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TECHNICAL SPECIFICATION
5G;
NG-RAN;
NR Positioning Protocol A (NRPPa)
(3GPP TS 38.455 version 15.2.1 Release 15)
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3GPP TS 38.455 version 15.2.1 Release 15 1 ETSI TS 138 455 V15.2.1 (2019-04)
Reference
RTS/TSGR-0338455vf21
Keywords
5G
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3GPP TS 38.455 version 15.2.1 Release 15 2 ETSI TS 138 455 V15.2.1 (2019-04)
Intellectual Property Rights
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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 38.455 version 15.2.1 Release 15 3 ETSI TS 138 455 V15.2.1 (2019-04)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 5
1 Scope . 6
2 References . 6
3 Definitions, symbols and abbreviations . 6
3.1 Definitions . 6
3.2 Symbols . 7
3.3 Abbreviations . 7
4 General . 7
4.1 Procedure specification principles . 7
4.2 Forwards and backwards compatibility . 7
4.3 Specification notations . 7
5 NRPPa services . 8
5.1 NRPPa procedure modules . 8
5.2 Parallel transactions . 8
6 Services expected from lower layer . 8
7 Functions of NRPPa . 8
8 NRPPa procedures . 9
8.1 Elementary procedures . 9
8.2 Location Information Transfer Procedures . 9
8.2.1 E-CID Measurement Initiation . 9
8.2.1.1 General . 9
8.2.1.2 Successful Operation . 10
8.2.1.3 Unsuccessful Operation . 10
8.2.2 E-CID Measurement Failure Indication . 11
8.2.2.1 General . 11
8.2.2.2 Successful Operation . 11
8.2.2.3 Unsuccessful Operation . 11
8.2.3 E-CID Measurement Report . 11
8.2.3.1 General . 11
8.2.3.2 Successful Operation . 11
8.2.3.3 Unsuccessful Operation . 12
8.2.4 E-CID Measurement Termination . 12
8.2.4.1 General . 12
8.2.4.2 Successful Operation . 12
8.2.4.3 Unsuccessful Operation . 12
8.2.5 OTDOA Information Exchange . 12
8.2.5.1 General . 12
8.2.5.2 Successful Operation . 12
8.2.5.3 Unsuccessful Operation . 13
8.3 Management Procedures . 13
8.3.1 Error Indication . 13
8.3.1.1 General . 13
8.3.1.2 Successful Operation . 13
8.3.1.3 Abnormal Conditions . 13
9 Elements for NRPPa Communication . 14
9.0 General . 14
9.1 Message Functional Definition and Content . 14
9.1.1 Messages for Location Information Transfer Procedures . 14
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3GPP TS 38.455 version 15.2.1 Release 15 4 ETSI TS 138 455 V15.2.1 (2019-04)
9.1.1.1 E-CID MEASUREMENT INITIATION REQUEST . 14
9.1.1.2 E-CID MEASUREMENT INITIATION RESPONSE . 15
9.1.1.3 E-CID MEASUREMENT INITIATION FAILURE . 15
9.1.1.4 E-CID MEASUREMENT FAILURE INDICATION . 15
9.1.1.5 E-CID MEASUREMENT REPORT . 15
9.1.1.6 E-CID MEASUREMENT TERMINATION COMMAND . 16
9.1.1.7 OTDOA INFORMATION REQUEST . 16
9.1.1.8 OTDOA INFORMATION RESPONSE . 16
9.1.1.9 OTDOA INFORMATION FAILURE . 17
9.1.2 Messages for Management Procedures . 17
9.1.2.1 ERROR INDICATION . 17
9.2 Information Element definitions . 18
9.2.0 General . 18
9.2.1 Cause . 18
9.2.2 Criticality Diagnostics . 19
9.2.3 Message Type . 20
9.2.4 NRPPa Transaction ID . 20
9.2.5 E-CID Measurement Result . 20
9.2.6 NG-RAN CGI . 21
9.2.7 CGI EUTRA . 22
9.2.8 PLMN Identity . 22
9.2.10 NG-RAN Access Point Position . 22
9.2.11 TAC . 23
9.2.12 Cell Portion ID . 23
9.2.13 Other-RAT Measurement Result . 24
9.2.14 WLAN Measurement Result. 24
9.2.15 OTDOA Cell Information . 25
9.2.16 PRS Muting Configuration EUTRA . 27
9.2.17 PRS Frequency Hopping Configuration EUTRA . 27
9.2.18 TDD Configuration EUTRA. 28
9.3 Message and Information Element Abstract Syntax (with ASN.1) . 29
9.3.1 General . 29
9.3.2 Usage of Private Message Mechanism for Non-standard Use . 29
9.3.3 Elementary Procedure Definitions . 29
9.3.4 PDU Definitions . 33
9.3.5 Information Element definitions . 39
9.3.6 Common definitions . 51
9.3.7 Constant definitions . 52
9.3.8 Container definitions. 54
9.4 Message transfer syntax . 58
9.5 Timers . 58
10 Handling of unknown, unforeseen and erroneous protocol data . 58
Annex A (informative): Change history . 59
History . 60
ETSI
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3GPP TS 38.455 version 15.2.1 Release 15 5 ETSI TS 138 455 V15.2.1 (2019-04)
Foreword
This Technical Specification has been produced by the 3rd 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 38.455 version 15.2.1 Release 15 6 ETSI TS 138 455 V15.2.1 (2019-04)
1 Scope
The present document specifies the control plane radio network layer signalling procedures between a NG-RAN node
and the LMF. NRPPa supports the concerned functions by signalling procedures defined in this document.
