R1-2509386
discussion
FLS#2 on evaluation assumptions for 6GR air interface
From Huawei
Summary
This Huawei-moderated 3GPP RAN1#123 summary document (FLS#2 on 6G evaluation assumptions) captures round 1 and round 2 proposals across antenna modeling, system-level simulation (SLS) parameters, and five major traffic model areas, totaling approximately 35 formal proposals. It consolidates multi-company views on BS/UE antenna configurations for frequencies from 700MHz to 30GHz, SLS layouts and power assumptions, and new traffic models for AI/ML, immersive communications, multi-packet FTP, bidirectional flows, and IoT.
Position
Huawei moderates this FLS summary capturing multi-company convergence on 6G evaluation assumptions. For antenna modeling, they propose specific (M,N,P,Mg,Ng;Mp,Np) tuple updates for 700MHz/2GHz/7GHz BS configurations and introduce 15GHz BS modeling with analog/hybrid beamforming options. For UE antennas, they structure a 5-combination framework from 1T2R to 32T32R under two alternatives (UPA tuples vs. TR 38.901 handheld model), and propose that the maximum number of UE antenna elements should at least consider 16. For SLS, they specify multi-option BS transmit power per frequency/scenario (e.g., 43-49dBm/20MHz for 7GHz Urban Macro) and UE powers (23/26/29dBm below 7GHz with CPE/FWA at 31dBm). In traffic models, they propose a token-parameterized AI/ML model where Token success rate directly reflects service quality and cannot be replaced by packet success rate, oppose premature definition of bidirectional TCP-based traffic flow modeling citing insufficient justification, and support extending FTP Model 3 for PDB with packet dropping and multi-packet-size support. For link budget, they advocate using Maximum Path Loss (MPL) as the basic coverage metric and propose Candidate 1 template updates including SNR-to-target-data-rate linkage.
Key proposals
- Proposal 2.1.2-1 (Sec 2.1.2): Updating BS antenna (M,N,P,Mg,Ng; Mp,Np) tuples for 700MHz (to 8,4,2,1,1;1,4), 2GHz outdoor (to 8,2,2,1,1;1,2), and 7GHz outdoor combinations 1 and 3 (to 24,16,2,1,1;4,16 and 48,16,2,1,1;8,16).
- Proposal 2.1.2-2 (Sec 2.1.2): Proposing RAN1 consider BS antenna modeling for around 15GHz carrier frequency with specific indoor/outdoor combinations (e.g., indoor 128AE/64TXRU and 128AE/8TXRU; outdoor 2048AE/256TXRU and 2048AE/16TXRU).
- Proposal 2.2.2 (Sec 2.2.2): Defining UE antenna modeling via two alternatives: Alt 1 using (M,N,P,Mg,Ng; Mp,Np) tuples and Alt 2 using handheld device antenna model with candidate locations from TR 38.901 section 7.3, spanning 5 combination levels from 1T2R to 32T32R.
- Proposal 3.1.2 (Sec 3.1.2): Assuming layout for system-level simulation with single-layer hex grids for Rural/Suburban, two-layer (macro hex + micro random drop) for Dense Urban/Urban Macro, and indoor floor (120m×50m) for Indoor Hotspot.
- Proposal 3.2.2-1 (Sec 3.2.2): Specifying total transmit power per BS per deployment scenario and carrier frequency (e.g., Indoor Hotspot at 2/4/7GHz: 24dBm/20MHz; Urban Macro at 7GHz: Option1 49dBm, Option2 43dBm, Option3 46dBm per 20MHz with 33dBm micro layer).
- Proposal 3.2.2-2 (Sec 3.2.2): Specifying UE power class per frequency (e.g., ≤7GHz: 23dBm and 26dBm TDD with 29dBm optional; ≤15GHz: 23/26/29dBm with EIRP ≤43dBm).
- Proposal 3.3.2 (Sec 3.3.2): Specifying UE distribution and speed (e.g., Indoor Hotspot: 10 users/TRxP, 100% indoor 3km/h; Dense Urban: [10,30] users/TRxP, 80% indoor 3km/h, 20% outdoor 30km/h).
- Proposal 4.1.2 (Sec 4.1.2): Introducing a generic traffic model for AI/ML services parameterized by Token as minimum application-layer data unit, with packet size as integer multiple of token size, bursty Poisson packet arrival containing Type-1 and Type-2 packets of differing importance, PDB-based packet failure counting, and Token success rate metric.
- Proposal 4.2.2 (Sec 4.2.2): Defining two amended XR models for immersive communications: Model-1 (eXR without Haptics) extending TR 38.838 with immersive gaming parameters (100/300/500 Mbps data rate, 90/120 fps, 25% STD) and UL-heavy video uploading; Model-2 (eXR with Haptics) defining co-generated haptics packets with 12ms or 30ms PDB.
- Proposal 4.3.2-1 (Sec 4.3.2): Extending FTP Model 3 with Packet Delay Budget (PDB) — one PDB per traffic flow, candidate values {10ms, 100ms, 200ms, 300ms, 1000ms}, packets exceeding PDB are dropped and accounted in UE throughput alongside successfully transferred and unfinished packets.
- Proposal 4.3.2-2 (Sec 4.3.2): Extending FTP Model 3 for multiple packet sizes via Option1 ([2,3] independent traffic flows per UE with fixed (S,λ) corresponding to Low/Medium/Large loads) or Option2 (UEs categorized into [2,3] classes per cell with class-specific session/packet sizes and traffic fractions).
- Proposal 5.1.2 (Sec 5): Updating link budget template Candidate 1 by modifying Row(19) to link Required SNR to target data rate with Y% BLER, removing 'FFS' from Row(30) Maximum Range, adding Row(22bis-a) for MaxCL calculation from TR 38.913, and FFS on adding Row(3d) for RE power control dynamic range.
- Proposal 6.1.2 (Sec 6.1): Specifying Ku-band carrier frequency for NTN evaluations as 14GHz for UL and 11GHz for DL.
- Proposal 6.2.2 (Sec 6.2): Modeling satellite antenna as an array with TXRU virtualization Option-2B (full-connection model) from TR 36.897, Mg=Ng=1, virtualization matrix W including amplitude and phase, and Bessel function from 38.811 for simplified evaluations.
- Proposal 6.3.2 (Sec 6.3): Considering VLEO, LEO, and GEO satellite orbit types for 6GR NTN evaluations.