adr-113: multistatic placement strategy — consolidates 9-tick R6 family into decision matrix (#734)
Amends ADR-029 (RuvSense multistatic). Consolidates the SOTA research
loop's 9-tick R6 family into a single 4-axis decision matrix
(dimension x zone-mode x occupants x cog).
Decision matrix highlights:
- 2D vital-signs cogs: chest-centric, N=5, walls 0.8/1.5 m -> 100%
- 3D vital-signs cogs: chest-centric, N=6, NO ceiling -> 82%
- 2D pose cogs: body, N=5, walls mixed -> 97%
- 3D pose cogs: body, N=7-8, mixed L/M/H -> 65%+
- Person count: body, N=4, walls mixed -> 86%
- Presence only: body, N=3, walls low -> 63%
- Maritime cabin: chest, N=4, low -> 80%+
- Wildlife corridor: linear, N=4, tree-mount -> 70%+
Seven binding rules extracted from R6 family:
1. Ceiling-only mounting fails (R6.2.1)
2. Vertical link diversity wins in 3D (R6.2.1)
3. Anchor heights match target zone heights (R6.2.4)
4. Chest-centric beats body for vital signs (R6.2.3)
5. Multi-subject union is the right target (R6.2.5)
6. N=5 is the consumer recommendation (R6.2.2 + R6.2.5)
7. Avoid placing target zones on LOS line (R6.1)
CLI productisation:
wifi-densepose plan-antennas
--room W H [Z] --target ... --target-mode {body,chest}
--freq-ghz F --n-anchors N --cog NAME
MCP tool:
ruview_placement_recommend(room, targets, cog)
-> {anchors, coverage, rationale}
~360 LOC total for placement-strategy productisation.
Per-cog auto-config (the --cog flag looks up):
- cog-presence: body, 3
- cog-person-count: body, 4
- cog-pose-estimation: body, 5 (2D) / 7 (3D)
- cog-vital-signs / breathing / heart-rate: CHEST, 5/6
- cog-intruder: body, 5
- cog-maritime-watch: chest, 4
- cog-wildlife: linear, 4
The R6 family produced 9 ticks of physics + simulation, each adding
1-2 axes to the placement question. ADR-113 collapses all 9 into a
single decision matrix that a non-physicist installer can use.
Composes:
- R6.2 family (9 ticks) all feed this ADR
- R7 mincut: N >= 4 satisfied for all multi-feature cogs
- R10/R11 wildlife/maritime entries in matrix
- R12 PABS/R12.1: placement coverage = intrusion-detection sensitivity
- R14 V1/V2/V3 all covered
- ADR-029 directly amended
Honest scope:
- Synthetic physics; bench validation pending
- Single room geometry baseline (5x5 + 4x6 m)
- 5 cm pose-tracker noise assumed
- Free-space, no multipath/furniture occlusion
- Greedy + 4-restart search
ADR chain after this tick (loop's 6 new ADRs + 3 existing):
105/106/107/108/109/113 + 100/103/104 = 9 ADRs in the full chain
(privacy + federation + provenance + placement).
Coordination: ticks/tick-31.md, no PROGRESS.md edit.
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# ADR-113: Multistatic anchor placement strategy
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**Status:** Proposed · **Date:** 2026-05-22 · **Author:** SOTA research loop tick-31 · **Amends:** ADR-029 (RuvSense multistatic sensing mode)
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## Context
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ADR-029 (RuvSense multistatic) introduced multi-anchor CSI sensing but did not specify **how many anchors, where to place them, or how zones depend on the target cog**. The SOTA research loop (2026-05-22) produced 9 ticks in the R6 family that quantitatively answer these questions:
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- **R6 / R6.1**: Fresnel forward model (single + multi-scatterer)
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- **R6.2**: 2D placement search
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- **R6.2.1**: 3D placement (ceiling-only fails)
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- **R6.2.2**: 2D N-anchor saturation (knee at N=5)
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- **R6.2.2.1**: 3D N-anchor (2D knee doesn't hold)
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- **R6.2.3**: chest-centric zones (+27 pp gain for vital signs)
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- **R6.2.4**: 3D + chest composition (knee at N=6, no ceiling)
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- **R6.2.5**: multi-subject union (N=5 hits 100% for 1-4 occupants)
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This ADR consolidates the findings into a single placement specification, parameterised by **dimension × zone-mode × occupant-count × cog**.
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## Decision
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Adopt the **4-axis placement decision matrix** below as the binding RuView installation specification.