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 38.413:"NG-RAN; NG Application Protocol (NGAP)".
[3] 3GPP TS 38.300: "NR; NR and NG-RAN Overall Description; Stage 2".
[4] 3GPP TS 38.413: "NG-RAN; NG Application Protocol (NGAP)".
[5] 3GPP TR 25.921 (version.7.0.0): "Guidelines and principles for protocol description and error
handling".
[6] ITU-T Recommendation X.691 (2002-07): "Information technology - ASN.1 encoding rules -
Specification of Packed Encoding Rules (PER) ".
[7] 3GPP TS 36.104: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Base
Station (BS) radio transmission and reception".
[8] 3GPP TS 23.032:"Technical Specification Group Services and System Aspects; Universal
Geographical Area Description (GAD)".
[9] 3GPP TS 36.133: "Evolved Universal Terrestrial Radio Access (E-UTRA); Requirements for
support of radio resource management".
[10] 3GPP TS 36.211:"Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Physical
Channels and Modulation".
[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 36.455: " Evolved Universal Terrestrial Radio Access (E-UTRA); LTE Positioning
Protocol A (LPPa)".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in 3GPP 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 3GPP
TR 21.905 [1].
NG-RAN node: as defined in TS 38.300 [3].
ng-eNB: as defined in TS 38.300 [3].
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3GPP TS 38.455 version 15.2.1 Release 15 7 ETSI TS 138 455 V15.2.1 (2019-04)
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 3GPP 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
3GPP TR 21.905 [1].
CID Cell-ID (positioning method)
E-CID Enhanced Cell-ID (positioning method)
LMF Location Management Function
OTDOA Observed Time Difference of Arrival
4 General
4.1 Procedure specification principles
The principle for specifying the procedure logic is to specify the functional behaviour of the terminating NG-RAN
Node exactly and completely. Any rule that specifies the behaviour of the originating NG-RAN Node 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.
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3GPP TS 38.455 version 15.2.1 Release 15 8 ETSI TS 138 455 V15.2.1 (2019-04)
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.
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 NRPPa services
The present clause describes the services an NG -RAN Node offers to the LMF.
5.1 NRPPa procedure modules
The procedures are divided into two modules as follows:
1. NRPPa Location Information Transfer Procedures;
2. NRPPa Management Procedures;
The NRPPa Location Information Transfer Procedures module contains procedures used to handle the transfer of
positioning related information between NG-RAN Node and LMF.
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 NRPPa procedure.
6 Services expected from lower layer
Within 5G RAN, NRPPa protocol uses the services provided by the NGAP protocol. An NRPPa message is carried
inside an NGAP message.
NGAP signalling is described in TS 38.413 [2].
7 Functions of NRPPa
The NRPPa protocol provides the following functions:
- E-CID Location Information Transfer. This function allows the NG-RAN node to exchange location information
with LMF for the purpose of E-CID positioning.
- OTDOA Information Transfer. This function allows the NG-RAN node to exchange information with the LMF
for the purpose of OTDOA positioning.
- 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 NRPPa EPs is shown in the table below.
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3GPP TS 38.455 version 15.2.1 Release 15 9 ETSI TS 138 455 V15.2.1 (2019-04)
Table 7-1: Mapping between NRPPa functions and NRPPa 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
Reporting of General Error Situations Error Indication
8 NRPPa 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
I
...