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TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
Automatic Neighbour Relation (ANR)
for UTRAN;
Stage 2
(3GPP TS 25.484 version 15.0.0 Release 15)
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3GPP TS 25.484 version 15.0.0 Release 15 1 ETSI TS 125 484 V15.0.0 (2018-07)
Reference
RTS/TSGR-0325484vf00
Keywords
UMTS
ETSI
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ETSI
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3GPP TS 25.484 version 15.0.0 Release 15 2 ETSI TS 125 484 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
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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 25.484 version 15.0.0 Release 15 3 ETSI TS 125 484 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 . 5
3.1 Definitions . 5
3.2 Symbols . 5
3.3 Abbreviations . 6
4 Automatic Neighbour Relation Function, Main Concepts . 6
4.1 General . 6
4.2 ANR Handling in the UTRAN Infrastructure - Overall Description . 7
4.2.1 Iur Connectivity exists between the involved RNCs . 7
4.2.1.1 ANR Report over Uu for UTRAN cells . 7
4.2.1.2 ANR Report over Iur for UTRAN cells . 8
4.2.1.3 ANR Report over Iur for IRAT cells. 10
4.2.2 Iur Connectivity does not exist between some RNCs involved in ANR . 11
4.2.2.1 ANR report over Uu for UTRAN cells . 11
4.2.3 ANR Report over Uu for IRAT cells - with and without Iur . 12
5 Functions and Procedures . 13
5.1 ANR Management . 14
5.1.1 ANR Report Forwarding . 14
5.1.2 ANR Report Distribution Controlling. 14
5.2 Neighbour Cell Configuration . 14
5.2.1 Neighbour Cell Configuration for Intra-RNS cells . 15
5.2.2 Neighbour Cell Configuration for Inter-RNS cells (with Iur) . 15
5.2.3 Neighbour Cell Configuration (without Iur) . 15
5.3 ANR Logging configuration. 15
5.3.1 Configuration parameters . 16
5.3.2 Configuration validity . 16
5.4 Measurement Collection . 17
5.5 Measurement Reporting . 17
5.6 UE Capabilities . 18
Annex A (informative): Change history . 19
History . 20
ETSI
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3GPP TS 25.484 version 15.0.0 Release 15 4 ETSI TS 125 484 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 25.484 version 15.0.0 Release 15 5 ETSI TS 125 484 V15.0.0 (2018-07)
1 Scope
The present document is a technical specification of the overall support of Automatic Neighbour Relation (ANR)
Function in UTRA.
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".
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].
Base UTRAN Cell: A cell in UTRAN for which a missing neighbour cell is detected.
Neighbour Cell: A cell in UTRAN, LTE or GSM/GERAN that is a neighbour cell to a Base UTRAN Cell.
Neighbour Cell Identifier (NCI): The identifier of a Neighbour Cell
Neighbour cell Relation (NR): Information that a Neighbour Cell, identified with NCI, is a neighbour to a Base
UTRAN Cell. NR is stored in the RNC controlling the Base UTRAN Cell.
Conceptual Neighbour Relation Functions: The ANR is described using a number of conceptual entities and
functions in the RNC: Neighbour Relation Table, Neighbour Relation Table Management Function, Neighbour
Removal Function and Neighbour Detection Function. These entities and functions are used for descriptive purpose
only and shall not be regarded as requirements on the implementation in RNC.
Receiving RNC: the RNC receiving the ANR report over Uu
Base RNC: the CRNC of the Base UTRAN Cell
Neighbour RNC: the CRNC of the Neighbour Cell in UTRAN
ANR-PLMN List: A list of PLMNs that is the RPLMN and the list of equivalent PLMNs for the UE at the point of
receiving ANR logging configuration.
ANR measurement: Physical measurements and reading of System Information towards detected cells outside NCL.
ANR logging: Storing of essential information of detected cell into UE internal ANR log, when one or more detected
cell satisfies ANR logging criteria.
3.2 Symbols
Void
ETSI
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3GPP TS 25.484 version 15.0.0 Release 15 6 ETSI TS 125 484 V15.0.0 (2018-07)
3.3 Abbreviations
For the purposes of the present document, the abbreviations given in TR 21.905 [1] apply.
4 Automatic Neighbour Relation Function, Main
Concepts
4.1 General
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Neighbour
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Cell Information
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Figure 4.1-1: Interaction between RNC and O&M due to ANR
The ANR function resides in the RNC and is composed of the Neighbour Relation Table (NRT) Management Function,
Neighbour Detection Function and Neighbour Removal Function.
The Neighbour Detection Function detects new neighbours and adds them to the NRT. The Neighbour Removal
Function removes outdated NRs.