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### Decision matrix
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| Cog category | Dimension | Zone mode | Occupants | Recommended N | Anchor heights | Expected coverage |
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|---|---|---|---:|---:|---|---:|
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| Presence / occupancy | 2D | body | 1 | 3 | walls @ 0.8 m | 63% |
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| Person count | 2D | body | 1-4 | 4 | walls @ 0.8-1.5 m mixed | 86% |
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| Pose estimation | 2D | body | 1-2 | **5** | walls @ 0.8/1.5 m mixed | 97% |
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| **Vital signs** | 2D | **chest** | 1-4 | **5** | walls @ 0.8/1.5 m | **100%** |
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| Pose estimation (3D) | 3D | body | 1-2 | 7-8 | mixed: 0.8/1.5/2.4 m | 65%+ |
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| **Vital signs (3D)** | 3D | **chest** | 1-4 | **6** | walls @ 0.8/1.5 m, NO ceiling | **82%** |
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| Maritime cabin | 2D | chest | 1-3 | 4 | low (0.5-0.8 m) | 80%+ |
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| Wildlife sensing | 1D linear | full-corridor | 1-5 species | 4 (along corridor) | tree-mount mixed | 70%+ |
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### Key rules (extracted from R6 family)
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1. **Ceiling-only mounting always fails** (R6.2.1): both antennas at ceiling height produce a Fresnel envelope sitting AT ceiling, never reaching floor-level targets. Always include at least one low-anchor.
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2. **Vertical link diversity wins in 3D** (R6.2.1): diagonal-in-z links (e.g. 0.8 m → 1.5 m) tilt the ellipsoid through multiple elevations.
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3. **Anchor heights should match target zone heights** (R6.2.4): chest-centric zones at z=0.3-1.5 don't benefit from ceiling (z=2.4) anchors. Full-body coverage does.
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4. **Chest-centric beats body-centric for vital signs** (R6.2.3): +27 pp coverage gain at N=5 from smaller, occupant-specific zones.
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5. **Multi-subject union is the right target for households** (R6.2.5): single-subject placement loses 29 pp when extended to 4 occupants; multi-subject-optimised placement keeps 100%.
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6. **N=5 is the consumer recommendation** (R6.2.2 + R6.2.5): the 2D chest-centric multi-subject knee. Beyond N=5, marginal gains are <1 pp.
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7. **Avoid placing target zones on the LOS line** (R6.1): path-delta is 2nd-order in offset for on-LOS scatterers; breathing motion barely changes path length. Real installations need subjects OFF the LOS.
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### CLI specification (productisation)
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The R6.2 CLI tool surfaced through the family ticks:
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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-saturate if omitted
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--restarts K # 4 default
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--cog COG_NAME # auto-select target-mode + N
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```
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Total LOC for productisation: ~100 LOC on top of the R6.2.5 reference implementation.
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### MCP surface (per ADR-104)
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```
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ruview_placement_recommend(
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room: {width, depth, ceiling?},
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targets: [{name, position, size}],
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cog: str // auto-configures target-mode + N
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) -> {
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anchors: [{x, y, z, height_category}],
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expected_coverage: float,
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placement_rationale: str
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}
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```
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## Alternatives considered
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### A. Keep ADR-029 silent on placement
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Status: **rejected**. Without explicit guidance, installations choose placement arbitrarily; R6.2 measured **93× spread** between optimal and median placement. Silence is a 93× implicit loss.
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### B. Always recommend N=5 + body-centric
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Status: **rejected**. The 2D body-centric N=5 recommendation under-promises for vital-signs (chest-centric is better) and over-promises for 3D body-centric (97% → 49% in honest 3D, per R6.2.2.1).
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### C. Always recommend N=8
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Status: **rejected**. R6.2.2.1 showed the 3D saturation curve never has a clean knee; bumping to N=8 gets 65% coverage at body-centric, but the chest-centric N=6 alternative hits 82% with fewer hardware units. Per-cog decision is the right granularity.
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### D. Recommend per-cog without dimension awareness
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Status: **rejected**. R6.2.1 + R6.2.2.1 surface that the 2D recommendation systematically under-promises 3D realities. The dimension axis must be explicit.
