Core innovation:

New generation header compression for LPWAN

(*) pronounced “chic”


Standard enabler of IPv6 over LPWANs, SCHC also brings CoAP, UDP, and most internet based protocols.


SCHC compresses the volume of data transmitted, resulting in a reduced time-over-air for devices and increased cell capacity.


SCHC makes accessible and highly effective the use of state-of-art Internet security protocols – DTLS.

IPv6 over LPWANs: why this is important

• Seamless interoperability

Rapid development of services, independent of the underlying radio technology.

• Simple, efficient, scalable

Record time integration with the customers’ operation network and application architectures.

• Ubiquitous

SCHC transforms an LPWAN device into a natice IP devicen, easily addressable from business applications.

SCHC demystified

SCHC is a compression and fragmentation framework tailored for LPWAN.

It prevents the synchronization between elements communicating on the network. Synchronization is actually the operation that consumes the most bandwidth. In LPWAN networks, the nature of data flows is highly predictable. So, rather than saturating the bandwidth with this information, we found it smart to store these communication contexts both in the device and in the network management platform.

When the data is still too heavy to be transported under the given network conditions, SCHC incorporates a fragmentation. This splits the messages and manages their transmission in the network.

Compression : 80% of IoT frame structure is identical from a message to another. SCHC removes any redundant data.

Decompression: The frame sent contains the communication context and the key data to reconstruct the original message.

Global IETF Standard

Outcome of the LPWAN Working Group at IETF, SCHC has been published as an RFC in April 2020.

The Internet Engineering Task Force (IETF) is the international body that defines the standards that guarantee the interoperability and evolution of Internet networks since 1986, in particular with the Internet protocol suite (TCP/IP). The IETF is behind the success of the Internet, by building a scalable system capable of connecting billions of devices and remaining operational after 30+ years.


  • RFC 8724: SCHC generic framework
  • RFC 8824: SCHC for CoAP
  • RFC 9011: SCHC over LoRaWAN
  • (soon) SCHC over NB-IoT
  • (soon) SCHC over Sigfox
  • (soon) Data model for SCHC
  • (soon) SCHC over IEEE 802.15.4

SCHC layer specified by Technology Alliances

SCHC is a compression and fragmentation framework tailored for LPWAN.

LoRa alliance logo

SCHC compression and fragmentation is a IETF standard by the LPWAN WG. The solution complies with RFCs 8724 and 9011.

IPv6 over LoRaWAN with SCHC is a prerequisite to DLMS over LoRaWAN as specified in the communication profile for LPWAN (Bluebook 14).

The LoRa Alliance leverages SCHC for IPv6 communication over LoRaWAN as specified in TS010-1.0.0.

Seamless integration:

Protocol Adaptation

Convert wired services or densify a network of devices with LPWAN connectivity and still keep the original legacy applications and communication protocols. Acklio’s solution adapts protocols with minimum engineering effort. Acklio’s SCHC implementation offers a standard adaptation stack for accelerated time-to-market and reduced TCO.

Protocol adaptation for LPWANs

  • IP-based protocols and more

Adapt proprietary or standard communication stacks for LPWAN without redesigning.

  • Record time-to-market

SCHC port communications over LPWAN with no redesigning of the stack. Record time to market and seamless integration.

  • Streamlined IoT toolchain

Built on top of SCHC, your services are ready for all LPWANs, with dynamic optimization. Allow for real multi-connectivity and network convergence.













Limitless integration

Dynamically adapt standard or private application protocols

… to any IoT network!

LoRaWAN logo

“We are pleased to cooperate with Acklio for IPv6 packet transmission based on B-CDMA technology. B-CDMA has been used in the form of a star topology for the MAC layer communication. Innovid has advanced this technology into mesh network technology. Through this collaboration, Innovid expects to expand its services to various IoT and IP based applications in the future.

Sangchoon Lee
Vice President at Innovid


IPv6 over LoRaWAN®

The Internet protocols are now available in a standard implementation, using the SCHC adaptation layer. This provides new use cases, flexibility in development and integration of solutions – while benefiting from the efficiency of LoRaWAN.

Device retrofit to LoRaWAN

Densify or upgrade existing M2M network with LoRaWAN

Unified service interface

Achieve seamless interoperability with IP, and easy integration to Cloud infrastructure.

Adaptation of IP-based protocols

Address most legacy IP-based use cases with LoRaWAN.

LoRaWAN logo

“IPv6 support is a new milestone for LoRaWAN and the LoRa Alliance. It relies heavily on Acklio’s contributions to the IPv6 Task Force and is now proven on DLMS for smart metering. I want to thank Acklio for their support and contributions to driving the LoRaWAN standard forward.

Donna Moore
CEO at LoRa Alliance

Reference implementation with Acklio SCHC

As specified by the LoRa Alliance, IPv6 operations requires the SCHC adaptation layer for mirroring operations of compression and decompression plus, if required, fragmentation frames, at both the device and the core network.

Pioneer & global leader of SCHC, Acklio offers the reference software to rollout DLMS solutions over LoRaWAN:

Acklio SCHC library

On the device side, SCHC software library can be embedded on the application processor (CPU or MCU) or on the LoRaWAN connectivity module.

Acklio Cloud Platform

On the core network side, the Acklio IP Core platform ensures transparent DLMS communication to the Head-End System and a unified addressing of devices.

What is LoRa and LoRaWAN white paper techniical overview, benfits and use cases

Learn more about the LoRaWAN technology by downloading the Actility “What is LoRaWAN” white paper