPP TS 36.455 version 17.1.0 Release 17)

RTS/TSGR-0336455vh10

General Information

• Status: Not Published
• Technical Committee: 3GPP RAN 3 - lub specification, lur specification, lu specification and UTRAN & O&M
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Completion Date: 26-Apr-2023

Standards Content (Sample)

TECHNICAL SPECIFICATION
LTE;
Evolved Universal Terrestrial Radio Access (E-UTRA);
LTE Positioning Protocol A (LPPa)
(3GPP TS 36.455 version 17.1.0 Release 17)

3GPP TS 36.455 version 17.1.0 Release 17 1 ETSI TS 136 455 V17.1.0 (2023-04)

Reference
RTS/TSGR-0336455vh10
Keywords
LTE
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ETSI
3GPP TS 36.455 version 17.1.0 Release 17 2 ETSI TS 136 455 V17.1.0 (2023-04)
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ETSI
3GPP TS 36.455 version 17.1.0 Release 17 3 ETSI TS 136 455 V17.1.0 (2023-04)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 6
1 Scope . 7
2 References . 7
3 Definitions, symbols and abbreviations . 8
3.1 Definitions . 8
3.2 Symbols . 8
3.3 Abbreviations . 8
4 General . 9
4.1 Procedure specification principles . 9
4.2 Forwards and backwards compatibility . 9
4.3 Specification notations . 9
5 LPPa services . 10
5.1 LPPa procedure modules . 10
5.2 Parallel transactions . 10
6 Services expected from lower layer . 10
7 Functions of LPPa . 10
8 LPPa procedures . 11
8.1 Elementary procedures . 11
8.2 Location Information Transfer Procedures . 12
8.2.1 E-CID Measurement Initiation . 12
8.2.1.1 General . 12
8.2.1.2 Successful Operation . 12
8.2.1.3 Unsuccessful Operation . 13
8.2.1.4 Abnormal Conditions . 13
8.2.2 E-CID Measurement Failure Indication . 13
8.2.2.1 General . 13
8.2.2.2 Successful Operation . 13
8.2.2.3 Unsuccessful Operation . 13
8.2.2.4 Abnormal Conditions . 13
8.2.3 E-CID Measurement Report . 14
8.2.3.1 General . 14
8.2.3.2 Successful Operation . 14
8.2.3.3 Unsuccessful Operation . 14
8.2.3.4 Abnormal Conditions . 14
8.2.4 E-CID Measurement Termination . 14
8.2.4.1 General . 14
8.2.4.2 Successful Operation . 15
8.2.4.3 Unsuccessful Operation . 15
8.2.4.4 Abnormal Conditions . 15
8.2.5 OTDOA Information Exchange . 15
8.2.5.1 General . 15
8.2.5.2 Successful Operation . 15
8.2.5.3 Unsuccessful Operation . 16
8.2.5.4 Abnormal Conditions . 16
8.2.6 UTDOA Information Exchange . 16
8.2.6.1 General . 16
8.2.6.2 Successful Operation . 16
8.2.6.3 Unsuccessful Operation . 17
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8.2.6.4 Abnormal Conditions . 17
8.2.7 UTDOA Information Update . 17
8.2.7.1 General . 17
8.2.7.2 Successful Operation . 17
8.2.7.3 Unsuccessful Operation . 17
8.2.7.4 Abnormal Conditions . 18
8.3 Management Procedures . 18
8.3.1 Error Indication . 18
8.3.1.1 General . 18
8.3.1.2 Successful Operation . 18
8.3.1.3 Abnormal Conditions . 18
8.4 Assistance Information Transfer Procedures . 18
8.4.1 Assistance Information Control . 18
8.4.1.1 General . 18
8.4.1.2 Successful Operation . 19
8.4.1.3 Abnormal Conditions . 19
8.4.2 Assistance Information Feedback . 19
8.4.2.1 General . 19
8.4.2.2 Successful Operation . 19
8.4.2.3 Abnormal Conditions . 20
9 Elements for LPPa Communication . 20
9.0 General . 20
9.1 Message Functional Definition and Content . 20
9.1.1 Messages for Location Information Transfer Procedures . 20
9.1.1.1 E-CID MEASUREMENT INITIATION REQUEST . 20
9.1.1.2 E-CID MEASUREMENT INITIATION RESPONSE . 21
9.1.1.3 E-CID MEASUREMENT INITIATION FAILURE . 22
9.1.1.4 E-CID MEASUREMENT FAILURE INDICATION . 22
9.1.1.5 E-CID MEASUREMENT REPORT . 22
9.1.1.6 E-CID MEASUREMENT TERMINATION COMMAND . 23
9.1.1.7 OTDOA INFORMATION REQUEST . 23
9.1.1.8 OTDOA INFORMATION RESPONSE . 23
9.1.1.9 OTDOA INFORMATION FAILURE . 24
9.1.1.10 UTDOA INFORMATION REQUEST . 24
9.1.1.11 UTDOA INFORMATION RESPONSE . 25
9.1.1.12 UTDOA INFORMATION FAILURE . 25
9.1.1.13 UTDOA INFORMATION UPDATE . 25
9.1.2 Messages for Management Procedures . 25
9.1.2.1 ERROR INDICATION . 25
9.1.3 Messages for Assistance Information Transfer Procedures . 26
9.1.3.1 ASSISTANCE INFORMATION CONTROL . 26
9.1.3.2 ASSISTANCE INFORMATION FEEDBACK . 26
9.2 Information Element definitions . 26
9.2.0 General . 26
9.2.1 Cause . 26
9.2.2 Criticality Diagnostics . 28
9.2.3 Message Type . 28
9.2.4 LPPa Transaction ID . 29
9.2.5 E-CID Measurement Result . 29
9.2.6 ECGI . 30
9.2.7 OTDOA Cell Information . 30
9.2.8 E-UTRAN Access Point Position . 33
9.2.9 PRS Muting Configuration . 33
9.2.10 Requested SRS Transmission Characteristics . 34
9.2.11 UL Configuration . 34
9.2.12 Cell Portion ID . 36
9.2.13 Inter-RAT Measurement Result . 36
9.2.15 WLAN Measurement Result. 39
9.2.16 NPRS configuration . 39
9.2.17 NPRS Muting Configuration . 41
9.2.18 Offset of NB-IoT Channel Number to EARFCN . 41
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9.2.19 PRS Frequency Hopping Configuration . 41
9.2.20 Assistance Information . 42
9.2.21 PosSIB Segments . 42
9.2.22 Assistance Information Meta Data . 43
9.2.23 Positioning SIB Type . 43
9.2.24 Assistance Information Failure List . 44
9.2.25 TDD Configuration . 44
9.2.26 NR CGI . 45
9.3 Message and Information Element Abstract Syntax (with ASN.1) . 46
9.3.1 General . 46
9.3.2 Usage of Private Message Mechanism for Non-standard Use . 46
9.3.3 Elementary Procedure Definitions . 46
9.3.4 PDU Definitions . 51
9.3.5 Information Element definitions . 59
9.3.6 Common definitions . 77
9.3.7 Constant definitions . 78
9.3.8 Container definitions. 80
9.4 Message transfer syntax . 84
9.5 Timers . 84
10 Handling of unknown, unforeseen and erroneous protocol data . 84
Annex A (informative): Change History . 85
History . 87

