Part 13 — Battery-Aware Scheduling Architecture

Reusable P2P Communication Platform

Status: Architecture specification
Part: 13 of 24
Primary language: Rust
Primary goals: energy-efficient communication, battery-aware task scheduling, thermal protection, radio-use minimization, mobile background adaptation, graceful degradation, emergency overrides, durable work preservation, reusable across messaging/files/DTN/calls/multipath/headless deployments

1. Purpose

A communication platform can be technically correct and still be unusable if it drains the battery, overheats the device, or repeatedly wakes radios and background services.

This is especially important because the platform may perform:

• P2P discovery
• Iroh connectivity
• Bluetooth scanning
• Wi-Fi Direct/Aware setup
• DTN store-carry-forward
• large file transfers
• multipath networking
• AV1 software encoding
• indexing
• hashing
• encryption
• background synchronization
• emergency relay work

The scheduling architecture must therefore understand energy as a first-class constraint.

The core rule is:

Durable work should survive low-power conditions, but execution intensity should adapt to battery, charging, thermal, foreground/background, and user policy.

The platform should slow down, defer, batch, or downgrade before it becomes a battery or thermal problem.

2. Architectural Position

Platform Signals
├── Battery
├── Charging
├── Thermal
├── Foreground/Background
├── Network Metering
└── OS Restrictions
        ↓
Battery Policy Engine
        ↓
Effective Runtime Policy
        ↓
Schedulers
├── Routing
├── Multipath
├── Files
├── DTN
├── Discovery
├── Media
├── Sync
└── Background Workers

The battery layer does not own feature semantics.

It tells each subsystem:

how aggressively it may execute

3. Battery-Aware Scheduling Is Not a Separate App Mode

Do not scatter logic like:

if battery < 20% { ... }

through every crate.

Correct:

Battery/Power State
       ↓
Power Policy
       ↓
Effective Limits
       ↓
Feature Schedulers

This ensures consistent behavior.

4. Core Power Inputs

Recommended signals:

battery level class
charging state
power saver
thermal state
foreground/background
screen state if useful
network metering
roaming
external power availability
device resource profile

Do not require exact battery percentage everywhere.

5. Battery Level Class

Prefer coarse classes:

#![allow(unused)]
fn main() {
pub enum BatteryLevelClass {
    Critical,
    Low,
    Medium,
    High,
    Full,
    Unknown,
}
}

This reduces overfitting and privacy leakage.

6. Charging State

#![allow(unused)]
fn main() {
pub enum ChargingState {
    NotCharging,
    ChargingSlow,
    ChargingFast,
    Full,
    Unknown,
}
}

A charging device can safely execute more background work.

7. Thermal State

#![allow(unused)]
fn main() {
pub enum ThermalState {
    Nominal,
    Elevated,
    Serious,
    Critical,
    Unknown,
}
}

Thermal pressure may be more important than battery percentage for software AV1, hashing, compression, and large transfers.

8. App Activity State

#![allow(unused)]
fn main() {
pub enum AppActivityState {
    ForegroundInteractive,
    ForegroundIdle,
    BackgroundAllowed,
    BackgroundRestricted,
    SuspendedLikely,
}
}

Platform adapters map Android/iOS/desktop behavior into this neutral model.

9. Power Policy Profiles

Recommended:

#![allow(unused)]
fn main() {
pub enum PowerPolicyProfile {
    Performance,
    Balanced,
    Saver,
    Emergency,
    AlwaysOnNode,
}
}

10. Performance Profile

Use when:

charging
desktop
server
user explicitly requests

Characteristics:

higher transfer concurrency
more aggressive discovery
multipath allowed
background hashing/indexing

11. Balanced Profile

Default consumer behavior.

