Wi-SUN FAN (Field Area Network) provides self-forming, self-healing IPv6 wireless mesh communication for millions of smart meters in dense urban and rural environments.

Protocol Stack

• Application: DLMS/COSEM (IEC 62056-53/62)
• Transport: UDP Wrapper (IEC 62056-47) on port 4059
• Network: IPv6 / RPL (Routing Protocol for Low-Power and Lossy Networks)
• Adaptation: 6LoWPAN (RFC 6282 Header Compression)
• MAC / PHY: IEEE 802.15.4g/e (FSK / OFDM modulation at 868 MHz / 915 MHz)

Key Network Tuning Parameters

1. UDP Checksum Validation: Enable mandatory UDP checksums to filter out packet corruption before invoking DLMS deciphering.
2. Path MTU Discovery: Configure 6LoWPAN maximum uncompressed MTU to 1280 bytes to avoid ICMPv6 Packet Too Big errors.
3. Trickle Timer Tuning: Tune RPL DIO trickle timers ($I_{\min} = 12$, $I_{\max} = 20$) to balance routing convergence speed with RF spectrum congestion.