# WIA-SOC-012 Telecommunications Infrastructure Standard
## Phase 3: Protocol Specification

> **Version**: 1.0.0  
> **Status**: Stable  
> **Last Updated**: 2025

---

## 1. Overview

Phase 3 defines communication protocols for inter-node coordination, network orchestration, and real-time data exchange in telecommunications infrastructure. This specification ensures efficient, secure, and scalable communication between infrastructure elements.

### 1.1 Design Principles

- **Efficiency**: Minimal overhead, optimized for high-frequency communication
- **Reliability**: Guaranteed delivery for critical messages
- **Scalability**: Support for millions of infrastructure nodes
- **Security**: End-to-end encryption, mutual authentication
- **Real-time**: Sub-second latency for time-sensitive operations

---

## 2. Protocol Stack

### 2.1 Transport Layer

#### WebSocket Protocol (WSS)
Primary protocol for real-time bidirectional communication:

\`\`\`
wss://protocol.wiastandards.com/v1/infrastructure
\`\`\`

**Features:**
- Full-duplex communication
- Low latency (< 10ms typical)
- Automatic reconnection
- Heartbeat mechanism (30-second interval)

**Connection Handshake:**
\`\`\`javascript
const ws = new WebSocket('wss://protocol.wiastandards.com/v1/infrastructure');

ws.onopen = () => {
  ws.send(JSON.stringify({
    type: 'AUTH',
    token: 'api_key_here',
    node_id: '550e8400-e29b-41d4-a716-446655440000'
  }));
};
\`\`\`

#### MQTT Protocol
Alternative protocol for IoT and constrained devices:

\`\`\`
mqtts://mqtt.wiastandards.com:8883
\`\`\`

**Topics:**
- `infra/{node_id}/telemetry` - Telemetry data publishing
- `infra/{node_id}/commands` - Command reception
- `infra/{node_id}/status` - Status updates
- `infra/broadcast/alerts` - System-wide alerts

---

## 3. Message Format

### 3.1 Base Message Structure

\`\`\`json
{
  "message_id": "uuid",
  "timestamp": "2025-01-15T14:30:00.123Z",
  "version": "1.0.0",
  "type": "TELEMETRY | COMMAND | STATUS | ALERT | ACK",
  "source_node": "uuid",
  "target_node": "uuid | broadcast",
  "priority": "low | normal | high | critical",
  "payload": {}
}
\`\`\`

### 3.2 Message Types

#### TELEMETRY Message
Real-time performance and status data:

\`\`\`json
{
  "type": "TELEMETRY",
  "source_node": "550e8400-e29b-41d4-a716-446655440000",
  "payload": {
    "metrics": {
      "throughput_mbps": 2500,
      "latency_ms": 10,
      "active_users": 1250,
      "cpu_percent": 45,
      "memory_percent": 62
    },
    "timestamp": "2025-01-15T14:30:00Z"
  }
}
\`\`\`

#### COMMAND Message
Control and configuration commands:

\`\`\`json
{
  "type": "COMMAND",
  "target_node": "550e8400-e29b-41d4-a716-446655440000",
  "priority": "high",
  "payload": {
    "command": "UPDATE_CONFIG",
    "parameters": {
      "sector_azimuth": 45,
      "power_dbm": 20,
      "electrical_tilt": -3
    }
  }
}
\`\`\`

#### STATUS Message
Node operational status:

\`\`\`json
{
  "type": "STATUS",
  "source_node": "550e8400-e29b-41d4-a716-446655440000",
  "payload": {
    "status": "operational | maintenance | offline | error",
    "health_score": 95,
    "last_maintenance": "2024-12-01T10:00:00Z",
    "next_maintenance": "2025-03-01T10:00:00Z"
  }
}
\`\`\`