Characteristics:

normal responsiveness
moderate background work
limited discovery duty cycle
multipath only when useful

12. Saver Profile

Characteristics:

single-path preferred
background bulk deferred
reduced scanning
reduced CPU-heavy work
lower AV1 complexity
coalesced sync

13. Emergency Profile

Emergency mode is not simply:

maximum power always

It should prioritize:

reachability
critical relay work
SOS
authority alerts

while suppressing:

noncritical bulk
analytics
thumbnail generation
background indexing

14. Always-On Node Profile

For:

desktop relay
Raspberry Pi
server
vehicle gateway on external power

Characteristics:

continuous discovery
higher relay quota
DTN gateway active
little battery concern

Still enforce thermal/resource safety.

15. Power State Snapshot

#![allow(unused)]
fn main() {
pub struct PowerState {
    pub battery: BatteryLevelClass,
    pub charging: ChargingState,
    pub thermal: ThermalState,
    pub activity: AppActivityState,
    pub saver_enabled: bool,
    pub metered_network: bool,
}
}

16. Effective Power Budget

Convert platform state into execution budget.

#![allow(unused)]
fn main() {
pub struct PowerBudget {
    pub cpu_class: CpuBudgetClass,
    pub radio_class: RadioBudgetClass,
    pub background_class: BackgroundBudgetClass,
    pub max_parallel_bulk: u8,
    pub multipath_allowed: bool,
    pub aggressive_discovery_allowed: bool,
}
}

17. CPU Budget Class

#![allow(unused)]
fn main() {
pub enum CpuBudgetClass {
    Minimal,
    Low,
    Normal,
    High,
}
}

18. Radio Budget Class

#![allow(unused)]
fn main() {
pub enum RadioBudgetClass {
    Minimal,
    Opportunistic,
    Normal,
    Aggressive,
}
}

19. Background Budget Class

#![allow(unused)]
fn main() {
pub enum BackgroundBudgetClass {
    CriticalOnly,
    Deferred,
    Limited,
    Normal,
}
}

20. Hard Safety vs Power Preference

Battery policy may reduce throughput.

It must not violate hard protocol/resource safety.

Example:

low battery

does not mean:

skip encryption verification

Security invariants remain absolute.

21. Durable Work Preservation

If battery becomes low:

message
file
DTN bundle

should not disappear.

State changes:

Active
→ DeferredByPower

and resumes later.

22. Ephemeral Work

Can be dropped:

typing
presence refresh
stale video frames
diagnostic probes

when power budget tight.

23. Scheduler Integration

Every background-capable subsystem should expose:

pause
resume
reduce_concurrency
change_priority

through a common scheduling interface.

24. Power-Aware Work Descriptor

#![allow(unused)]
fn main() {
pub struct PowerAwareWork {
    pub priority: WorkPriority,
    pub energy_class: EnergyClass,
    pub durable: bool,
    pub deadline: Option<Timestamp>,
    pub deferrable: bool,
}
}

25. Energy Class

#![allow(unused)]
fn main() {
pub enum EnergyClass {
    Tiny,
    Low,
    Medium,
    High,
    VeryHigh,
}
}

Examples:

delivery ACK → Tiny
text send → Low
photo upload → Medium
5 GB transfer → High
AV1 software transcode → VeryHigh

26. Scheduling Decision

#![allow(unused)]
fn main() {
pub enum PowerDecision {
    Run,
    RunThrottled,
    Defer,
    Drop,
    Reject,
}
}

Durable normal work usually gets:

Run / RunThrottled / Defer

not Drop.

27. Decision Inputs

priority
deadline
battery
charging
thermal
foreground/background
resource pressure
network cost
user policy

28. Priority Interaction

Critical work can override saver policy.

Example:

SOS

may run even on low battery.

But it should still use efficient transport ordering.

29. Critical Battery Reserve

At critically low battery:

preserve energy for:
SOS
small messages
identity/security
delivery ACK

Pause:

bulk file
relay bulk
background sync
preview generation

30. Radio Wakeup Cost

Radio activation is expensive.

Prefer:

batch multiple operations

into one wake window rather than waking repeatedly.