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## Threat model
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Placement strategy is not a security-critical decision in itself; coverage gaps create **functional risk**, not adversarial risk. The 4-axis matrix ensures:
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| Risk | Mitigation |
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|---|---|
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| Vital-signs coverage gap | chest-centric + N=5 (or N=6 in 3D) at recommended heights |
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| Sleep-monitoring miss | both anchors low (0.5-0.8 m), opposite sides of bed |
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| Multi-subject failure | use multi-subject-aware placement (`--target` repeated) |
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| Adversarial single-link spoofing | R7 mincut needs N ≥ 4 — placement matrix ensures this for all multi-feature cogs |
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| Per-installation variance from documented baseline | CLI tool gives reproducible deterministic placement |
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## Consequences
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### Positive
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1. **Single canonical placement spec** for installers, replacing tribal knowledge with a numbers-backed decision matrix.
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2. **Per-cog optimization** without overlapping with within-cog tuning (target zones, sensitivity thresholds).
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3. **CLI tool unblocks self-service installation** — customers can run `wifi-densepose plan-antennas` in 2 minutes and get a placement diagram.
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4. **MCP tool unblocks AI-agent-driven deployment** — empathic appliance integration partners can call `ruview_placement_recommend` programmatically.
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5. **R7 mincut adversarial defence is automatically satisfied** for all multi-feature cogs (which need N ≥ 4 anyway).
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### Negative
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1. **The matrix is one geometry deep** — 5×5 m bedroom benchmarks. Larger rooms / oddly-shaped rooms need separate benchmarks; the matrix should be extended over time.
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2. **Per-cog matrix entries** require periodic re-validation when cogs change architecture.
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3. **Adds installer-time complexity** — choosing the right matrix row requires knowing the cog's category. The CLI's `--cog` flag absorbs this.
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4. **Multi-cog deployments** need union-of-matrix-rows logic, currently catalogued for future work.
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5. **3D body-centric still under-performs** (65% N=8) — no architectural fix; chest-centric is the workaround for vital-signs, but pose-estimation in 3D may need a different approach.
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### What this ADR DOES NOT cover
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1. **Production validation on real hardware** — all matrix values are synthetic-physics derived. Bench validation on COM5 ESP32-S3 is the next step.
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2. **Time-varying placement** — the matrix assumes fixed anchors; mobile anchors (e.g. on a Roomba) are a different regime.
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3. **Multi-room placement** — within-room only; cross-room sensing needs separate analysis.
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4. **Per-room-shape benchmarking** — only 5×5 m bedroom + 4×6 m living-room-class tested.
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5. **Per-frequency matrix variation** — all rows are 2.4 GHz; 5 GHz and 6 GHz have different envelope widths and may shift the optimum.
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## Bridge to existing ADRs
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- **ADR-029 (RuvSense multistatic)** — **directly amends**: ADR-029's deferred "anchor placement" specification is now this matrix.
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- **ADR-079 / ADR-101 (pose tracker)**: depends on accurate pose extraction; ADR-113's anchor count guarantees N ≥ 5 for pose cogs, which gives the pose tracker enough multistatic coverage.
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- **ADR-100 (cog packaging)**: cogs are signed with ADR-100; placement decisions are independent.
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- **ADR-103 (cog-person-count)**: 2D body-centric N=4 entry maps to this cog.
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- **ADR-104 (ruview-mcp + ruview-cli)**: `ruview_placement_recommend` becomes a new MCP tool.
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- **ADR-105 / ADR-106 / ADR-107**: federation operates on signed cog outputs; placement quality affects federation gradient quality (better placement → faster ε convergence).
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- **ADR-108 / ADR-109**: PQC chain protects placement-recommendation outputs in transit.
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## Per-cog target-mode auto-selection
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The `--cog` flag in the CLI looks up the cog category and maps to matrix row:
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| Cog | Category | Target mode | Heights | N |
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|---|---|---|---|---:|
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| `cog-presence` | presence | body | low | 3 |
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| `cog-person-count` | count | body | mixed low | 4 |
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| `cog-pose-estimation` | pose | body | mixed | 5 (2D) / 7 (3D) |
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| `cog-vital-signs` | vital signs | **chest** | low+mid | **5 (2D) / 6 (3D)** |
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| `cog-breathing` | vital signs | chest | low+mid | 5 (2D) / 6 (3D) |
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| `cog-heart-rate` | vital signs | chest | low+mid | 5 (2D) / 6 (3D) |
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| `cog-intruder` | structure detection | body | mixed | 5 |
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| `cog-maritime-watch` | maritime | chest | low | 4 |
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| `cog-wildlife` | wildlife | linear | tree-mount | 4 |
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## Connection to research-loop threads
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- **R5 (saliency)** — explains why placement maximising Fresnel coverage gives band-spread saliency.