#### ALERT Message
Critical events and alarms:

\`\`\`json
{
  "type": "ALERT",
  "priority": "critical",
  "source_node": "550e8400-e29b-41d4-a716-446655440000",
  "payload": {
    "alert_type": "POWER_FAILURE | CONNECTIVITY_LOSS | THERMAL_ALERT | SECURITY_BREACH",
    "severity": "warning | error | critical",
    "description": "Battery backup activated - grid power lost",
    "recommended_action": "Dispatch maintenance crew immediately"
  }
}
\`\`\`

#### ACK Message
Acknowledgment of received messages:

\`\`\`json
{
  "type": "ACK",
  "payload": {
    "ack_message_id": "original-message-uuid",
    "status": "received | processed | failed",
    "error": "optional error message"
  }
}
\`\`\`

---

## 4. Network Orchestration Protocol

### 4.1 Self-Organizing Network (SON)

#### Automatic Neighbor Relation (ANR)
\`\`\`json
{
  "type": "SON_ANR",
  "source_node": "node-a",
  "payload": {
    "operation": "add | remove | update",
    "neighbor": {
      "node_id": "node-b",
      "pci": 125,
      "rsrp_dbm": -75,
      "rsrq_db": -10
    }
  }
}
\`\`\`

#### Load Balancing
\`\`\`json
{
  "type": "SON_LOAD_BALANCE",
  "source_node": "overloaded-node",
  "payload": {
    "current_load_percent": 95,
    "offload_target": "neighbor-node",
    "offload_users": 200
  }
}
\`\`\`

#### Mobility Optimization
\`\`\`json
{
  "type": "SON_MOBILITY",
  "payload": {
    "handover_parameters": {
      "hysteresis_db": 3,
      "time_to_trigger_ms": 160,
      "a3_offset_db": 2
    }
  }
}
\`\`\`

### 4.2 Centralized SON (C-SON)

#### Optimization Request
\`\`\`json
{
  "type": "CSON_OPTIMIZE",
  "target_node": "group:region-a",
  "payload": {
    "optimization_type": "coverage | capacity | interference | energy",
    "constraints": {
      "min_coverage_percent": 95,
      "max_power_increase_db": 3
    }
  }
}
\`\`\`

---

## 5. Network Slicing Protocol

### 5.1 Slice Creation
\`\`\`json
{
  "type": "SLICE_CREATE",
  "payload": {
    "slice_id": "slice-uuid",
    "slice_type": "eMBB | URLLC | mMTC",
    "sla": {
      "bandwidth_gbps": 10,
      "latency_ms": 1,
      "reliability_percent": 99.999
    },
    "duration": "permanent | temporary",
    "resources": {
      "cpu_percent": 20,
      "memory_gb": 32,
      "spectrum_mhz": 100
    }
  }
}
\`\`\`

### 5.2 Slice Modification
\`\`\`json
{
  "type": "SLICE_MODIFY",
  "payload": {
    "slice_id": "slice-uuid",
    "changes": {
      "bandwidth_gbps": 15,
      "add_nodes": ["node-c", "node-d"],
      "remove_nodes": ["node-x"]
    }
  }
}
\`\`\`

---

## 6. Edge Computing Protocol

### 6.1 Workload Placement
\`\`\`json
{
  "type": "EDGE_WORKLOAD",
  "payload": {
    "workload_id": "uuid",
    "application": "video_transcoding | ar_processing | ai_inference",
    "requirements": {
      "cpu_cores": 4,
      "memory_gb": 16,
      "gpu": true,
      "max_latency_ms": 5
    },
    "target_edge_nodes": ["edge-1", "edge-2"]
  }
}
\`\`\`

### 6.2 Service Migration
\`\`\`json
{
  "type": "EDGE_MIGRATE",
  "payload": {
    "service_id": "uuid",
    "source_node": "edge-1",
    "target_node": "edge-2",
    "migration_type": "live | cold",
    "reason": "load_balance | maintenance | failure"
  }
}
\`\`\`