31. Wake Window

#![allow(unused)]
fn main() {
pub struct WakeWindow {
    pub started_at: Timestamp,
    pub max_duration: Duration,
    pub work_budget: WorkBudget,
}
}

During window:

send pending small messages
sync receipts
refresh capability

32. Batch Small Work

Useful for:

receipts
presence
small sync
delivery ACK

Avoid one radio activation per event.

33. Network Reuse

If radio already active for:

message send

allow queued compatible small work to piggyback.

34. Discovery Cost

Continuous:

BLE scan
Wi-Fi scan
Wi-Fi Direct discovery

can be expensive.

Use duty cycle.

35. Discovery Duty Cycle

Example:

Foreground:
frequent

Background balanced:
periodic

Saver:
rare

Emergency:
frequent but bounded

36. Proximity Integration

Part 14 should expose one neutral discovery scheduler.

Battery policy decides:

scan interval
scan duration
transport escalation

37. BLE First

For nearby discovery:

BLE

is often suitable as low-energy bootstrap.

Then upgrade to:

Wi-Fi Direct/Aware

only when data volume justifies.

38. Avoid Expensive Upgrade for Tiny Payload

For:

1 KB message

do not create a high-energy Wi-Fi Direct session if BLE or existing path suffices.

39. File Scheduling

File transfer power policy:

small file:
run

large file on battery:
limit concurrency

huge file + saver:
defer unless user foreground

charging:
increase parallelism

40. File Hashing

Large local imports may require hashing/encryption.

Run with bounded CPU parallelism.

If background + low battery:

defer preprocessing

unless user explicitly requested immediate send.

41. Chunk Concurrency

Part 05 file transfer effective chunk workers:

negotiated max
∩ resource max
∩ power max

42. Power-Aware Chunk Parallelism

Example:

Charging: 8
High battery: 4
Low battery: 2
Saver: 1
Critical thermal: 1/pause bulk

Values require benchmarking.

43. Storage I/O

Large disk writes also consume power.

Batch metadata writes where safe.

Avoid excessive fsync for ephemeral state.

Preserve durability for accepted durable work.

44. DTN Scheduling

DTN can be power hungry due to scanning/relay.

Power policy controls:

relay acceptance
scan duty cycle
bundle size
Wi-Fi upgrade
forwarding count

45. DTN Criticality

At low battery:

own critical bundles
delivery ACK
SOS

still forwarded.

Drop/defer:

bulk relay files
low-priority third-party relay

46. Charging Relay Preference

Charging devices can advertise coarse:

HighRelayCapacity

and accept more DTN work.

Do not reveal exact battery percentage.

47. Multipath Scheduling

Part 12 multipath uses multiple radios/paths.

Battery policy may force:

Stripe → Single
Redundant → Single
WarmFailover → allowed for active call

48. Multipath Power Rule

Do not use multiple radios merely for small throughput gain.

Require measurable benefit.

49. Call Scheduling

Calls are interactive and often high priority.

Battery policy should adapt:

video resolution
frame rate
codec complexity
background effects

before dropping call.

50. AV1 Software Encoding

Software AV1 may be CPU intensive.

Power policy should expose:

max encoder complexity
max resolution
max fps

or signal media engine to downgrade.

51. Hardware Codec Preference

On Android, if supported and suitable:

hardware codec

should normally be preferred for battery efficiency.

Codec selection still respects negotiated compatibility.

52. Software Codec Fallback

If only software AV1 available:

allow while foreground/charging
reduce quality when battery/thermal constrained

Do not burn battery for unnecessarily high encode settings.

53. Audio Priority

When power/thermal constrained:

keep audio
reduce/disable video

This is a strong graceful-degradation policy.

54. Media Degradation Ladder

Example:

1080p video
 ↓
720p
 ↓
480p
 ↓
lower fps
 ↓
audio only

Actual values negotiated with media subsystem.

55. Thermal-First Media Control

If thermal state becomes Serious/Critical:

reduce software encode immediately

even if battery high.

56. Background Call

OS may allow active call background with special service/audio session.

Platform adapter reports allowed execution.

Rust scheduler retains media policy.

