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IPv6 over the TSCH mode of IEEE 802.15.4e (6tisch)


 Current Status: Active

     Pascal Thubert 
     Thomas Watteyne 

 Internet Area Directors:
     Erik Kline 
     √Čric Vyncke 

 Internet Area Advisor:
     Erik Kline 

 Mailing Lists:
     General Discussion: 6tisch@ietf.org
     To Subscribe:       https://www.ietf.org/mailman/listinfo/6tisch
     Archive:            https://mailarchive.ietf.org/arch/browse/6tisch/

Description of Working Group:

  6TiSCH: "IPv6 over the TSCH mode of IEEE 802.15.4e".
  Low-power and Lossy Networks (LLNs) interconnect a possibly large number
  of resource-constrained nodes to form a wireless mesh network. The
  6LoWPAN, ROLL and CoRE IETF Working Groups have defined protocols at
  various layers of the protocol stack, including an IPv6 adaptation
  layer, a routing protocol and a web transfer protocol. This protocol
  stack has been used with IEEE802.15.4 low-power radios.
  The Timeslotted Channel Hopping (TSCH) mode was introduced in 2012 as an
  amendment to the Medium Access Control (MAC) portion of the IEEE802.15.4
  standard. TSCH is the emerging standard for industrial automation and
  process control LLNs, with a direct inheritance from WirelessHART and
  ISA100.11a. Defining IPv6 over TSCH, 6TiSCH is a key to enable the
  further adoption of IPv6 in industrial standards and the convergence of
  Operational Technology (OT) with Information Technology (IT).
  The nodes in a IEEE802.15.4 TSCH network communicate by following a
  Time Division Multiple Access (TDMA) schedule. A timeslot in this
  schedule provides a unit of bandwidth that is allocated for
  communication between neighbor nodes. The allocation can be programmed
  such that the predictable transmission pattern matches the traffic. This
  avoids idle listening, and extends battery lifetime for constrained
  nodes. Channel-hopping improves reliability in the presence of narrow-
  band interference and multi-path fading.
  These techniques enable a new range of use cases for LLNs, including:
  - Control loops in a wireless process control network, in which high
  reliability and a fully deterministic behavior are required.
  - Service Provider networks transporting data from different independent
  clients, and for which an operator needs flow isolation and traffic
  - Networks comprising energy harvesting nodes, which require an
  extremely low and predictable average power consumption.
  IEEE802.15.4 only defines the link-layer mechanisms. It does not define
  how the network communication schedule is built and matched to the
  traffic requirements of the network.
  Description of Working Group:
  The Working Group will focus on enabling IPv6 over the TSCH mode of the
  IEEE802.15.4 standard. The extent of the problem space for the WG is
  one or more LLNs, possibly federated through a common backbone link
  via one or more LLN Border Routers (LBRs). The WG will rely on, and if
  necessary extend, existing mechanisms for authenticating LBRs.
  Initially, the WG has limited its scope to distributed routing over a
  static schedule using the Routing Protocol for LLNs (RPL) on the 
  resulting network. This new charter allows for the dynamic allocation of 
  cells and their exchange between adjacent peers to accommodate the 
  available bandwidth to the variations of throughput in IP traffic.
  The WG will continue working on securing the join process and making 
  that fit within the constraints of high latency, low throughput and 
  small frame sizes that characterize IEEE802.15.4 TSCH.
  Additionally, IEEE802.15.4 TSCH being a deterministic MAC, it is 
  envisioned that 6TiSCH will benefit from the work of DetNet WG to 
  establish the so-called deterministic tracks. The group will define the 
  objects and methods that need to be configured, and provide the 
  associated requirements to DetNet.
  The WG will interface with other appropriate groups in the IETF
  Internet, Operations and Management, Routing and Security areas.
  Work Items:
  The group will:
  - Produce a specification of the 6top sublayer that describes the 
  protocol for neighbor nodes to negotiate adding/removing cells. This 
  work will leverage cross participation from IEEE members including the 
  IEEE 6TiSCH Interest Group (IG 6T) to define protocol elements and 
  associated frame formats.
  - Produce a specification for a default 6top Scheduling Function 
  including the policy to enable distributed dynamic scheduling of 
  timeslots for IP traffic. This may include the capability for nodes to 
  appropriate chunks of the matrix without starving, or interfering with 
  other 6TiSCH nodes. This particular work will focus on IP traffic since 
  the work on tracks is not yet advanced enough to specify their 
  - Produce requirements to the DetNet WG, detailing 6TiSCH chunks and 
  tracks, and the data models to manipulate them from an external 
  controller such as a PCE.
  - Produce a specification for a secure 6TiSCH network bootstrap, adapted
  to the constraints of 6TiSCH nodes and leveraging existing art when 
  - Keep updating the "6TiSCH architecture" that describes the design of 
  6TiSCH networks. This document highlights the different architectural
  blocks, signaling and data flows, including the operation of the network 
  in the presence of multiple LBRs. The existing document will be 
  augmented to cover dynamic scheduling and application of the DetNet work 
  but will not be delivered within this round of chartering.
  - Producing YANG Data Models to manage 6tisch is foreseen, but left to a 
  later phase.
  Non-milestone work items:
  The Working Group regularly organizes interoperability events with 
  support from ETSI (i.e., ETSI 6TiSCH Plugtests) to get feedback from 
  implementers early on in the standardization process, and produce better 

Goals and Milestones:
  Oct 2018 - Initial submission of draft-ietf-6tisch-dtsecurity-zerotouch-join to the IESG
  Dec 2018 - Evaluate WG progress, propose new charter to the IESG
  Done     - Second submission of draft-ietf-6tisch-minimal to the IESG
  Done     - WG call to adopt draft-ietf-6tisch-6top-sf0
  Done     - WG call to adopt draft-ietf-6tisch-6top-sublayer
  Done     - ETSI 6TiSCH #3 plugtests
  Done     - Initial submission of draft-ietf-6tisch-6top-protocol to the IESG
  Done     - Initial submission of draft-ietf-6tisch-minimal-security to the IESG
  Done     - Initial submission of 6TiSCH architecture to the IESG
  Done     - 6TiSCH architecture and terminology in RFC publication queue

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