ETSI
3GPP TS 36.455 version 17.1.0 Release 17 6 ETSI TS 136 455 V17.1.0 (2023-04)
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
3GPP TS 36.455 version 17.1.0 Release 17 7 ETSI TS 136 455 V17.1.0 (2023-04)
1 Scope
The present document specifies the control plane radio network layer signalling procedures between eNB and E-SMLC.
LPPa supports the concerned functions by signalling procedures defined in this document. LPPa is developed in
accordance with the general principles stated in TS 36.401 [2].
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 36.401:"Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Architecture
Description".
[3] 3GPP TS 36.413:"Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1
Application Protocol (S1AP)".
[4] ITU-T Recommendation X.691 (2002-07): "Information technology - ASN.1 encoding rules -
Specification of Packed Encoding Rules (PER) ".
[5] 3GPP TS 36.104:"Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Base Station
(BS) radio transmission and reception".
[6] 3GPP TS 36.211:"Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Physical
Channels and Modulation".
[7] 3GPP TS 23.032:"Technical Specification Group Services and System Aspects; Universal
Geographical Area Description (GAD)".
[8] 3GPP TS 36.133:"Evolved Universal Terrestrial Radio Access (E-UTRA); Requirements for
support of radio resource management".
[9] 3GPP TR 25.921 (version.7.0.0): "Guidelines and principles for protocol description and error
handling".
[10] 3GPP TS 36.331:"Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource
Control (RRC); Protocol specification".
[11] IEEE Std 802.11™-2012, IEEE Standard for Information technology - Telecommunications and
information exchange between systems - Local and metropolitan area network.
[12] 3GPP TS 36.213: "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer
procedures".
[13] 3GPP TS 36.355: "Evolved Universal Terrestrial Radio Access (E-UTRA); LTE Positioning
Protocol (LPP)".
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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].
Elementary Procedure: LPPa protocol consists of Elementary Procedures (EPs). An LPPa Elementary Procedure is a
unit of interaction between the eNB and the E-SMLC. An EP consists of an initiating message and possibly a response
message. Two kinds of EPs are used:
- Class 1: Elementary Procedures with response (success or failure),
- Class 2: Elementary Procedures without response.
Cell Portion: A geographical part of a cell. A cell portion is semi-static, and identical for both the UL and the DL.
Within a cell, a cell portion is uniquely identified by its Cell Portion ID.
Transmission Point (TP): A set of geographically co-located transmit antennas for one cell, part of one cell or one
PRS-only TP. Transmission Points can include base station (eNB) antennas, remote radio heads, a remote antenna of a
base station, an antenna of a PRS-only TP, etc. One cell can be formed by one or multiple transmission points. For a
homogeneous deployment, each transmission point may correspond to one cell.
PRS-only TP: A TP which only transmits PRS signals for PRS-based TBS positioning and is not associated with a cell.
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].
BSSID Basic Service Set IDentifier
CID Cell-ID (positioning method)
DL Downlink
E-CID Enhanced Cell-ID (positioning method)
eNB E-UTRAN NodeB
EP Elementary Procedure
EPC Evolved Packet Core
E-SMLC Evolved Serving Mobile Location Centre
E-UTRAN Evolved UTRAN
GNSS Global Navigation Satellite System
HESSID Homogeneous Extended Service Set IDentifier
IE Information Element
LCS LoCation Services
LPP LTE Positioning Protocol
LPPa LTE Positioning Protocol Annex
MME Mobility Management Entity
NW Network
OTDOA Observed Time Difference of Arrival
RSSI Received Signal Strength Indicator
S1AP S1 Application Protocol
SBAS Satellite-based Augmentation System
SRS Sounding Reference Signal
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SSID Service Set IDentifier
TP Transmission Point
UE User Equipment
UL Uplink
UTDOA Uplink Time Difference of Arrival
WLAN Wireless Local Area Network
4 General
4.1 Procedure specification principles
The principle for specifying the procedure logic is to specify the functional behaviour of the terminating eNB exactly
and completely. Any rule that specifies the behaviour of the originating eNB shall be possible to be verified with
information that is visible within the system.
The following specification principles have been applied for the procedure text in clause 8:
- The procedure text discriminates between:
1) Functionality which "shall" be executed
The procedure text indicates that the receiving node "shall" perform a certain function Y under a certain
condition. If the receiving node supports procedure X but cannot perform functionality Y requested in the
initiating message of a Class 1 EP, the receiving node shall respond with the message used to report
unsuccessful outcome for this procedure, containing an appropriate cause value.
2) Functionality which "shall, if supported" be executed
The procedure text indicates that the receiving node "shall, if supported," perform a certain function Y under
a certain condition. If the receiving node supports procedure X, but does not support functionality Y, the
receiving node shall proceed with the execution of the EP, possibly informing the requesting node about the
not supported functionality.
- Any required inclusion of an optional IE in a response message is explicitly indicated in the procedure text. If the
procedure text does not explicitly indicate that an optional IE shall be included in a response message, the
optional IE shall not be included. For requirements on including Criticality Diagnostics IE, see section 10.
4.2 Forwards and backwards compatibility
The forwards and backwards compatibility of the protocol is assured by a mechanism where all current and future
messages, and IEs or groups of related IEs, include ID and criticality fields that are coded in a standard format that will
not be changed in the future. These parts can always be decoded regardless of the standard version.
4.3 Specification notations
For the purposes of the present document, the following notations apply:
Procedure When referring to an elementary procedure in the specification the Procedure Name is written with
the first letters in each word in upper case characters followed by the word "procedure", e.g.
Handover Preparation procedure.
Message When referring to a message in the specification the MESSAGE NAME is written with all letters
in upper case characters followed by the word "message", e.g. ERROR INDICATION message.
IE When referring to an information element (IE) in the specification the Information Element Name
is written with the first letters in each word in upper case characters and all letters in Italic font
followed by the abbreviation "IE", e.g. Cause IE.
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Value of an IE When referring to the value of an information element (IE) in the specification the "Value" is
written as it is specified in sub clause 9.2 enclosed by quotation marks, e.g. "Value".
5 LPPa services
The present clause describes the services an eNB offers to the E-SMLC.
5.1 LPPa procedure modules
The procedures are divided into two modules as follows:
1. LPPa Location Information Transfer Procedures;
2. LPPa Management Procedures;
The LPPa Location Information Transfer Procedures module contains procedures used to handle the transfer of
positioning related information between eNB and E-SMLC.
The Management Procedures module contains procedures that are not related specifically to positioning, i.e. error
handling.
5.2 Parallel transactions
Unless explicitly indicated in the procedure specification, at any instance in time one protocol peer may have more than
one ongoing LPPa procedure.
6 Services expected from lower layer
Within E-UTRAN, LPPa protocol uses the services provided by the S1AP protocol. An LPPa message is carried inside