57. Background Sync

Batch:

read receipts
own-device sync
capability refresh

when OS gives background opportunity.

Do not constantly wake app.

58. Android Integration

Kotlin/platform layer reports:

BatteryManager
power saver
thermal status
background restriction
foreground service state
network metered
charging

Rust owns policy.

59. Android Work Scheduling

For deferred noncritical work, platform adapter may use:

WorkManager
JobScheduler-related mechanisms

where appropriate.

Rust stores durable intent and decides eligibility.

Kotlin schedules execution opportunity.

60. Android Foreground Service

Use only when feature truly requires it:

active call
user-visible large transfer
emergency relay mode

Do not keep permanent foreground service merely to bypass OS policy.

61. Android Doze

Doze may delay background network.

Durable outbox/DTN state survives.

On next allowed wake:

resume prioritized work

62. Android App Standby

Same principle:

execution opportunities are external
durable intent is internal

63. iOS Integration

iOS adapter reports:

low power mode
thermal
background task availability
network state

Rust policy remains common.

64. iOS Constraints

Do not assume continuous background Bluetooth/Wi-Fi behavior.

Architecture degrades to:

foreground
system-approved background windows
push-assisted Internet wake

where allowed.

65. Desktop Behavior

Desktop on AC power:

Performance/Balanced

Laptop on battery:

Balanced/Saver

Use OS power source signals where available.

66. Headless Linux

If plugged into mains:

AlwaysOnNode

Still monitor thermal and UPS/battery if available.

67. UPS-Aware Server

Optional:

mains lost
UPS battery

can trigger:

reduce bulk
preserve relay/control

for edge nodes.

68. Power Policy Engine

#![allow(unused)]
fn main() {
pub trait PowerPolicyEngine {
    fn evaluate(
        &self,
        work: &PowerAwareWork,
        state: &PowerState,
        resources: &ResourceSnapshot,
    ) -> PowerDecision;
}
}

Pure/deterministic where possible.

69. Power Policy Configuration

#![allow(unused)]
fn main() {
pub struct PowerPolicyConfig {
    pub profile: PowerPolicyProfile,
    pub allow_background_bulk: bool,
    pub allow_metered_bulk: bool,
    pub multipath_on_battery: bool,
    pub emergency_override: bool,
}
}

70. User Preferences

Examples:

Battery saver
Allow background transfers
Use mobile data for files
Allow emergency relay

These feed policy.

71. Application Preferences

ERP may choose:

document sync deferred on battery

Messenger may choose:

small messages always immediate

72. Platform Hard Restrictions

If OS says:

background network unavailable

policy cannot override.

It must defer.

73. Policy Layering

OS hard restriction
 ↓
system safety
 ↓
user policy
 ↓
application policy
 ↓
battery profile
 ↓
operation priority

74. Emergency Override Boundaries

Emergency override may:

increase discovery
allow DTN
use metered network

only if product/user policy permits.

Do not silently violate explicit privacy or financial constraints unless product has clearly defined emergency consent.

75. Scheduler Queues

Power-aware queues:

Critical
Interactive
Normal
Bulk
Background

Battery policy changes eligibility/quantum, not durable ownership.

76. Work Aging

Deferred normal work should eventually run when:

charging
foreground
better battery

No permanent starvation.

77. Charging Trigger

When charging starts:

resume deferred:
large transfers
blob preprocessing
index rebuild
backup

with resource limits.

78. Wi-Fi Trigger

When unmetered Wi-Fi appears:

resume allowed bulk

if battery policy permits.

79. Foreground Trigger

User opens app:

increase priority for visible transfer

80. Thermal Recovery Trigger

Thermal returns Nominal:

restore CPU/media concurrency gradually

Use hysteresis.

81. Hysteresis

Do not oscillate between profiles due to tiny battery/thermal changes.

Example:

enter Low at <20%
leave Low at >25%

Exact thresholds platform/policy-specific.

82. Thermal Hysteresis

Similarly:

Critical → Serious → Elevated

restore gradually.