ETSI
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3GPP TS 25.484 version 15.0.0 Release 15 7 ETSI TS 125 484 V15.0.0 (2018-07)
A Neighbour cell Relation (NR) between a Base UTRAN Cell and a Neighbour Cell exists if the RNC controlling the
Base UTRAN Cell:
a) Knows the following Neighbour Cell information:
- Neighbour cell is in UTRAN: PLMN-Id, Cell Identifier(C-ID), RNC-ID/Extended RNC-ID,
- Neighbour cell is in LTE: ECGI (PLMN Id + Cell Identity)
- Neighbour cell is in GSM/GERAN: PLMN Id, LAC, CI, BSIC
b) Has an entry in the Neighbour Relation Table for the Base UTRAN Cell identifying the neighbour cell.
c) Has all required attributes defined in the Neighbour Relation Table entry or set to default values. Among these
attributes are the frequency information (UARFCN, BCCH ARFCN, EARFCN) and handover routing
parameters not already considered in (a):
- Neighbour cell is in UTRAN: LAC and RAC
- Neighbour cell is in LTE: TAI
For each NR, the NRT contains the Neighbour Cell Identifier (NCI), which identifies the neighbour cells. A neighbour
cell may be a UTRAN, LTE or GSM cell. Furthermore, each NR has two attributes, the No Remove and the No HO
attributes. These attributes have the following definitions:
- No Remove: If checked, the RNC shall not remove the Neighbour cell Relation from the NRT.
- No HO: If checked, the Neighbour cell Relation shall not be used as a neighbour cell by Intra RNS, Inter RNS or
Inter RAT mobility functions in UTRAN.
The ANR function also allows O&M to manage the NRT. O&M can add and delete NRs. It can also change the
attributes of the NR. The O&M system is informed about changes in the NRT.
4.2 ANR Handling in the UTRAN Infrastructure - Overall
Description
If UTRAN ANR functionality is supported in UTRAN, RNC shall be able to configure the UE to perform the ANR
measurement. ANR capable UE performs the ANR measurement and records in its logbook newly detected cells which
meet the criteria given in the configuration. The Receiving RNC uses RRC signalling to retrieve the ANR report over
the Uu interface after the UE has indicated that it has a logged ANR report. The Receiving RNC handles the ANR
report and may forward the ANR report to different RNCs.
This chapter illustrates the handling and message sequences to be used to configure a new neighbour relation for a
UTRAN cell.
4.2.1 Iur Connectivity exists between the involved RNCs
The ANR function supports forwarding of ANR reports from the Receiving RNC to RNCs indicated as Base RNCs in
the ANR report. Furthermore the ANR function supports suspension (and resuming) ANR logs reporting over Iur from
other RNCs as described in 5.1.2. This chapter describes the handling in the Receiving, Base and Neighbour RNCs
when Iur connectivity exists between the involved RNCs.
4.2.1.1 ANR Report over Uu for UTRAN cells
When receiving an ANR report over Uu, the Receiving RNC uses the globally unique cell identities in the report to
determine the network addresses of the RNCs that are controlling the Base UTRAN cells. The network address of this
Base RNC is retrieved using configuration in the Receiving RNC and/or O&M.
The Receiving RNC decides the necessity to forward the ANR report. If the Base UTRAN Cell is under control of the
Receiving RNC, the Receiving RNC terminates the relevant ANR report entry, and may update the Neighbouring
Relation accordingly. Otherwise, the ANR report is forwarded to the Base RNCs over Iur with the RNSAP Direct
Information Transfer procedure.
ETSI
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3GPP TS 25.484 version 15.0.0 Release 15 8 ETSI TS 125 484 V15.0.0 (2018-07)
If newly detected neighbour cells are controlled by another RNC the RNSAP Information Exchange Initiation
procedure is used to request cell information from the neighbour RNC. In addition the Base RNC may interact with
O&M before a neighbour relation is stored in the NRT.
Figure 4.2.1.1-1 ANR Report over Uu for UTRAN cells
4.2.1.2 ANR Report over Iur for UTRAN cells
On reception of an ANR report from another RNC using the RNSAP Direct Information Transfer procedure, the Base
RNC uses the globally unique cell identities and L1 information in the ANR report, and optionally also configuration in
the RNC/O&M, to determine if the ANR report contains any potential neighbour cells. If any of these potential
neighbour cells is controlled by another RNC the RNSAP Information Exchange Initiation procedure may be used to
request cell information from the neighbour RNC. In addition the Base RNC may interact with O&M before a
neighbour relation is be stored in the NRT as shown in the figure below:
ETSI
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3GPP TS 25.484 version 15.0.0 Release 15 9 ETSI TS 125 484 V15.0.0 (2018-07)
Intra UMTS, Inter RNS, ANR report over Iur
RNC3
Iur RNC2
RNC1
Iur
(Role:
(Role:
(Role:
O&M
- Neighbour RNC)
- Base RNC)
- Receiving RNC)
RNSAP: DIRECT INFORMATION TRANSFER,
ANR report transparent:
(list NR:
- Cell-ID a -> Cell-ID b,
- Cell-ID c->Cell-ID d,
- Cell-ID e->Cell-ID f,.)
Role Base RNC:
RNC2 retreives its potential neighbours:
Cell information is needed for potential neighbours in RNC3
Address of RNC3 is retreived based on Cell-ID in ANR report
RNSAP: INFORMATION EXCHANGE
INITIATION REQUEST
(List: C-ID n, type=on demand)
RNSAP: INFORMATION EXCHANGE
INITIATION RESPONSE
(List: cell attributes)
Neighbour handling: RNC2 (C-ID m)-> RNC3 (C-ID n)
[implementation dependent]
Store UTRAN n
...