an S1AP message.
S1AP signalling is described in TS 36.413 [3].
7 Functions of LPPa
The LPPa protocol provides the following functions:
- E-CID Location Information Transfer. This function allows the eNB to exchange location information with the
E-SMLC for the purpose of E-CID positioning.
- OTDOA Information Transfer. This function allows the eNB to exchange information with the E-SMLC for the
purpose of OTDOA positioning.
- UTDOA Information Transfer. This function allows the eNB to exchange information with the E-SMLC for the
purpose of supporting UTDOA.
- Assistance Information Transfer. This function allows the E-SMLC to exchange information with the eNB for
the purpose of assistance information broadcasting.
- Reporting of General Error Situations. This function allows reporting of general error situations, for which
function specific error messages have not been defined.
The mapping between the above functions and LPPa EPs is shown in the table below.
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Table 7-1: Mapping between LPPa functions and LPPa EPs
Function Elementary Procedure(s)
E-CID Location Information Transfer a) E-CID Measurement Initiation
b) E-CID Measurement Failure Indication
c) E-CID Measurement Report
d) E-CID Measurement Termination
OTDOA Information Transfer OTDOA Information Exchange
UTDOA Information Transfer a) UTDOA Information Exchange
b) UTDOA Information Update
Assistance Information Transfer a) Assistance Information Control
b) Assistance Information Feedback
Reporting of General Error Situations Error Indication