83. Power State Epoch

#![allow(unused)]
fn main() {
pub struct PowerStateEpoch(u64);
}

Increment on meaningful policy state changes.

Schedulers ignore stale decisions.

84. Event Coalescing

Battery percentage may update frequently.

Do not broadcast every 1% change if policy class unchanged.

Emit only class/policy changes.

85. Metrics

Track:

work deferred by power
bulk resumed on charge
multipath disabled by saver
DTN scans reduced
media downgraded thermal
battery mode transitions

86. Privacy

Do not export exact:

battery %
charging timestamp
thermal history

to peers/telemetry unless needed.

Use coarse classes.

87. Peer Capability

Peer may advertise:

relay capacity class

but not exact battery.

Example:

LowRelayCapacity
NormalRelayCapacity
HighRelayCapacity

88. Power-Aware Relay Selection

If local device has multiple DTN peers:

prefer charging/high-capacity relay

all else equal.

89. Power-Aware Routing

Part 03 path score can include:

energy cost

Battery policy adjusts weight.

Saver:

high energy penalty

Emergency:

reliability may outweigh energy

90. Power-Aware Multipath

Part 12 benefit threshold increases when battery low.

Meaning:

secondary path must offer bigger benefit

to activate.

91. Power-Aware Discovery Escalation

Normal message:

do not trigger expensive Wi-Fi Direct discovery

Low battery:

use known paths only if possible

SOS:

allow escalation

92. Power-Aware File Prefetch

Do not automatically download:

full-resolution video
large attachments

in background on low battery.

Maybe fetch:

thumbnail
metadata

93. Power-Aware Own-Device Sync

Own-device sync can prioritize:

message metadata
read state

before:

large blobs

94. Power-Aware Search/Indexing

Search indexing is background CPU/storage work.

Pause or reduce when:

Saver
Serious thermal
Critical battery

Resume when charging.

95. Power-Aware Backup

Backup may run when:

charging
unmetered
background allowed

unless user manually requests now.

96. User-Initiated Override

If user taps:

Send now
Download now

interactive priority can override some saver deferrals.

Still respect:

OS hard restrictions
critical thermal safety
hard resource limits

97. Override Scope

Override only the requested operation.

Do not switch whole runtime to Performance.

98. Power Budget Accounting

Do not pretend to know exact joules without hardware telemetry.

Use coarse estimated cost classes.

Measure later on representative devices.

99. Empirical Tuning

Benchmark:

BLE scan duty cycle
Wi-Fi Direct setup
AV1 software encode
hashing
file chunk concurrency

on real devices.

Then tune policy.

100. Device-Specific Quirks

Some Android vendors have aggressive background killing.

Keep device-specific workarounds in platform adapter, not core policy.

101. Vendor Workarounds

Avoid hard-coding undocumented hacks unless necessary.

Prefer supported OS scheduling APIs.

102. Battery Optimization Exemptions

Do not require users to disable OS battery optimization as default architecture.

If a specialized emergency/always-on deployment needs it, document explicitly.

103. Power-Aware Daemon

Desktop daemon can detect laptop battery.

When battery:

pause background relay/bulk

while preserving messages.

104. Multiple Processes

Only central runtime/daemon should make scheduling decisions.

UI should not start separate uncontrolled transfers.

105. FFI Integration

Host app can report:

foreground/background
power saver

through stable API if platform adapter is external.

Rust core decides.

106. Plugin Limits

Third-party plugin cannot bypass power policy.

It receives:

effective execution budget

and bounded queues.

107. Power Policy for Extensions

Extension declares:

energy class
priority
durable/ephemeral

Runtime maps to actual scheduling.

108. Misbehaving Extension

If plugin continuously requests high-energy work:

quota/resource policy throttles

109. Crash Recovery

Power state itself is mostly ephemeral.

On restart:

requery platform

Durable deferred work remains.

110. Deferred Work Persistence

Persist:

operation state
next eligibility hint

where needed.

