R1-2600026
discussion
On remaining aspects of 6GR evaluations
From Nokia
Summary
The document presents Nokia's positions on remaining evaluation assumptions for 6GR, covering four traffic models (extended FTP3, bi-directional traffic, eXR haptics, IoT) and several evaluation parameters (UE antenna, CPE/FWA, power levels, noise figure). It contains 2 observations and 24 proposals addressing traffic model simplification, antenna configurations, transmit power clarifications, and FWA-specific deployment assumptions.
Position
Nokia proposes a simplified extended FTP3 traffic model limited to two file sizes (X=2, Y=X=2) with arrival rates linked by a parameter K (λ₁=K·λ₂) targeting specific RB utilization load levels, and explicitly opposes embedding L1/L2 processing latencies, HARQ processing, or TTI size assumptions within the traffic model definition. They require at least one closed-loop bi-directional traffic model using TCP CUBIC with explicit UL TCP-ACK transmission simulated over the RAN plus a fixed 5 ms one-way CN delay. For UE antenna modelling, Nokia proposes specific candidate antenna location baselines—locations (4, 8) for 1T2R Configuration 1 and locations (1, 3, 5, 7) for 4-element Configuration 2—and requires the new Rel-19 directive antenna model (Alt 2) as default for handheld UE SLSs while clarifying that Alt 1 legacy modelling implies isotropic radiation patterns. They present a detailed CPE/FWA framework including multiple antenna radiation patterns (isotropic, directional with specific HPBW/gain values, omnidirectional), support for CPE power classes at 35 dBm with peak EIRP ≤43 dBm, and prequalification techniques for FWA deployments. On BS Tx power, Nokia questions the consistency of Option 2 values across bands and demands either removal of BW-scaling-only options or designation of Option 1 as default.
Key proposals
- Proposal 1 (Sec 2.1): RAN1 to define FTP3 extension with two file sizes (X=2), per-UE traffic generated with both sizes (X=Y=2), and a parameter K expressing arrival rate ratio λ₁=K·λ₂ with independent Poisson processes.
- Proposal 1 (Sec 2.2): RAN1 to include at least one closed-loop (bi-directional) traffic model into the 6GR study, such as modeling existing XR model with realistic TCP ACK feedback.
- Proposal 1 (Sec 2.3): Existing Video cases at 10/20 Mbps with PDB of 30ms, plus motion/control at 200 kbps with 10 ms PDB and 100-byte payloads, are sufficient for 6GR studies; a-synchronicity of QoS flows is mainly a RAN WG2 topic.
- Proposal 1 (Sec 2.4): Should there be a need to introduce more traffic models for IoT/massive communication, focus solely on Autonomous reporting.
- Proposal 1 (Sec 3.1): RAN1 to select UE candidate antenna locations (4, 8) as baseline for Configuration 1 (1T2R), Alt 2, to better support antenna blockage spatial non-stationarity modelling below 1 GHz.
- Proposal 2 (Sec 3.1): RAN1 to select UE candidate antenna locations (1, 3, 5, 7) already calibrated in TR 38.901 as baseline for Configuration 2 (4 antenna elements), Alt 2.
- Proposal 5 (Sec 3.1): RAN1 should use the new directive antenna model described in section 7.3 of Rel-19 version of TR 38.901 (Alt 2) for UE handheld devices by default for SLSs in 6GR study.
- Proposal 1 (Sec 3.1.1): RAN1 to define isotropic, directional (with varying HPBW and gains per Table 4), and omnidirectional (per Table 5) antenna radiation patterns for CPE devices with 4, 8, and 16 antenna elements.
- Proposal 1 (Sec 3.2.1): RAN1 supports power classes for CPE with maximum transmit power of 35 dBm and peak EIRP not exceeding 43 dBm.
- Proposal 2 (Sec 3.2.2): RAN1 either to remove BS Tx power options reflecting only BW scaling or at least to indicate Option 1 as default.
- Proposal 1 (Sec 3.3): Main 6G deployment scenarios should include FWA specific assumptions such as outdoor CPE antenna heights 1m above rooftop, specific CPE distributions, and prequalification techniques.
- Proposal 1 (Sec 3.4): RAN1 to consider 30 and up to 50 UEs per TRxP to evaluate gains of 6GR features such as MU-MIMO.
- Proposal 2 (Sec 3.4): RAN1 to consider UE noise figure equal to 7 dB around 7 GHz and below for 6GR evaluations aligned with ITU IMR-2030 requirements.
- Proposal 4 (Sec 2.2): Default assumptions for simulation with TCP functionality shall be agreed; suggestion is to rely on TCP CUBIC.
- Proposal 6 (Sec 3.1): RAN1 to clarify that if Alt 1 legacy UE antenna modelling is considered for handheld devices (M,N,P,Mg,Ng; Mp,Np) then isotropic antenna radiation pattern is assumed.