8 LPPa procedures
8.1 Elementary procedures
In the following tables, all EPs are divided into Class 1 and Class 2 EPs.
Table 8.1-1: Class 1 Elementary Procedures
Elementary Initiating Message Successful Outcome Unsuccessful Outcome
Procedure Response message Response message
E-CID E-CID E-CID E-CID MEASUREMENT
Measurement MEASUREMENT MEASUREMENT INITIATION FAILURE
Initiation INITIATION REQUEST INITIATION
RESPONSE
OTDOA OTDOA OTDOA OTDOA INFORMATION
Information INFORMATION INFORMATION FAILURE
Exchange REQUEST RESPONSE
UTDOA UTDOA UTDOA UTDOA INFORMATION
Information INFORMATION INFORMATION FAILURE
Exchange REQUEST RESPONSE
Table 8.1-2: Class 2 Elementary Procedures
Elementary Procedure Initiating Message
E-CID Measurement Failure E-CID MEASUREMENT FAILURE
Indication INDICATION
E-CID Measurement Report E-CID MEASUREMENT REPORT
E-CID Measurement Termination E-CID MEASUREMENT
TERMINATION COMMAND
UTDOA Information Update UTDOA INFORMATION UPDATE
Error Indication ERROR INDICATION
Assistance Information Control ASSISTANCE INFORMATION
CONTROL
Assistance Information Feedback ASSISTANCE INFORMATION
FEEDBACK
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8.2 Location Information Transfer Procedures
8.2.1 E-CID Measurement Initiation
8.2.1.1 General
The purpose of E-CID Measurement Initiation procedure is to allow the E-SMLC to request the eNB to report E-CID
measurements used by E-SMLC to compute the location of the UE.
8.2.1.2 Successful Operation
eNB E-SMLC
E-CID MEASUREMENT INITIATION REQUEST
E-CID MEASUREMENT INITIATION RESPONSE