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- **R6 / R6.1 (forward model)** — physical foundation.
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- **R6.2 family (9 ticks)** — the entire R6.2 family feeds this ADR.
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- **R7 (mincut)** — N ≥ 4 satisfied for all multi-feature cogs.
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- **R10 (foliage)** — wildlife corridor placement is a 1D linear variant; future R6.2.6 could specialise.
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- **R11 (maritime)** — cabin placement is in the matrix.
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- **R12 PABS / R12.1** — placement coverage = intrusion-detection sensitivity.
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- **R14 (empathic appliances)** — V1 lighting (chest-mode N=5) + V2 HVAC (mixed) + V3 attention (chest-mode) covered.
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- **R15 (RF biometric)** — per-primitive saliency may need a future placement axis.
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## Honest scope
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- **Synthetic physics derivation** — all matrix values come from numpy simulations, not bench measurements. Real-world deployment may shift values by ±5-15%.
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- **Single room-geometry baseline** — 5×5 m + 4×6 m. The matrix should grow over time to cover hallways, large living rooms, factory floors.
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- **5 cm pose-tracker noise** — assumed in R12.1; degraded pose tracking may invalidate some recommendations.
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- **Free-space propagation** — no multipath modelling; real rooms add 5-15% coverage.
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- **No furniture occlusion** — sofas, walls, wardrobes ignored.
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- **Greedy + 4-restart search** — global optimum may be 1-2 pp higher.
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## Implementation plan
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| Step | LOC | Owner |
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|---|---:|---|
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| 1. CLI `--cog` flag with category lookup | 60 | TBD |
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| 2. MCP tool `ruview_placement_recommend` | 80 | TBD |
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| 3. Per-cog category metadata in cog manifests | 30 | per-cog |
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| 4. 3D ellipsoid extension to CLI tool | 50 | TBD |
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| 5. Multi-target union to CLI tool | 40 | TBD |
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| 6. Integration tests against the R6 family numpy reference | — | TBD |
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Total ~260 LOC. Combined with R6.2 productisation (~100 LOC), placement-strategy budget is ~360 LOC.
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## Decision-making record
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- 2026-05-22 10:06 UTC — drafted by SOTA research loop tick-31 consolidating 9 R6-family ticks. Status: Proposed.
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- Pending: ADR-029 author (this is an amendment), production-validator (matrix needs bench validation), MCP/CLI maintainer (CLI surface extension).
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## What this ADR closes
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The **multistatic placement question** that ADR-029 left open. After this ADR, ADR-029 + ADR-113 + the R6.2 CLI form a coherent multistatic sensing specification with quantified expected coverage per cog and dimension.
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This is the **9th ADR** the SOTA loop has produced (counting ADR-105 → ADR-109 + ADR-113), and the last one focused on a research-loop output. Future ADRs (ADR-110/111/112) are operational, not research-driven.
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## Closing observation
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The R6 family produced 9 ticks of physics + simulation, each adding 1-2 axes to the placement question. ADR-113 collapses all 9 into a single decision matrix that a non-physicist installer can use. **The loop's most ship-relevant integrative output.**
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# Tick 31 — 2026-05-22 10:10 UTC
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**Thread:** ADR-113 (multistatic placement strategy)
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**Verdict:** Consolidates the 9-tick R6 family into a single architectural specification with a 4-axis decision matrix (dimension × zone-mode × occupants × cog). Amends ADR-029. Most ship-relevant integrative output of the loop.
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## What shipped
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- `docs/adr/ADR-113-multistatic-placement-strategy.md` — full ADR draft.
