104 lines
3.4 KiB
Markdown
104 lines
3.4 KiB
Markdown
# Tick 27 — 2026-05-22 09:32 UTC
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**Thread:** R6.2.5 (multi-subject occupancy union)
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**Verdict:** Clean positive — **N=5 hits 100% coverage** for households of 1-4 occupants with chest-centric zones. N=4 knee returns. R6 family completes with this tick.
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## What shipped
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- `examples/research-sota/r6_2_5_multi_subject.py`
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- `examples/research-sota/r6_2_5_multi_subject_results.json`
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- `docs/research/sota-2026-05-22/R6_2_5-multi-subject-union.md`
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## Headline
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| Scenario | # zones | Coverage @ N=5 |
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|---|---:|---:|
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| 1 occupant | 1 | **100%** |
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| 2 occupants | 2 | **100%** |
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| 3 occupants | 3 | **100%** |
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| 4 occupants | 4 | **100%** |
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4-occupant saturation curve:
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| N | Coverage |
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|---:|---:|
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| 2 | 14.5% |
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| 3 | 72.9% |
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| **4** | **99.0%** ← knee |
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| 5 | 100% |
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**Knee at N=4** even for 4 occupants. The chest-centric small-zone approach generalises trivially.
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## Cross-eval: multi-subject optimisation matters
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| Placement | Coverage on 4 zones |
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|---|---:|
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| Single-subject-optimised | 70.6% |
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| **Multi-subject-optimised** | **100%** |
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| **Gain** | **+29.4 pp** |
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CLI must accept multiple `--target` args and compute union.
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## R6 family complete (9 ticks)
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| Tick | Config | Result |
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|---|---|---:|
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| R6.2 | 2D body, single | 51% N=5 |
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| R6.2.1 | 3D body, single | 26% N=2 |
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| R6.2.2 | 2D body, N-anchor | 97% N=5 |
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| R6.2.2.1 | 3D body, N-anchor | 49% N=5 |
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| R6.2.3 | 2D chest, single | 82% N=5 |
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| R6.2.4 | 3D chest, N-anchor | 77/82% N=5/6 |
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| **R6.2.5** | **2D chest, multi-subject** | **100% N=5** |
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**R6 family's ship recipe**: 2D chest-centric + multi-subject + N=5 = 100% coverage.
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## Why N=4 knee returns for multi-subject
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Each chest zone is 40×40 cm and fits inside one Fresnel ellipsoid (~40 cm wide at midpoint of 5 m link). N=4 anchors → 6 pairwise links → enough to cover 4 disjoint chest zones without much waste. Beyond N=4 the marginal gain drops to <1 pp.
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**Chest-centric multi-subject is the sweet spot for the Fresnel envelope geometry.**
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## Final R6.2 CLI surface (productisation spec)
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```
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wifi-densepose plan-antennas
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--room W H [Z] # 2D or 3D
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--target NAME X Y W H [DX DY DZ] # repeatable
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--target-mode {body, chest} # R6.2.3
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--freq-ghz F # 2.4, 5.0, 6.0
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--n-anchors N # auto-saturation if omitted
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--restarts K # 4 default
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```
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~50 LOC over the original R6.2.
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## Composes with prior threads
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- R6.2 / R6.2.3: direct extension (single → multi)
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- R6.2.2 / R6.2.4: same saturation behaviour
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- R14: V1/V2/V3 in households of 2-4 use this recipe
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- R3 / ADR-024: per-subject identity + multi-subject placement = full empathic-appliance stack
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- ADR-105/106/107: federation orthogonal to placement
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- R12 PABS: multi-subject coverage = multi-subject intrusion detection
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## Honest scope
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- 2D only (3D multi-subject is mechanical extension)
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- Static positions (real movement = conservative union)
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- Single 5×5 m geometry
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- Greedy + 4 restarts
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- 4 occupants; beyond may degrade
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## Coordination
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`ticks/tick-27.md`. No PROGRESS.md edit. Branch `research/sota-r6.2.5-multi-subject`.
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## Remaining loop work
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- R12.1: pose-PABS closed loop (needs Rust integration, out of scope for synthetic ticks)
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- ADR-108: Kyber substitution (quantum-resistant)
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- Loop retrospective / 00-summary.md (still ~2.5h until cron stop)
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~2.5h to cron stop. **27 ticks landed.** R6 family + R3 arc both substantively complete.
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