Do not persist exact memory/runtime scheduler state.

111. Restart on Low Battery

After crash/restart:

do not immediately resume all pending bulk

Evaluate current power policy first.

112. Thundering Herd

Charging event may make thousands of operations eligible.

Use:

priority
batching
resource admission
jitter

113. Recovery Priority

After restart:

identity/security
SOS
messages
DTN critical
active user transfer
bulk
background

114. Battery Policy and Event Log

Part 04 may record meaningful semantic states:

TransferDeferredByPower

if product/UI needs.

Do not journal every battery change.

115. Diagnostics

Advanced:

Power mode: Saver
Battery: Low
Charging: No
Thermal: Elevated
Bulk workers: 1/4
Multipath: disabled
DTN scan: reduced

116. User-Facing Status

Examples:

Large transfer paused to save battery
Will resume while charging
Video quality reduced because device is hot

Keep wording actionable.

117. Notification Policy

Do not spam users for every power deferral.

Notify only when:

user action required
long-running visible transfer paused
critical feature unavailable

118. Low Battery Emergency UX

If critical battery:

Emergency mode is conserving power for messages and SOS.

Optional, only if user has enabled emergency mode.

119. Thermal UX

If call degrades:

Video quality reduced to cool the device.

120. Tests

Unit:

policy decision
hysteresis
priority override

Integration:

file + low battery
call + thermal
DTN + saver

Platform:

Android power saver
background restriction
charging change

121. Property Tests

Invariants:

Critical durable work is never silently dropped due only to power policy
hard OS restriction is never overridden
bulk cannot run in CriticalOnly background mode
charging cannot exceed hard resource limits

122. Scenario Tests

Example:

battery High
start 5 GB file
battery Low
→ reduce concurrency

enable Saver
→ pause background chunking

plug charger
→ resume

123. Multipath Test

Wi-Fi + cellular
battery Low

Expected:

single path

unless emergency/user override.

124. Call Test

AV1 software call
thermal Serious

Expected:

reduce resolution/fps
or audio-only

125. DTN Test

battery Critical

Expected:

critical bundles continue
bulk relay stops

126. Discovery Test

Saver mode:

BLE scan duty cycle reduced
Wi-Fi escalation rare

127. Charging Test

Charging begins:

deferred indexing/backups eligible

but resource limits still enforced.

128. Background Test

App background-restricted.

Expected:

noncritical work deferred

no busy-loop attempts.

129. Process-Kill Test

Kill while transfer deferred by power.

Restart.

Expected:

still deferred/eligible based on new state

130. Android Real-Device Tests

Need representative devices for:

power saver
thermal
foreground service
background restrictions
hardware codec behavior

Emulator alone is insufficient.

131. Battery Benchmarks

Measure:

idle with runtime
BLE discovery
DTN mode
file upload
AV1 software call
multipath

on real hardware.

132. Energy Regression Tests

Exact joule CI is difficult.

Track coarse trends in dedicated hardware lab if project matures.

133. Scheduler Performance

Power policy evaluation should be cheap.

Do not perform expensive calculations on every packet/frame.

Evaluate at:

operation start
state change
periodic coarse interval

134. Media Update Frequency

Media may need more frequent thermal adaptation than files.

Still avoid per-frame policy recomputation.

135. File Update Frequency

Re-evaluate on:

battery class change
charging change
thermal change
foreground/background

136. DTN Update Frequency

Re-evaluate discovery/relay budget on:

power class
emergency mode
charging

137. Suggested Crate Structure

crates/comm-power/
├── src/
│   ├── lib.rs
│   ├── state.rs
│   ├── profile.rs
│   ├── policy.rs
│   ├── budget.rs
│   ├── work.rs
│   ├── scheduler.rs
│   ├── hysteresis.rs
│   ├── platform.rs
│   ├── diagnostics.rs
│   └── error.rs
└── Cargo.toml

Platform adapters:

comm-platform-android
comm-platform-ios
comm-platform-desktop

138. Public API

#![allow(unused)]
fn main() {
let decision = power.evaluate(&work, &power_state, &resources);
}