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## The 4-axis decision matrix
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| Cog | Dim | Mode | Occ | N | Heights | Coverage |
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|---|---|---|---:|---:|---|---:|
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| Presence | 2D | body | 1 | 3 | walls 0.8 m | 63% |
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| Person count | 2D | body | 1-4 | 4 | walls mixed | 86% |
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| Pose | 2D | body | 1-2 | 5 | walls mixed | 97% |
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| **Vital signs** | 2D | **chest** | 1-4 | **5** | walls 0.8/1.5 | **100%** |
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| Pose | 3D | body | 1-2 | 7-8 | mixed 0.8/1.5/2.4 | 65%+ |
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| **Vital signs** | 3D | **chest** | 1-4 | **6** | walls 0.8/1.5 NO ceiling | **82%** |
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| Maritime cabin | 2D | chest | 1-3 | 4 | low | 80%+ |
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| Wildlife | 1D | linear | 1-5 | 4 | tree mixed | 70%+ |
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## Seven binding rules
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1. Ceiling-only mounting fails (R6.2.1)
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2. Vertical link diversity wins in 3D (R6.2.1)
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3. Anchor heights match target zone heights (R6.2.4)
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4. Chest-centric beats body for vital signs (R6.2.3)
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5. Multi-subject union is the right target (R6.2.5)
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6. N=5 is the consumer recommendation (R6.2.2 + R6.2.5)
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7. Avoid placing target zones on LOS line (R6.1)
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## CLI + MCP productisation surface
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```
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wifi-densepose plan-antennas
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--room W H [Z] --target ... --target-mode {body,chest}
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--freq-ghz F --n-anchors N --cog NAME
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```
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```
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ruview_placement_recommend(room, targets, cog) -> {anchors, coverage, rationale}
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```
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~360 LOC total for placement-strategy productisation.
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## Per-cog auto-config
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| Cog | Mode | N |
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|---|---|---:|
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| cog-presence | body | 3 |
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| cog-person-count | body | 4 |
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| cog-pose-estimation | body | 5/7 (2D/3D) |
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| **cog-vital-signs** | **chest** | **5/6** |
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| cog-breathing | chest | 5/6 |
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| cog-heart-rate | chest | 5/6 |
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| cog-intruder | body | 5 |
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| cog-maritime-watch | chest | 4 |
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| cog-wildlife | linear | 4 |
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## Why ADR-113 is the loop's most integrative output
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The R6 family produced 9 ticks of physics + simulation, each adding 1-2 axes to the placement question. ADR-113 collapses all 9 into a single decision matrix that a non-physicist installer can use.
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## Composes with prior threads
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- R6.2 family (9 ticks) all feed this ADR
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- R7 mincut: N ≥ 4 satisfied for all multi-feature cogs
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- R10 / R11: wildlife / maritime entries in the matrix
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- R12 PABS / R12.1: placement coverage = intrusion-detection sensitivity
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- R14 V1/V2/V3: all matrix rows covered
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- ADR-029: directly amended
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## Honest scope
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- Synthetic physics derivation; bench validation pending
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- Single room-geometry baseline (5×5 m bedroom + 4×6 m living-room class)
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- 5 cm pose-tracker noise assumed (R12.1)
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- Free-space, no multipath, no furniture occlusion
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- Greedy + 4-restart search
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## ADR chain after this tick (9 loop ADRs)
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| # | ADR | Status |
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|---|---|---|
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| 1 | ADR-105 | within-install fed |
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| 2 | ADR-106 | DP + isolation |
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| 3 | ADR-107 | cross-install + SA |
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| 4 | ADR-108 | PQC key exchange |
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| 5 | ADR-109 | PQC signatures |
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| 6 | **ADR-113** | **multistatic placement** |
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Plus 3 already shipped before the loop (100, 103, 104). 9 ADRs total in the privacy + federation + provenance + placement chain.
|
||||
|
||||
## Coordination
|
||||
|
||||
`ticks/tick-31.md`. No PROGRESS.md edit. Branch `research/sota-adr113-multistatic-placement`.
|
||||
|
||||
## Loop's research + architecture output substantively complete
|
||||
|
||||
After 31 ticks, the loop has produced everything addressable in the cron-driven 8-min unit:
|
||||
- 13 research threads (R1, R3, R5-R15)
|
||||
- 6 ADRs (105-109, 113) closing privacy + federation + provenance + placement
|
||||
- 3 negative-result categories (physics-floor, architecture-error, missing-tool-revisited)
|
||||
- 2 explicit self-corrections
|
||||
- 3 honest-scope findings
|
||||
- 9-tick R6 placement family
|
||||
- 3-tick R3 cross-room re-ID arc
|
||||
- 3-tick R12 structure detection arc (NEGATIVE → POSITIVE → CLOSED LOOP)
|
||||
|
||||
~1.8h to cron stop. Remaining time can be used for:
|
||||
1. Continue with new ADRs (ADR-110/111/112 catalogued but operational, not research-driven)
|
||||
2. Cross-thread integration experiments
|
||||
3. Eventually write the 00-summary.md after 12:00 UTC stop
|
||||
Loading…
Reference in New Issue