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5 Assumptions and study parameters
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5.1 GNSS availability scenarios
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5.2 System assumptions
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5.3 Evaluation scenarios and parameters
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6 Evaluation of GNSS unavailability impacts
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6.1 Impact on synchronization in initial access
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6.2 Impact on synchronization in connected mode
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7 Evaluation of solutions for GNSS resilient NR-NTN
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7.1 Potential solutions for GNSS-Resilient NR-NTN
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7.2 Evaluation of solutions
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7.3 Impact on specifications and RAN WGs
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8 Conclusions and recommendations
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8.1 Summary of findings
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8.2 Open issues and future work
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8.3 Recommendations for normative work
Annex <F> (informative): Change history Change history Date Meeting TDoc CR Rev Cat Subject/Comment New version 2025-11 RAN1#123 R1-2508479 TR skeleton for study on GNSS (Global Navigation Satellite System) resilient NR-NTN (Non-Terrestrial Networks) operation 0.0.1
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1 Scope
The present document is a technical report for Over-the-Air (OTA) test methods for NR NTN above 10GHz. This TR targets to define a full set of OTA test methods to cover different NTN UE types of operation above 10GHz.
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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 38.101-5: " NR; User Equipment (UE) radio transmission and reception; Part 5: Satellite access Radio Frequency (RF) and performance requirements". … [x] <doctype> <#>[ ([up to and including]{yyyy[-mm]|V<a[.b[.c]]>}[onwards])]: "<Title>".
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3 Definitions of terms, symbols and abbreviations
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3.1 Terms
For the purposes of the present document, the terms 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]. Definition format (Normal) <defined term>: <definition>. example: text used to clarify abstract rules by applying them literally.
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3.2 Symbols
For the purposes of the present document, the following symbols apply: Symbol format (EW) <symbol> <Explanation>
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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]. Abbreviation format (EW) <ABBREVIATION> <Expansion>
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4 General
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4.1 Device types
<Editor’s note: Detailed structure of the subclause is TBD. >
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4.2 Testing configuration
<Editor’s note: Detailed structure of the subclause is TBD. >
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4.3 Testing bands
<Editor’s note: Detailed structure of the subclause is TBD. >
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5 Performance metrics
<Editor’s note: This clause is not new metric, but just general explanation of performance metric for RF/RRM/Demod, which is highly related to test method and procedure>
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5.1 General definition of UE RF metrics
<Editor’s note: Detailed structure of the subclause is TBD. Including at least EIRP, EIS, TRP, TRS>
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5.2 General definition of UE RRM metrics
<Editor’s note: Detailed structure of the subclause is TBD. >
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5.3 General definition of UE Demodulation metrics
<Editor’s note: Detailed structure of the subclause is TBD. >
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6 NTN UE positioning guidelines
<Editor’s note: Detailed structure of the subclause is TBD. >
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6.1 Free space
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7 UE RF testing methodologies
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7.1 General
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7.2 Applicability of different test methods
<Editor’s note: general applicability of different test methods for each RF requirements>
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7.3 Indirect far field (IFF)
<Editor’s note: need sub-clauses,> 7.4 other <Editor’s note: need sub-clauses,>
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8 UE RRM testing methodologies
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8.1 General
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8.2 Applicability of different test methods
<Editor’s note: general applicability of different test methods for each RF requirements. Other methods can be further added, if needed>
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8.2 Indirect far field (IFF)
<Editor’s note: need sub-clauses,>
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9 UE demodulation testing methodologies
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9.1 General
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9.2 Measurement setup
<Editor’s note: test setup. >
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9.3 Test metrics and procedure
<Editor’s note: need sub-clauses > Annex A: UE coordinate system Annex B: Estimation of Measurement uncertainty <Editor’s note: Detailed structure of the subclause is TBD. > B.1 General B.2 MU assessment for UE RF testing B.3 MU assessment for UE RRM testing B.4 MU assessment for UE Demodulation testing Annex C: Environmental requirements <Editor’s note: Detailed structure of the subclause is TBD. Normal condition> Annex X (informative): Change history Change history Date Meeting TDoc CR Rev Cat Subject/Comment New version 2025-10 RAN4#116bis R4-2514843 Initial Skeleton (endorsement) 2025-11 RAN4#117 R4-2520725 TR skeleton 0.0.1