{ "schema_version": 1, "concept": "4I.2B", "title": "Applicability-gated ITU-R P.1411-13 candidate-model pre-change baseline", "artifact": "pre-change-baseline", "captured_at": "2026-09-18", "baseline_commit": "d66ad902075402a2df8df413bec63e9a51059561", "worktree_note": "The 4I.2A atmospheric reference and earlier canonical audit artifacts were already present. This artifact records the runtime state before adding the isolated P.1411 candidate evaluator, route, UI, and fixtures.", "real_backend_acceptance": { "command": "ATOM_REAL_E2E=1 ATOM_DATASET_DIR=/Users/berkunsal/Desktop/urban-ray-tracer/data-pipeline npm run test:e2e", "result": "27 passed, 9 skipped", "backend": "real Go backend on http://127.0.0.1:18080", "scope": "existing frontend real-backend acceptance suite before Concept 4I.2B production edits" }, "canonical_runtime_snapshots": { "canonical_2_6_ghz": { "endpoint": "POST /api/simulate", "request": { "tower_lon": 32.85, "tower_lat": 39.92, "rays": 8, "radius_m": 100, "frequency_ghz": 2.6, "tx_power_dbm": 30, "azimuth": 90, "beam_width": 360 }, "model_id": "urban_short_range", "stats": { "blocked_pct": 0, "avg_rx_dbm": -43, "min_range_m": 100, "max_range_m": 100 }, "first_feature": { "distance_m": 25, "path_loss_db": 70.07902264967872, "wall_loss_db": 0, "signal_dbm": -15.07902264967872, "propagation_model_id": "urban_short_range", "los_state": "los", "applicability_reason": "applicable" } }, "canonical_28_ghz": { "endpoint": "POST /api/simulate", "request": { "tower_lon": 32.85, "tower_lat": 39.92, "rays": 8, "radius_m": 100, "frequency_ghz": 28, "tx_power_dbm": 30, "azimuth": 90, "beam_width": 360 }, "model_id": "urban_short_range", "stats": { "blocked_pct": 12.5, "avg_rx_dbm": -72.1, "min_range_m": 72.3, "max_range_m": 100 }, "first_feature": { "distance_m": 25, "path_loss_db": 90.72271631710674, "wall_loss_db": 0, "signal_dbm": -35.722716317106745, "propagation_model_id": "urban_short_range", "los_state": "los", "applicability_reason": "applicable" } }, "research_sub_thz_140_ghz": { "endpoint": "POST /api/simulate", "request": { "tower_lon": 32.85, "tower_lat": 39.92, "rays": 8, "radius_m": 100, "frequency_ghz": 140, "tx_power_dbm": 30, "azimuth": 90, "beam_width": 360 }, "model_id": "research_sub_thz", "applied_model_id": "research_sub_thz", "applicability_reason": "research_profile_only", "stats": { "blocked_pct": 87.5, "avg_rx_dbm": -123.6, "min_range_m": 17.6, "max_range_m": 100 }, "first_feature": { "distance_m": 25, "slant_distance_m": 34.3110769286, "fspl_db": 106.08124770471235, "propagation_loss_db": 106.08124770471235, "wall_loss_db": 0, "signal_dbm": -51.081247704712354, "propagation_model_id": "research_sub_thz" }, "composition": "FSPL + max(wall_event_count, 0) * 80 dB at 140 GHz; no gas, rain, fog, material, diffraction, or measured channel term" } }, "existing_reference_snapshots": { "concept_4i2a_atmospheric_reference": { "endpoint": "POST /api/sub-thz-reference", "request": { "frequency_ghz": 140, "transmitter": {"lon": 32.85, "lat": 39.92, "height_m": 25}, "receiver": {"lon": 32.8509, "lat": 39.92, "height_m": 1.5}, "atmosphere": {"enabled": true, "pressure_hpa": 1013.25, "temperature_k": 288.15, "water_vapour_density_g_m3": 7.5}, "rain": {"enabled": true, "rain_rate_mm_h": 25, "polarization": "circular", "polarization_tilt_deg": 45}, "local_fog": {"enabled": true, "liquid_water_density_g_m3": 0.5, "temperature_k": 288.15} }, "response": { "reference_model_id": "sub_thz_atmospheric_reference_v1", "horizontal_distance_m": 76.83830463717943, "slant_distance_m": 80.35157160576257, "fspl_db": 113.47023144742553, "gas_db": 0.0735577398480971, "rain_db": 1.0229000625292286, "local_fog_db": 0.27993683098088384, "total_path_loss_db": 114.84662608078375, "building_intersection_present": true, "wall_loss_applied": false, "diffraction_applied": false, "material_loss_applied": false, "canonical_network_model": false, "receiver_threshold_applied": false, "experiment_fingerprint": "sub-thz-reference-642d0170dd3558ee9c51034ffe0c6751e7113d42bd58195bdf44c517f22f5f64" }, "comparison_artifact": "concept-4i2a-post-change-comparison.json" }, "concept_4h2_optimizer": { "source": "concept-4f1-canonical-audit.json", "frequency_ghz": 28, "baseline_optimizer": { "network_score": 13509330.8, "pareto_frontier_size": 23 }, "height_aware_optimizer": { "network_score": 32568641.1, "pareto_frontier_size": 23, "elapsed_seconds": 18.484 }, "use": "invariance target only; not recomputed or coupled to P.1411" }, "p526_diffraction": { "source": "concept-4i2a-pre-change-baseline.json", "endpoint": "POST /api/path-profile", "diagnostic_id": "p526-single-edge-v1", "baseline_model": "free_space", "diffraction_loss_db": null, "canonical_path_loss_db": 118.58, "use": "invariance target only; P.1411 never invokes this diagnostic" } }, "invariance_targets": [ "canonical 2.6 GHz simulation", "canonical 28 GHz simulation", "research_sub_thz 140 GHz simulation", "4H.2 disabled optimization", "4H.2 enabled optimization", "building entry", "P.526 diffraction diagnostic", "4H.1 interference/radio-quality", "4I.2A atmospheric reference" ], "planned_4i2b_boundary": { "new_route": "POST /api/sub-thz-p1411-reference", "new_model_ids": [ "p1411_below_rooftop_los_v1", "p1411_urban_highrise_nlos_v1", "p1411_urban_lowrise_nlos_v1" ], "canonical_dispatch_modified": false, "canonical_network_coupling": false, "composition_policy": "P.1411 median and P.525 comparison are side-by-side reference outputs; P.676/P.838/P.840 and research_sub_thz remain optional alternative comparisons and are never summed into the P.1411 result" } }