---

## 7. Security Protocol

### 7.1 Mutual TLS (mTLS)
All node-to-node communication must use mTLS:

**Certificate Requirements:**
- RSA 4096 or ECDSA P-384
- Validity: Max 1 year
- Subject CN: Node UUID
- SAN: Node IP addresses

**TLS Version:** TLS 1.3 minimum

**Cipher Suites:**
- TLS_AES_256_GCM_SHA384
- TLS_CHACHA20_POLY1305_SHA256

### 7.2 Message Signing
Critical messages must be digitally signed:

\`\`\`json
{
  "message": {...},
  "signature": {
    "algorithm": "RS256 | ES384",
    "value": "base64-encoded-signature",
    "timestamp": "2025-01-15T14:30:00Z"
  }
}
\`\`\`

### 7.3 Encryption
End-to-end encryption for sensitive data:

\`\`\`json
{
  "encrypted_payload": "base64-encoded-encrypted-data",
  "encryption": {
    "algorithm": "AES-256-GCM",
    "key_id": "key-uuid",
    "iv": "base64-encoded-iv"
  }
}
\`\`\`

---

## 8. Quality of Service (QoS)

### 8.1 Message Priority
- **Critical (0)**: Emergency alerts, system failures (< 10ms delivery)
- **High (1)**: Control commands, configuration changes (< 100ms)
- **Normal (2)**: Regular telemetry, status updates (< 1s)
- **Low (3)**: Logs, historical data (best effort)

### 8.2 Delivery Guarantees
- **At-most-once**: Fire-and-forget (low priority)
- **At-least-once**: Retry until ACK (normal priority)
- **Exactly-once**: Deduplication + retry (critical priority)

---

## 9. Protocol State Machine

### 9.1 Node States
\`\`\`
DISCONNECTED → CONNECTING → AUTHENTICATING → CONNECTED → OPERATIONAL
                    ↓            ↓              ↓             ↓
                  ERROR ← ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┘
\`\`\`

### 9.2 Connection Lifecycle
1. **Connect**: Establish WebSocket/MQTT connection
2. **Authenticate**: Exchange credentials
3. **Register**: Send node capabilities and status
4. **Heartbeat**: Periodic ping (every 30s)
5. **Operational**: Normal message exchange
6. **Graceful Shutdown**: Clean disconnection

---

## 10. Performance Requirements

### 10.1 Latency Targets
- Telemetry delivery: < 100ms (95th percentile)
- Command delivery: < 50ms (99th percentile)
- Alert delivery: < 10ms (100th percentile)

### 10.2 Throughput
- Per node: 1000 messages/second sustained
- System-wide: 10M messages/second

### 10.3 Reliability
- Message delivery success rate: > 99.99%
- Connection uptime: > 99.95%

---

## 11. Error Handling

### 11.1 Error Codes
- `1000`: Normal closure
- `1001`: Going away (shutdown)
- `1002`: Protocol error
- `1003`: Unsupported data
- `4000`: Authentication failed
- `4001`: Authorization denied
- `4002`: Invalid message format
- `4003`: Rate limit exceeded

### 11.2 Retry Strategy
\`\`\`javascript
const retryConfig = {
  maxAttempts: 5,
  initialDelay: 1000,
  maxDelay: 30000,
  backoffMultiplier: 2
};
\`\`\`

---

## 12. Monitoring and Observability

### 12.1 Protocol Metrics
- Message rate (messages/second)
- Average latency (milliseconds)
- Error rate (errors/total messages)
- Connection count (active connections)
- Bandwidth usage (bytes/second)

### 12.2 Distributed Tracing
Include trace context in messages:

\`\`\`json
{
  "trace": {
    "trace_id": "uuid",
    "span_id": "uuid",
    "parent_span_id": "uuid"
  }
}
\`\`\`

---

**WIA-SOC-012 Phase 3 v1.0**  
© 2025 SmileStory Inc. / WIA