Figure 8.2.1.2-1: E-CID Measurement Initiation procedure, successful operation
The E-SMLC initiates the procedure by sending an E-CID MEASUREMENT INITIATION REQUEST message. If the
eNB is able to initiate the requested E-CID measurements, it shall reply with the E-CID MEASUREMENT
INITIATION RESPONSE message.
The Measured Results IE shall be included in the E-CID Measurement Result IE of the E-CID MEASUREMENT
INITIATION RESPONSE message when measurement results other than the "Cell-ID" have been requested.
If the Report Characteristics IE is set to "OnDemand", the eNB shall return the result of the measurement in the E-CID
MEASUREMENT INITIATION RESPONSE message including, if available, the E-UTRAN Access Point Position IE
in the E-CID Measurement Result IE, and the E-SMLC shall consider that the E-CID measurements for the UE has
been terminated by the eNB. If available, the eNB shall include the Cell Portion ID IE in the E-CID MEASUREMENT
INITIATION RESPONSE message. Upon reception of the Cell Portion ID IE, the E-SMLC may use the value as the
cell portion for the measurement. If the Report Characteristics IE is set to "OnDemand" and the Inter-RAT
Measurement Quantities IE is included in the E-CID MEASUREMENT INITIATION REQUEST message, the eNB
shall, if supported, provide the corresponding measurements, if available in the eNB, in the Inter-RAT Measurement
Result IE in E-CID MEASUREMENT INITIATION RESPONSE message. If the Report Characteristics IE is set to
"OnDemand" and the WLAN Measurement Quantities IE is included in the E-CID MEASUREMENT INITIATION
REQUEST message, the eNB shall, if supported, provide the corresponding measurements, if available in the eNB, in
the WLAN Measurement Result IE in E-CID MEASUREMENT INITIATION RESPONSE message.
If the Report Characteristics IE is set to "Periodic", the eNB shall initiate the requested measurements and shall reply
with the E-CID MEASUREMENT INITIATION RESPONSE message without including either the E-CID
Measurement Result IE or the Cell Portion ID IE in this message. The eNB shall then periodically initiate the E-CID
Measurement Report procedure for the measurements, with the requested reporting periodicity.
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8.2.1.3 Unsuccessful Operation

eNB E-SMLC
E-CID MEASUREMENT INITIATION REQUEST
E-CID MEASUREMENT INITIATION FAILURE

Figure 8.2.1.3-1: E-CID Measurement Initiation procedure, unsuccessful operation
If the eNB is not able to initiate at least one of the requested E-CID measurements, the eNB shall respond with an E-
CID MEASUREMENT INITIATION FAILURE message.
8.2.1.4 Abnormal Conditions
Void
8.2.2 E-CID Measurement Failure Indication
8.2.2.1 General
The purpose of the E-CID Measurement Failure Indication procedure is for the eNB to notify the E-SMLC that the E-
CID measurements previously requested with the E-CID Measurement Initiation procedure can no longer be reported.
8.2.2.2 Successful Operation
eNB E-SMLC
E-CID MEASUREMENT FAILURE INDICATION

Figure 8.2.2.2-1: E-CID Measurement Failure Indication, successful operation
Upon reception of the E-CID MEASUREMENT FAILURE INDICATION message, th
...