Most features use domain wrappers:

power.files()
power.dtn()
power.media()

139. Platform Adapter Trait

#![allow(unused)]
fn main() {
pub trait PowerStateProvider {
    fn current_state(&self) -> PowerState;
    fn subscribe(&self) -> PowerStateStream;
}
}

140. Effective Limit API

#![allow(unused)]
fn main() {
let limits = power.effective_limits(WorkDomain::Files);
}

Could return:

parallelism
background allowed
multipath allowed

141. Initial Production Scope

Implement first:

battery level classes
charging state
thermal state
foreground/background state
Balanced/Saver/Emergency profiles
file concurrency throttling
DTN scan throttling
multipath disable/enable
media quality downgrade hooks
Android power state adapter
desktop power adapter
durable deferred work

Defer initially:

fine-grained joule accounting
predictive battery models
vendor-specific ML tuning

142. Implementation Phases

Phase 1 — State Model

BatteryLevelClass
ChargingState
ThermalState
AppActivityState

Phase 2 — Policy Engine

profiles
PowerDecision
hysteresis

Phase 3 — Files/DTN

parallelism
defer/resume
scan duty cycle

Phase 4 — Multipath/Routing

energy penalty
secondary-path suppression

Phase 5 — Media

AV1 software limits
hardware preference
quality ladder

Phase 6 — Platform Adapters

Android
desktop
iOS

Phase 7 — Hardening

real-device tests
battery benchmarks
thermal scenarios
process-kill recovery

143. Definition of Done

Part 13 is complete when:

• power logic is centralized rather than scattered across features
• battery, charging, thermal, and background state feed one shared policy
• durable work is deferred rather than lost
• stale ephemeral work can be dropped
• file concurrency decreases under low-power/thermal pressure
• multipath can collapse to single-path
• DTN scanning/relay intensity adapts
• critical/SOS traffic retains reserved execution capability
• AV1 software encode can be throttled/downgraded
• hardware codecs can be preferred where appropriate
• call media degrades gracefully before failure
• Android/iOS platform restrictions are treated as hard constraints
• charging/foreground transitions can resume deferred work
• hysteresis prevents mode flapping
• exact battery data is not exposed unnecessarily
• process restart reevaluates current power state before resuming work
• property, scenario, real-device, and thermal tests exist

144. Relationship to Earlier Parts

Part 13 builds on:

01 — Protocol Extension System
02 — Multi-Device Identity
03 — Transport & Routing Policy Engine
04 — Offline Event Log
05 — Robust File / Blob Subsystem
06 — DTN / Store-Carry-Forward
07 — Capability Negotiation
08 — Resource Limits & Backpressure
09 — Crash Recovery
10 — Fuzzing & Protocol Test Suite
11 — Relay / Self-Hosted Infrastructure
12 — Multipath Networking

It directly supports:

14 — Proximity Abstraction
15 — QR / NFC Bootstrap Pairing
16 — Daemon & Headless Runtime
17 — Emergency Priority Architecture
18 — Network Diagnostics & Path Visualization
20 — Embedded Linux Node
22 — Third-Party Protocol Extensions
24 — Plugin / Module Ecosystem

145. Final Principle

The battery-aware scheduler should make this behavior normal:

A user starts a 5 GB transfer.

Battery is high:
→ 4 chunk workers
→ Wi-Fi preferred
→ multipath allowed if useful

Battery drops:
→ 2 workers

Battery saver turns on:
→ 1 worker or pause background transfer

Device gets hot:
→ hashing/AV1 work reduced

User starts an urgent call:
→ call gets priority
→ bulk throttles

Phone is plugged in:
→ deferred bulk/indexing resumes

And in emergency mode:

Low battery does not mean "everything stops."

It means:
preserve energy for the work that matters most.

That is the core purpose of Part 13: keep the communication platform responsive and resilient without turning background networking, AV1, DTN, or large transfers into a battery-drain problem.